diff options
Diffstat (limited to 'libavformat/vag.c')
-rw-r--r-- | libavformat/vag.c | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/libavformat/vag.c b/libavformat/vag.c new file mode 100644 index 0000000000..e8ebcaffd6 --- /dev/null +++ b/libavformat/vag.c @@ -0,0 +1,83 @@ +/* + * VAG 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 vag_probe(AVProbeData *p) +{ + if (memcmp(p->buf, "VAGp\0\0\0", 7)) + return 0; + + return AVPROBE_SCORE_MAX; +} + +static int vag_read_header(AVFormatContext *s) +{ + AVStream *st; + + st = avformat_new_stream(s, NULL); + if (!st) + return AVERROR(ENOMEM); + + avio_skip(s->pb, 4); + st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; + st->codecpar->codec_id = AV_CODEC_ID_ADPCM_PSX; + st->codecpar->channels = 1 + (avio_rb32(s->pb) == 0x00000004); + avio_skip(s->pb, 4); + if (st->codecpar->channels > 1) { + st->duration = avio_rb32(s->pb); + } else { + st->duration = avio_rb32(s->pb) / 16 * 28; + } + st->codecpar->sample_rate = avio_rb32(s->pb); + if (st->codecpar->sample_rate <= 0) + return AVERROR_INVALIDDATA; + avio_seek(s->pb, 0x1000, SEEK_SET); + if (avio_rl32(s->pb) == MKTAG('V','A','G','p')) { + st->codecpar->block_align = 0x1000 * st->codecpar->channels; + avio_seek(s->pb, 0, SEEK_SET); + st->duration = st->duration / 16 * 28; + } else { + st->codecpar->block_align = 16 * st->codecpar->channels; + avio_seek(s->pb, st->codecpar->channels > 1 ? 0x80 : 0x30, SEEK_SET); + } + avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate); + + return 0; +} + +static int vag_read_packet(AVFormatContext *s, AVPacket *pkt) +{ + AVCodecParameters *par = s->streams[0]->codecpar; + + return av_get_packet(s->pb, pkt, par->block_align); +} + +AVInputFormat ff_vag_demuxer = { + .name = "vag", + .long_name = NULL_IF_CONFIG_SMALL("Sony PS2 VAG"), + .read_probe = vag_probe, + .read_header = vag_read_header, + .read_packet = vag_read_packet, + .extensions = "vag", +}; |