[Libav-user] How to read in planar data?

[Mark McKay]

I should have mentioned that the crash was happening at the line

     _audioBytes.append((const char *)aFrame->data[ch] + i * 
sizeof(float), sizeof(float));

This happens after 590 packets have been read.




On 2019-12-06 17:05, Mark McKay wrote:
> Just reposting with properly formatted code:
> 
> void AudioReader::loadAudioFrame(AVPacket& packet)
> {
>     int err = avcodec_send_packet(aCodecCtx, &packet);
>     if (err < 0)
>     {
>         qDebug("Error sending packet to decoder");
>         return;
>     }
> 
>     int numChannels = aCodecCtx->channels;
>     while (err >= 0)
>     {
>         err = avcodec_receive_frame(aCodecCtx, aFrame);
>         if (err == AVERROR(EAGAIN) || err == AVERROR_EOF)
>         return;
> 
>         if (err < 0)
>         {
>             qDebug() << "Error decoding packet: " << err;
>             return;
>         }
> 
>         int bytesPerSample = 
> av_get_bytes_per_sample(aCodecCtx->sample_fmt);
>         if (bytesPerSample < 0) {
>         /* This should not occur, checking just for paranoia */
>         fprintf(stderr, "Failed to calculate data size\n");
>         exit(1);
>         }
> 
> 
>         int bufferSize = av_samples_get_buffer_size(NULL,
>         aCodecCtx->channels,
>         aFrame->nb_samples,
>         aCodecCtx->sample_fmt,
>         1);
> 
>         switch(aCodecCtx->sample_fmt)
>         {
>         ...
>         case AV_SAMPLE_FMT_FLTP:
>         {
>             //Serial format - change to interleaved order
>             for (int i = 0; i < aFrame->nb_samples; i++)
>             {
>                 for (int ch = 0; ch < numChannels; ch++)
>                 {
>                     _audioBytes.append((const char *)aFrame->data[ch] + 
> i * sizeof(float), sizeof(float));
>                 }
>             }
>             break;
>         }
>         }
> }
> 
> 
> 
> On 2019-12-06 15:55, Mark McKay wrote:
> 
>> I'm having trouble trying to figure out how to read in planar data.  I 
>> have a file that has data in the AV_SAMPLE_FMT_FLTP format with two 
>> channels.  Below is my attempt to read in the data.  This will crash 
>> with a memory problem if I try to read in the second channel (but it 
>> will complete if I bypass the second and just read from channel 0).  
>> Am I doing this right?
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