add support for rtp/h264 streaming
[libav.git] / libavformat / rtp_h264.c
CommitLineData
1d1be919
RM
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*/
62typedef 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 */
79static 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...
169static 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 */
321static 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
334static 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
357static 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/**
409This is the structure for expanding on the dynamic rtp protocols (makes everything static. yay!)
410*/
411RTPDynamicProtocolHandler 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};