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cmAudioPortAlsa.c : _cmApThreadFunc() now generates a cmTimeSpec_t timestamp.

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This commit is contained in:
kevin 2013-12-15 18:22:24 -05:00
parent e67d8f7ea5
commit 2080d13eb2
1 changed files with 59 additions and 2 deletions
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59
linux/cmAudioPortAlsa.c
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@ -2,6 +2,7 @@
#include "cmPrefix.h"
#include "cmGlobal.h"
#include "cmRpt.h"
#include "cmTime.h"
#include "cmAudioPort.h"
#include "cmMem.h"
#include "cmTime.h"
@ -598,7 +599,6 @@ void _cmApStateRecover( snd_pcm_t* pcmH, cmApDevRecd_t* drp, bool inputFl )
// set smpPtr to NULL to write a buffer of silence
int _cmApWriteBuf( const cmApDevRecd_t* drp, snd_pcm_t* pcmH, const cmApSample_t* sp, unsigned chCnt, unsigned frmCnt, unsigned bits, unsigned sigBits )
{
int err = 0;
unsigned bytesPerSmp = (bits==24 ? 32 : bits)/8;
unsigned smpCnt = chCnt * frmCnt;
@ -781,6 +781,7 @@ void _cmApStaticAsyncHandler( snd_async_handler_t* ahandler )
while( (avail = snd_pcm_avail_update(pcmH)) >= (snd_pcm_sframes_t)frmCnt )
{
// Handle inpuut
if( inputFl )
{
@ -853,6 +854,7 @@ bool _cmApThreadFunc(void* param)
unsigned short revents = 0;
int err;
cmApAudioPacket_t pkt;
snd_pcm_uframes_t avail_frames;
inputFl ? drp->iCbCnt++ : drp->oCbCnt++;
@ -867,6 +869,35 @@ bool _cmApThreadFunc(void* param)
inputFl ? drp->iCbCnt++ : drp->oCbCnt++;
// get the timestamp for this buffer
if((err = snd_pcm_htimestamp(pcmH,&avail_frames,&pkt.timeStamp)) != 0 )
{
_cmApDevSetupError(p, err, p->pollfdsDesc[i].inputFl, drp, "Get timestamp error.");
pkt.timeStamp.tv_sec = 0;
pkt.timeStamp.tv_nsec = 0;
}
// Note that based on experimenting with the timestamp and the current
// clock_gettime(CLOCK_MONOTONIC) time it appears that the time stamp
// marks the end of the current buffer - so in fact the time stamp should
// be backed up by the availble sample count period to get the time of the
// first sample in the buffer
/*
unsigned avail_nano_secs = (unsigned)(avail_frames * (1000000000.0/drp->srate));
if( pkt.timeStamp.tv_nsec > avail_nano_secs )
pkt.timeStamp.tv_nsec -= avail_nano_secs;
else
{
pkt.timeStamp.tv_sec -= 1;
pkt.timeStamp.tv_nsec = 1000000000 - avail_nano_secs;
}
*/
//printf("AUDI: %ld %ld\n",pkt.timeStamp.tv_sec,pkt.timeStamp.tv_nsec);
//cmTimeSpec_t t;
//clock_gettime(CLOCK_PROCESS_CPUTIME_ID,&t);
//printf("AUDI: %ld %ld\n",t.tv_sec,t.tv_nsec);
switch( snd_pcm_state(pcmH) )
{
@ -910,6 +941,22 @@ bool _cmApThreadFunc(void* param)
if( !inputFl && (revents & POLLOUT) )
{
/*
unsigned srate = 96;
cmTimeSpec_t t1;
static cmTimeSpec_t t0 = {0,0};
clock_gettime(CLOCK_MONOTONIC,&t1);
// time since the time-stamp was generated
unsigned smp = (srate * (t1.tv_nsec - pkt.timeStamp.tv_nsec)) / 1000000;
// time since the last output buffer was sent
unsigned dsmp = (srate * (t1.tv_nsec - t0.tv_nsec)) / 1000000;
printf("%i %ld %i : %ld %ld -> %ld %ld\n",smp,avail_frames,dsmp,pkt.timeStamp.tv_sec,pkt.timeStamp.tv_nsec,t1.tv_sec,t1.tv_nsec);
t0 = t1;
*/
// callback to fill the buffer
drp->cbPtr(NULL,0,&pkt,1);
@ -1062,6 +1109,9 @@ bool _cmApDevSetup( cmApDevRecd_t *drp, unsigned srate, unsigned framesPerCycle,
if((err = snd_pcm_sw_params_set_avail_min(pcmH,swParams,periodFrameCnt)) < 0 )
retFl = _cmApDevSetupError(p,err,inputFl,drp,"Error setting the avail. min. setting.");
if((err = snd_pcm_sw_params_set_tstamp_mode(pcmH,swParams,SND_PCM_TSTAMP_MMAP)) < 0 )
retFl = _cmApDevSetupError(p,err,inputFl,drp,"Error setting the time samp mode.");
if((err = snd_pcm_sw_params(pcmH,swParams)) < 0 )
retFl = _cmApDevSetupError(p,err,inputFl,drp,"Error applying sw params.");
}
@ -1589,6 +1639,13 @@ cmApRC_t cmApAlsaDeviceStop( unsigned devIdx )
if((err = snd_pcm_drop(drp->oPcmH)) < 0 )
retFl = _cmApDevSetupError(p,err,false,drp,"Output stop failed.");
if( p->asyncFl == false )
if( cmThreadPause(p->thH,kPauseThFl) != kOkThRC )
{
_cmApOsError(p,0,"Audio thread pause failed.");
retFl = false;
}
return retFl ? kOkApRC : kSysErrApRC;
}