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https://github.com/FFmpeg/FFmpeg.git
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a085cfa654
It is only used by demuxers (although it is hypothetically possible that some day e.g. a protocol might need it, but that is unlikely given that they don't deal with AVCodecParameters). Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
76 lines
2.5 KiB
C
76 lines
2.5 KiB
C
/*
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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 "demux.h"
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#include "rawdec.h"
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#include "internal.h"
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static int acm_probe(const 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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ret = ff_get_extradata(s, st->codecpar, s->pb, 14);
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if (ret < 0)
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return ret;
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st->codecpar->ch_layout.nb_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->ch_layout.nb_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->ch_layout.nb_channels;
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ffstream(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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const 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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.priv_data_size = sizeof(FFRawDemuxerContext),
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.priv_class = &ff_raw_demuxer_class,
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};
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