| 1 | /* |
| 2 | * IRCAM demuxer |
| 3 | * Copyright (c) 2012 Paul B Mahol |
| 4 | * |
| 5 | * This file is part of FFmpeg. |
| 6 | * |
| 7 | * FFmpeg is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU Lesser General Public |
| 9 | * License as published by the Free Software Foundation; either |
| 10 | * version 2.1 of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * FFmpeg is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * Lesser General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Lesser General Public |
| 18 | * License along with FFmpeg; if not, write to the Free Software |
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 20 | */ |
| 21 | |
| 22 | #include "libavutil/intreadwrite.h" |
| 23 | #include "avformat.h" |
| 24 | #include "internal.h" |
| 25 | #include "pcm.h" |
| 26 | #include "ircam.h" |
| 27 | |
| 28 | static int ircam_probe(AVProbeData *p) |
| 29 | { |
| 30 | if ((p->buf[0] == 0x64 && p->buf[1] == 0xA3 && p->buf[3] == 0x00 && |
| 31 | p->buf[2] >= 1 && p->buf[2] <= 4) || |
| 32 | (p->buf[3] == 0x64 && p->buf[2] == 0xA3 && p->buf[0] == 0x00 && |
| 33 | p->buf[1] >= 1 && p->buf[1] <= 3) && |
| 34 | AV_RN32(p->buf + 4) && AV_RN32(p->buf + 8)) |
| 35 | return AVPROBE_SCORE_MAX / 4 * 3; |
| 36 | return 0; |
| 37 | } |
| 38 | |
| 39 | static const struct endianess { |
| 40 | uint32_t magic; |
| 41 | int is_le; |
| 42 | } table[] = { |
| 43 | { 0x64A30100, 0 }, |
| 44 | { 0x64A30200, 1 }, |
| 45 | { 0x64A30300, 0 }, |
| 46 | { 0x64A30400, 1 }, |
| 47 | { 0x0001A364, 1 }, |
| 48 | { 0x0002A364, 0 }, |
| 49 | { 0x0003A364, 1 }, |
| 50 | }; |
| 51 | |
| 52 | static int ircam_read_header(AVFormatContext *s) |
| 53 | { |
| 54 | uint32_t magic, sample_rate, channels, tag; |
| 55 | const AVCodecTag *tags; |
| 56 | int le = -1, i; |
| 57 | AVStream *st; |
| 58 | |
| 59 | magic = avio_rl32(s->pb); |
| 60 | for (i = 0; i < 7; i++) { |
| 61 | if (magic == table[i].magic) { |
| 62 | le = table[i].is_le; |
| 63 | break; |
| 64 | } |
| 65 | } |
| 66 | |
| 67 | if (le == 1) { |
| 68 | sample_rate = av_int2float(avio_rl32(s->pb)); |
| 69 | channels = avio_rl32(s->pb); |
| 70 | tag = avio_rl32(s->pb); |
| 71 | tags = ff_codec_ircam_le_tags; |
| 72 | } else if (le == 0) { |
| 73 | sample_rate = av_int2float(avio_rb32(s->pb)); |
| 74 | channels = avio_rb32(s->pb); |
| 75 | tag = avio_rb32(s->pb); |
| 76 | tags = ff_codec_ircam_be_tags; |
| 77 | } else { |
| 78 | return AVERROR_INVALIDDATA; |
| 79 | } |
| 80 | |
| 81 | if (!channels || !sample_rate) |
| 82 | return AVERROR_INVALIDDATA; |
| 83 | |
| 84 | st = avformat_new_stream(s, NULL); |
| 85 | if (!st) |
| 86 | return AVERROR(ENOMEM); |
| 87 | |
| 88 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
| 89 | st->codec->channels = channels; |
| 90 | st->codec->sample_rate = sample_rate; |
| 91 | |
| 92 | st->codec->codec_id = ff_codec_get_id(tags, tag); |
| 93 | if (st->codec->codec_id == AV_CODEC_ID_NONE) { |
| 94 | av_log(s, AV_LOG_ERROR, "unknown tag %X\n", tag); |
| 95 | return AVERROR_INVALIDDATA; |
| 96 | } |
| 97 | |
| 98 | st->codec->bits_per_coded_sample = av_get_bits_per_sample(st->codec->codec_id); |
| 99 | st->codec->block_align = st->codec->bits_per_coded_sample * st->codec->channels / 8; |
| 100 | avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); |
| 101 | avio_skip(s->pb, 1008); |
| 102 | |
| 103 | return 0; |
| 104 | } |
| 105 | |
| 106 | AVInputFormat ff_ircam_demuxer = { |
| 107 | .name = "ircam", |
| 108 | .long_name = NULL_IF_CONFIG_SMALL("Berkeley/IRCAM/CARL Sound Format"), |
| 109 | .read_probe = ircam_probe, |
| 110 | .read_header = ircam_read_header, |
| 111 | .read_packet = ff_pcm_read_packet, |
| 112 | .read_seek = ff_pcm_read_seek, |
| 113 | .extensions = "sf,ircam", |
| 114 | .flags = AVFMT_GENERIC_INDEX, |
| 115 | }; |