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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 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 | }; |