mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-21 10:55:51 +02:00
85 lines
2.6 KiB
C
85 lines
2.6 KiB
C
/*
|
|
* Packed Animation File audio decoder
|
|
* Copyright (c) 2012 Paul B Mahol
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* Libav 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
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with Libav; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "libavutil/intreadwrite.h"
|
|
|
|
#include "avcodec.h"
|
|
#include "internal.h"
|
|
#include "mathops.h"
|
|
|
|
#define PAF_SOUND_SAMPLES 2205
|
|
#define PAF_SOUND_FRAME_SIZE ((256 + PAF_SOUND_SAMPLES) * 2)
|
|
|
|
static av_cold int paf_audio_init(AVCodecContext *avctx)
|
|
{
|
|
if (avctx->channels != 2) {
|
|
av_log(avctx, AV_LOG_ERROR, "invalid number of channels\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
avctx->channel_layout = AV_CH_LAYOUT_STEREO;
|
|
avctx->sample_fmt = AV_SAMPLE_FMT_S16;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int paf_audio_decode(AVCodecContext *avctx, void *data,
|
|
int *got_frame, AVPacket *pkt)
|
|
{
|
|
AVFrame *frame = data;
|
|
int16_t *output_samples;
|
|
const uint8_t *src = pkt->data;
|
|
int frames, ret, i, j;
|
|
int16_t cb[256];
|
|
|
|
frames = pkt->size / PAF_SOUND_FRAME_SIZE;
|
|
if (frames < 1)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
frame->nb_samples = PAF_SOUND_SAMPLES * frames;
|
|
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
|
|
return ret;
|
|
|
|
output_samples = (int16_t *)frame->data[0];
|
|
// codebook of 256 16-bit samples and 8-bit indices to it
|
|
for (j = 0; j < frames; j++) {
|
|
for (i = 0; i < 256; i++)
|
|
cb[i] = sign_extend(AV_RL16(src + i * 2), 16);
|
|
src += 256 * 2;
|
|
// always 2 channels
|
|
for (i = 0; i < PAF_SOUND_SAMPLES * 2; i++)
|
|
*output_samples++ = cb[*src++];
|
|
}
|
|
*got_frame = 1;
|
|
|
|
return pkt->size;
|
|
}
|
|
|
|
AVCodec ff_paf_audio_decoder = {
|
|
.name = "paf_audio",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Amazing Studio Packed Animation File Audio"),
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
|
.id = AV_CODEC_ID_PAF_AUDIO,
|
|
.init = paf_audio_init,
|
|
.decode = paf_audio_decode,
|
|
.capabilities = CODEC_CAP_DR1,
|
|
};
|