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