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/*
* This file is part of mpv.
*
* mpv is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* mpv is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <assert.h>
#include "audio/format.h"
#include "af.h"
static bool test_conversion(int src_format, int dst_format)
{
if (!(src_format & AF_FORMAT_POINT_MASK) == AF_FORMAT_I)
return false;
if ((src_format & ~AF_FORMAT_BITS_MASK) !=
(dst_format & ~AF_FORMAT_BITS_MASK))
return false;
int srcbits = src_format & AF_FORMAT_BITS_MASK;
int dstbits = dst_format & AF_FORMAT_BITS_MASK;
return (srcbits == AF_FORMAT_24BIT && dstbits == AF_FORMAT_32BIT) ||
(srcbits == AF_FORMAT_32BIT && dstbits == AF_FORMAT_24BIT);
}
static int control(struct af_instance *af, int cmd, void *arg)
{
switch (cmd) {
case AF_CONTROL_REINIT: {
struct mp_audio *in = arg;
struct mp_audio orig_in = *in;
struct mp_audio *out = af->data;
if (!test_conversion(in->format, out->format))
return AF_DETACH;
if ((in->format & AF_FORMAT_BITS_MASK) == AF_FORMAT_24BIT) {
mp_audio_set_format(out, af_fmt_change_bits(in->format, 32));
} else if ((in->format & AF_FORMAT_BITS_MASK) == AF_FORMAT_32BIT) {
mp_audio_set_format(out, af_fmt_change_bits(in->format, 24));
} else {
abort();
}
out->rate = in->rate;
mp_audio_set_channels(out, &in->channels);
assert(test_conversion(in->format, out->format));
af->mul = (double)out->bps / in->bps;
return mp_audio_config_equals(in, &orig_in) ? AF_OK : AF_FALSE;
}
case AF_CONTROL_FORMAT_FMT | AF_CONTROL_SET: {
mp_audio_set_format(af->data, *(int*)arg);
return AF_OK;
}
}
return AF_UNKNOWN;
}
// The LSB is always ignored.
#if BYTE_ORDER == BIG_ENDIAN
#define SHIFT(x) ((3-(x))*8)
#else
#define SHIFT(x) (((x)+1)*8)
#endif
static struct mp_audio *play(struct af_instance *af, struct mp_audio *data)
{
if (RESIZE_LOCAL_BUFFER(af, data) != AF_OK)
return NULL;
struct mp_audio *out = af->data;
size_t len = data->len / data->bps;
if (data->bps == 4) {
for (int s = 0; s < len; s++) {
uint32_t val = *((uint32_t *)data->audio + s);
uint8_t *ptr = (uint8_t *)out->audio + s * 3;
ptr[0] = val >> SHIFT(0);
ptr[1] = val >> SHIFT(1);
ptr[2] = val >> SHIFT(2);
}
mp_audio_set_format(data, af_fmt_change_bits(data->format, 24));
} else {
for (int s = 0; s < len; s++) {
uint8_t *ptr = (uint8_t *)data->audio + s * 3;
uint32_t val = ptr[0] << SHIFT(0)
| ptr[1] << SHIFT(1)
| ptr[2] << SHIFT(2);
*((uint32_t *)out->audio + s) = val;
}
mp_audio_set_format(data, af_fmt_change_bits(data->format, 32));
}
data->audio = out->audio;
data->len = len * data->bps;
return data;
}
static void uninit(struct af_instance* af)
{
if (af->data)
free(af->data->audio);
}
static int af_open(struct af_instance *af)
{
af->control = control;
af->play = play;
af->uninit = uninit;
af->data = talloc_zero(af, struct mp_audio);
return AF_OK;
}
struct af_info af_info_convert24 = {
.info = "Convert between 24 and 32 bit sample format",
.name = "convert24",
.open = af_open,
.test_conversion = test_conversion,
};
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