mirror of
https://github.com/pineappleEA/pineapple-src.git
synced 2024-12-05 18:48:25 -05:00
90 lines
2.8 KiB
C
Executable File
90 lines
2.8 KiB
C
Executable File
/*
|
|
* Discworld II BMV audio decoder
|
|
* Copyright (c) 2011 Konstantin Shishkov
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg 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.
|
|
*
|
|
* FFmpeg 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 FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "libavutil/channel_layout.h"
|
|
#include "libavutil/common.h"
|
|
|
|
#include "avcodec.h"
|
|
#include "internal.h"
|
|
|
|
static const int bmv_aud_mults[16] = {
|
|
16512, 8256, 4128, 2064, 1032, 516, 258, 192, 129, 88, 64, 56, 48, 40, 36, 32
|
|
};
|
|
|
|
static av_cold int bmv_aud_decode_init(AVCodecContext *avctx)
|
|
{
|
|
avctx->channels = 2;
|
|
avctx->channel_layout = AV_CH_LAYOUT_STEREO;
|
|
avctx->sample_fmt = AV_SAMPLE_FMT_S16;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bmv_aud_decode_frame(AVCodecContext *avctx, void *data,
|
|
int *got_frame_ptr, AVPacket *avpkt)
|
|
{
|
|
AVFrame *frame = data;
|
|
const uint8_t *buf = avpkt->data;
|
|
int buf_size = avpkt->size;
|
|
int blocks = 0, total_blocks, i;
|
|
int ret;
|
|
int16_t *output_samples;
|
|
int scale[2];
|
|
|
|
total_blocks = *buf++;
|
|
if (buf_size < total_blocks * 65 + 1) {
|
|
av_log(avctx, AV_LOG_ERROR, "expected %d bytes, got %d\n",
|
|
total_blocks * 65 + 1, buf_size);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
/* get output buffer */
|
|
frame->nb_samples = total_blocks * 32;
|
|
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
|
|
return ret;
|
|
output_samples = (int16_t *)frame->data[0];
|
|
|
|
for (blocks = 0; blocks < total_blocks; blocks++) {
|
|
uint8_t code = *buf++;
|
|
code = (code >> 1) | (code << 7);
|
|
scale[0] = bmv_aud_mults[code & 0xF];
|
|
scale[1] = bmv_aud_mults[code >> 4];
|
|
for (i = 0; i < 32; i++) {
|
|
*output_samples++ = av_clip_int16((scale[0] * (int8_t)*buf++) >> 5);
|
|
*output_samples++ = av_clip_int16((scale[1] * (int8_t)*buf++) >> 5);
|
|
}
|
|
}
|
|
|
|
*got_frame_ptr = 1;
|
|
|
|
return buf_size;
|
|
}
|
|
|
|
AVCodec ff_bmv_audio_decoder = {
|
|
.name = "bmv_audio",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Discworld II BMV audio"),
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
|
.id = AV_CODEC_ID_BMV_AUDIO,
|
|
.init = bmv_aud_decode_init,
|
|
.decode = bmv_aud_decode_frame,
|
|
.capabilities = AV_CODEC_CAP_DR1,
|
|
};
|