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v4l2: ALSA error handling.

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This commit is contained in:
Richard Hosking 2007-12-13 15:14:10 +00:00
parent 191479d73b
commit e43b973a16
1 changed files with 28 additions and 7 deletions
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35
modules/access/v4l2.c
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@ -35,7 +35,6 @@
/*
* TODO: Tuner partial implementation.
* TODO: Alsa input support - experimental
*/
/*****************************************************************************
@ -1129,10 +1128,32 @@ static block_t* GrabAudio( demux_t *p_demux )
{
/* ALSA */
i_read = snd_pcm_readi( p_sys->p_alsa_pcm, p_block->p_buffer, p_sys->i_alsa_chunk_size );
/* TODO: ALSA ERROR HANDLING?? xrun?? */
/* convert from frames to bytes */
if( i_read > 0 ) i_read *= p_sys->i_alsa_frame_size;
if( i_read <= 0 )
{
int i_resume;
switch( i_read )
{
case -EAGAIN:
break;
case -EPIPE:
/* xrun */
snd_pcm_prepare( p_sys->p_alsa_pcm );
break;
case -ESTRPIPE:
/* suspend */
i_resume = snd_pcm_resume( p_sys->p_alsa_pcm );
if( i_resume < 0 && i_resume != -EAGAIN ) snd_pcm_prepare( p_sys->p_alsa_pcm );
break;
default:
msg_Err( p_demux, "Failed to read alsa frame (%s)", snd_strerror( i_read ) );
return 0;
}
}
else
{
/* convert from frames to bytes */
i_read *= p_sys->i_alsa_frame_size;
}
}
else
#endif
@ -1153,6 +1174,7 @@ static block_t* GrabAudio( demux_t *p_demux )
if( !p_sys->b_use_alsa )
#endif
{
/* OSS */
if( ioctl( p_sys->i_fd_audio, SNDCTL_DSP_GETISPACE, &buf_info ) == 0 )
{
i_correct += buf_info.bytes;
@ -1161,8 +1183,7 @@ static block_t* GrabAudio( demux_t *p_demux )
#ifdef HAVE_ALSA
else
{
/* TODO: ALSA timing */
/* Very experimental code... */
/* ALSA */
int i_err;
snd_pcm_sframes_t delay = 0;
if( ( i_err = snd_pcm_delay( p_sys->p_alsa_pcm, &delay ) ) >= 0 )