Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / adxdec.c
CommitLineData
2ba45a60
DM
1/*
2 * ADX ADPCM codecs
3 * Copyright (c) 2001,2003 BERO
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#include "avcodec.h"
24#include "adx.h"
25#include "get_bits.h"
26#include "internal.h"
27
28/**
29 * @file
30 * SEGA CRI adx codecs.
31 *
32 * Reference documents:
33 * http://ku-www.ss.titech.ac.jp/~yatsushi/adx.html
34 * adx2wav & wav2adx http://www.geocities.co.jp/Playtown/2004/
35 */
36
37static av_cold int adx_decode_init(AVCodecContext *avctx)
38{
39 ADXContext *c = avctx->priv_data;
40 int ret, header_size;
41
42 if (avctx->extradata_size >= 24) {
43 if ((ret = ff_adx_decode_header(avctx, avctx->extradata,
44 avctx->extradata_size, &header_size,
45 c->coeff)) < 0) {
46 av_log(avctx, AV_LOG_ERROR, "error parsing ADX header\n");
47 return AVERROR_INVALIDDATA;
48 }
49 c->channels = avctx->channels;
50 c->header_parsed = 1;
51 }
52
53 avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
54
55 return 0;
56}
57
58/**
59 * Decode 32 samples from 18 bytes.
60 *
61 * A 16-bit scalar value is applied to 32 residuals, which then have a
62 * 2nd-order LPC filter applied to it to form the output signal for a single
63 * channel.
64 */
65static int adx_decode(ADXContext *c, int16_t *out, int offset,
66 const uint8_t *in, int ch)
67{
68 ADXChannelState *prev = &c->prev[ch];
69 GetBitContext gb;
70 int scale = AV_RB16(in);
71 int i;
72 int s0, s1, s2, d;
73
74 /* check if this is an EOF packet */
75 if (scale & 0x8000)
76 return -1;
77
78 init_get_bits(&gb, in + 2, (BLOCK_SIZE - 2) * 8);
79 out += offset;
80 s1 = prev->s1;
81 s2 = prev->s2;
82 for (i = 0; i < BLOCK_SAMPLES; i++) {
83 d = get_sbits(&gb, 4);
84 s0 = ((d << COEFF_BITS) * scale + c->coeff[0] * s1 + c->coeff[1] * s2) >> COEFF_BITS;
85 s2 = s1;
86 s1 = av_clip_int16(s0);
87 *out++ = s1;
88 }
89 prev->s1 = s1;
90 prev->s2 = s2;
91
92 return 0;
93}
94
95static int adx_decode_frame(AVCodecContext *avctx, void *data,
96 int *got_frame_ptr, AVPacket *avpkt)
97{
98 AVFrame *frame = data;
99 int buf_size = avpkt->size;
100 ADXContext *c = avctx->priv_data;
101 int16_t **samples;
102 int samples_offset;
103 const uint8_t *buf = avpkt->data;
104 const uint8_t *buf_end = buf + avpkt->size;
105 int num_blocks, ch, ret;
106
107 if (c->eof) {
108 *got_frame_ptr = 0;
109 return buf_size;
110 }
111
112 if (!c->header_parsed && buf_size >= 2 && AV_RB16(buf) == 0x8000) {
113 int header_size;
114 if ((ret = ff_adx_decode_header(avctx, buf, buf_size, &header_size,
115 c->coeff)) < 0) {
116 av_log(avctx, AV_LOG_ERROR, "error parsing ADX header\n");
117 return AVERROR_INVALIDDATA;
118 }
119 c->channels = avctx->channels;
120 c->header_parsed = 1;
121 if (buf_size < header_size)
122 return AVERROR_INVALIDDATA;
123 buf += header_size;
124 buf_size -= header_size;
125 }
126 if (!c->header_parsed)
127 return AVERROR_INVALIDDATA;
128
129 /* calculate number of blocks in the packet */
130 num_blocks = buf_size / (BLOCK_SIZE * c->channels);
131
132 /* if the packet is not an even multiple of BLOCK_SIZE, check for an EOF
133 packet */
134 if (!num_blocks || buf_size % (BLOCK_SIZE * avctx->channels)) {
135 if (buf_size >= 4 && (AV_RB16(buf) & 0x8000)) {
136 c->eof = 1;
137 *got_frame_ptr = 0;
138 return avpkt->size;
139 }
140 return AVERROR_INVALIDDATA;
141 }
142
143 /* get output buffer */
144 frame->nb_samples = num_blocks * BLOCK_SAMPLES;
145 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
146 return ret;
147 samples = (int16_t **)frame->extended_data;
148 samples_offset = 0;
149
150 while (num_blocks--) {
151 for (ch = 0; ch < c->channels; ch++) {
152 if (buf_end - buf < BLOCK_SIZE || adx_decode(c, samples[ch], samples_offset, buf, ch)) {
153 c->eof = 1;
154 buf = avpkt->data + avpkt->size;
155 break;
156 }
157 buf_size -= BLOCK_SIZE;
158 buf += BLOCK_SIZE;
159 }
160 if (!c->eof)
161 samples_offset += BLOCK_SAMPLES;
162 }
163
164 frame->nb_samples = samples_offset;
165 *got_frame_ptr = 1;
166
167 return buf - avpkt->data;
168}
169
170static void adx_decode_flush(AVCodecContext *avctx)
171{
172 ADXContext *c = avctx->priv_data;
173 memset(c->prev, 0, sizeof(c->prev));
174 c->eof = 0;
175}
176
177AVCodec ff_adpcm_adx_decoder = {
178 .name = "adpcm_adx",
179 .long_name = NULL_IF_CONFIG_SMALL("SEGA CRI ADX ADPCM"),
180 .type = AVMEDIA_TYPE_AUDIO,
181 .id = AV_CODEC_ID_ADPCM_ADX,
182 .priv_data_size = sizeof(ADXContext),
183 .init = adx_decode_init,
184 .decode = adx_decode_frame,
185 .flush = adx_decode_flush,
186 .capabilities = CODEC_CAP_DR1,
187 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
188 AV_SAMPLE_FMT_NONE },
189};