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|---|---|---|---|
| 1 | /* | ||
| 2 | * LEGO Racers ALP (.tun & .pcm) (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 | #include "libavutil/internal.h" | ||
| 34 | #include "libavutil/opt.h" | ||
| 35 | |||
| 36 | #define ALP_TAG MKTAG('A', 'L', 'P', ' ') | ||
| 37 | #define ALP_MAX_READ_SIZE 4096 | ||
| 38 | |||
| 39 | typedef struct ALPHeader { | ||
| 40 | uint32_t magic; /*< Magic Number, {'A', 'L', 'P', ' '} */ | ||
| 41 | uint32_t header_size; /*< Header size (after this). */ | ||
| 42 | char adpcm[6]; /*< "ADPCM" */ | ||
| 43 | uint8_t unk1; /*< Unknown */ | ||
| 44 | uint8_t num_channels; /*< Channel Count. */ | ||
| 45 | uint32_t sample_rate; /*< Sample rate, only if header_size >= 12. */ | ||
| 46 | } ALPHeader; | ||
| 47 | |||
| 48 | typedef enum ALPType { | ||
| 49 | ALP_TYPE_AUTO = 0, /*< Autodetect based on file extension. */ | ||
| 50 | ALP_TYPE_TUN = 1, /*< Force a .TUN file. */ | ||
| 51 | ALP_TYPE_PCM = 2, /*< Force a .PCM file. */ | ||
| 52 | } ALPType; | ||
| 53 | |||
| 54 | typedef struct ALPMuxContext { | ||
| 55 | const AVClass *class; | ||
| 56 | ALPType type; | ||
| 57 | } ALPMuxContext; | ||
| 58 | |||
| 59 | #if CONFIG_ALP_DEMUXER | ||
| 60 | 7474 | static int alp_probe(const AVProbeData *p) | |
| 61 | { | ||
| 62 | uint32_t i; | ||
| 63 | |||
| 64 |
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7474 | if (AV_RL32(p->buf) != ALP_TAG) |
| 65 | 7471 | return 0; | |
| 66 | |||
| 67 | /* Only allowed header sizes are 8 and 12. */ | ||
| 68 | 3 | i = AV_RL32(p->buf + 4); | |
| 69 |
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3 | if (i != 8 && i != 12) |
| 70 | ✗ | return 0; | |
| 71 | |||
| 72 |
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3 | if (strncmp("ADPCM", p->buf + 8, 6) != 0) |
| 73 | ✗ | return 0; | |
| 74 | |||
| 75 | 3 | return AVPROBE_SCORE_MAX - 1; | |
| 76 | } | ||
| 77 | |||
| 78 | 3 | static int alp_read_header(AVFormatContext *s) | |
| 79 | { | ||
| 80 | int ret; | ||
| 81 | AVStream *st; | ||
| 82 | 3 | ALPHeader *hdr = s->priv_data; | |
| 83 | AVCodecParameters *par; | ||
| 84 | |||
| 85 |
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3 | if ((hdr->magic = avio_rl32(s->pb)) != ALP_TAG) |
| 86 | ✗ | return AVERROR_INVALIDDATA; | |
| 87 | |||
| 88 | 3 | hdr->header_size = avio_rl32(s->pb); | |
| 89 | |||
| 90 |
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3 | if (hdr->header_size != 8 && hdr->header_size != 12) { |
| 91 | ✗ | return AVERROR_INVALIDDATA; | |
| 92 | } | ||
| 93 | |||
| 94 |
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3 | if ((ret = ffio_read_size(s->pb, hdr->adpcm, sizeof(hdr->adpcm))) < 0) |
| 95 | ✗ | return ret; | |
| 96 | |||
| 97 |
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3 | if (strncmp("ADPCM", hdr->adpcm, sizeof(hdr->adpcm)) != 0) |
| 98 | ✗ | return AVERROR_INVALIDDATA; | |
| 99 | |||
| 100 | 3 | hdr->unk1 = avio_r8(s->pb); | |
| 101 | 3 | hdr->num_channels = avio_r8(s->pb); | |
| 102 | |||
| 103 |
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3 | if (hdr->header_size == 8) { |
| 104 | /* .TUN music file */ | ||
| 105 | 1 | hdr->sample_rate = 22050; | |
| 106 | |||
| 107 | } else { | ||
| 108 | /* .PCM sound file */ | ||
| 109 | 2 | hdr->sample_rate = avio_rl32(s->pb); | |
| 110 | } | ||
| 111 | |||
| 112 |
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3 | if (hdr->sample_rate > 44100) { |
| 113 | ✗ | avpriv_request_sample(s, "Sample Rate > 44100"); | |
| 114 | ✗ | return AVERROR_PATCHWELCOME; | |
| 115 | } | ||
| 116 | |||
| 117 |
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3 | if (!(st = avformat_new_stream(s, NULL))) |
| 118 | ✗ | return AVERROR(ENOMEM); | |
| 119 | |||
| 120 | 3 | par = st->codecpar; | |
| 121 | 3 | par->codec_type = AVMEDIA_TYPE_AUDIO; | |
| 122 | 3 | par->codec_id = AV_CODEC_ID_ADPCM_IMA_ALP; | |
| 123 | 3 | par->format = AV_SAMPLE_FMT_S16; | |
| 124 | 3 | par->sample_rate = hdr->sample_rate; | |
| 125 | |||
| 126 |
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3 | if (hdr->num_channels > 2 || hdr->num_channels == 0) |
| 127 | ✗ | return AVERROR_INVALIDDATA; | |
| 128 | |||
| 129 | 3 | av_channel_layout_default(&par->ch_layout, hdr->num_channels); | |
| 130 | 3 | par->bits_per_coded_sample = 4; | |
| 131 | 3 | par->block_align = 1; | |
| 132 | 3 | par->bit_rate = par->ch_layout.nb_channels * | |
| 133 | 3 | par->sample_rate * | |
| 134 | 3 | par->bits_per_coded_sample; | |
| 135 | |||
| 136 | 3 | avpriv_set_pts_info(st, 64, 1, par->sample_rate); | |
| 137 | 3 | return 0; | |
| 138 | } | ||
| 139 | |||
| 140 | 90 | static int alp_read_packet(AVFormatContext *s, AVPacket *pkt) | |
| 141 | { | ||
| 142 | int ret; | ||
| 143 | 90 | AVCodecParameters *par = s->streams[0]->codecpar; | |
| 144 | |||
| 145 |
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90 | if ((ret = av_get_packet(s->pb, pkt, ALP_MAX_READ_SIZE)) < 0) |
| 146 | 5 | return ret; | |
| 147 | |||
| 148 | 85 | pkt->flags &= ~AV_PKT_FLAG_CORRUPT; | |
| 149 | 85 | pkt->stream_index = 0; | |
| 150 | 85 | pkt->duration = ret * 2 / par->ch_layout.nb_channels; | |
| 151 | |||
| 152 | 85 | return 0; | |
| 153 | } | ||
| 154 | |||
| 155 | ✗ | static int alp_seek(AVFormatContext *s, int stream_index, | |
| 156 | int64_t pts, int flags) | ||
| 157 | { | ||
| 158 | ✗ | const ALPHeader *hdr = s->priv_data; | |
| 159 | |||
| 160 | ✗ | if (pts != 0) | |
| 161 | ✗ | return AVERROR(EINVAL); | |
| 162 | |||
| 163 | ✗ | return avio_seek(s->pb, hdr->header_size + 8, SEEK_SET); | |
| 164 | } | ||
| 165 | |||
| 166 | const FFInputFormat ff_alp_demuxer = { | ||
| 167 | .p.name = "alp", | ||
| 168 | .p.long_name = NULL_IF_CONFIG_SMALL("LEGO Racers ALP"), | ||
| 169 | .priv_data_size = sizeof(ALPHeader), | ||
| 170 | .read_probe = alp_probe, | ||
| 171 | .read_header = alp_read_header, | ||
| 172 | .read_packet = alp_read_packet, | ||
| 173 | .read_seek = alp_seek, | ||
| 174 | }; | ||
| 175 | #endif | ||
| 176 | |||
| 177 | #if CONFIG_ALP_MUXER | ||
| 178 | |||
| 179 | 1 | static int alp_write_init(AVFormatContext *s) | |
| 180 | { | ||
| 181 | 1 | ALPMuxContext *alp = s->priv_data; | |
| 182 | AVCodecParameters *par; | ||
| 183 | |||
| 184 |
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1 | if (alp->type == ALP_TYPE_AUTO) { |
| 185 | ✗ | if (av_match_ext(s->url, "pcm")) | |
| 186 | ✗ | alp->type = ALP_TYPE_PCM; | |
| 187 | else | ||
| 188 | ✗ | alp->type = ALP_TYPE_TUN; | |
| 189 | } | ||
| 190 | |||
| 191 | 1 | par = s->streams[0]->codecpar; | |
| 192 | |||
| 193 |
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1 | if (par->ch_layout.nb_channels > 2) { |
| 194 | ✗ | av_log(s, AV_LOG_ERROR, "A maximum of 2 channels are supported\n"); | |
| 195 | ✗ | return AVERROR(EINVAL); | |
| 196 | } | ||
| 197 | |||
| 198 |
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1 | if (par->sample_rate > 44100) { |
| 199 | ✗ | av_log(s, AV_LOG_ERROR, "Sample rate too large\n"); | |
| 200 | ✗ | return AVERROR(EINVAL); | |
| 201 | } | ||
| 202 | |||
| 203 |
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1 | if (alp->type == ALP_TYPE_TUN && par->sample_rate != 22050) { |
| 204 | ✗ | av_log(s, AV_LOG_ERROR, "Sample rate must be 22050 for TUN files\n"); | |
| 205 | ✗ | return AVERROR(EINVAL); | |
| 206 | } | ||
| 207 | 1 | return 0; | |
| 208 | } | ||
| 209 | |||
| 210 | 1 | static int alp_write_header(AVFormatContext *s) | |
| 211 | { | ||
| 212 | 1 | ALPMuxContext *alp = s->priv_data; | |
| 213 | 1 | AVCodecParameters *par = s->streams[0]->codecpar; | |
| 214 | |||
| 215 | 1 | avio_wl32(s->pb, ALP_TAG); | |
| 216 |
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1 | avio_wl32(s->pb, alp->type == ALP_TYPE_PCM ? 12 : 8); |
| 217 | 1 | avio_write(s->pb, "ADPCM", 6); | |
| 218 | 1 | avio_w8(s->pb, 0); | |
| 219 | 1 | avio_w8(s->pb, par->ch_layout.nb_channels); | |
| 220 |
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1 | if (alp->type == ALP_TYPE_PCM) |
| 221 | 1 | avio_wl32(s->pb, par->sample_rate); | |
| 222 | |||
| 223 | 1 | return 0; | |
| 224 | } | ||
| 225 | |||
| 226 | enum { AE = AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM }; | ||
| 227 | |||
| 228 | static const AVOption alp_options[] = { | ||
| 229 | { | ||
| 230 | .name = "type", | ||
| 231 | .help = "set file type", | ||
| 232 | .offset = offsetof(ALPMuxContext, type), | ||
| 233 | .type = AV_OPT_TYPE_INT, | ||
| 234 | .default_val = {.i64 = ALP_TYPE_AUTO}, | ||
| 235 | .min = ALP_TYPE_AUTO, | ||
| 236 | .max = ALP_TYPE_PCM, | ||
| 237 | .flags = AE, | ||
| 238 | .unit = "type", | ||
| 239 | }, | ||
| 240 | { | ||
| 241 | .name = "auto", | ||
| 242 | .help = "autodetect based on file extension", | ||
| 243 | .offset = 0, | ||
| 244 | .type = AV_OPT_TYPE_CONST, | ||
| 245 | .default_val = {.i64 = ALP_TYPE_AUTO}, | ||
| 246 | .min = 0, | ||
| 247 | .max = 0, | ||
| 248 | .flags = AE, | ||
| 249 | .unit = "type" | ||
| 250 | }, | ||
| 251 | { | ||
| 252 | .name = "tun", | ||
| 253 | .help = "force .tun, used for music", | ||
| 254 | .offset = 0, | ||
| 255 | .type = AV_OPT_TYPE_CONST, | ||
| 256 | .default_val = {.i64 = ALP_TYPE_TUN}, | ||
| 257 | .min = 0, | ||
| 258 | .max = 0, | ||
| 259 | .flags = AE, | ||
| 260 | .unit = "type" | ||
| 261 | }, | ||
| 262 | { | ||
| 263 | .name = "pcm", | ||
| 264 | .help = "force .pcm, used for sfx", | ||
| 265 | .offset = 0, | ||
| 266 | .type = AV_OPT_TYPE_CONST, | ||
| 267 | .default_val = {.i64 = ALP_TYPE_PCM}, | ||
| 268 | .min = 0, | ||
| 269 | .max = 0, | ||
| 270 | .flags = AE, | ||
| 271 | .unit = "type" | ||
| 272 | }, | ||
| 273 | { NULL } | ||
| 274 | }; | ||
| 275 | |||
| 276 | static const AVClass alp_muxer_class = { | ||
| 277 | .class_name = "alp", | ||
| 278 | .item_name = av_default_item_name, | ||
| 279 | .option = alp_options, | ||
| 280 | .version = LIBAVUTIL_VERSION_INT | ||
| 281 | }; | ||
| 282 | |||
| 283 | const FFOutputFormat ff_alp_muxer = { | ||
| 284 | .p.name = "alp", | ||
| 285 | .p.long_name = NULL_IF_CONFIG_SMALL("LEGO Racers ALP"), | ||
| 286 | .p.extensions = "tun,pcm", | ||
| 287 | .p.audio_codec = AV_CODEC_ID_ADPCM_IMA_ALP, | ||
| 288 | .p.video_codec = AV_CODEC_ID_NONE, | ||
| 289 | .p.subtitle_codec = AV_CODEC_ID_NONE, | ||
| 290 | .p.priv_class = &alp_muxer_class, | ||
| 291 | .flags_internal = FF_OFMT_FLAG_MAX_ONE_OF_EACH | | ||
| 292 | FF_OFMT_FLAG_ONLY_DEFAULT_CODECS, | ||
| 293 | .init = alp_write_init, | ||
| 294 | .write_header = alp_write_header, | ||
| 295 | .write_packet = ff_raw_write_packet, | ||
| 296 | .priv_data_size = sizeof(ALPMuxContext) | ||
| 297 | }; | ||
| 298 | #endif | ||
| 299 |