libavformat/rtp_h264.c

   1 /*
   2  * RTP H264 Protocol (RFC3984)
   3  * Copyright (c) 2006 Ryan Martell.
   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 rtp_h264.c
  24  * @brief H.264 / RTP Code (RFC3984)
  25  * @author Ryan Martell <rdm4@martellventures.com>
  26  *
  27  * @note Notes:
  28  * Notes:
  29  * This currently supports packetization mode:
  30  * Single Nal Unit Mode (0), or
  31  * Non-Interleaved Mode (1).  It currently does not support
  32  * Interleaved Mode (2). (This requires implementing STAP-B, MTAP16, MTAP24, FU-B packet types)
  33  *
  34  * @note TODO:
  35  * 1) RTCP sender reports for udp streams are required..
  36  *
  37  */
  38
  39 #include "avformat.h"
  40 #include "mpegts.h"
  41 #include "bitstream.h"
  42
  43 #include <unistd.h>
  44 #include <sys/types.h>
  45 #include <sys/socket.h>
  46 #include <netinet/in.h>
  47 #include <assert.h>
  48 #ifndef __BEOS__
  49 # include <arpa/inet.h>
  50 #else
  51 # include "barpainet.h"
  52 #endif
  53 #include <netdb.h>
  54
  55 #include "rtp_internal.h"
  56 #include "rtp_h264.h"
  57 #include "base64.h"
  58
  59 /**
  60     RTP/H264 specific private data.
  61 */
  62 typedef struct h264_rtp_extra_data {
  63     unsigned long cookie;       ///< sanity check, to make sure we get the pointer we're expecting.
  64
  65     //sdp setup parameters
  66     uint8_t profile_idc;        ///< from the sdp setup parameters.
  67     uint8_t profile_iop;        ///< from the sdp setup parameters.
  68     uint8_t level_idc;          ///< from the sdp setup parameters.
  69     int packetization_mode;     ///< from the sdp setup parameters.
  70 #ifdef DEBUG
  71     int packet_types_received[32];
  72 #endif
  73 } h264_rtp_extra_data;
  74
  75 #define MAGIC_COOKIE (0xdeadbeef)       ///< Cookie for the extradata; to verify we are what we think we are, and that we haven't been freed.
  76 #define DEAD_COOKIE (0xdeaddead)        ///< Cookie for the extradata; once it is freed.
  77
  78 /* ---------------- private code */
  79 static void sdp_parse_fmtp_config_h264(AVStream * stream,
  80                                        h264_rtp_extra_data * h264_data,
  81                                        char *attr, char *value)
  82 {
  83     AVCodecContext *codec = stream->codec;
  84     assert(codec->codec_id == CODEC_ID_H264);
  85     assert(h264_data != NULL);
  86
  87     if (!strcmp(attr, "packetization-mode")) {
  88         av_log(NULL, AV_LOG_DEBUG, "H.264/RTP Packetization Mode: %d\n", atoi(attr));
  89         h264_data->packetization_mode = atoi(attr);
  90         /*
  91            Packetization Mode:
  92            0 or not present: Single NAL mode (Only nals from 1-23 are allowed)
  93            1: Non-interleaved Mode: 1-23, 24 (STAP-A), 28 (FU-A) are allowed.
  94            2: Interleaved Mode: 25 (STAP-B), 26 (MTAP16), 27 (MTAP24), 28 (FU-A), and 29 (FU-B) are allowed.
  95          */
  96         if (h264_data->packetization_mode > 1)
  97             av_log(stream, AV_LOG_ERROR,
  98                    "H.264/RTP Interleaved RTP mode is not supported yet.");
  99     } else if (!strcmp(attr, "profile-level-id")) {
 100         if (strlen(value) == 6) {
 101             char buffer[3];
 102             // 6 characters=3 bytes, in hex.
 103             uint8_t profile_idc;
 104             uint8_t profile_iop;
 105             uint8_t level_idc;
 106
 107             buffer[0] = value[0]; buffer[1] = value[1]; buffer[2] = '\0';
 108             profile_idc = strtol(buffer, NULL, 16);
 109             buffer[0] = value[2]; buffer[1] = value[3];
 110             profile_iop = strtol(buffer, NULL, 16);
 111             buffer[0] = value[4]; buffer[1] = value[5];
 112             level_idc = strtol(buffer, NULL, 16);
 113
 114             // set the parameters...
 115             av_log(NULL, AV_LOG_DEBUG,
 116                    "H.264/RTP Profile IDC: %x Profile IOP: %x Level: %x\n",
 117                    profile_idc, profile_iop, level_idc);
 118             h264_data->profile_idc = profile_idc;
 119             h264_data->profile_iop = profile_iop;
 120             h264_data->level_idc = level_idc;
 121         }
 122     } else  if (!strcmp(attr, "sprop-parameter-sets")) {
 123         uint8_t start_sequence[]= { 0, 0, 1 };
 124         codec->extradata_size= 0;
 125         codec->extradata= NULL;
 126
 127         while (*value) {
 128             char base64packet[1024];
 129             uint8_t decoded_packet[1024];
 130             uint32_t packet_size;
 131             char *dst = base64packet;
 132
 133             while (*value && *value != ','
 134                    && (dst - base64packet) < sizeof(base64packet) - 1) {
 135                 *dst++ = *value++;
 136             }
 137             *dst++ = '\0';
 138
 139             if (*value == ',')
 140                 value++;
 141
 142             packet_size= av_base64_decode(decoded_packet, base64packet, sizeof(decoded_packet));
 143             if (packet_size) {
 144                 uint8_t *dest= av_malloc(packet_size+sizeof(start_sequence)+codec->extradata_size);
 145                 if(dest)
 146                 {
 147                     if(codec->extradata_size)
 148                     {
 149                         // av_realloc?
 150                         memcpy(dest, codec->extradata, codec->extradata_size);
 151                         av_free(codec->extradata);
 152                     }
 153
 154                     memcpy(dest+codec->extradata_size, start_sequence, sizeof(start_sequence));
 155                     memcpy(dest+codec->extradata_size+sizeof(start_sequence), decoded_packet, packet_size);
 156
 157                     codec->extradata= dest;
 158                     codec->extradata_size+= sizeof(start_sequence)+packet_size;
 159                 } else {
 160                     av_log(NULL, AV_LOG_ERROR, "H.264/RTP Unable to allocate memory for extradata!");
 161                 }
 162             }
 163         }
 164         av_log(NULL, AV_LOG_DEBUG, "H.264/RTP Extradata set to %p (size: %d)!", codec->extradata, codec->extradata_size);
 165     }
 166 }
 167
 168 // return 0 on packet, no more left, 1 on packet, 1 on partial packet...
 169 static int h264_handle_packet(RTPDemuxContext * s,
 170                               AVPacket * pkt,
 171                               uint32_t * timestamp,
 172                               const uint8_t * buf,
 173                               int len)
 174 {
 175 //    h264_rtp_extra_data *data = s->dynamic_protocol_context;
 176     uint8_t nal = buf[0];
 177     uint8_t type = (nal & 0x1f);
 178     int result= 0;
 179     uint8_t start_sequence[]= {0, 0, 1};
 180
 181     assert(data);
 182     assert(data->cookie == MAGIC_COOKIE);
 183     assert(buf);
 184
 185     if (type >= 1 && type <= 23)
 186         type = 1;              // simplify the case. (these are all the nal types used internally by the h264 codec)
 187     switch (type) {
 188     case 0:                    // undefined;
 189         result= -1;
 190         break;
 191
 192     case 1:
 193         av_new_packet(pkt, len+sizeof(start_sequence));
 194         memcpy(pkt->data, start_sequence, sizeof(start_sequence));
 195         memcpy(pkt->data+sizeof(start_sequence), buf, len);
 196 #ifdef DEBUG
 197         data->packet_types_received[nal & 0x1f]++;
 198 #endif
 199         break;
 200
 201     case 24:                   // STAP-A (one packet, multiple nals)
 202         // consume the STAP-A NAL
 203         buf++;
 204         len--;
 205         // first we are going to figure out the total size....
 206         {
 207             int pass= 0;
 208             int total_length= 0;
 209             uint8_t *dst= NULL;
 210
 211             for(pass= 0; pass<2; pass++) {
 212                 const uint8_t *src= buf;
 213                 int src_len= len;
 214
 215                 do {
 216                     uint16_t nal_size = BE_16(src); // this going to be a problem if unaligned (can it be?)
 217
 218                     // consume the length of the aggregate...
 219                     src += 2;
 220                     src_len -= 2;
 221
 222                     if (nal_size <= src_len) {
 223                         if(pass==0) {
 224                             // counting...
 225                             total_length+= sizeof(start_sequence)+nal_size;
 226                         } else {
 227                             // copying
 228                             assert(dst);
 229                             memcpy(dst, start_sequence, sizeof(start_sequence));
 230                             dst+= sizeof(start_sequence);
 231                             memcpy(dst, src, nal_size);
 232 #ifdef DEBUG
 233                             data->packet_types_received[*src & 0x1f]++;
 234 #endif
 235                             dst+= nal_size;
 236                         }
 237                     } else {
 238                         av_log(NULL, AV_LOG_ERROR,
 239                                "nal size exceeds length: %d %d\n", nal_size, src_len);
 240                     }
 241
 242                     // eat what we handled...
 243                     src += nal_size;
 244                     src_len -= nal_size;
 245
 246                     if (src_len < 0)
 247                         av_log(NULL, AV_LOG_ERROR,
 248                                "Consumed more bytes than we got! (%d)\n", src_len);
 249                 } while (src_len > 2);      // because there could be rtp padding..
 250
 251                 if(pass==0) {
 252                     // now we know the total size of the packet (with the start sequences added)
 253                     av_new_packet(pkt, total_length);
 254                     dst= pkt->data;
 255                 } else {
 256                     assert(dst-pkt->data==total_length);
 257                 }
 258             }
 259         }
 260         break;
 261
 262     case 25:                   // STAP-B
 263     case 26:                   // MTAP-16
 264     case 27:                   // MTAP-24
 265     case 29:                   // FU-B
 266         av_log(NULL, AV_LOG_ERROR,
 267                "Unhandled type (%d) (See RFC for implementation details\n",
 268                type);
 269         result= -1;
 270         break;
 271
 272     case 28:                   // FU-A (fragmented nal)
 273         buf++;
 274         len--;                  // skip the fu_indicator
 275         {
 276             // these are the same as above, we just redo them here for clarity...
 277             uint8_t fu_indicator = nal;
 278             uint8_t fu_header = *buf;   // read the fu_header.
 279             uint8_t start_bit = (fu_header & 0x80) >> 7;
 280 //            uint8_t end_bit = (fu_header & 0x40) >> 6;
 281             uint8_t nal_type = (fu_header & 0x1f);
 282             uint8_t reconstructed_nal;
 283
 284             // reconstruct this packet's true nal; only the data follows..
 285             reconstructed_nal = fu_indicator & (0xe0);  // the original nal forbidden bit and NRI are stored in this packet's nal;
 286             reconstructed_nal |= (nal_type & 0x1f);
 287
 288             // skip the fu_header...
 289             buf++;
 290             len--;
 291
 292 #ifdef DEBUG
 293             if (start_bit)
 294                 data->packet_types_received[nal_type & 0x1f]++;
 295 #endif
 296             if(start_bit) {
 297                 // copy in the start sequence, and the reconstructed nal....
 298                 av_new_packet(pkt, sizeof(start_sequence)+sizeof(nal)+len);
 299                 memcpy(pkt->data, start_sequence, sizeof(start_sequence));
 300                 pkt->data[sizeof(start_sequence)]= reconstructed_nal;
 301                 memcpy(pkt->data+sizeof(start_sequence)+sizeof(nal), buf, len);
 302             } else {
 303                 av_new_packet(pkt, len);
 304                 memcpy(pkt->data, buf, len);
 305             }
 306         }
 307         break;
 308
 309     case 30:                   // undefined
 310     case 31:                   // undefined
 311     default:
 312         av_log(NULL, AV_LOG_ERROR, "Undefined type (%d)", type);
 313         result= -1;
 314         break;
 315     }
 316
 317     return result;
 318 }
 319
 320 /* ---------------- public code */
 321 static void *h264_new_extradata()
 322 {
 323     h264_rtp_extra_data *data =
 324         av_mallocz(sizeof(h264_rtp_extra_data) +
 325                    FF_INPUT_BUFFER_PADDING_SIZE);
 326
 327     if (data) {
 328         data->cookie = MAGIC_COOKIE;
 329     }
 330
 331     return data;
 332 }
 333
 334 static void h264_free_extradata(void *d)
 335 {
 336     h264_rtp_extra_data *data = (h264_rtp_extra_data *) d;
 337 #ifdef DEBUG
 338     int ii;
 339
 340     for (ii = 0; ii < 32; ii++) {
 341         if (data->packet_types_received[ii])
 342             av_log(NULL, AV_LOG_DEBUG, "Received %d packets of type %d\n",
 343                    data->packet_types_received[ii], ii);
 344     }
 345 #endif
 346
 347     assert(data);
 348     assert(data->cookie == MAGIC_COOKIE);
 349
 350     // avoid stale pointers (assert)
 351     data->cookie = DEAD_COOKIE;
 352
 353     // and clear out this...
 354     av_free(data);
 355 }
 356
 357 static int parse_h264_sdp_line(AVStream * stream, void *data,
 358                                const char *line)
 359 {
 360     AVCodecContext *codec = stream->codec;
 361     h264_rtp_extra_data *h264_data = (h264_rtp_extra_data *) data;
 362     const char *p = line;
 363
 364     assert(h264_data->cookie == MAGIC_COOKIE);
 365
 366     if (strstart(p, "framesize:", &p)) {
 367         char buf1[50];
 368         char *dst = buf1;
 369
 370         // remove the protocol identifier..
 371         while (*p && *p == ' ') p++; // strip spaces.
 372         while (*p && *p != ' ') p++; // eat protocol identifier
 373         while (*p && *p == ' ') p++; // strip trailing spaces.
 374         while (*p && *p != '-' && (buf1 - dst) < sizeof(buf1) - 1) {
 375             *dst++ = *p++;
 376         }
 377         *dst = '\0';
 378
 379         // a='framesize:96 320-240'
 380         // set our parameters..
 381         codec->width = atoi(buf1);
 382         codec->height = atoi(p + 1); // skip the -
 383         codec->pix_fmt = PIX_FMT_YUV420P;
 384     } else if (strstart(p, "fmtp:", &p)) {
 385         char attr[256];
 386         char value[4096];
 387
 388         // remove the protocol identifier..
 389         while (*p && *p == ' ') p++; // strip spaces.
 390         while (*p && *p != ' ') p++; // eat protocol identifier
 391         while (*p && *p == ' ') p++; // strip trailing spaces.
 392
 393         /* loop on each attribute */
 394         while (rtsp_next_attr_and_value
 395                (&p, attr, sizeof(attr), value, sizeof(value))) {
 396             /* grab the codec extra_data from the config parameter of the fmtp line */
 397             sdp_parse_fmtp_config_h264(stream, h264_data, attr, value);
 398         }
 399     } else if (strstart(p, "cliprect:", &p)) {
 400         // could use this if we wanted.
 401     }
 402
 403     av_set_pts_info(stream, 33, 1, 90000);      // 33 should be right, because the pts is 64 bit? (done elsewhere; this is a one time thing)
 404
 405     return 0;                   // keep processing it the normal way...
 406 }
 407
 408 /**
 409 This is the structure for expanding on the dynamic rtp protocols (makes everything static. yay!)
 410 */
 411 RTPDynamicProtocolHandler ff_h264_dynamic_handler = {
 412     "H264",
 413     CODEC_TYPE_VIDEO,
 414     CODEC_ID_H264,
 415     parse_h264_sdp_line,
 416     h264_new_extradata,
 417     h264_free_extradata,
 418     h264_handle_packet
 419 };