ref: 4ee6e3c11553c2883eba0da18cb1608ca9880d96
dir: /src/waveaudio.c/
/* libSoX device driver: MS-Windows audio (c) 2009 SoX contributors
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at
* your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
* General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "sox_i.h"
#include <windows.h>
#include <mmsystem.h>
/* Larger means more latency (difference between the status line and the audio you hear),
* but it means lower chance of stuttering/glitching. 2 buffers is usually enough. Use
* 4 if you want to be extra-safe.
*/
#define num_buffers 4
typedef struct waveaudio_priv_t
{
/* Handle to the input device (microphone, line in, etc.). NULL if playing. */
HWAVEIN hin;
/* Handle to the output device (speakers, line out, etc.). NULL if recording. */
HWAVEOUT hout;
/* Event that becomes signaled when a the system has finished processing a buffer. */
HANDLE block_finished_event;
/* Data transfer buffers. The lpData member of the first buffer points at
* data[buf_len*sample_size*0], the second buffer's lpData points
* data[buf_len*sample_size*1], etc. The dwUser field contains the number
* of samples of this buffer that have already been processed.
*/
WAVEHDR headers[num_buffers];
/* The combined data area shared by all transfer buffers. */
char * data;
/* The number of samples that can fit into one transfer buffer. */
size_t buf_len;
/* Index of the buffer that we're currently processing. For playback, this is the buffer
* that will receive the next samples. For recording, this is the buffer from which we'll
* be getting the next samples. If no buffers are ready for processing, this is the buffer
* that will be the next to become ready.
*/
unsigned current;
/* If there has been an error, this has the Win32 error code. Otherwise, this is 0. */
DWORD error;
} priv_t;
static void fail(sox_format_t* ft, DWORD code, const char* context)
{
char message[256];
DWORD formatMessageOk = FormatMessageA(
FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
code,
0,
message,
sizeof(message) / sizeof(message[0]),
NULL);
if (formatMessageOk)
lsx_fail_errno(ft, SOX_EOF, "WaveAudio %s failed with code %d: %s", context, (int)code, message);
else
lsx_fail_errno(ft, SOX_EOF, "WaveAudio %s failed with unrecognized MMSYSERR code %d.", context, (int)code);
}
static int stop(sox_format_t* ft)
{
priv_t *priv = (priv_t*)ft->priv;
if (priv == NULL) return SOX_EOF;
if (priv->hin)
{
priv->error = waveInReset(priv->hin);
priv->error = waveInClose(priv->hin);
}
if (priv->hout && !priv->error)
{
while ((priv->error = waveOutClose(priv->hout)) == WAVERR_STILLPLAYING)
{
WaitForSingleObject(priv->block_finished_event, INFINITE);
}
}
else if (priv->hout)
{
priv->error = waveOutReset(priv->hout);
priv->error = waveOutClose(priv->hout);
}
if (priv->block_finished_event)
CloseHandle(priv->block_finished_event);
if (priv->data)
free(priv->data);
return SOX_SUCCESS;
}
static int start(sox_format_t* ft)
{
size_t i;
UINT dev;
WAVEFORMATEX fmt;
int recording = ft->mode == 'r';
priv_t *priv = (priv_t*)ft->priv;
if (priv == NULL) return SOX_EOF;
/* Handle AUDIODEV device selection:
* NULL, blank, or "default" gets you the default device (WAVE_MAPPER = -1).
* An integer value gets you the device with that device number, if it exists (counting starts at 0).
* A string gets you the device with that name, if it exists.
*/
if (ft->filename == 0 || ft->filename == 0 || !strcasecmp("default", ft->filename))
{
dev = WAVE_MAPPER;
}
else
{
WAVEINCAPSA incaps;
WAVEOUTCAPSA outcaps;
const char *dev_name;
char* dev_num_end;
dev = strtoul(ft->filename, &dev_num_end, 0);
if (dev_num_end[0] == 0)
{
if (recording)
priv->error = waveInGetDevCapsA(dev, &incaps, sizeof(incaps));
else
priv->error = waveOutGetDevCapsA(dev, &outcaps, sizeof(outcaps));
if (priv->error)
{
lsx_fail_errno(ft, ENODEV, "WaveAudio was unable to find the AUDIODEV %s device \"%s\".", recording ? "input" : "output", ft->filename);
return SOX_EOF;
}
}
else
{
UINT dev_count = recording ? waveInGetNumDevs() : waveOutGetNumDevs();
for (dev = -1; dev == WAVE_MAPPER || dev < dev_count; dev++)
{
if (recording)
{
priv->error = waveInGetDevCapsA(dev, &incaps, sizeof(incaps));
dev_name = incaps.szPname;
}
else
{
priv->error = waveOutGetDevCapsA(dev, &outcaps, sizeof(outcaps));
dev_name = outcaps.szPname;
}
if (priv->error)
{
fail(ft, priv->error, recording ? "waveInGetDevCapsA" : "waveOutGetDevCapsA");
return SOX_EOF;
}
if (!strncasecmp(ft->filename, dev_name, 31))
break;
}
if (dev == dev_count)
{
lsx_fail_errno(ft, ENODEV, "WaveAudio was unable to find the AUDIODEV %s device \"%s\".", recording ? "input" : "output", ft->filename);
return SOX_EOF;
}
}
}
priv->buf_len = sox_globals.bufsiz;
priv->data = lsx_malloc(priv->buf_len * sizeof(int16_t) * num_buffers);
if (!priv->data)
{
lsx_fail_errno(ft, SOX_ENOMEM, "Out of memory.");
return SOX_EOF;
}
priv->block_finished_event = CreateEventA(NULL, FALSE, FALSE, NULL);
if (!priv->block_finished_event)
{
priv->error = GetLastError();
fail(ft, priv->error, "CreateEventA");
stop(ft);
return SOX_EOF;
}
/* Allow simulation of 8-bit audio playback. */
ft->signal.precision = ft->signal.precision >= 16 ? 16 : 8;
fmt.wFormatTag = WAVE_FORMAT_PCM;
fmt.nChannels = ft->signal.channels;
fmt.nSamplesPerSec = (DWORD)ft->signal.rate;
fmt.nAvgBytesPerSec = fmt.nSamplesPerSec * sizeof(int16_t);
fmt.nBlockAlign = fmt.nChannels*sizeof(int16_t);
fmt.wBitsPerSample = sizeof(int16_t)*8;
fmt.cbSize = 0;
if (recording)
priv->error = waveInOpen(&priv->hin, dev, &fmt, (DWORD_PTR)priv->block_finished_event, 0, CALLBACK_EVENT);
else
priv->error = waveOutOpen(&priv->hout, dev, &fmt, (DWORD_PTR)priv->block_finished_event, 0, CALLBACK_EVENT);
if (priv->error != MMSYSERR_NOERROR)
{
fail(ft, priv->error, recording ? "waveInOpen" : "waveOutOpen");
stop(ft);
return SOX_EOF;
}
for (i = 0; i < num_buffers; i++)
{
priv->headers[i].lpData = priv->data + priv->buf_len * sizeof(int16_t) * i;
priv->headers[i].dwBufferLength = priv->buf_len * sizeof(int16_t);
if (recording)
priv->error = waveInPrepareHeader(priv->hin, &priv->headers[i], sizeof(priv->headers[i]));
else
priv->error = waveOutPrepareHeader(priv->hout, &priv->headers[i], sizeof(priv->headers[i]));
if (priv->error != MMSYSERR_NOERROR)
{
fail(ft, priv->error, recording ? "waveInPrepareHeader" : "waveOutPrepareHeader");
stop(ft);
return SOX_EOF;
}
if (recording)
{
priv->error = waveInAddBuffer(priv->hin, &priv->headers[i], sizeof(priv->headers[i]));
if (priv->error != MMSYSERR_NOERROR)
{
fail(ft, priv->error, "waveInAddBuffer");
stop(ft);
return SOX_EOF;
}
}
}
if (recording)
{
priv->error = waveInStart(priv->hin);
if (priv->error != MMSYSERR_NOERROR)
{
fail(ft, priv->error, "waveInStart");
stop(ft);
return SOX_EOF;
}
}
return SOX_SUCCESS;
}
static size_t read(sox_format_t * ft, sox_sample_t* buf, size_t len)
{
size_t copied = 0;
priv_t *priv = (priv_t*)ft->priv;
if (priv == NULL) return SOX_EOF;
while (!priv->error && copied < len)
{
LPWAVEHDR header = &priv->headers[priv->current];
if (0 == (header->dwFlags & WHDR_INQUEUE) ||
0 != (header->dwFlags & WHDR_DONE))
{
size_t length = header->dwBytesRecorded / sizeof(int16_t);
size_t ready = min(len - copied, length - header->dwUser);
size_t i;
for (i = 0; i < ready; ++i)
{
buf[copied++] = SOX_SIGNED_16BIT_TO_SAMPLE(((int16_t *)header->lpData)[header->dwUser++], dummy);
}
if (header->dwUser == length)
{
priv->error = waveInAddBuffer(priv->hin, header, sizeof(*header));
priv->current = (priv->current + 1) % num_buffers;
priv->headers[priv->current].dwUser = 0;
if (priv->error)
{
fail(ft, priv->error, "waveInAddBuffer");
copied = 0;
}
}
}
else
{
WaitForSingleObject(priv->block_finished_event, INFINITE);
}
}
return copied;
}
static size_t write(sox_format_t * ft, const sox_sample_t* buf, size_t len)
{
unsigned clips = 0;
size_t copied = 0;
priv_t *priv = (priv_t*)ft->priv;
if (priv == NULL) return SOX_EOF;
while (!priv->error && copied < len)
{
LPWAVEHDR header = &priv->headers[priv->current];
if (0 == (header->dwFlags & WHDR_INQUEUE) ||
0 != (header->dwFlags & WHDR_DONE))
{
size_t ready = min(len - copied, priv->buf_len - header->dwUser);
size_t i;
if (ft->signal.precision != 8)
{
/* Normal case: Play with 16-bit resolution. */
for (i = 0; i < ready; ++i)
{
SOX_SAMPLE_LOCALS;
((int16_t *)header->lpData)[header->dwUser++] = SOX_SAMPLE_TO_SIGNED_16BIT(buf[copied++], clips);
}
}
else
{
/* Special case: Simulate 8-bit audio playback. */
for (i = 0; i < ready; ++i)
{
SOX_SAMPLE_LOCALS;
((int16_t *)header->lpData)[header->dwUser++] = SOX_SAMPLE_TO_SIGNED_8BIT(buf[copied++], clips) << 8;
}
}
header->dwBufferLength = header->dwUser * sizeof(int16_t);
priv->error = waveOutWrite(priv->hout, header, sizeof(*header));
priv->current = (priv->current + 1) % num_buffers;
priv->headers[priv->current].dwUser = 0;
if (priv->error)
{
fail(ft, priv->error, "waveOutWrite");
copied = 0;
}
}
else
{
WaitForSingleObject(priv->block_finished_event, INFINITE);
}
}
return copied;
}
LSX_FORMAT_HANDLER(waveaudio)
{
static const char * const names[] = {"waveaudio", NULL};
static unsigned const write_encodings[] = {
SOX_ENCODING_SIGN2, 16, 0,
SOX_ENCODING_SIGN2, 8, 0,
0};
static sox_format_handler_t const handler = {SOX_LIB_VERSION_CODE,
"Windows Multimedia Audio", names,
SOX_FILE_DEVICE | SOX_FILE_NOSTDIO,
start, read, stop,
start, write, stop,
NULL, write_encodings, NULL, sizeof(priv_t)
};
return &handler;
}