mirror of https://gitee.com/openkylin/qemu.git
256 lines
6.7 KiB
C
256 lines
6.7 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 "vl.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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QEMUFile *f;
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int64_t old_ticks;
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void *pcm_buf;
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int total_samples;
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} WAVVoiceOut;
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static struct {
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audsettings_t settings;
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const char *wav_path;
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} conf = {
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{
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44100,
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2,
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AUD_FMT_S16
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},
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"qemu.wav"
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};
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static int wav_run_out (HWVoiceOut *hw)
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{
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WAVVoiceOut *wav = (WAVVoiceOut *) hw;
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int rpos, live, decr, samples;
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uint8_t *dst;
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st_sample_t *src;
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int64_t now = qemu_get_clock (vm_clock);
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int64_t ticks = now - wav->old_ticks;
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int64_t bytes = (ticks * hw->info.bytes_per_second) / ticks_per_sec;
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if (bytes > INT_MAX) {
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samples = INT_MAX >> hw->info.shift;
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}
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else {
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samples = bytes >> hw->info.shift;
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}
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live = audio_pcm_hw_get_live_out (hw);
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if (!live) {
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return 0;
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}
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wav->old_ticks = now;
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decr = audio_MIN (live, samples);
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samples = decr;
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rpos = hw->rpos;
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while (samples) {
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int left_till_end_samples = hw->samples - rpos;
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int convert_samples = audio_MIN (samples, left_till_end_samples);
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src = hw->mix_buf + rpos;
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dst = advance (wav->pcm_buf, rpos << hw->info.shift);
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hw->clip (dst, src, convert_samples);
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qemu_put_buffer (wav->f, dst, convert_samples << hw->info.shift);
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mixeng_clear (src, convert_samples);
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rpos = (rpos + convert_samples) % hw->samples;
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samples -= convert_samples;
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wav->total_samples += convert_samples;
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}
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hw->rpos = rpos;
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return decr;
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}
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static int wav_write_out (SWVoiceOut *sw, void *buf, int len)
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{
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return audio_pcm_sw_write (sw, buf, len);
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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, audsettings_t *as)
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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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audsettings_t wav_as = conf.settings;
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(void) as;
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stereo = wav_as.nchannels == 2;
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switch (wav_as.fmt) {
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case AUD_FMT_S8:
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case AUD_FMT_U8:
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bits16 = 0;
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break;
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case AUD_FMT_S16:
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case AUD_FMT_U16:
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bits16 = 1;
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break;
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}
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hdr[34] = bits16 ? 0x10 : 0x08;
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audio_pcm_init_info (&hw->info, &wav_as, audio_need_to_swap_endian (0));
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hw->samples = 1024;
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wav->pcm_buf = audio_calloc (AUDIO_FUNC, hw->samples, 1 << hw->info.shift);
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if (!wav->pcm_buf) {
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dolog ("Could not allocate buffer (%d bytes)\n",
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hw->samples << hw->info.shift);
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return -1;
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}
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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 (conf.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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conf.wav_path, strerror (errno));
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qemu_free (wav->pcm_buf);
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wav->pcm_buf = NULL;
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return -1;
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}
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qemu_put_buffer (wav->f, hdr, sizeof (hdr));
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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.shift;
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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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qemu_fseek (wav->f, 4, SEEK_SET);
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qemu_put_buffer (wav->f, rlen, 4);
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qemu_fseek (wav->f, 32, SEEK_CUR);
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qemu_put_buffer (wav->f, dlen, 4);
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fclose (wav->f);
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wav->f = NULL;
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qemu_free (wav->pcm_buf);
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wav->pcm_buf = NULL;
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}
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static int wav_ctl_out (HWVoiceOut *hw, int cmd, ...)
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{
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(void) hw;
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(void) cmd;
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return 0;
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}
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static void *wav_audio_init (void)
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{
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return &conf;
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}
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static void wav_audio_fini (void *opaque)
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{
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(void) opaque;
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ldebug ("wav_fini");
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}
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struct audio_option wav_options[] = {
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{"FREQUENCY", AUD_OPT_INT, &conf.settings.freq,
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"Frequency", NULL, 0},
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{"FORMAT", AUD_OPT_FMT, &conf.settings.fmt,
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"Format", NULL, 0},
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{"DAC_FIXED_CHANNELS", AUD_OPT_INT, &conf.settings.nchannels,
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"Number of channels (1 - mono, 2 - stereo)", NULL, 0},
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{"PATH", AUD_OPT_STR, &conf.wav_path,
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"Path to wave file", NULL, 0},
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{NULL, 0, NULL, NULL, NULL, 0}
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};
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struct audio_pcm_ops wav_pcm_ops = {
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wav_init_out,
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wav_fini_out,
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wav_run_out,
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wav_write_out,
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wav_ctl_out,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL
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};
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struct audio_driver wav_audio_driver = {
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INIT_FIELD (name = ) "wav",
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INIT_FIELD (descr = )
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"WAV renderer http://wikipedia.org/wiki/WAV",
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INIT_FIELD (options = ) wav_options,
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INIT_FIELD (init = ) wav_audio_init,
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INIT_FIELD (fini = ) wav_audio_fini,
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INIT_FIELD (pcm_ops = ) &wav_pcm_ops,
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INIT_FIELD (can_be_default = ) 0,
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INIT_FIELD (max_voices_out = ) 1,
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INIT_FIELD (max_voices_in = ) 0,
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INIT_FIELD (voice_size_out = ) sizeof (WAVVoiceOut),
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INIT_FIELD (voice_size_in = ) 0
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};
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