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Rev | Author | Line No. | Line |
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4349 | Serge | 1 | /* |
2 | * Real Audio 1.0 (14.4K) |
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3 | * |
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4 | * Copyright (c) 2008 Vitor Sessak |
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5 | * Copyright (c) 2003 Nick Kurshev |
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6 | * Based on public domain decoder at http://www.honeypot.net/audio |
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7 | * |
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8 | * This file is part of FFmpeg. |
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9 | * |
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10 | * FFmpeg is free software; you can redistribute it and/or |
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11 | * modify it under the terms of the GNU Lesser General Public |
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12 | * License as published by the Free Software Foundation; either |
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13 | * version 2.1 of the License, or (at your option) any later version. |
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14 | * |
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15 | * FFmpeg is distributed in the hope that it will be useful, |
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16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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18 | * Lesser General Public License for more details. |
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19 | * |
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20 | * You should have received a copy of the GNU Lesser General Public |
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21 | * License along with FFmpeg; if not, write to the Free Software |
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22 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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23 | */ |
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24 | |||
25 | #include "libavutil/channel_layout.h" |
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26 | #include "avcodec.h" |
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27 | #include "get_bits.h" |
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28 | #include "internal.h" |
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29 | #include "ra144.h" |
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30 | |||
31 | |||
32 | static av_cold int ra144_decode_init(AVCodecContext * avctx) |
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33 | { |
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34 | RA144Context *ractx = avctx->priv_data; |
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35 | |||
36 | ractx->avctx = avctx; |
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37 | |||
38 | ractx->lpc_coef[0] = ractx->lpc_tables[0]; |
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39 | ractx->lpc_coef[1] = ractx->lpc_tables[1]; |
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40 | |||
41 | avctx->channels = 1; |
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42 | avctx->channel_layout = AV_CH_LAYOUT_MONO; |
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43 | avctx->sample_fmt = AV_SAMPLE_FMT_S16; |
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44 | |||
45 | return 0; |
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46 | } |
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47 | |||
48 | static void do_output_subblock(RA144Context *ractx, const int16_t *lpc_coefs, |
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49 | int gval, GetBitContext *gb) |
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50 | { |
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51 | int cba_idx = get_bits(gb, 7); // index of the adaptive CB, 0 if none |
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52 | int gain = get_bits(gb, 8); |
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53 | int cb1_idx = get_bits(gb, 7); |
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54 | int cb2_idx = get_bits(gb, 7); |
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55 | |||
56 | ff_subblock_synthesis(ractx, lpc_coefs, cba_idx, cb1_idx, cb2_idx, gval, |
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57 | gain); |
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58 | } |
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59 | |||
60 | /** Uncompress one block (20 bytes -> 160*2 bytes). */ |
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61 | static int ra144_decode_frame(AVCodecContext * avctx, void *data, |
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62 | int *got_frame_ptr, AVPacket *avpkt) |
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63 | { |
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64 | AVFrame *frame = data; |
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65 | const uint8_t *buf = avpkt->data; |
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66 | int buf_size = avpkt->size; |
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67 | static const uint8_t sizes[LPC_ORDER] = {6, 5, 5, 4, 4, 3, 3, 3, 3, 2}; |
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68 | unsigned int refl_rms[NBLOCKS]; // RMS of the reflection coefficients |
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69 | int16_t block_coefs[NBLOCKS][LPC_ORDER]; // LPC coefficients of each sub-block |
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70 | unsigned int lpc_refl[LPC_ORDER]; // LPC reflection coefficients of the frame |
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71 | int i, j; |
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72 | int ret; |
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73 | int16_t *samples; |
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74 | unsigned int energy; |
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75 | |||
76 | RA144Context *ractx = avctx->priv_data; |
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77 | GetBitContext gb; |
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78 | |||
79 | if (buf_size < FRAME_SIZE) { |
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80 | av_log(avctx, AV_LOG_ERROR, |
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81 | "Frame too small (%d bytes). Truncated file?\n", buf_size); |
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82 | *got_frame_ptr = 0; |
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83 | return AVERROR_INVALIDDATA; |
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84 | } |
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85 | |||
86 | /* get output buffer */ |
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87 | frame->nb_samples = NBLOCKS * BLOCKSIZE; |
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88 | if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
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89 | return ret; |
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90 | samples = (int16_t *)frame->data[0]; |
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91 | |||
92 | init_get_bits8(&gb, buf, FRAME_SIZE); |
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93 | |||
94 | for (i = 0; i < LPC_ORDER; i++) |
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95 | lpc_refl[i] = ff_lpc_refl_cb[i][get_bits(&gb, sizes[i])]; |
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96 | |||
97 | ff_eval_coefs(ractx->lpc_coef[0], lpc_refl); |
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98 | ractx->lpc_refl_rms[0] = ff_rms(lpc_refl); |
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99 | |||
100 | energy = ff_energy_tab[get_bits(&gb, 5)]; |
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101 | |||
102 | refl_rms[0] = ff_interp(ractx, block_coefs[0], 1, 1, ractx->old_energy); |
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103 | refl_rms[1] = ff_interp(ractx, block_coefs[1], 2, |
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104 | energy <= ractx->old_energy, |
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105 | ff_t_sqrt(energy*ractx->old_energy) >> 12); |
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106 | refl_rms[2] = ff_interp(ractx, block_coefs[2], 3, 0, energy); |
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107 | refl_rms[3] = ff_rescale_rms(ractx->lpc_refl_rms[0], energy); |
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108 | |||
109 | ff_int_to_int16(block_coefs[3], ractx->lpc_coef[0]); |
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110 | |||
111 | for (i=0; i < NBLOCKS; i++) { |
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112 | do_output_subblock(ractx, block_coefs[i], refl_rms[i], &gb); |
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113 | |||
114 | for (j=0; j < BLOCKSIZE; j++) |
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115 | *samples++ = av_clip_int16(ractx->curr_sblock[j + 10] << 2); |
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116 | } |
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117 | |||
118 | ractx->old_energy = energy; |
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119 | ractx->lpc_refl_rms[1] = ractx->lpc_refl_rms[0]; |
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120 | |||
121 | FFSWAP(unsigned int *, ractx->lpc_coef[0], ractx->lpc_coef[1]); |
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122 | |||
123 | *got_frame_ptr = 1; |
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124 | |||
125 | return FRAME_SIZE; |
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126 | } |
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127 | |||
128 | AVCodec ff_ra_144_decoder = { |
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129 | .name = "real_144", |
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130 | .long_name = NULL_IF_CONFIG_SMALL("RealAudio 1.0 (14.4K)"), |
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131 | .type = AVMEDIA_TYPE_AUDIO, |
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132 | .id = AV_CODEC_ID_RA_144, |
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133 | .priv_data_size = sizeof(RA144Context), |
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134 | .init = ra144_decode_init, |
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135 | .decode = ra144_decode_frame, |
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136 | .capabilities = CODEC_CAP_DR1, |
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137 | };><>>>=>>>> |