diff options
author | Paul B Mahol <onemda@gmail.com> | 2017-01-21 14:29:44 +0300 |
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committer | Paul B Mahol <onemda@gmail.com> | 2017-01-25 14:00:02 +0300 |
commit | b953aec3c408049680ae722cf703b778b6e806d2 (patch) | |
tree | 3ca006bc8371f4ac1ad9d03fe4539428fcc80f0a /libavformat/sdxdec.c | |
parent | a135b017dec55d7cd10d400081f7eee3b32210c8 (diff) |
avformat: add Sample Dump eXchange demuxer
Signed-off-by: Paul B Mahol <onemda@gmail.com>
Diffstat (limited to 'libavformat/sdxdec.c')
-rw-r--r-- | libavformat/sdxdec.c | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/libavformat/sdxdec.c b/libavformat/sdxdec.c new file mode 100644 index 0000000000..e8e7a4f88d --- /dev/null +++ b/libavformat/sdxdec.c @@ -0,0 +1,90 @@ +/* + * SDX demuxer + * Copyright (c) 2017 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/avstring.h" +#include "libavutil/intreadwrite.h" +#include "avformat.h" +#include "internal.h" +#include "pcm.h" + +static int sdx_probe(AVProbeData *p) +{ + if (AV_RB32(p->buf) == AV_RB32("SDX:")) + return AVPROBE_SCORE_EXTENSION; + return 0; +} + +static int sdx_read_header(AVFormatContext *s) +{ + AVStream *st; + int depth, length; + + avio_skip(s->pb, 4); + while (!avio_feof(s->pb)) { + if (avio_r8(s->pb) == 0x1a) + break; + } + if (avio_r8(s->pb) != 1) + return AVERROR_INVALIDDATA; + length = avio_r8(s->pb); + avio_skip(s->pb, length); + avio_skip(s->pb, 4); + depth = avio_r8(s->pb); + + st = avformat_new_stream(s, NULL); + if (!st) + return AVERROR(ENOMEM); + + st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; + st->codecpar->channels = 1; + st->codecpar->sample_rate = avio_rl32(s->pb); + switch (depth) { + case 8: + st->codecpar->codec_id = AV_CODEC_ID_PCM_U8; + break; + case 16: + st->codecpar->codec_id = AV_CODEC_ID_PCM_U16LE; + break; + case 24: + st->codecpar->codec_id = AV_CODEC_ID_PCM_U24LE; + break; + case 32: + st->codecpar->codec_id = AV_CODEC_ID_PCM_U32LE; + break; + default: + return AVERROR_INVALIDDATA; + } + avio_skip(s->pb, 16); + st->codecpar->block_align = depth / 8; + + return 0; +} + +AVInputFormat ff_sdx_demuxer = { + .name = "sdx", + .long_name = NULL_IF_CONFIG_SMALL("Sample Dump eXchange"), + .read_probe = sdx_probe, + .read_header = sdx_read_header, + .read_packet = ff_pcm_read_packet, + .read_seek = ff_pcm_read_seek, + .extensions = "sdx", + .flags = AVFMT_GENERIC_INDEX, +}; |