static int queue_picture(VideoState *is, AVFrame *src_frame, double pts) { VideoPicture *vp; int dst_pix_fmt; AVPicture pict; static struct SwsContext *img_convert_ctx; /* wait until we have space to put a new picture */ SDL_LockMutex(is->pictq_mutex); while (is->pictq_size >= VIDEO_PICTURE_QUEUE_SIZE && !is->videoq.abort_request) { SDL_CondWait(is->pictq_cond, is->pictq_mutex); } SDL_UnlockMutex(is->pictq_mutex); if (is->videoq.abort_request) return -1; vp = &is->pictq[is->pictq_windex]; /* alloc or resize hardware picture buffer */ if (!vp->bmp || vp->width != is->video_st->codec->width || vp->height != is->video_st->codec->height) { SDL_Event event; vp->allocated = 0; /* the allocation must be done in the main thread to avoid locking problems */ event.type = FF_ALLOC_EVENT; event.user.data1 = is; SDL_PushEvent(&event); /* wait until the picture is allocated */ SDL_LockMutex(is->pictq_mutex); while (!vp->allocated && !is->videoq.abort_request) { SDL_CondWait(is->pictq_cond, is->pictq_mutex); } SDL_UnlockMutex(is->pictq_mutex); if (is->videoq.abort_request) return -1; } /* if the frame is not skipped, then display it */ if (vp->bmp) { /* get a pointer on the bitmap */ 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_flags = av_get_int(sws_opts, "sws_flags", NULL); img_convert_ctx = sws_getCachedContext(img_convert_ctx, is->video_st->codec->width, is->video_st->codec->height, is->video_st->codec->pix_fmt, is->video_st->codec->width, is->video_st->codec->height, dst_pix_fmt, sws_flags, NULL, NULL, NULL); if (img_convert_ctx == NULL) { fprintf(stderr, "Cannot initialize the conversion context\n"); exit(1); } sws_scale(img_convert_ctx, src_frame->data, src_frame->linesize, 0, is->video_st->codec->height, pict.data, pict.linesize); /* update the bitmap content */ SDL_UnlockYUVOverlay(vp->bmp); vp->pts = pts; /* now we can update the picture count */ 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; }