blob: 6035dd43344cec78e209877ea41daa873b5dbd2f
| 1 | /* |
| 2 | * DC STR demuxer |
| 3 | * Copyright (c) 2015 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 "avformat.h" |
| 23 | #include "internal.h" |
| 24 | |
| 25 | static int dcstr_probe(AVProbeData *p) |
| 26 | { |
| 27 | if (p->buf_size < 224 || memcmp(p->buf + 213, "Sega Stream", 11)) |
| 28 | return 0; |
| 29 | |
| 30 | return AVPROBE_SCORE_MAX; |
| 31 | } |
| 32 | |
| 33 | static int dcstr_read_header(AVFormatContext *s) |
| 34 | { |
| 35 | unsigned codec, align; |
| 36 | int mult; |
| 37 | AVStream *st; |
| 38 | |
| 39 | st = avformat_new_stream(s, NULL); |
| 40 | if (!st) |
| 41 | return AVERROR(ENOMEM); |
| 42 | |
| 43 | st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
| 44 | st->codecpar->channels = avio_rl32(s->pb); |
| 45 | st->codecpar->sample_rate = avio_rl32(s->pb); |
| 46 | codec = avio_rl32(s->pb); |
| 47 | align = avio_rl32(s->pb); |
| 48 | avio_skip(s->pb, 4); |
| 49 | st->duration = avio_rl32(s->pb); |
| 50 | mult = avio_rl32(s->pb); |
| 51 | if (st->codecpar->channels <= 0 || mult <= 0 || mult > INT_MAX / st->codecpar->channels) { |
| 52 | av_log(s, AV_LOG_ERROR, "invalid number of channels %d x %d\n", st->codecpar->channels, mult); |
| 53 | return AVERROR_INVALIDDATA; |
| 54 | } |
| 55 | st->codecpar->channels *= mult; |
| 56 | if (!align || align > INT_MAX / st->codecpar->channels) |
| 57 | return AVERROR_INVALIDDATA; |
| 58 | st->codecpar->block_align = align * st->codecpar->channels; |
| 59 | |
| 60 | switch (codec) { |
| 61 | case 4: st->codecpar->codec_id = AV_CODEC_ID_ADPCM_AICA; break; |
| 62 | case 16: st->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE_PLANAR; break; |
| 63 | default: avpriv_request_sample(s, "codec %X", codec); |
| 64 | return AVERROR_PATCHWELCOME; |
| 65 | } |
| 66 | |
| 67 | avio_skip(s->pb, 0x800 - avio_tell(s->pb)); |
| 68 | avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate); |
| 69 | |
| 70 | return 0; |
| 71 | } |
| 72 | |
| 73 | static int dcstr_read_packet(AVFormatContext *s, AVPacket *pkt) |
| 74 | { |
| 75 | AVCodecParameters *par = s->streams[0]->codecpar; |
| 76 | return av_get_packet(s->pb, pkt, par->block_align); |
| 77 | } |
| 78 | |
| 79 | AVInputFormat ff_dcstr_demuxer = { |
| 80 | .name = "dcstr", |
| 81 | .long_name = NULL_IF_CONFIG_SMALL("Sega DC STR"), |
| 82 | .read_probe = dcstr_probe, |
| 83 | .read_header = dcstr_read_header, |
| 84 | .read_packet = dcstr_read_packet, |
| 85 | .extensions = "str", |
| 86 | .flags = AVFMT_GENERIC_INDEX | AVFMT_NO_BYTE_SEEK | AVFMT_NOBINSEARCH, |
| 87 | }; |
| 88 |