diff options
Diffstat (limited to 'libavformat/acm.c')
-rw-r--r-- | libavformat/acm.c | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/libavformat/acm.c b/libavformat/acm.c new file mode 100644 index 0000000000..08dd9282fa --- /dev/null +++ b/libavformat/acm.c @@ -0,0 +1,75 @@ +/* + * 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(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; + + ff_alloc_extradata(st->codecpar, 14); + if (!st->codecpar->extradata) + return AVERROR(ENOMEM); + ret = avio_read(s->pb, st->codecpar->extradata, 14); + if (ret < 10) + return ret < 0 ? ret : AVERROR_EOF; + + 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; +} + +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, +}; |