From 3919089beb50618587214cc078b6af900c45203b Mon Sep 17 00:00:00 2001 From: Paul B Mahol Date: Wed, 14 Oct 2015 11:58:38 +0200 Subject: avformat: add ads demuxer Signed-off-by: Paul B Mahol --- libavformat/ads.c | 89 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 89 insertions(+) create mode 100644 libavformat/ads.c (limited to 'libavformat/ads.c') diff --git a/libavformat/ads.c b/libavformat/ads.c new file mode 100644 index 0000000000..94f6428397 --- /dev/null +++ b/libavformat/ads.c @@ -0,0 +1,89 @@ +/* + * ADS/SS2 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/channel_layout.h" +#include "avformat.h" +#include "internal.h" + +static int ads_probe(AVProbeData *p) +{ + if (memcmp(p->buf, "SShd", 4) || + memcmp(p->buf+32, "SSbd", 4)) + return 0; + + return AVPROBE_SCORE_MAX / 3 * 2; +} + +static int ads_read_header(AVFormatContext *s) +{ + int align, codec, size; + AVStream *st; + + st = avformat_new_stream(s, NULL); + if (!st) + return AVERROR(ENOMEM); + + avio_skip(s->pb, 8); + st->codec->codec_type = AVMEDIA_TYPE_AUDIO; + codec = avio_rl32(s->pb); + st->codec->sample_rate = avio_rl32(s->pb); + if (st->codec->sample_rate <= 0) + return AVERROR_INVALIDDATA; + st->codec->channels = avio_rl32(s->pb); + if (st->codec->channels <= 0) + return AVERROR_INVALIDDATA; + align = avio_rl32(s->pb); + if (align <= 0 || align > INT_MAX / st->codec->channels) + return AVERROR_INVALIDDATA; + + if (codec == 1) + st->codec->codec_id = AV_CODEC_ID_PCM_S16LE_PLANAR; + else + st->codec->codec_id = AV_CODEC_ID_ADPCM_PSX; + + st->codec->block_align = st->codec->channels * align; + avio_skip(s->pb, 12); + size = avio_rl32(s->pb); + if (st->codec->codec_id == AV_CODEC_ID_ADPCM_PSX) + st->duration = (size - 0x40) / 16 / st->codec->channels * 28; + avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); + + return 0; +} + +static int ads_read_packet(AVFormatContext *s, AVPacket *pkt) +{ + AVCodecContext *codec = s->streams[0]->codec; + int ret; + + ret = av_get_packet(s->pb, pkt, codec->block_align); + pkt->stream_index = 0; + return ret; +} + +AVInputFormat ff_ads_demuxer = { + .name = "ads", + .long_name = NULL_IF_CONFIG_SMALL("Sony ADS"), + .read_probe = ads_probe, + .read_header = ads_read_header, + .read_packet = ads_read_packet, + .extensions = "ads,ss2", +}; -- cgit v1.2.3