static int stream_component_open(VideoState *is, int stream_index) { AVFormatContext *ic = is->ic; AVCodecContext *enc; AVCodec *codec; SDL_AudioSpec wanted_spec, spec; if (stream_index < 0 || stream_index >= ic->nb_streams) return -1; enc = ic->streams[stream_index]->codec; /* prepare audio output */ if (enc->codec_type == CODEC_TYPE_AUDIO) { if (enc->channels > 0) { enc->request_channels = FFMIN(2, enc->channels); } else { enc->request_channels = 2; } } codec = avcodec_find_decoder(enc->codec_id); enc->debug_mv = debug_mv; enc->debug = debug; enc->workaround_bugs = workaround_bugs; enc->lowres = lowres; if(lowres) enc->flags |= CODEC_FLAG_EMU_EDGE; enc->idct_algo= idct; if(fast) enc->flags2 |= CODEC_FLAG2_FAST; enc->skip_frame= skip_frame; enc->skip_idct= skip_idct; enc->skip_loop_filter= skip_loop_filter; enc->error_recognition= error_recognition; enc->error_concealment= error_concealment; avcodec_thread_init(enc, thread_count); set_context_opts(enc, avcodec_opts[enc->codec_type], 0); if (!codec || avcodec_open(enc, codec) < 0) return -1; /* prepare audio output */ if (enc->codec_type == CODEC_TYPE_AUDIO) { wanted_spec.freq = enc->sample_rate; wanted_spec.format = AUDIO_S16SYS; wanted_spec.channels = enc->channels; wanted_spec.silence = 0; wanted_spec.samples = SDL_AUDIO_BUFFER_SIZE; wanted_spec.callback = sdl_audio_callback; wanted_spec.userdata = is; if (SDL_OpenAudio(&wanted_spec, &spec) < 0) { fprintf(stderr, "SDL_OpenAudio: %s\n", SDL_GetError()); return -1; } is->audio_hw_buf_size = spec.size; is->audio_src_fmt= SAMPLE_FMT_S16; } ic->streams[stream_index]->discard = AVDISCARD_DEFAULT; switch(enc->codec_type) { case CODEC_TYPE_AUDIO: is->audio_stream = stream_index; is->audio_st = ic->streams[stream_index]; 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 = 2.0 * SDL_AUDIO_BUFFER_SIZE / enc->sample_rate; memset(&is->audio_pkt, 0, sizeof(is->audio_pkt)); packet_queue_init(&is->audioq); SDL_PauseAudio(0); break; case CODEC_TYPE_VIDEO: is->video_stream = stream_index; is->video_st = ic->streams[stream_index]; is->frame_last_delay = 40e-3; is->frame_timer = (double)av_gettime() / 1000000.0; is->video_current_pts_time = av_gettime(); packet_queue_init(&is->videoq); is->video_tid = SDL_CreateThread(video_thread, is); break; case CODEC_TYPE_SUBTITLE: is->subtitle_stream = stream_index; is->subtitle_st = ic->streams[stream_index]; packet_queue_init(&is->subtitleq); is->subtitle_tid = SDL_CreateThread(subtitle_thread, is); break; default: break; } return 0; }