mirror of https://gerrit.osmocom.org/gapk
66 lines
1.7 KiB
C
66 lines
1.7 KiB
C
/* RAW PCM output */
|
|
|
|
/*
|
|
* This file is part of gapk (GSM Audio Pocket Knife).
|
|
*
|
|
* gapk 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 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* gapk 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 gapk. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <assert.h>
|
|
|
|
#include <osmocom/gapk/codecs.h>
|
|
#include <osmocom/gapk/formats.h>
|
|
|
|
static int
|
|
rawpcm_s16le_from_canon(uint8_t *dst, const uint8_t *src, unsigned int src_len)
|
|
{
|
|
int i;
|
|
const uint16_t *samples = (const uint16_t *)src;
|
|
|
|
assert(src_len == PCM_CANON_LEN);
|
|
|
|
for (i=0; i<160; i++) {
|
|
uint16_t w = samples[i];
|
|
dst[(i<<1) ] = w & 0xff;
|
|
dst[(i<<1)+1] = (w >> 8) & 0xff;
|
|
}
|
|
|
|
return PCM_CANON_LEN;
|
|
}
|
|
|
|
static int
|
|
rawpcm_s16le_to_canon(uint8_t *dst, const uint8_t *src, unsigned int src_len)
|
|
{
|
|
int i;
|
|
uint16_t *samples = (uint16_t *)dst;
|
|
|
|
assert(src_len == PCM_CANON_LEN);
|
|
|
|
for (i=0; i<160; i++)
|
|
samples[i] = (src[(i<<1)+1] << 8) | src[(i<<1)];
|
|
|
|
return PCM_CANON_LEN;
|
|
}
|
|
|
|
const struct osmo_gapk_format_desc fmt_rawpcm_s16le = {
|
|
.type = FMT_RAWPCM_S16LE,
|
|
.codec_type = CODEC_PCM,
|
|
.name = "rawpcm-s16le",
|
|
.description = "Raw PCM samples Signed 16 bits little endian",
|
|
|
|
.frame_len = PCM_CANON_LEN,
|
|
.conv_from_canon = rawpcm_s16le_from_canon,
|
|
.conv_to_canon = rawpcm_s16le_to_canon,
|
|
};
|