| 1 | /* |
| 2 | * VQF demuxer |
| 3 | * Copyright (c) 2009 Vitor Sessak |
| 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 | #include "libavutil/intreadwrite.h" |
| 25 | #include "libavutil/dict.h" |
| 26 | #include "libavutil/mathematics.h" |
| 27 | #include "riff.h" |
| 28 | |
| 29 | typedef struct VqfContext { |
| 30 | int frame_bit_len; |
| 31 | uint8_t last_frame_bits; |
| 32 | int remaining_bits; |
| 33 | } VqfContext; |
| 34 | |
| 35 | static int vqf_probe(AVProbeData *probe_packet) |
| 36 | { |
| 37 | if (AV_RL32(probe_packet->buf) != MKTAG('T','W','I','N')) |
| 38 | return 0; |
| 39 | |
| 40 | if (!memcmp(probe_packet->buf + 4, "97012000", 8)) |
| 41 | return AVPROBE_SCORE_MAX; |
| 42 | |
| 43 | if (!memcmp(probe_packet->buf + 4, "00052200", 8)) |
| 44 | return AVPROBE_SCORE_MAX; |
| 45 | |
| 46 | if (AV_RL32(probe_packet->buf + 12) > (1<<27)) |
| 47 | return AVPROBE_SCORE_EXTENSION/2; |
| 48 | |
| 49 | return AVPROBE_SCORE_EXTENSION; |
| 50 | } |
| 51 | |
| 52 | static void add_metadata(AVFormatContext *s, uint32_t tag, |
| 53 | unsigned int tag_len, unsigned int remaining) |
| 54 | { |
| 55 | int len = FFMIN(tag_len, remaining); |
| 56 | char *buf, key[5] = {0}; |
| 57 | |
| 58 | if (len == UINT_MAX) |
| 59 | return; |
| 60 | |
| 61 | buf = av_malloc(len+1); |
| 62 | if (!buf) |
| 63 | return; |
| 64 | avio_read(s->pb, buf, len); |
| 65 | buf[len] = 0; |
| 66 | AV_WL32(key, tag); |
| 67 | av_dict_set(&s->metadata, key, buf, AV_DICT_DONT_STRDUP_VAL); |
| 68 | } |
| 69 | |
| 70 | static const AVMetadataConv vqf_metadata_conv[] = { |
| 71 | { "(c) ", "copyright" }, |
| 72 | { "ARNG", "arranger" }, |
| 73 | { "AUTH", "author" }, |
| 74 | { "BAND", "band" }, |
| 75 | { "CDCT", "conductor" }, |
| 76 | { "COMT", "comment" }, |
| 77 | { "FILE", "filename" }, |
| 78 | { "GENR", "genre" }, |
| 79 | { "LABL", "publisher" }, |
| 80 | { "MUSC", "composer" }, |
| 81 | { "NAME", "title" }, |
| 82 | { "NOTE", "note" }, |
| 83 | { "PROD", "producer" }, |
| 84 | { "PRSN", "personnel" }, |
| 85 | { "REMX", "remixer" }, |
| 86 | { "SING", "singer" }, |
| 87 | { "TRCK", "track" }, |
| 88 | { "WORD", "words" }, |
| 89 | { 0 }, |
| 90 | }; |
| 91 | |
| 92 | static int vqf_read_header(AVFormatContext *s) |
| 93 | { |
| 94 | VqfContext *c = s->priv_data; |
| 95 | AVStream *st = avformat_new_stream(s, NULL); |
| 96 | int chunk_tag; |
| 97 | int rate_flag = -1; |
| 98 | int header_size; |
| 99 | int read_bitrate = 0; |
| 100 | int size; |
| 101 | uint8_t comm_chunk[12]; |
| 102 | |
| 103 | if (!st) |
| 104 | return AVERROR(ENOMEM); |
| 105 | |
| 106 | avio_skip(s->pb, 12); |
| 107 | |
| 108 | header_size = avio_rb32(s->pb); |
| 109 | |
| 110 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
| 111 | st->codec->codec_id = AV_CODEC_ID_TWINVQ; |
| 112 | st->start_time = 0; |
| 113 | |
| 114 | do { |
| 115 | int len; |
| 116 | chunk_tag = avio_rl32(s->pb); |
| 117 | |
| 118 | if (chunk_tag == MKTAG('D','A','T','A')) |
| 119 | break; |
| 120 | |
| 121 | len = avio_rb32(s->pb); |
| 122 | |
| 123 | if ((unsigned) len > INT_MAX/2) { |
| 124 | av_log(s, AV_LOG_ERROR, "Malformed header\n"); |
| 125 | return -1; |
| 126 | } |
| 127 | |
| 128 | header_size -= 8; |
| 129 | |
| 130 | switch(chunk_tag){ |
| 131 | case MKTAG('C','O','M','M'): |
| 132 | avio_read(s->pb, comm_chunk, 12); |
| 133 | st->codec->channels = AV_RB32(comm_chunk ) + 1; |
| 134 | read_bitrate = AV_RB32(comm_chunk + 4); |
| 135 | rate_flag = AV_RB32(comm_chunk + 8); |
| 136 | avio_skip(s->pb, len-12); |
| 137 | |
| 138 | if (st->codec->channels <= 0) { |
| 139 | av_log(s, AV_LOG_ERROR, "Invalid number of channels\n"); |
| 140 | return AVERROR_INVALIDDATA; |
| 141 | } |
| 142 | |
| 143 | st->codec->bit_rate = read_bitrate*1000; |
| 144 | break; |
| 145 | case MKTAG('D','S','I','Z'): // size of compressed data |
| 146 | { |
| 147 | av_dict_set_int(&s->metadata, "size", avio_rb32(s->pb), 0); |
| 148 | } |
| 149 | break; |
| 150 | case MKTAG('Y','E','A','R'): // recording date |
| 151 | case MKTAG('E','N','C','D'): // compression date |
| 152 | case MKTAG('E','X','T','R'): // reserved |
| 153 | case MKTAG('_','Y','M','H'): // reserved |
| 154 | case MKTAG('_','N','T','T'): // reserved |
| 155 | case MKTAG('_','I','D','3'): // reserved for ID3 tags |
| 156 | avio_skip(s->pb, FFMIN(len, header_size)); |
| 157 | break; |
| 158 | default: |
| 159 | add_metadata(s, chunk_tag, len, header_size); |
| 160 | break; |
| 161 | } |
| 162 | |
| 163 | header_size -= len; |
| 164 | |
| 165 | } while (header_size >= 0 && !avio_feof(s->pb)); |
| 166 | |
| 167 | switch (rate_flag) { |
| 168 | case -1: |
| 169 | av_log(s, AV_LOG_ERROR, "COMM tag not found!\n"); |
| 170 | return -1; |
| 171 | case 44: |
| 172 | st->codec->sample_rate = 44100; |
| 173 | break; |
| 174 | case 22: |
| 175 | st->codec->sample_rate = 22050; |
| 176 | break; |
| 177 | case 11: |
| 178 | st->codec->sample_rate = 11025; |
| 179 | break; |
| 180 | default: |
| 181 | if (rate_flag < 8 || rate_flag > 44) { |
| 182 | av_log(s, AV_LOG_ERROR, "Invalid rate flag %d\n", rate_flag); |
| 183 | return AVERROR_INVALIDDATA; |
| 184 | } |
| 185 | st->codec->sample_rate = rate_flag*1000; |
| 186 | break; |
| 187 | } |
| 188 | |
| 189 | if (read_bitrate / st->codec->channels < 8 || |
| 190 | read_bitrate / st->codec->channels > 48) { |
| 191 | av_log(s, AV_LOG_ERROR, "Invalid bitrate per channel %d\n", |
| 192 | read_bitrate / st->codec->channels); |
| 193 | return AVERROR_INVALIDDATA; |
| 194 | } |
| 195 | |
| 196 | switch (((st->codec->sample_rate/1000) << 8) + |
| 197 | read_bitrate/st->codec->channels) { |
| 198 | case (11<<8) + 8 : |
| 199 | case (8 <<8) + 8 : |
| 200 | case (11<<8) + 10: |
| 201 | case (22<<8) + 32: |
| 202 | size = 512; |
| 203 | break; |
| 204 | case (16<<8) + 16: |
| 205 | case (22<<8) + 20: |
| 206 | case (22<<8) + 24: |
| 207 | size = 1024; |
| 208 | break; |
| 209 | case (44<<8) + 40: |
| 210 | case (44<<8) + 48: |
| 211 | size = 2048; |
| 212 | break; |
| 213 | default: |
| 214 | av_log(s, AV_LOG_ERROR, "Mode not suported: %d Hz, %d kb/s.\n", |
| 215 | st->codec->sample_rate, st->codec->bit_rate); |
| 216 | return -1; |
| 217 | } |
| 218 | c->frame_bit_len = st->codec->bit_rate*size/st->codec->sample_rate; |
| 219 | avpriv_set_pts_info(st, 64, size, st->codec->sample_rate); |
| 220 | |
| 221 | /* put first 12 bytes of COMM chunk in extradata */ |
| 222 | if (ff_alloc_extradata(st->codec, 12)) |
| 223 | return AVERROR(ENOMEM); |
| 224 | memcpy(st->codec->extradata, comm_chunk, 12); |
| 225 | |
| 226 | ff_metadata_conv_ctx(s, NULL, vqf_metadata_conv); |
| 227 | |
| 228 | return 0; |
| 229 | } |
| 230 | |
| 231 | static int vqf_read_packet(AVFormatContext *s, AVPacket *pkt) |
| 232 | { |
| 233 | VqfContext *c = s->priv_data; |
| 234 | int ret; |
| 235 | int size = (c->frame_bit_len - c->remaining_bits + 7)>>3; |
| 236 | |
| 237 | if (av_new_packet(pkt, size+2) < 0) |
| 238 | return AVERROR(EIO); |
| 239 | |
| 240 | pkt->pos = avio_tell(s->pb); |
| 241 | pkt->stream_index = 0; |
| 242 | pkt->duration = 1; |
| 243 | |
| 244 | pkt->data[0] = 8 - c->remaining_bits; // Number of bits to skip |
| 245 | pkt->data[1] = c->last_frame_bits; |
| 246 | ret = avio_read(s->pb, pkt->data+2, size); |
| 247 | |
| 248 | if (ret != size) { |
| 249 | av_free_packet(pkt); |
| 250 | return AVERROR(EIO); |
| 251 | } |
| 252 | |
| 253 | c->last_frame_bits = pkt->data[size+1]; |
| 254 | c->remaining_bits = (size << 3) - c->frame_bit_len + c->remaining_bits; |
| 255 | |
| 256 | return size+2; |
| 257 | } |
| 258 | |
| 259 | static int vqf_read_seek(AVFormatContext *s, |
| 260 | int stream_index, int64_t timestamp, int flags) |
| 261 | { |
| 262 | VqfContext *c = s->priv_data; |
| 263 | AVStream *st; |
| 264 | int ret; |
| 265 | int64_t pos; |
| 266 | |
| 267 | st = s->streams[stream_index]; |
| 268 | pos = av_rescale_rnd(timestamp * st->codec->bit_rate, |
| 269 | st->time_base.num, |
| 270 | st->time_base.den * (int64_t)c->frame_bit_len, |
| 271 | (flags & AVSEEK_FLAG_BACKWARD) ? |
| 272 | AV_ROUND_DOWN : AV_ROUND_UP); |
| 273 | pos *= c->frame_bit_len; |
| 274 | |
| 275 | st->cur_dts = av_rescale(pos, st->time_base.den, |
| 276 | st->codec->bit_rate * (int64_t)st->time_base.num); |
| 277 | |
| 278 | if ((ret = avio_seek(s->pb, ((pos-7) >> 3) + s->data_offset, SEEK_SET)) < 0) |
| 279 | return ret; |
| 280 | |
| 281 | c->remaining_bits = -7 - ((pos-7)&7); |
| 282 | return 0; |
| 283 | } |
| 284 | |
| 285 | AVInputFormat ff_vqf_demuxer = { |
| 286 | .name = "vqf", |
| 287 | .long_name = NULL_IF_CONFIG_SMALL("Nippon Telegraph and Telephone Corporation (NTT) TwinVQ"), |
| 288 | .priv_data_size = sizeof(VqfContext), |
| 289 | .read_probe = vqf_probe, |
| 290 | .read_header = vqf_read_header, |
| 291 | .read_packet = vqf_read_packet, |
| 292 | .read_seek = vqf_read_seek, |
| 293 | .extensions = "vqf,vql,vqe", |
| 294 | }; |