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 "libavcodec/internal.h" 24#include "avformat.h" 25#include "internal.h" 26#include "pcm.h" 27#include "ircam.h" 28 29static int ircam_probe(const AVProbeData *p) 30{ 31 if ((p->buf[0] == 0x64 && p->buf[1] == 0xA3 && p->buf[3] == 0x00 && 32 p->buf[2] >= 1 && p->buf[2] <= 4) || 33 (p->buf[3] == 0x64 && p->buf[2] == 0xA3 && p->buf[0] == 0x00 && 34 p->buf[1] >= 1 && p->buf[1] <= 3) && 35 AV_RN32(p->buf + 4) && AV_RN32(p->buf + 8)) 36 return AVPROBE_SCORE_MAX / 4 * 3; 37 return 0; 38} 39 40static const struct endianess { 41 uint32_t magic; 42 int is_le; 43} table[] = { 44 { 0x64A30100, 0 }, 45 { 0x64A30200, 1 }, 46 { 0x64A30300, 0 }, 47 { 0x64A30400, 1 }, 48 { 0x0001A364, 1 }, 49 { 0x0002A364, 0 }, 50 { 0x0003A364, 1 }, 51}; 52 53static int ircam_read_header(AVFormatContext *s) 54{ 55 uint32_t magic, sample_rate, channels, tag; 56 const AVCodecTag *tags; 57 int le = -1, i; 58 AVStream *st; 59 60 magic = avio_rl32(s->pb); 61 for (i = 0; i < 7; i++) { 62 if (magic == table[i].magic) { 63 le = table[i].is_le; 64 break; 65 } 66 } 67 68 if (le == 1) { 69 sample_rate = lrintf(av_int2float(avio_rl32(s->pb))); 70 channels = avio_rl32(s->pb); 71 tag = avio_rl32(s->pb); 72 tags = ff_codec_ircam_le_tags; 73 } else if (le == 0) { 74 sample_rate = lrintf(av_int2float(avio_rb32(s->pb))); 75 channels = avio_rb32(s->pb); 76 tag = avio_rb32(s->pb); 77 tags = ff_codec_ircam_be_tags; 78 } else { 79 return AVERROR_INVALIDDATA; 80 } 81 82 if (!channels || !sample_rate) 83 return AVERROR_INVALIDDATA; 84 85 st = avformat_new_stream(s, NULL); 86 if (!st) 87 return AVERROR(ENOMEM); 88 89 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; 90 st->codecpar->ch_layout.nb_channels = channels; 91 if (st->codecpar->ch_layout.nb_channels > FF_SANE_NB_CHANNELS) 92 return AVERROR(ENOSYS); 93 st->codecpar->sample_rate = sample_rate; 94 95 st->codecpar->codec_id = ff_codec_get_id(tags, tag); 96 if (st->codecpar->codec_id == AV_CODEC_ID_NONE) { 97 av_log(s, AV_LOG_ERROR, "unknown tag %"PRIx32"\n", tag); 98 return AVERROR_INVALIDDATA; 99 } 100 101 st->codecpar->bits_per_coded_sample = av_get_bits_per_sample(st->codecpar->codec_id); 102 st->codecpar->block_align = st->codecpar->bits_per_coded_sample * 103 st->codecpar->ch_layout.nb_channels / 8; 104 avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate); 105 avio_skip(s->pb, 1008); 106 107 return 0; 108} 109 110const AVInputFormat ff_ircam_demuxer = { 111 .name = "ircam", 112 .long_name = NULL_IF_CONFIG_SMALL("Berkeley/IRCAM/CARL Sound Format"), 113 .read_probe = ircam_probe, 114 .read_header = ircam_read_header, 115 .read_packet = ff_pcm_read_packet, 116 .read_seek = ff_pcm_read_seek, 117 .extensions = "sf,ircam", 118 .flags = AVFMT_GENERIC_INDEX, 119}; 120