int ffaml_queue_packet(AVCodecContext *avctx, PacketQueue *queue, AVPacket *avpkt)
{
int ret = 0;
// create our packet entry for the queue
PacketEntry *packetentry = malloc(sizeof(*packetentry));
if (!packetentry) {
ret = AVERROR(ENOMEM);
goto done;
}
packetentry->pkt = av_packet_clone(avpkt);
packetentry->next = NULL;
packetentry->prev = NULL;
if (!packetentry->pkt)
av_log(avctx, AV_LOG_ERROR, "queuing null packet !!\n");
// add the packet to start of the queue
if (queue->head)
{
packetentry->next = queue->head;
queue->head->prev = packetentry;
}
if (!queue->tail)
queue->tail = packetentry;
queue->head = packetentry;
queue->size++;
#if DEBUG
av_log(avctx, AV_LOG_DEBUG, "queued packet in %x, entry=%x, pkt=%x size= %d\n", queue, packetentry,packetentry->pkt, queue->size);
#endif
return 0;
done:
return ret;
}
bool FFmpegAudioReader::readFrame(AVFrame* decode_frame) {
// FFmpeg 3.1 and onwards has a new, better packet handling API but that version is relatively new so we still need
// to support the earlier API. The compatibility code can be removed once the new version is supported by most platforms
#if LIBAVCODEC_VERSION_INT > AV_VERSION_INT(57, 24, 255)
// Process pending frames
auto pending_res = avcodec_receive_frame(_codec_ctx, decode_frame);
if (pending_res == 0) {
// Got a frame
return true;
}
if (pending_res == AVERROR_EOF) {
// No more frames available
return false;
}
if (pending_res != AVERROR(EAGAIN)) {
// Unknown error.
return false;
}
#else
if (_currentPacket != nullptr) {
// Got some data left
int finishedFrame = 0;
auto bytes_read = avcodec_decode_audio4(_codec_ctx, decode_frame, &finishedFrame, _currentPacket);
if (bytes_read < 0) {
// Error!
return false;
}
_currentPacket->data += bytes_read;
_currentPacket->size -= bytes_read;
if (_currentPacket->size <= 0) {
// Done with this packet
av_packet_free(&_currentPacket);
}
if (finishedFrame) {
return true;
}
}
#endif
AVPacket packet;
while (av_read_frame(_format_ctx, &packet) >= 0) {
AVPacketScope packet_scope(&packet);
if (packet.stream_index == _stream_idx) {
#if LIBAVCODEC_VERSION_INT > AV_VERSION_INT(57, 24, 255)
auto res = avcodec_send_packet(_codec_ctx, &packet);
if (res != 0) {
// Error or EOF
return false;
}
res = avcodec_receive_frame(_codec_ctx, decode_frame);
if (res == 0) {
// Got a frame
return true;
}
if (res == AVERROR_EOF) {
// No more frames available
return false;
}
if (res != AVERROR(EAGAIN)) {
// Unknown error.
return false;
}
// EGAIN was returned, send new input
#else
int finishedFrame = 0;
auto bytes_read = avcodec_decode_audio4(_codec_ctx, decode_frame, &finishedFrame, &packet);
if (bytes_read < packet.size) {
// Not all data was read
packet.data += bytes_read;
packet.size -= bytes_read;
_currentPacket = av_packet_clone(&packet);
}
if (finishedFrame) {
return true;
}
if (bytes_read < 0) {
// Error
return false;
}
#endif
}
}
#if LIBAVCODEC_VERSION_INT > AV_VERSION_INT(57, 24, 255)
// Flush decoder
if (avcodec_send_packet(_codec_ctx, nullptr) != 0) {
return false;
}
auto flush_res = avcodec_receive_frame(_codec_ctx, decode_frame);
if (flush_res == 0) {
// Got a frame
return true;
}
#else
AVPacket nullPacket;
memset(&nullPacket, 0, sizeof(nullPacket));
nullPacket.data = nullptr;
nullPacket.size = 0;
int finishedFrame = 1;
auto err = avcodec_decode_audio4(_codec_ctx, decode_frame, &finishedFrame, &nullPacket);
if (finishedFrame && err >= 0) {
return true;
}
#endif
// If we are here then read_frame reached the end or returned an error
return false;
}
