blob: e8e7a4f88d05e0054b4e13b905dd6efa72339b41
| 1 | /* |
| 2 | * SDX demuxer |
| 3 | * Copyright (c) 2017 Paul B Mahol |
| 4 | * |
| 5 | * This file is part of FFmpeg. |
| 6 | * |
| 7 | * FFmpeg is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU Lesser General Public |
| 9 | * License as published by the Free Software Foundation; either |
| 10 | * version 2.1 of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * FFmpeg is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * Lesser General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Lesser General Public |
| 18 | * License along with FFmpeg; if not, write to the Free Software |
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 20 | */ |
| 21 | |
| 22 | #include "libavutil/avstring.h" |
| 23 | #include "libavutil/intreadwrite.h" |
| 24 | #include "avformat.h" |
| 25 | #include "internal.h" |
| 26 | #include "pcm.h" |
| 27 | |
| 28 | static int sdx_probe(AVProbeData *p) |
| 29 | { |
| 30 | if (AV_RB32(p->buf) == AV_RB32("SDX:")) |
| 31 | return AVPROBE_SCORE_EXTENSION; |
| 32 | return 0; |
| 33 | } |
| 34 | |
| 35 | static int sdx_read_header(AVFormatContext *s) |
| 36 | { |
| 37 | AVStream *st; |
| 38 | int depth, length; |
| 39 | |
| 40 | avio_skip(s->pb, 4); |
| 41 | while (!avio_feof(s->pb)) { |
| 42 | if (avio_r8(s->pb) == 0x1a) |
| 43 | break; |
| 44 | } |
| 45 | if (avio_r8(s->pb) != 1) |
| 46 | return AVERROR_INVALIDDATA; |
| 47 | length = avio_r8(s->pb); |
| 48 | avio_skip(s->pb, length); |
| 49 | avio_skip(s->pb, 4); |
| 50 | depth = avio_r8(s->pb); |
| 51 | |
| 52 | st = avformat_new_stream(s, NULL); |
| 53 | if (!st) |
| 54 | return AVERROR(ENOMEM); |
| 55 | |
| 56 | st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
| 57 | st->codecpar->channels = 1; |
| 58 | st->codecpar->sample_rate = avio_rl32(s->pb); |
| 59 | switch (depth) { |
| 60 | case 8: |
| 61 | st->codecpar->codec_id = AV_CODEC_ID_PCM_U8; |
| 62 | break; |
| 63 | case 16: |
| 64 | st->codecpar->codec_id = AV_CODEC_ID_PCM_U16LE; |
| 65 | break; |
| 66 | case 24: |
| 67 | st->codecpar->codec_id = AV_CODEC_ID_PCM_U24LE; |
| 68 | break; |
| 69 | case 32: |
| 70 | st->codecpar->codec_id = AV_CODEC_ID_PCM_U32LE; |
| 71 | break; |
| 72 | default: |
| 73 | return AVERROR_INVALIDDATA; |
| 74 | } |
| 75 | avio_skip(s->pb, 16); |
| 76 | st->codecpar->block_align = depth / 8; |
| 77 | |
| 78 | return 0; |
| 79 | } |
| 80 | |
| 81 | AVInputFormat ff_sdx_demuxer = { |
| 82 | .name = "sdx", |
| 83 | .long_name = NULL_IF_CONFIG_SMALL("Sample Dump eXchange"), |
| 84 | .read_probe = sdx_probe, |
| 85 | .read_header = sdx_read_header, |
| 86 | .read_packet = ff_pcm_read_packet, |
| 87 | .read_seek = ff_pcm_read_seek, |
| 88 | .extensions = "sdx", |
| 89 | .flags = AVFMT_GENERIC_INDEX, |
| 90 | }; |
| 91 |