音视频流::ffplay::tutorial04

来源：互联网发布：淘宝开店协议怎么查编辑：程序博客网时间：2024/05/16 09:55

转自：

http://blog.chinaunix.net/uid-24203478-id-3172725.html

所用的版本为ffmpeg 0.6.3

编译命令：
gcc -o tutorial04 tutorial04.c -lavformat -lavcodec -lz -lm -lswscale `sdl-config --cflags --libs

转自：

http://blog.chinaunix.net/uid-24203478-id-3172725.html

所用的版本为ffmpeg 0.6.3

编译命令：
gcc -o tutorial04 tutorial04.c -lavformat -lavcodec -lz -lm -lswscale `sdl-config --cflags --libs

[cpp] view plaincopy

#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
#include <libswscale/swscale.h>
#include <SDL.h>
#include <SDL_thread.h>
#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 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
static struct SwsContext *img_convert_ctx;
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;
int allocated;
} VideoPicture;
typedef struct VideoState {
AVFormatContext *pFormatCtx;
int videoStream, audioStream;
AVStream *audio_st;
PacketQueue audioq;
uint8_t audio_buf[(AVCODEC_MAX_AUDIO_FRAME_SIZE * 3)/2];
unsigned int audio_buf_size;
unsigned int audio_buf_index;
AVPacket audio_pkt;
uint8_t *audio_pkt_data;
int *audio_pkt_size;
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[1024];
int quit;
} VideoState;
SDL_Surface *screen;
VideoState *global_video_state;
void packet_queue_init(PacketQueue *q) {
memset(q, 0, 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) < 0) {
return -1;
}
pkt1 = av_malloc(sizeof(AVPacketList));
if (!pkt1) {
return -1;
}
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 0;
}
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 = -1;
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 = 1;
break;
} else if (!block) {
ret = 0;
break;
} else {
SDL_CondWait(q->cond, q->mutex);
}
}
SDL_UnlockMutex(q->mutex);
return ret;
}
int audio_decodec_frame(VideoState *is, uint8_t *audio_buf, int buf_size) {
int len1, data_size;
AVPacket *pkt = &is->audio_pkt;
for (;;) {
while(is->audio_pkt_size > 0) {
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 < 0) {
is->audio_pkt_size = 0;
break;
}
is->audio_pkt_data += len1;
is->audio_pkt_size -= len1;
if (data_size <= 0) {
continue;
}
return data_size;
}
if (pkt->data) {
av_free_packet(pkt);
}
if (is->quit) {
return -1;
}
if (packet_queue_get(&is->audioq, pkt, 1) < 0) {
return -1;
}
is->audio_pkt_data = pkt->data;
is->audio_pkt_size = pkt->size;
}
}
void audio_callback(void *userdata, Uint8 *stream, int len) {
VideoState *is = (VideoState *)userdata;
int len1, audio_size;
while(len > 0) {
if (is->audio_buf_index >= is->audio_buf_size) {
audio_size = audio_decodec_frame(is, is->audio_buf, sizeof(is->audio_buf));
if (audio_size < 0) {
is->audio_buf_size = 1024;
memset(is->audio_buf, 0, is->audio_buf_size);
} else {
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;
}
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;
}
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 == 0) {
aspect_ratio = 0;
} 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)) & -3;
if (w > screen->w) {
w = screen->w;
h = ((int)rint(w / aspect_ratio)) & -3;
}
x = (screen->w - w) / 2;
y = (screen->h - h) / 2;
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;
if (is->video_st) {
if (is->pictq_size == 0) {
schedule_refresh(is ,1);
} else {
vp = &is->pictq[is->pictq_rindex];
schedule_refresh(is, 80);
video_display(is);
if (++is->pictq_rindex == VIDEO_PICTURE_QUEUE_SIZE) {
is->pictq_rindex = 0;
}
SDL_LockMutex(is->pictq_mutex);
is->pictq_size--;
SDL_CondSignal(is->pictq_cond);
SDL_UnlockMutex(is->pictq_mutex);
}
} else {
schedule_refresh(is, 100);
}
}
void alloc_picture(void *userdata) {
VideoState *is = (VideoState *)userdata;
VideoPicture *vp;
vp = &is->pictq[is->pictq_windex];
if (vp->bmp) {
SDL_FreeYUVOverlay(vp->bmp);
}
vp->bmp = SDL_CreateYUVOverlay(is->video_st->codec->width,
is->video_st->codec->height,
SDL_YV12_OVERLAY,
screen);
vp->width = is->video_st->codec->width;
vp->height = is->video_st->codec->height;
SDL_LockMutex(is->pictq_mutex);
vp->allocated = 1;
SDL_CondSignal(is->pictq_cond);
SDL_UnlockMutex(is->pictq_mutex);
}
int queue_picture(VideoState *is, AVFrame *pFrame) {
VideoPicture *vp;
int dst_pix_fmt;
AVPicture pict;
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 -1;
}
vp = &is->pictq[is->pictq_windex];
if (!vp->bmp || vp->width != is->video_st->codec->width || vp->height != is->video_st->codec->height) {
SDL_Event event;
vp->allocated = 0;
event.type = FF_ALLOC_EVENT;
event.user.data1 = is;
SDL_PushEvent(&event);
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 -1;
}
}
if (vp->bmp) {
SDL_LockYUVOverlay(vp->bmp);
dst_pix_fmt = PIX_FMT_YUV420P;
pict.data[0] = vp->bmp->pixels[0];
pict.data[1] = vp->bmp->pixels[2];
pict.data[2] = vp->bmp->pixels[1];
pict.linesize[0] = vp->bmp->pitches[0];
pict.linesize[1] = vp->bmp->pitches[2];
pict.linesize[2] = vp->bmp->pitches[1];
//*
sws_scale(img_convert_ctx,
pFrame->data,
pFrame->linesize, 0,
is->video_st->codec->height,
pict.data,
pict.linesize);
//*/
SDL_UnlockYUVOverlay(vp->bmp);
if (++is->pictq_windex == VIDEO_PICTURE_QUEUE_SIZE) {
is->pictq_windex = 0;
}
SDL_LockMutex(is->pictq_mutex);
is->pictq_size++;
SDL_UnlockMutex(is->pictq_mutex);
}
return 0;
}
int video_thread(void *arg) {
VideoState *is = (VideoState *)arg;
AVPacket pkt1, *packet = &pkt1;
int len1, frameFinished;
AVFrame *pFrame;
pFrame = avcodec_alloc_frame();
for (;;) {
if (packet_queue_get(&is->videoq, packet, 1) < 0) {
break;
}
len1 = avcodec_decode_video(is->video_st->codec, pFrame, &frameFinished, packet->data, packet->size);
if (frameFinished) {
if (queue_picture(is, pFrame) < 0) {
break;
}
}
av_free_packet(packet);
}
av_free(pFrame);
return 0;
}
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 < 0 || stream_index >= pFormatCtx->nb_streams) {
return -1;
}
codecCtx = pFormatCtx->streams[stream_index]->codec;
///*
img_convert_ctx = sws_getContext(codecCtx->width,
codecCtx->height,
codecCtx->pix_fmt,
codecCtx->width,
codecCtx->height,
PIX_FMT_YUV420P,
SWS_BICUBIC,
NULL, NULL, NULL);
//*/
if (codecCtx->codec_type == CODEC_TYPE_AUDIO) {
wanted_spec.freq = codecCtx->sample_rate;
wanted_spec.format = AUDIO_S16SYS;
wanted_spec.channels = codecCtx->channels;
wanted_spec.silence = 0;
wanted_spec.samples = SDL_AUDIO_BUFFER_SIZE;
wanted_spec.callback = audio_callback;
wanted_spec.userdata = is;
if (SDL_OpenAudio(&wanted_spec, &spec) < 0) {
fprintf(stderr,"SDL_OpenAudio: %s\n", SDL_GetError());
return -1;
}
}
codec = avcodec_find_decoder(codecCtx->codec_id);
if (!codec || (avcodec_open(codecCtx, codec)) < 0) {
fprintf(stderr, "Unsupported codec!\n");
return -1;
}
switch(codecCtx->codec_type) {
case CODEC_TYPE_AUDIO:
is->audioStream = stream_index;
is->audio_st = pFormatCtx->streams[stream_index];
is->audio_buf_size = 0;
is->audio_buf_index = 0;
memset(&is->audio_pkt, 0, sizeof(is->audio_pkt));
packet_queue_init(&is->audioq);
SDL_PauseAudio(0);
break;
case CODEC_TYPE_VIDEO:
is->videoStream = stream_index;
is->video_st = pFormatCtx->streams[stream_index];
packet_queue_init(&is->videoq);
is->video_tid = SDL_CreateThread(video_thread, is);
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 = -1;
int audio_index = -1;
int i;
is->videoStream = -1;
is->audioStream = -1;
global_video_state = is;
url_set_interrupt_cb(decode_interrupt_cb);
if (av_open_input_file(&pFormatCtx, is->filename, NULL, 0, NULL) != 0) {
return -1;
}
is->pFormatCtx = pFormatCtx;
if (av_find_stream_info(pFormatCtx) < 0) {
return -1;
}
dump_format(pFormatCtx, 0, is->filename, 0);
for (i=0; i<pFormatCtx->nb_streams; i++) {
if (pFormatCtx->streams[i]->codec->codec_type == CODEC_TYPE_VIDEO && video_index < 0) {
video_index = i;
}
if (pFormatCtx->streams[i]->codec->codec_type == CODEC_TYPE_AUDIO && audio_index < 0) {
audio_index = i;
}
}
if (audio_index >= 0) {
stream_component_open(is, audio_index);
}
if (video_index >= 0) {
stream_component_open(is, video_index);
}
if (is->videoStream < 0 || is->audioStream < 0) {
fprintf(stderr, "%s: could not open codecs\n", is->filename);
goto fail;
}
for (;;) {
if (is->quit) {
break;
}
if (is->audioq.size > MAX_AUDIOQ_SIZE || is->videoq.size > MAX_VIDEOQ_SIZE) {
SDL_Delay(10);
continue;
}
if (av_read_frame(is->pFormatCtx, packet) < 0) {
if (url_ferror(&pFormatCtx->pb) == 0) {
SDL_Delay(100);
continue;
} else {
break;
}
}
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);
}
}
while (!is->quit) {
SDL_Delay(100);
}
fail:
if (1) {
SDL_Event event;
event.type = FF_QUIT_EVENT;
event.user.data1 = is;
SDL_PushEvent(&event);
}
return 0;
}
int main(int argc, char *argv[]) {
SDL_Event event;
VideoState *is;
is = av_mallocz(sizeof(VideoState));
if (argc < 2) {
fprintf(stderr, "Isage: test <file>\n");
exit(1);
}
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(1);
}
screen = SDL_SetVideoMode(640, 480, 24, 0);
if (!screen) {
fprintf(stderr, "SDL: could not set video mode - exiting\n");
exit(1);
}
av_strlcpy(is->filename, argv[1], sizeof(is->filename));
is->pictq_mutex = SDL_CreateMutex();
is->pictq_cond = SDL_CreateCond();
schedule_refresh(is, 40);
is->parse_tid = SDL_CreateThread(decode_thread, is);
if (!is->parse_tid) {
av_free(is);
return -1;
}
for (;;) {
SDL_WaitEvent(&event);
switch(event.type) {
case FF_QUIT_EVENT:
case SDL_QUIT:
is->quit = 1;
SDL_Quit();
return 0;
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 0;
}