9f2c2d5be33bd9bdacae726fb65fc2e32edc4a93
[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 "network.h"
45 #include <assert.h>
46
47 #include "rtp_internal.h"
48 #include "rtp_h264.h"
49 #include "base64.h"
50 #include "avstring.h"
51
52 /**
53 RTP/H264 specific private data.
54 */
55 typedef struct h264_rtp_extra_data {
56 unsigned long cookie; ///< sanity check, to make sure we get the pointer we're expecting.
57
58 //sdp setup parameters
59 uint8_t profile_idc; ///< from the sdp setup parameters.
60 uint8_t profile_iop; ///< from the sdp setup parameters.
61 uint8_t level_idc; ///< from the sdp setup parameters.
62 int packetization_mode; ///< from the sdp setup parameters.
63 #ifdef DEBUG
64 int packet_types_received[32];
65 #endif
66 } h264_rtp_extra_data;
67
68 #define MAGIC_COOKIE (0xdeadbeef) ///< Cookie for the extradata; to verify we are what we think we are, and that we haven't been freed.
69 #define DEAD_COOKIE (0xdeaddead) ///< Cookie for the extradata; once it is freed.
70
71 /* ---------------- private code */
72 static void sdp_parse_fmtp_config_h264(AVStream * stream,
73 h264_rtp_extra_data * h264_data,
74 char *attr, char *value)
75 {
76 AVCodecContext *codec = stream->codec;
77 assert(codec->codec_id == CODEC_ID_H264);
78 assert(h264_data != NULL);
79
80 if (!strcmp(attr, "packetization-mode")) {
81 av_log(NULL, AV_LOG_DEBUG, "H.264/RTP Packetization Mode: %d\n", atoi(value));
82 h264_data->packetization_mode = atoi(value);
83 /*
84 Packetization Mode:
85 0 or not present: Single NAL mode (Only nals from 1-23 are allowed)
86 1: Non-interleaved Mode: 1-23, 24 (STAP-A), 28 (FU-A) are allowed.
87 2: Interleaved Mode: 25 (STAP-B), 26 (MTAP16), 27 (MTAP24), 28 (FU-A), and 29 (FU-B) are allowed.
88 */
89 if (h264_data->packetization_mode > 1)
90 av_log(stream, AV_LOG_ERROR,
91 "H.264/RTP Interleaved RTP mode is not supported yet.");
92 } else if (!strcmp(attr, "profile-level-id")) {
93 if (strlen(value) == 6) {
94 char buffer[3];
95 // 6 characters=3 bytes, in hex.
96 uint8_t profile_idc;
97 uint8_t profile_iop;
98 uint8_t level_idc;
99
100 buffer[0] = value[0]; buffer[1] = value[1]; buffer[2] = '\0';
101 profile_idc = strtol(buffer, NULL, 16);
102 buffer[0] = value[2]; buffer[1] = value[3];
103 profile_iop = strtol(buffer, NULL, 16);
104 buffer[0] = value[4]; buffer[1] = value[5];
105 level_idc = strtol(buffer, NULL, 16);
106
107 // set the parameters...
108 av_log(NULL, AV_LOG_DEBUG,
109 "H.264/RTP Profile IDC: %x Profile IOP: %x Level: %x\n",
110 profile_idc, profile_iop, level_idc);
111 h264_data->profile_idc = profile_idc;
112 h264_data->profile_iop = profile_iop;
113 h264_data->level_idc = level_idc;
114 }
115 } else if (!strcmp(attr, "sprop-parameter-sets")) {
116 uint8_t start_sequence[]= { 0, 0, 1 };
117 codec->extradata_size= 0;
118 codec->extradata= NULL;
119
120 while (*value) {
121 char base64packet[1024];
122 uint8_t decoded_packet[1024];
123 uint32_t packet_size;
124 char *dst = base64packet;
125
126 while (*value && *value != ','
127 && (dst - base64packet) < sizeof(base64packet) - 1) {
128 *dst++ = *value++;
129 }
130 *dst++ = '\0';
131
132 if (*value == ',')
133 value++;
134
135 packet_size= av_base64_decode(decoded_packet, base64packet, sizeof(decoded_packet));
136 if (packet_size) {
137 uint8_t *dest= av_malloc(packet_size+sizeof(start_sequence)+codec->extradata_size);
138 if(dest)
139 {
140 if(codec->extradata_size)
141 {
142 // av_realloc?
143 memcpy(dest, codec->extradata, codec->extradata_size);
144 av_free(codec->extradata);
145 }
146
147 memcpy(dest+codec->extradata_size, start_sequence, sizeof(start_sequence));
148 memcpy(dest+codec->extradata_size+sizeof(start_sequence), decoded_packet, packet_size);
149
150 codec->extradata= dest;
151 codec->extradata_size+= sizeof(start_sequence)+packet_size;
152 } else {
153 av_log(NULL, AV_LOG_ERROR, "H.264/RTP Unable to allocate memory for extradata!");
154 }
155 }
156 }
157 av_log(NULL, AV_LOG_DEBUG, "H.264/RTP Extradata set to %p (size: %d)!", codec->extradata, codec->extradata_size);
158 }
159 }
160
161 // return 0 on packet, no more left, 1 on packet, 1 on partial packet...
162 static int h264_handle_packet(RTPDemuxContext * s,
163 AVPacket * pkt,
164 uint32_t * timestamp,
165 const uint8_t * buf,
166 int len)
167 {
168 h264_rtp_extra_data *data = s->dynamic_protocol_context;
169 uint8_t nal = buf[0];
170 uint8_t type = (nal & 0x1f);
171 int result= 0;
172 uint8_t start_sequence[]= {0, 0, 1};
173
174 assert(data);
175 assert(data->cookie == MAGIC_COOKIE);
176 assert(buf);
177
178 if (type >= 1 && type <= 23)
179 type = 1; // simplify the case. (these are all the nal types used internally by the h264 codec)
180 switch (type) {
181 case 0: // undefined;
182 result= -1;
183 break;
184
185 case 1:
186 av_new_packet(pkt, len+sizeof(start_sequence));
187 memcpy(pkt->data, start_sequence, sizeof(start_sequence));
188 memcpy(pkt->data+sizeof(start_sequence), buf, len);
189 #ifdef DEBUG
190 data->packet_types_received[nal & 0x1f]++;
191 #endif
192 break;
193
194 case 24: // STAP-A (one packet, multiple nals)
195 // consume the STAP-A NAL
196 buf++;
197 len--;
198 // first we are going to figure out the total size....
199 {
200 int pass= 0;
201 int total_length= 0;
202 uint8_t *dst= NULL;
203
204 for(pass= 0; pass<2; pass++) {
205 const uint8_t *src= buf;
206 int src_len= len;
207
208 do {
209 uint16_t nal_size = AV_RB16(src); // this going to be a problem if unaligned (can it be?)
210
211 // consume the length of the aggregate...
212 src += 2;
213 src_len -= 2;
214
215 if (nal_size <= src_len) {
216 if(pass==0) {
217 // counting...
218 total_length+= sizeof(start_sequence)+nal_size;
219 } else {
220 // copying
221 assert(dst);
222 memcpy(dst, start_sequence, sizeof(start_sequence));
223 dst+= sizeof(start_sequence);
224 memcpy(dst, src, nal_size);
225 #ifdef DEBUG
226 data->packet_types_received[*src & 0x1f]++;
227 #endif
228 dst+= nal_size;
229 }
230 } else {
231 av_log(NULL, AV_LOG_ERROR,
232 "nal size exceeds length: %d %d\n", nal_size, src_len);
233 }
234
235 // eat what we handled...
236 src += nal_size;
237 src_len -= nal_size;
238
239 if (src_len < 0)
240 av_log(NULL, AV_LOG_ERROR,
241 "Consumed more bytes than we got! (%d)\n", src_len);
242 } while (src_len > 2); // because there could be rtp padding..
243
244 if(pass==0) {
245 // now we know the total size of the packet (with the start sequences added)
246 av_new_packet(pkt, total_length);
247 dst= pkt->data;
248 } else {
249 assert(dst-pkt->data==total_length);
250 }
251 }
252 }
253 break;
254
255 case 25: // STAP-B
256 case 26: // MTAP-16
257 case 27: // MTAP-24
258 case 29: // FU-B
259 av_log(NULL, AV_LOG_ERROR,
260 "Unhandled type (%d) (See RFC for implementation details\n",
261 type);
262 result= -1;
263 break;
264
265 case 28: // FU-A (fragmented nal)
266 buf++;
267 len--; // skip the fu_indicator
268 {
269 // these are the same as above, we just redo them here for clarity...
270 uint8_t fu_indicator = nal;
271 uint8_t fu_header = *buf; // read the fu_header.
272 uint8_t start_bit = fu_header >> 7;
273 // uint8_t end_bit = (fu_header & 0x40) >> 6;
274 uint8_t nal_type = (fu_header & 0x1f);
275 uint8_t reconstructed_nal;
276
277 // reconstruct this packet's true nal; only the data follows..
278 reconstructed_nal = fu_indicator & (0xe0); // the original nal forbidden bit and NRI are stored in this packet's nal;
279 reconstructed_nal |= nal_type;
280
281 // skip the fu_header...
282 buf++;
283 len--;
284
285 #ifdef DEBUG
286 if (start_bit)
287 data->packet_types_received[nal_type]++;
288 #endif
289 if(start_bit) {
290 // copy in the start sequence, and the reconstructed nal....
291 av_new_packet(pkt, sizeof(start_sequence)+sizeof(nal)+len);
292 memcpy(pkt->data, start_sequence, sizeof(start_sequence));
293 pkt->data[sizeof(start_sequence)]= reconstructed_nal;
294 memcpy(pkt->data+sizeof(start_sequence)+sizeof(nal), buf, len);
295 } else {
296 av_new_packet(pkt, len);
297 memcpy(pkt->data, buf, len);
298 }
299 }
300 break;
301
302 case 30: // undefined
303 case 31: // undefined
304 default:
305 av_log(NULL, AV_LOG_ERROR, "Undefined type (%d)", type);
306 result= -1;
307 break;
308 }
309
310 return result;
311 }
312
313 /* ---------------- public code */
314 static void *h264_new_extradata(void)
315 {
316 h264_rtp_extra_data *data =
317 av_mallocz(sizeof(h264_rtp_extra_data) +
318 FF_INPUT_BUFFER_PADDING_SIZE);
319
320 if (data) {
321 data->cookie = MAGIC_COOKIE;
322 }
323
324 return data;
325 }
326
327 static void h264_free_extradata(void *d)
328 {
329 h264_rtp_extra_data *data = (h264_rtp_extra_data *) d;
330 #ifdef DEBUG
331 int ii;
332
333 for (ii = 0; ii < 32; ii++) {
334 if (data->packet_types_received[ii])
335 av_log(NULL, AV_LOG_DEBUG, "Received %d packets of type %d\n",
336 data->packet_types_received[ii], ii);
337 }
338 #endif
339
340 assert(data);
341 assert(data->cookie == MAGIC_COOKIE);
342
343 // avoid stale pointers (assert)
344 data->cookie = DEAD_COOKIE;
345
346 // and clear out this...
347 av_free(data);
348 }
349
350 static int parse_h264_sdp_line(AVStream * stream, void *data,
351 const char *line)
352 {
353 AVCodecContext *codec = stream->codec;
354 h264_rtp_extra_data *h264_data = (h264_rtp_extra_data *) data;
355 const char *p = line;
356
357 assert(h264_data->cookie == MAGIC_COOKIE);
358
359 if (av_strstart(p, "framesize:", &p)) {
360 char buf1[50];
361 char *dst = buf1;
362
363 // remove the protocol identifier..
364 while (*p && *p == ' ') p++; // strip spaces.
365 while (*p && *p != ' ') p++; // eat protocol identifier
366 while (*p && *p == ' ') p++; // strip trailing spaces.
367 while (*p && *p != '-' && (buf1 - dst) < sizeof(buf1) - 1) {
368 *dst++ = *p++;
369 }
370 *dst = '\0';
371
372 // a='framesize:96 320-240'
373 // set our parameters..
374 codec->width = atoi(buf1);
375 codec->height = atoi(p + 1); // skip the -
376 codec->pix_fmt = PIX_FMT_YUV420P;
377 } else if (av_strstart(p, "fmtp:", &p)) {
378 char attr[256];
379 char value[4096];
380
381 // remove the protocol identifier..
382 while (*p && *p == ' ') p++; // strip spaces.
383 while (*p && *p != ' ') p++; // eat protocol identifier
384 while (*p && *p == ' ') p++; // strip trailing spaces.
385
386 /* loop on each attribute */
387 while (rtsp_next_attr_and_value
388 (&p, attr, sizeof(attr), value, sizeof(value))) {
389 /* grab the codec extra_data from the config parameter of the fmtp line */
390 sdp_parse_fmtp_config_h264(stream, h264_data, attr, value);
391 }
392 } else if (av_strstart(p, "cliprect:", &p)) {
393 // could use this if we wanted.
394 }
395
396 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)
397
398 return 0; // keep processing it the normal way...
399 }
400
401 /**
402 This is the structure for expanding on the dynamic rtp protocols (makes everything static. yay!)
403 */
404 RTPDynamicProtocolHandler ff_h264_dynamic_handler = {
405 "H264",
406 CODEC_TYPE_VIDEO,
407 CODEC_ID_H264,
408 parse_h264_sdp_line,
409 h264_new_extradata,
410 h264_free_extradata,
411 h264_handle_packet
412 };