| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * Simon & Schuster Interactive VAG (de)muxer | ||
| 3 | * | ||
| 4 | * Copyright (C) 2020 Zane van Iperen (zane@zanevaniperen.com) | ||
| 5 | * | ||
| 6 | * This file is part of FFmpeg. | ||
| 7 | * | ||
| 8 | * FFmpeg is free software; you can redistribute it and/or | ||
| 9 | * modify it under the terms of the GNU Lesser General Public | ||
| 10 | * License as published by the Free Software Foundation; either | ||
| 11 | * version 2.1 of the License, or (at your option) any later version. | ||
| 12 | * | ||
| 13 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 16 | * Lesser General Public License for more details. | ||
| 17 | * | ||
| 18 | * You should have received a copy of the GNU Lesser General Public | ||
| 19 | * License along with FFmpeg; if not, write to the Free Software | ||
| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 21 | */ | ||
| 22 | |||
| 23 | #include "config_components.h" | ||
| 24 | |||
| 25 | #include "libavutil/channel_layout.h" | ||
| 26 | #include "avformat.h" | ||
| 27 | #include "avio_internal.h" | ||
| 28 | #include "demux.h" | ||
| 29 | #include "internal.h" | ||
| 30 | #include "mux.h" | ||
| 31 | #include "rawenc.h" | ||
| 32 | #include "libavutil/intreadwrite.h" | ||
| 33 | |||
| 34 | #define KVAG_TAG MKTAG('K', 'V', 'A', 'G') | ||
| 35 | #define KVAG_HEADER_SIZE 14 | ||
| 36 | #define KVAG_MAX_READ_SIZE 4096 | ||
| 37 | |||
| 38 | typedef struct KVAGHeader { | ||
| 39 | uint32_t magic; | ||
| 40 | uint32_t data_size; | ||
| 41 | uint32_t sample_rate; | ||
| 42 | uint16_t stereo; | ||
| 43 | } KVAGHeader; | ||
| 44 | |||
| 45 | #if CONFIG_KVAG_DEMUXER | ||
| 46 | 7125 | static int kvag_probe(const AVProbeData *p) | |
| 47 | { | ||
| 48 |
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7125 | if (AV_RL32(p->buf) != KVAG_TAG) |
| 49 | 7122 | return 0; | |
| 50 | |||
| 51 | 3 | return AVPROBE_SCORE_EXTENSION + 1; | |
| 52 | } | ||
| 53 | |||
| 54 | 3 | static int kvag_read_header(AVFormatContext *s) | |
| 55 | { | ||
| 56 | int ret; | ||
| 57 | AVStream *st; | ||
| 58 | KVAGHeader hdr; | ||
| 59 | AVCodecParameters *par; | ||
| 60 | uint8_t buf[KVAG_HEADER_SIZE]; | ||
| 61 | |||
| 62 |
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3 | if (!(st = avformat_new_stream(s, NULL))) |
| 63 | ✗ | return AVERROR(ENOMEM); | |
| 64 | |||
| 65 |
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3 | if ((ret = ffio_read_size(s->pb, buf, KVAG_HEADER_SIZE)) < 0) |
| 66 | ✗ | return ret; | |
| 67 | |||
| 68 | 3 | hdr.magic = AV_RL32(buf + 0); | |
| 69 | 3 | hdr.data_size = AV_RL32(buf + 4); | |
| 70 | 3 | hdr.sample_rate = AV_RL32(buf + 8); | |
| 71 | 3 | hdr.stereo = AV_RL16(buf + 12); | |
| 72 | |||
| 73 | 3 | par = st->codecpar; | |
| 74 | 3 | par->codec_type = AVMEDIA_TYPE_AUDIO; | |
| 75 | 3 | par->codec_id = AV_CODEC_ID_ADPCM_IMA_SSI; | |
| 76 | 3 | par->format = AV_SAMPLE_FMT_S16; | |
| 77 | |||
| 78 |
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3 | av_channel_layout_default(&par->ch_layout, !!hdr.stereo + 1); |
| 79 | 3 | par->sample_rate = hdr.sample_rate; | |
| 80 | 3 | par->bits_per_coded_sample = 4; | |
| 81 | 3 | par->block_align = 1; | |
| 82 | 3 | par->bit_rate = par->ch_layout.nb_channels * | |
| 83 | 3 | (uint64_t)par->sample_rate * | |
| 84 | 3 | par->bits_per_coded_sample; | |
| 85 | |||
| 86 | 3 | avpriv_set_pts_info(st, 64, 1, par->sample_rate); | |
| 87 | 3 | st->start_time = 0; | |
| 88 | 3 | st->duration = hdr.data_size * | |
| 89 | 3 | (8 / par->bits_per_coded_sample) / | |
| 90 | 3 | par->ch_layout.nb_channels; | |
| 91 | |||
| 92 | 3 | return 0; | |
| 93 | } | ||
| 94 | |||
| 95 | 130 | static int kvag_read_packet(AVFormatContext *s, AVPacket *pkt) | |
| 96 | { | ||
| 97 | int ret; | ||
| 98 | 130 | AVCodecParameters *par = s->streams[0]->codecpar; | |
| 99 | |||
| 100 |
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130 | if ((ret = av_get_packet(s->pb, pkt, KVAG_MAX_READ_SIZE)) < 0) |
| 101 | 3 | return ret; | |
| 102 | |||
| 103 | 127 | pkt->flags &= ~AV_PKT_FLAG_CORRUPT; | |
| 104 | 127 | pkt->stream_index = 0; | |
| 105 | 127 | pkt->duration = ret * (8 / par->bits_per_coded_sample) / par->ch_layout.nb_channels; | |
| 106 | |||
| 107 | 127 | return 0; | |
| 108 | } | ||
| 109 | |||
| 110 | ✗ | static int kvag_seek(AVFormatContext *s, int stream_index, | |
| 111 | int64_t pts, int flags) | ||
| 112 | { | ||
| 113 | ✗ | if (pts != 0) | |
| 114 | ✗ | return AVERROR(EINVAL); | |
| 115 | |||
| 116 | ✗ | return avio_seek(s->pb, KVAG_HEADER_SIZE, SEEK_SET); | |
| 117 | } | ||
| 118 | |||
| 119 | const FFInputFormat ff_kvag_demuxer = { | ||
| 120 | .p.name = "kvag", | ||
| 121 | .p.long_name = NULL_IF_CONFIG_SMALL("Simon & Schuster Interactive VAG"), | ||
| 122 | .read_probe = kvag_probe, | ||
| 123 | .read_header = kvag_read_header, | ||
| 124 | .read_packet = kvag_read_packet, | ||
| 125 | .read_seek = kvag_seek, | ||
| 126 | }; | ||
| 127 | #endif | ||
| 128 | |||
| 129 | #if CONFIG_KVAG_MUXER | ||
| 130 | 1 | static int kvag_write_init(AVFormatContext *s) | |
| 131 | { | ||
| 132 | 1 | AVCodecParameters *par = s->streams[0]->codecpar; | |
| 133 | |||
| 134 |
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1 | if (par->ch_layout.nb_channels > 2) { |
| 135 | ✗ | av_log(s, AV_LOG_ERROR, "KVAG files only support up to 2 channels\n"); | |
| 136 | ✗ | return AVERROR(EINVAL); | |
| 137 | } | ||
| 138 | |||
| 139 |
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1 | if (!(s->pb->seekable & AVIO_SEEKABLE_NORMAL)) { |
| 140 | ✗ | av_log(s, AV_LOG_WARNING, "Stream not seekable, unable to write output file\n"); | |
| 141 | ✗ | return AVERROR(EINVAL); | |
| 142 | } | ||
| 143 | |||
| 144 | 1 | return 0; | |
| 145 | } | ||
| 146 | |||
| 147 | 1 | static int kvag_write_header(AVFormatContext *s) | |
| 148 | { | ||
| 149 | uint8_t buf[KVAG_HEADER_SIZE]; | ||
| 150 | 1 | AVCodecParameters *par = s->streams[0]->codecpar; | |
| 151 | |||
| 152 | 1 | AV_WL32(buf + 0, KVAG_TAG); | |
| 153 | 1 | AV_WL32(buf + 4, 0); /* Data size, we fix this up later. */ | |
| 154 | 1 | AV_WL32(buf + 8, par->sample_rate); | |
| 155 | 1 | AV_WL16(buf + 12, par->ch_layout.nb_channels == 2); | |
| 156 | |||
| 157 | 1 | avio_write(s->pb, buf, sizeof(buf)); | |
| 158 | 1 | return 0; | |
| 159 | } | ||
| 160 | |||
| 161 | 1 | static int kvag_write_trailer(AVFormatContext *s) | |
| 162 | { | ||
| 163 | int64_t file_size, data_size; | ||
| 164 | |||
| 165 | 1 | file_size = avio_tell(s->pb); | |
| 166 | 1 | data_size = file_size - KVAG_HEADER_SIZE; | |
| 167 |
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1 | if (data_size < UINT32_MAX) { |
| 168 | 1 | avio_seek(s->pb, 4, SEEK_SET); | |
| 169 | 1 | avio_wl32(s->pb, (uint32_t)data_size); | |
| 170 | 1 | avio_seek(s->pb, file_size, SEEK_SET); | |
| 171 | } else { | ||
| 172 | ✗ | av_log(s, AV_LOG_WARNING, | |
| 173 | "Filesize %"PRId64" invalid for KVAG, output file will be broken\n", | ||
| 174 | file_size); | ||
| 175 | } | ||
| 176 | |||
| 177 | 1 | return 0; | |
| 178 | } | ||
| 179 | |||
| 180 | const FFOutputFormat ff_kvag_muxer = { | ||
| 181 | .p.name = "kvag", | ||
| 182 | .p.long_name = NULL_IF_CONFIG_SMALL("Simon & Schuster Interactive VAG"), | ||
| 183 | .p.extensions = "vag", | ||
| 184 | .p.audio_codec = AV_CODEC_ID_ADPCM_IMA_SSI, | ||
| 185 | .p.video_codec = AV_CODEC_ID_NONE, | ||
| 186 | .p.subtitle_codec = AV_CODEC_ID_NONE, | ||
| 187 | .flags_internal = FF_OFMT_FLAG_MAX_ONE_OF_EACH | | ||
| 188 | FF_OFMT_FLAG_ONLY_DEFAULT_CODECS, | ||
| 189 | .init = kvag_write_init, | ||
| 190 | .write_header = kvag_write_header, | ||
| 191 | .write_packet = ff_raw_write_packet, | ||
| 192 | .write_trailer = kvag_write_trailer | ||
| 193 | }; | ||
| 194 | #endif | ||
| 195 |