audio/wavaudio.c

   1 /*
   2  * QEMU WAV audio output driver
   3  *
   4  * Copyright (c) 2004 Vassili Karpov (malc)
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24 #include "vl.h"
  25
  26 #include "audio/audio_int.h"
  27
  28 typedef struct WAVVoice {
  29     HWVoice hw;
  30     QEMUFile *f;
  31     int64_t old_ticks;
  32     void *pcm_buf;
  33     int total_samples;
  34 } WAVVoice;
  35
  36 #define dolog(...) AUD_log ("wav", __VA_ARGS__)
  37 #ifdef DEBUG
  38 #define ldebug(...) dolog (__VA_ARGS__)
  39 #else
  40 #define ldebug(...)
  41 #endif
  42
  43 static struct {
  44     const char *wav_path;
  45 } conf = {
  46     .wav_path = "qemu.wav"
  47 };
  48
  49 static void wav_hw_run (HWVoice *hw)
  50 {
  51     WAVVoice *wav = (WAVVoice *) hw;
  52     int rpos, live, decr, samples;
  53     uint8_t *dst;
  54     st_sample_t *src;
  55     int64_t now = qemu_get_clock (vm_clock);
  56     int64_t ticks = now - wav->old_ticks;
  57     int64_t bytes = (ticks * hw->bytes_per_second) / ticks_per_sec;
  58     wav->old_ticks = now;
  59
  60     if (bytes > INT_MAX)
  61         samples = INT_MAX >> hw->shift;
  62     else
  63         samples = bytes >> hw->shift;
  64
  65     live = pcm_hw_get_live (hw);
  66     if (live <= 0)
  67         return;
  68
  69     decr = audio_MIN (live, samples);
  70     samples = decr;
  71     rpos = hw->rpos;
  72     while (samples) {
  73         int left_till_end_samples = hw->samples - rpos;
  74         int convert_samples = audio_MIN (samples, left_till_end_samples);
  75
  76         src = advance (hw->mix_buf, rpos * sizeof (st_sample_t));
  77         dst = advance (wav->pcm_buf, rpos << hw->shift);
  78
  79         hw->clip (dst, src, convert_samples);
  80         qemu_put_buffer (wav->f, dst, convert_samples << hw->shift);
  81         memset (src, 0, convert_samples * sizeof (st_sample_t));
  82
  83         rpos = (rpos + convert_samples) % hw->samples;
  84         samples -= convert_samples;
  85         wav->total_samples += convert_samples;
  86     }
  87
  88     pcm_hw_dec_live (hw, decr);
  89     hw->rpos = rpos;
  90 }
  91
  92 static int wav_hw_write (SWVoice *sw, void *buf, int len)
  93 {
  94     return pcm_hw_write (sw, buf, len);
  95 }
  96
  97
  98 /* VICE code: Store number as little endian. */
  99 static void le_store (uint8_t *buf, uint32_t val, int len)
 100 {
 101     int i;
 102     for (i = 0; i < len; i++) {
 103         buf[i] = (uint8_t) (val & 0xff);
 104         val >>= 8;
 105     }
 106 }
 107
 108 static int wav_hw_init (HWVoice *hw, int freq, int nchannels, audfmt_e fmt)
 109 {
 110     WAVVoice *wav = (WAVVoice *) hw;
 111     int bits16 = 0, stereo = audio_state.fixed_channels == 2;
 112     uint8_t hdr[] = {
 113         0x52, 0x49, 0x46, 0x46, 0x00, 0x00, 0x00, 0x00, 0x57, 0x41, 0x56,
 114         0x45, 0x66, 0x6d, 0x74, 0x20, 0x10, 0x00, 0x00, 0x00, 0x01, 0x00,
 115         0x02, 0x00, 0x44, 0xac, 0x00, 0x00, 0x10, 0xb1, 0x02, 0x00, 0x04,
 116         0x00, 0x10, 0x00, 0x64, 0x61, 0x74, 0x61, 0x00, 0x00, 0x00, 0x00
 117     };
 118
 119     switch (audio_state.fixed_fmt) {
 120     case AUD_FMT_S8:
 121     case AUD_FMT_U8:
 122         break;
 123
 124     case AUD_FMT_S16:
 125     case AUD_FMT_U16:
 126         bits16 = 1;
 127         break;
 128     }
 129
 130     hdr[34] = bits16 ? 0x10 : 0x08;
 131     hw->freq = 44100;
 132     hw->nchannels = stereo ? 2 : 1;
 133     hw->fmt = bits16 ? AUD_FMT_S16 : AUD_FMT_U8;
 134     hw->bufsize = 4096;
 135     wav->pcm_buf = qemu_mallocz (hw->bufsize);
 136     if (!wav->pcm_buf)
 137         return -1;
 138
 139     le_store (hdr + 22, hw->nchannels, 2);
 140     le_store (hdr + 24, hw->freq, 4);
 141     le_store (hdr + 28, hw->freq << (bits16 + stereo), 4);
 142     le_store (hdr + 32, 1 << (bits16 + stereo), 2);
 143
 144     wav->f = fopen (conf.wav_path, "wb");
 145     if (!wav->f) {
 146         dolog ("failed to open wave file `%s'\nReason: %s\n",
 147                conf.wav_path, strerror (errno));
 148         return -1;
 149     }
 150
 151     qemu_put_buffer (wav->f, hdr, sizeof (hdr));
 152     return 0;
 153 }
 154
 155 static void wav_hw_fini (HWVoice *hw)
 156 {
 157     WAVVoice *wav = (WAVVoice *) hw;
 158     int stereo = hw->nchannels == 2;
 159     uint8_t rlen[4];
 160     uint8_t dlen[4];
 161     uint32_t rifflen = (wav->total_samples << stereo) + 36;
 162     uint32_t datalen = wav->total_samples << stereo;
 163
 164     if (!wav->f || !hw->active)
 165         return;
 166
 167     le_store (rlen, rifflen, 4);
 168     le_store (dlen, datalen, 4);
 169
 170     qemu_fseek (wav->f, 4, SEEK_SET);
 171     qemu_put_buffer (wav->f, rlen, 4);
 172
 173     qemu_fseek (wav->f, 32, SEEK_CUR);
 174     qemu_put_buffer (wav->f, dlen, 4);
 175
 176     fclose (wav->f);
 177     wav->f = NULL;
 178 }
 179
 180 static int wav_hw_ctl (HWVoice *hw, int cmd, ...)
 181 {
 182     (void) hw;
 183     (void) cmd;
 184     return 0;
 185 }
 186
 187 static void *wav_audio_init (void)
 188 {
 189     return &conf;
 190 }
 191
 192 static void wav_audio_fini (void *opaque)
 193 {
 194     ldebug ("wav_fini");
 195 }
 196
 197 struct pcm_ops wav_pcm_ops = {
 198     wav_hw_init,
 199     wav_hw_fini,
 200     wav_hw_run,
 201     wav_hw_write,
 202     wav_hw_ctl
 203 };
 204
 205 struct audio_output_driver wav_output_driver = {
 206     "wav",
 207     wav_audio_init,
 208     wav_audio_fini,
 209     &wav_pcm_ops,
 210     1,
 211     1,
 212     sizeof (WAVVoice)
 213 };