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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * Opus parser for Ogg |
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| 3 | * Copyright (c) 2012 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 | |||
| 24 | #include "libavutil/intreadwrite.h" |
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| 25 | #include "avformat.h" |
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| 26 | #include "internal.h" |
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| 27 | #include "oggdec.h" |
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| 28 | |||
| 29 | struct oggopus_private { |
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| 30 | int need_comments; |
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| 31 | unsigned pre_skip; |
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| 32 | int64_t cur_dts; |
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| 33 | }; |
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| 34 | |||
| 35 | #define OPUS_HEAD_SIZE 19 |
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| 36 | |||
| 37 | static int opus_header(AVFormatContext *avf, int idx) |
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| 38 | { |
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| 39 | struct ogg *ogg = avf->priv_data; |
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| 40 | struct ogg_stream *os = &ogg->streams[idx]; |
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| 41 | AVStream *st = avf->streams[idx]; |
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| 42 | struct oggopus_private *priv = os->private; |
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| 43 | uint8_t *packet = os->buf + os->pstart; |
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| 44 | |||
| 45 | if (!priv) { |
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| 46 | priv = os->private = av_mallocz(sizeof(*priv)); |
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| 47 | if (!priv) |
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| 48 | return AVERROR(ENOMEM); |
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| 49 | } |
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| 50 | |||
| 51 | if (os->flags & OGG_FLAG_BOS) { |
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| 52 | if (os->psize < OPUS_HEAD_SIZE || (AV_RL8(packet + 8) & 0xF0) != 0) |
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| 53 | return AVERROR_INVALIDDATA; |
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| 54 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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| 55 | st->codec->codec_id = AV_CODEC_ID_OPUS; |
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| 56 | st->codec->channels = AV_RL8 (packet + 9); |
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| 57 | priv->pre_skip = AV_RL16(packet + 10); |
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| 58 | /*orig_sample_rate = AV_RL32(packet + 12);*/ |
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| 59 | /*gain = AV_RL16(packet + 16);*/ |
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| 60 | /*channel_map = AV_RL8 (packet + 18);*/ |
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| 61 | |||
| 62 | if (ff_alloc_extradata(st->codec, os->psize)) |
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| 63 | return AVERROR(ENOMEM); |
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| 64 | |||
| 65 | memcpy(st->codec->extradata, packet, os->psize); |
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| 66 | |||
| 67 | st->codec->sample_rate = 48000; |
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| 68 | avpriv_set_pts_info(st, 64, 1, 48000); |
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| 69 | priv->need_comments = 1; |
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| 70 | return 1; |
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| 71 | } |
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| 72 | |||
| 73 | if (priv->need_comments) { |
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| 74 | if (os->psize < 8 || memcmp(packet, "OpusTags", 8)) |
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| 75 | return AVERROR_INVALIDDATA; |
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| 76 | ff_vorbis_comment(avf, &st->metadata, packet + 8, os->psize - 8); |
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| 77 | priv->need_comments--; |
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| 78 | return 1; |
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| 79 | } |
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| 80 | |||
| 81 | return 0; |
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| 82 | } |
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| 83 | |||
| 84 | static int opus_packet(AVFormatContext *avf, int idx) |
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| 85 | { |
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| 86 | struct ogg *ogg = avf->priv_data; |
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| 87 | struct ogg_stream *os = &ogg->streams[idx]; |
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| 88 | AVStream *st = avf->streams[idx]; |
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| 89 | struct oggopus_private *priv = os->private; |
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| 90 | uint8_t *packet = os->buf + os->pstart; |
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| 91 | unsigned toc, toc_config, toc_count, frame_size, nb_frames = 1; |
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| 92 | |||
| 93 | if (!os->psize) |
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| 94 | return AVERROR_INVALIDDATA; |
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| 95 | |||
| 96 | toc = *packet; |
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| 97 | toc_config = toc >> 3; |
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| 98 | toc_count = toc & 3; |
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| 99 | frame_size = toc_config < 12 ? FFMAX(480, 960 * (toc_config & 3)) : |
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| 100 | toc_config < 16 ? 480 << (toc_config & 1) : |
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| 101 | 120 << (toc_config & 3); |
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| 102 | if (toc_count == 3) { |
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| 103 | if (os->psize < 2) |
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| 104 | return AVERROR_INVALIDDATA; |
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| 105 | nb_frames = packet[1] & 0x3F; |
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| 106 | } else if (toc_count) { |
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| 107 | nb_frames = 2; |
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| 108 | } |
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| 109 | |||
| 110 | os->pduration = frame_size * nb_frames; |
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| 111 | if (os->lastpts != AV_NOPTS_VALUE) { |
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| 112 | if (st->start_time == AV_NOPTS_VALUE) |
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| 113 | st->start_time = os->lastpts; |
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| 114 | priv->cur_dts = os->lastdts = os->lastpts -= priv->pre_skip; |
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| 115 | } |
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| 116 | |||
| 117 | priv->cur_dts += os->pduration; |
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| 118 | if ((os->flags & OGG_FLAG_EOS)) { |
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| 119 | int64_t skip = priv->cur_dts - os->granule + priv->pre_skip; |
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| 120 | skip = FFMIN(skip, os->pduration); |
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| 121 | if (skip > 0) { |
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| 122 | os->pduration = skip < os->pduration ? os->pduration - skip : 1; |
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| 123 | os->end_trimming = skip; |
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| 124 | av_log(avf, AV_LOG_DEBUG, |
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| 125 | "Last packet was truncated to %d due to end trimming.\n", |
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| 126 | os->pduration); |
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| 127 | } |
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| 128 | } |
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| 129 | |||
| 130 | return 0; |
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| 131 | } |
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| 132 | |||
| 133 | const struct ogg_codec ff_opus_codec = { |
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| 134 | .name = "Opus", |
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| 135 | .magic = "OpusHead", |
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| 136 | .magicsize = 8, |
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| 137 | .header = opus_header, |
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| 138 | .packet = opus_packet, |
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| 139 | .nb_header = 1, |
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| 140 | }; |