static int process_input_packet(InputStream *ist, const AVPacket *pkt) { int i; int got_output; AVPacket avpkt; if (ist->next_dts == AV_NOPTS_VALUE) ist->next_dts = ist->last_dts; if (pkt == NULL) { /* EOF handling */ av_init_packet(&avpkt); avpkt.data = NULL; avpkt.size = 0; goto handle_eof; } else { avpkt = *pkt; } if (pkt->dts != AV_NOPTS_VALUE) ist->next_dts = ist->last_dts = av_rescale_q(pkt->dts, ist->st->time_base, AV_TIME_BASE_Q); // while we have more to decode or while the decoder did output something on EOF while (ist->decoding_needed && (avpkt.size > 0 || (!pkt && got_output))) { int ret = 0; handle_eof: ist->last_dts = ist->next_dts; if (avpkt.size && avpkt.size != pkt->size && !(ist->dec->capabilities & CODEC_CAP_SUBFRAMES)) { av_log(NULL, ist->showed_multi_packet_warning ? AV_LOG_VERBOSE : AV_LOG_WARNING, "Multiple frames in a packet from stream %d\n", pkt->stream_index); ist->showed_multi_packet_warning = 1; } switch (ist->dec_ctx->codec_type) { case AVMEDIA_TYPE_AUDIO: ret = decode_audio (ist, &avpkt, &got_output); break; case AVMEDIA_TYPE_VIDEO: ret = decode_video (ist, &avpkt, &got_output); if (avpkt.duration) ist->next_dts += av_rescale_q(avpkt.duration, ist->st->time_base, AV_TIME_BASE_Q); else if (ist->st->avg_frame_rate.num) ist->next_dts += av_rescale_q(1, av_inv_q(ist->st->avg_frame_rate), AV_TIME_BASE_Q); else if (ist->dec_ctx->time_base.num != 0) { int ticks = ist->st->parser ? ist->st->parser->repeat_pict + 1 : ist->dec_ctx->ticks_per_frame; ist->next_dts += av_rescale_q(ticks, ist->dec_ctx->time_base, AV_TIME_BASE_Q); } break; case AVMEDIA_TYPE_SUBTITLE: ret = transcode_subtitles(ist, &avpkt, &got_output); break; default: return -1; } if (ret < 0) return ret; // touch data and size only if not EOF if (pkt) { avpkt.data += ret; avpkt.size -= ret; } if (!got_output) { continue; } } /* handle stream copy */ if (!ist->decoding_needed) { ist->last_dts = ist->next_dts; switch (ist->dec_ctx->codec_type) { case AVMEDIA_TYPE_AUDIO: ist->next_dts += ((int64_t)AV_TIME_BASE * ist->dec_ctx->frame_size) / ist->dec_ctx->sample_rate; break; case AVMEDIA_TYPE_VIDEO: if (ist->dec_ctx->time_base.num != 0) { int ticks = ist->st->parser ? ist->st->parser->repeat_pict + 1 : ist->dec_ctx->ticks_per_frame; ist->next_dts += ((int64_t)AV_TIME_BASE * ist->dec_ctx->time_base.num * ticks) / ist->dec_ctx->time_base.den; } break; } } for (i = 0; pkt && i < nb_output_streams; i++) { OutputStream *ost = output_streams[i]; if (!check_output_constraints(ist, ost) || ost->encoding_needed) continue; do_streamcopy(ist, ost, pkt); } return 0; }