1cabdff1aSopenharmony_ci/* 2cabdff1aSopenharmony_ci * ACM demuxer 3cabdff1aSopenharmony_ci * Copyright (c) 2015 Paul B Mahol 4cabdff1aSopenharmony_ci * 5cabdff1aSopenharmony_ci * This file is part of FFmpeg. 6cabdff1aSopenharmony_ci * 7cabdff1aSopenharmony_ci * FFmpeg is free software; you can redistribute it and/or 8cabdff1aSopenharmony_ci * modify it under the terms of the GNU Lesser General Public 9cabdff1aSopenharmony_ci * License as published by the Free Software Foundation; either 10cabdff1aSopenharmony_ci * version 2.1 of the License, or (at your option) any later version. 11cabdff1aSopenharmony_ci * 12cabdff1aSopenharmony_ci * FFmpeg is distributed in the hope that it will be useful, 13cabdff1aSopenharmony_ci * but WITHOUT ANY WARRANTY; without even the implied warranty of 14cabdff1aSopenharmony_ci * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15cabdff1aSopenharmony_ci * Lesser General Public License for more details. 16cabdff1aSopenharmony_ci * 17cabdff1aSopenharmony_ci * You should have received a copy of the GNU Lesser General Public 18cabdff1aSopenharmony_ci * License along with FFmpeg; if not, write to the Free Software 19cabdff1aSopenharmony_ci * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20cabdff1aSopenharmony_ci */ 21cabdff1aSopenharmony_ci 22cabdff1aSopenharmony_ci#include "libavutil/intreadwrite.h" 23cabdff1aSopenharmony_ci#include "avformat.h" 24cabdff1aSopenharmony_ci#include "demux.h" 25cabdff1aSopenharmony_ci#include "rawdec.h" 26cabdff1aSopenharmony_ci#include "internal.h" 27cabdff1aSopenharmony_ci 28cabdff1aSopenharmony_cistatic int acm_probe(const AVProbeData *p) 29cabdff1aSopenharmony_ci{ 30cabdff1aSopenharmony_ci if (AV_RB32(p->buf) != 0x97280301) 31cabdff1aSopenharmony_ci return 0; 32cabdff1aSopenharmony_ci 33cabdff1aSopenharmony_ci return AVPROBE_SCORE_MAX / 3 * 2; 34cabdff1aSopenharmony_ci} 35cabdff1aSopenharmony_ci 36cabdff1aSopenharmony_cistatic int acm_read_header(AVFormatContext *s) 37cabdff1aSopenharmony_ci{ 38cabdff1aSopenharmony_ci AVStream *st; 39cabdff1aSopenharmony_ci int ret; 40cabdff1aSopenharmony_ci 41cabdff1aSopenharmony_ci st = avformat_new_stream(s, NULL); 42cabdff1aSopenharmony_ci if (!st) 43cabdff1aSopenharmony_ci return AVERROR(ENOMEM); 44cabdff1aSopenharmony_ci 45cabdff1aSopenharmony_ci st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; 46cabdff1aSopenharmony_ci st->codecpar->codec_id = AV_CODEC_ID_INTERPLAY_ACM; 47cabdff1aSopenharmony_ci 48cabdff1aSopenharmony_ci ret = ff_get_extradata(s, st->codecpar, s->pb, 14); 49cabdff1aSopenharmony_ci if (ret < 0) 50cabdff1aSopenharmony_ci return ret; 51cabdff1aSopenharmony_ci 52cabdff1aSopenharmony_ci st->codecpar->ch_layout.nb_channels = AV_RL16(st->codecpar->extradata + 8); 53cabdff1aSopenharmony_ci st->codecpar->sample_rate = AV_RL16(st->codecpar->extradata + 10); 54cabdff1aSopenharmony_ci if (st->codecpar->ch_layout.nb_channels <= 0 || st->codecpar->sample_rate <= 0) 55cabdff1aSopenharmony_ci return AVERROR_INVALIDDATA; 56cabdff1aSopenharmony_ci st->start_time = 0; 57cabdff1aSopenharmony_ci st->duration = AV_RL32(st->codecpar->extradata + 4) / st->codecpar->ch_layout.nb_channels; 58cabdff1aSopenharmony_ci ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL_RAW; 59cabdff1aSopenharmony_ci avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate); 60cabdff1aSopenharmony_ci 61cabdff1aSopenharmony_ci return 0; 62cabdff1aSopenharmony_ci} 63cabdff1aSopenharmony_ci 64cabdff1aSopenharmony_ciconst AVInputFormat ff_acm_demuxer = { 65cabdff1aSopenharmony_ci .name = "acm", 66cabdff1aSopenharmony_ci .long_name = NULL_IF_CONFIG_SMALL("Interplay ACM"), 67cabdff1aSopenharmony_ci .read_probe = acm_probe, 68cabdff1aSopenharmony_ci .read_header = acm_read_header, 69cabdff1aSopenharmony_ci .read_packet = ff_raw_read_partial_packet, 70cabdff1aSopenharmony_ci .flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH | AVFMT_NO_BYTE_SEEK | AVFMT_NOTIMESTAMPS, 71cabdff1aSopenharmony_ci .extensions = "acm", 72cabdff1aSopenharmony_ci .raw_codec_id = AV_CODEC_ID_INTERPLAY_ACM, 73cabdff1aSopenharmony_ci .priv_data_size = sizeof(FFRawDemuxerContext), 74cabdff1aSopenharmony_ci .priv_class = &ff_raw_demuxer_class, 75cabdff1aSopenharmony_ci}; 76