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4349 | Serge | 1 | /* |
2 | * Xiph CELT decoder using libcelt |
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3 | * Copyright (c) 2011 Nicolas George |
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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 | #include |
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23 | #include |
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24 | #include "avcodec.h" |
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25 | #include "internal.h" |
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26 | #include "libavutil/intreadwrite.h" |
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27 | |||
28 | struct libcelt_context { |
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29 | CELTMode *mode; |
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30 | CELTDecoder *dec; |
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31 | int discard; |
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32 | }; |
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33 | |||
34 | static int ff_celt_error_to_averror(int err) |
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35 | { |
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36 | switch (err) { |
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37 | case CELT_BAD_ARG: return AVERROR(EINVAL); |
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38 | #ifdef CELT_BUFFER_TOO_SMALL |
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39 | case CELT_BUFFER_TOO_SMALL: return AVERROR(ENOBUFS); |
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40 | #endif |
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41 | case CELT_INTERNAL_ERROR: return AVERROR(EFAULT); |
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42 | case CELT_CORRUPTED_DATA: return AVERROR_INVALIDDATA; |
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43 | case CELT_UNIMPLEMENTED: return AVERROR(ENOSYS); |
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44 | #ifdef ENOTRECOVERABLE |
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45 | case CELT_INVALID_STATE: return AVERROR(ENOTRECOVERABLE); |
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46 | #endif |
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47 | case CELT_ALLOC_FAIL: return AVERROR(ENOMEM); |
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48 | default: return AVERROR(EINVAL); |
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49 | } |
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50 | } |
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51 | |||
52 | static int ff_celt_bitstream_version_hack(CELTMode *mode) |
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53 | { |
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54 | CELTHeader header = { .version_id = 0 }; |
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55 | celt_header_init(&header, mode, 960, 2); |
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56 | return header.version_id; |
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57 | } |
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58 | |||
59 | static av_cold int libcelt_dec_init(AVCodecContext *c) |
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60 | { |
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61 | struct libcelt_context *celt = c->priv_data; |
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62 | int err; |
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63 | |||
64 | if (!c->channels || !c->frame_size || |
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65 | c->frame_size > INT_MAX / sizeof(int16_t) / c->channels) |
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66 | return AVERROR(EINVAL); |
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67 | celt->mode = celt_mode_create(c->sample_rate, c->frame_size, &err); |
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68 | if (!celt->mode) |
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69 | return ff_celt_error_to_averror(err); |
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70 | celt->dec = celt_decoder_create_custom(celt->mode, c->channels, &err); |
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71 | if (!celt->dec) { |
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72 | celt_mode_destroy(celt->mode); |
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73 | return ff_celt_error_to_averror(err); |
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74 | } |
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75 | if (c->extradata_size >= 4) { |
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76 | celt->discard = AV_RL32(c->extradata); |
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77 | if (celt->discard < 0 || celt->discard >= c->frame_size) { |
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78 | av_log(c, AV_LOG_WARNING, |
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79 | "Invalid overlap (%d), ignored.\n", celt->discard); |
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80 | celt->discard = 0; |
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81 | } |
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82 | } |
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83 | if (c->extradata_size >= 8) { |
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84 | unsigned version = AV_RL32(c->extradata + 4); |
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85 | unsigned lib_version = ff_celt_bitstream_version_hack(celt->mode); |
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86 | if (version != lib_version) |
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87 | av_log(c, AV_LOG_WARNING, |
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88 | "CELT bitstream version 0x%x may be " |
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89 | "improperly decoded by libcelt for version 0x%x.\n", |
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90 | version, lib_version); |
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91 | } |
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92 | c->sample_fmt = AV_SAMPLE_FMT_S16; |
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93 | return 0; |
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94 | } |
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95 | |||
96 | static av_cold int libcelt_dec_close(AVCodecContext *c) |
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97 | { |
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98 | struct libcelt_context *celt = c->priv_data; |
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99 | |||
100 | celt_decoder_destroy(celt->dec); |
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101 | celt_mode_destroy(celt->mode); |
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102 | return 0; |
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103 | } |
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104 | |||
105 | static int libcelt_dec_decode(AVCodecContext *c, void *data, |
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106 | int *got_frame_ptr, AVPacket *pkt) |
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107 | { |
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108 | struct libcelt_context *celt = c->priv_data; |
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109 | AVFrame *frame = data; |
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110 | int err; |
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111 | int16_t *pcm; |
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112 | |||
113 | frame->nb_samples = c->frame_size; |
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114 | if ((err = ff_get_buffer(c, frame, 0)) < 0) |
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115 | return err; |
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116 | pcm = (int16_t *)frame->data[0]; |
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117 | err = celt_decode(celt->dec, pkt->data, pkt->size, pcm, c->frame_size); |
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118 | if (err < 0) |
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119 | return ff_celt_error_to_averror(err); |
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120 | if (celt->discard) { |
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121 | frame->nb_samples -= celt->discard; |
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122 | memmove(pcm, pcm + celt->discard * c->channels, |
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123 | frame->nb_samples * c->channels * sizeof(int16_t)); |
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124 | celt->discard = 0; |
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125 | } |
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126 | *got_frame_ptr = 1; |
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127 | return pkt->size; |
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128 | } |
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129 | |||
130 | AVCodec ff_libcelt_decoder = { |
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131 | .name = "libcelt", |
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132 | .long_name = NULL_IF_CONFIG_SMALL("Xiph CELT decoder using libcelt"), |
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133 | .type = AVMEDIA_TYPE_AUDIO, |
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134 | .id = AV_CODEC_ID_CELT, |
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135 | .priv_data_size = sizeof(struct libcelt_context), |
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136 | .init = libcelt_dec_init, |
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137 | .close = libcelt_dec_close, |
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138 | .decode = libcelt_dec_decode, |
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139 | .capabilities = CODEC_CAP_DR1, |
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140 | };>>> |