Libav 0.7.1
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00001 /* 00002 * VQF demuxer 00003 * Copyright (c) 2009 Vitor Sessak 00004 * 00005 * This file is part of Libav. 00006 * 00007 * Libav is free software; you can redistribute it and/or 00008 * modify it under the terms of the GNU Lesser General Public 00009 * License as published by the Free Software Foundation; either 00010 * version 2.1 of the License, or (at your option) any later version. 00011 * 00012 * Libav is distributed in the hope that it will be useful, 00013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00015 * Lesser General Public License for more details. 00016 * 00017 * You should have received a copy of the GNU Lesser General Public 00018 * License along with Libav; if not, write to the Free Software 00019 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00020 */ 00021 00022 #include "avformat.h" 00023 #include "libavutil/intreadwrite.h" 00024 #include "libavutil/dict.h" 00025 00026 typedef struct VqfContext { 00027 int frame_bit_len; 00028 uint8_t last_frame_bits; 00029 int remaining_bits; 00030 } VqfContext; 00031 00032 static int vqf_probe(AVProbeData *probe_packet) 00033 { 00034 if (AV_RL32(probe_packet->buf) != MKTAG('T','W','I','N')) 00035 return 0; 00036 00037 if (!memcmp(probe_packet->buf + 4, "97012000", 8)) 00038 return AVPROBE_SCORE_MAX; 00039 00040 if (!memcmp(probe_packet->buf + 4, "00052200", 8)) 00041 return AVPROBE_SCORE_MAX; 00042 00043 return AVPROBE_SCORE_MAX/2; 00044 } 00045 00046 static void add_metadata(AVFormatContext *s, const char *tag, 00047 unsigned int tag_len, unsigned int remaining) 00048 { 00049 int len = FFMIN(tag_len, remaining); 00050 char *buf; 00051 00052 if (len == UINT_MAX) 00053 return; 00054 00055 buf = av_malloc(len+1); 00056 if (!buf) 00057 return; 00058 avio_read(s->pb, buf, len); 00059 buf[len] = 0; 00060 av_dict_set(&s->metadata, tag, buf, AV_DICT_DONT_STRDUP_VAL); 00061 } 00062 00063 static int vqf_read_header(AVFormatContext *s, AVFormatParameters *ap) 00064 { 00065 VqfContext *c = s->priv_data; 00066 AVStream *st = av_new_stream(s, 0); 00067 int chunk_tag; 00068 int rate_flag = -1; 00069 int header_size; 00070 int read_bitrate = 0; 00071 int size; 00072 00073 if (!st) 00074 return AVERROR(ENOMEM); 00075 00076 avio_skip(s->pb, 12); 00077 00078 header_size = avio_rb32(s->pb); 00079 00080 st->codec->codec_type = AVMEDIA_TYPE_AUDIO; 00081 st->codec->codec_id = CODEC_ID_TWINVQ; 00082 st->start_time = 0; 00083 00084 do { 00085 int len; 00086 chunk_tag = avio_rl32(s->pb); 00087 00088 if (chunk_tag == MKTAG('D','A','T','A')) 00089 break; 00090 00091 len = avio_rb32(s->pb); 00092 00093 if ((unsigned) len > INT_MAX/2) { 00094 av_log(s, AV_LOG_ERROR, "Malformed header\n"); 00095 return -1; 00096 } 00097 00098 header_size -= 8; 00099 00100 switch(chunk_tag){ 00101 case MKTAG('C','O','M','M'): 00102 st->codec->channels = avio_rb32(s->pb) + 1; 00103 read_bitrate = avio_rb32(s->pb); 00104 rate_flag = avio_rb32(s->pb); 00105 avio_skip(s->pb, len-12); 00106 00107 st->codec->bit_rate = read_bitrate*1000; 00108 st->codec->bits_per_coded_sample = 16; 00109 break; 00110 case MKTAG('N','A','M','E'): 00111 add_metadata(s, "title" , len, header_size); 00112 break; 00113 case MKTAG('(','c',')',' '): 00114 add_metadata(s, "copyright", len, header_size); 00115 break; 00116 case MKTAG('A','U','T','H'): 00117 add_metadata(s, "author" , len, header_size); 00118 break; 00119 case MKTAG('A','L','B','M'): 00120 add_metadata(s, "album" , len, header_size); 00121 break; 00122 case MKTAG('T','R','C','K'): 00123 add_metadata(s, "track" , len, header_size); 00124 break; 00125 case MKTAG('C','O','M','T'): 00126 add_metadata(s, "comment" , len, header_size); 00127 break; 00128 case MKTAG('F','I','L','E'): 00129 add_metadata(s, "filename" , len, header_size); 00130 break; 00131 case MKTAG('D','S','I','Z'): 00132 add_metadata(s, "size" , len, header_size); 00133 break; 00134 case MKTAG('D','A','T','E'): 00135 add_metadata(s, "date" , len, header_size); 00136 break; 00137 case MKTAG('G','E','N','R'): 00138 add_metadata(s, "genre" , len, header_size); 00139 break; 00140 default: 00141 av_log(s, AV_LOG_ERROR, "Unknown chunk: %c%c%c%c\n", 00142 ((char*)&chunk_tag)[0], ((char*)&chunk_tag)[1], 00143 ((char*)&chunk_tag)[2], ((char*)&chunk_tag)[3]); 00144 avio_skip(s->pb, FFMIN(len, header_size)); 00145 break; 00146 } 00147 00148 header_size -= len; 00149 00150 } while (header_size >= 0); 00151 00152 switch (rate_flag) { 00153 case -1: 00154 av_log(s, AV_LOG_ERROR, "COMM tag not found!\n"); 00155 return -1; 00156 case 44: 00157 st->codec->sample_rate = 44100; 00158 break; 00159 case 22: 00160 st->codec->sample_rate = 22050; 00161 break; 00162 case 11: 00163 st->codec->sample_rate = 11025; 00164 break; 00165 default: 00166 st->codec->sample_rate = rate_flag*1000; 00167 break; 00168 } 00169 00170 switch (((st->codec->sample_rate/1000) << 8) + 00171 read_bitrate/st->codec->channels) { 00172 case (11<<8) + 8 : 00173 case (8 <<8) + 8 : 00174 case (11<<8) + 10: 00175 case (22<<8) + 32: 00176 size = 512; 00177 break; 00178 case (16<<8) + 16: 00179 case (22<<8) + 20: 00180 case (22<<8) + 24: 00181 size = 1024; 00182 break; 00183 case (44<<8) + 40: 00184 case (44<<8) + 48: 00185 size = 2048; 00186 break; 00187 default: 00188 av_log(s, AV_LOG_ERROR, "Mode not suported: %d Hz, %d kb/s.\n", 00189 st->codec->sample_rate, st->codec->bit_rate); 00190 return -1; 00191 } 00192 c->frame_bit_len = st->codec->bit_rate*size/st->codec->sample_rate; 00193 av_set_pts_info(st, 64, 1, st->codec->sample_rate); 00194 00195 return 0; 00196 } 00197 00198 static int vqf_read_packet(AVFormatContext *s, AVPacket *pkt) 00199 { 00200 VqfContext *c = s->priv_data; 00201 int ret; 00202 int size = (c->frame_bit_len - c->remaining_bits + 7)>>3; 00203 00204 pkt->pos = avio_tell(s->pb); 00205 pkt->stream_index = 0; 00206 00207 if (av_new_packet(pkt, size+2) < 0) 00208 return AVERROR(EIO); 00209 00210 pkt->data[0] = 8 - c->remaining_bits; // Number of bits to skip 00211 pkt->data[1] = c->last_frame_bits; 00212 ret = avio_read(s->pb, pkt->data+2, size); 00213 00214 if (ret<=0) { 00215 av_free_packet(pkt); 00216 return AVERROR(EIO); 00217 } 00218 00219 c->last_frame_bits = pkt->data[size+1]; 00220 c->remaining_bits = (size << 3) - c->frame_bit_len + c->remaining_bits; 00221 00222 return size+2; 00223 } 00224 00225 static int vqf_read_seek(AVFormatContext *s, 00226 int stream_index, int64_t timestamp, int flags) 00227 { 00228 VqfContext *c = s->priv_data; 00229 AVStream *st; 00230 int ret; 00231 int64_t pos; 00232 00233 st = s->streams[stream_index]; 00234 pos = av_rescale_rnd(timestamp * st->codec->bit_rate, 00235 st->time_base.num, 00236 st->time_base.den * (int64_t)c->frame_bit_len, 00237 (flags & AVSEEK_FLAG_BACKWARD) ? 00238 AV_ROUND_DOWN : AV_ROUND_UP); 00239 pos *= c->frame_bit_len; 00240 00241 st->cur_dts = av_rescale(pos, st->time_base.den, 00242 st->codec->bit_rate * (int64_t)st->time_base.num); 00243 00244 if ((ret = avio_seek(s->pb, ((pos-7) >> 3) + s->data_offset, SEEK_SET)) < 0) 00245 return ret; 00246 00247 c->remaining_bits = -7 - ((pos-7)&7); 00248 return 0; 00249 } 00250 00251 AVInputFormat ff_vqf_demuxer = { 00252 "vqf", 00253 NULL_IF_CONFIG_SMALL("Nippon Telegraph and Telephone Corporation (NTT) TwinVQ"), 00254 sizeof(VqfContext), 00255 vqf_probe, 00256 vqf_read_header, 00257 vqf_read_packet, 00258 NULL, 00259 vqf_read_seek, 00260 .extensions = "vqf", 00261 };