blob: 12f473ae0ac5ed7a85278821d73648346b60138a
1 | /* |
2 | * Packed Animation File audio decoder |
3 | * Copyright (c) 2012 Paul B Mahol |
4 | * |
5 | * This file is part of FFmpeg. |
6 | * |
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. |
11 | * |
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. |
16 | * |
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 |
20 | */ |
21 | |
22 | #include "libavutil/intreadwrite.h" |
23 | |
24 | #include "avcodec.h" |
25 | #include "internal.h" |
26 | #include "mathops.h" |
27 | #include "paf.h" |
28 | |
29 | static av_cold int paf_audio_init(AVCodecContext *avctx) |
30 | { |
31 | if (avctx->channels != 2) { |
32 | av_log(avctx, AV_LOG_ERROR, "invalid number of channels\n"); |
33 | return AVERROR_INVALIDDATA; |
34 | } |
35 | |
36 | avctx->channel_layout = AV_CH_LAYOUT_STEREO; |
37 | avctx->sample_fmt = AV_SAMPLE_FMT_S16; |
38 | |
39 | return 0; |
40 | } |
41 | |
42 | static int paf_audio_decode(AVCodecContext *avctx, void *data, |
43 | int *got_frame, AVPacket *pkt) |
44 | { |
45 | AVFrame *frame = data; |
46 | int16_t *output_samples; |
47 | const uint8_t *src = pkt->data; |
48 | int frames, ret, i, j; |
49 | int16_t cb[256]; |
50 | |
51 | frames = pkt->size / PAF_SOUND_FRAME_SIZE; |
52 | if (frames < 1) |
53 | return AVERROR_INVALIDDATA; |
54 | |
55 | frame->nb_samples = PAF_SOUND_SAMPLES * frames; |
56 | if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
57 | return ret; |
58 | |
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); |
64 | src += 256 * 2; |
65 | // always 2 channels |
66 | for (i = 0; i < PAF_SOUND_SAMPLES * 2; i++) |
67 | *output_samples++ = cb[*src++]; |
68 | } |
69 | *got_frame = 1; |
70 | |
71 | return pkt->size; |
72 | } |
73 | |
74 | AVCodec ff_paf_audio_decoder = { |
75 | .name = "paf_audio", |
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 = AV_CODEC_CAP_DR1, |
82 | }; |
83 |