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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 6148 | serge | 1 | /* |
| 2 | * IRCAM demuxer |
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| 3 | * Copyright (c) 2012 Paul B Mahol |
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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 "libavutil/intreadwrite.h" |
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| 23 | #include "avformat.h" |
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| 24 | #include "internal.h" |
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| 25 | #include "pcm.h" |
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| 26 | #include "ircam.h" |
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| 27 | |||
| 28 | static int ircam_probe(AVProbeData *p) |
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| 29 | { |
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| 30 | if ((p->buf[0] == 0x64 && p->buf[1] == 0xA3 && p->buf[3] == 0x00 && |
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| 31 | p->buf[2] >= 1 && p->buf[2] <= 4) || |
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| 32 | (p->buf[3] == 0x64 && p->buf[2] == 0xA3 && p->buf[0] == 0x00 && |
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| 33 | p->buf[1] >= 1 && p->buf[1] <= 3) && |
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| 34 | AV_RN32(p->buf + 4) && AV_RN32(p->buf + 8)) |
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| 35 | return AVPROBE_SCORE_MAX / 4 * 3; |
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| 36 | return 0; |
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| 37 | } |
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| 38 | |||
| 39 | static const struct endianess { |
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| 40 | uint32_t magic; |
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| 41 | int is_le; |
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| 42 | } table[] = { |
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| 43 | { 0x64A30100, 0 }, |
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| 44 | { 0x64A30200, 1 }, |
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| 45 | { 0x64A30300, 0 }, |
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| 46 | { 0x64A30400, 1 }, |
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| 47 | { 0x0001A364, 1 }, |
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| 48 | { 0x0002A364, 0 }, |
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| 49 | { 0x0003A364, 1 }, |
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| 50 | }; |
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| 51 | |||
| 52 | static int ircam_read_header(AVFormatContext *s) |
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| 53 | { |
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| 54 | uint32_t magic, sample_rate, channels, tag; |
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| 55 | const AVCodecTag *tags; |
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| 56 | int le = -1, i; |
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| 57 | AVStream *st; |
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| 58 | |||
| 59 | magic = avio_rl32(s->pb); |
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| 60 | for (i = 0; i < 7; i++) { |
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| 61 | if (magic == table[i].magic) { |
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| 62 | le = table[i].is_le; |
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| 63 | break; |
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| 64 | } |
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| 65 | } |
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| 66 | |||
| 67 | if (le == 1) { |
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| 68 | sample_rate = av_int2float(avio_rl32(s->pb)); |
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| 69 | channels = avio_rl32(s->pb); |
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| 70 | tag = avio_rl32(s->pb); |
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| 71 | tags = ff_codec_ircam_le_tags; |
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| 72 | } else if (le == 0) { |
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| 73 | sample_rate = av_int2float(avio_rb32(s->pb)); |
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| 74 | channels = avio_rb32(s->pb); |
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| 75 | tag = avio_rb32(s->pb); |
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| 76 | tags = ff_codec_ircam_be_tags; |
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| 77 | } else { |
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| 78 | return AVERROR_INVALIDDATA; |
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| 79 | } |
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| 80 | |||
| 81 | if (!channels || !sample_rate) |
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| 82 | return AVERROR_INVALIDDATA; |
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| 83 | |||
| 84 | st = avformat_new_stream(s, NULL); |
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| 85 | if (!st) |
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| 86 | return AVERROR(ENOMEM); |
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| 87 | |||
| 88 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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| 89 | st->codec->channels = channels; |
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| 90 | st->codec->sample_rate = sample_rate; |
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| 91 | |||
| 92 | st->codec->codec_id = ff_codec_get_id(tags, tag); |
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| 93 | if (st->codec->codec_id == AV_CODEC_ID_NONE) { |
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| 94 | av_log(s, AV_LOG_ERROR, "unknown tag %X\n", tag); |
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| 95 | return AVERROR_INVALIDDATA; |
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| 96 | } |
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| 97 | |||
| 98 | st->codec->bits_per_coded_sample = av_get_bits_per_sample(st->codec->codec_id); |
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| 99 | st->codec->block_align = st->codec->bits_per_coded_sample * st->codec->channels / 8; |
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| 100 | avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); |
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| 101 | avio_skip(s->pb, 1008); |
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| 102 | |||
| 103 | return 0; |
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| 104 | } |
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| 105 | |||
| 106 | AVInputFormat ff_ircam_demuxer = { |
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| 107 | .name = "ircam", |
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| 108 | .long_name = NULL_IF_CONFIG_SMALL("Berkeley/IRCAM/CARL Sound Format"), |
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| 109 | .read_probe = ircam_probe, |
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| 110 | .read_header = ircam_read_header, |
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| 111 | .read_packet = ff_pcm_read_packet, |
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| 112 | .read_seek = ff_pcm_read_seek, |
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| 113 | .extensions = "sf,ircam", |
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| 114 | .flags = AVFMT_GENERIC_INDEX, |
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| 115 | }; |