ffplay播放器源码(七)overlay滤镜
本章介绍在mfc-ffplay(源码已删除了所有相关滤镜的代码)播放器增加overlay滤镜在视频里面加logo水印图片，效果图:
滤镜介绍
滤镜（Filters）是FFmpeg库提供的一套强大的工具，滤镜可以应用于视频的每一帧，也可以应用于音频的每一个样本，从而实现各种效果，如缩放、裁剪、旋转视频，调整颜色、对比度、亮度，或者对音频进行混音、延迟、回声等处理。
查看FFmpeg滤镜种类命令:
ffmpeg -filters要查看某滤镜使用详情 ffmpeg -h filter=“滤镜名称”, 如查看overlay滤镜信息:
overlay滤镜是由两输入源合成一个输出源，输入号#0表示主视频源，输入号#1图片/视频帧
实现滤镜方式：
1.用 avfilter_graph_create_filter 一个一个地创建滤镜（AVFilterContext），然后用 avfilter_link 函数把各个滤镜的输入输出连接起来，这种方式比较灵活，但是非常繁琐。
2.定义滤镜字符串，然后给 avfilter_graph_parse2 函数解析，再用avfilter_graph_get_filter()和av_buffersrc_add_frame_flags()函数把各个滤镜的输入输出连接起来,用起来比较最简单的，但获取滤镜名称会让初学者犯晕。
第二种方式使用比较简单 我们先看看 滤镜字符串的定义:
buffer=video_size=1280x720:pix_fmt=0:time_base=1/25:pixel_aspect=0/1:frame_rate=1/25[main];
buffer=video_size=954x542:pix_fmt=14:time_base=1/25:pixel_aspect=0/1:frame_rate=25/1[logo];
[main][logo]overlay=x=300:y=100[result];
[result]format=yuv420p[result_2];
[result_2]buffersink第一行: buffer视频源
第二行: buffer视频源
第三行：[main][logo]overlay=x=300:y=100[result];
Filter overlay
Inputs:
#0: main (video) ->[main]
#1: overlay (video) ->[logo]
Outputs:
#0: default (video) ->[result]
overlay滤镜由 0号输入源[main]和1号输入源 合成 输出源[result]
第四行： [result]format=yuv420p[result_2]; 把[result]视频帧转码成yuv420p格式[result_2]
第五行：[result_2]buffersink,buffersink滤镜的输入源是[result_2]
字符串中";"分号表示结束，滤镜编号从0开始，每增加一个分号结束符，滤镜编号自动加一，以上字符串有五行编号从0到4，编号可以理解为数组下标，“[]”中括号内表示滤镜名称
avfilter_graph_get_filter(filter_graph, "Parsed_buffer_0");// 编号 0，滤镜字符串中 第一行
avfilter_graph_get_filter(filter_graph, "Parsed_buffer_1");// 编号 1，滤镜字符串中 第二行
avfilter_graph_get_filter(filter_graph, "Parsed_buffersink_4");//编号 4，滤镜字符串中 第五行
在mfc-ffplay中实现overlay滤镜
1. 我们在video_thread()视频解码后增加overlay滤镜处理然后增加queue_picture()视频帧队列中
滤镜处理函数： AVFrame* VideoFilter(AVFrame* frame); 返回合成视频帧AVFrame*
static int video_thread(void *arg)
{
frame = VideoFilter(frame);
ret = queue_picture(is, frame, pts, duration, frame->pts, is->viddec.pkt_serial);
av_frame_unref(frame);
}2. 通过ffmpeg库把读取图片视频帧 AVFrame* GetFrameFromFile(const char *filename, AVRational *logo_tb, AVRational *logo_fr)
3. 初始化滤镜容器和设置滤镜功能
3.1 avfilter_graph_alloc()初始化滤镜容器
3.2 AVBPrint与av_bprintf()拼接滤镜字符串，难点
3.3 avfilter_graph_parse2()解析滤镜字符串，调函数走个过场而已
3.4 avfilter_graph_config()打开滤镜，滤镜开始工作
3.5 avfilter_graph_get_filter()查找滤镜名称，avfilter_graph_get_filter(filter_graph, "Parsed_buffer_0");编号0输入源
avfilter_graph_get_filter(filter_graph, "Parsed_buffer_1");编号1输入源
avfilter_graph_get_filter(filter_graph, "Parsed_buffersink_4");//编号4最后sink滤镜源
4. 滤镜输入源接入视频帧数据
av_buffersrc_add_frame_flags(logo_ctx, logo_frame, AV_BUFFERSRC_FLAG_PUSH); 编号1输入源加图片帧，因为只有一张图片,加一次就可以了
av_buffersrc_add_frame_flags(mainsrc_ctx, frame, AV_BUFFERSRC_FLAG_PUSH); 编号0输入源加更新视频帧
5. 从4号滤镜中取出合成视频帧
av_buffersink_get_frame_flags(resultsink_ctx, result_frame, AV_BUFFERSINK_FLAG_NO_REQUEST);
实现滤镜代码 VideoFilter()
AVFilterGraph *filter_graph = NULL;
AVFilterContext *mainsrc_ctx = NULL, *logo_ctx = NULL, *resultsink_ctx = NULL;
AVFrame* VideoFilter(AVFrame* frame)
{
AVFrame *result_frame = av_frame_alloc();
int64_t logo_next_pts = 0, main_next_pts = 0;
int ret = 0;
AVRational logo_tb = { 0 };
AVRational logo_fr = { 0 };
AVFilterInOut *inputs = NULL, *cur = NULL, *outputs = NULL;
// 滤镜设置一次就可以了
if (NULL == filter_graph)
{
AVFrame *logo_frame = GetFrameFromFile("logo.jpg", &logo_tb, &logo_fr);
if (logo_frame == NULL)
{
return frame; ///滤镜处理失败时
}
//初始化滤镜容器
filter_graph = avfilter_graph_alloc();
if (!filter_graph)
{
printf("Error: allocate filter graph failed\n");
return frame;
}
//AVPixelFormat
AVRational tb = { 1,25 };// 简单设置一下
AVRational fr = {1,25};//简单设置一下
AVRational logo_sar = logo_frame->sample_aspect_ratio;
AVRational sar = frame->sample_aspect_ratio;
AVBPrint args;
const char* pixfmt = av_get_pix_fmt_name(frame->format);
av_bprint_init(&args, 0, AV_BPRINT_SIZE_AUTOMATIC);
///拼接滤镜字符串
av_bprintf(&args,
"buffer=video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:pixel_aspect=%d/%d:frame_rate=%d/%d[main];"
"buffer=video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:pixel_aspect=%d/%d:frame_rate=%d/%d[logo];"
"[main][logo]overlay=x=300:y=100[result];"
"[result]format=%s[result_2];"
"[result_2]buffersink",
frame->width, frame->height, frame->format, tb.num, tb.den, sar.num, sar.den, fr.num, fr.den,
logo_frame->width, logo_frame->height, logo_frame->format, logo_tb.num, logo_tb.den,
logo_sar.num, logo_sar.den, logo_fr.num, logo_fr.den, pixfmt);
//解析滤镜字符串，调函数走个过场而已
ret = avfilter_graph_parse2(filter_graph, args.str, &inputs, &outputs);
if (ret < 0)
{
return frame;
}
//正式打开滤镜，开始使用
ret = avfilter_graph_config(filter_graph, NULL);
if (ret < 0)
{
return frame;
}
//根据 名字 找到 AVFilterContext
mainsrc_ctx = avfilter_graph_get_filter(filter_graph, "Parsed_buffer_0");
logo_ctx = avfilter_graph_get_filter(filter_graph, "Parsed_buffer_1");
resultsink_ctx = avfilter_graph_get_filter(filter_graph, "Parsed_buffersink_4");
///编号1输入源加图片帧，因为只有一张图片, 加一次就可以了
ret = av_buffersrc_add_frame_flags(logo_ctx, logo_frame, AV_BUFFERSRC_FLAG_PUSH);
if (ret < 0)
{
return frame;
}
logo_next_pts = logo_frame->pts + logo_frame->pkt_duration;
ret = av_buffersrc_close(logo_ctx, logo_next_pts, AV_BUFFERSRC_FLAG_PUSH);
av_frame_unref(logo_frame);
}
//编号0输入源加更新视频帧
ret = av_buffersrc_add_frame_flags(mainsrc_ctx, frame, AV_BUFFERSRC_FLAG_PUSH);
if (ret < 0)
{
return frame;
}
//从4号滤镜中取出合成视频帧
ret = av_buffersink_get_frame_flags(resultsink_ctx, result_frame, AV_BUFFERSINK_FLAG_NO_REQUEST);
if (ret < 0)
{
return frame;
}
av_frame_unref(frame);
return result_frame;
}
为了方便学习滤镜所以删除了原本滤镜相关代码,滤镜有很多种学者自研究其用法，关于ffplay内容到里就全部结束，增加滤镜后完整代码ffplay.c
/* Copyright (c) 2003 Fabrice Bellard
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* simple media player based on the FFmpeg libraries
*/
#include
#include "config.h"
#include "config_components.h"
#include
#include
#include
#include
#include
#include "libavutil/avstring.h"
#include "libavutil/channel_layout.h"
#include "libavutil/eval.h"
#include "libavutil/mathematics.h"
#include "libavutil/pixdesc.h"
#include "libavutil/imgutils.h"
#include "libavutil/dict.h"
#include "libavutil/fifo.h"
#include "libavutil/parseutils.h"
#include "libavutil/samplefmt.h"
#include "libavutil/time.h"
#include "libavutil/bprint.h"
#include "libavformat/avformat.h"
#include "libavdevice/avdevice.h"
#include "libswscale/swscale.h"
#include "libavutil/opt.h"
#include "libavcodec/avfft.h"
#include "libswresample/swresample.h"
#include "libavfilter/avfilter.h"
#include "libavfilter/buffersink.h"
#include "libavfilter/buffersrc.h"
#include "libavcodec/avcodec.h"
#include "libavcodec/bsf.h"
#include "libavcodec/codec.h"
#include "libavcodec/codec_desc.h"
#include "libavcodec/version.h"
#include
#include
#include "cmdutils.h"
#pragma comment(lib,"avcodec.lib")
#pragma comment(lib,"avdevice.lib")
#pragma comment(lib,"avfilter.lib")
#pragma comment(lib,"avformat.lib")
#pragma comment(lib,"avutil.lib")
#pragma comment(lib,"swscale.lib")
#pragma comment(lib,"swresample.lib")
#include
#pragma comment(lib,"SDL2.lib")
//#define av_log(avcl, level, fmt, ...) av_log4(avcl,level,fmt)
const char program_name[] = "ffplay";
const int program_birth_year = 2003;
#define MAX_QUEUE_SIZE (15 * 1024 * 1024)
#define MIN_FRAMES 25
#define EXTERNAL_CLOCK_MIN_FRAMES 2
#define EXTERNAL_CLOCK_MAX_FRAMES 10
/* Minimum SDL audio buffer size, in samples. */
#define SDL_AUDIO_MIN_BUFFER_SIZE 512
/* Calculate actual buffer size keeping in mind not cause too frequent audio callbacks */
#define SDL_AUDIO_MAX_CALLBACKS_PER_SEC 30
/* Step size for volume control in dB */
#define SDL_VOLUME_STEP (0.75)
/* no AV sync correction is done if below the minimum AV sync threshold */
#define AV_SYNC_THRESHOLD_MIN 0.04
/* AV sync correction is done if above the maximum AV sync threshold */
#define AV_SYNC_THRESHOLD_MAX 0.1
/* If a frame duration is longer than this, it will not be duplicated to compensate AV sync */
#define AV_SYNC_FRAMEDUP_THRESHOLD 0.1
/* no AV correction is done if too big error */
#define AV_NOSYNC_THRESHOLD 10.0
/* maximum audio speed change to get correct sync */
#define SAMPLE_CORRECTION_PERCENT_MAX 10
/* external clock speed adjustment constants for realtime sources based on buffer fullness */
#define EXTERNAL_CLOCK_SPEED_MIN 0.900
#define EXTERNAL_CLOCK_SPEED_MAX 1.010
#define EXTERNAL_CLOCK_SPEED_STEP 0.001
/* we use about AUDIO_DIFF_AVG_NB A-V differences to make the average */
#define AUDIO_DIFF_AVG_NB 20
/* polls for possible required screen refresh at least this often, should be less than 1/fps */
#define REFRESH_RATE 0.01
/* NOTE: the size must be big enough to compensate the hardware audio buffersize size */
/* TODO: We assume that a decoded and resampled frame fits into this buffer */
#define SAMPLE_ARRAY_SIZE (8 * 65536)
#define CURSOR_HIDE_DELAY 1000000
#define USE_ONEPASS_SUBTITLE_RENDER 1
typedef struct MyAVPacketList {
AVPacket *pkt;
int serial;
} MyAVPacketList;
typedef struct PacketQueue {
AVFifo *pkt_list;
int nb_packets;
int size;
int64_t duration;
int abort_request;
int serial;
SDL_mutex *mutex;
SDL_cond *cond;
} PacketQueue;
#define VIDEO_PICTURE_QUEUE_SIZE 3
#define SUBPICTURE_QUEUE_SIZE 16
#define SAMPLE_QUEUE_SIZE 9
#define FRAME_QUEUE_SIZE FFMAX(SAMPLE_QUEUE_SIZE, FFMAX(VIDEO_PICTURE_QUEUE_SIZE, SUBPICTURE_QUEUE_SIZE))
typedef struct AudioParams {
int freq;
AVChannelLayout ch_layout;
enum AVSampleFormat fmt;
int frame_size;
int bytes_per_sec;
} AudioParams;
typedef struct Clock {
double pts; /* clock base */
double pts_drift; /* clock base minus time at which we updated the clock */
double last_updated;
double speed;
int serial; /* clock is based on a packet with this serial */
int paused;
int *queue_serial; /* pointer to the current packet queue serial, used for obsolete clock detection */
} Clock;
typedef struct FrameData {
int64_t pkt_pos;
} FrameData;
/* Common struct for handling all types of decoded data and allocated render buffers. */
typedef struct Frame {
AVFrame *frame;
AVSubtitle sub;
int serial;
double pts; /* presentation timestamp for the frame */
double duration; /* estimated duration of the frame */
int64_t pos; /* byte position of the frame in the input file */
int width;
int height;
int format;
AVRational sar;
int uploaded;
int flip_v;
} Frame;
typedef struct FrameQueue {
Frame queue[FRAME_QUEUE_SIZE];
int rindex;
int windex;
int size;
int max_size;
int keep_last;
int rindex_shown;
SDL_mutex *mutex;
SDL_cond *cond;
PacketQueue *pktq;
} FrameQueue;
enum {
AV_SYNC_AUDIO_MASTER, /* default choice */
AV_SYNC_VIDEO_MASTER,
AV_SYNC_EXTERNAL_CLOCK, /* synchronize to an external clock */
};
typedef struct Decoder {
AVPacket *pkt;
PacketQueue *queue;
AVCodecContext *avctx;
int pkt_serial;
int finished;
int packet_pending;
SDL_cond *empty_queue_cond;
int64_t start_pts;
AVRational start_pts_tb;
int64_t next_pts;
AVRational next_pts_tb;
SDL_Thread *decoder_tid;
} Decoder;
typedef struct VideoState
{
SDL_Thread *read_tid;
const AVInputFormat *iformat;
int abort_request;
int force_refresh;
int paused;
int last_paused;
int queue_attachments_req; //带有专辑封面的，加载完显示，不一定是第一帧
int seek_req;
int seek_flags;
int64_t seek_pos;
int64_t seek_rel;
int read_pause_return;
AVFormatContext *ic;
int realtime;// 是否是直播视频
Clock audclk;
Clock vidclk;
Clock extclk;
FrameQueue pictq;
FrameQueue subpq;
FrameQueue sampq;
Decoder auddec;
Decoder viddec;
Decoder subdec;
int audio_stream;
int av_sync_type;
double audio_clock;
int audio_clock_serial;
double audio_diff_cum; /* used for AV difference average computation */
double audio_diff_avg_coef;
double audio_diff_threshold;
int audio_diff_avg_count;
AVStream *audio_st;
PacketQueue audioq;
int audio_hw_buf_size;
uint8_t *audio_buf;
uint8_t *audio_buf1;
unsigned int audio_buf_size; /* in bytes */
unsigned int audio_buf1_size;
int audio_buf_index; /* in bytes */
int audio_write_buf_size;
int audio_volume;
int muted;
struct AudioParams audio_src;
struct AudioParams audio_tgt;
struct SwrContext *swr_ctx;
int frame_drops_early;
int frame_drops_late;
enum ShowMode
{
SHOW_MODE_NONE = -1,
SHOW_MODE_VIDEO = 0,
SHOW_MODE_WAVES,
SHOW_MODE_RDFT,
SHOW_MODE_NB
} show_mode;
int16_t sample_array[SAMPLE_ARRAY_SIZE];
int sample_array_index;
int last_i_start;
RDFTContext *rdft;
int rdft_bits;
FFTSample *rdft_data;
int xpos;
double last_vis_time;
SDL_Texture *vis_texture;
SDL_Texture *sub_texture;
SDL_Texture *vid_texture;
int subtitle_stream;
AVStream *subtitle_st;
PacketQueue subtitleq;
double frame_timer; // 记录了 上一个视频帧显示时间 av_gettime_relative()
double frame_last_returned_time;
double frame_last_filter_delay;
int video_stream;
AVStream *video_st;
PacketQueue videoq;
double max_frame_duration; // maximum duration of a frame - above this, we consider the jump a timestamp discontinuity
struct SwsContext *sub_convert_ctx;
int eof;
char *filename;
int width, height, xleft, ytop;
int step;
int last_video_stream, last_audio_stream, last_subtitle_stream;
SDL_cond *continue_read_thread;
} VideoState;
/* options specified by the user */
static const AVInputFormat *file_iformat;
static const char *input_filename;
static const char *window_title;
static int default_width = 640;
static int default_height = 480;
static int screen_width = 0;
static int screen_height = 0;
static int screen_left = SDL_WINDOWPOS_CENTERED;
static int screen_top = SDL_WINDOWPOS_CENTERED;
static int audio_disable;
static int video_disable;
static int subtitle_disable;
static const char* wanted_stream_spec[AVMEDIA_TYPE_NB] = { 0 };
static int seek_by_bytes = -1;
static float seek_interval = 10;
static int display_disable;
static int borderless;
static int alwaysontop;
static int startup_volume = 100;
static int show_status = -1;
static int av_sync_type = AV_SYNC_AUDIO_MASTER;
static int fast = 0;
static int genpts = 0;
static int lowres = 0;
static int decoder_reorder_pts = -1;
static int autoexit;
static int exit_on_keydown;
static int exit_on_mousedown;
static int framedrop = -1;
static int infinite_buffer = -1;
static enum ShowMode show_mode = SHOW_MODE_NONE;
double rdftspeed = 0.02;
static int64_t cursor_last_shown;
static int cursor_hidden = 0;
static const char **vfilters_list = NULL;
static int nb_vfilters = 0;
static char *afilters = NULL;
static int autorotate = 1;
static int find_stream_info = 1;
static int filter_nbthreads = 0;
/* current context */
static int is_full_screen;
static int64_t audio_callback_time;
#define FF_QUIT_EVENT (SDL_USEREVENT + 2)
static SDL_Window *window;
static SDL_Renderer *renderer;
static SDL_RendererInfo renderer_info = { 0 };
static SDL_AudioDeviceID audio_dev;
static const struct TextureFormatEntry
{
enum AVPixelFormat format;
int texture_fmt;
}
sdl_texture_format_map[] =
{
{ AV_PIX_FMT_RGB8, SDL_PIXELFORMAT_RGB332 },
{ AV_PIX_FMT_RGB444, SDL_PIXELFORMAT_RGB444 },
{ AV_PIX_FMT_RGB555, SDL_PIXELFORMAT_RGB555 },
{ AV_PIX_FMT_BGR555, SDL_PIXELFORMAT_BGR555 },
{ AV_PIX_FMT_RGB565, SDL_PIXELFORMAT_RGB565 },
{ AV_PIX_FMT_BGR565, SDL_PIXELFORMAT_BGR565 },
{ AV_PIX_FMT_RGB24, SDL_PIXELFORMAT_RGB24 },
{ AV_PIX_FMT_BGR24, SDL_PIXELFORMAT_BGR24 },
{ AV_PIX_FMT_0RGB32, SDL_PIXELFORMAT_RGB888 },
{ AV_PIX_FMT_0BGR32, SDL_PIXELFORMAT_BGR888 },
{ AV_PIX_FMT_NE(RGB0, 0BGR), SDL_PIXELFORMAT_RGBX8888 },
{ AV_PIX_FMT_NE(BGR0, 0RGB), SDL_PIXELFORMAT_BGRX8888 },
{ AV_PIX_FMT_RGB32, SDL_PIXELFORMAT_ARGB8888 },
{ AV_PIX_FMT_RGB32_1, SDL_PIXELFORMAT_RGBA8888 },
{ AV_PIX_FMT_BGR32, SDL_PIXELFORMAT_ABGR8888 },
{ AV_PIX_FMT_BGR32_1, SDL_PIXELFORMAT_BGRA8888 },
{ AV_PIX_FMT_YUV420P, SDL_PIXELFORMAT_IYUV },
{ AV_PIX_FMT_YUYV422, SDL_PIXELFORMAT_YUY2 },
{ AV_PIX_FMT_UYVY422, SDL_PIXELFORMAT_UYVY },
{ AV_PIX_FMT_NONE, SDL_PIXELFORMAT_UNKNOWN },
};
void init_dynload(void)
{
#if HAVE_SETDLLDIRECTORY && defined(_WIN32)
/* Calling SetDllDirectory with the empty string (but not NULL) removes the
* current working directory from the DLL search path as a security pre-caution. */
SetDllDirectory("");
#endif
}
static inline
int cmp_audio_fmts(enum AVSampleFormat fmt1, int64_t channel_count1,
enum AVSampleFormat fmt2, int64_t channel_count2)
{
/* If channel count == 1, planar and non-planar formats are the same */
if (channel_count1 == 1 && channel_count2 == 1)
return av_get_packed_sample_fmt(fmt1) != av_get_packed_sample_fmt(fmt2);
else
return channel_count1 != channel_count2 || fmt1 != fmt2;
}
static int packet_queue_put_private(PacketQueue *q, AVPacket *pkt)
{
MyAVPacketList pkt1;
int ret;
if (q->abort_request)
return -1;
pkt1.pkt = pkt;
pkt1.serial = q->serial;
ret = av_fifo_write(q->pkt_list, &pkt1, 1);
if (ret < 0)
return ret;
q->nb_packets++;
q->size += pkt1.pkt->size + sizeof(pkt1);
q->duration += pkt1.pkt->duration;
/* XXX: should duplicate packet data in DV case */
SDL_CondSignal(q->cond);
return 0;
}
static int packet_queue_put(PacketQueue *q, AVPacket *pkt)
{
AVPacket *pkt1;
int ret;
pkt1 = av_packet_alloc();
if (!pkt1) {
av_packet_unref(pkt);
return -1;
}
av_packet_move_ref(pkt1, pkt);
SDL_LockMutex(q->mutex);
ret = packet_queue_put_private(q, pkt1);
SDL_UnlockMutex(q->mutex);
if (ret < 0)
av_packet_free(&pkt1);
return ret;
}
static int packet_queue_put_nullpacket(PacketQueue *q, AVPacket *pkt, int stream_index)
{
pkt->stream_index = stream_index;
return packet_queue_put(q, pkt);
}
/* packet queue handling */
static int packet_queue_init(PacketQueue *q)
{
memset(q, 0, sizeof(PacketQueue));
q->pkt_list = av_fifo_alloc2(1, sizeof(MyAVPacketList), AV_FIFO_FLAG_AUTO_GROW);
if (!q->pkt_list)
return AVERROR(ENOMEM);
q->mutex = SDL_CreateMutex();
if (!q->mutex)
{
return AVERROR(ENOMEM);
}
q->cond = SDL_CreateCond();
if (!q->cond)
{
return AVERROR(ENOMEM);
}
q->abort_request = 1;
return 0;
}
static void packet_queue_flush(PacketQueue *q)
{
MyAVPacketList pkt1;
SDL_LockMutex(q->mutex);
while (av_fifo_read(q->pkt_list, &pkt1, 1) >= 0)
av_packet_free(&pkt1.pkt);
q->nb_packets = 0;
q->size = 0;
q->duration = 0;
q->serial++;
SDL_UnlockMutex(q->mutex);
}
static void packet_queue_destroy(PacketQueue *q)
{
packet_queue_flush(q);
av_fifo_freep2(&q->pkt_list);
SDL_DestroyMutex(q->mutex);
SDL_DestroyCond(q->cond);
}
static void packet_queue_abort(PacketQueue *q)
{
SDL_LockMutex(q->mutex);
q->abort_request = 1;
SDL_CondSignal(q->cond);
SDL_UnlockMutex(q->mutex);
}
static void packet_queue_start(PacketQueue *q)
{
SDL_LockMutex(q->mutex);
q->abort_request = 0;
q->serial++;
SDL_UnlockMutex(q->mutex);
}
/* return < 0 if aborted, 0 if no packet and > 0 if packet. */
static int packet_queue_get(PacketQueue *q, AVPacket *pkt, int block, int *serial)
{
MyAVPacketList pkt1;
int ret;
SDL_LockMutex(q->mutex);
for (;;)
{
if (q->abort_request)
{
ret = -1;
break;
}
if (av_fifo_read(q->pkt_list, &pkt1, 1) >= 0)
{
q->nb_packets--;
q->size -= pkt1.pkt->size + sizeof(pkt1);
q->duration -= pkt1.pkt->duration;
av_packet_move_ref(pkt, pkt1.pkt);
if (serial)
*serial = pkt1.serial;
av_packet_free(&pkt1.pkt);
ret = 1;
break;
}
else if (!block)
{
ret = 0;
break;
}
else
{
SDL_CondWait(q->cond, q->mutex);
}
}
SDL_UnlockMutex(q->mutex);
return ret;
}
static int decoder_init(Decoder *d, AVCodecContext *avctx, PacketQueue *queue, SDL_cond *empty_queue_cond) {
memset(d, 0, sizeof(Decoder));
d->pkt = av_packet_alloc();
if (!d->pkt)
return AVERROR(ENOMEM);
d->avctx = avctx;
d->queue = queue;
d->empty_queue_cond = empty_queue_cond;
d->start_pts = AV_NOPTS_VALUE;
d->pkt_serial = -1;
return 0;
}
static int decoder_decode_frame(Decoder *d, AVFrame *frame, AVSubtitle *sub)
{
int ret = AVERROR(EAGAIN);
for (;;)
{
if (d->queue->serial == d->pkt_serial)
{
do
{
if (d->queue->abort_request)
{
return -1;
}
switch (d->avctx->codec_type)
{
case AVMEDIA_TYPE_VIDEO:
ret = avcodec_receive_frame(d->avctx, frame);
if (ret >= 0)
{
if (decoder_reorder_pts == -1)
{
frame->pts = frame->best_effort_timestamp;
}
else if (!decoder_reorder_pts)
{
frame->pts = frame->pkt_dts;
}
}
break;
case AVMEDIA_TYPE_AUDIO:
ret = avcodec_receive_frame(d->avctx, frame);
if (ret >= 0)
{
AVRational tb = (AVRational) { 1, frame->sample_rate };
if (frame->pts != AV_NOPTS_VALUE)
{
frame->pts = av_rescale_q(frame->pts, d->avctx->pkt_timebase, tb);
}
else if (d->next_pts != AV_NOPTS_VALUE)
{
frame->pts = av_rescale_q(d->next_pts, d->next_pts_tb, tb);
}
if (frame->pts != AV_NOPTS_VALUE)
{
d->next_pts = frame->pts + frame->nb_samples;
d->next_pts_tb = tb;
}
}
break;
}
if (ret == AVERROR_EOF)
{
d->finished = d->pkt_serial;
avcodec_flush_buffers(d->avctx);
return 0;
}
if (ret >= 0)
return 1;
} while (ret != AVERROR(EAGAIN));
}
do
{
if (d->queue->nb_packets == 0)
SDL_CondSignal(d->empty_queue_cond);
if (d->packet_pending)
{
d->packet_pending = 0;
}
else
{
int old_serial = d->pkt_serial;
if (packet_queue_get(d->queue, d->pkt, 1, &d->pkt_serial) < 0)
return -1;
if (old_serial != d->pkt_serial)
{
avcodec_flush_buffers(d->avctx);
d->finished = 0;
d->next_pts = d->start_pts;
d->next_pts_tb = d->start_pts_tb;
}
}
if (d->queue->serial == d->pkt_serial)
break;
av_packet_unref(d->pkt);
} while (1);
if (d->avctx->codec_type == AVMEDIA_TYPE_SUBTITLE)
{
int got_frame = 0;
ret = avcodec_decode_subtitle2(d->avctx, sub, &got_frame, d->pkt);
if (ret < 0)
{
ret = AVERROR(EAGAIN);
}
else
{
if (got_frame && !d->pkt->data)
{
d->packet_pending = 1;
}
ret = got_frame ? 0 : (d->pkt->data ? AVERROR(EAGAIN) : AVERROR_EOF);
}
av_packet_unref(d->pkt);
}
else
{
if (d->pkt->buf && !d->pkt->opaque_ref)
{
FrameData *fd;
d->pkt->opaque_ref = av_buffer_allocz(sizeof(*fd));
if (!d->pkt->opaque_ref)
return AVERROR(ENOMEM);
fd = (FrameData*)d->pkt->opaque_ref->data;
fd->pkt_pos = d->pkt->pos;
}
if (avcodec_send_packet(d->avctx, d->pkt) == AVERROR(EAGAIN))
{
d->packet_pending = 1;
}
else
{
av_packet_unref(d->pkt);
}
}
}
}
static void decoder_destroy(Decoder *d)
{
av_packet_free(&d->pkt);
avcodec_free_context(&d->avctx);
}
static void frame_queue_unref_item(Frame *vp)
{
av_frame_unref(vp->frame);
avsubtitle_free(&vp->sub);
}
static int frame_queue_init(FrameQueue *f, PacketQueue *pktq, int max_size, int keep_last)
{
int i;
memset(f, 0, sizeof(FrameQueue));
if (!(f->mutex = SDL_CreateMutex())) {
return AVERROR(ENOMEM);
}
if (!(f->cond = SDL_CreateCond())) {
return AVERROR(ENOMEM);
}
f->pktq = pktq;
f->max_size = FFMIN(max_size, FRAME_QUEUE_SIZE);
f->keep_last = !!keep_last;
for (i = 0; i < f->max_size; i++)
if (!(f->queue[i].frame = av_frame_alloc()))
return AVERROR(ENOMEM);
return 0;
}
static void frame_queue_destory(FrameQueue *f)
{
int i;
for (i = 0; i < f->max_size; i++)
{
Frame *vp = &f->queue[i];
frame_queue_unref_item(vp);
av_frame_free(&vp->frame);
}
SDL_DestroyMutex(f->mutex);
SDL_DestroyCond(f->cond);
}
static void frame_queue_signal(FrameQueue *f)
{
SDL_LockMutex(f->mutex);
SDL_CondSignal(f->cond);
SDL_UnlockMutex(f->mutex);
}
static Frame *frame_queue_peek(FrameQueue *f)
{
return &f->queue[(f->rindex + f->rindex_shown) % f->max_size];
}
static Frame *frame_queue_peek_next(FrameQueue *f)
{
return &f->queue[(f->rindex + f->rindex_shown + 1) % f->max_size];
}
static Frame *frame_queue_peek_last(FrameQueue *f)
{
return &f->queue[f->rindex];
}
static Frame *frame_queue_peek_writable(FrameQueue *f)
{
/* wait until we have space to put a new frame */
SDL_LockMutex(f->mutex);
while (f->size >= f->max_size && !f->pktq->abort_request)
{
SDL_CondWait(f->cond, f->mutex);
}
SDL_UnlockMutex(f->mutex);
if (f->pktq->abort_request)
return NULL;
return &f->queue[f->windex];
}
static Frame *frame_queue_peek_readable(FrameQueue *f)
{
/* wait until we have a readable a new frame */
SDL_LockMutex(f->mutex);
while (f->size - f->rindex_shown <= 0 && !f->pktq->abort_request)
{
SDL_CondWait(f->cond, f->mutex);
}
SDL_UnlockMutex(f->mutex);
if (f->pktq->abort_request)
return NULL;
return &f->queue[(f->rindex + f->rindex_shown) % f->max_size];
}
static void frame_queue_push(FrameQueue *f)
{
if (++f->windex == f->max_size)
f->windex = 0;
SDL_LockMutex(f->mutex);
f->size++;
SDL_CondSignal(f->cond);
SDL_UnlockMutex(f->mutex);
}
static void frame_queue_next(FrameQueue *f)
{
if (f->keep_last && !f->rindex_shown)
{
f->rindex_shown = 1;
return;
}
frame_queue_unref_item(&f->queue[f->rindex]);
if (++f->rindex == f->max_size)
f->rindex = 0;
SDL_LockMutex(f->mutex);
f->size--;
SDL_CondSignal(f->cond);
SDL_UnlockMutex(f->mutex);
}
/* return the number of undisplayed frames in the queue */
static int frame_queue_nb_remaining(FrameQueue *f)
{
return f->size - f->rindex_shown;
}
/* return last shown position */
static int64_t frame_queue_last_pos(FrameQueue *f)
{
Frame *fp = &f->queue[f->rindex];
if (f->rindex_shown && fp->serial == f->pktq->serial)
return fp->pos;
else
return -1;
}
static void decoder_abort(Decoder *d, FrameQueue *fq)
{
packet_queue_abort(d->queue);
frame_queue_signal(fq);
SDL_WaitThread(d->decoder_tid, NULL);
d->decoder_tid = NULL;
packet_queue_flush(d->queue);
}
static inline void fill_rectangle(int x, int y, int w, int h)
{
SDL_Rect rect;
rect.x = x;
rect.y = y;
rect.w = w;
rect.h = h;
if (w && h)
SDL_RenderFillRect(renderer, &rect);
}
/** 重新分配纹理realloc_texture()
1. 没有纹理时 -> 创建纹理
2. 查询纹理信息失败时 ->创建纹理
3. 视频帧数据(宽\高\格式)更变时 -> 创建纹理
**/
static int realloc_texture(SDL_Texture **texture, Uint32 new_format, int new_width, int new_height, SDL_BlendMode blendmode, int init_texture)
{
Uint32 format;
int access, w, h;
//SDL_QueryTexture 查询纹理信息
if (!*texture || SDL_QueryTexture(*texture, &format, &access, &w, &h) < 0 || new_width != w || new_height != h || new_format != format)
{
void *pixels;
int pitch;
if (*texture)
{
// 释放纹理
SDL_DestroyTexture(*texture);
}
// 创建纹理
if (!(*texture = SDL_CreateTexture(renderer, new_format, SDL_TEXTUREACCESS_STREAMING, new_width, new_height)))
{
return -1;
}
//设置 混合模式
if (SDL_SetTextureBlendMode(*texture, blendmode) < 0)
{
return -1;
}
if (init_texture)
{
if (SDL_LockTexture(*texture, NULL, &pixels, &pitch) < 0)
{
return -1;
}
// 初始化 清空纹理内容
memset(pixels, 0, pitch * new_height);
SDL_UnlockTexture(*texture);
}
}
return 0;
}
static void calculate_display_rect(SDL_Rect *rect,
int scr_xleft, int scr_ytop, int scr_width, int scr_height,
int pic_width, int pic_height, AVRational pic_sar)
{
AVRational aspect_ratio = pic_sar;
int64_t width, height, x, y;
if (av_cmp_q(aspect_ratio, av_make_q(0, 1)) <= 0)
{
aspect_ratio = av_make_q(1, 1);
}
aspect_ratio = av_mul_q(aspect_ratio, av_make_q(pic_width, pic_height));
/* XXX: we suppose the screen has a 1.0 pixel ratio */
height = scr_height;
width = av_rescale(height, aspect_ratio.num, aspect_ratio.den) & ~1;
if (width > scr_width)
{
width = scr_width;
height = av_rescale(width, aspect_ratio.den, aspect_ratio.num) & ~1;
}
x = (scr_width - width) / 2;
y = (scr_height - height) / 2;
rect->x = scr_xleft + x;
rect->y = scr_ytop + y;
rect->w = FFMAX((int)width, 1);
rect->h = FFMAX((int)height, 1);
}
static void get_sdl_pix_fmt_and_blendmode(int format, Uint32 *sdl_pix_fmt, SDL_BlendMode *sdl_blendmode)
{
int i;
*sdl_blendmode = SDL_BLENDMODE_NONE;
*sdl_pix_fmt = SDL_PIXELFORMAT_UNKNOWN;
if (format == AV_PIX_FMT_RGB32 ||
format == AV_PIX_FMT_RGB32_1 ||
format == AV_PIX_FMT_BGR32 ||
format == AV_PIX_FMT_BGR32_1)
{
// 这几个支持 混合模式
*sdl_blendmode = SDL_BLENDMODE_BLEND;
}
for (i = 0; i < FF_ARRAY_ELEMS(sdl_texture_format_map) - 1; i++)
{
if (format == sdl_texture_format_map[i].format)
{
*sdl_pix_fmt = sdl_texture_format_map[i].texture_fmt;
return;
}
}
}
static int upload_texture(SDL_Texture **tex, AVFrame *frame)
{
int ret = 0;
Uint32 sdl_pix_fmt;
SDL_BlendMode sdl_blendmode;
//通过视频帧格式 查找 支持SDL纹理格式与混合模式
//sdl_pix_fmt 如果没有找到 纹理格式用SDL_PIXELFORMAT_ARGB8888，
// sdl_blendmode：默认不用混合模式
get_sdl_pix_fmt_and_blendmode(frame->format, &sdl_pix_fmt, &sdl_blendmode);
//创建纹理
if (realloc_texture(tex, sdl_pix_fmt == SDL_PIXELFORMAT_UNKNOWN ? SDL_PIXELFORMAT_ARGB8888 : sdl_pix_fmt, frame->width, frame->height, sdl_blendmode, 0) < 0)
{
return -1;
}
switch (sdl_pix_fmt)
{
case SDL_PIXELFORMAT_IYUV:
if (frame->linesize[0] > 0 && frame->linesize[1] > 0 && frame->linesize[2] > 0)
{
//更新纹理内容
ret = SDL_UpdateYUVTexture(*tex, NULL, frame->data[0], frame->linesize[0],
frame->data[1], frame->linesize[1],
frame->data[2], frame->linesize[2]);
}
else if (frame->linesize[0] < 0 && frame->linesize[1] < 0 && frame->linesize[2] < 0)
{
//更新纹理内容
ret = SDL_UpdateYUVTexture(*tex, NULL, frame->data[0] + frame->linesize[0] * (frame->height - 1), -frame->linesize[0],
frame->data[1] + frame->linesize[1] * (AV_CEIL_RSHIFT(frame->height, 1) - 1), -frame->linesize[1],
frame->data[2] + frame->linesize[2] * (AV_CEIL_RSHIFT(frame->height, 1) - 1), -frame->linesize[2]);
}
else
{
return -1;
}
break;
default:
if (frame->linesize[0] < 0)
{
//更新纹理内容
ret = SDL_UpdateTexture(*tex, NULL, frame->data[0] + frame->linesize[0] * (frame->height - 1), -frame->linesize[0]);
}
else {
//更新纹理内容
ret = SDL_UpdateTexture(*tex, NULL, frame->data[0], frame->linesize[0]);
}
break;
}
return ret;
}
static void set_sdl_yuv_conversion_mode(AVFrame *frame)
{
#if SDL_VERSION_ATLEAST(2,0,8)
SDL_YUV_CONVERSION_MODE mode = SDL_YUV_CONVERSION_AUTOMATIC;//默认 自动模式
if (frame && (frame->format == AV_PIX_FMT_YUV420P || frame->format == AV_PIX_FMT_YUYV422 || frame->format == AV_PIX_FMT_UYVY422))
{
if (frame->color_range == AVCOL_RANGE_JPEG)
{
mode = SDL_YUV_CONVERSION_JPEG;
}
else if (frame->colorspace == AVCOL_SPC_BT709)
{
mode = SDL_YUV_CONVERSION_BT709;
}
else if (frame->colorspace == AVCOL_SPC_BT470BG || frame->colorspace == AVCOL_SPC_SMPTE170M)
{
mode = SDL_YUV_CONVERSION_BT601;
}
}
SDL_SetYUVConversionMode(mode); //设置YUV转换模式
#endif
}
static void video_image_display(VideoState *is)
{
Frame *vp;
Frame *sp = NULL;
SDL_Rect rect;
vp = frame_queue_peek_last(&is->pictq);
if (is->subtitle_st)
{
if (frame_queue_nb_remaining(&is->subpq) > 0)
{
sp = frame_queue_peek(&is->subpq);
if (vp->pts >= sp->pts + ((float)sp->sub.start_display_time / 1000))
{
if (!sp->uploaded)
{
uint8_t* pixels[4];
int pitch[4];
int i;
if (!sp->width || !sp->height)
{
sp->width = vp->width;
sp->height = vp->height;
}
if (realloc_texture(&is->sub_texture, SDL_PIXELFORMAT_ARGB8888, sp->width, sp->height, SDL_BLENDMODE_BLEND, 1) < 0)
return;
for (i = 0; i < sp->sub.num_rects; i++)
{
AVSubtitleRect *sub_rect = sp->sub.rects[i];
sub_rect->x = av_clip(sub_rect->x, 0, sp->width);
sub_rect->y = av_clip(sub_rect->y, 0, sp->height);
sub_rect->w = av_clip(sub_rect->w, 0, sp->width - sub_rect->x);
sub_rect->h = av_clip(sub_rect->h, 0, sp->height - sub_rect->y);
is->sub_convert_ctx = sws_getCachedContext(is->sub_convert_ctx,
sub_rect->w, sub_rect->h, AV_PIX_FMT_PAL8,
sub_rect->w, sub_rect->h, AV_PIX_FMT_BGRA,
0, NULL, NULL, NULL);
if (!is->sub_convert_ctx)
{
return;
}
if (!SDL_LockTexture(is->sub_texture, (SDL_Rect *)sub_rect, (void **)pixels, pitch))
{
sws_scale(is->sub_convert_ctx, (const uint8_t * const *)sub_rect->data, sub_rect->linesize,
0, sub_rect->h, pixels, pitch);
SDL_UnlockTexture(is->sub_texture);
}
}
sp->uploaded = 1;
}
}
else
sp = NULL;
}
}
calculate_display_rect(&rect, is->xleft, is->ytop, is->width, is->height, vp->width, vp->height, vp->sar);
set_sdl_yuv_conversion_mode(vp->frame);
if (!vp->uploaded)
{
if (upload_texture(&is->vid_texture, vp->frame) < 0)
{
set_sdl_yuv_conversion_mode(NULL);
return;
}
vp->uploaded = 1;
vp->flip_v = vp->frame->linesize[0] < 0;
}
SDL_RenderCopyEx(renderer, is->vid_texture, NULL, &rect, 0, NULL, vp->flip_v ? SDL_FLIP_VERTICAL : 0);
set_sdl_yuv_conversion_mode(NULL);
if (sp)
{
#if USE_ONEPASS_SUBTITLE_RENDER
SDL_RenderCopy(renderer, is->sub_texture, NULL, &rect);
#else
int i;
double xratio = (double)rect.w / (double)sp->width;
double yratio = (double)rect.h / (double)sp->height;
for (i = 0; i < sp->sub.num_rects; i++) {
SDL_Rect *sub_rect = (SDL_Rect*)sp->sub.rects[i];
SDL_Rect target = { .x = rect.x + sub_rect->x * xratio,
.y = rect.y + sub_rect->y * yratio,
.w = sub_rect->w * xratio,
.h = sub_rect->h * yratio };
SDL_RenderCopy(renderer, is->sub_texture, sub_rect, &target);
}
#endif
}
}
static inline int compute_mod(int a, int b)
{
return a < 0 ? a % b + b : a % b;
}
static void video_audio_display(VideoState *s)
{
int i, i_start, x, y1, y, ys, delay, n, nb_display_channels;
int ch, channels, h, h2;
int64_t time_diff;
int rdft_bits, nb_freq;
for (rdft_bits = 1; (1 << rdft_bits) < 2 * s->height; rdft_bits++);
nb_freq = 1 << (rdft_bits - 1);
/* compute display index : center on currently output samples */
channels = s->audio_tgt.ch_layout.nb_channels;
nb_display_channels = channels;
if (!s->paused)
{
int data_used = s->show_mode == SHOW_MODE_WAVES ? s->width : (2 * nb_freq);
n = 2 * channels;
delay = s->audio_write_buf_size;
delay /= n;
/* to be more precise, we take into account the time spent since
the last buffer computation */
if (audio_callback_time)
{
time_diff = av_gettime_relative() - audio_callback_time;
delay -= (time_diff * s->audio_tgt.freq) / 1000000;
}
delay += 2 * data_used;
if (delay < data_used)
delay = data_used;
i_start = x = compute_mod(s->sample_array_index - delay * channels, SAMPLE_ARRAY_SIZE);
if (s->show_mode == SHOW_MODE_WAVES)
{
h = INT_MIN;
for (i = 0; i < 1000; i += channels)
{
int idx = (SAMPLE_ARRAY_SIZE + x - i) % SAMPLE_ARRAY_SIZE;
int a = s->sample_array[idx];
int b = s->sample_array[(idx + 4 * channels) % SAMPLE_ARRAY_SIZE];
int c = s->sample_array[(idx + 5 * channels) % SAMPLE_ARRAY_SIZE];
int d = s->sample_array[(idx + 9 * channels) % SAMPLE_ARRAY_SIZE];
int score = a - d;
if (h < score && (b ^ c) < 0)
{
h = score;
i_start = idx;
}
}
}
s->last_i_start = i_start;
}
else
{
i_start = s->last_i_start;
}
if (s->show_mode == SHOW_MODE_WAVES)
{
SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);
/* total height for one channel */
h = s->height / nb_display_channels;
/* graph height / 2 */
h2 = (h * 9) / 20;
for (ch = 0; ch < nb_display_channels; ch++)
{
i = i_start + ch;
y1 = s->ytop + ch * h + (h / 2); /* position of center line */
for (x = 0; x < s->width; x++)
{
y = (s->sample_array[i] * h2) >> 15;
if (y < 0)
{
y = -y;
ys = y1 - y;
}
else
{
ys = y1;
}
fill_rectangle(s->xleft + x, ys, 1, y);
i += channels;
if (i >= SAMPLE_ARRAY_SIZE)
i -= SAMPLE_ARRAY_SIZE;
}
}
SDL_SetRenderDrawColor(renderer, 0, 0, 255, 255);
for (ch = 1; ch < nb_display_channels; ch++)
{
y = s->ytop + ch * h;
fill_rectangle(s->xleft, y, s->width, 1);
}
}
else
{
if (realloc_texture(&s->vis_texture, SDL_PIXELFORMAT_ARGB8888, s->width, s->height, SDL_BLENDMODE_NONE, 1) < 0)
return;
if (s->xpos >= s->width)
s->xpos = 0;
nb_display_channels = FFMIN(nb_display_channels, 2);
if (rdft_bits != s->rdft_bits)
{
av_rdft_end(s->rdft);
av_free(s->rdft_data);
s->rdft = av_rdft_init(rdft_bits, DFT_R2C);
s->rdft_bits = rdft_bits;
s->rdft_data = av_malloc_array(nb_freq, 4 * sizeof(*s->rdft_data));
}
if (!s->rdft || !s->rdft_data)
{
s->show_mode = SHOW_MODE_WAVES;
}
else
{
FFTSample *data[2];
SDL_Rect rect = { .x = s->xpos,.y = 0,.w = 1,.h = s->height };
uint32_t *pixels;
int pitch;
for (ch = 0; ch < nb_display_channels; ch++)
{
data[ch] = s->rdft_data + 2 * nb_freq * ch;
i = i_start + ch;
for (x = 0; x < 2 * nb_freq; x++)
{
double w = (x - nb_freq) * (1.0 / nb_freq);
data[ch][x] = s->sample_array[i] * (1.0 - w * w);
i += channels;
if (i >= SAMPLE_ARRAY_SIZE)
i -= SAMPLE_ARRAY_SIZE;
}
av_rdft_calc(s->rdft, data[ch]);
}
/* Least efficient way to do this, we should of course
* directly access it but it is more than fast enough. */
if (!SDL_LockTexture(s->vis_texture, &rect, (void **)&pixels, &pitch))
{
pitch >>= 2;
pixels += pitch * s->height;
for (y = 0; y < s->height; y++)
{
double w = 1 / sqrt(nb_freq);
int a = sqrt(w * sqrt(data[0][2 * y + 0] * data[0][2 * y + 0] + data[0][2 * y + 1] * data[0][2 * y + 1]));
int b = (nb_display_channels == 2) ? sqrt(w * hypot(data[1][2 * y + 0], data[1][2 * y + 1]))
: a;
a = FFMIN(a, 255);
b = FFMIN(b, 255);
pixels -= pitch;
*pixels = (a << 16) + (b << 8) + ((a + b) >> 1);
}
SDL_UnlockTexture(s->vis_texture);
}
SDL_RenderCopy(renderer, s->vis_texture, NULL, NULL);
}
if (!s->paused)
s->xpos++;
}
}
static void stream_component_close(VideoState *is, int stream_index)
{
AVFormatContext *ic = is->ic;
AVCodecParameters *codecpar;
if (stream_index < 0 || stream_index >= ic->nb_streams)
return;
codecpar = ic->streams[stream_index]->codecpar;
switch (codecpar->codec_type)
{
case AVMEDIA_TYPE_AUDIO:
decoder_abort(&is->auddec, &is->sampq);
SDL_CloseAudioDevice(audio_dev);
decoder_destroy(&is->auddec);
swr_free(&is->swr_ctx);
av_freep(&is->audio_buf1);
is->audio_buf1_size = 0;
is->audio_buf = NULL;
if (is->rdft)
{
av_rdft_end(is->rdft);
av_freep(&is->rdft_data);
is->rdft = NULL;
is->rdft_bits = 0;
}
break;
case AVMEDIA_TYPE_VIDEO:
decoder_abort(&is->viddec, &is->pictq);
decoder_destroy(&is->viddec);
break;
case AVMEDIA_TYPE_SUBTITLE:
decoder_abort(&is->subdec, &is->subpq);
decoder_destroy(&is->subdec);
break;
default:
break;
}
ic->streams[stream_index]->discard = AVDISCARD_ALL;
switch (codecpar->codec_type)
{
case AVMEDIA_TYPE_AUDIO:
is->audio_st = NULL;
is->audio_stream = -1;
break;
case AVMEDIA_TYPE_VIDEO:
is->video_st = NULL;
is->video_stream = -1;
break;
case AVMEDIA_TYPE_SUBTITLE:
is->subtitle_st = NULL;
is->subtitle_stream = -1;
break;
default:
break;
}
}
static void stream_close(VideoState *is)
{
/* XXX: use a special url_shutdown call to abort parse cleanly */
is->abort_request = 1;
SDL_WaitThread(is->read_tid, NULL);
/* close each stream */
if (is->audio_stream >= 0)
stream_component_close(is, is->audio_stream);
if (is->video_stream >= 0)
stream_component_close(is, is->video_stream);
if (is->subtitle_stream >= 0)
stream_component_close(is, is->subtitle_stream);
avformat_close_input(&is->ic);
packet_queue_destroy(&is->videoq);
packet_queue_destroy(&is->audioq);
packet_queue_destroy(&is->subtitleq);
/* free all pictures */
frame_queue_destory(&is->pictq);
frame_queue_destory(&is->sampq);
frame_queue_destory(&is->subpq);
SDL_DestroyCond(is->continue_read_thread);
sws_freeContext(is->sub_convert_ctx);
av_free(is->filename);
if (is->vis_texture)
SDL_DestroyTexture(is->vis_texture);
if (is->vid_texture)
SDL_DestroyTexture(is->vid_texture);
if (is->sub_texture)
SDL_DestroyTexture(is->sub_texture);
av_free(is);
}
static void do_exit(VideoState *is)
{
if (is)
{
stream_close(is);
}
if (renderer)
SDL_DestroyRenderer(renderer);
if (window)
SDL_DestroyWindow(window);
///uninit_opts();
av_freep(&vfilters_list);
avformat_network_deinit();
if (show_status)
printf("\n");
SDL_Quit();
exit(0);
}
static void sigterm_handler(int sig)
{
exit(123);
}
static void set_default_window_size(int width, int height, AVRational sar)
{
SDL_Rect rect;
int max_width = screen_width ? screen_width : INT_MAX;
int max_height = screen_height ? screen_height : INT_MAX;
if (max_width == INT_MAX && max_height == INT_MAX)
max_height = height;
calculate_display_rect(&rect, 0, 0, max_width, max_height, width, height, sar);
default_width = rect.w;
default_height = rect.h;
}
static int video_open(VideoState *is)
{
int w, h;
w = screen_width ? screen_width : default_width;
h = screen_height ? screen_height : default_height;
if (!window_title)
{
window_title = input_filename;
}
SDL_SetWindowTitle(window, window_title);
SDL_SetWindowSize(window, w, h);
SDL_SetWindowPosition(window, screen_left, screen_top);
if (is_full_screen)
{
SDL_SetWindowFullscreen(window, SDL_WINDOW_FULLSCREEN_DESKTOP);
}
SDL_ShowWindow(window);
is->width = w;
is->height = h;
return 0;
}
/* display the current picture, if any */
static void video_display(VideoState *is)
{
if (!is->width)
{
video_open(is);
}
SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
SDL_RenderClear(renderer);
if (is->audio_st && is->show_mode != SHOW_MODE_VIDEO)
{
video_audio_display(is);
}
else if (is->video_st)
{
video_image_display(is);
}
SDL_RenderPresent(renderer);
}
static double get_clock(Clock *c)
{
if (*c->queue_serial != c->serial)
{
return NAN;
}
if (c->paused)
{
return c->pts;
}
else
{
double time = av_gettime_relative() / 1000000.0;
return c->pts_drift + time - (time - c->last_updated) * (1.0 - c->speed);
}
}
static void set_clock_at(Clock *c, double pts, int serial, double time)
{
c->pts = pts;
c->last_updated = time;
c->pts_drift = c->pts - time;
c->serial = serial;
}
static void set_clock(Clock *c, double pts, int serial)
{
double time = av_gettime_relative() / 1000000.0;
set_clock_at(c, pts, serial, time);
}
static void set_clock_speed(Clock *c, double speed)
{
set_clock(c, get_clock(c), c->serial);
c->speed = speed;
}
static void init_clock(Clock *c, int *queue_serial)
{
c->speed = 1.0;
c->paused = 0;
c->queue_serial = queue_serial;
set_clock(c, NAN, -1);
}
static void sync_clock_to_slave(Clock *c, Clock *slave)
{
double clock = get_clock(c);
double slave_clock = get_clock(slave);
if (!isnan(slave_clock) && (isnan(clock) || fabs(clock - slave_clock) > AV_NOSYNC_THRESHOLD))
{
set_clock(c, slave_clock, slave->serial);
}
}
static int get_master_sync_type(VideoState *is)
{
if (is->av_sync_type == AV_SYNC_VIDEO_MASTER)
{
if (is->video_st)
return AV_SYNC_VIDEO_MASTER;
else
return AV_SYNC_AUDIO_MASTER;
}
else if (is->av_sync_type == AV_SYNC_AUDIO_MASTER)
{
if (is->audio_st)
return AV_SYNC_AUDIO_MASTER;
else
return AV_SYNC_EXTERNAL_CLOCK;
}
else
{
return AV_SYNC_EXTERNAL_CLOCK;
}
}
/* get the current master clock value */
static double get_master_clock(VideoState *is)
{
double val;
switch (get_master_sync_type(is))
{
case AV_SYNC_VIDEO_MASTER:
val = get_clock(&is->vidclk);
break;
case AV_SYNC_AUDIO_MASTER:
val = get_clock(&is->audclk);
break;
default:
val = get_clock(&is->extclk);
break;
}
return val;
}
static double compute_target_delay(double delay, VideoState *is)
{
double sync_threshold, diff = 0;
/* update delay to follow master synchronisation source */
if (get_master_sync_type(is) != AV_SYNC_VIDEO_MASTER)
{
/* if video is slave, we try to correct big delays by
duplicating or deleting a frame */
diff = get_clock(&is->vidclk) - get_master_clock(is);
//diff负数时表 视频慢了，正数时表示视频快了
/* skip or repeat frame. We take into account the
delay to compute the threshold. I still don't know
if it is the best guess */
sync_threshold = FFMAX(AV_SYNC_THRESHOLD_MIN, FFMIN(AV_SYNC_THRESHOLD_MAX, delay));
if (!isnan(diff) && fabs(diff) < is->max_frame_duration)
{
if (diff <= -sync_threshold)
{
delay = FFMAX(0, delay + diff);
}
else if (diff >= sync_threshold && delay > AV_SYNC_FRAMEDUP_THRESHOLD)
{
delay = delay + diff;
}
else if (diff >= sync_threshold)
{
delay = 2 * delay;
}
}
}
return delay;
}
static double vp_duration(VideoState *is, Frame *vp, Frame *nextvp)
{
if (vp->serial == nextvp->serial)
{
double duration = nextvp->pts - vp->pts;
if (isnan(duration) || duration <= 0 || duration > is->max_frame_duration)
return vp->duration;
else
return duration;
}
else
{
return 0.0;
}
}
static void update_video_pts(VideoState *is, double pts, int serial)
{
/* update current video pts */
set_clock(&is->vidclk, pts, serial);
sync_clock_to_slave(&is->extclk, &is->vidclk);
}
/* called to display each frame */
static void video_refresh(void *opaque, double *remaining_time)
{
VideoState *is = opaque;
double time = 0;
if (!is->paused && get_master_sync_type(is) == AV_SYNC_EXTERNAL_CLOCK && is->realtime)
{
// 音频为主频，这里不会进
}
if (!display_disable && is->show_mode != SHOW_MODE_VIDEO && is->audio_st)
{
/* 视频选项正常显示 (is->show_mode == SHOW_MODE_VIDEO) 这里不会进
*/
}
if (is->video_st)
{
retry:
if (frame_queue_nb_remaining(&is->pictq) == 0)
{
// nothing to do, no picture to display in the queue
}
else
{
double last_duration, duration, delay;
Frame *vp, *lastvp;
lastvp = frame_queue_peek_last(&is->pictq);
vp = frame_queue_peek(&is->pictq);
if (vp->serial != is->videoq.serial)
{
frame_queue_next(&is->pictq);
goto retry;
}
last_duration = vp_duration(is, lastvp, vp);
delay = compute_target_delay(last_duration, is);
time = av_gettime_relative() / 1000000.0;
if (time < is->frame_timer + delay)
{
//还是显示 lastvp帧，vp帧还没到时间
*remaining_time = FFMIN(is->frame_timer + delay - time, *remaining_time);
goto display;
}
is->frame_timer += delay;
if (delay > 0 && time - is->frame_timer > AV_SYNC_THRESHOLD_MAX)
{
// 记录 vp帧 时间
is->frame_timer = time;
}
SDL_LockMutex(is->pictq.mutex);
if (!isnan(vp->pts))
{
//更新视频 时钟时间
update_video_pts(is, vp->pts, vp->serial);
}
SDL_UnlockMutex(is->pictq.mutex);
if (frame_queue_nb_remaining(&is->pictq) > 1)
{
Frame *nextvp = frame_queue_peek_next(&is->pictq);
duration = vp_duration(is, vp, nextvp);
if (!is->step && (framedrop > 0 || (framedrop && get_master_sync_type(is) != AV_SYNC_VIDEO_MASTER)) && time > is->frame_timer + duration)
{
// 丢帧
is->frame_drops_late++;
frame_queue_next(&is->pictq);
goto retry;
}
}
frame_queue_next(&is->pictq);
is->force_refresh = 1;
}
display:
/* display picture */
if (!display_disable && is->force_refresh && is->show_mode == SHOW_MODE_VIDEO && is->pictq.rindex_shown)
{
video_display(is);
}
}
is->force_refresh = 0;
}
static int queue_picture(VideoState *is, AVFrame *src_frame, double pts, double duration, int64_t pos, int serial)
{
Frame *vp;
#if defined(DEBUG_SYNC)
printf("frame_type=%c pts=%0.3f\n",
av_get_picture_type_char(src_frame->pict_type), pts);
#endif
if (!(vp = frame_queue_peek_writable(&is->pictq)))
return -1;
vp->sar = src_frame->sample_aspect_ratio;
vp->uploaded = 0;
vp->width = src_frame->width;
vp->height = src_frame->height;
vp->format = src_frame->format;
vp->pts = pts;
vp->duration = duration;
vp->pos = pos;
vp->serial = serial;
set_default_window_size(vp->width, vp->height, vp->sar);
av_frame_move_ref(vp->frame, src_frame);
frame_queue_push(&is->pictq);
return 0;
}
static int get_video_frame(VideoState *is, AVFrame *frame)
{
int got_picture;
if ((got_picture = decoder_decode_frame(&is->viddec, frame, NULL)) < 0)
return -1;
if (got_picture)
{
double dpts = NAN;
if (frame->pts != AV_NOPTS_VALUE)
{
dpts = av_q2d(is->video_st->time_base) * frame->pts;
}
frame->sample_aspect_ratio = av_guess_sample_aspect_ratio(is->ic, is->video_st, frame);
if (framedrop > 0 || (framedrop && get_master_sync_type(is) != AV_SYNC_VIDEO_MASTER))
{
if (frame->pts != AV_NOPTS_VALUE)
{
double diff = dpts - get_master_clock(is);
int y= fabs(diff) < AV_NOSYNC_THRESHOLD;
if (!isnan(diff) && fabs(diff) < AV_NOSYNC_THRESHOLD &&
diff - is->frame_last_filter_delay < 0 &&
is->viddec.pkt_serial == is->vidclk.serial &&
is->videoq.nb_packets)
{
is->frame_drops_early++;
av_frame_unref(frame);
got_picture = 0;
}
}
}
}
return got_picture;
}
static int audio_thread(void *arg)
{
VideoState *is = arg;
AVFrame *frame = av_frame_alloc();
Frame *af;
int last_serial = -1;
int reconfigure;
int got_frame = 0;
AVRational tb;
int ret = 0;
if (!frame)
return AVERROR(ENOMEM);
do
{
if ((got_frame = decoder_decode_frame(&is->auddec, frame, NULL)) < 0)
goto the_end;
if (got_frame)
{
tb = (AVRational) { 1, frame->sample_rate };
if (!(af = frame_queue_peek_writable(&is->sampq)))
{
goto the_end;
}
af->pts = (frame->pts == AV_NOPTS_VALUE) ? NAN : frame->pts * av_q2d(tb);
af->pos = frame->pkt_pos;
af->serial = is->auddec.pkt_serial;
af->duration = av_q2d((AVRational) { frame->nb_samples, frame->sample_rate });
av_frame_move_ref(af->frame, frame);
frame_queue_push(&is->sampq);
if (ret == AVERROR_EOF)
is->auddec.finished = is->auddec.pkt_serial;
}
} while (ret >= 0 || ret == AVERROR(EAGAIN) || ret == AVERROR_EOF);
the_end:
//avfilter_graph_free(&is->agraph);
av_frame_free(&frame);
return ret;
}
static int decoder_start(Decoder *d, int(*fn)(void *), const char *thread_name, void* arg)
{
packet_queue_start(d->queue);
d->decoder_tid = SDL_CreateThread(fn, thread_name, arg);
if (!d->decoder_tid)
{
return AVERROR(ENOMEM);
}
return 0;
}
AVFrame* GetFrameFromFile(const char *filename, AVRational *logo_tb, AVRational *logo_fr)
{
int ret = 0;
//AVDictionary *format_opts = NULL;
//av_dict_set(&format_opts, "probesize", "5000000", 0);
AVFormatContext *format_ctx = NULL;
if ((ret = avformat_open_input(&format_ctx, filename, NULL, NULL)) != 0)
{
printf("Error: avformat_open_input failed \n");
return NULL;
}
avformat_find_stream_info(format_ctx, NULL);
*logo_tb = format_ctx->streams[0]->time_base;
*logo_fr = av_guess_frame_rate(format_ctx, format_ctx->streams[0], NULL);
//打开解码器
AVCodecContext *av_codec_ctx = avcodec_alloc_context3(NULL);
ret = avcodec_parameters_to_context(av_codec_ctx, format_ctx->streams[0]->codecpar);
if (ret < 0)
{
printf("error code %d \n", ret);
avformat_close_input(&format_ctx);
return NULL;
}
AVDictionary *codec_opts = NULL;
av_dict_set(&codec_opts, "sub_text_format", "ass", 0);
AVCodec *codec = avcodec_find_decoder(av_codec_ctx->codec_id);
if (!codec)
{
printf("codec not support %d \n", ret);
return NULL;
}
if ((ret = avcodec_open2(av_codec_ctx, codec, NULL)) < 0)
{
printf("open codec faile %d \n", ret);
return NULL;
}
AVPacket *pkt = av_packet_alloc();;
//av_init_packet(&pkt);
//pkt.data = NULL;
//pkt.size = 0;
ret = av_read_frame(format_ctx, pkt);
ret = avcodec_send_packet(av_codec_ctx, pkt);
AVFrame *frame_2 = av_frame_alloc();
ret = avcodec_receive_frame(av_codec_ctx, frame_2);
//av_dict_free(&format_opts);
av_dict_free(&codec_opts);
av_packet_free(&pkt);
if (ret != 0)
{
return NULL;
}
return frame_2;
}
AVFilterGraph *filter_graph = NULL;
AVFilterContext *mainsrc_ctx = NULL, *logo_ctx = NULL, *resultsink_ctx = NULL;
AVFrame* VideoFilter(AVFrame* frame)
{
AVFrame *result_frame = av_frame_alloc();
int64_t logo_next_pts = 0, main_next_pts = 0;
int ret = 0;
AVRational logo_tb = { 0 };
AVRational logo_fr = { 0 };
AVFilterInOut *inputs = NULL, *cur = NULL, *outputs = NULL;
// 滤镜设置一次就可以了
if (NULL == filter_graph)
{
AVFrame *logo_frame = GetFrameFromFile("logo.jpg", &logo_tb, &logo_fr);
if (logo_frame == NULL)
{
return frame; ///滤镜处理失败时
}
//初始化滤镜容器
filter_graph = avfilter_graph_alloc();
if (!filter_graph)
{
printf("Error: allocate filter graph failed\n");
return frame;
}
//AVPixelFormat
AVRational tb = { 1,25 };// 简单设置一下
AVRational fr = {1,25};//简单设置一下
AVRational logo_sar = logo_frame->sample_aspect_ratio;
AVRational sar = frame->sample_aspect_ratio;
AVBPrint args;
const char* pixfmt = av_get_pix_fmt_name(frame->format);
av_bprint_init(&args, 0, AV_BPRINT_SIZE_AUTOMATIC);
///拼接滤镜字符串
av_bprintf(&args,
"buffer=video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:pixel_aspect=%d/%d:frame_rate=%d/%d[main];"
"buffer=video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:pixel_aspect=%d/%d:frame_rate=%d/%d[logo];"
"[main][logo]overlay=x=300:y=100[result];"
"[result]format=%s[result_2];"
"[result_2]buffersink",
frame->width, frame->height, frame->format, tb.num, tb.den, sar.num, sar.den, fr.num, fr.den,
logo_frame->width, logo_frame->height, logo_frame->format, logo_tb.num, logo_tb.den,
logo_sar.num, logo_sar.den, logo_fr.num, logo_fr.den, pixfmt);
//解析滤镜字符串，调函数走个过场而已
ret = avfilter_graph_parse2(filter_graph, args.str, &inputs, &outputs);
if (ret < 0)
{
return frame;
}
//正式打开滤镜，开始使用
ret = avfilter_graph_config(filter_graph, NULL);
if (ret < 0)
{
return frame;
}
//根据 名字 找到 AVFilterContext
mainsrc_ctx = avfilter_graph_get_filter(filter_graph, "Parsed_buffer_0");
logo_ctx = avfilter_graph_get_filter(filter_graph, "Parsed_buffer_1");
resultsink_ctx = avfilter_graph_get_filter(filter_graph, "Parsed_buffersink_4");
///编号1输入源加图片帧，因为只有一张图片, 加一次就可以了
ret = av_buffersrc_add_frame_flags(logo_ctx, logo_frame, AV_BUFFERSRC_FLAG_PUSH);
if (ret < 0)
{
return frame;
}
logo_next_pts = logo_frame->pts + logo_frame->pkt_duration;
ret = av_buffersrc_close(logo_ctx, logo_next_pts, AV_BUFFERSRC_FLAG_PUSH);
av_frame_unref(logo_frame);
}
//编号0输入源加更新视频帧
ret = av_buffersrc_add_frame_flags(mainsrc_ctx, frame, AV_BUFFERSRC_FLAG_PUSH);
if (ret < 0)
{
return frame;
}
//从4号滤镜中取出合成视频帧
ret = av_buffersink_get_frame_flags(resultsink_ctx, result_frame, AV_BUFFERSINK_FLAG_NO_REQUEST);
if (ret < 0)
{
return frame;
}
av_frame_unref(frame);
return result_frame;
}
static int video_thread(void *arg)
{
VideoState *is = arg;
AVFrame *frame = av_frame_alloc();
double pts;
double duration;
int ret;
AVRational tb = is->video_st->time_base;
AVRational frame_rate = av_guess_frame_rate(is->ic, is->video_st, NULL);
int last_w = 0;
int last_h = 0;
enum AVPixelFormat last_format = -2;
int last_serial = -1;
int last_vfilter_idx = 0;
if (!frame)
return AVERROR(ENOMEM);
for (;;)
{
ret = get_video_frame(is, frame);
if (ret < 0)
goto the_end;
if (!ret)
continue;
is->frame_last_filter_delay = av_gettime_relative() / 1000000.0 - is->frame_last_returned_time;
if (fabs(is->frame_last_filter_delay) > AV_NOSYNC_THRESHOLD / 10.0)
is->frame_last_filter_delay = 0;
duration = (frame_rate.num && frame_rate.den ? av_q2d((AVRational) { frame_rate.den, frame_rate.num }) : 0);
pts = (frame->pts == AV_NOPTS_VALUE) ? NAN : frame->pts * av_q2d(tb);
frame = VideoFilter(frame);
ret = queue_picture(is, frame, pts, duration, frame->pts, is->viddec.pkt_serial);
av_frame_unref(frame);
if (ret < 0)
goto the_end;
}
the_end:
av_frame_free(&frame);
return 0;
}
static int subtitle_thread(void *arg)
{
VideoState *is = arg;
Frame *sp;
int got_subtitle;
double pts;
for (;;)
{
if (!(sp = frame_queue_peek_writable(&is->subpq)))
return 0;
if ((got_subtitle = decoder_decode_frame(&is->subdec, NULL, &sp->sub)) < 0)
break;
pts = 0;
if (got_subtitle && sp->sub.format == 0)
{
if (sp->sub.pts != AV_NOPTS_VALUE)
pts = sp->sub.pts / (double)AV_TIME_BASE;
sp->pts = pts;
sp->serial = is->subdec.pkt_serial;
sp->width = is->subdec.avctx->width;
sp->height = is->subdec.avctx->height;
sp->uploaded = 0;
/* now we can update the picture count */
frame_queue_push(&is->subpq);
}
else if (got_subtitle)
{
avsubtitle_free(&sp->sub);
}
}
return 0;
}
/* copy samples for viewing in editor window */
static void update_sample_display(VideoState *is, short *samples, int samples_size)
{
int size, len;
size = samples_size / sizeof(short);
while (size > 0)
{
len = SAMPLE_ARRAY_SIZE - is->sample_array_index;
if (len > size)
len = size;
memcpy(is->sample_array + is->sample_array_index, samples, len * sizeof(short));
samples += len;
is->sample_array_index += len;
if (is->sample_array_index >= SAMPLE_ARRAY_SIZE)
is->sample_array_index = 0;
size -= len;
}
}
/* return the wanted number of samples to get better sync if sync_type is video
* or external master clock */
static int synchronize_audio(VideoState *is, int nb_samples)
{
int wanted_nb_samples = nb_samples;
/* if not master, then we try to remove or add samples to correct the clock */
if (get_master_sync_type(is) != AV_SYNC_AUDIO_MASTER)
{
double diff, avg_diff;
int min_nb_samples, max_nb_samples;
diff = get_clock(&is->audclk) - get_master_clock(is);
if (!isnan(diff) && fabs(diff) < AV_NOSYNC_THRESHOLD)
{
is->audio_diff_cum = diff + is->audio_diff_avg_coef * is->audio_diff_cum;
if (is->audio_diff_avg_count < AUDIO_DIFF_AVG_NB)
{
/* not enough measures to have a correct estimate */
is->audio_diff_avg_count++;
}
else
{
/* estimate the A-V difference */
avg_diff = is->audio_diff_cum * (1.0 - is->audio_diff_avg_coef);
if (fabs(avg_diff) >= is->audio_diff_threshold)
{
wanted_nb_samples = nb_samples + (int)(diff * is->audio_src.freq);
min_nb_samples = ((nb_samples * (100 - SAMPLE_CORRECTION_PERCENT_MAX) / 100));
max_nb_samples = ((nb_samples * (100 + SAMPLE_CORRECTION_PERCENT_MAX) / 100));
wanted_nb_samples = av_clip(wanted_nb_samples, min_nb_samples, max_nb_samples);
}
}
}
else
{
/* too big difference : may be initial PTS errors, so
reset A-V filter */
is->audio_diff_avg_count = 0;
is->audio_diff_cum = 0;
}
}
return wanted_nb_samples;
}
/**
* Decode one audio frame and return its uncompressed size.
*
* The processed audio frame is decoded, converted if required, and
* stored in is->audio_buf, with size in bytes given by the return
* value.
*/
static int audio_decode_frame(VideoState *is)
{
int data_size, resampled_data_size;
///av_unused double audio_clock0;
///int wanted_nb_samples;
Frame *af;
if (is->paused)
return -1;
do
{
#if defined(_WIN32)
while (frame_queue_nb_remaining(&is->sampq) == 0)
{
if ((av_gettime_relative() - audio_callback_time) > 1000000LL * is->audio_hw_buf_size / is->audio_tgt.bytes_per_sec / 2)
{
return -1;
}
av_usleep(1000);
}
#endif
if (!(af = frame_queue_peek_readable(&is->sampq)))
{
return -1;
}
frame_queue_next(&is->sampq);
} while (af->serial != is->audioq.serial);
data_size = av_samples_get_buffer_size(NULL, af->frame->ch_layout.nb_channels,
af->frame->nb_samples,
af->frame->format, 1);
///wanted_nb_samples = synchronize_audio(is, af->frame->nb_samples);
#pragma region 音频格式都转成 ->AV_SAMPLE_FMT_S16格式,
int wanted_nb_samples = af->frame->nb_samples;
if (is->audio_src.fmt != af->frame->format || af->frame->sample_rate!= is->audio_src.freq)
{
is->audio_src.freq = af->frame->sample_rate;
is->audio_src.fmt = af->frame->format;
if (NULL != is->swr_ctx)
{
swr_free(&is->swr_ctx);
}
swr_alloc_set_opts2(&is->swr_ctx,
&is->audio_tgt.ch_layout, AV_SAMPLE_FMT_S16, is->audio_tgt.freq,
&af->frame->ch_layout, af->frame->format, af->frame->sample_rate,
0, NULL);
if (!is->swr_ctx || swr_init(is->swr_ctx) < 0)
{
swr_free(&is->swr_ctx);
return -1;
}
}
if (is->swr_ctx)
{
const uint8_t **in = (const uint8_t **)af->frame->extended_data;
uint8_t **out = &is->audio_buf1;
int out_count = (int64_t)wanted_nb_samples * is->audio_tgt.freq / af->frame->sample_rate + 256;
int out_size = av_samples_get_buffer_size(NULL, is->audio_tgt.ch_layout.nb_channels, out_count, is->audio_tgt.fmt, 0);
int len2 = 0;
if (out_size < 0)
{
return -1;
}
if (wanted_nb_samples != af->frame->nb_samples)
{
if (swr_set_compensation(is->swr_ctx, (wanted_nb_samples - af->frame->nb_samples) * is->audio_tgt.freq / af->frame->sample_rate,
wanted_nb_samples * is->audio_tgt.freq / af->frame->sample_rate) < 0)
{
return -1;
}
}
av_fast_malloc(&is->audio_buf1, &is->audio_buf1_size, out_size);
if (!is->audio_buf1)
return AVERROR(ENOMEM);
len2 = swr_convert(is->swr_ctx, out, out_count, in, af->frame->nb_samples);
if (len2 < 0)
{
return -1;
}
if (len2 == out_count)
{
if (swr_init(is->swr_ctx) < 0)
swr_free(&is->swr_ctx);
}
is->audio_buf = is->audio_buf1;
resampled_data_size = len2 * is->audio_tgt.ch_layout.nb_channels * av_get_bytes_per_sample(is->audio_tgt.fmt);
}
else
{
is->audio_buf = af->frame->data[0];
resampled_data_size = data_size;
}
#pragma endregion
//is->audio_buf = af->frame->data[0];
///resampled_data_size = data_size;
///audio_clock0 = is->audio_clock;
/* update the audio clock with the pts */
if (!isnan(af->pts))
{
is->audio_clock = af->pts + (double)af->frame->nb_samples / af->frame->sample_rate;
}
else
{
is->audio_clock = NAN;
}
is->audio_clock_serial = af->serial;
return resampled_data_size;
}
/* prepare a new audio buffer */
static void sdl_audio_callback(void *opaque, Uint8 *stream, int len)
{
VideoState *is = opaque;
int audio_size, len1;
audio_callback_time = av_gettime_relative();
while (len > 0)
{
if (is->audio_buf_index >= is->audio_buf_size)
{
audio_size = audio_decode_frame(is);
if (audio_size < 0)
{
/* if error, just output silence */
is->audio_buf = NULL;
is->audio_buf_size = SDL_AUDIO_MIN_BUFFER_SIZE / is->audio_tgt.frame_size * is->audio_tgt.frame_size;
}
else
{
if (is->show_mode != SHOW_MODE_VIDEO)
{
update_sample_display(is, (int16_t *)is->audio_buf, audio_size);
}
is->audio_buf_size = audio_size;
}
is->audio_buf_index = 0;
}
len1 = is->audio_buf_size - is->audio_buf_index;
if (len1 > len)
{
len1 = len;
}
if (!is->muted && is->audio_buf && is->audio_volume == SDL_MIX_MAXVOLUME)
{
memcpy(stream, (uint8_t *)is->audio_buf + is->audio_buf_index, len1);
}
else
{
memset(stream, 0, len1);
if (!is->muted && is->audio_buf)
{
SDL_MixAudioFormat(stream, (uint8_t *)is->audio_buf + is->audio_buf_index, AUDIO_S16SYS, len1, is->audio_volume);
}
}
len -= len1;
stream += len1;
is->audio_buf_index += len1;
}
is->audio_write_buf_size = is->audio_buf_size - is->audio_buf_index;
/* Let's assume the audio driver that is used by SDL has two periods. */
if (!isnan(is->audio_clock))
{
//2 * is->audio_hw_buf_size是因为 sdl分为内部 hw_buf 和 外部hw_buf
set_clock_at(&is->audclk, is->audio_clock - (double)(2 * is->audio_hw_buf_size + is->audio_write_buf_size) / is->audio_tgt.bytes_per_sec, is->audio_clock_serial, audio_callback_time / 1000000.0);
sync_clock_to_slave(&is->extclk, &is->audclk);
}
}
static int audio_open(void *opaque, AVChannelLayout *wanted_channel_layout, int wanted_sample_rate, struct AudioParams *audio_hw_params)
{
SDL_AudioSpec wanted_spec, spec;
const char *env;
static const int next_nb_channels[] = { 0, 0, 1, 6, 2, 6, 4, 6 };
static const int next_sample_rates[] = { 0, 44100, 48000, 96000, 192000 };
int next_sample_rate_idx = FF_ARRAY_ELEMS(next_sample_rates) - 1;
int wanted_nb_channels = wanted_channel_layout->nb_channels;
env = SDL_getenv("SDL_AUDIO_CHANNELS");
if (env)
{
wanted_nb_channels = atoi(env);
av_channel_layout_uninit(wanted_channel_layout);
av_channel_layout_default(wanted_channel_layout, wanted_nb_channels);
}
if (wanted_channel_layout->order != AV_CHANNEL_ORDER_NATIVE)
{
av_channel_layout_uninit(wanted_channel_layout);
av_channel_layout_default(wanted_channel_layout, wanted_nb_channels);
}
wanted_nb_channels = wanted_channel_layout->nb_channels;
wanted_spec.channels = wanted_nb_channels;
wanted_spec.freq = wanted_sample_rate;
if (wanted_spec.freq <= 0 || wanted_spec.channels <= 0)
{
return -1;
}
while (next_sample_rate_idx && next_sample_rates[next_sample_rate_idx] >= wanted_spec.freq)
next_sample_rate_idx--;
wanted_spec.format = AUDIO_S16SYS;
wanted_spec.silence = 0;
wanted_spec.samples = FFMAX(SDL_AUDIO_MIN_BUFFER_SIZE, 2 << av_log2(wanted_spec.freq / SDL_AUDIO_MAX_CALLBACKS_PER_SEC));
wanted_spec.callback = sdl_audio_callback;
wanted_spec.userdata = opaque;
while (!(audio_dev = SDL_OpenAudioDevice(NULL, 0, &wanted_spec, &spec, SDL_AUDIO_ALLOW_FREQUENCY_CHANGE | SDL_AUDIO_ALLOW_CHANNELS_CHANGE)))
{
wanted_spec.channels = next_nb_channels[FFMIN(7, wanted_spec.channels)];
if (!wanted_spec.channels)
{
wanted_spec.freq = next_sample_rates[next_sample_rate_idx--];
wanted_spec.channels = wanted_nb_channels;
if (!wanted_spec.freq)
{
return -1;
}
}
av_channel_layout_default(wanted_channel_layout, wanted_spec.channels);
}
if (spec.format != AUDIO_S16SYS)
{
return -1;
}
if (spec.channels != wanted_spec.channels)
{
av_channel_layout_uninit(wanted_channel_layout);
av_channel_layout_default(wanted_channel_layout, spec.channels);
if (wanted_channel_layout->order != AV_CHANNEL_ORDER_NATIVE)
{
return -1;
}
}
audio_hw_params->fmt = AV_SAMPLE_FMT_S16;
audio_hw_params->freq = spec.freq;
if (av_channel_layout_copy(&audio_hw_params->ch_layout, wanted_channel_layout) < 0)
return -1;
audio_hw_params->frame_size = av_samples_get_buffer_size(NULL, audio_hw_params->ch_layout.nb_channels, 1, audio_hw_params->fmt, 1);
audio_hw_params->bytes_per_sec = av_samples_get_buffer_size(NULL, audio_hw_params->ch_layout.nb_channels, audio_hw_params->freq, audio_hw_params->fmt, 1);
if (audio_hw_params->bytes_per_sec <= 0 || audio_hw_params->frame_size <= 0)
{
return -1;
}
return spec.size;
}
/* open a given stream. Return 0 if OK */
static int stream_component_open(VideoState *is, int stream_index)
{
AVFormatContext *ic = is->ic;
AVCodecContext *avctx;
const AVCodec *codec;
AVDictionary *opts = NULL;
const AVDictionaryEntry *t = NULL;
int sample_rate;
AVChannelLayout ch_layout = { 0 };
int ret = 0;
int stream_lowres = lowres;
if (stream_index < 0 || stream_index >= ic->nb_streams)
{
return -1;
}
avctx = avcodec_alloc_context3(NULL);
if (!avctx)
{
return AVERROR(ENOMEM);
}
ret = avcodec_parameters_to_context(avctx, ic->streams[stream_index]->codecpar);
if (ret < 0)
{
goto fail;
}
avctx->pkt_timebase = ic->streams[stream_index]->time_base;
codec = avcodec_find_decoder(avctx->codec_id);
switch (avctx->codec_type)
{
case AVMEDIA_TYPE_AUDIO:
is->last_audio_stream = stream_index;
break;
case AVMEDIA_TYPE_SUBTITLE:
is->last_subtitle_stream = stream_index;
break;
case AVMEDIA_TYPE_VIDEO:
is->last_video_stream = stream_index;
break;
}
if (!codec)
{
ret = AVERROR(EINVAL);
goto fail;
}
avctx->codec_id = codec->id;
if (stream_lowres > codec->max_lowres)
{
stream_lowres = codec->max_lowres;
}
avctx->lowres = stream_lowres;
if (fast)
{
avctx->flags2 |= AV_CODEC_FLAG2_FAST;
}
if (!av_dict_get(opts, "threads", NULL, 0))
{
av_dict_set(&opts, "threads", "auto", 0);
}
if (stream_lowres)
{
av_dict_set_int(&opts, "lowres", stream_lowres, 0);
}
av_dict_set(&opts, "flags", "+copy_opaque", AV_DICT_MULTIKEY);
if ((ret = avcodec_open2(avctx, codec, &opts)) < 0)
{
goto fail;
}
if ((t = av_dict_get(opts, "", NULL, AV_DICT_IGNORE_SUFFIX)))
{
ret = AVERROR_OPTION_NOT_FOUND;
goto fail;
}
is->eof = 0;
ic->streams[stream_index]->discard = AVDISCARD_DEFAULT;
switch (avctx->codec_type)
{
case AVMEDIA_TYPE_AUDIO:
{
sample_rate = avctx->sample_rate;
av_channel_layout_copy(&ch_layout, &avctx->ch_layout);
}
/* prepare audio output */
if ((ret = audio_open(is, &ch_layout, sample_rate, &is->audio_tgt)) < 0)
goto fail;
is->audio_hw_buf_size = ret;
is->audio_src = is->audio_tgt;
is->audio_buf_size = 0;
is->audio_buf_index = 0;
/* init averaging filter */
is->audio_diff_avg_coef = exp(log(0.01) / AUDIO_DIFF_AVG_NB);
is->audio_diff_avg_count = 0;
/* since we do not have a precise anough audio FIFO fullness,
we correct audio sync only if larger than this threshold */
is->audio_diff_threshold = (double)(is->audio_hw_buf_size) / is->audio_tgt.bytes_per_sec;
is->audio_stream = stream_index;
is->audio_st = ic->streams[stream_index];
if ((ret = decoder_init(&is->auddec, avctx, &is->audioq, is->continue_read_thread)) < 0)
goto fail;
if ((is->ic->iformat->flags & (AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH | AVFMT_NO_BYTE_SEEK)) && !is->ic->iformat->read_seek) {
is->auddec.start_pts = is->audio_st->start_time;
is->auddec.start_pts_tb = is->audio_st->time_base;
}
if ((ret = decoder_start(&is->auddec, audio_thread, "audio_decoder", is)) < 0)
goto out;
SDL_PauseAudioDevice(audio_dev, 0);
break;
case AVMEDIA_TYPE_VIDEO:
is->video_stream = stream_index;
is->video_st = ic->streams[stream_index];
if ((ret = decoder_init(&is->viddec, avctx, &is->videoq, is->continue_read_thread)) < 0)
goto fail;
if ((ret = decoder_start(&is->viddec, video_thread, "video_decoder", is)) < 0)
goto out;
is->queue_attachments_req = 1;
break;
case AVMEDIA_TYPE_SUBTITLE:
is->subtitle_stream = stream_index;
is->subtitle_st = ic->streams[stream_index];
if ((ret = decoder_init(&is->subdec, avctx, &is->subtitleq, is->continue_read_thread)) < 0)
goto fail;
if ((ret = decoder_start(&is->subdec, subtitle_thread, "subtitle_decoder", is)) < 0)
goto out;
break;
default:
break;
}
goto out;
fail:
avcodec_free_context(&avctx);
out:
av_channel_layout_uninit(&ch_layout);
av_dict_free(&opts);
return ret;
}
static int decode_interrupt_cb(void *ctx)
{
VideoState *is = ctx;
return is->abort_request;
}
static int stream_has_enough_packets(AVStream *st, int stream_id, PacketQueue *queue)
{
return stream_id < 0 ||
queue->abort_request ||
(st->disposition & AV_DISPOSITION_ATTACHED_PIC) ||
queue->nb_packets > MIN_FRAMES && (!queue->duration || av_q2d(st->time_base) * queue->duration > 1.0);
}
static int is_realtime(AVFormatContext *s)
{
if (!strcmp(s->iformat->name, "rtp")
|| !strcmp(s->iformat->name, "rtsp")
|| !strcmp(s->iformat->name, "sdp")
)
return 1;
if (s->pb && (!strncmp(s->url, "rtp:", 4)
|| !strncmp(s->url, "udp:", 4)
)
)
return 1;
return 0;
}
/* this thread gets the stream from the disk or the network */
static int read_thread(void *arg)
{
VideoState *is = arg;
AVFormatContext *ic = NULL;
int err, i, ret;
int st_index[AVMEDIA_TYPE_NB];
AVPacket *pkt = NULL;
int64_t stream_start_time;
int pkt_in_play_range = 0;
const AVDictionaryEntry *t;
SDL_mutex *wait_mutex = SDL_CreateMutex();
int scan_all_pmts_set = 0;
int64_t pkt_ts;
if (!wait_mutex)
{
ret = AVERROR(ENOMEM);
goto fail;
}
memset(st_index, -1, sizeof(st_index));
is->eof = 0;
pkt = av_packet_alloc();
if (!pkt)
{
ret = AVERROR(ENOMEM);
goto fail;
}
ic = avformat_alloc_context();
if (!ic)
{
ret = AVERROR(ENOMEM);
goto fail;
}
err = avformat_open_input(&ic, is->filename, is->iformat, NULL);
ic->interrupt_callback.callback = decode_interrupt_cb;
ic->interrupt_callback.opaque = is;
if (err < 0)
{
//print_error(is->filename, err);
ret = -1;
goto fail;
}
is->ic = ic;
if (genpts)
ic->flags |= AVFMT_FLAG_GENPTS;
av_format_inject_global_side_data(ic);
if (ic->pb)
ic->pb->eof_reached = 0; // FIXME hack, ffplay maybe should not use avio_feof() to test for the end
if (seek_by_bytes < 0)
seek_by_bytes = !(ic->iformat->flags & AVFMT_NO_BYTE_SEEK) &&
!!(ic->iformat->flags & AVFMT_TS_DISCONT) &&
strcmp("ogg", ic->iformat->name);
is->max_frame_duration = (ic->iformat->flags & AVFMT_TS_DISCONT) ? 10.0 : 3600.0;
if (!window_title && (t = av_dict_get(ic->metadata, "title", NULL, 0)))
window_title = av_asprintf("%s - %s", t->value, input_filename);
/* if seeking requested, we execute it */
is->realtime = is_realtime(ic);
if (!video_disable)
st_index[AVMEDIA_TYPE_VIDEO] =
av_find_best_stream(ic, AVMEDIA_TYPE_VIDEO,
st_index[AVMEDIA_TYPE_VIDEO], -1, NULL, 0);
if (!audio_disable)
st_index[AVMEDIA_TYPE_AUDIO] =
av_find_best_stream(ic, AVMEDIA_TYPE_AUDIO,
st_index[AVMEDIA_TYPE_AUDIO],
st_index[AVMEDIA_TYPE_VIDEO],
NULL, 0);
if (!video_disable && !subtitle_disable)
st_index[AVMEDIA_TYPE_SUBTITLE] =
av_find_best_stream(ic, AVMEDIA_TYPE_SUBTITLE,
st_index[AVMEDIA_TYPE_SUBTITLE],
(st_index[AVMEDIA_TYPE_AUDIO] >= 0 ?
st_index[AVMEDIA_TYPE_AUDIO] :
st_index[AVMEDIA_TYPE_VIDEO]),
NULL, 0);
is->show_mode = show_mode;
if (st_index[AVMEDIA_TYPE_VIDEO] >= 0)
{
AVStream *st = ic->streams[st_index[AVMEDIA_TYPE_VIDEO]];
AVCodecParameters *codecpar = st->codecpar;
AVRational sar = av_guess_sample_aspect_ratio(ic, st, NULL);
if (codecpar->width)
set_default_window_size(codecpar->width, codecpar->height, sar);
}
/* open the streams */
if (st_index[AVMEDIA_TYPE_AUDIO] >= 0)
{
stream_component_open(is, st_index[AVMEDIA_TYPE_AUDIO]);
}
ret = -1;
if (st_index[AVMEDIA_TYPE_VIDEO] >= 0)
{
ret = stream_component_open(is, st_index[AVMEDIA_TYPE_VIDEO]);
}
if (is->show_mode == SHOW_MODE_NONE)
is->show_mode = ret >= 0 ? SHOW_MODE_VIDEO : SHOW_MODE_RDFT;
if (st_index[AVMEDIA_TYPE_SUBTITLE] >= 0)
{
stream_component_open(is, st_index[AVMEDIA_TYPE_SUBTITLE]);
}
if (is->video_stream < 0 && is->audio_stream < 0)
{
ret = -1;
goto fail;
}
if (infinite_buffer < 0 && is->realtime)
infinite_buffer = 1;
for (;;)
{
if (is->abort_request)
break;
if (is->paused != is->last_paused)
{
is->last_paused = is->paused;
if (is->paused)
{
is->read_pause_return = av_read_pause(ic);
}
else
{
av_read_play(ic);
}
}
#if CONFIG_RTSP_DEMUXER || CONFIG_MMSH_PROTOCOL
if (is->paused &&
(!strcmp(ic->iformat->name, "rtsp") ||
(ic->pb && !strncmp(input_filename, "mmsh:", 5))))
{
/* wait 10 ms to avoid trying to get another packet */
/* XXX: horrible */
SDL_Delay(10);
continue;
}
#endif
if (is->queue_attachments_req)
{
if (is->video_st && is->video_st->disposition & AV_DISPOSITION_ATTACHED_PIC)
{
if ((ret = av_packet_ref(pkt, &is->video_st->attached_pic)) < 0)
goto fail;
packet_queue_put(&is->videoq, pkt);
packet_queue_put_nullpacket(&is->videoq, pkt, is->video_stream);
}
is->queue_attachments_req = 0;
}
/* if the queue are full, no need to read more */
if (infinite_buffer < 1 && (is->audioq.size + is->videoq.size + is->subtitleq.size > MAX_QUEUE_SIZE
|| (stream_has_enough_packets(is->audio_st, is->audio_stream, &is->audioq) &&
stream_has_enough_packets(is->video_st, is->video_stream, &is->videoq) &&
stream_has_enough_packets(is->subtitle_st, is->subtitle_stream, &is->subtitleq))))
{
/* wait 10 ms */
SDL_LockMutex(wait_mutex);
SDL_CondWaitTimeout(is->continue_read_thread, wait_mutex, 10);
SDL_UnlockMutex(wait_mutex);
continue;
}
if (!is->paused &&
(!is->audio_st || (is->auddec.finished == is->audioq.serial && frame_queue_nb_remaining(&is->sampq) == 0)) &&
(!is->video_st || (is->viddec.finished == is->videoq.serial && frame_queue_nb_remaining(&is->pictq) == 0)))
{
if (autoexit)
{
ret = AVERROR_EOF;
goto fail;
}
}
ret = av_read_frame(ic, pkt);
if (ret < 0)
{
if ((ret == AVERROR_EOF || avio_feof(ic->pb)) && !is->eof)
{
if (is->video_stream >= 0)
packet_queue_put_nullpacket(&is->videoq, pkt, is->video_stream);
if (is->audio_stream >= 0)
packet_queue_put_nullpacket(&is->audioq, pkt, is->audio_stream);
if (is->subtitle_stream >= 0)
packet_queue_put_nullpacket(&is->subtitleq, pkt, is->subtitle_stream);
is->eof = 1;
}
if (ic->pb && ic->pb->error)
{
if (autoexit)
goto fail;
else
break;
}
SDL_LockMutex(wait_mutex);
SDL_CondWaitTimeout(is->continue_read_thread, wait_mutex, 10);
SDL_UnlockMutex(wait_mutex);
continue;
}
else
{
is->eof = 0;
}
/* check if packet is in play range specified by user, then queue, otherwise discard */
stream_start_time = ic->streams[pkt->stream_index]->start_time;
pkt_ts = pkt->pts == AV_NOPTS_VALUE ? pkt->dts : pkt->pts;
pkt_in_play_range = 1;
if (pkt->stream_index == is->audio_stream && pkt_in_play_range)
{
packet_queue_put(&is->audioq, pkt);
}
else if (pkt->stream_index == is->video_stream && pkt_in_play_range
&& !(is->video_st->disposition & AV_DISPOSITION_ATTACHED_PIC))
{
packet_queue_put(&is->videoq, pkt);
}
else if (pkt->stream_index == is->subtitle_stream && pkt_in_play_range)
{
packet_queue_put(&is->subtitleq, pkt);
}
else
{
av_packet_unref(pkt);
}
}
ret = 0;
fail:
if (ic && !is->ic)
avformat_close_input(&ic);
av_packet_free(&pkt);
if (ret != 0)
{
SDL_Event event;
event.type = FF_QUIT_EVENT;
event.user.data1 = is;
SDL_PushEvent(&event);
}
SDL_DestroyMutex(wait_mutex);
return 0;
}
static VideoState *stream_open(const char *filename, const AVInputFormat *iformat)
{
VideoState *is;
is = av_mallocz(sizeof(VideoState));
if (!is)
return NULL;
is->last_video_stream = is->video_stream = -1;
is->last_audio_stream = is->audio_stream = -1;
is->last_subtitle_stream = is->subtitle_stream = -1;
is->filename = av_strdup(filename);
if (!is->filename)
goto fail;
is->iformat = iformat;
is->ytop = 0;
is->xleft = 0;
/* start video display */
if (frame_queue_init(&is->pictq, &is->videoq, VIDEO_PICTURE_QUEUE_SIZE, 1) < 0)
goto fail;
if (frame_queue_init(&is->subpq, &is->subtitleq, SUBPICTURE_QUEUE_SIZE, 0) < 0)
goto fail;
if (frame_queue_init(&is->sampq, &is->audioq, SAMPLE_QUEUE_SIZE, 1) < 0)
goto fail;
if (packet_queue_init(&is->videoq) < 0 ||
packet_queue_init(&is->audioq) < 0 ||
packet_queue_init(&is->subtitleq) < 0)
goto fail;
if (!(is->continue_read_thread = SDL_CreateCond()))
{
goto fail;
}
init_clock(&is->vidclk, &is->videoq.serial);
init_clock(&is->audclk, &is->audioq.serial);
init_clock(&is->extclk, &is->extclk.serial);
is->audio_clock_serial = -1;
if (startup_volume < 0)
{
}
if (startup_volume > 100)
{
}
///startup_volume = 80;
startup_volume = av_clip(startup_volume, 0, 100);
startup_volume = av_clip(SDL_MIX_MAXVOLUME * startup_volume / 100, 0, SDL_MIX_MAXVOLUME);
is->audio_volume = startup_volume;
is->muted = 0;
is->av_sync_type = av_sync_type;
is->read_tid = SDL_CreateThread(read_thread, "read_thread", is);
if (!is->read_tid)
{
fail:
stream_close(is);
return NULL;
}
return is;
}
static void refresh_loop_wait_event(VideoState *is, SDL_Event *event)
{
double s = 0;
double remaining_time = 0.0;
SDL_PumpEvents(); ///1.从输入设备收集事件。这个函数更新事件队列和内部输入设备状态
while (!SDL_PeepEvents(event, 1, SDL_GETEVENT, SDL_FIRSTEVENT, SDL_LASTEVENT)) ///2.先调用SDL_PumpEvents()
{
if (remaining_time > 0.0)
{
av_usleep((int64_t)(remaining_time * 1000000.0));///3. sleep=>10000 microseconds == 10ms
}
remaining_time = REFRESH_RATE;
if (is->show_mode != SHOW_MODE_NONE && (!is->paused || is->force_refresh))
{
/// 4. 显示视频帧画面，比如是视频帧为25帧，那么remaining_time就等 1000s/25 = 40ms
video_refresh(is, &remaining_time);
}
SDL_PumpEvents();
}
}
/* handle an event sent by the GUI */
static void event_loop(VideoState *cur_stream)
{
SDL_Event event;
for (;;)
{
refresh_loop_wait_event(cur_stream, &event);
///1. 只保留了退出事件
switch (event.type)
{
case SDL_QUIT:
case FF_QUIT_EVENT:
do_exit(cur_stream);
break;
default:
break;
}
}
}
void RunFFpaly(HWND hwnd, const char* pathInputFile, int w, int h)
{
int flags;
VideoState *is;
init_dynload();
av_log_set_flags(AV_LOG_PRINT_LEVEL);
/* register all codecs, demux and protocols */
#if CONFIG_AVDEVICE
avdevice_register_all();
#endif
avformat_network_init();
signal(SIGINT, sigterm_handler); /* Interrupt (ANSI). */
signal(SIGTERM, sigterm_handler); /* Termination (ANSI). */
if (display_disable)
{
video_disable = 1;
}
flags = SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_TIMER;
if (audio_disable)
{
flags &= ~SDL_INIT_AUDIO;
}
else
{
/* Try to work around an occasional ALSA buffer underflow issue when the
* period size is NPOT due to ALSA resampling by forcing the buffer size. */
if (!SDL_getenv("SDL_AUDIO_ALSA_SET_BUFFER_SIZE"))
SDL_setenv("SDL_AUDIO_ALSA_SET_BUFFER_SIZE", "1", 1);
}
if (display_disable)
{
flags &= ~SDL_INIT_VIDEO;
}
if (SDL_Init(flags))
{
exit(1);
}
SDL_EventState(SDL_SYSWMEVENT, SDL_IGNORE);
SDL_EventState(SDL_USEREVENT, SDL_IGNORE);
if (!display_disable)
{
int flags = SDL_WINDOW_HIDDEN;
if (alwaysontop)
#if SDL_VERSION_ATLEAST(2,0,5)
flags |= SDL_WINDOW_ALWAYS_ON_TOP;
#else
av_log(NULL, AV_LOG_WARNING, "Your SDL version doesn't support SDL_WINDOW_ALWAYS_ON_TOP. Feature will be inactive.\n");
#endif
if (borderless)
{
flags |= SDL_WINDOW_BORDERLESS;
}
else
{
flags |= SDL_WINDOW_RESIZABLE;
}
#ifdef SDL_HINT_VIDEO_X11_NET_WM_BYPASS_COMPOSITOR
SDL_SetHint(SDL_HINT_VIDEO_X11_NET_WM_BYPASS_COMPOSITOR, "0");
#endif
//window = SDL_CreateWindow(program_name, SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, default_width, default_height, flags);
window = SDL_CreateWindowFrom(hwnd);
default_width = w;
default_height = h;
screen_width = w;
screen_height = h;
SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY, "linear");
if (window)
{
renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
if (!renderer)
{
renderer = SDL_CreateRenderer(window, -1, 0);
}
if (renderer)
{
if (!SDL_GetRendererInfo(renderer, &renderer_info))
{
}
}
}
if (!window || !renderer || !renderer_info.num_texture_formats)
{
do_exit(NULL);
}
}
input_filename = pathInputFile;
is = stream_open(input_filename, file_iformat);
if (!is)
{
do_exit(NULL);
}
event_loop(is);
}
感谢大家的支持，如要问题欢迎提问指正。