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75 lines
2.4 KiB
75 lines
2.4 KiB
/* |
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* ACM demuxer |
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* Copyright (c) 2015 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 "avformat.h" |
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#include "rawdec.h" |
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#include "internal.h" |
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static int acm_probe(AVProbeData *p) |
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{ |
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if (AV_RB32(p->buf) != 0x97280301) |
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return 0; |
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return AVPROBE_SCORE_MAX / 3 * 2; |
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} |
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static int acm_read_header(AVFormatContext *s) |
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{ |
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AVStream *st; |
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int ret; |
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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->codec_id = AV_CODEC_ID_INTERPLAY_ACM; |
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ff_alloc_extradata(st->codecpar, 14); |
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if (!st->codecpar->extradata) |
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return AVERROR(ENOMEM); |
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ret = avio_read(s->pb, st->codecpar->extradata, 14); |
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if (ret < 10) |
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return ret < 0 ? ret : AVERROR_EOF; |
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st->codecpar->channels = AV_RL16(st->codecpar->extradata + 8); |
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st->codecpar->sample_rate = AV_RL16(st->codecpar->extradata + 10); |
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if (st->codecpar->channels <= 0 || st->codecpar->sample_rate <= 0) |
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return AVERROR_INVALIDDATA; |
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st->start_time = 0; |
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st->duration = AV_RL32(st->codecpar->extradata + 4) / st->codecpar->channels; |
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st->need_parsing = AVSTREAM_PARSE_FULL_RAW; |
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avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate); |
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return 0; |
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} |
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AVInputFormat ff_acm_demuxer = { |
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.name = "acm", |
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.long_name = NULL_IF_CONFIG_SMALL("Interplay ACM"), |
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.read_probe = acm_probe, |
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.read_header = acm_read_header, |
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.read_packet = ff_raw_read_partial_packet, |
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.flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH | AVFMT_NO_BYTE_SEEK | AVFMT_NOTIMESTAMPS, |
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.extensions = "acm", |
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.raw_codec_id = AV_CODEC_ID_INTERPLAY_ACM, |
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};
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