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/**
* @file winwave/play.c Windows sound driver -- playback
*
* Copyright (C) 2010 Creytiv.com
*/
#include <re.h>
#include <rem.h>
#include <windows.h>
#include <mmsystem.h>
#include <baresip.h>
#include "winwave.h"
#define DEBUG_MODULE "winwave"
#define DEBUG_LEVEL 5
#include <re_dbg.h>
#define WRITE_BUFFERS 4
#define INC_WPOS(a) ((a) = (((a) + 1) % WRITE_BUFFERS))
struct auplay_st {
struct auplay *ap; /* inheritance */
struct dspbuf bufs[WRITE_BUFFERS];
int pos;
HWAVEOUT waveout;
bool rdy;
size_t inuse;
auplay_write_h *wh;
void *arg;
};
static void auplay_destructor(void *arg)
{
struct auplay_st *st = arg;
int i;
st->wh = NULL;
/* Mark the device for closing, and wait for all the
* buffers to be returned by the driver
*/
st->rdy = false;
while (st->inuse > 0)
Sleep(50);
waveOutClose(st->waveout);
for (i = 0; i < WRITE_BUFFERS; i++) {
waveOutUnprepareHeader(st->waveout, &st->bufs[i].wh,
sizeof(WAVEHDR));
mem_deref(st->bufs[i].mb);
}
mem_deref(st->ap);
}
static int dsp_write(struct auplay_st *st)
{
MMRESULT res;
WAVEHDR *wh;
struct mbuf *mb;
if (!st->rdy)
return EINVAL;
wh = &st->bufs[st->pos].wh;
if (wh->dwFlags & WHDR_PREPARED) {
return EINVAL;
}
mb = st->bufs[st->pos].mb;
wh->lpData = (LPSTR)mb->buf;
if (st->wh) {
st->wh(mb->buf, mb->size, st->arg);
}
wh->dwBufferLength = mb->size;
wh->dwFlags = 0;
wh->dwUser = (DWORD_PTR) mb;
waveOutPrepareHeader(st->waveout, wh, sizeof(*wh));
INC_WPOS(st->pos);
res = waveOutWrite(st->waveout, wh, sizeof(*wh));
if (res != MMSYSERR_NOERROR)
DEBUG_WARNING("dsp_write: waveOutWrite: failed: %08x\n", res);
else
st->inuse++;
return 0;
}
static void CALLBACK waveOutCallback(HWAVEOUT hwo,
UINT uMsg,
DWORD_PTR dwInstance,
DWORD_PTR dwParam1,
DWORD_PTR dwParam2)
{
struct auplay_st *st = (struct auplay_st *)dwInstance;
WAVEHDR *wh = (WAVEHDR *)dwParam1;
(void)hwo;
(void)dwParam2;
switch (uMsg) {
case WOM_OPEN:
st->rdy = true;
break;
case WOM_DONE:
/*LOCK();*/
waveOutUnprepareHeader(st->waveout, wh, sizeof(*wh));
/*UNLOCK();*/
st->inuse--;
dsp_write(st);
break;
case WOM_CLOSE:
st->rdy = false;
break;
default:
break;
}
}
static int write_stream_open(struct auplay_st *st,
const struct auplay_prm *prm)
{
WAVEFORMATEX wfmt;
MMRESULT res;
uint32_t sampc;
int i;
/* Open an audio I/O stream. */
st->waveout = NULL;
st->pos = 0;
st->rdy = false;
sampc = prm->srate * prm->ch * prm->ptime / 1000;
for (i = 0; i < WRITE_BUFFERS; i++) {
memset(&st->bufs[i].wh, 0, sizeof(WAVEHDR));
st->bufs[i].mb = mbuf_alloc(2 * sampc);
}
wfmt.wFormatTag = WAVE_FORMAT_PCM;
wfmt.nChannels = prm->ch;
wfmt.nSamplesPerSec = prm->srate;
wfmt.wBitsPerSample = 16;
wfmt.nBlockAlign = (prm->ch * wfmt.wBitsPerSample) / 8;
wfmt.nAvgBytesPerSec = wfmt.nSamplesPerSec * wfmt.nBlockAlign;
wfmt.cbSize = 0;
res = waveOutOpen(&st->waveout, WAVE_MAPPER, &wfmt,
(DWORD_PTR) waveOutCallback,
(DWORD_PTR) st,
CALLBACK_FUNCTION | WAVE_FORMAT_DIRECT);
if (res != MMSYSERR_NOERROR) {
DEBUG_WARNING("waveOutOpen: failed %d\n", res);
return EINVAL;
}
waveOutClose(st->waveout);
res = waveOutOpen(&st->waveout, WAVE_MAPPER, &wfmt,
(DWORD_PTR) waveOutCallback,
(DWORD_PTR) st,
CALLBACK_FUNCTION | WAVE_FORMAT_DIRECT);
if (res != MMSYSERR_NOERROR) {
DEBUG_WARNING("waveOutOpen: failed %d\n", res);
return EINVAL;
}
return 0;
}
int winwave_play_alloc(struct auplay_st **stp, struct auplay *ap,
struct auplay_prm *prm, const char *device,
auplay_write_h *wh, void *arg)
{
struct auplay_st *st;
int i, err;
(void)device;
if (!stp || !ap || !prm)
return EINVAL;
st = mem_zalloc(sizeof(*st), auplay_destructor);
if (!st)
return ENOMEM;
st->ap = mem_ref(ap);
st->wh = wh;
st->arg = arg;
err = write_stream_open(st, prm);
if (err)
goto out;
/* The write runs at 100ms intervals
* prepare enough buffers to suite its needs
*/
for (i = 0; i < 5; i++)
dsp_write(st);
out:
if (err)
mem_deref(st);
else
*stp = st;
return err;
}
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