| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * SDNS demuxer | ||
| 3 | * Copyright (c) 2023 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/channel_layout.h" | ||
| 23 | #include "libavutil/intreadwrite.h" | ||
| 24 | #include "avformat.h" | ||
| 25 | #include "demux.h" | ||
| 26 | #include "internal.h" | ||
| 27 | |||
| 28 | 7128 | static int sdns_probe(const AVProbeData *p) | |
| 29 | { | ||
| 30 |
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7128 | if (AV_RL32(p->buf) != MKTAG('S','D','N','S')) |
| 31 | 7128 | return 0; | |
| 32 | ✗ | if (AV_RB32(p->buf + 8) <= 0) | |
| 33 | ✗ | return 0; | |
| 34 | ✗ | if (AV_RB32(p->buf + 12) <= 0 || | |
| 35 | ✗ | AV_RB32(p->buf + 12) > 128) | |
| 36 | ✗ | return 0; | |
| 37 | ✗ | return AVPROBE_SCORE_MAX / 3; | |
| 38 | } | ||
| 39 | |||
| 40 | ✗ | static int sdns_read_header(AVFormatContext *s) | |
| 41 | { | ||
| 42 | ✗ | AVIOContext *pb = s->pb; | |
| 43 | AVCodecParameters *par; | ||
| 44 | int channels, ret; | ||
| 45 | AVStream *st; | ||
| 46 | |||
| 47 | ✗ | avio_skip(pb, 8); | |
| 48 | |||
| 49 | ✗ | st = avformat_new_stream(s, NULL); | |
| 50 | ✗ | if (!st) | |
| 51 | ✗ | return AVERROR(ENOMEM); | |
| 52 | |||
| 53 | ✗ | par = st->codecpar; | |
| 54 | ✗ | par->codec_type = AVMEDIA_TYPE_AUDIO; | |
| 55 | ✗ | par->codec_id = AV_CODEC_ID_XMA1; | |
| 56 | ✗ | par->sample_rate = avio_rb32(pb); | |
| 57 | ✗ | channels = avio_rb32(pb); | |
| 58 | ✗ | if (channels <= 0 || channels > 128) | |
| 59 | ✗ | return AVERROR_INVALIDDATA; | |
| 60 | ✗ | av_channel_layout_default(&par->ch_layout, channels); | |
| 61 | ✗ | if (par->sample_rate <= 0) | |
| 62 | ✗ | return AVERROR_INVALIDDATA; | |
| 63 | ✗ | par->block_align = 2048; | |
| 64 | ✗ | if ((ret = ff_alloc_extradata(par, 8 + 20 * ((channels + 1) / 2))) < 0) | |
| 65 | ✗ | return ret; | |
| 66 | ✗ | memset(par->extradata, 0, 28); | |
| 67 | ✗ | par->extradata[4] = (channels + 1) / 2; | |
| 68 | ✗ | for (int i = 0; i < par->extradata[4]; i++) | |
| 69 | ✗ | par->extradata[8 + 20 * i + 17] = FFMIN(2, channels - i * 2); | |
| 70 | ✗ | avpriv_set_pts_info(st, 64, 1, par->sample_rate); | |
| 71 | ✗ | avio_seek(pb, 0x1000, SEEK_SET); | |
| 72 | |||
| 73 | ✗ | return 0; | |
| 74 | } | ||
| 75 | |||
| 76 | ✗ | static int sdns_read_packet(AVFormatContext *s, AVPacket *pkt) | |
| 77 | { | ||
| 78 | int ret; | ||
| 79 | |||
| 80 | ✗ | if (avio_feof(s->pb)) | |
| 81 | ✗ | return AVERROR_EOF; | |
| 82 | ✗ | ret = av_get_packet(s->pb, pkt, 2048); | |
| 83 | ✗ | pkt->stream_index = 0; | |
| 84 | |||
| 85 | ✗ | return ret; | |
| 86 | } | ||
| 87 | |||
| 88 | const FFInputFormat ff_sdns_demuxer = { | ||
| 89 | .p.name = "sdns", | ||
| 90 | .p.long_name = NULL_IF_CONFIG_SMALL("Xbox SDNS"), | ||
| 91 | .p.flags = AVFMT_GENERIC_INDEX, | ||
| 92 | .p.extensions = "sdns", | ||
| 93 | .read_probe = sdns_probe, | ||
| 94 | .read_header = sdns_read_header, | ||
| 95 | .read_packet = sdns_read_packet, | ||
| 96 | }; | ||
| 97 |