| /* |
| * Ensoniq Paris Audio File demuxer |
| * Copyright (c) 2012 Paul B Mahol |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include "libavutil/intreadwrite.h" |
| #include "libavcodec/internal.h" |
| #include "avformat.h" |
| #include "internal.h" |
| #include "pcm.h" |
| |
| static int epaf_probe(const AVProbeData *p) |
| { |
| if (((AV_RL32(p->buf) == MKTAG('f','a','p',' ') && |
| AV_RL32(p->buf + 8) == 1) || |
| (AV_RL32(p->buf) == MKTAG(' ','p','a','f') && |
| AV_RN32(p->buf + 8) == 0)) && |
| !AV_RN32(p->buf + 4) && AV_RN32(p->buf + 12) && |
| AV_RN32(p->buf + 20)) |
| return AVPROBE_SCORE_MAX / 4 * 3; |
| return 0; |
| } |
| |
| static int epaf_read_header(AVFormatContext *s) |
| { |
| int le, sample_rate, codec, channels; |
| AVStream *st; |
| |
| avio_skip(s->pb, 4); |
| if (avio_rl32(s->pb)) |
| return AVERROR_INVALIDDATA; |
| |
| le = avio_rl32(s->pb); |
| if (le && le != 1) |
| return AVERROR_INVALIDDATA; |
| |
| if (le) { |
| sample_rate = avio_rl32(s->pb); |
| codec = avio_rl32(s->pb); |
| channels = avio_rl32(s->pb); |
| } else { |
| sample_rate = avio_rb32(s->pb); |
| codec = avio_rb32(s->pb); |
| channels = avio_rb32(s->pb); |
| } |
| |
| if (channels <= 0 || channels > FF_SANE_NB_CHANNELS || sample_rate <= 0) |
| return AVERROR_INVALIDDATA; |
| |
| st = avformat_new_stream(s, NULL); |
| if (!st) |
| return AVERROR(ENOMEM); |
| |
| st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
| st->codecpar->channels = channels; |
| st->codecpar->sample_rate = sample_rate; |
| switch (codec) { |
| case 0: |
| st->codecpar->codec_id = le ? AV_CODEC_ID_PCM_S16LE : AV_CODEC_ID_PCM_S16BE; |
| break; |
| case 2: |
| st->codecpar->codec_id = AV_CODEC_ID_PCM_S8; |
| break; |
| case 1: |
| avpriv_request_sample(s, "24-bit Paris PCM format"); |
| default: |
| return AVERROR_INVALIDDATA; |
| } |
| |
| st->codecpar->bits_per_coded_sample = av_get_bits_per_sample(st->codecpar->codec_id); |
| st->codecpar->block_align = st->codecpar->bits_per_coded_sample * st->codecpar->channels / 8; |
| |
| avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate); |
| |
| if (avio_skip(s->pb, 2024) < 0) |
| return AVERROR_INVALIDDATA; |
| return 0; |
| } |
| |
| AVInputFormat ff_epaf_demuxer = { |
| .name = "epaf", |
| .long_name = NULL_IF_CONFIG_SMALL("Ensoniq Paris Audio File"), |
| .read_probe = epaf_probe, |
| .read_header = epaf_read_header, |
| .read_packet = ff_pcm_read_packet, |
| .read_seek = ff_pcm_read_seek, |
| .extensions = "paf,fap", |
| .flags = AVFMT_GENERIC_INDEX, |
| }; |