修改了同步播放ffmpeg问题。并且增加可以放大视频。
// tutorial05.c
// A pedagogical video player that really works!
//
// Code based on FFplay, Copyright (c) 2003 Fabrice Bellard,
// and a tutorial by Martin Bohme (boehme@inb.uni-luebeckREMOVETHIS.de)
// Tested on Gentoo, CVS version 5/01/07 compiled with GCC 4.1.1
// Use
//
// gcc -o tutorial05 tutorial05.c -lavformat -lavcodec -lz -lm `sdl-config --cflags --libs`
// to build (assuming libavformat and libavcodec are correctly installed,
// and assuming you have sdl-config. Please refer to SDL docs for your installation.)
//
// Run using
// tutorial05 myvideofile.mpg
//
// to play the video. #include <libavcodec/avcodec.h>
#include <libavformat/avformat.h> #include <SDL/SDL.h>
#include <SDL/SDL_thread.h>
#include <libswscale/swscale.h>
#define W 1920
#define H 1080
#ifdef __MINGW32__
#undef main /* Prevents SDL from overriding main() */
#endif #include <stdio.h>
#include <math.h> #define SDL_AUDIO_BUFFER_SIZE 1024 #define MAX_AUDIOQ_SIZE (5 * 16 * 1024)
#define MAX_VIDEOQ_SIZE (5 * 256 * 1024) #define AV_SYNC_THRESHOLD 0.01
#define AV_NOSYNC_THRESHOLD 10.0 #define FF_ALLOC_EVENT (SDL_USEREVENT)
#define FF_REFRESH_EVENT (SDL_USEREVENT + 1)
#define FF_QUIT_EVENT (SDL_USEREVENT + 2) #define VIDEO_PICTURE_QUEUE_SIZE 1 typedef struct PacketQueue {
AVPacketList *first_pkt, *last_pkt;
int nb_packets;
int size;
SDL_mutex *mutex;
SDL_cond *cond;
} PacketQueue; typedef struct VideoPicture {
SDL_Overlay *bmp;
int width, height; /* source height & width */
int allocated;
double pts;
} VideoPicture; typedef struct VideoState { AVFormatContext *pFormatCtx;
int videoStream, audioStream; double audio_clock;
AVStream *audio_st;
PacketQueue audioq;
uint8_t audio_buf[(AVCODEC_MAX_AUDIO_FRAME_SIZE * ) / ];
unsigned int audio_buf_size;
unsigned int audio_buf_index;
AVPacket audio_pkt;
uint8_t *audio_pkt_data;
int audio_pkt_size;
int audio_hw_buf_size;
double frame_timer;
double frame_last_pts;
double frame_last_delay;
double video_clock; ///<pts of last decoded frame / predicted pts of next decoded frame
AVStream *video_st;
PacketQueue videoq; VideoPicture pictq[VIDEO_PICTURE_QUEUE_SIZE];
int pictq_size, pictq_rindex, pictq_windex;
SDL_mutex *pictq_mutex;
SDL_cond *pictq_cond; SDL_Thread *parse_tid;
SDL_Thread *video_tid; char filename[];
int quit;
} VideoState; SDL_Surface *screen; /* Since we only have one decoding thread, the Big Struct
can be global in case we need it. */
VideoState *global_video_state; void packet_queue_init(PacketQueue *q) {
memset(q, , sizeof(PacketQueue));
q->mutex = SDL_CreateMutex();
q->cond = SDL_CreateCond();
}
int packet_queue_put(PacketQueue *q, AVPacket *pkt) { AVPacketList *pkt1;
if(av_dup_packet(pkt) < ) {
return -;
}
pkt1 = av_malloc(sizeof(AVPacketList));
if (!pkt1)
return -;
pkt1->pkt = *pkt;
pkt1->next = NULL; SDL_LockMutex(q->mutex); if (!q->last_pkt)
q->first_pkt = pkt1;
else
q->last_pkt->next = pkt1;
q->last_pkt = pkt1;
q->nb_packets++;
q->size += pkt1->pkt.size;
SDL_CondSignal(q->cond); SDL_UnlockMutex(q->mutex);
return ;
}
static int packet_queue_get(PacketQueue *q, AVPacket *pkt, int block)
{
AVPacketList *pkt1;
int ret; SDL_LockMutex(q->mutex); for(;;) { if(global_video_state->quit) {
ret = -;
break;
} pkt1 = q->first_pkt;
if (pkt1) {
q->first_pkt = pkt1->next;
if (!q->first_pkt)
q->last_pkt = NULL;
q->nb_packets--;
q->size -= pkt1->pkt.size;
*pkt = pkt1->pkt;
av_free(pkt1);
ret = ;
break;
} else if (!block) {
ret = ;
break;
} else {
SDL_CondWait(q->cond, q->mutex);
}
}
SDL_UnlockMutex(q->mutex);
return ret;
}
double get_audio_clock(VideoState *is) {
double pts;
int hw_buf_size, bytes_per_sec, n; pts = is->audio_clock; /* maintained in the audio thread */
hw_buf_size = is->audio_buf_size - is->audio_buf_index;
bytes_per_sec = ;
n = is->audio_st->codec->channels * ;
if(is->audio_st) {
bytes_per_sec = is->audio_st->codec->sample_rate * n;
}
if(bytes_per_sec) {
pts -= (double)hw_buf_size / bytes_per_sec;
}
return pts;
} int audio_decode_frame(VideoState *is, uint8_t *audio_buf, int buf_size, double *pts_ptr) { int len1, data_size, n;
AVPacket *pkt = &is->audio_pkt;
double pts; for(;;) {
while(is->audio_pkt_size > ) {
data_size = buf_size;
len1 = avcodec_decode_audio2(is->audio_st->codec,
(int16_t *)audio_buf, &data_size,
is->audio_pkt_data, is->audio_pkt_size);
if(len1 < ) {
/* if error, skip frame */
is->audio_pkt_size = ;
break;
}
is->audio_pkt_data += len1;
is->audio_pkt_size -= len1;
if(data_size <= ) {
/* No data yet, get more frames */
continue;
}
pts = is->audio_clock;
*pts_ptr = pts;
n = * is->audio_st->codec->channels;
is->audio_clock += (double)data_size /
(double)(n * is->audio_st->codec->sample_rate); /* We have data, return it and come back for more later */
return data_size;
}
if(pkt->data)
av_free_packet(pkt); if(is->quit) {
return -;
}
/* next packet */
if(packet_queue_get(&is->audioq, pkt, ) < ) {
return -;
}
is->audio_pkt_data = pkt->data;
is->audio_pkt_size = pkt->size;
/* if update, update the audio clock w/pts */
if(pkt->pts != AV_NOPTS_VALUE) {
is->audio_clock = av_q2d(is->audio_st->time_base)*pkt->pts;
} }
} void audio_callback(void *userdata, Uint8 *stream, int len) { VideoState *is = (VideoState *)userdata;
int len1, audio_size;
double pts; while(len > ) {
if(is->audio_buf_index >= is->audio_buf_size) {
/* We have already sent all our data; get more */
audio_size = audio_decode_frame(is, is->audio_buf, sizeof(is->audio_buf), &pts);
if(audio_size < ) {
/* If error, output silence */
is->audio_buf_size = ;
memset(is->audio_buf, , is->audio_buf_size);
} else {
is->audio_buf_size = audio_size;
}
is->audio_buf_index = ;
}
len1 = is->audio_buf_size - is->audio_buf_index;
if(len1 > len)
len1 = len;
memcpy(stream, (uint8_t *)is->audio_buf + is->audio_buf_index, len1);
len -= len1;
stream += len1;
is->audio_buf_index += len1;
}
} static Uint32 sdl_refresh_timer_cb(Uint32 interval, void *opaque) {
SDL_Event event;
event.type = FF_REFRESH_EVENT;
event.user.data1 = opaque;
SDL_PushEvent(&event);
return ; /* 0 means stop timer */
} /* schedule a video refresh in 'delay' ms */
static void schedule_refresh(VideoState *is, int delay) {
SDL_AddTimer(delay, sdl_refresh_timer_cb, is);
} void video_display(VideoState *is) { SDL_Rect rect;
VideoPicture *vp;
AVPicture pict;
float aspect_ratio;
int w, h, x, y;
int i; vp = &is->pictq[is->pictq_rindex];
if(vp->bmp) {
if(is->video_st->codec->sample_aspect_ratio.num == ) {
aspect_ratio = ;
} else {
aspect_ratio = av_q2d(is->video_st->codec->sample_aspect_ratio) *
is->video_st->codec->width / is->video_st->codec->height;
}
if(aspect_ratio <= 0.0) {
aspect_ratio = (float)is->video_st->codec->width /
(float)is->video_st->codec->height;
}
h = screen->h;
w = ((int)rint(h * aspect_ratio)) & -;
if(w > screen->w) {
w = screen->w;
h = ((int)rint(w / aspect_ratio)) & -;
}
x = (screen->w - w) / ;
y = (screen->h - h) / ;
//x=0;y=0;w=0;h=0;
rect.x = x;
rect.y = y;
rect.w = w;
rect.h = h;
SDL_DisplayYUVOverlay(vp->bmp, &rect);
}
} void video_refresh_timer(void *userdata) { VideoState *is = (VideoState *)userdata;
VideoPicture *vp;
double actual_delay, delay, sync_threshold, ref_clock, diff; if(is->video_st) {
if(is->pictq_size == ) {
schedule_refresh(is, );
} else {
vp = &is->pictq[is->pictq_rindex]; delay = vp->pts - is->frame_last_pts; /* the pts from last time */
if(delay <= || delay >= 1.0) {
/* if incorrect delay, use previous one */
delay = is->frame_last_delay;
}
/* save for next time */
is->frame_last_delay = delay;
is->frame_last_pts = vp->pts; /* update delay to sync to audio */
ref_clock = get_audio_clock(is);
diff = vp->pts - ref_clock; /* Skip or repeat the frame. Take delay into account
FFPlay still doesn't "know if this is the best guess." */
sync_threshold = (delay > AV_SYNC_THRESHOLD) ? delay : AV_SYNC_THRESHOLD;
if(fabs(diff) < AV_NOSYNC_THRESHOLD) {
if(diff <= -sync_threshold) {
delay = ;
} else if(diff >= sync_threshold) {
delay = * delay;
}
}
is->frame_timer += delay;
/* computer the REAL delay */
actual_delay = is->frame_timer - (av_gettime() / 1000000.0);
if(actual_delay < 0.010) {
/* Really it should skip the picture instead */
actual_delay = 0.010;
}
schedule_refresh(is, (int)(actual_delay * + 0.5));
/* show the picture! */
video_display(is); /* update queue for next picture! */
if(++is->pictq_rindex == VIDEO_PICTURE_QUEUE_SIZE) {
is->pictq_rindex = ;
}
SDL_LockMutex(is->pictq_mutex);
is->pictq_size--;
SDL_CondSignal(is->pictq_cond);
SDL_UnlockMutex(is->pictq_mutex);
}
} else {
schedule_refresh(is, );
}
} void alloc_picture(void *userdata) { VideoState *is = (VideoState *)userdata;
VideoPicture *vp; vp = &is->pictq[is->pictq_windex];
if(vp->bmp) {
// we already have one make another, bigger/smaller
SDL_FreeYUVOverlay(vp->bmp);
}
// Allocate a place to put our YUV image on that screen
vp->bmp = SDL_CreateYUVOverlay(W,
H,
SDL_YV12_OVERLAY,
screen);
vp->width = W;
vp->height = H; SDL_LockMutex(is->pictq_mutex);
vp->allocated = ;
SDL_CondSignal(is->pictq_cond);
SDL_UnlockMutex(is->pictq_mutex); } int queue_picture(VideoState *is, AVFrame *pFrame, double pts) { VideoPicture *vp;
int dst_pix_fmt;
AVPicture pict; /* wait until we have space for a new pic */
SDL_LockMutex(is->pictq_mutex);
while(is->pictq_size >= VIDEO_PICTURE_QUEUE_SIZE &&
!is->quit) {
SDL_CondWait(is->pictq_cond, is->pictq_mutex);
}
SDL_UnlockMutex(is->pictq_mutex); if(is->quit)
return -; // windex is set to 0 initially
vp = &is->pictq[is->pictq_windex]; /* allocate or resize the buffer! */
if(!vp->bmp ||
vp->width != is->video_st->codec->width ||
vp->height != is->video_st->codec->height) {
SDL_Event event; vp->allocated = ;
/* we have to do it in the main thread */
event.type = FF_ALLOC_EVENT;
event.user.data1 = is;
SDL_PushEvent(&event); /* wait until we have a picture allocated */
SDL_LockMutex(is->pictq_mutex);
while(!vp->allocated && !is->quit) {
SDL_CondWait(is->pictq_cond, is->pictq_mutex);
}
SDL_UnlockMutex(is->pictq_mutex);
if(is->quit) {
return -;
}
}
/* We have a place to put our picture on the queue */
/* If we are skipping a frame, do we set this to null
but still return vp->allocated = 1? */ if(vp->bmp) { SDL_LockYUVOverlay(vp->bmp); dst_pix_fmt = PIX_FMT_YUV420P;
/* point pict at the queue */ pict.data[] = vp->bmp->pixels[];
pict.data[] = vp->bmp->pixels[];
pict.data[] = vp->bmp->pixels[]; pict.linesize[] = vp->bmp->pitches[];
pict.linesize[] = vp->bmp->pitches[];
pict.linesize[] = vp->bmp->pitches[]; // Convert the image into YUV format that SDL uses
// img_convert(&pict, dst_pix_fmt,
// (AVPicture *)pFrame, is->video_st->codec->pix_fmt,
// is->video_st->codec->width, is->video_st->codec->height); #if 1//zhibin static struct SwsContext *img_convert_ctx; img_convert_ctx = sws_getContext(is->video_st->codec->width, is->video_st->codec->height, is->video_st->codec->pix_fmt, W,H,
// PIX_FMT_RGB24,
PIX_FMT_YUV420P, SWS_BICUBIC, NULL, NULL, NULL );
sws_scale(img_convert_ctx, (const uint8_t* const *) pFrame->data, pFrame->linesize, , is->video_st->codec->height, pict.data,
pict.linesize);
#endif SDL_UnlockYUVOverlay(vp->bmp);
vp->pts = pts; /* now we inform our display thread that we have a pic ready */
if(++is->pictq_windex == VIDEO_PICTURE_QUEUE_SIZE) {
is->pictq_windex = ;
}
SDL_LockMutex(is->pictq_mutex);
is->pictq_size++;
SDL_UnlockMutex(is->pictq_mutex);
}
return ;
} double synchronize_video(VideoState *is, AVFrame *src_frame, double pts) { double frame_delay; if(pts != ) {
/* if we have pts, set video clock to it */
is->video_clock = pts;
} else {
/* if we aren't given a pts, set it to the clock */
pts = is->video_clock;
}
/* update the video clock */
frame_delay = av_q2d(is->video_st->codec->time_base);
/* if we are repeating a frame, adjust clock accordingly */
frame_delay += src_frame->repeat_pict * (frame_delay * 0.5);
is->video_clock += frame_delay;
return pts;
}
uint64_t global_video_pkt_pts = AV_NOPTS_VALUE; /* These are called whenever we allocate a frame
* buffer. We use this to store the global_pts in
* a frame at the time it is allocated.
*/
int our_get_buffer(struct AVCodecContext *c, AVFrame *pic) {
int ret = avcodec_default_get_buffer(c, pic);
uint64_t *pts = av_malloc(sizeof(uint64_t));
*pts = global_video_pkt_pts;
pic->opaque = pts;
return ret;
}
void our_release_buffer(struct AVCodecContext *c, AVFrame *pic) {
if(pic) av_freep(&pic->opaque);
avcodec_default_release_buffer(c, pic);
} int video_thread(void *arg) {
VideoState *is = (VideoState *)arg;
AVPacket pkt1, *packet = &pkt1;
int len1, frameFinished;
AVFrame *pFrame;
double pts; pFrame = avcodec_alloc_frame(); for(;;) {
if(packet_queue_get(&is->videoq, packet, ) < ) {
// means we quit getting packets
break;
}
pts = ; // Save global pts to be stored in pFrame in first call
global_video_pkt_pts = packet->pts;
// Decode video frame
len1 = avcodec_decode_video(is->video_st->codec, pFrame, &frameFinished,
packet->data, packet->size);
if(packet->dts == AV_NOPTS_VALUE
&& pFrame->opaque && *(uint64_t*)pFrame->opaque != AV_NOPTS_VALUE) {
pts = *(uint64_t *)pFrame->opaque;
} else if(packet->dts != AV_NOPTS_VALUE) {
pts = packet->dts;
} else {
pts = ;
}
pts *= av_q2d(is->video_st->time_base); // Did we get a video frame?
if(frameFinished) {
pts = synchronize_video(is, pFrame, pts);
if(queue_picture(is, pFrame, pts) < ) {
break;
}
}
av_free_packet(packet);
}
av_free(pFrame);
return ;
} int stream_component_open(VideoState *is, int stream_index) { AVFormatContext *pFormatCtx = is->pFormatCtx;
AVCodecContext *codecCtx;
AVCodec *codec;
SDL_AudioSpec wanted_spec, spec; if(stream_index < || stream_index >= pFormatCtx->nb_streams) {
return -;
} // Get a pointer to the codec context for the video stream
codecCtx = pFormatCtx->streams[stream_index]->codec; if(codecCtx->codec_type == CODEC_TYPE_AUDIO) {
// Set audio settings from codec info
wanted_spec.freq = codecCtx->sample_rate;
wanted_spec.format = AUDIO_S16SYS;
wanted_spec.channels = codecCtx->channels;
wanted_spec.silence = ;
wanted_spec.samples = SDL_AUDIO_BUFFER_SIZE;
wanted_spec.callback = audio_callback;
wanted_spec.userdata = is; if(SDL_OpenAudio(&wanted_spec, &spec) < ) {
fprintf(stderr, "SDL_OpenAudio: %s\n", SDL_GetError());
return -;
}
is->audio_hw_buf_size = spec.size;
}
codec = avcodec_find_decoder(codecCtx->codec_id); if(!codec || (avcodec_open(codecCtx, codec) < )) {
fprintf(stderr, "Unsupported codec!\n");
return -;
} switch(codecCtx->codec_type) {
case CODEC_TYPE_AUDIO:
is->audioStream = stream_index;
is->audio_st = pFormatCtx->streams[stream_index];
is->audio_buf_size = ;
is->audio_buf_index = ;
memset(&is->audio_pkt, , sizeof(is->audio_pkt));
packet_queue_init(&is->audioq);
SDL_PauseAudio();
break;
case CODEC_TYPE_VIDEO:
is->videoStream = stream_index;
is->video_st = pFormatCtx->streams[stream_index]; is->frame_timer = (double)av_gettime() / 1000000.0;
is->frame_last_delay = 40e-; packet_queue_init(&is->videoq);
is->video_tid = SDL_CreateThread(video_thread, is);
codecCtx->get_buffer = our_get_buffer;
codecCtx->release_buffer = our_release_buffer;
break;
default:
break;
} } int decode_interrupt_cb(void) {
return (global_video_state && global_video_state->quit);
} int decode_thread(void *arg) { VideoState *is = (VideoState *)arg;
AVFormatContext *pFormatCtx;
AVPacket pkt1, *packet = &pkt1; int video_index = -;
int audio_index = -;
int i; is->videoStream=-;
is->audioStream=-; global_video_state = is;
// will interrupt blocking functions if we quit!
url_set_interrupt_cb(decode_interrupt_cb); // Open video file
if(av_open_input_file(&pFormatCtx, is->filename, NULL, , NULL)!=)
return -; // Couldn't open file is->pFormatCtx = pFormatCtx; // Retrieve stream information
if(av_find_stream_info(pFormatCtx)<)
return -; // Couldn't find stream information // Dump information about file onto standard error
dump_format(pFormatCtx, , is->filename, ); // Find the first video stream for(i=; i<pFormatCtx->nb_streams; i++) {
if(pFormatCtx->streams[i]->codec->codec_type==CODEC_TYPE_VIDEO &&
video_index < ) {
video_index=i;
}
if(pFormatCtx->streams[i]->codec->codec_type==CODEC_TYPE_AUDIO &&
audio_index < ) {
audio_index=i;
}
}
if(audio_index >= ) {
stream_component_open(is, audio_index);
}
if(video_index >= ) {
stream_component_open(is, video_index);
} if(is->videoStream < || is->audioStream < ) {
fprintf(stderr, "%s: could not open codecs\n", is->filename);
goto fail;
} // main decode loop for(;;) {
if(is->quit) {
break;
}
// seek stuff goes here
if(is->audioq.size > MAX_AUDIOQ_SIZE ||
is->videoq.size > MAX_VIDEOQ_SIZE) {
SDL_Delay();
continue;
}
if(av_read_frame(is->pFormatCtx, packet) < ) {
if(url_ferror(&pFormatCtx->pb) == ) {
SDL_Delay(); /* no error; wait for user input */
continue;
} else {
break;
}
}
// Is this a packet from the video stream?
if(packet->stream_index == is->videoStream) {
packet_queue_put(&is->videoq, packet);
} else if(packet->stream_index == is->audioStream) {
packet_queue_put(&is->audioq, packet);
} else {
av_free_packet(packet);
}
}
/* all done - wait for it */
while(!is->quit) {
SDL_Delay();
} fail:
{
SDL_Event event;
event.type = FF_QUIT_EVENT;
event.user.data1 = is;
SDL_PushEvent(&event);
}
return ;
} int main_sync(int argc, char *argv[]) { SDL_Event event; VideoState *is; is = av_mallocz(sizeof(VideoState));
/*
if(argc < 2) {
fprintf(stderr, "Usage: test <file>\n");
exit(1);
}*/
// Register all formats and codecs
av_register_all(); if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_TIMER)) {
fprintf(stderr, "Could not initialize SDL - %s\n", SDL_GetError());
exit();
} // Make a screen to put our video
#ifndef __DARWIN__
screen = SDL_SetVideoMode(W, H, , );
#else
screen = SDL_SetVideoMode(, , , );
#endif
if(!screen) {
fprintf(stderr, "SDL: could not set video mode - exiting\n");
exit();
} strncpy(is->filename, "test.mp4", sizeof(is->filename)); is->pictq_mutex = SDL_CreateMutex();
is->pictq_cond = SDL_CreateCond(); schedule_refresh(is, ); is->parse_tid = SDL_CreateThread(decode_thread, is);
if(!is->parse_tid) {
av_free(is);
return -;
}
for(;;) { SDL_WaitEvent(&event);
switch(event.type) {
case FF_QUIT_EVENT:
case SDL_QUIT:
is->quit = ;
SDL_Quit();
exit();
break;
case FF_ALLOC_EVENT:
alloc_picture(event.user.data1);
break;
case FF_REFRESH_EVENT:
video_refresh_timer(event.user.data1);
break;
default:
break;
}
}
return ; }
