root / audio / wavaudio.c @ 85571bc7
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/*
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* QEMU WAV audio output driver
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*
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* Copyright (c) 2004 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/audio.h" |
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#include "audio/wavaudio.h" |
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static struct { |
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const char *wav_path; |
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} conf = { |
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.wav_path = "qemu.wav"
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}; |
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static void wav_hw_run (HWVoice *hw) |
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{ |
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WAVVoice *wav = (WAVVoice *) 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->bytes_per_second) / ticks_per_sec; |
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wav->old_ticks = now; |
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if (bytes > INT_MAX)
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samples = INT_MAX >> hw->shift; |
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else
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samples = bytes >> hw->shift; |
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live = pcm_hw_get_live (hw); |
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if (live <= 0) |
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return;
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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 = advance (hw->mix_buf, rpos * sizeof (st_sample_t));
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dst = advance (wav->pcm_buf, rpos << hw->shift); |
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hw->clip (dst, src, convert_samples); |
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qemu_put_buffer (wav->f, dst, convert_samples << hw->shift); |
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memset (src, 0, convert_samples * sizeof (st_sample_t)); |
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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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pcm_hw_dec_live (hw, decr); |
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hw->rpos = rpos; |
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} |
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static int wav_hw_write (SWVoice *sw, void *buf, int len) |
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{ |
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return pcm_hw_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_hw_init (HWVoice *hw, int freq, int nchannels, audfmt_e fmt) |
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{ |
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WAVVoice *wav = (WAVVoice *) hw; |
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int bits16 = 0, stereo = audio_state.fixed_channels == 2; |
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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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switch (audio_state.fixed_fmt) {
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case AUD_FMT_S8:
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case AUD_FMT_U8:
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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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hw->freq = 44100;
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hw->nchannels = stereo ? 2 : 1; |
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hw->fmt = bits16 ? AUD_FMT_S16 : AUD_FMT_U8; |
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hw->bufsize = 4096;
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wav->pcm_buf = qemu_mallocz (hw->bufsize); |
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if (!wav->pcm_buf)
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return -1; |
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le_store (hdr + 22, hw->nchannels, 2); |
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le_store (hdr + 24, hw->freq, 4); |
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le_store (hdr + 28, hw->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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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_hw_fini (HWVoice *hw) |
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{ |
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WAVVoice *wav = (WAVVoice *) hw; |
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int stereo = hw->nchannels == 2; |
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uint8_t rlen[4];
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uint8_t dlen[4];
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uint32_t rifflen = (wav->total_samples << stereo) + 36;
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uint32_t datalen = wav->total_samples << stereo; |
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if (!wav->f || !hw->active)
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return;
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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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} |
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static int wav_hw_ctl (HWVoice *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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ldebug ("wav_fini");
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} |
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struct pcm_ops wav_pcm_ops = {
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wav_hw_init, |
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wav_hw_fini, |
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wav_hw_run, |
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wav_hw_write, |
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wav_hw_ctl |
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}; |
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struct audio_output_driver wav_output_driver = {
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"wav",
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wav_audio_init, |
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wav_audio_fini, |
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&wav_pcm_ops, |
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1,
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1,
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sizeof (WAVVoice)
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}; |