1/* 2 * VQF demuxer 3 * Copyright (c) 2009 Vitor Sessak 4 * 5 * This file is part of Libav. 6 * 7 * Libav 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 * Libav 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 Libav; 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 29typedef struct VqfContext { 30 int frame_bit_len; 31 uint8_t last_frame_bits; 32 int remaining_bits; 33} VqfContext; 34 35static 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 return AVPROBE_SCORE_MAX/2; 47} 48 49static void add_metadata(AVFormatContext *s, uint32_t tag, 50 unsigned int tag_len, unsigned int remaining) 51{ 52 int len = FFMIN(tag_len, remaining); 53 char *buf, key[5] = {0}; 54 55 if (len == UINT_MAX) 56 return; 57 58 buf = av_malloc(len+1); 59 if (!buf) 60 return; 61 avio_read(s->pb, buf, len); 62 buf[len] = 0; 63 AV_WL32(key, tag); 64 av_dict_set(&s->metadata, key, buf, AV_DICT_DONT_STRDUP_VAL); 65} 66 67static const AVMetadataConv vqf_metadata_conv[] = { 68 { "(c) ", "copyright" }, 69 { "ARNG", "arranger" }, 70 { "AUTH", "author" }, 71 { "BAND", "band" }, 72 { "CDCT", "conductor" }, 73 { "COMT", "comment" }, 74 { "FILE", "filename" }, 75 { "GENR", "genre" }, 76 { "LABL", "publisher" }, 77 { "MUSC", "composer" }, 78 { "NAME", "title" }, 79 { "NOTE", "note" }, 80 { "PROD", "producer" }, 81 { "PRSN", "personnel" }, 82 { "REMX", "remixer" }, 83 { "SING", "singer" }, 84 { "TRCK", "track" }, 85 { "WORD", "words" }, 86 { 0 }, 87}; 88 89static int vqf_read_header(AVFormatContext *s, AVFormatParameters *ap) 90{ 91 VqfContext *c = s->priv_data; 92 AVStream *st = avformat_new_stream(s, NULL); 93 int chunk_tag; 94 int rate_flag = -1; 95 int header_size; 96 int read_bitrate = 0; 97 int size; 98 uint8_t comm_chunk[12]; 99 100 if (!st) 101 return AVERROR(ENOMEM); 102 103 avio_skip(s->pb, 12); 104 105 header_size = avio_rb32(s->pb); 106 107 st->codec->codec_type = AVMEDIA_TYPE_AUDIO; 108 st->codec->codec_id = CODEC_ID_TWINVQ; 109 st->start_time = 0; 110 111 do { 112 int len; 113 chunk_tag = avio_rl32(s->pb); 114 115 if (chunk_tag == MKTAG('D','A','T','A')) 116 break; 117 118 len = avio_rb32(s->pb); 119 120 if ((unsigned) len > INT_MAX/2) { 121 av_log(s, AV_LOG_ERROR, "Malformed header\n"); 122 return -1; 123 } 124 125 header_size -= 8; 126 127 switch(chunk_tag){ 128 case MKTAG('C','O','M','M'): 129 avio_read(s->pb, comm_chunk, 12); 130 st->codec->channels = AV_RB32(comm_chunk ) + 1; 131 read_bitrate = AV_RB32(comm_chunk + 4); 132 rate_flag = AV_RB32(comm_chunk + 8); 133 avio_skip(s->pb, len-12); 134 135 st->codec->bit_rate = read_bitrate*1000; 136 break; 137 case MKTAG('D','S','I','Z'): // size of compressed data 138 { 139 char buf[8] = {0}; 140 int size = avio_rb32(s->pb); 141 142 snprintf(buf, sizeof(buf), "%d", size); 143 av_dict_set(&s->metadata, "size", buf, 0); 144 } 145 break; 146 case MKTAG('Y','E','A','R'): // recording date 147 case MKTAG('E','N','C','D'): // compression date 148 case MKTAG('E','X','T','R'): // reserved 149 case MKTAG('_','Y','M','H'): // reserved 150 case MKTAG('_','N','T','T'): // reserved 151 case MKTAG('_','I','D','3'): // reserved for ID3 tags 152 avio_skip(s->pb, FFMIN(len, header_size)); 153 break; 154 default: 155 add_metadata(s, chunk_tag, len, header_size); 156 break; 157 } 158 159 header_size -= len; 160 161 } while (header_size >= 0); 162 163 switch (rate_flag) { 164 case -1: 165 av_log(s, AV_LOG_ERROR, "COMM tag not found!\n"); 166 return -1; 167 case 44: 168 st->codec->sample_rate = 44100; 169 break; 170 case 22: 171 st->codec->sample_rate = 22050; 172 break; 173 case 11: 174 st->codec->sample_rate = 11025; 175 break; 176 default: 177 st->codec->sample_rate = rate_flag*1000; 178 break; 179 } 180 181 switch (((st->codec->sample_rate/1000) << 8) + 182 read_bitrate/st->codec->channels) { 183 case (11<<8) + 8 : 184 case (8 <<8) + 8 : 185 case (11<<8) + 10: 186 case (22<<8) + 32: 187 size = 512; 188 break; 189 case (16<<8) + 16: 190 case (22<<8) + 20: 191 case (22<<8) + 24: 192 size = 1024; 193 break; 194 case (44<<8) + 40: 195 case (44<<8) + 48: 196 size = 2048; 197 break; 198 default: 199 av_log(s, AV_LOG_ERROR, "Mode not suported: %d Hz, %d kb/s.\n", 200 st->codec->sample_rate, st->codec->bit_rate); 201 return -1; 202 } 203 c->frame_bit_len = st->codec->bit_rate*size/st->codec->sample_rate; 204 avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); 205 206 /* put first 12 bytes of COMM chunk in extradata */ 207 if (!(st->codec->extradata = av_malloc(12 + FF_INPUT_BUFFER_PADDING_SIZE))) 208 return AVERROR(ENOMEM); 209 st->codec->extradata_size = 12; 210 memcpy(st->codec->extradata, comm_chunk, 12); 211 212 ff_metadata_conv_ctx(s, NULL, vqf_metadata_conv); 213 214 return 0; 215} 216 217static int vqf_read_packet(AVFormatContext *s, AVPacket *pkt) 218{ 219 VqfContext *c = s->priv_data; 220 int ret; 221 int size = (c->frame_bit_len - c->remaining_bits + 7)>>3; 222 223 pkt->pos = avio_tell(s->pb); 224 pkt->stream_index = 0; 225 226 if (av_new_packet(pkt, size+2) < 0) 227 return AVERROR(EIO); 228 229 pkt->data[0] = 8 - c->remaining_bits; // Number of bits to skip 230 pkt->data[1] = c->last_frame_bits; 231 ret = avio_read(s->pb, pkt->data+2, size); 232 233 if (ret<=0) { 234 av_free_packet(pkt); 235 return AVERROR(EIO); 236 } 237 238 c->last_frame_bits = pkt->data[size+1]; 239 c->remaining_bits = (size << 3) - c->frame_bit_len + c->remaining_bits; 240 241 return size+2; 242} 243 244static int vqf_read_seek(AVFormatContext *s, 245 int stream_index, int64_t timestamp, int flags) 246{ 247 VqfContext *c = s->priv_data; 248 AVStream *st; 249 int ret; 250 int64_t pos; 251 252 st = s->streams[stream_index]; 253 pos = av_rescale_rnd(timestamp * st->codec->bit_rate, 254 st->time_base.num, 255 st->time_base.den * (int64_t)c->frame_bit_len, 256 (flags & AVSEEK_FLAG_BACKWARD) ? 257 AV_ROUND_DOWN : AV_ROUND_UP); 258 pos *= c->frame_bit_len; 259 260 st->cur_dts = av_rescale(pos, st->time_base.den, 261 st->codec->bit_rate * (int64_t)st->time_base.num); 262 263 if ((ret = avio_seek(s->pb, ((pos-7) >> 3) + s->data_offset, SEEK_SET)) < 0) 264 return ret; 265 266 c->remaining_bits = -7 - ((pos-7)&7); 267 return 0; 268} 269 270AVInputFormat ff_vqf_demuxer = { 271 .name = "vqf", 272 .long_name = NULL_IF_CONFIG_SMALL("Nippon Telegraph and Telephone Corporation (NTT) TwinVQ"), 273 .priv_data_size = sizeof(VqfContext), 274 .read_probe = vqf_probe, 275 .read_header = vqf_read_header, 276 .read_packet = vqf_read_packet, 277 .read_seek = vqf_read_seek, 278 .extensions = "vqf,vql,vqe", 279}; 280