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Rev | Author | Line No. | Line |
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4349 | Serge | 1 | /* |
2 | * Nellymoser encoder |
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3 | * This code is developed as part of Google Summer of Code 2008 Program. |
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4 | * |
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5 | * Copyright (c) 2008 Bartlomiej Wolowiec |
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6 | * |
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7 | * This file is part of FFmpeg. |
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8 | * |
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9 | * FFmpeg is free software; you can redistribute it and/or |
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10 | * modify it under the terms of the GNU Lesser General Public |
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11 | * License as published by the Free Software Foundation; either |
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12 | * version 2.1 of the License, or (at your option) any later version. |
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13 | * |
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14 | * FFmpeg is distributed in the hope that it will be useful, |
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15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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17 | * Lesser General Public License for more details. |
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18 | * |
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19 | * You should have received a copy of the GNU Lesser General Public |
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20 | * License along with FFmpeg; if not, write to the Free Software |
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21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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22 | */ |
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23 | |||
24 | /** |
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25 | * @file |
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26 | * Nellymoser encoder |
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27 | * by Bartlomiej Wolowiec |
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28 | * |
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29 | * Generic codec information: libavcodec/nellymoserdec.c |
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30 | * |
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31 | * Some information also from: http://samples.mplayerhq.hu/A-codecs/Nelly_Moser/ASAO/ASAO.zip |
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32 | * (Copyright Joseph Artsimovich and UAB "DKD") |
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33 | * |
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34 | * for more information about nellymoser format, visit: |
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35 | * http://wiki.multimedia.cx/index.php?title=Nellymoser |
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36 | */ |
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37 | |||
38 | #include "libavutil/float_dsp.h" |
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39 | #include "libavutil/mathematics.h" |
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40 | #include "nellymoser.h" |
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41 | #include "avcodec.h" |
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42 | #include "audio_frame_queue.h" |
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43 | #include "fft.h" |
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44 | #include "internal.h" |
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45 | #include "sinewin.h" |
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46 | |||
47 | #define BITSTREAM_WRITER_LE |
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48 | #include "put_bits.h" |
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49 | |||
50 | #define POW_TABLE_SIZE (1<<11) |
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51 | #define POW_TABLE_OFFSET 3 |
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52 | #define OPT_SIZE ((1<<15) + 3000) |
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53 | |||
54 | typedef struct NellyMoserEncodeContext { |
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55 | AVCodecContext *avctx; |
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56 | int last_frame; |
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57 | AVFloatDSPContext fdsp; |
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58 | FFTContext mdct_ctx; |
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59 | AudioFrameQueue afq; |
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60 | DECLARE_ALIGNED(32, float, mdct_out)[NELLY_SAMPLES]; |
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61 | DECLARE_ALIGNED(32, float, in_buff)[NELLY_SAMPLES]; |
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62 | DECLARE_ALIGNED(32, float, buf)[3 * NELLY_BUF_LEN]; ///< sample buffer |
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63 | float (*opt )[OPT_SIZE]; |
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64 | uint8_t (*path)[OPT_SIZE]; |
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65 | } NellyMoserEncodeContext; |
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66 | |||
67 | static float pow_table[POW_TABLE_SIZE]; ///< -pow(2, -i / 2048.0 - 3.0); |
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68 | |||
69 | static const uint8_t sf_lut[96] = { |
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70 | 0, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 4, 4, |
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71 | 5, 5, 5, 6, 7, 7, 8, 8, 9, 10, 11, 11, 12, 13, 13, 14, |
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72 | 15, 15, 16, 17, 17, 18, 19, 19, 20, 21, 22, 22, 23, 24, 25, 26, |
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73 | 27, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 37, 38, 39, 40, |
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74 | 41, 41, 42, 43, 44, 45, 45, 46, 47, 48, 49, 50, 51, 52, 52, 53, |
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75 | 54, 55, 55, 56, 57, 57, 58, 59, 59, 60, 60, 60, 61, 61, 61, 62, |
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76 | }; |
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77 | |||
78 | static const uint8_t sf_delta_lut[78] = { |
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79 | 0, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 4, 4, |
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80 | 4, 5, 5, 5, 6, 6, 7, 7, 8, 8, 9, 10, 10, 11, 11, 12, |
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81 | 13, 13, 14, 15, 16, 17, 17, 18, 19, 19, 20, 21, 21, 22, 22, 23, |
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82 | 23, 24, 24, 25, 25, 25, 26, 26, 26, 26, 27, 27, 27, 27, 27, 28, |
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83 | 28, 28, 28, 28, 28, 29, 29, 29, 29, 29, 29, 29, 29, 30, |
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84 | }; |
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85 | |||
86 | static const uint8_t quant_lut[230] = { |
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87 | 0, |
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88 | |||
89 | 0, 1, 2, |
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90 | |||
91 | 0, 1, 2, 3, 4, 5, 6, |
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92 | |||
93 | 0, 1, 1, 2, 2, 3, 3, 4, 5, 6, 7, 8, 9, 10, 11, 11, |
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94 | 12, 13, 13, 13, 14, |
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95 | |||
96 | 0, 1, 1, 2, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 8, |
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97 | 8, 9, 10, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, |
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98 | 22, 23, 23, 24, 24, 25, 25, 26, 26, 27, 27, 28, 28, 29, 29, 29, |
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99 | 30, |
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100 | |||
101 | 0, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 3, 3, 3, 3, |
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102 | 4, 4, 4, 5, 5, 5, 6, 6, 7, 7, 7, 8, 8, 9, 9, 9, |
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103 | 10, 10, 11, 11, 11, 12, 12, 13, 13, 13, 13, 14, 14, 14, 15, 15, |
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104 | 15, 15, 16, 16, 16, 17, 17, 17, 18, 18, 18, 19, 19, 20, 20, 20, |
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105 | 21, 21, 22, 22, 23, 23, 24, 25, 26, 26, 27, 28, 29, 30, 31, 32, |
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106 | 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 42, 43, 44, 44, 45, 45, |
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107 | 46, 47, 47, 48, 48, 49, 49, 50, 50, 50, 51, 51, 51, 52, 52, 52, |
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108 | 53, 53, 53, 54, 54, 54, 55, 55, 55, 56, 56, 56, 57, 57, 57, 57, |
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109 | 58, 58, 58, 58, 59, 59, 59, 59, 60, 60, 60, 60, 60, 61, 61, 61, |
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110 | 61, 61, 61, 61, 62, |
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111 | }; |
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112 | |||
113 | static const float quant_lut_mul[7] = { 0.0, 0.0, 2.0, 2.0, 5.0, 12.0, 36.6 }; |
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114 | static const float quant_lut_add[7] = { 0.0, 0.0, 2.0, 7.0, 21.0, 56.0, 157.0 }; |
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115 | static const uint8_t quant_lut_offset[8] = { 0, 0, 1, 4, 11, 32, 81, 230 }; |
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116 | |||
117 | static void apply_mdct(NellyMoserEncodeContext *s) |
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118 | { |
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119 | float *in0 = s->buf; |
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120 | float *in1 = s->buf + NELLY_BUF_LEN; |
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121 | float *in2 = s->buf + 2 * NELLY_BUF_LEN; |
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122 | |||
123 | s->fdsp.vector_fmul (s->in_buff, in0, ff_sine_128, NELLY_BUF_LEN); |
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124 | s->fdsp.vector_fmul_reverse(s->in_buff + NELLY_BUF_LEN, in1, ff_sine_128, NELLY_BUF_LEN); |
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125 | s->mdct_ctx.mdct_calc(&s->mdct_ctx, s->mdct_out, s->in_buff); |
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126 | |||
127 | s->fdsp.vector_fmul (s->in_buff, in1, ff_sine_128, NELLY_BUF_LEN); |
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128 | s->fdsp.vector_fmul_reverse(s->in_buff + NELLY_BUF_LEN, in2, ff_sine_128, NELLY_BUF_LEN); |
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129 | s->mdct_ctx.mdct_calc(&s->mdct_ctx, s->mdct_out + NELLY_BUF_LEN, s->in_buff); |
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130 | } |
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131 | |||
132 | static av_cold int encode_end(AVCodecContext *avctx) |
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133 | { |
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134 | NellyMoserEncodeContext *s = avctx->priv_data; |
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135 | |||
136 | ff_mdct_end(&s->mdct_ctx); |
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137 | |||
138 | if (s->avctx->trellis) { |
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139 | av_free(s->opt); |
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140 | av_free(s->path); |
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141 | } |
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142 | ff_af_queue_close(&s->afq); |
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143 | |||
144 | return 0; |
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145 | } |
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146 | |||
147 | static av_cold int encode_init(AVCodecContext *avctx) |
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148 | { |
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149 | NellyMoserEncodeContext *s = avctx->priv_data; |
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150 | int i, ret; |
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151 | |||
152 | if (avctx->channels != 1) { |
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153 | av_log(avctx, AV_LOG_ERROR, "Nellymoser supports only 1 channel\n"); |
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154 | return AVERROR(EINVAL); |
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155 | } |
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156 | |||
157 | if (avctx->sample_rate != 8000 && avctx->sample_rate != 16000 && |
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158 | avctx->sample_rate != 11025 && |
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159 | avctx->sample_rate != 22050 && avctx->sample_rate != 44100 && |
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160 | avctx->strict_std_compliance >= FF_COMPLIANCE_NORMAL) { |
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161 | av_log(avctx, AV_LOG_ERROR, "Nellymoser works only with 8000, 16000, 11025, 22050 and 44100 sample rate\n"); |
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162 | return AVERROR(EINVAL); |
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163 | } |
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164 | |||
165 | avctx->frame_size = NELLY_SAMPLES; |
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166 | avctx->delay = NELLY_BUF_LEN; |
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167 | ff_af_queue_init(avctx, &s->afq); |
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168 | s->avctx = avctx; |
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169 | if ((ret = ff_mdct_init(&s->mdct_ctx, 8, 0, 32768.0)) < 0) |
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170 | goto error; |
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171 | avpriv_float_dsp_init(&s->fdsp, avctx->flags & CODEC_FLAG_BITEXACT); |
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172 | |||
173 | /* Generate overlap window */ |
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174 | ff_init_ff_sine_windows(7); |
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175 | for (i = 0; i < POW_TABLE_SIZE; i++) |
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176 | pow_table[i] = -pow(2, -i / 2048.0 - 3.0 + POW_TABLE_OFFSET); |
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177 | |||
178 | if (s->avctx->trellis) { |
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179 | s->opt = av_malloc(NELLY_BANDS * OPT_SIZE * sizeof(float )); |
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180 | s->path = av_malloc(NELLY_BANDS * OPT_SIZE * sizeof(uint8_t)); |
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181 | if (!s->opt || !s->path) { |
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182 | ret = AVERROR(ENOMEM); |
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183 | goto error; |
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184 | } |
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185 | } |
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186 | |||
187 | return 0; |
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188 | error: |
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189 | encode_end(avctx); |
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190 | return ret; |
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191 | } |
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192 | |||
193 | #define find_best(val, table, LUT, LUT_add, LUT_size) \ |
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194 | best_idx = \ |
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195 | LUT[av_clip ((lrintf(val) >> 8) + LUT_add, 0, LUT_size - 1)]; \ |
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196 | if (fabs(val - table[best_idx]) > fabs(val - table[best_idx + 1])) \ |
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197 | best_idx++; |
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198 | |||
199 | static void get_exponent_greedy(NellyMoserEncodeContext *s, float *cand, int *idx_table) |
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200 | { |
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201 | int band, best_idx, power_idx = 0; |
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202 | float power_candidate; |
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203 | |||
204 | //base exponent |
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205 | find_best(cand[0], ff_nelly_init_table, sf_lut, -20, 96); |
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206 | idx_table[0] = best_idx; |
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207 | power_idx = ff_nelly_init_table[best_idx]; |
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208 | |||
209 | for (band = 1; band < NELLY_BANDS; band++) { |
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210 | power_candidate = cand[band] - power_idx; |
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211 | find_best(power_candidate, ff_nelly_delta_table, sf_delta_lut, 37, 78); |
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212 | idx_table[band] = best_idx; |
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213 | power_idx += ff_nelly_delta_table[best_idx]; |
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214 | } |
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215 | } |
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216 | |||
217 | static inline float distance(float x, float y, int band) |
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218 | { |
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219 | //return pow(fabs(x-y), 2.0); |
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220 | float tmp = x - y; |
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221 | return tmp * tmp; |
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222 | } |
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223 | |||
224 | static void get_exponent_dynamic(NellyMoserEncodeContext *s, float *cand, int *idx_table) |
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225 | { |
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226 | int i, j, band, best_idx; |
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227 | float power_candidate, best_val; |
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228 | |||
229 | float (*opt )[OPT_SIZE] = s->opt ; |
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230 | uint8_t(*path)[OPT_SIZE] = s->path; |
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231 | |||
232 | for (i = 0; i < NELLY_BANDS * OPT_SIZE; i++) { |
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233 | opt[0][i] = INFINITY; |
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234 | } |
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235 | |||
236 | for (i = 0; i < 64; i++) { |
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237 | opt[0][ff_nelly_init_table[i]] = distance(cand[0], ff_nelly_init_table[i], 0); |
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238 | path[0][ff_nelly_init_table[i]] = i; |
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239 | } |
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240 | |||
241 | for (band = 1; band < NELLY_BANDS; band++) { |
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242 | int q, c = 0; |
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243 | float tmp; |
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244 | int idx_min, idx_max, idx; |
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245 | power_candidate = cand[band]; |
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246 | for (q = 1000; !c && q < OPT_SIZE; q <<= 2) { |
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247 | idx_min = FFMAX(0, cand[band] - q); |
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248 | idx_max = FFMIN(OPT_SIZE, cand[band - 1] + q); |
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249 | for (i = FFMAX(0, cand[band - 1] - q); i < FFMIN(OPT_SIZE, cand[band - 1] + q); i++) { |
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250 | if ( isinf(opt[band - 1][i]) ) |
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251 | continue; |
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252 | for (j = 0; j < 32; j++) { |
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253 | idx = i + ff_nelly_delta_table[j]; |
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254 | if (idx > idx_max) |
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255 | break; |
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256 | if (idx >= idx_min) { |
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257 | tmp = opt[band - 1][i] + distance(idx, power_candidate, band); |
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258 | if (opt[band][idx] > tmp) { |
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259 | opt[band][idx] = tmp; |
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260 | path[band][idx] = j; |
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261 | c = 1; |
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262 | } |
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263 | } |
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264 | } |
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265 | } |
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266 | } |
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267 | assert(c); //FIXME |
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268 | } |
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269 | |||
270 | best_val = INFINITY; |
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271 | best_idx = -1; |
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272 | band = NELLY_BANDS - 1; |
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273 | for (i = 0; i < OPT_SIZE; i++) { |
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274 | if (best_val > opt[band][i]) { |
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275 | best_val = opt[band][i]; |
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276 | best_idx = i; |
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277 | } |
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278 | } |
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279 | for (band = NELLY_BANDS - 1; band >= 0; band--) { |
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280 | idx_table[band] = path[band][best_idx]; |
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281 | if (band) { |
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282 | best_idx -= ff_nelly_delta_table[path[band][best_idx]]; |
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283 | } |
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284 | } |
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285 | } |
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286 | |||
287 | /** |
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288 | * Encode NELLY_SAMPLES samples. It assumes, that samples contains 3 * NELLY_BUF_LEN values |
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289 | * @param s encoder context |
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290 | * @param output output buffer |
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291 | * @param output_size size of output buffer |
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292 | */ |
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293 | static void encode_block(NellyMoserEncodeContext *s, unsigned char *output, int output_size) |
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294 | { |
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295 | PutBitContext pb; |
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296 | int i, j, band, block, best_idx, power_idx = 0; |
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297 | float power_val, coeff, coeff_sum; |
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298 | float pows[NELLY_FILL_LEN]; |
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299 | int bits[NELLY_BUF_LEN], idx_table[NELLY_BANDS]; |
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300 | float cand[NELLY_BANDS]; |
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301 | |||
302 | apply_mdct(s); |
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303 | |||
304 | init_put_bits(&pb, output, output_size * 8); |
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305 | |||
306 | i = 0; |
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307 | for (band = 0; band < NELLY_BANDS; band++) { |
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308 | coeff_sum = 0; |
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309 | for (j = 0; j < ff_nelly_band_sizes_table[band]; i++, j++) { |
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310 | coeff_sum += s->mdct_out[i ] * s->mdct_out[i ] |
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311 | + s->mdct_out[i + NELLY_BUF_LEN] * s->mdct_out[i + NELLY_BUF_LEN]; |
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312 | } |
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313 | cand[band] = |
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314 | log(FFMAX(1.0, coeff_sum / (ff_nelly_band_sizes_table[band] << 7))) * 1024.0 / M_LN2; |
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315 | } |
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316 | |||
317 | if (s->avctx->trellis) { |
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318 | get_exponent_dynamic(s, cand, idx_table); |
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319 | } else { |
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320 | get_exponent_greedy(s, cand, idx_table); |
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321 | } |
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322 | |||
323 | i = 0; |
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324 | for (band = 0; band < NELLY_BANDS; band++) { |
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325 | if (band) { |
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326 | power_idx += ff_nelly_delta_table[idx_table[band]]; |
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327 | put_bits(&pb, 5, idx_table[band]); |
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328 | } else { |
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329 | power_idx = ff_nelly_init_table[idx_table[0]]; |
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330 | put_bits(&pb, 6, idx_table[0]); |
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331 | } |
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332 | power_val = pow_table[power_idx & 0x7FF] / (1 << ((power_idx >> 11) + POW_TABLE_OFFSET)); |
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333 | for (j = 0; j < ff_nelly_band_sizes_table[band]; i++, j++) { |
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334 | s->mdct_out[i] *= power_val; |
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335 | s->mdct_out[i + NELLY_BUF_LEN] *= power_val; |
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336 | pows[i] = power_idx; |
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337 | } |
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338 | } |
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339 | |||
340 | ff_nelly_get_sample_bits(pows, bits); |
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341 | |||
342 | for (block = 0; block < 2; block++) { |
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343 | for (i = 0; i < NELLY_FILL_LEN; i++) { |
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344 | if (bits[i] > 0) { |
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345 | const float *table = ff_nelly_dequantization_table + (1 << bits[i]) - 1; |
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346 | coeff = s->mdct_out[block * NELLY_BUF_LEN + i]; |
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347 | best_idx = |
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348 | quant_lut[av_clip ( |
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349 | coeff * quant_lut_mul[bits[i]] + quant_lut_add[bits[i]], |
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350 | quant_lut_offset[bits[i]], |
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351 | quant_lut_offset[bits[i]+1] - 1 |
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352 | )]; |
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353 | if (fabs(coeff - table[best_idx]) > fabs(coeff - table[best_idx + 1])) |
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354 | best_idx++; |
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355 | |||
356 | put_bits(&pb, bits[i], best_idx); |
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357 | } |
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358 | } |
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359 | if (!block) |
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360 | put_bits(&pb, NELLY_HEADER_BITS + NELLY_DETAIL_BITS - put_bits_count(&pb), 0); |
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361 | } |
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362 | |||
363 | flush_put_bits(&pb); |
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364 | memset(put_bits_ptr(&pb), 0, output + output_size - put_bits_ptr(&pb)); |
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365 | } |
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366 | |||
367 | static int encode_frame(AVCodecContext *avctx, AVPacket *avpkt, |
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368 | const AVFrame *frame, int *got_packet_ptr) |
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369 | { |
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370 | NellyMoserEncodeContext *s = avctx->priv_data; |
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371 | int ret; |
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372 | |||
373 | if (s->last_frame) |
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374 | return 0; |
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375 | |||
376 | memcpy(s->buf, s->buf + NELLY_SAMPLES, NELLY_BUF_LEN * sizeof(*s->buf)); |
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377 | if (frame) { |
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378 | memcpy(s->buf + NELLY_BUF_LEN, frame->data[0], |
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379 | frame->nb_samples * sizeof(*s->buf)); |
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380 | if (frame->nb_samples < NELLY_SAMPLES) { |
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381 | memset(s->buf + NELLY_BUF_LEN + frame->nb_samples, 0, |
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382 | (NELLY_SAMPLES - frame->nb_samples) * sizeof(*s->buf)); |
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383 | if (frame->nb_samples >= NELLY_BUF_LEN) |
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384 | s->last_frame = 1; |
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385 | } |
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386 | if ((ret = ff_af_queue_add(&s->afq, frame)) < 0) |
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387 | return ret; |
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388 | } else { |
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389 | memset(s->buf + NELLY_BUF_LEN, 0, NELLY_SAMPLES * sizeof(*s->buf)); |
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390 | s->last_frame = 1; |
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391 | } |
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392 | |||
393 | if ((ret = ff_alloc_packet2(avctx, avpkt, NELLY_BLOCK_LEN)) < 0) |
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394 | return ret; |
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395 | encode_block(s, avpkt->data, avpkt->size); |
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396 | |||
397 | /* Get the next frame pts/duration */ |
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398 | ff_af_queue_remove(&s->afq, avctx->frame_size, &avpkt->pts, |
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399 | &avpkt->duration); |
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400 | |||
401 | *got_packet_ptr = 1; |
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402 | return 0; |
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403 | } |
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404 | |||
405 | AVCodec ff_nellymoser_encoder = { |
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406 | .name = "nellymoser", |
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407 | .long_name = NULL_IF_CONFIG_SMALL("Nellymoser Asao"), |
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408 | .type = AVMEDIA_TYPE_AUDIO, |
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409 | .id = AV_CODEC_ID_NELLYMOSER, |
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410 | .priv_data_size = sizeof(NellyMoserEncodeContext), |
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411 | .init = encode_init, |
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412 | .encode2 = encode_frame, |
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413 | .close = encode_end, |
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414 | .capabilities = CODEC_CAP_SMALL_LAST_FRAME | CODEC_CAP_DELAY, |
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415 | .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLT, |
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416 | AV_SAMPLE_FMT_NONE }, |
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417 | };>>>><>>>>><>>><>>>>>>=><=>>>>>>>>>>15)><15)>11) |