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 28static 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 39static 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 52static 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 106AVInputFormat 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}; 116