The bit shifting trick worked because the number of bytes per frame was always a power-of-two (since QEMU only supports mono, stereo and 8, 16 and 32 bit samples). But if we want to add support for surround sound, this no longer holds true. Signed-off-by: Kővágó, Zoltán <DirtY.iCE.hu@gmail.com> Message-id: 1351fd9bcce0ff20d81850c5292722194329de02.1570996490.git.DirtY.iCE.hu@gmail.com Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
221 lines
6.2 KiB
C
221 lines
6.2 KiB
C
/*
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* QEMU WAV audio driver
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*
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* Copyright (c) 2004-2005 Vassili Karpov (malc)
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu/osdep.h"
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#include "qemu/host-utils.h"
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#include "qemu/module.h"
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#include "qemu/timer.h"
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#include "qapi/opts-visitor.h"
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#include "audio.h"
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#define AUDIO_CAP "wav"
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#include "audio_int.h"
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typedef struct WAVVoiceOut {
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HWVoiceOut hw;
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FILE *f;
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RateCtl rate;
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int total_samples;
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} WAVVoiceOut;
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static size_t wav_write_out(HWVoiceOut *hw, void *buf, size_t len)
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{
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WAVVoiceOut *wav = (WAVVoiceOut *) hw;
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int64_t bytes = audio_rate_get_bytes(&hw->info, &wav->rate, len);
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assert(bytes % hw->info.bytes_per_frame == 0);
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if (bytes && fwrite(buf, bytes, 1, wav->f) != 1) {
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dolog("wav_write_out: fwrite of %" PRId64 " bytes failed\nReason: %s\n",
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bytes, strerror(errno));
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}
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wav->total_samples += bytes / hw->info.bytes_per_frame;
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return bytes;
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}
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/* VICE code: Store number as little endian. */
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static void le_store (uint8_t *buf, uint32_t val, int len)
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{
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int i;
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for (i = 0; i < len; i++) {
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buf[i] = (uint8_t) (val & 0xff);
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val >>= 8;
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}
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}
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static int wav_init_out(HWVoiceOut *hw, struct audsettings *as,
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void *drv_opaque)
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{
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WAVVoiceOut *wav = (WAVVoiceOut *) hw;
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int bits16 = 0, stereo = 0;
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uint8_t hdr[] = {
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0x52, 0x49, 0x46, 0x46, 0x00, 0x00, 0x00, 0x00, 0x57, 0x41, 0x56,
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0x45, 0x66, 0x6d, 0x74, 0x20, 0x10, 0x00, 0x00, 0x00, 0x01, 0x00,
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0x02, 0x00, 0x44, 0xac, 0x00, 0x00, 0x10, 0xb1, 0x02, 0x00, 0x04,
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0x00, 0x10, 0x00, 0x64, 0x61, 0x74, 0x61, 0x00, 0x00, 0x00, 0x00
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};
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Audiodev *dev = drv_opaque;
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AudiodevWavOptions *wopts = &dev->u.wav;
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struct audsettings wav_as = audiodev_to_audsettings(dev->u.wav.out);
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const char *wav_path = wopts->has_path ? wopts->path : "qemu.wav";
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stereo = wav_as.nchannels == 2;
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switch (wav_as.fmt) {
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case AUDIO_FORMAT_S8:
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case AUDIO_FORMAT_U8:
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bits16 = 0;
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break;
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case AUDIO_FORMAT_S16:
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case AUDIO_FORMAT_U16:
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bits16 = 1;
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break;
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case AUDIO_FORMAT_S32:
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case AUDIO_FORMAT_U32:
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dolog ("WAVE files can not handle 32bit formats\n");
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return -1;
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default:
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abort();
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}
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hdr[34] = bits16 ? 0x10 : 0x08;
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wav_as.endianness = 0;
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audio_pcm_init_info (&hw->info, &wav_as);
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hw->samples = 1024;
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le_store (hdr + 22, hw->info.nchannels, 2);
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le_store (hdr + 24, hw->info.freq, 4);
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le_store (hdr + 28, hw->info.freq << (bits16 + stereo), 4);
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le_store (hdr + 32, 1 << (bits16 + stereo), 2);
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wav->f = fopen(wav_path, "wb");
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if (!wav->f) {
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dolog ("Failed to open wave file `%s'\nReason: %s\n",
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wav_path, strerror(errno));
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return -1;
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}
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if (fwrite (hdr, sizeof (hdr), 1, wav->f) != 1) {
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dolog ("wav_init_out: failed to write header\nReason: %s\n",
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strerror(errno));
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return -1;
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}
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audio_rate_start(&wav->rate);
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return 0;
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}
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static void wav_fini_out (HWVoiceOut *hw)
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{
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WAVVoiceOut *wav = (WAVVoiceOut *) hw;
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uint8_t rlen[4];
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uint8_t dlen[4];
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uint32_t datalen = wav->total_samples * hw->info.bytes_per_frame;
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uint32_t rifflen = datalen + 36;
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if (!wav->f) {
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return;
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}
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le_store (rlen, rifflen, 4);
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le_store (dlen, datalen, 4);
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if (fseek (wav->f, 4, SEEK_SET)) {
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dolog ("wav_fini_out: fseek to rlen failed\nReason: %s\n",
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strerror(errno));
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goto doclose;
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}
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if (fwrite (rlen, 4, 1, wav->f) != 1) {
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dolog ("wav_fini_out: failed to write rlen\nReason: %s\n",
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strerror (errno));
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goto doclose;
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}
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if (fseek (wav->f, 32, SEEK_CUR)) {
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dolog ("wav_fini_out: fseek to dlen failed\nReason: %s\n",
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strerror (errno));
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goto doclose;
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}
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if (fwrite (dlen, 4, 1, wav->f) != 1) {
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dolog ("wav_fini_out: failed to write dlen\nReaons: %s\n",
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strerror (errno));
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goto doclose;
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}
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doclose:
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if (fclose (wav->f)) {
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dolog ("wav_fini_out: fclose %p failed\nReason: %s\n",
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wav->f, strerror (errno));
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}
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wav->f = NULL;
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}
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static void wav_enable_out(HWVoiceOut *hw, bool enable)
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{
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WAVVoiceOut *wav = (WAVVoiceOut *) hw;
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if (enable) {
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audio_rate_start(&wav->rate);
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}
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}
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static void *wav_audio_init(Audiodev *dev)
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{
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assert(dev->driver == AUDIODEV_DRIVER_WAV);
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return dev;
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}
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static void wav_audio_fini (void *opaque)
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{
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ldebug ("wav_fini");
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}
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static struct audio_pcm_ops wav_pcm_ops = {
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.init_out = wav_init_out,
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.fini_out = wav_fini_out,
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.write = wav_write_out,
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.enable_out = wav_enable_out,
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};
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static struct audio_driver wav_audio_driver = {
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.name = "wav",
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.descr = "WAV renderer http://wikipedia.org/wiki/WAV",
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.init = wav_audio_init,
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.fini = wav_audio_fini,
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.pcm_ops = &wav_pcm_ops,
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.can_be_default = 0,
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.max_voices_out = 1,
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.max_voices_in = 0,
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.voice_size_out = sizeof (WAVVoiceOut),
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.voice_size_in = 0
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};
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static void register_audio_wav(void)
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{
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audio_driver_register(&wav_audio_driver);
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}
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type_init(register_audio_wav);
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