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MusicPal mono playback support.

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git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4332 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
balrog 2008-05-04 15:47:15 +00:00
parent 54585ffec7
commit 4001a81e8e
1 changed files with 29 additions and 14 deletions
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43
hw/musicpal.c
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@ -230,6 +230,7 @@ static i2c_interface *mixer_i2c;
#define MP_AUDIO_16BIT_SAMPLE (1 << 0)
#define MP_AUDIO_PLAYBACK_EN (1 << 7)
#define MP_AUDIO_CLOCK_24MHZ (1 << 9)
#define MP_AUDIO_MONO (1 << 14)
/* Wolfson 8750 I2C address */
#define MP_WM_ADDR 0x34
@ -254,32 +255,46 @@ typedef struct musicpal_audio_state {
static void audio_callback(void *opaque, int free_out, int free_in)
{
musicpal_audio_state *s = opaque;
int16_t *codec_buffer;
int16_t *codec_buffer, *mem_buffer;
int pos, block_size;
if (!(s->playback_mode & MP_AUDIO_PLAYBACK_EN))
return;
if (s->playback_mode & MP_AUDIO_16BIT_SAMPLE)
free_out <<= 2;
else
free_out <<= 1;
if (!(s->playback_mode & MP_AUDIO_MONO))
free_out <<= 1;
block_size = s->threshold/2;
if (free_out - s->last_free < block_size)
return;
if (s->playback_mode & MP_AUDIO_16BIT_SAMPLE)
memcpy(wm8750_dac_buffer(s->wm, block_size >> 2),
(uint32_t *)(s->target_buffer + s->play_pos),
block_size);
else {
codec_buffer = wm8750_dac_buffer(s->wm, block_size >> 1);
for (pos = 0; pos < block_size; pos += 2) {
*codec_buffer++ = cpu_to_le16(256 *
*(int8_t *)(s->target_buffer + s->play_pos + pos));
*codec_buffer++ = cpu_to_le16(256 *
*(int8_t *)(s->target_buffer + s->play_pos + pos + 1));
mem_buffer = s->target_buffer + s->play_pos;
if (s->playback_mode & MP_AUDIO_16BIT_SAMPLE) {
if (s->playback_mode & MP_AUDIO_MONO) {
codec_buffer = wm8750_dac_buffer(s->wm, block_size >> 1);
for (pos = 0; pos < block_size; pos += 2) {
*codec_buffer++ = *mem_buffer;
*codec_buffer++ = *mem_buffer++;
}
} else
memcpy(wm8750_dac_buffer(s->wm, block_size >> 2),
(uint32_t *)mem_buffer, block_size);
} else {
if (s->playback_mode & MP_AUDIO_MONO) {
codec_buffer = wm8750_dac_buffer(s->wm, block_size);
for (pos = 0; pos < block_size; pos++) {
*codec_buffer++ = cpu_to_le16(256 * *((int8_t *)mem_buffer));
*codec_buffer++ = cpu_to_le16(256 * *((int8_t *)mem_buffer)++);
}
} else {
codec_buffer = wm8750_dac_buffer(s->wm, block_size >> 1);
for (pos = 0; pos < block_size; pos += 2) {
*codec_buffer++ = cpu_to_le16(256 * *((int8_t *)mem_buffer)++);
*codec_buffer++ = cpu_to_le16(256 * *((int8_t *)mem_buffer)++);
}
}
}
wm8750_dac_commit(s->wm);