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