I'm trying to encode an audio frame using ffmpeg library and Opus codec but i faced with this error :
Resource temporarily unavailable
My source code :
void encode_audio(uint8_t *frame , int frame_size , void (*onPacket)(uint8_t *packet , int packet_size)){
if(audio_encoder_codec_context != NULL){
memset(audio_encoder_frame_buffer , 0 , (size_t) audio_encoder_frame_size);
swr_convert(
s16_to_flt_resampler,
&audio_encoder_frame_buffer,
audio_encoder_frame_size,
(const uint8_t **) &frame,
frame_size
);
int result = avcodec_send_frame(audio_encoder_codec_context , audio_encoder_frame);
while(result >= 0){
result = avcodec_receive_packet(audio_encoder_codec_context , audio_encoder_packet);
char *a = malloc(1024);
av_strerror(result , a , 1024);
printf("%s\n",a);
if (result == AVERROR(EAGAIN) || result == AVERROR_EOF || result < 0){
break;
}
onPacket(audio_encoder_packet->data , audio_encoder_packet->size);
av_packet_unref(audio_encoder_packet);
}
}
}
This is coming from AVERROR(EAGAIN)
.
You should send more frames when AVERROR(EAGAIN)
is returned.
Docs state this for avcodec_receive_packet
avcodec.h:
/**
* Read encoded data from the encoder.
*
* @param avctx codec context
* @param avpkt This will be set to a reference-counted packet allocated by the
* encoder. Note that the function will always call
* av_packet_unref(avpkt) before doing anything else.
* @return 0 on success, otherwise negative error code:
* AVERROR(EAGAIN): output is not available in the current state - user
* must try to send input
* AVERROR_EOF: the encoder has been fully flushed, and there will be
* no more output packets
* AVERROR(EINVAL): codec not opened, or it is a decoder
* other errors: legitimate encoding errors
*/
int avcodec_receive_packet(AVCodecContext *avctx, AVPacket *avpkt);
Depending on the data, FFmpeg can require additional input/data before output can be produced.
More from the docs:
AVERROR(EAGAIN): output is not available in the current state - user must try to send input.
Keep giving it data until you get a return code of 0 (success).
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