1/* 2 * Vivo stream demuxer 3 * Copyright (c) 2009 Daniel Verkamp <daniel at drv.nu> 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/** 23 * @file 24 * @brief Vivo stream demuxer 25 * @author Daniel Verkamp <daniel at drv.nu> 26 * @sa http://wiki.multimedia.cx/index.php?title=Vivo 27 */ 28 29#include "libavutil/parseutils.h" 30#include "avformat.h" 31#include "internal.h" 32 33typedef struct VivoContext { 34 int version; 35 36 int type; 37 int sequence; 38 int length; 39 40 uint8_t text[1024 + 1]; 41} VivoContext; 42 43static int vivo_probe(AVProbeData *p) 44{ 45 const unsigned char *buf = p->buf; 46 unsigned c, length = 0; 47 48 // stream must start with packet of type 0 and sequence number 0 49 if (*buf++ != 0) 50 return 0; 51 52 // read at most 2 bytes of coded length 53 c = *buf++; 54 length = c & 0x7F; 55 if (c & 0x80) { 56 c = *buf++; 57 length = (length << 7) | (c & 0x7F); 58 } 59 if (c & 0x80 || length > 1024 || length < 21) 60 return 0; 61 62 if (memcmp(buf, "\r\nVersion:Vivo/", 15)) 63 return 0; 64 buf += 15; 65 66 if (*buf < '0' && *buf > '2') 67 return 0; 68 69 return AVPROBE_SCORE_MAX; 70} 71 72static int vivo_get_packet_header(AVFormatContext *s) 73{ 74 VivoContext *vivo = s->priv_data; 75 AVIOContext *pb = s->pb; 76 unsigned c, get_length = 0; 77 78 if (url_feof(pb)) 79 return AVERROR_EOF; 80 81 c = avio_r8(pb); 82 if (c == 0x82) { 83 get_length = 1; 84 c = avio_r8(pb); 85 } 86 87 vivo->type = c >> 4; 88 vivo->sequence = c & 0xF; 89 90 switch (vivo->type) { 91 case 0: get_length = 1; break; 92 case 1: vivo->length = 128; break; 93 case 2: get_length = 1; break; 94 case 3: vivo->length = 40; break; 95 case 4: vivo->length = 24; break; 96 default: 97 av_log(s, AV_LOG_ERROR, "unknown packet type %d\n", vivo->type); 98 return AVERROR_INVALIDDATA; 99 } 100 101 if (get_length) { 102 c = avio_r8(pb); 103 vivo->length = c & 0x7F; 104 if (c & 0x80) { 105 c = avio_r8(pb); 106 vivo->length = (vivo->length << 7) | (c & 0x7F); 107 108 if (c & 0x80) { 109 av_log(s, AV_LOG_ERROR, "coded length is more than two bytes\n"); 110 return AVERROR_INVALIDDATA; 111 } 112 } 113 } 114 115 return 0; 116} 117 118static int vivo_read_header(AVFormatContext *s) 119{ 120 VivoContext *vivo = s->priv_data; 121 AVRational fps = { 1, 25}; 122 AVStream *ast, *vst; 123 unsigned char *line, *line_end, *key, *value; 124 long value_int; 125 int ret, value_used; 126 int64_t duration = 0; 127 char *end_value; 128 129 vst = avformat_new_stream(s, NULL); 130 ast = avformat_new_stream(s, NULL); 131 if (!ast || !vst) 132 return AVERROR(ENOMEM); 133 134 ast->codec->sample_rate = 8000; 135 136 while (1) { 137 if ((ret = vivo_get_packet_header(s)) < 0) 138 return ret; 139 140 // done reading all text header packets? 141 if (vivo->sequence || vivo->type) 142 break; 143 144 if (vivo->length <= 1024) { 145 avio_read(s->pb, vivo->text, vivo->length); 146 vivo->text[vivo->length] = 0; 147 } else { 148 av_log(s, AV_LOG_WARNING, "too big header, skipping\n"); 149 avio_skip(s->pb, vivo->length); 150 continue; 151 } 152 153 line = vivo->text; 154 while (*line) { 155 line_end = strstr(line, "\r\n"); 156 if (!line_end) 157 break; 158 159 *line_end = 0; 160 key = line; 161 line = line_end + 2; // skip \r\n 162 163 if (line_end == key) // skip blank lines 164 continue; 165 166 value = strchr(key, ':'); 167 if (!value) { 168 av_log(s, AV_LOG_WARNING, "missing colon in key:value pair '%s'\n", 169 value); 170 continue; 171 } 172 173 *value++ = 0; 174 175 av_log(s, AV_LOG_DEBUG, "header: '%s' = '%s'\n", key, value); 176 177 value_int = strtol(value, &end_value, 10); 178 value_used = 0; 179 if (*end_value == 0) { // valid integer 180 av_log(s, AV_LOG_DEBUG, "got a valid integer (%ld)\n", value_int); 181 value_used = 1; 182 if (!strcmp(key, "Duration")) { 183 duration = value_int; 184 } else if (!strcmp(key, "Width")) { 185 vst->codec->width = value_int; 186 } else if (!strcmp(key, "Height")) { 187 vst->codec->height = value_int; 188 } else if (!strcmp(key, "TimeUnitNumerator")) { 189 fps.num = value_int / 1000; 190 } else if (!strcmp(key, "TimeUnitDenominator")) { 191 fps.den = value_int; 192 } else if (!strcmp(key, "SamplingFrequency")) { 193 ast->codec->sample_rate = value_int; 194 } else if (!strcmp(key, "NominalBitrate")) { 195 } else if (!strcmp(key, "Length")) { 196 // size of file 197 } else { 198 value_used = 0; 199 } 200 } 201 202 if (!strcmp(key, "Version")) { 203 if (sscanf(value, "Vivo/%d.", &vivo->version) != 1) 204 return AVERROR_INVALIDDATA; 205 value_used = 1; 206 } else if (!strcmp(key, "FPS")) { 207 AVRational tmp; 208 209 value_used = 1; 210 if (!av_parse_ratio(&tmp, value, 10000, AV_LOG_WARNING, s)) 211 fps = av_inv_q(tmp); 212 } 213 214 if (!value_used) 215 av_dict_set(&s->metadata, key, value, 0); 216 } 217 } 218 219 avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate); 220 avpriv_set_pts_info(vst, 64, fps.num, fps.den); 221 if (duration) 222 s->duration = av_rescale(duration, 1000, 1); 223 224 vst->start_time = 0; 225 vst->codec->codec_tag = 0; 226 vst->codec->codec_type = AVMEDIA_TYPE_VIDEO; 227 228 if (vivo->version == 1) { 229 vst->codec->codec_id = AV_CODEC_ID_H263; 230 ast->codec->codec_id = AV_CODEC_ID_G723_1; 231 ast->codec->bits_per_coded_sample = 8; 232 ast->codec->block_align = 24; 233 ast->codec->bit_rate = 6400; 234 } 235 236 ast->start_time = 0; 237 ast->codec->codec_tag = 0; 238 ast->codec->codec_type = AVMEDIA_TYPE_AUDIO; 239 ast->codec->channels = 1; 240 241 return 0; 242} 243 244static int vivo_read_packet(AVFormatContext *s, AVPacket *pkt) 245{ 246 VivoContext *vivo = s->priv_data; 247 AVIOContext *pb = s->pb; 248 unsigned old_sequence = vivo->sequence, old_type = vivo->type; 249 int stream_index, ret = 0; 250 251restart: 252 253 if (url_feof(pb)) 254 return AVERROR_EOF; 255 256 switch (vivo->type) { 257 case 0: 258 avio_skip(pb, vivo->length); 259 if ((ret = vivo_get_packet_header(s)) < 0) 260 return ret; 261 goto restart; 262 case 1: 263 case 2: // video 264 stream_index = 0; 265 break; 266 case 3: 267 case 4: // audio 268 stream_index = 1; 269 break; 270 default: 271 av_log(s, AV_LOG_ERROR, "unknown packet type %d\n", vivo->type); 272 return AVERROR_INVALIDDATA; 273 } 274 275 if ((ret = av_get_packet(pb, pkt, vivo->length)) < 0) 276 goto fail; 277 278 // get next packet header 279 if ((ret = vivo_get_packet_header(s)) < 0) 280 goto fail; 281 282 while (vivo->sequence == old_sequence && 283 (((vivo->type - 1) >> 1) == ((old_type - 1) >> 1))) { 284 if (url_feof(pb)) { 285 ret = AVERROR_EOF; 286 break; 287 } 288 289 if ((ret = av_append_packet(pb, pkt, vivo->length)) < 0) 290 break; 291 292 // get next packet header 293 if ((ret = vivo_get_packet_header(s)) < 0) 294 break; 295 } 296 297 pkt->stream_index = stream_index; 298 299fail: 300 if (ret < 0) 301 av_free_packet(pkt); 302 return ret; 303} 304 305AVInputFormat ff_vivo_demuxer = { 306 .name = "vivo", 307 .long_name = NULL_IF_CONFIG_SMALL("Vivo"), 308 .priv_data_size = sizeof(VivoContext), 309 .read_probe = vivo_probe, 310 .read_header = vivo_read_header, 311 .read_packet = vivo_read_packet, 312 .extensions = "viv", 313}; 314