| Line | Branch | Exec | Source |
|---|---|---|---|
| 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 "demux.h" | ||
| 24 | #include "internal.h" | ||
| 25 | |||
| 26 | 7186 | static int dcstr_probe(const AVProbeData *p) | |
| 27 | { | ||
| 28 |
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7186 | if (p->buf_size < 224 || memcmp(p->buf + 213, "Sega Stream", 11)) |
| 29 | 7186 | return 0; | |
| 30 | |||
| 31 | ✗ | return AVPROBE_SCORE_MAX; | |
| 32 | } | ||
| 33 | |||
| 34 | ✗ | static int dcstr_read_header(AVFormatContext *s) | |
| 35 | { | ||
| 36 | unsigned codec, align; | ||
| 37 | int mult; | ||
| 38 | AVStream *st; | ||
| 39 | |||
| 40 | ✗ | st = avformat_new_stream(s, NULL); | |
| 41 | ✗ | if (!st) | |
| 42 | ✗ | return AVERROR(ENOMEM); | |
| 43 | |||
| 44 | ✗ | st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; | |
| 45 | ✗ | st->codecpar->ch_layout.nb_channels = avio_rl32(s->pb); | |
| 46 | ✗ | st->codecpar->sample_rate = avio_rl32(s->pb); | |
| 47 | ✗ | if (st->codecpar->sample_rate <= 0) | |
| 48 | ✗ | return AVERROR_INVALIDDATA; | |
| 49 | ✗ | codec = avio_rl32(s->pb); | |
| 50 | ✗ | align = avio_rl32(s->pb); | |
| 51 | ✗ | avio_skip(s->pb, 4); | |
| 52 | ✗ | st->duration = avio_rl32(s->pb); | |
| 53 | ✗ | mult = avio_rl32(s->pb); | |
| 54 | ✗ | if (st->codecpar->ch_layout.nb_channels <= 0 || mult <= 0 || | |
| 55 | ✗ | mult > INT_MAX / st->codecpar->ch_layout.nb_channels) { | |
| 56 | ✗ | av_log(s, AV_LOG_ERROR, "invalid number of channels %d x %d\n", | |
| 57 | ✗ | st->codecpar->ch_layout.nb_channels, mult); | |
| 58 | ✗ | return AVERROR_INVALIDDATA; | |
| 59 | } | ||
| 60 | ✗ | st->codecpar->ch_layout.nb_channels *= mult; | |
| 61 | ✗ | if (!align || align > INT_MAX / st->codecpar->ch_layout.nb_channels) | |
| 62 | ✗ | return AVERROR_INVALIDDATA; | |
| 63 | ✗ | st->codecpar->block_align = align * st->codecpar->ch_layout.nb_channels; | |
| 64 | |||
| 65 | ✗ | switch (codec) { | |
| 66 | ✗ | case 4: st->codecpar->codec_id = AV_CODEC_ID_ADPCM_AICA; break; | |
| 67 | ✗ | case 16: st->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE_PLANAR; break; | |
| 68 | ✗ | default: avpriv_request_sample(s, "codec %X", codec); | |
| 69 | ✗ | return AVERROR_PATCHWELCOME; | |
| 70 | } | ||
| 71 | |||
| 72 | ✗ | avio_skip(s->pb, 0x800 - avio_tell(s->pb)); | |
| 73 | ✗ | avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate); | |
| 74 | |||
| 75 | ✗ | return 0; | |
| 76 | } | ||
| 77 | |||
| 78 | ✗ | static int dcstr_read_packet(AVFormatContext *s, AVPacket *pkt) | |
| 79 | { | ||
| 80 | ✗ | AVCodecParameters *par = s->streams[0]->codecpar; | |
| 81 | ✗ | return av_get_packet(s->pb, pkt, par->block_align); | |
| 82 | } | ||
| 83 | |||
| 84 | const FFInputFormat ff_dcstr_demuxer = { | ||
| 85 | .p.name = "dcstr", | ||
| 86 | .p.long_name = NULL_IF_CONFIG_SMALL("Sega DC STR"), | ||
| 87 | .p.extensions = "str", | ||
| 88 | .p.flags = AVFMT_GENERIC_INDEX | AVFMT_NO_BYTE_SEEK | AVFMT_NOBINSEARCH, | ||
| 89 | .read_probe = dcstr_probe, | ||
| 90 | .read_header = dcstr_read_header, | ||
| 91 | .read_packet = dcstr_read_packet, | ||
| 92 | }; | ||
| 93 |