Method GetAVFrame

src/FFmpegReader.cpp:1500–1732

Get an AVFrame (if any)

// Get an AVFrame (if any)
bool FFmpegReader::GetAVFrame() {
	int frameFinished = 0;
	auto note_hw_decode_failure = [&](int err, const char* stage) {
#if USE_HW_ACCEL
		if (!hw_de_on || !hw_de_supported || force_sw_decode) {
			return;
		}
		if (err == AVERROR_INVALIDDATA && packet_status.video_decoded == 0) {
			hw_decode_error_count++;
			ZmqLogger::Instance()->AppendDebugMethod(
				std::string("FFmpegReader::GetAVFrame (hardware decode failure candidate during ") + stage + ")",
				"error_count", hw_decode_error_count,
				"error", err);
			if (hw_decode_error_count >= 3) {
				hw_decode_failed = true;
			}
		}
#else
		(void) err;
		(void) stage;
#endif
	};

	// Decode video frame
	AVFrame *next_frame = AV_ALLOCATE_FRAME();

#if IS_FFMPEG_3_2
	int send_packet_err = 0;
	int64_t send_packet_pts = 0;
	if ((packet && packet->stream_index == videoStream) || !packet) {
		send_packet_err = avcodec_send_packet(pCodecCtx, packet);

		if (packet && send_packet_err >= 0) {
			send_packet_pts = GetPacketPTS();
			hold_packet = false;
			ZmqLogger::Instance()->AppendDebugMethod("FFmpegReader::GetAVFrame (send packet succeeded)", "send_packet_err", send_packet_err, "send_packet_pts", send_packet_pts);
		}
	}

	#if USE_HW_ACCEL
		// Get the format from the variables set in get_hw_dec_format
		hw_de_av_pix_fmt = hw_de_av_pix_fmt_global;
		hw_de_av_device_type = hw_de_av_device_type_global;
	#endif // USE_HW_ACCEL
		if (send_packet_err < 0 && send_packet_err != AVERROR_EOF) {
			ZmqLogger::Instance()->AppendDebugMethod("FFmpegReader::GetAVFrame (send packet: Not sent [" + av_err2string(send_packet_err) + "])", "send_packet_err", send_packet_err, "send_packet_pts", send_packet_pts);
			note_hw_decode_failure(send_packet_err, "send_packet");
			if (send_packet_err == AVERROR(EAGAIN)) {
				hold_packet = true;
				ZmqLogger::Instance()->AppendDebugMethod("FFmpegReader::GetAVFrame (send packet: AVERROR(EAGAIN): user must read output with avcodec_receive_frame()", "send_packet_pts", send_packet_pts);
			}
			if (send_packet_err == AVERROR(EINVAL)) {
				ZmqLogger::Instance()->AppendDebugMethod("FFmpegReader::GetAVFrame (send packet: AVERROR(EINVAL): codec not opened, it is an encoder, or requires flush", "send_packet_pts", send_packet_pts);
			}
			if (send_packet_err == AVERROR(ENOMEM)) {
				ZmqLogger::Instance()->AppendDebugMethod("FFmpegReader::GetAVFrame (send packet: AVERROR(ENOMEM): failed to add packet to internal queue, or legitimate decoding errors", "send_packet_pts", send_packet_pts);
			}
		}