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4349 | Serge | 1 | /* |
2 | * Copyright (C) 2008 Jaikrishnan Menon |
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3 | * Copyright (C) 2011 Stefano Sabatini |
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4 | * |
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5 | * This file is part of FFmpeg. |
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6 | * |
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7 | * FFmpeg 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 |
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9 | * License as published by the Free Software Foundation; either |
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10 | * version 2.1 of the License, or (at your option) any later version. |
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11 | * |
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12 | * FFmpeg 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 |
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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15 | * Lesser General Public License for more details. |
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16 | * |
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17 | * You should have received a copy of the GNU Lesser General Public |
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18 | * License along with FFmpeg; if not, write to the Free Software |
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19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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20 | */ |
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21 | |||
22 | /** |
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23 | * @file |
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24 | * 8svx audio decoder |
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25 | * @author Jaikrishnan Menon |
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26 | * |
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27 | * supports: fibonacci delta encoding |
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28 | * : exponential encoding |
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29 | * |
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30 | * For more information about the 8SVX format: |
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31 | * http://netghost.narod.ru/gff/vendspec/iff/iff.txt |
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32 | * http://sox.sourceforge.net/AudioFormats-11.html |
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33 | * http://aminet.net/package/mus/misc/wavepak |
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34 | * http://amigan.1emu.net/reg/8SVX.txt |
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35 | * |
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36 | * Samples can be found here: |
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37 | * http://aminet.net/mods/smpl/ |
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38 | */ |
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39 | |||
40 | #include "libavutil/avassert.h" |
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41 | #include "avcodec.h" |
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42 | #include "internal.h" |
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43 | #include "libavutil/common.h" |
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44 | |||
45 | /** decoder context */ |
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46 | typedef struct EightSvxContext { |
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47 | uint8_t fib_acc[2]; |
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48 | const int8_t *table; |
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49 | |||
50 | /* buffer used to store the whole first packet. |
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51 | data is only sent as one large packet */ |
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52 | uint8_t *data[2]; |
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53 | int data_size; |
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54 | int data_idx; |
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55 | } EightSvxContext; |
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56 | |||
57 | static const int8_t fibonacci[16] = { -34, -21, -13, -8, -5, -3, -2, -1, 0, 1, 2, 3, 5, 8, 13, 21 }; |
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58 | static const int8_t exponential[16] = { -128, -64, -32, -16, -8, -4, -2, -1, 0, 1, 2, 4, 8, 16, 32, 64 }; |
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59 | |||
60 | #define MAX_FRAME_SIZE 2048 |
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61 | |||
62 | /** |
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63 | * Delta decode the compressed values in src, and put the resulting |
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64 | * decoded samples in dst. |
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65 | * |
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66 | * @param[in,out] state starting value. it is saved for use in the next call. |
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67 | * @param table delta sequence table |
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68 | */ |
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69 | static void delta_decode(uint8_t *dst, const uint8_t *src, int src_size, |
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70 | uint8_t *state, const int8_t *table) |
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71 | { |
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72 | uint8_t val = *state; |
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73 | |||
74 | while (src_size--) { |
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75 | uint8_t d = *src++; |
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76 | val = av_clip_uint8(val + table[d & 0xF]); |
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77 | *dst++ = val; |
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78 | val = av_clip_uint8(val + table[d >> 4]); |
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79 | *dst++ = val; |
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80 | } |
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81 | |||
82 | *state = val; |
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83 | } |
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84 | |||
85 | /** decode a frame */ |
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86 | static int eightsvx_decode_frame(AVCodecContext *avctx, void *data, |
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87 | int *got_frame_ptr, AVPacket *avpkt) |
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88 | { |
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89 | EightSvxContext *esc = avctx->priv_data; |
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90 | AVFrame *frame = data; |
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91 | int buf_size; |
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92 | int ch, ret; |
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93 | int hdr_size = 2; |
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94 | |||
95 | /* decode and interleave the first packet */ |
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96 | if (!esc->data[0] && avpkt) { |
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97 | int chan_size = avpkt->size / avctx->channels - hdr_size; |
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98 | |||
99 | if (avpkt->size % avctx->channels) { |
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100 | av_log(avctx, AV_LOG_WARNING, "Packet with odd size, ignoring last byte\n"); |
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101 | } |
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102 | if (avpkt->size < (hdr_size + 1) * avctx->channels) { |
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103 | av_log(avctx, AV_LOG_ERROR, "packet size is too small\n"); |
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104 | return AVERROR(EINVAL); |
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105 | } |
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106 | |||
107 | esc->fib_acc[0] = avpkt->data[1] + 128; |
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108 | if (avctx->channels == 2) |
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109 | esc->fib_acc[1] = avpkt->data[2+chan_size+1] + 128; |
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110 | |||
111 | esc->data_idx = 0; |
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112 | esc->data_size = chan_size; |
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113 | if (!(esc->data[0] = av_malloc(chan_size))) |
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114 | return AVERROR(ENOMEM); |
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115 | if (avctx->channels == 2) { |
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116 | if (!(esc->data[1] = av_malloc(chan_size))) { |
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117 | av_freep(&esc->data[0]); |
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118 | return AVERROR(ENOMEM); |
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119 | } |
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120 | } |
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121 | memcpy(esc->data[0], &avpkt->data[hdr_size], chan_size); |
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122 | if (avctx->channels == 2) |
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123 | memcpy(esc->data[1], &avpkt->data[2*hdr_size+chan_size], chan_size); |
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124 | } |
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125 | if (!esc->data[0]) { |
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126 | av_log(avctx, AV_LOG_ERROR, "unexpected empty packet\n"); |
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127 | return AVERROR(EINVAL); |
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128 | } |
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129 | |||
130 | /* decode next piece of data from the buffer */ |
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131 | buf_size = FFMIN(MAX_FRAME_SIZE, esc->data_size - esc->data_idx); |
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132 | if (buf_size <= 0) { |
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133 | *got_frame_ptr = 0; |
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134 | return avpkt->size; |
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135 | } |
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136 | |||
137 | /* get output buffer */ |
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138 | frame->nb_samples = buf_size * 2; |
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139 | if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
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140 | return ret; |
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141 | |||
142 | for (ch = 0; ch < avctx->channels; ch++) { |
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143 | delta_decode(frame->data[ch], &esc->data[ch][esc->data_idx], |
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144 | buf_size, &esc->fib_acc[ch], esc->table); |
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145 | } |
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146 | |||
147 | esc->data_idx += buf_size; |
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148 | |||
149 | *got_frame_ptr = 1; |
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150 | |||
151 | return ((avctx->frame_number == 0)*hdr_size + buf_size)*avctx->channels; |
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152 | } |
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153 | |||
154 | static av_cold int eightsvx_decode_init(AVCodecContext *avctx) |
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155 | { |
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156 | EightSvxContext *esc = avctx->priv_data; |
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157 | |||
158 | if (avctx->channels < 1 || avctx->channels > 2) { |
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159 | av_log(avctx, AV_LOG_ERROR, "8SVX does not support more than 2 channels\n"); |
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160 | return AVERROR_INVALIDDATA; |
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161 | } |
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162 | |||
163 | switch (avctx->codec->id) { |
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164 | case AV_CODEC_ID_8SVX_FIB: esc->table = fibonacci; break; |
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165 | case AV_CODEC_ID_8SVX_EXP: esc->table = exponential; break; |
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166 | default: |
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167 | av_log(avctx, AV_LOG_ERROR, "Invalid codec id %d.\n", avctx->codec->id); |
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168 | return AVERROR_INVALIDDATA; |
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169 | } |
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170 | avctx->sample_fmt = AV_SAMPLE_FMT_U8P; |
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171 | |||
172 | return 0; |
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173 | } |
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174 | |||
175 | static av_cold int eightsvx_decode_close(AVCodecContext *avctx) |
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176 | { |
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177 | EightSvxContext *esc = avctx->priv_data; |
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178 | |||
179 | av_freep(&esc->data[0]); |
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180 | av_freep(&esc->data[1]); |
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181 | esc->data_size = 0; |
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182 | esc->data_idx = 0; |
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183 | |||
184 | return 0; |
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185 | } |
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186 | |||
187 | #if CONFIG_EIGHTSVX_FIB_DECODER |
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188 | AVCodec ff_eightsvx_fib_decoder = { |
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189 | .name = "8svx_fib", |
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190 | .long_name = NULL_IF_CONFIG_SMALL("8SVX fibonacci"), |
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191 | .type = AVMEDIA_TYPE_AUDIO, |
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192 | .id = AV_CODEC_ID_8SVX_FIB, |
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193 | .priv_data_size = sizeof (EightSvxContext), |
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194 | .init = eightsvx_decode_init, |
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195 | .decode = eightsvx_decode_frame, |
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196 | .close = eightsvx_decode_close, |
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197 | .capabilities = CODEC_CAP_DR1, |
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198 | .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_U8P, |
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199 | AV_SAMPLE_FMT_NONE }, |
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200 | }; |
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201 | #endif |
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202 | #if CONFIG_EIGHTSVX_EXP_DECODER |
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203 | AVCodec ff_eightsvx_exp_decoder = { |
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204 | .name = "8svx_exp", |
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205 | .long_name = NULL_IF_CONFIG_SMALL("8SVX exponential"), |
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206 | .type = AVMEDIA_TYPE_AUDIO, |
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207 | .id = AV_CODEC_ID_8SVX_EXP, |
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208 | .priv_data_size = sizeof (EightSvxContext), |
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209 | .init = eightsvx_decode_init, |
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210 | .decode = eightsvx_decode_frame, |
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211 | .close = eightsvx_decode_close, |
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212 | .capabilities = CODEC_CAP_DR1, |
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213 | .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_U8P, |
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214 | AV_SAMPLE_FMT_NONE }, |
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215 | }; |
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216 | #endif>>>=>> |