Archipelago » qemu

/*

 * QEMU WAV audio driver

 *

 * Copyright (c) 2004-2005 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 "hw/hw.h"

#include "qemu-timer.h"

#include "audio.h"

#define AUDIO_CAP "wav"

#include "audio_int.h"

typedef struct WAVVoiceOut {

    HWVoiceOut hw;

    QEMUFile *f;

    int64_t old_ticks;

    void *pcm_buf;

    int total_samples;

} WAVVoiceOut;

static struct {

    struct audsettings settings;

    const char *wav_path;

} conf = {

    .settings.freq      = 44100,

    .settings.nchannels = 2,

    .settings.fmt       = AUD_FMT_S16,

    .wav_path           = "qemu.wav"

};

static int wav_run_out (HWVoiceOut *hw, int live)

{

    WAVVoiceOut *wav = (WAVVoiceOut *) hw;

    int rpos, decr, samples;

    uint8_t *dst;

    struct st_sample *src;

    int64_t now = qemu_get_clock (vm_clock);

    int64_t ticks = now - wav->old_ticks;

    int64_t bytes =

        muldiv64 (ticks, hw->info.bytes_per_second, get_ticks_per_sec ());

    if (bytes > INT_MAX) {

        samples = INT_MAX >> hw->info.shift;

    }

    else {

        samples = bytes >> hw->info.shift;

    }

    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 = hw->mix_buf + rpos;

        dst = advance (wav->pcm_buf, rpos << hw->info.shift);

        hw->clip (dst, src, convert_samples);

        qemu_put_buffer (wav->f, dst, convert_samples << hw->info.shift);

        rpos = (rpos + convert_samples) % hw->samples;

        samples -= convert_samples;

        wav->total_samples += convert_samples;

    }

    hw->rpos = rpos;

    return decr;

}

static int wav_write_out (SWVoiceOut *sw, void *buf, int len)

{

    return audio_pcm_sw_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_init_out (HWVoiceOut *hw, struct audsettings *as)

{

    WAVVoiceOut *wav = (WAVVoiceOut *) hw;

    int bits16 = 0, stereo = 0;

    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

    };

    struct audsettings wav_as = conf.settings;

    (void) as;

    stereo = wav_as.nchannels == 2;

    switch (wav_as.fmt) {

    case AUD_FMT_S8:

    case AUD_FMT_U8:

        bits16 = 0;

        break;

    case AUD_FMT_S16:

    case AUD_FMT_U16:

        bits16 = 1;

        break;

    case AUD_FMT_S32:

    case AUD_FMT_U32:

        dolog ("WAVE files can not handle 32bit formats\n");

        return -1;

    }

    hdr[34] = bits16 ? 0x10 : 0x08;

    wav_as.endianness = 0;

    audio_pcm_init_info (&hw->info, &wav_as);

    hw->samples = 1024;

    wav->pcm_buf = audio_calloc (AUDIO_FUNC, hw->samples, 1 << hw->info.shift);

    if (!wav->pcm_buf) {

        dolog ("Could not allocate buffer (%d bytes)\n",

               hw->samples << hw->info.shift);

        return -1;

    }

    le_store (hdr + 22, hw->info.nchannels, 2);

    le_store (hdr + 24, hw->info.freq, 4);

    le_store (hdr + 28, hw->info.freq << (bits16 + stereo), 4);

    le_store (hdr + 32, 1 << (bits16 + stereo), 2);

    wav->f = qemu_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_fini_out (HWVoiceOut *hw)

{

    WAVVoiceOut *wav = (WAVVoiceOut *) hw;

    uint8_t rlen[4];

    uint8_t dlen[4];

    uint32_t datalen = wav->total_samples << hw->info.shift;

    uint32_t rifflen = datalen + 36;

    if (!wav->f) {

        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);

    qemu_fclose (wav->f);

    wav->f = NULL;

    qemu_free (wav->pcm_buf);

    wav->pcm_buf = NULL;

}

static int wav_ctl_out (HWVoiceOut *hw, int cmd, ...)

{

    (void) hw;

    (void) cmd;

    return 0;

}

static void *wav_audio_init (void)

{

    return &conf;

}

static void wav_audio_fini (void *opaque)

{

    (void) opaque;

    ldebug ("wav_fini");

}

static struct audio_option wav_options[] = {

    {

        .name  = "FREQUENCY",

        .tag   = AUD_OPT_INT,

        .valp  = &conf.settings.freq,

        .descr = "Frequency"

    },

    {

        .name  = "FORMAT",

        .tag   = AUD_OPT_FMT,

        .valp  = &conf.settings.fmt,

        .descr = "Format"

    },

    {

        .name  = "DAC_FIXED_CHANNELS",

        .tag   = AUD_OPT_INT,

        .valp  = &conf.settings.nchannels,

        .descr = "Number of channels (1 - mono, 2 - stereo)"

    },

    {

        .name  = "PATH",

        .tag   = AUD_OPT_STR,

        .valp  = &conf.wav_path,

        .descr = "Path to wave file"

    },

    { /* End of list */ }

};

static struct audio_pcm_ops wav_pcm_ops = {

    .init_out = wav_init_out,

    .fini_out = wav_fini_out,

    .run_out  = wav_run_out,

    .write    = wav_write_out,

    .ctl_out  = wav_ctl_out,

};

struct audio_driver wav_audio_driver = {

    .name           = "wav",

    .descr          = "WAV renderer http://wikipedia.org/wiki/WAV",

    .options        = wav_options,

    .init           = wav_audio_init,

    .fini           = wav_audio_fini,

    .pcm_ops        = &wav_pcm_ops,

    .can_be_default = 0,

    .max_voices_out = 1,

    .max_voices_in  = 0,

    .voice_size_out = sizeof (WAVVoiceOut),

    .voice_size_in  = 0

};