| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * SVS demuxer | ||
| 3 | * Copyright (c) 2020 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 | 7125 | static int svs_probe(const AVProbeData *p) | |
| 29 | { | ||
| 30 |
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7125 | if (p->buf_size < 32) |
| 31 | ✗ | return 0; | |
| 32 | |||
| 33 |
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7125 | if (memcmp(p->buf, "SVS\00", 4)) |
| 34 | 7125 | return 0; | |
| 35 | |||
| 36 | ✗ | if (AV_RL32(p->buf + 16) == 0) | |
| 37 | ✗ | return 0; | |
| 38 | |||
| 39 | ✗ | return AVPROBE_SCORE_MAX / 3; | |
| 40 | } | ||
| 41 | |||
| 42 | ✗ | static int svs_read_header(AVFormatContext *s) | |
| 43 | { | ||
| 44 | AVStream *st; | ||
| 45 | uint32_t pitch; | ||
| 46 | |||
| 47 | ✗ | st = avformat_new_stream(s, NULL); | |
| 48 | ✗ | if (!st) | |
| 49 | ✗ | return AVERROR(ENOMEM); | |
| 50 | |||
| 51 | ✗ | avio_skip(s->pb, 16); | |
| 52 | ✗ | pitch = avio_rl32(s->pb); | |
| 53 | ✗ | avio_skip(s->pb, 12); | |
| 54 | |||
| 55 | ✗ | st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; | |
| 56 | ✗ | st->codecpar->codec_id = AV_CODEC_ID_ADPCM_PSX; | |
| 57 | ✗ | st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO; | |
| 58 | ✗ | st->codecpar->sample_rate = av_rescale_rnd(pitch, 48000, 4096, AV_ROUND_INF); | |
| 59 | ✗ | st->codecpar->block_align = 32; | |
| 60 | ✗ | st->start_time = 0; | |
| 61 | ✗ | if (s->pb->seekable & AVIO_SEEKABLE_NORMAL) | |
| 62 | ✗ | st->duration = av_get_audio_frame_duration2(st->codecpar, | |
| 63 | ✗ | avio_size(s->pb) - 32); | |
| 64 | |||
| 65 | ✗ | avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate); | |
| 66 | |||
| 67 | ✗ | return 0; | |
| 68 | } | ||
| 69 | |||
| 70 | ✗ | static int svs_read_packet(AVFormatContext *s, AVPacket *pkt) | |
| 71 | { | ||
| 72 | int ret; | ||
| 73 | |||
| 74 | ✗ | if (avio_feof(s->pb)) | |
| 75 | ✗ | return AVERROR_EOF; | |
| 76 | |||
| 77 | ✗ | ret = av_get_packet(s->pb, pkt, 32 * 256); | |
| 78 | ✗ | if (ret != 32 * 256) { | |
| 79 | ✗ | if (ret < 0) | |
| 80 | ✗ | return ret; | |
| 81 | ✗ | pkt->flags &= ~AV_PKT_FLAG_CORRUPT; | |
| 82 | } | ||
| 83 | ✗ | pkt->stream_index = 0; | |
| 84 | |||
| 85 | ✗ | return ret; | |
| 86 | } | ||
| 87 | |||
| 88 | const FFInputFormat ff_svs_demuxer = { | ||
| 89 | .p.name = "svs", | ||
| 90 | .p.long_name = NULL_IF_CONFIG_SMALL("Square SVS"), | ||
| 91 | .p.extensions = "svs", | ||
| 92 | .read_probe = svs_probe, | ||
| 93 | .read_header = svs_read_header, | ||
| 94 | .read_packet = svs_read_packet, | ||
| 95 | }; | ||
| 96 |