ra144enc: add sample_fmts list to ff_ra_144_encoder
[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 {
1993c684 35 uint8_t fib_acc[2];
e3718784 36 const int8_t *table;
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37
38 /* buffer used to store the whole first packet.
39 data is only sent as one large packet */
40 uint8_t *data[2];
41 int data_size;
42 int data_idx;
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43} EightSvxContext;
44
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45static const int8_t fibonacci[16] = { -34, -21, -13, -8, -5, -3, -2, -1,
46 0, 1, 2, 3, 5, 8, 13, 21 };
47static const int8_t exponential[16] = { -128, -64, -32, -16, -8, -4, -2, -1,
48 0, 1, 2, 4, 8, 16, 32, 64 };
cb21e0a7 49
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50#define MAX_FRAME_SIZE 32768
51
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52/**
53 * Delta decode the compressed values in src, and put the resulting
54 * decoded samples in dst.
55 *
56 * @param[in,out] state starting value. it is saved for use in the next call.
57 */
e3718784 58static void delta_decode(uint8_t *dst, const uint8_t *src, int src_size,
1993c684 59 uint8_t *state, const int8_t *table, int channels)
ac68607b 60{
e3718784 61 uint8_t val = *state;
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62
63 while (src_size--) {
64 uint8_t d = *src++;
e3718784 65 val = av_clip_uint8(val + table[d & 0xF]);
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66 *dst = val;
67 dst += channels;
e3718784 68 val = av_clip_uint8(val + table[d >> 4]);
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69 *dst = val;
70 dst += channels;
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71 }
72
73 *state = val;
74}
75
1b41f260 76/** decode a frame */
cb21e0a7 77static int eightsvx_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
7a00bbad 78 AVPacket *avpkt)
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79{
80 EightSvxContext *esc = avctx->priv_data;
1993c684 81 int buf_size;
e3718784 82 uint8_t *out_data = data;
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83 int out_data_size;
84
85 /* for the first packet, copy data to buffer */
86 if (avpkt->data) {
87 int chan_size = (avpkt->size / avctx->channels) - 2;
cb21e0a7 88
1993c684 89 if (avpkt->size < 2) {
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90 av_log(avctx, AV_LOG_ERROR, "packet size is too small\n");
91 return AVERROR(EINVAL);
92 }
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93 if (esc->data[0]) {
94 av_log(avctx, AV_LOG_ERROR, "unexpected data after first packet\n");
95 return AVERROR(EINVAL);
96 }
97
98 esc->fib_acc[0] = avpkt->data[1] + 128;
99 if (avctx->channels == 2)
100 esc->fib_acc[1] = avpkt->data[2+chan_size+1] + 128;
101
102 esc->data_idx = 0;
103 esc->data_size = chan_size;
104 if (!(esc->data[0] = av_malloc(chan_size)))
105 return AVERROR(ENOMEM);
106 if (avctx->channels == 2) {
107 if (!(esc->data[1] = av_malloc(chan_size))) {
108 av_freep(&esc->data[0]);
109 return AVERROR(ENOMEM);
110 }
111 }
112 memcpy(esc->data[0], &avpkt->data[2], chan_size);
113 if (avctx->channels == 2)
114 memcpy(esc->data[1], &avpkt->data[2+chan_size+2], chan_size);
115 }
116 if (!esc->data[0]) {
117 av_log(avctx, AV_LOG_ERROR, "unexpected empty packet\n");
118 return AVERROR(EINVAL);
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119 }
120
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121 /* decode next piece of data from the buffer */
122 buf_size = FFMIN(MAX_FRAME_SIZE, esc->data_size - esc->data_idx);
123 if (buf_size <= 0) {
124 *data_size = 0;
125 return avpkt->size;
126 }
127 out_data_size = buf_size * 2 * avctx->channels;
128 if (*data_size < out_data_size) {
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129 av_log(avctx, AV_LOG_ERROR, "Provided buffer with size %d is too small.\n",
130 *data_size);
e3718784 131 return AVERROR(EINVAL);
fda459ce 132 }
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133 delta_decode(out_data, &esc->data[0][esc->data_idx], buf_size,
134 &esc->fib_acc[0], esc->table, avctx->channels);
135 if (avctx->channels == 2) {
136 delta_decode(&out_data[1], &esc->data[1][esc->data_idx], buf_size,
137 &esc->fib_acc[1], esc->table, avctx->channels);
138 }
139 esc->data_idx += buf_size;
140 *data_size = out_data_size;
cb21e0a7 141
1993c684 142 return avpkt->size;
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143}
144
1b41f260 145/** initialize 8svx decoder */
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146static av_cold int eightsvx_decode_init(AVCodecContext *avctx)
147{
148 EightSvxContext *esc = avctx->priv_data;
149
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150 if (avctx->channels < 1 || avctx->channels > 2) {
151 av_log(avctx, AV_LOG_ERROR, "8SVX does not support more than 2 channels\n");
152 return AVERROR(EINVAL);
153 }
154
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155 switch(avctx->codec->id) {
156 case CODEC_ID_8SVX_FIB:
157 esc->table = fibonacci;
158 break;
159 case CODEC_ID_8SVX_EXP:
160 esc->table = exponential;
161 break;
162 default:
163 return -1;
164 }
e3718784 165 avctx->sample_fmt = AV_SAMPLE_FMT_U8;
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166 return 0;
167}
168
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169static av_cold int eightsvx_decode_close(AVCodecContext *avctx)
170{
171 EightSvxContext *esc = avctx->priv_data;
172
173 av_freep(&esc->data[0]);
174 av_freep(&esc->data[1]);
175
176 return 0;
177}
178
d36beb3f 179AVCodec ff_eightsvx_fib_decoder = {
99e3913d 180 .name = "8svx_fib",
72415b2a 181 .type = AVMEDIA_TYPE_AUDIO,
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182 .id = CODEC_ID_8SVX_FIB,
183 .priv_data_size = sizeof (EightSvxContext),
184 .init = eightsvx_decode_init,
1993c684 185 .close = eightsvx_decode_close,
cb21e0a7 186 .decode = eightsvx_decode_frame,
1993c684 187 .capabilities = CODEC_CAP_DELAY,
fe4bf374 188 .long_name = NULL_IF_CONFIG_SMALL("8SVX fibonacci"),
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189};
190
d36beb3f 191AVCodec ff_eightsvx_exp_decoder = {
99e3913d 192 .name = "8svx_exp",
72415b2a 193 .type = AVMEDIA_TYPE_AUDIO,
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194 .id = CODEC_ID_8SVX_EXP,
195 .priv_data_size = sizeof (EightSvxContext),
196 .init = eightsvx_decode_init,
1993c684 197 .close = eightsvx_decode_close,
cb21e0a7 198 .decode = eightsvx_decode_frame,
1993c684 199 .capabilities = CODEC_CAP_DELAY,
fe4bf374 200 .long_name = NULL_IF_CONFIG_SMALL("8SVX exponential"),
cb21e0a7 201};