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