lavc: add AV prefix to codec ids.
[libav.git] / libavcodec / 8svx.c
CommitLineData
cb21e0a7 1/*
4477dedc 2 * 8SVX audio decoder
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3 * Copyright (C) 2008 Jaikrishnan Menon
4 *
2912e87a 5 * This file is part of Libav.
cb21e0a7 6 *
2912e87a 7 * Libav is free software; you can redistribute it and/or
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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 *
2912e87a 12 * Libav is distributed in the hope that it will be useful,
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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
2912e87a 18 * License along with Libav; if not, write to the Free Software
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19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22/**
ba87f080 23 * @file
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24 * 8svx audio decoder
25 * @author Jaikrishnan Menon
ec679eb4 26 *
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27 * supports: fibonacci delta encoding
28 * : exponential encoding
29 */
30
31#include "avcodec.h"
32
1b41f260 33/** decoder context */
cb21e0a7 34typedef struct EightSvxContext {
0eea2129 35 AVFrame frame;
1993c684 36 uint8_t fib_acc[2];
e3718784 37 const int8_t *table;
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38
39 /* buffer used to store the whole first packet.
40 data is only sent as one large packet */
41 uint8_t *data[2];
42 int data_size;
43 int data_idx;
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44} EightSvxContext;
45
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46static const int8_t fibonacci[16] = { -34, -21, -13, -8, -5, -3, -2, -1,
47 0, 1, 2, 3, 5, 8, 13, 21 };
48static const int8_t exponential[16] = { -128, -64, -32, -16, -8, -4, -2, -1,
49 0, 1, 2, 4, 8, 16, 32, 64 };
cb21e0a7 50
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51#define MAX_FRAME_SIZE 32768
52
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53/**
54 * Delta decode the compressed values in src, and put the resulting
55 * decoded samples in dst.
56 *
57 * @param[in,out] state starting value. it is saved for use in the next call.
58 */
e3718784 59static void delta_decode(uint8_t *dst, const uint8_t *src, int src_size,
1993c684 60 uint8_t *state, const int8_t *table, int channels)
ac68607b 61{
e3718784 62 uint8_t val = *state;
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63
64 while (src_size--) {
65 uint8_t d = *src++;
e3718784 66 val = av_clip_uint8(val + table[d & 0xF]);
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67 *dst = val;
68 dst += channels;
e3718784 69 val = av_clip_uint8(val + table[d >> 4]);
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70 *dst = val;
71 dst += channels;
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72 }
73
74 *state = val;
75}
76
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77static void raw_decode(uint8_t *dst, const int8_t *src, int src_size,
78 int channels)
79{
80 while (src_size--) {
81 *dst = *src++ + 128;
82 dst += channels;
83 }
84}
85
1b41f260 86/** decode a frame */
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87static int eightsvx_decode_frame(AVCodecContext *avctx, void *data,
88 int *got_frame_ptr, AVPacket *avpkt)
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89{
90 EightSvxContext *esc = avctx->priv_data;
1993c684 91 int buf_size;
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92 uint8_t *out_data;
93 int ret;
f1f6d361 94 int is_compr = (avctx->codec_id != CODEC_ID_PCM_S8_PLANAR);
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95
96 /* for the first packet, copy data to buffer */
97 if (avpkt->data) {
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98 int hdr_size = is_compr ? 2 : 0;
99 int chan_size = (avpkt->size - hdr_size * avctx->channels) / avctx->channels;
cb21e0a7 100
f1f6d361 101 if (avpkt->size < hdr_size * avctx->channels) {
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102 av_log(avctx, AV_LOG_ERROR, "packet size is too small\n");
103 return AVERROR(EINVAL);
104 }
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105 if (esc->data[0]) {
106 av_log(avctx, AV_LOG_ERROR, "unexpected data after first packet\n");
107 return AVERROR(EINVAL);
108 }
109
f1f6d361 110 if (is_compr) {
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111 esc->fib_acc[0] = avpkt->data[1] + 128;
112 if (avctx->channels == 2)
113 esc->fib_acc[1] = avpkt->data[2+chan_size+1] + 128;
f1f6d361 114 }
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115
116 esc->data_idx = 0;
117 esc->data_size = chan_size;
118 if (!(esc->data[0] = av_malloc(chan_size)))
119 return AVERROR(ENOMEM);
120 if (avctx->channels == 2) {
121 if (!(esc->data[1] = av_malloc(chan_size))) {
122 av_freep(&esc->data[0]);
123 return AVERROR(ENOMEM);
124 }
125 }
f1f6d361 126 memcpy(esc->data[0], &avpkt->data[hdr_size], chan_size);
1993c684 127 if (avctx->channels == 2)
f1f6d361 128 memcpy(esc->data[1], &avpkt->data[2*hdr_size+chan_size], chan_size);
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129 }
130 if (!esc->data[0]) {
131 av_log(avctx, AV_LOG_ERROR, "unexpected empty packet\n");
132 return AVERROR(EINVAL);
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133 }
134
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135 /* decode next piece of data from the buffer */
136 buf_size = FFMIN(MAX_FRAME_SIZE, esc->data_size - esc->data_idx);
137 if (buf_size <= 0) {
0eea2129 138 *got_frame_ptr = 0;
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139 return avpkt->size;
140 }
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141
142 /* get output buffer */
143 esc->frame.nb_samples = buf_size * (is_compr + 1);
144 if ((ret = avctx->get_buffer(avctx, &esc->frame)) < 0) {
145 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
146 return ret;
fda459ce 147 }
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148 out_data = esc->frame.data[0];
149
f1f6d361 150 if (is_compr) {
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151 delta_decode(out_data, &esc->data[0][esc->data_idx], buf_size,
152 &esc->fib_acc[0], esc->table, avctx->channels);
153 if (avctx->channels == 2) {
154 delta_decode(&out_data[1], &esc->data[1][esc->data_idx], buf_size,
155 &esc->fib_acc[1], esc->table, avctx->channels);
156 }
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157 } else {
158 int ch;
159 for (ch = 0; ch < avctx->channels; ch++) {
160 raw_decode((int8_t *)&out_data[ch], &esc->data[ch][esc->data_idx],
161 buf_size, avctx->channels);
162 }
163 }
1993c684 164 esc->data_idx += buf_size;
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165
166 *got_frame_ptr = 1;
167 *(AVFrame *)data = esc->frame;
cb21e0a7 168
1993c684 169 return avpkt->size;
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170}
171
1b41f260 172/** initialize 8svx decoder */
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173static av_cold int eightsvx_decode_init(AVCodecContext *avctx)
174{
175 EightSvxContext *esc = avctx->priv_data;
176
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177 if (avctx->channels < 1 || avctx->channels > 2) {
178 av_log(avctx, AV_LOG_ERROR, "8SVX does not support more than 2 channels\n");
179 return AVERROR(EINVAL);
180 }
181
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182 switch(avctx->codec->id) {
183 case CODEC_ID_8SVX_FIB:
184 esc->table = fibonacci;
185 break;
186 case CODEC_ID_8SVX_EXP:
187 esc->table = exponential;
188 break;
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189 case CODEC_ID_PCM_S8_PLANAR:
190 break;
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191 default:
192 return -1;
193 }
e3718784 194 avctx->sample_fmt = AV_SAMPLE_FMT_U8;
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195
196 avcodec_get_frame_defaults(&esc->frame);
197 avctx->coded_frame = &esc->frame;
198
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199 return 0;
200}
201
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202static av_cold int eightsvx_decode_close(AVCodecContext *avctx)
203{
204 EightSvxContext *esc = avctx->priv_data;
205
206 av_freep(&esc->data[0]);
207 av_freep(&esc->data[1]);
208
209 return 0;
210}
211
d36beb3f 212AVCodec ff_eightsvx_fib_decoder = {
99e3913d 213 .name = "8svx_fib",
72415b2a 214 .type = AVMEDIA_TYPE_AUDIO,
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215 .id = CODEC_ID_8SVX_FIB,
216 .priv_data_size = sizeof (EightSvxContext),
217 .init = eightsvx_decode_init,
1993c684 218 .close = eightsvx_decode_close,
cb21e0a7 219 .decode = eightsvx_decode_frame,
0eea2129 220 .capabilities = CODEC_CAP_DELAY | CODEC_CAP_DR1,
fe4bf374 221 .long_name = NULL_IF_CONFIG_SMALL("8SVX fibonacci"),
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222};
223
d36beb3f 224AVCodec ff_eightsvx_exp_decoder = {
99e3913d 225 .name = "8svx_exp",
72415b2a 226 .type = AVMEDIA_TYPE_AUDIO,
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227 .id = CODEC_ID_8SVX_EXP,
228 .priv_data_size = sizeof (EightSvxContext),
229 .init = eightsvx_decode_init,
1993c684 230 .close = eightsvx_decode_close,
cb21e0a7 231 .decode = eightsvx_decode_frame,
0eea2129 232 .capabilities = CODEC_CAP_DELAY | CODEC_CAP_DR1,
fe4bf374 233 .long_name = NULL_IF_CONFIG_SMALL("8SVX exponential"),
cb21e0a7 234};
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235
236AVCodec ff_pcm_s8_planar_decoder = {
237 .name = "pcm_s8_planar",
238 .type = AVMEDIA_TYPE_AUDIO,
239 .id = CODEC_ID_PCM_S8_PLANAR,
240 .priv_data_size = sizeof(EightSvxContext),
241 .init = eightsvx_decode_init,
242 .close = eightsvx_decode_close,
243 .decode = eightsvx_decode_frame,
0eea2129 244 .capabilities = CODEC_CAP_DELAY | CODEC_CAP_DR1,
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245 .long_name = NULL_IF_CONFIG_SMALL("PCM signed 8-bit planar"),
246};