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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * Xiph CELT parser for Ogg |
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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 | |||
| 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 oggcelt_private { |
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| 30 | int extra_headers_left; |
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| 31 | }; |
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| 32 | |||
| 33 | static int celt_header(AVFormatContext *s, int idx) |
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| 34 | { |
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| 35 | struct ogg *ogg = s->priv_data; |
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| 36 | struct ogg_stream *os = ogg->streams + idx; |
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| 37 | AVStream *st = s->streams[idx]; |
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| 38 | struct oggcelt_private *priv = os->private; |
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| 39 | uint8_t *p = os->buf + os->pstart; |
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| 40 | |||
| 41 | if (os->psize == 60 && |
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| 42 | !memcmp(p, ff_celt_codec.magic, ff_celt_codec.magicsize)) { |
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| 43 | /* Main header */ |
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| 44 | |||
| 45 | uint32_t version, sample_rate, nb_channels, frame_size; |
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| 46 | uint32_t overlap, extra_headers; |
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| 47 | |||
| 48 | priv = av_malloc(sizeof(struct oggcelt_private)); |
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| 49 | if (!priv) |
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| 50 | return AVERROR(ENOMEM); |
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| 51 | if (ff_alloc_extradata(st->codec, 2 * sizeof(uint32_t)) < 0) |
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| 52 | return AVERROR(ENOMEM); |
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| 53 | version = AV_RL32(p + 28); |
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| 54 | /* unused header size field skipped */ |
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| 55 | sample_rate = AV_RL32(p + 36); |
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| 56 | nb_channels = AV_RL32(p + 40); |
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| 57 | frame_size = AV_RL32(p + 44); |
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| 58 | overlap = AV_RL32(p + 48); |
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| 59 | /* unused bytes per packet field skipped */ |
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| 60 | extra_headers = AV_RL32(p + 56); |
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| 61 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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| 62 | st->codec->codec_id = AV_CODEC_ID_CELT; |
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| 63 | st->codec->sample_rate = sample_rate; |
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| 64 | st->codec->channels = nb_channels; |
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| 65 | st->codec->frame_size = frame_size; |
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| 66 | if (sample_rate) |
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| 67 | avpriv_set_pts_info(st, 64, 1, sample_rate); |
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| 68 | priv->extra_headers_left = 1 + extra_headers; |
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| 69 | av_free(os->private); |
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| 70 | os->private = priv; |
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| 71 | AV_WL32(st->codec->extradata + 0, overlap); |
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| 72 | AV_WL32(st->codec->extradata + 4, version); |
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| 73 | return 1; |
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| 74 | } else if (priv && priv->extra_headers_left) { |
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| 75 | /* Extra headers (vorbiscomment) */ |
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| 76 | |||
| 77 | ff_vorbis_comment(s, &st->metadata, p, os->psize); |
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| 78 | priv->extra_headers_left--; |
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| 79 | return 1; |
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| 80 | } else { |
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| 81 | return 0; |
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| 82 | } |
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| 83 | } |
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| 84 | |||
| 85 | const struct ogg_codec ff_celt_codec = { |
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| 86 | .magic = "CELT ", |
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| 87 | .magicsize = 8, |
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| 88 | .header = celt_header, |
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| 89 | .nb_header = 2, |
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| 90 | }; |