libavformat/rtmppkt.c

   1 /*
   2  * RTMP input format
   3  * Copyright (c) 2009 Konstantin Shishkov
   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 "libavcodec/bytestream.h"
  23 #include "libavutil/avstring.h"
  24 #include "libavutil/intfloat.h"
  25 #include "avformat.h"
  26
  27 #include "rtmppkt.h"
  28 #include "flv.h"
  29 #include "url.h"
  30
  31 void ff_amf_write_bool(uint8_t **dst, int val)
  32 {
  33     bytestream_put_byte(dst, AMF_DATA_TYPE_BOOL);
  34     bytestream_put_byte(dst, val);
  35 }
  36
  37 void ff_amf_write_number(uint8_t **dst, double val)
  38 {
  39     bytestream_put_byte(dst, AMF_DATA_TYPE_NUMBER);
  40     bytestream_put_be64(dst, av_double2int(val));
  41 }
  42
  43 void ff_amf_write_string(uint8_t **dst, const char *str)
  44 {
  45     bytestream_put_byte(dst, AMF_DATA_TYPE_STRING);
  46     bytestream_put_be16(dst, strlen(str));
  47     bytestream_put_buffer(dst, str, strlen(str));
  48 }
  49
  50 void ff_amf_write_string2(uint8_t **dst, const char *str1, const char *str2)
  51 {
  52     int len1 = 0, len2 = 0;
  53     if (str1)
  54         len1 = strlen(str1);
  55     if (str2)
  56         len2 = strlen(str2);
  57     bytestream_put_byte(dst, AMF_DATA_TYPE_STRING);
  58     bytestream_put_be16(dst, len1 + len2);
  59     bytestream_put_buffer(dst, str1, len1);
  60     bytestream_put_buffer(dst, str2, len2);
  61 }
  62
  63 void ff_amf_write_null(uint8_t **dst)
  64 {
  65     bytestream_put_byte(dst, AMF_DATA_TYPE_NULL);
  66 }
  67
  68 void ff_amf_write_object_start(uint8_t **dst)
  69 {
  70     bytestream_put_byte(dst, AMF_DATA_TYPE_OBJECT);
  71 }
  72
  73 void ff_amf_write_field_name(uint8_t **dst, const char *str)
  74 {
  75     bytestream_put_be16(dst, strlen(str));
  76     bytestream_put_buffer(dst, str, strlen(str));
  77 }
  78
  79 void ff_amf_write_object_end(uint8_t **dst)
  80 {
  81     /* first two bytes are field name length = 0,
  82      * AMF object should end with it and end marker
  83      */
  84     bytestream_put_be24(dst, AMF_DATA_TYPE_OBJECT_END);
  85 }
  86
  87 int ff_amf_read_number(GetByteContext *bc, double *val)
  88 {
  89     uint64_t read;
  90     if (bytestream2_get_byte(bc) != AMF_DATA_TYPE_NUMBER)
  91         return AVERROR_INVALIDDATA;
  92     read = bytestream2_get_be64(bc);
  93     *val = av_int2double(read);
  94     return 0;
  95 }
  96
  97 int ff_amf_get_string(GetByteContext *bc, uint8_t *str,
  98                       int strsize, int *length)
  99 {
 100     int stringlen = 0;
 101     int readsize;
 102     stringlen = bytestream2_get_be16(bc);
 103     if (stringlen + 1 > strsize)
 104         return AVERROR(EINVAL);
 105     readsize = bytestream2_get_buffer(bc, str, stringlen);
 106     if (readsize != stringlen) {
 107         av_log(NULL, AV_LOG_WARNING,
 108                "Unable to read as many bytes as AMF string signaled\n");
 109     }
 110     str[readsize] = '\0';
 111     *length = FFMIN(stringlen, readsize);
 112     return 0;
 113 }
 114
 115 int ff_amf_read_string(GetByteContext *bc, uint8_t *str,
 116                        int strsize, int *length)
 117 {
 118     if (bytestream2_get_byte(bc) != AMF_DATA_TYPE_STRING)
 119         return AVERROR_INVALIDDATA;
 120     return ff_amf_get_string(bc, str, strsize, length);
 121 }
 122
 123 int ff_amf_read_null(GetByteContext *bc)
 124 {
 125     if (bytestream2_get_byte(bc) != AMF_DATA_TYPE_NULL)
 126         return AVERROR_INVALIDDATA;
 127     return 0;
 128 }
 129
 130 int ff_rtmp_check_alloc_array(RTMPPacket **prev_pkt, int *nb_prev_pkt,
 131                               int channel)
 132 {
 133     int nb_alloc;
 134     RTMPPacket *ptr;
 135     if (channel < *nb_prev_pkt)
 136         return 0;
 137
 138     nb_alloc = channel + 16;
 139     // This can't use the av_reallocp family of functions, since we
 140     // would need to free each element in the array before the array
 141     // itself is freed.
 142     ptr = av_realloc_array(*prev_pkt, nb_alloc, sizeof(**prev_pkt));
 143     if (!ptr)
 144         return AVERROR(ENOMEM);
 145     memset(ptr + *nb_prev_pkt, 0, (nb_alloc - *nb_prev_pkt) * sizeof(*ptr));
 146     *prev_pkt = ptr;
 147     *nb_prev_pkt = nb_alloc;
 148     return 0;
 149 }
 150
 151 int ff_rtmp_packet_read(URLContext *h, RTMPPacket *p,
 152                         int chunk_size, RTMPPacket **prev_pkt, int *nb_prev_pkt)
 153 {
 154     uint8_t hdr;
 155
 156     if (ffurl_read(h, &hdr, 1) != 1)
 157         return AVERROR(EIO);
 158
 159     return ff_rtmp_packet_read_internal(h, p, chunk_size, prev_pkt,
 160                                         nb_prev_pkt, hdr);
 161 }
 162
 163 static int rtmp_packet_read_one_chunk(URLContext *h, RTMPPacket *p,
 164                                       int chunk_size, RTMPPacket **prev_pkt_ptr,
 165                                       int *nb_prev_pkt, uint8_t hdr)
 166 {
 167
 168     uint8_t buf[16];
 169     int channel_id, timestamp, size;
 170     uint32_t ts_field; // non-extended timestamp or delta field
 171     uint32_t extra = 0;
 172     enum RTMPPacketType type;
 173     int written = 0;
 174     int ret, toread;
 175     RTMPPacket *prev_pkt;
 176
 177     written++;
 178     channel_id = hdr & 0x3F;
 179
 180     if (channel_id < 2) { //special case for channel number >= 64
 181         buf[1] = 0;
 182         if (ffurl_read_complete(h, buf, channel_id + 1) != channel_id + 1)
 183             return AVERROR(EIO);
 184         written += channel_id + 1;
 185         channel_id = AV_RL16(buf) + 64;
 186     }
 187     if ((ret = ff_rtmp_check_alloc_array(prev_pkt_ptr, nb_prev_pkt,
 188                                          channel_id)) < 0)
 189         return ret;
 190     prev_pkt = *prev_pkt_ptr;
 191     size  = prev_pkt[channel_id].size;
 192     type  = prev_pkt[channel_id].type;
 193     extra = prev_pkt[channel_id].extra;
 194
 195     hdr >>= 6; // header size indicator
 196     if (hdr == RTMP_PS_ONEBYTE) {
 197         ts_field = prev_pkt[channel_id].ts_field;
 198     } else {
 199         if (ffurl_read_complete(h, buf, 3) != 3)
 200             return AVERROR(EIO);
 201         written += 3;
 202         ts_field = AV_RB24(buf);
 203         if (hdr != RTMP_PS_FOURBYTES) {
 204             if (ffurl_read_complete(h, buf, 3) != 3)
 205                 return AVERROR(EIO);
 206             written += 3;
 207             size = AV_RB24(buf);
 208             if (ffurl_read_complete(h, buf, 1) != 1)
 209                 return AVERROR(EIO);
 210             written++;
 211             type = buf[0];
 212             if (hdr == RTMP_PS_TWELVEBYTES) {
 213                 if (ffurl_read_complete(h, buf, 4) != 4)
 214                     return AVERROR(EIO);
 215                 written += 4;
 216                 extra = AV_RL32(buf);
 217             }
 218         }
 219     }
 220     if (ts_field == 0xFFFFFF) {
 221         if (ffurl_read_complete(h, buf, 4) != 4)
 222             return AVERROR(EIO);
 223         timestamp = AV_RB32(buf);
 224     } else {
 225         timestamp = ts_field;
 226     }
 227     if (hdr != RTMP_PS_TWELVEBYTES)
 228         timestamp += prev_pkt[channel_id].timestamp;
 229
 230     if (prev_pkt[channel_id].read && size != prev_pkt[channel_id].size) {
 231         av_log(h, AV_LOG_ERROR, "RTMP packet size mismatch %d != %d\n",
 232                                 size, prev_pkt[channel_id].size);
 233         ff_rtmp_packet_destroy(&prev_pkt[channel_id]);
 234         prev_pkt[channel_id].read = 0;
 235         return AVERROR_INVALIDDATA;
 236     }
 237
 238     if (!prev_pkt[channel_id].read) {
 239         if ((ret = ff_rtmp_packet_create(p, channel_id, type, timestamp,
 240                                          size)) < 0)
 241             return ret;
 242         p->read = written;
 243         p->offset = 0;
 244         prev_pkt[channel_id].ts_field   = ts_field;
 245         prev_pkt[channel_id].timestamp  = timestamp;
 246     } else {
 247         // previous packet in this channel hasn't completed reading
 248         RTMPPacket *prev = &prev_pkt[channel_id];
 249         p->data          = prev->data;
 250         p->size          = prev->size;
 251         p->channel_id    = prev->channel_id;
 252         p->type          = prev->type;
 253         p->ts_field      = prev->ts_field;
 254         p->extra         = prev->extra;
 255         p->offset        = prev->offset;
 256         p->read          = prev->read + written;
 257         p->timestamp     = prev->timestamp;
 258         prev->data       = NULL;
 259     }
 260     p->extra = extra;
 261     // save history
 262     prev_pkt[channel_id].channel_id = channel_id;
 263     prev_pkt[channel_id].type       = type;
 264     prev_pkt[channel_id].size       = size;
 265     prev_pkt[channel_id].extra      = extra;
 266     size = size - p->offset;
 267
 268     toread = FFMIN(size, chunk_size);
 269     if (ffurl_read_complete(h, p->data + p->offset, toread) != toread) {
 270         ff_rtmp_packet_destroy(p);
 271         return AVERROR(EIO);
 272     }
 273     size      -= toread;
 274     p->read   += toread;
 275     p->offset += toread;
 276
 277     if (size > 0) {
 278        RTMPPacket *prev = &prev_pkt[channel_id];
 279        prev->data = p->data;
 280        prev->read = p->read;
 281        prev->offset = p->offset;
 282        p->data      = NULL;
 283        return AVERROR(EAGAIN);
 284     }
 285
 286     prev_pkt[channel_id].read = 0; // read complete; reset if needed
 287     return p->read;
 288 }
 289
 290 int ff_rtmp_packet_read_internal(URLContext *h, RTMPPacket *p, int chunk_size,
 291                                  RTMPPacket **prev_pkt, int *nb_prev_pkt,
 292                                  uint8_t hdr)
 293 {
 294     while (1) {
 295         int ret = rtmp_packet_read_one_chunk(h, p, chunk_size, prev_pkt,
 296                                              nb_prev_pkt, hdr);
 297         if (ret > 0 || ret != AVERROR(EAGAIN))
 298             return ret;
 299
 300         if (ffurl_read(h, &hdr, 1) != 1)
 301             return AVERROR(EIO);
 302     }
 303 }
 304
 305 int ff_rtmp_packet_write(URLContext *h, RTMPPacket *pkt,
 306                          int chunk_size, RTMPPacket **prev_pkt_ptr,
 307                          int *nb_prev_pkt)
 308 {
 309     uint8_t pkt_hdr[16], *p = pkt_hdr;
 310     int mode = RTMP_PS_TWELVEBYTES;
 311     int off = 0;
 312     int written = 0;
 313     int ret;
 314     RTMPPacket *prev_pkt;
 315     int use_delta; // flag if using timestamp delta, not RTMP_PS_TWELVEBYTES
 316     uint32_t timestamp; // full 32-bit timestamp or delta value
 317
 318     if ((ret = ff_rtmp_check_alloc_array(prev_pkt_ptr, nb_prev_pkt,
 319                                          pkt->channel_id)) < 0)
 320         return ret;
 321     prev_pkt = *prev_pkt_ptr;
 322
 323     //if channel_id = 0, this is first presentation of prev_pkt, send full hdr.
 324     use_delta = prev_pkt[pkt->channel_id].channel_id &&
 325         pkt->extra == prev_pkt[pkt->channel_id].extra &&
 326         pkt->timestamp >= prev_pkt[pkt->channel_id].timestamp;
 327
 328     timestamp = pkt->timestamp;
 329     if (use_delta) {
 330         timestamp -= prev_pkt[pkt->channel_id].timestamp;
 331     }
 332     if (timestamp >= 0xFFFFFF) {
 333         pkt->ts_field = 0xFFFFFF;
 334     } else {
 335         pkt->ts_field = timestamp;
 336     }
 337
 338     if (use_delta) {
 339         if (pkt->type == prev_pkt[pkt->channel_id].type &&
 340             pkt->size == prev_pkt[pkt->channel_id].size) {
 341             mode = RTMP_PS_FOURBYTES;
 342             if (pkt->ts_field == prev_pkt[pkt->channel_id].ts_field)
 343                 mode = RTMP_PS_ONEBYTE;
 344         } else {
 345             mode = RTMP_PS_EIGHTBYTES;
 346         }
 347     }
 348
 349     if (pkt->channel_id < 64) {
 350         bytestream_put_byte(&p, pkt->channel_id | (mode << 6));
 351     } else if (pkt->channel_id < 64 + 256) {
 352         bytestream_put_byte(&p, 0               | (mode << 6));
 353         bytestream_put_byte(&p, pkt->channel_id - 64);
 354     } else {
 355         bytestream_put_byte(&p, 1               | (mode << 6));
 356         bytestream_put_le16(&p, pkt->channel_id - 64);
 357     }
 358     if (mode != RTMP_PS_ONEBYTE) {
 359         bytestream_put_be24(&p, pkt->ts_field);
 360         if (mode != RTMP_PS_FOURBYTES) {
 361             bytestream_put_be24(&p, pkt->size);
 362             bytestream_put_byte(&p, pkt->type);
 363             if (mode == RTMP_PS_TWELVEBYTES)
 364                 bytestream_put_le32(&p, pkt->extra);
 365         }
 366     }
 367     if (pkt->ts_field == 0xFFFFFF)
 368         bytestream_put_be32(&p, timestamp);
 369     // save history
 370     prev_pkt[pkt->channel_id].channel_id = pkt->channel_id;
 371     prev_pkt[pkt->channel_id].type       = pkt->type;
 372     prev_pkt[pkt->channel_id].size       = pkt->size;
 373     prev_pkt[pkt->channel_id].timestamp  = pkt->timestamp;
 374     prev_pkt[pkt->channel_id].ts_field   = pkt->ts_field;
 375     prev_pkt[pkt->channel_id].extra      = pkt->extra;
 376
 377     // FIXME:
 378     // Writing packets is currently not optimized to minimize system calls.
 379     // Since system calls flush on exit which we cannot change in a system-independant way.
 380     // We should fix this behavior and by writing packets in a single or in as few as possible system calls.
 381     // Protocols like TCP and RTMP should benefit from this when enabling TCP_NODELAY.
 382
 383     if ((ret = ffurl_write(h, pkt_hdr, p - pkt_hdr)) < 0)
 384         return ret;
 385     written = p - pkt_hdr + pkt->size;
 386     while (off < pkt->size) {
 387         int towrite = FFMIN(chunk_size, pkt->size - off);
 388         if ((ret = ffurl_write(h, pkt->data + off, towrite)) < 0)
 389             return ret;
 390         off += towrite;
 391         if (off < pkt->size) {
 392             uint8_t marker = 0xC0 | pkt->channel_id;
 393             if ((ret = ffurl_write(h, &marker, 1)) < 0)
 394                 return ret;
 395             written++;
 396             if (pkt->ts_field == 0xFFFFFF) {
 397                 uint8_t ts_header[4];
 398                 AV_WB32(ts_header, timestamp);
 399                 if ((ret = ffurl_write(h, ts_header, 4)) < 0)
 400                     return ret;
 401                 written += 4;
 402             }
 403         }
 404     }
 405     return written;
 406 }
 407
 408 int ff_rtmp_packet_create(RTMPPacket *pkt, int channel_id, RTMPPacketType type,
 409                           int timestamp, int size)
 410 {
 411     if (size) {
 412         pkt->data = av_realloc(NULL, size);
 413         if (!pkt->data)
 414             return AVERROR(ENOMEM);
 415     }
 416     pkt->size       = size;
 417     pkt->channel_id = channel_id;
 418     pkt->type       = type;
 419     pkt->timestamp  = timestamp;
 420     pkt->extra      = 0;
 421     pkt->ts_field   = 0;
 422
 423     return 0;
 424 }
 425
 426 void ff_rtmp_packet_destroy(RTMPPacket *pkt)
 427 {
 428     if (!pkt)
 429         return;
 430     av_freep(&pkt->data);
 431     pkt->size = 0;
 432 }
 433
 434 static int amf_tag_skip(GetByteContext *gb)
 435 {
 436     AMFDataType type;
 437     unsigned nb   = -1;
 438     int parse_key = 1;
 439
 440     if (bytestream2_get_bytes_left(gb) < 1)
 441         return -1;
 442
 443     type = bytestream2_get_byte(gb);
 444     switch (type) {
 445     case AMF_DATA_TYPE_NUMBER:
 446         bytestream2_get_be64(gb);
 447         return 0;
 448     case AMF_DATA_TYPE_BOOL:
 449         bytestream2_get_byte(gb);
 450         return 0;
 451     case AMF_DATA_TYPE_STRING:
 452         bytestream2_skip(gb, bytestream2_get_be16(gb));
 453         return 0;
 454     case AMF_DATA_TYPE_LONG_STRING:
 455         bytestream2_skip(gb, bytestream2_get_be32(gb));
 456         return 0;
 457     case AMF_DATA_TYPE_NULL:
 458         return 0;
 459     case AMF_DATA_TYPE_DATE:
 460         bytestream2_skip(gb, 10);
 461         return 0;
 462     case AMF_DATA_TYPE_ARRAY:
 463         parse_key = 0;
 464     case AMF_DATA_TYPE_MIXEDARRAY:
 465         nb = bytestream2_get_be32(gb);
 466     case AMF_DATA_TYPE_OBJECT:
 467         while (nb-- > 0 || type != AMF_DATA_TYPE_ARRAY) {
 468             int t;
 469             if (parse_key) {
 470                 int size = bytestream2_get_be16(gb);
 471                 if (!size) {
 472                     bytestream2_get_byte(gb);
 473                     break;
 474                 }
 475                 if (size < 0 || size >= bytestream2_get_bytes_left(gb))
 476                     return -1;
 477                 bytestream2_skip(gb, size);
 478             }
 479             t = amf_tag_skip(gb);
 480             if (t < 0 || bytestream2_get_bytes_left(gb) <= 0)
 481                 return -1;
 482         }
 483         return 0;
 484     case AMF_DATA_TYPE_OBJECT_END:  return 0;
 485     default:                        return -1;
 486     }
 487 }
 488
 489 int ff_amf_tag_size(const uint8_t *data, const uint8_t *data_end)
 490 {
 491     GetByteContext gb;
 492     int ret;
 493
 494     if (data >= data_end)
 495         return -1;
 496
 497     bytestream2_init(&gb, data, data_end - data);
 498
 499     ret = amf_tag_skip(&gb);
 500     if (ret < 0 || bytestream2_get_bytes_left(&gb) <= 0)
 501         return -1;
 502     av_assert0(bytestream2_tell(&gb) >= 0 && bytestream2_tell(&gb) <= data_end - data);
 503     return bytestream2_tell(&gb);
 504 }
 505
 506 static int amf_get_field_value2(GetByteContext *gb,
 507                            const uint8_t *name, uint8_t *dst, int dst_size)
 508 {
 509     int namelen = strlen(name);
 510     int len;
 511
 512     while (bytestream2_peek_byte(gb) != AMF_DATA_TYPE_OBJECT && bytestream2_get_bytes_left(gb) > 0) {
 513         int ret = amf_tag_skip(gb);
 514         if (ret < 0)
 515             return -1;
 516     }
 517     if (bytestream2_get_bytes_left(gb) < 3)
 518         return -1;
 519     bytestream2_get_byte(gb);
 520
 521     for (;;) {
 522         int size = bytestream2_get_be16(gb);
 523         if (!size)
 524             break;
 525         if (size < 0 || size >= bytestream2_get_bytes_left(gb))
 526             return -1;
 527         bytestream2_skip(gb, size);
 528         if (size == namelen && !memcmp(gb->buffer-size, name, namelen)) {
 529             switch (bytestream2_get_byte(gb)) {
 530             case AMF_DATA_TYPE_NUMBER:
 531                 snprintf(dst, dst_size, "%g", av_int2double(bytestream2_get_be64(gb)));
 532                 break;
 533             case AMF_DATA_TYPE_BOOL:
 534                 snprintf(dst, dst_size, "%s", bytestream2_get_byte(gb) ? "true" : "false");
 535                 break;
 536             case AMF_DATA_TYPE_STRING:
 537                 len = bytestream2_get_be16(gb);
 538                 if (dst_size < 1)
 539                     return -1;
 540                 if (dst_size < len + 1)
 541                     len = dst_size - 1;
 542                 bytestream2_get_buffer(gb, dst, len);
 543                 dst[len] = 0;
 544                 break;
 545             default:
 546                 return -1;
 547             }
 548             return 0;
 549         }
 550         len = amf_tag_skip(gb);
 551         if (len < 0 || bytestream2_get_bytes_left(gb) <= 0)
 552             return -1;
 553     }
 554     return -1;
 555 }
 556
 557 int ff_amf_get_field_value(const uint8_t *data, const uint8_t *data_end,
 558                            const uint8_t *name, uint8_t *dst, int dst_size)
 559 {
 560     GetByteContext gb;
 561
 562     if (data >= data_end)
 563         return -1;
 564
 565     bytestream2_init(&gb, data, data_end - data);
 566
 567     return amf_get_field_value2(&gb, name, dst, dst_size);
 568 }
 569
 570 #ifdef DEBUG
 571 static const char* rtmp_packet_type(int type)
 572 {
 573     switch (type) {
 574     case RTMP_PT_CHUNK_SIZE:     return "chunk size";
 575     case RTMP_PT_BYTES_READ:     return "bytes read";
 576     case RTMP_PT_USER_CONTROL:   return "user control";
 577     case RTMP_PT_WINDOW_ACK_SIZE: return "window acknowledgement size";
 578     case RTMP_PT_SET_PEER_BW:    return "set peer bandwidth";
 579     case RTMP_PT_AUDIO:          return "audio packet";
 580     case RTMP_PT_VIDEO:          return "video packet";
 581     case RTMP_PT_FLEX_STREAM:    return "Flex shared stream";
 582     case RTMP_PT_FLEX_OBJECT:    return "Flex shared object";
 583     case RTMP_PT_FLEX_MESSAGE:   return "Flex shared message";
 584     case RTMP_PT_NOTIFY:         return "notification";
 585     case RTMP_PT_SHARED_OBJ:     return "shared object";
 586     case RTMP_PT_INVOKE:         return "invoke";
 587     case RTMP_PT_METADATA:       return "metadata";
 588     default:                     return "unknown";
 589     }
 590 }
 591
 592 static void amf_tag_contents(void *ctx, const uint8_t *data,
 593                              const uint8_t *data_end)
 594 {
 595     unsigned int size, nb = -1;
 596     char buf[1024];
 597     AMFDataType type;
 598     int parse_key = 1;
 599
 600     if (data >= data_end)
 601         return;
 602     switch ((type = *data++)) {
 603     case AMF_DATA_TYPE_NUMBER:
 604         av_log(ctx, AV_LOG_DEBUG, " number %g\n", av_int2double(AV_RB64(data)));
 605         return;
 606     case AMF_DATA_TYPE_BOOL:
 607         av_log(ctx, AV_LOG_DEBUG, " bool %d\n", *data);
 608         return;
 609     case AMF_DATA_TYPE_STRING:
 610     case AMF_DATA_TYPE_LONG_STRING:
 611         if (type == AMF_DATA_TYPE_STRING) {
 612             size = bytestream_get_be16(&data);
 613         } else {
 614             size = bytestream_get_be32(&data);
 615         }
 616         size = FFMIN(size, sizeof(buf) - 1);
 617         memcpy(buf, data, size);
 618         buf[size] = 0;
 619         av_log(ctx, AV_LOG_DEBUG, " string '%s'\n", buf);
 620         return;
 621     case AMF_DATA_TYPE_NULL:
 622         av_log(ctx, AV_LOG_DEBUG, " NULL\n");
 623         return;
 624     case AMF_DATA_TYPE_ARRAY:
 625         parse_key = 0;
 626     case AMF_DATA_TYPE_MIXEDARRAY:
 627         nb = bytestream_get_be32(&data);
 628     case AMF_DATA_TYPE_OBJECT:
 629         av_log(ctx, AV_LOG_DEBUG, " {\n");
 630         while (nb-- > 0 || type != AMF_DATA_TYPE_ARRAY) {
 631             int t;
 632             if (parse_key) {
 633                 size = bytestream_get_be16(&data);
 634                 size = FFMIN(size, sizeof(buf) - 1);
 635                 if (!size) {
 636                     av_log(ctx, AV_LOG_DEBUG, " }\n");
 637                     data++;
 638                     break;
 639                 }
 640                 memcpy(buf, data, size);
 641                 buf[size] = 0;
 642                 if (size >= data_end - data)
 643                     return;
 644                 data += size;
 645                 av_log(ctx, AV_LOG_DEBUG, "  %s: ", buf);
 646             }
 647             amf_tag_contents(ctx, data, data_end);
 648             t = ff_amf_tag_size(data, data_end);
 649             if (t < 0 || t >= data_end - data)
 650                 return;
 651             data += t;
 652         }
 653         return;
 654     case AMF_DATA_TYPE_OBJECT_END:
 655         av_log(ctx, AV_LOG_DEBUG, " }\n");
 656         return;
 657     default:
 658         return;
 659     }
 660 }
 661
 662 void ff_rtmp_packet_dump(void *ctx, RTMPPacket *p)
 663 {
 664     av_log(ctx, AV_LOG_DEBUG, "RTMP packet type '%s'(%d) for channel %d, timestamp %d, extra field %d size %d\n",
 665            rtmp_packet_type(p->type), p->type, p->channel_id, p->timestamp, p->extra, p->size);
 666     if (p->type == RTMP_PT_INVOKE || p->type == RTMP_PT_NOTIFY) {
 667         uint8_t *src = p->data, *src_end = p->data + p->size;
 668         while (src < src_end) {
 669             int sz;
 670             amf_tag_contents(ctx, src, src_end);
 671             sz = ff_amf_tag_size(src, src_end);
 672             if (sz < 0)
 673                 break;
 674             src += sz;
 675         }
 676     } else if (p->type == RTMP_PT_WINDOW_ACK_SIZE) {
 677         av_log(ctx, AV_LOG_DEBUG, "Window acknowledgement size = %d\n", AV_RB32(p->data));
 678     } else if (p->type == RTMP_PT_SET_PEER_BW) {
 679         av_log(ctx, AV_LOG_DEBUG, "Set Peer BW = %d\n", AV_RB32(p->data));
 680     } else if (p->type != RTMP_PT_AUDIO && p->type != RTMP_PT_VIDEO && p->type != RTMP_PT_METADATA) {
 681         int i;
 682         for (i = 0; i < p->size; i++)
 683             av_log(ctx, AV_LOG_DEBUG, " %02X", p->data[i]);
 684         av_log(ctx, AV_LOG_DEBUG, "\n");
 685     }
 686 }
 687 #endif
 688
 689 int ff_amf_match_string(const uint8_t *data, int size, const char *str)
 690 {
 691     int len = strlen(str);
 692     int amf_len, type;
 693
 694     if (size < 1)
 695         return 0;
 696
 697     type = *data++;
 698
 699     if (type != AMF_DATA_TYPE_LONG_STRING &&
 700         type != AMF_DATA_TYPE_STRING)
 701         return 0;
 702
 703     if (type == AMF_DATA_TYPE_LONG_STRING) {
 704         if ((size -= 4 + 1) < 0)
 705             return 0;
 706         amf_len = bytestream_get_be32(&data);
 707     } else {
 708         if ((size -= 2 + 1) < 0)
 709             return 0;
 710         amf_len = bytestream_get_be16(&data);
 711     }
 712
 713     if (amf_len > size)
 714         return 0;
 715
 716     if (amf_len != len)
 717         return 0;
 718
 719     return !memcmp(data, str, len);
 720 }