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/**
* @file winwave/src.c Windows sound driver -- source
*
* Copyright (C) 2010 Creytiv.com
*/
#include <re.h>
#include <rem.h>
#include <windows.h>
#include <mmsystem.h>
#include <baresip.h>
#include "winwave.h"
#define READ_BUFFERS 4
#define INC_RPOS(a) ((a) = (((a) + 1) % READ_BUFFERS))
struct ausrc_st {
const struct ausrc *as; /* inheritance */
struct dspbuf bufs[READ_BUFFERS];
int pos;
HWAVEIN wavein;
volatile bool rdy;
size_t inuse;
ausrc_read_h *rh;
void *arg;
};
static void ausrc_destructor(void *arg)
{
struct ausrc_st *st = arg;
int i;
st->rh = NULL;
waveInStop(st->wavein);
waveInReset(st->wavein);
for (i = 0; i < READ_BUFFERS; i++) {
waveInUnprepareHeader(st->wavein, &st->bufs[i].wh,
sizeof(WAVEHDR));
mem_deref(st->bufs[i].mb);
}
waveInClose(st->wavein);
}
static int add_wave_in(struct ausrc_st *st)
{
struct dspbuf *db = &st->bufs[st->pos];
WAVEHDR *wh = &db->wh;
MMRESULT res;
wh->lpData = (LPSTR)db->mb->buf;
wh->dwBufferLength = db->mb->size;
wh->dwBytesRecorded = 0;
wh->dwFlags = 0;
wh->dwUser = (DWORD_PTR)db->mb;
waveInPrepareHeader(st->wavein, wh, sizeof(*wh));
res = waveInAddBuffer(st->wavein, wh, sizeof(*wh));
if (res != MMSYSERR_NOERROR) {
warning("winwave: add_wave_in: waveInAddBuffer fail: %08x\n",
res);
return ENOMEM;
}
INC_RPOS(st->pos);
st->inuse++;
return 0;
}
static void CALLBACK waveInCallback(HWAVEOUT hwo,
UINT uMsg,
DWORD_PTR dwInstance,
DWORD_PTR dwParam1,
DWORD_PTR dwParam2)
{
struct ausrc_st *st = (struct ausrc_st *)dwInstance;
WAVEHDR *wh = (WAVEHDR *)dwParam1;
(void)hwo;
(void)dwParam2;
if (!st->rh)
return;
switch (uMsg) {
case WIM_CLOSE:
st->rdy = false;
break;
case WIM_OPEN:
st->rdy = true;
break;
case WIM_DATA:
if (st->inuse < (READ_BUFFERS-1))
add_wave_in(st);
st->rh((void *)wh->lpData, wh->dwBytesRecorded/2, st->arg);
waveInUnprepareHeader(st->wavein, wh, sizeof(*wh));
st->inuse--;
break;
default:
break;
}
}
static unsigned int find_dev(const char *name)
{
WAVEINCAPS wic;
unsigned int i, nInDevices = waveInGetNumDevs();
if (!str_isset(name))
return WAVE_MAPPER;
for (i=0; i<nInDevices; i++) {
if (waveInGetDevCaps(i, &wic,
sizeof(WAVEINCAPS))==MMSYSERR_NOERROR) {
if (0 == str_casecmp(name, wic.szPname)) {
return i;
}
}
}
return WAVE_MAPPER;
}
static int read_stream_open(struct ausrc_st *st, const struct ausrc_prm *prm,
unsigned int dev)
{
WAVEFORMATEX wfmt;
MMRESULT res;
uint32_t sampc;
int i, err = 0;
/* Open an audio INPUT stream. */
st->wavein = NULL;
st->pos = 0;
st->rdy = false;
sampc = prm->srate * prm->ch * prm->ptime / 1000;
for (i = 0; i < READ_BUFFERS; i++) {
memset(&st->bufs[i].wh, 0, sizeof(WAVEHDR));
st->bufs[i].mb = mbuf_alloc(2 * sampc);
if (!st->bufs[i].mb)
return ENOMEM;
}
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 = waveInOpen(&st->wavein, dev, &wfmt,
(DWORD_PTR) waveInCallback,
(DWORD_PTR) st,
CALLBACK_FUNCTION | WAVE_FORMAT_DIRECT);
if (res != MMSYSERR_NOERROR) {
warning("winwave: waveInOpen: failed %d\n", err);
return EINVAL;
}
/* Prepare enough IN buffers to suite at least 50ms of data */
for (i = 0; i < READ_BUFFERS; i++)
err |= add_wave_in(st);
waveInStart(st->wavein);
return err;
}
int winwave_src_alloc(struct ausrc_st **stp, const struct ausrc *as,
struct media_ctx **ctx,
struct ausrc_prm *prm, const char *device,
ausrc_read_h *rh, ausrc_error_h *errh, void *arg)
{
struct ausrc_st *st;
int err;
(void)ctx;
(void)errh;
if (!stp || !as || !prm)
return EINVAL;
if (prm->fmt != AUFMT_S16LE) {
warning("winwave: source: unsupported sample format (%s)\n",
aufmt_name(prm->fmt));
return ENOTSUP;
}
st = mem_zalloc(sizeof(*st), ausrc_destructor);
if (!st)
return ENOMEM;
st->as = as;
st->rh = rh;
st->arg = arg;
err = read_stream_open(st, prm, find_dev(device));
if (err)
mem_deref(st);
else
*stp = st;
return err;
}
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