hi all,
i am using an updated (latest ffmpeg, SDL 1.2.15, MSVC++) version of
Dranger's tutorial and basically, it works fine.
now, i started to extend it for to play multiple 10-seconds video segments
(gapless), what also works out as long as i don't fill the audio queue.
but if i do so, as soon it switches to the second segment, i just get some
fast techno-style noise, but video is still running.
here is the code of the main loop:
main(...)
{
...
while (1)
{
while(av_read_frame(pFormatCtx, &packet) >= 0)
{
if(packet.stream_index == videoStream)
{
avcodec_decode_video2(pCodecCtx, pFrame,
&frameFinished, &packet);
if(frameFinished)
{
SDL_LockYUVOverlay(bmp);
AVPicture pict;
pict.data[0] = bmp->pixels[0];
pict.data[1] = bmp->pixels[2];
pict.data[2] = bmp->pixels[1];
pict.linesize[0] = bmp->pitches[0];
pict.linesize[1] = bmp->pitches[2];
pict.linesize[2] = bmp->pitches[1];
sws_scale(ctx, pFrame->data,
pFrame->linesize, 0, h,pict.data,
pict.linesize);
//av_picture_copy( (AVPicture*)&pict,
(AVPicture*)pFrame,
pCodecCtx->pix_fmt, w, h);
SDL_UnlockYUVOverlay(bmp);
rect.x = 0;
rect.y = 0;
rect.w = w;
rect.h = h;
SDL_DisplayYUVOverlay(bmp, &rect);
SDL_Delay(40);
}
}
else if(packet.stream_index == audioStream)
{
packet_queue_put(&audioq, &packet);
}
else
{
av_free_packet(&packet);
}
SDL_PollEvent(&event);
switch(event.type)
{
case SDL_QUIT:
quit = 1;
break;
case SDL_KEYUP:
if (event.key.keysym.sym == SDLK_ESCAPE)
quit = 1;
break;
default:
break;
}
if (quit)
{
SDL_Quit();
exit(0);
}
}
av_free(buffer);
av_free(pFrameRGB);
av_free(pFrame);
avcodec_close(pCodecCtx);
av_close_input_file(pFormatCtx);
pFormatCtx = avformat_alloc_context();
fileNo++;
if (fileNo == 10)
break;
//switch to the next segment file
char szFilename[5];
sprintf(szFilename, "%d.asf", fileNo);
if(avformat_open_input(&pFormatCtx, szFilename, NULL, NULL)!=0)
return -1; // Couldn't open file
//initializing audio and video as done before entering the
while loop...
aCodecCtx = pFormatCtx->streams[audioStream]->codec;
wanted_spec.freq = aCodecCtx->sample_rate;
wanted_spec.format = AUDIO_S16SYS;
wanted_spec.channels = aCodecCtx->channels;
wanted_spec.silence = 0;
wanted_spec.samples = SDL_AUDIO_BUFFER_SIZE;
wanted_spec.callback = audio_callback;
wanted_spec.userdata = aCodecCtx;
SDL_OpenAudio(&wanted_spec, &spec);
aCodec = avcodec_find_decoder(aCodecCtx->codec_id);
avcodec_open(aCodecCtx, aCodec);
packet_queue_init(&audioq);
SDL_PauseAudio(0);
pCodecCtx=pFormatCtx->streams[videoStream]->codec;
pCodec=avcodec_find_decoder(pCodecCtx->codec_id);
avcodec_open(pCodecCtx, pCodec);
pFrame=avcodec_alloc_frame();
pFrameRGB=avcodec_alloc_frame();
//numBytes = avpicture_get_size(PIX_FMT_RGB24, pCodecCtx->width,
pCodecCtx->height);
buffer = (uint8_t *)av_malloc(numBytes*sizeof(uint8_t));
}
...
}
int packet_queue_put(PacketQueue *q, AVPacket *pkt)
{
AVPacketList *pkt1;
if(av_dup_packet(pkt) < 0)
return -1;
//check mirko:
pkt1 = (AVPacketList *)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;
}
can anybody give me a hint whats going wrong ?
- or -
is anyone interested in a freelance job ?
todo's would be:
- based on the code above, gapless playing of video/audio of multiple video
segments.
- video output on any given windows form (e.g. a panel) by using
SDL_GetWMInfo(SDL_SysWMinfo *info); // SDL_syswm.h
- other things like pause, stop, play, volume control
i will appreciate any question about that!
regards,
Gerald
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