| /* |
| * 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(const 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, |
| }; |