qemu/audio/wavaudio.c

218 lines
5.6 KiB
C
Raw Normal View History

/*
* QEMU WAV audio output driver
*
* Copyright (c) 2004 Vassili Karpov (malc)
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "vl.h"
#include "audio/audio_int.h"
typedef struct WAVVoice {
HWVoice hw;
QEMUFile *f;
int64_t old_ticks;
void *pcm_buf;
int total_samples;
} WAVVoice;
#define dolog(...) AUD_log ("wav", __VA_ARGS__)
#ifdef DEBUG
#define ldebug(...) dolog (__VA_ARGS__)
#else
#define ldebug(...)
#endif
static struct {
const char *wav_path;
} conf = {
.wav_path = "qemu.wav"
};
static void wav_hw_run (HWVoice *hw)
{
WAVVoice *wav = (WAVVoice *) hw;
int rpos, live, decr, samples;
uint8_t *dst;
st_sample_t *src;
int64_t now = qemu_get_clock (vm_clock);
int64_t ticks = now - wav->old_ticks;
int64_t bytes = (ticks * hw->bytes_per_second) / ticks_per_sec;
if (bytes > INT_MAX)
samples = INT_MAX >> hw->shift;
else
samples = bytes >> hw->shift;
live = pcm_hw_get_live (hw);
if (live <= 0)
return;
wav->old_ticks = now;
decr = audio_MIN (live, samples);
samples = decr;
rpos = hw->rpos;
while (samples) {
int left_till_end_samples = hw->samples - rpos;
int convert_samples = audio_MIN (samples, left_till_end_samples);
src = advance (hw->mix_buf, rpos * sizeof (st_sample_t));
dst = advance (wav->pcm_buf, rpos << hw->shift);
hw->clip (dst, src, convert_samples);
qemu_put_buffer (wav->f, dst, convert_samples << hw->shift);
memset (src, 0, convert_samples * sizeof (st_sample_t));
rpos = (rpos + convert_samples) % hw->samples;
samples -= convert_samples;
wav->total_samples += convert_samples;
}
pcm_hw_dec_live (hw, decr);
hw->rpos = rpos;
}
static int wav_hw_write (SWVoice *sw, void *buf, int len)
{
return pcm_hw_write (sw, buf, len);
}
/* VICE code: Store number as little endian. */
static void le_store (uint8_t *buf, uint32_t val, int len)
{
int i;
for (i = 0; i < len; i++) {
buf[i] = (uint8_t) (val & 0xff);
val >>= 8;
}
}
static int wav_hw_init (HWVoice *hw, int freq, int nchannels, audfmt_e fmt)
{
WAVVoice *wav = (WAVVoice *) hw;
int bits16 = 0, stereo = audio_state.fixed_channels == 2;
uint8_t hdr[] = {
0x52, 0x49, 0x46, 0x46, 0x00, 0x00, 0x00, 0x00, 0x57, 0x41, 0x56,
0x45, 0x66, 0x6d, 0x74, 0x20, 0x10, 0x00, 0x00, 0x00, 0x01, 0x00,
0x02, 0x00, 0x44, 0xac, 0x00, 0x00, 0x10, 0xb1, 0x02, 0x00, 0x04,
0x00, 0x10, 0x00, 0x64, 0x61, 0x74, 0x61, 0x00, 0x00, 0x00, 0x00
};
switch (audio_state.fixed_fmt) {
case AUD_FMT_S8:
case AUD_FMT_U8:
break;
case AUD_FMT_S16:
case AUD_FMT_U16:
bits16 = 1;
break;
}
hdr[34] = bits16 ? 0x10 : 0x08;
hw->freq = 44100;
hw->nchannels = stereo ? 2 : 1;
hw->fmt = bits16 ? AUD_FMT_S16 : AUD_FMT_U8;
hw->bufsize = 4096;
wav->pcm_buf = qemu_mallocz (hw->bufsize);
if (!wav->pcm_buf)
return -1;
le_store (hdr + 22, hw->nchannels, 2);
le_store (hdr + 24, hw->freq, 4);
le_store (hdr + 28, hw->freq << (bits16 + stereo), 4);
le_store (hdr + 32, 1 << (bits16 + stereo), 2);
wav->f = fopen (conf.wav_path, "wb");
if (!wav->f) {
dolog ("failed to open wave file `%s'\nReason: %s\n",
conf.wav_path, strerror (errno));
qemu_free (wav->pcm_buf);
wav->pcm_buf = NULL;
return -1;
}
qemu_put_buffer (wav->f, hdr, sizeof (hdr));
return 0;
}
static void wav_hw_fini (HWVoice *hw)
{
WAVVoice *wav = (WAVVoice *) hw;
int stereo = hw->nchannels == 2;
uint8_t rlen[4];
uint8_t dlen[4];
uint32_t rifflen = (wav->total_samples << stereo) + 36;
uint32_t datalen = wav->total_samples << stereo;
if (!wav->f || !hw->active)
return;
le_store (rlen, rifflen, 4);
le_store (dlen, datalen, 4);
qemu_fseek (wav->f, 4, SEEK_SET);
qemu_put_buffer (wav->f, rlen, 4);
qemu_fseek (wav->f, 32, SEEK_CUR);
qemu_put_buffer (wav->f, dlen, 4);
fclose (wav->f);
wav->f = NULL;
qemu_free (wav->pcm_buf);
wav->pcm_buf = NULL;
}
static int wav_hw_ctl (HWVoice *hw, int cmd, ...)
{
(void) hw;
(void) cmd;
return 0;
}
static void *wav_audio_init (void)
{
return &conf;
}
static void wav_audio_fini (void *opaque)
{
ldebug ("wav_fini");
}
struct pcm_ops wav_pcm_ops = {
wav_hw_init,
wav_hw_fini,
wav_hw_run,
wav_hw_write,
wav_hw_ctl
};
struct audio_output_driver wav_output_driver = {
"wav",
wav_audio_init,
wav_audio_fini,
&wav_pcm_ops,
1,
1,
sizeof (WAVVoice)
};