move networking #includes into separate file
[libav.git] / libavformat / rtp_h264.c
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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>
42572ef5 44#include "network.h"
1d1be919 45#include <assert.h>
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46
47#include "rtp_internal.h"
48#include "rtp_h264.h"
49#include "base64.h"
50
51/**
52 RTP/H264 specific private data.
53*/
54typedef struct h264_rtp_extra_data {
55 unsigned long cookie; ///< sanity check, to make sure we get the pointer we're expecting.
56
57 //sdp setup parameters
58 uint8_t profile_idc; ///< from the sdp setup parameters.
59 uint8_t profile_iop; ///< from the sdp setup parameters.
60 uint8_t level_idc; ///< from the sdp setup parameters.
61 int packetization_mode; ///< from the sdp setup parameters.
62#ifdef DEBUG
63 int packet_types_received[32];
64#endif
65} h264_rtp_extra_data;
66
67#define MAGIC_COOKIE (0xdeadbeef) ///< Cookie for the extradata; to verify we are what we think we are, and that we haven't been freed.
68#define DEAD_COOKIE (0xdeaddead) ///< Cookie for the extradata; once it is freed.
69
70/* ---------------- private code */
71static void sdp_parse_fmtp_config_h264(AVStream * stream,
72 h264_rtp_extra_data * h264_data,
73 char *attr, char *value)
74{
75 AVCodecContext *codec = stream->codec;
76 assert(codec->codec_id == CODEC_ID_H264);
77 assert(h264_data != NULL);
78
79 if (!strcmp(attr, "packetization-mode")) {
80 av_log(NULL, AV_LOG_DEBUG, "H.264/RTP Packetization Mode: %d\n", atoi(attr));
81 h264_data->packetization_mode = atoi(attr);
82 /*
83 Packetization Mode:
84 0 or not present: Single NAL mode (Only nals from 1-23 are allowed)
85 1: Non-interleaved Mode: 1-23, 24 (STAP-A), 28 (FU-A) are allowed.
86 2: Interleaved Mode: 25 (STAP-B), 26 (MTAP16), 27 (MTAP24), 28 (FU-A), and 29 (FU-B) are allowed.
87 */
88 if (h264_data->packetization_mode > 1)
89 av_log(stream, AV_LOG_ERROR,
90 "H.264/RTP Interleaved RTP mode is not supported yet.");
91 } else if (!strcmp(attr, "profile-level-id")) {
92 if (strlen(value) == 6) {
93 char buffer[3];
94 // 6 characters=3 bytes, in hex.
95 uint8_t profile_idc;
96 uint8_t profile_iop;
97 uint8_t level_idc;
98
99 buffer[0] = value[0]; buffer[1] = value[1]; buffer[2] = '\0';
100 profile_idc = strtol(buffer, NULL, 16);
101 buffer[0] = value[2]; buffer[1] = value[3];
102 profile_iop = strtol(buffer, NULL, 16);
103 buffer[0] = value[4]; buffer[1] = value[5];
104 level_idc = strtol(buffer, NULL, 16);
105
106 // set the parameters...
107 av_log(NULL, AV_LOG_DEBUG,
108 "H.264/RTP Profile IDC: %x Profile IOP: %x Level: %x\n",
109 profile_idc, profile_iop, level_idc);
110 h264_data->profile_idc = profile_idc;
111 h264_data->profile_iop = profile_iop;
112 h264_data->level_idc = level_idc;
113 }
114 } else if (!strcmp(attr, "sprop-parameter-sets")) {
115 uint8_t start_sequence[]= { 0, 0, 1 };
116 codec->extradata_size= 0;
117 codec->extradata= NULL;
118
119 while (*value) {
120 char base64packet[1024];
121 uint8_t decoded_packet[1024];
122 uint32_t packet_size;
123 char *dst = base64packet;
124
125 while (*value && *value != ','
126 && (dst - base64packet) < sizeof(base64packet) - 1) {
127 *dst++ = *value++;
128 }
129 *dst++ = '\0';
130
131 if (*value == ',')
132 value++;
133
134 packet_size= av_base64_decode(decoded_packet, base64packet, sizeof(decoded_packet));
135 if (packet_size) {
136 uint8_t *dest= av_malloc(packet_size+sizeof(start_sequence)+codec->extradata_size);
137 if(dest)
138 {
139 if(codec->extradata_size)
140 {
141 // av_realloc?
142 memcpy(dest, codec->extradata, codec->extradata_size);
143 av_free(codec->extradata);
144 }
145
146 memcpy(dest+codec->extradata_size, start_sequence, sizeof(start_sequence));
147 memcpy(dest+codec->extradata_size+sizeof(start_sequence), decoded_packet, packet_size);
148
149 codec->extradata= dest;
150 codec->extradata_size+= sizeof(start_sequence)+packet_size;
151 } else {
152 av_log(NULL, AV_LOG_ERROR, "H.264/RTP Unable to allocate memory for extradata!");
153 }
154 }
155 }
156 av_log(NULL, AV_LOG_DEBUG, "H.264/RTP Extradata set to %p (size: %d)!", codec->extradata, codec->extradata_size);
157 }
158}
159
160// return 0 on packet, no more left, 1 on packet, 1 on partial packet...
161static int h264_handle_packet(RTPDemuxContext * s,
162 AVPacket * pkt,
163 uint32_t * timestamp,
164 const uint8_t * buf,
165 int len)
166{
167// h264_rtp_extra_data *data = s->dynamic_protocol_context;
168 uint8_t nal = buf[0];
169 uint8_t type = (nal & 0x1f);
170 int result= 0;
171 uint8_t start_sequence[]= {0, 0, 1};
172
173 assert(data);
174 assert(data->cookie == MAGIC_COOKIE);
175 assert(buf);
176
177 if (type >= 1 && type <= 23)
178 type = 1; // simplify the case. (these are all the nal types used internally by the h264 codec)
179 switch (type) {
180 case 0: // undefined;
181 result= -1;
182 break;
183
184 case 1:
185 av_new_packet(pkt, len+sizeof(start_sequence));
186 memcpy(pkt->data, start_sequence, sizeof(start_sequence));
187 memcpy(pkt->data+sizeof(start_sequence), buf, len);
188#ifdef DEBUG
189 data->packet_types_received[nal & 0x1f]++;
190#endif
191 break;
192
193 case 24: // STAP-A (one packet, multiple nals)
194 // consume the STAP-A NAL
195 buf++;
196 len--;
197 // first we are going to figure out the total size....
198 {
199 int pass= 0;
200 int total_length= 0;
201 uint8_t *dst= NULL;
202
203 for(pass= 0; pass<2; pass++) {
204 const uint8_t *src= buf;
205 int src_len= len;
206
207 do {
fead30d4 208 uint16_t nal_size = AV_RB16(src); // this going to be a problem if unaligned (can it be?)
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209
210 // consume the length of the aggregate...
211 src += 2;
212 src_len -= 2;
213
214 if (nal_size <= src_len) {
215 if(pass==0) {
216 // counting...
217 total_length+= sizeof(start_sequence)+nal_size;
218 } else {
219 // copying
220 assert(dst);
221 memcpy(dst, start_sequence, sizeof(start_sequence));
222 dst+= sizeof(start_sequence);
223 memcpy(dst, src, nal_size);
224#ifdef DEBUG
225 data->packet_types_received[*src & 0x1f]++;
226#endif
227 dst+= nal_size;
228 }
229 } else {
230 av_log(NULL, AV_LOG_ERROR,
231 "nal size exceeds length: %d %d\n", nal_size, src_len);
232 }
233
234 // eat what we handled...
235 src += nal_size;
236 src_len -= nal_size;
237
238 if (src_len < 0)
239 av_log(NULL, AV_LOG_ERROR,
240 "Consumed more bytes than we got! (%d)\n", src_len);
241 } while (src_len > 2); // because there could be rtp padding..
242
243 if(pass==0) {
244 // now we know the total size of the packet (with the start sequences added)
245 av_new_packet(pkt, total_length);
246 dst= pkt->data;
247 } else {
248 assert(dst-pkt->data==total_length);
249 }
250 }
251 }
252 break;
253
254 case 25: // STAP-B
255 case 26: // MTAP-16
256 case 27: // MTAP-24
257 case 29: // FU-B
258 av_log(NULL, AV_LOG_ERROR,
259 "Unhandled type (%d) (See RFC for implementation details\n",
260 type);
261 result= -1;
262 break;
263
264 case 28: // FU-A (fragmented nal)
265 buf++;
266 len--; // skip the fu_indicator
267 {
268 // these are the same as above, we just redo them here for clarity...
269 uint8_t fu_indicator = nal;
270 uint8_t fu_header = *buf; // read the fu_header.
271 uint8_t start_bit = (fu_header & 0x80) >> 7;
272// uint8_t end_bit = (fu_header & 0x40) >> 6;
273 uint8_t nal_type = (fu_header & 0x1f);
274 uint8_t reconstructed_nal;
275
276 // reconstruct this packet's true nal; only the data follows..
277 reconstructed_nal = fu_indicator & (0xe0); // the original nal forbidden bit and NRI are stored in this packet's nal;
278 reconstructed_nal |= (nal_type & 0x1f);
279
280 // skip the fu_header...
281 buf++;
282 len--;
283
284#ifdef DEBUG
285 if (start_bit)
286 data->packet_types_received[nal_type & 0x1f]++;
287#endif
288 if(start_bit) {
289 // copy in the start sequence, and the reconstructed nal....
290 av_new_packet(pkt, sizeof(start_sequence)+sizeof(nal)+len);
291 memcpy(pkt->data, start_sequence, sizeof(start_sequence));
292 pkt->data[sizeof(start_sequence)]= reconstructed_nal;
293 memcpy(pkt->data+sizeof(start_sequence)+sizeof(nal), buf, len);
294 } else {
295 av_new_packet(pkt, len);
296 memcpy(pkt->data, buf, len);
297 }
298 }
299 break;
300
301 case 30: // undefined
302 case 31: // undefined
303 default:
304 av_log(NULL, AV_LOG_ERROR, "Undefined type (%d)", type);
305 result= -1;
306 break;
307 }
308
309 return result;
310}
311
312/* ---------------- public code */
313static void *h264_new_extradata()
314{
315 h264_rtp_extra_data *data =
316 av_mallocz(sizeof(h264_rtp_extra_data) +
317 FF_INPUT_BUFFER_PADDING_SIZE);
318
319 if (data) {
320 data->cookie = MAGIC_COOKIE;
321 }
322
323 return data;
324}
325
326static void h264_free_extradata(void *d)
327{
328 h264_rtp_extra_data *data = (h264_rtp_extra_data *) d;
329#ifdef DEBUG
330 int ii;
331
332 for (ii = 0; ii < 32; ii++) {
333 if (data->packet_types_received[ii])
334 av_log(NULL, AV_LOG_DEBUG, "Received %d packets of type %d\n",
335 data->packet_types_received[ii], ii);
336 }
337#endif
338
339 assert(data);
340 assert(data->cookie == MAGIC_COOKIE);
341
342 // avoid stale pointers (assert)
343 data->cookie = DEAD_COOKIE;
344
345 // and clear out this...
346 av_free(data);
347}
348
349static int parse_h264_sdp_line(AVStream * stream, void *data,
350 const char *line)
351{
352 AVCodecContext *codec = stream->codec;
353 h264_rtp_extra_data *h264_data = (h264_rtp_extra_data *) data;
354 const char *p = line;
355
356 assert(h264_data->cookie == MAGIC_COOKIE);
357
358 if (strstart(p, "framesize:", &p)) {
359 char buf1[50];
360 char *dst = buf1;
361
362 // remove the protocol identifier..
363 while (*p && *p == ' ') p++; // strip spaces.
364 while (*p && *p != ' ') p++; // eat protocol identifier
365 while (*p && *p == ' ') p++; // strip trailing spaces.
366 while (*p && *p != '-' && (buf1 - dst) < sizeof(buf1) - 1) {
367 *dst++ = *p++;
368 }
369 *dst = '\0';
370
371 // a='framesize:96 320-240'
372 // set our parameters..
373 codec->width = atoi(buf1);
374 codec->height = atoi(p + 1); // skip the -
375 codec->pix_fmt = PIX_FMT_YUV420P;
376 } else if (strstart(p, "fmtp:", &p)) {
377 char attr[256];
378 char value[4096];
379
380 // remove the protocol identifier..
381 while (*p && *p == ' ') p++; // strip spaces.
382 while (*p && *p != ' ') p++; // eat protocol identifier
383 while (*p && *p == ' ') p++; // strip trailing spaces.
384
385 /* loop on each attribute */
386 while (rtsp_next_attr_and_value
387 (&p, attr, sizeof(attr), value, sizeof(value))) {
388 /* grab the codec extra_data from the config parameter of the fmtp line */
389 sdp_parse_fmtp_config_h264(stream, h264_data, attr, value);
390 }
391 } else if (strstart(p, "cliprect:", &p)) {
392 // could use this if we wanted.
393 }
394
395 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)
396
397 return 0; // keep processing it the normal way...
398}
399
400/**
401This is the structure for expanding on the dynamic rtp protocols (makes everything static. yay!)
402*/
403RTPDynamicProtocolHandler ff_h264_dynamic_handler = {
404 "H264",
405 CODEC_TYPE_VIDEO,
406 CODEC_ID_H264,
407 parse_h264_sdp_line,
408 h264_new_extradata,
409 h264_free_extradata,
410 h264_handle_packet
411};