I can't seem to make any headway with ffmpeg and sound.
I've been at it for quite some time now and I have downloaded half the
internet looking for a working example.
I am using a downloaded program falled 'fister' which is probably quite
well known.
I have put code into it so that it will read the file, then compress and
decompress the sound and play it.
I should be getting my own voice back but I get nothing.
Here is the code.
I can send the whole fister project if anyone could like to have a look
at it.
Again, thanks in advance for any help received.
Peadar
void CPipe::ReadSoundDataFromFile(CBuffer* buffer)
{
char ErrLine[501];
int j,k,ret, got_output, len2, cnt;
uint8_t * out[] = { audio_buf };
if(m_pFile)
{
if(!m_pFile->Read(buffer))
{
OnEndOfPlayingFile();
delete m_pFile;
}
}
ChineseFrameBuff = (uint8_t *)buffer->ptr.c;
av_init_packet(&ChinesePacket);
ChinesePacket.data = NULL;
ChinesePacket.size = 0;
ret = avcodec_encode_audio2(ChineseCodecCtx, &ChinesePacket,
ChineseFrame, &got_output);
if (ret < 0)
{
sprintf(ErrLine, "Error encoding audio frame");
AfxMessageBox(ErrLine);
exit(1);
}
if (got_output)
{
int got_frame=0;
// avcodec_get_frame_defaults(Mp3Frame); // doesn't seem to
do aything
int len = avcodec_decode_audio4(Mp3CodecContext, Mp3Frame,
&got_frame, &ChinesePacket);
if (len < 0 || got_frame == 0)
{
sprintf(ErrLine, "Error while decoding");
AfxMessageBox(ErrLine);
exit(1);
}
if(m_pSwrCtx == NULL)
{
m_pSwrCtx = swr_alloc_set_opts(NULL
, AV_CH_LAYOUT_STEREO
, AV_SAMPLE_FMT_S16
, Mp3CodecContext->sample_rate
,
av_get_default_channel_layout(Mp3Frame->channels)
, (AVSampleFormat)Mp3Frame->format
, Mp3Frame->sample_rate
, 0
, NULL
);
swr_init(m_pSwrCtx);
}
len2 = swr_convert(m_pSwrCtx
, out
, AVCODEC_MAX_AUDIO_FRAME_SIZE * 4
, (const uint8_t **)Mp3Frame->extended_data
, Mp3Frame->nb_samples
);
// make sure the buffer is cleared out.
for(int count=0; count<2000; count++)
{
buffer->ptr.c[count] = '*';
}
strcpy(buffer->ptr.c, (char *)audio_buf);
}
}
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