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Fri Jan 12 12:00:28 CET 2007 · https://ffmpeg.org/pipermail/ffmpeg-devel/2007-January/027301.html

Hi

On Fri, Jan 12, 2007 at 01:58:13PM +0700, Paul wrote:
> I capture (using directsound) my voice to a buffer, and i would like to encode every buffer (captured) into MPEG frame(s) and then write to output file.
> Here are my code to encode a buffer (audio date with PCM format) to MPEG frame(s)
> But it is not success, i donot know where/what i missing. So, can you help?
> 
> {
>    //packet.data is a buffer that stored audio data (PCM format)
>    //AVCODEC_MAX_AUDIO_FRAME_SIZE = 192000    
>    samples = (short *) av_fast_realloc(samples, &samples_size, FFMAX(4096, AVCODEC_MAX_AUDIO_FRAME_SIZE));
>    samples = (short *)packet.data;
> 
>    avcodec_decode_audio(pCodecCtx, samples, &frameFinished, packet.data, 4096);

no you cannot decode a packet into itself

>    fifo_write(&fifo, (uint8_t *)samples, 4096, &fifo.wptr);

you also must use the returned number of samples instead of a random 4096

> 
>   if(frameFinished)
>   {         
>      int frame_bytes = c->frame_size * 2 * c->channels;
>      fifo_read(&fifo, data_buf, frame_bytes, &fifo.rptr); 
>      {
>        // encode the samples   
>        pkt.size= avcodec_encode_audio(c, audio_out, 4096,(short *)data_buf);
>        pkt.stream_index= audio_st->index;
>        pkt.data= audio_out;
>        pkt.flags |= PKT_FLAG_KEY;
>      
>        fwrite(pkt.data,sizeof(int8_t),pkt.size,file);
>        // write the compressed frame in the media file 
>        if (av_interleaved_write_frame(oc, &pkt) != 0)
>        {
>           fprintf(stderr, "Error while writing audio frame\n");
>           return false;
>        }
>     }
>  }

this must be a loop of course how could it work otherwise?!

[...]

-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

No snowflake in an avalanche ever feels responsible. -- Voltaire
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[Ffmpeg-devel] Captured buffer (PCM) to MPEG frame(s).. How to do this???