2 * Packed Animation File audio decoder
3 * Copyright (c) 2012 Paul B Mahol
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavutil/intreadwrite.h"
29 static av_cold
int paf_audio_init(AVCodecContext
*avctx
)
31 if (avctx
->channels
!= 2) {
32 av_log(avctx
, AV_LOG_ERROR
, "invalid number of channels\n");
33 return AVERROR_INVALIDDATA
;
36 avctx
->channel_layout
= AV_CH_LAYOUT_STEREO
;
37 avctx
->sample_fmt
= AV_SAMPLE_FMT_S16
;
42 static int paf_audio_decode(AVCodecContext
*avctx
, void *data
,
43 int *got_frame
, AVPacket
*pkt
)
45 AVFrame
*frame
= data
;
46 int16_t *output_samples
;
47 const uint8_t *src
= pkt
->data
;
48 int frames
, ret
, i
, j
;
51 frames
= pkt
->size
/ PAF_SOUND_FRAME_SIZE
;
53 return AVERROR_INVALIDDATA
;
55 frame
->nb_samples
= PAF_SOUND_SAMPLES
* frames
;
56 if ((ret
= ff_get_buffer(avctx
, frame
, 0)) < 0)
59 output_samples
= (int16_t *)frame
->data
[0];
60 // codebook of 256 16-bit samples and 8-bit indices to it
61 for (j
= 0; j
< frames
; j
++) {
62 for (i
= 0; i
< 256; i
++)
63 cb
[i
] = sign_extend(AV_RL16(src
+ i
* 2), 16);
66 for (i
= 0; i
< PAF_SOUND_SAMPLES
* 2; i
++)
67 *output_samples
++ = cb
[*src
++];
74 AVCodec ff_paf_audio_decoder
= {
76 .long_name
= NULL_IF_CONFIG_SMALL("Amazing Studio Packed Animation File Audio"),
77 .type
= AVMEDIA_TYPE_AUDIO
,
78 .id
= AV_CODEC_ID_PAF_AUDIO
,
79 .init
= paf_audio_init
,
80 .decode
= paf_audio_decode
,
81 .capabilities
= CODEC_CAP_DR1
,