| 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 | |
| 33 | typedef 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 | |
| 43 | static 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 | |
| 72 | static 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 (avio_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 | |
| 118 | static 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 | |
| 244 | static 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 | |
| 251 | restart: |
| 252 | |
| 253 | if (avio_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 (avio_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 | |
| 299 | fail: |
| 300 | if (ret < 0) |
| 301 | av_free_packet(pkt); |
| 302 | return ret; |
| 303 | } |
| 304 | |
| 305 | AVInputFormat 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 | }; |