1/* 2 * Ensoniq Paris Audio File 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 27static int epaf_probe(AVProbeData *p) 28{ 29 if (((AV_RL32(p->buf) == MKTAG('f','a','p',' ') && 30 AV_RL32(p->buf + 8) == 1) || 31 (AV_RL32(p->buf) == MKTAG(' ','p','a','f') && 32 AV_RN32(p->buf + 8) == 0)) && 33 !AV_RN32(p->buf + 4) && AV_RN32(p->buf + 12) && 34 AV_RN32(p->buf + 20)) 35 return AVPROBE_SCORE_MAX / 4 * 3; 36 return 0; 37} 38 39static int epaf_read_header(AVFormatContext *s) 40{ 41 int le, sample_rate, codec, channels; 42 AVStream *st; 43 44 avio_skip(s->pb, 4); 45 if (avio_rl32(s->pb)) 46 return AVERROR_INVALIDDATA; 47 48 le = avio_rl32(s->pb); 49 if (le && le != 1) 50 return AVERROR_INVALIDDATA; 51 52 if (le) { 53 sample_rate = avio_rl32(s->pb); 54 codec = avio_rl32(s->pb); 55 channels = avio_rl32(s->pb); 56 } else { 57 sample_rate = avio_rb32(s->pb); 58 codec = avio_rb32(s->pb); 59 channels = avio_rb32(s->pb); 60 } 61 62 if (!channels || !sample_rate) 63 return AVERROR_INVALIDDATA; 64 65 st = avformat_new_stream(s, NULL); 66 if (!st) 67 return AVERROR(ENOMEM); 68 69 st->codec->codec_type = AVMEDIA_TYPE_AUDIO; 70 st->codec->channels = channels; 71 st->codec->sample_rate = sample_rate; 72 switch (codec) { 73 case 0: 74 st->codec->codec_id = le ? AV_CODEC_ID_PCM_S16LE : AV_CODEC_ID_PCM_S16BE; 75 break; 76 case 2: 77 st->codec->codec_id = AV_CODEC_ID_PCM_S8; 78 break; 79 case 1: 80 avpriv_request_sample(s, "24-bit Paris PCM format"); 81 default: 82 return AVERROR_INVALIDDATA; 83 } 84 85 st->codec->bits_per_coded_sample = av_get_bits_per_sample(st->codec->codec_id); 86 st->codec->block_align = st->codec->bits_per_coded_sample * st->codec->channels / 8; 87 88 avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); 89 90 if (avio_skip(s->pb, 2024) < 0) 91 return AVERROR_INVALIDDATA; 92 return 0; 93} 94 95AVInputFormat ff_epaf_demuxer = { 96 .name = "epaf", 97 .long_name = NULL_IF_CONFIG_SMALL("Ensoniq Paris Audio File"), 98 .read_probe = epaf_probe, 99 .read_header = epaf_read_header, 100 .read_packet = ff_pcm_read_packet, 101 .read_seek = ff_pcm_read_seek, 102 .extensions = "paf,fap", 103 .flags = AVFMT_GENERIC_INDEX, 104}; 105