Enable debug variable only when debug code is enabled, fixes the warning:
[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"
f7d78f36 50#include "avstring.h"
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51
52/**
53 RTP/H264 specific private data.
54*/
55typedef 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 */
72static 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")) {
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81 av_log(NULL, AV_LOG_DEBUG, "H.264/RTP Packetization Mode: %d\n", atoi(value));
82 h264_data->packetization_mode = atoi(value);
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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...
162static int h264_handle_packet(RTPDemuxContext * s,
163 AVPacket * pkt,
164 uint32_t * timestamp,
165 const uint8_t * buf,
166 int len)
167{
b7a42d14 168#ifdef DEBUG
bdb4b698 169 h264_rtp_extra_data *data = s->dynamic_protocol_context;
b7a42d14 170#endif
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171 uint8_t nal = buf[0];
172 uint8_t type = (nal & 0x1f);
173 int result= 0;
174 uint8_t start_sequence[]= {0, 0, 1};
175
176 assert(data);
177 assert(data->cookie == MAGIC_COOKIE);
178 assert(buf);
179
180 if (type >= 1 && type <= 23)
181 type = 1; // simplify the case. (these are all the nal types used internally by the h264 codec)
182 switch (type) {
183 case 0: // undefined;
184 result= -1;
185 break;
186
187 case 1:
188 av_new_packet(pkt, len+sizeof(start_sequence));
189 memcpy(pkt->data, start_sequence, sizeof(start_sequence));
190 memcpy(pkt->data+sizeof(start_sequence), buf, len);
191#ifdef DEBUG
192 data->packet_types_received[nal & 0x1f]++;
193#endif
194 break;
195
196 case 24: // STAP-A (one packet, multiple nals)
197 // consume the STAP-A NAL
198 buf++;
199 len--;
200 // first we are going to figure out the total size....
201 {
202 int pass= 0;
203 int total_length= 0;
204 uint8_t *dst= NULL;
205
206 for(pass= 0; pass<2; pass++) {
207 const uint8_t *src= buf;
208 int src_len= len;
209
210 do {
fead30d4 211 uint16_t nal_size = AV_RB16(src); // this going to be a problem if unaligned (can it be?)
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212
213 // consume the length of the aggregate...
214 src += 2;
215 src_len -= 2;
216
217 if (nal_size <= src_len) {
218 if(pass==0) {
219 // counting...
220 total_length+= sizeof(start_sequence)+nal_size;
221 } else {
222 // copying
223 assert(dst);
224 memcpy(dst, start_sequence, sizeof(start_sequence));
225 dst+= sizeof(start_sequence);
226 memcpy(dst, src, nal_size);
227#ifdef DEBUG
228 data->packet_types_received[*src & 0x1f]++;
229#endif
230 dst+= nal_size;
231 }
232 } else {
233 av_log(NULL, AV_LOG_ERROR,
234 "nal size exceeds length: %d %d\n", nal_size, src_len);
235 }
236
237 // eat what we handled...
238 src += nal_size;
239 src_len -= nal_size;
240
241 if (src_len < 0)
242 av_log(NULL, AV_LOG_ERROR,
243 "Consumed more bytes than we got! (%d)\n", src_len);
244 } while (src_len > 2); // because there could be rtp padding..
245
246 if(pass==0) {
247 // now we know the total size of the packet (with the start sequences added)
248 av_new_packet(pkt, total_length);
249 dst= pkt->data;
250 } else {
251 assert(dst-pkt->data==total_length);
252 }
253 }
254 }
255 break;
256
257 case 25: // STAP-B
258 case 26: // MTAP-16
259 case 27: // MTAP-24
260 case 29: // FU-B
261 av_log(NULL, AV_LOG_ERROR,
262 "Unhandled type (%d) (See RFC for implementation details\n",
263 type);
264 result= -1;
265 break;
266
267 case 28: // FU-A (fragmented nal)
268 buf++;
269 len--; // skip the fu_indicator
270 {
271 // these are the same as above, we just redo them here for clarity...
272 uint8_t fu_indicator = nal;
273 uint8_t fu_header = *buf; // read the fu_header.
6ab6525e 274 uint8_t start_bit = fu_header >> 7;
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275// uint8_t end_bit = (fu_header & 0x40) >> 6;
276 uint8_t nal_type = (fu_header & 0x1f);
277 uint8_t reconstructed_nal;
278
279 // reconstruct this packet's true nal; only the data follows..
280 reconstructed_nal = fu_indicator & (0xe0); // the original nal forbidden bit and NRI are stored in this packet's nal;
7699645e 281 reconstructed_nal |= nal_type;
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282
283 // skip the fu_header...
284 buf++;
285 len--;
286
287#ifdef DEBUG
288 if (start_bit)
716f6b47 289 data->packet_types_received[nal_type]++;
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290#endif
291 if(start_bit) {
292 // copy in the start sequence, and the reconstructed nal....
293 av_new_packet(pkt, sizeof(start_sequence)+sizeof(nal)+len);
294 memcpy(pkt->data, start_sequence, sizeof(start_sequence));
295 pkt->data[sizeof(start_sequence)]= reconstructed_nal;
296 memcpy(pkt->data+sizeof(start_sequence)+sizeof(nal), buf, len);
297 } else {
298 av_new_packet(pkt, len);
299 memcpy(pkt->data, buf, len);
300 }
301 }
302 break;
303
304 case 30: // undefined
305 case 31: // undefined
306 default:
307 av_log(NULL, AV_LOG_ERROR, "Undefined type (%d)", type);
308 result= -1;
309 break;
310 }
311
312 return result;
313}
314
315/* ---------------- public code */
2b100ab2 316static void *h264_new_extradata(void)
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317{
318 h264_rtp_extra_data *data =
319 av_mallocz(sizeof(h264_rtp_extra_data) +
320 FF_INPUT_BUFFER_PADDING_SIZE);
321
322 if (data) {
323 data->cookie = MAGIC_COOKIE;
324 }
325
326 return data;
327}
328
329static void h264_free_extradata(void *d)
330{
331 h264_rtp_extra_data *data = (h264_rtp_extra_data *) d;
332#ifdef DEBUG
333 int ii;
334
335 for (ii = 0; ii < 32; ii++) {
336 if (data->packet_types_received[ii])
337 av_log(NULL, AV_LOG_DEBUG, "Received %d packets of type %d\n",
338 data->packet_types_received[ii], ii);
339 }
340#endif
341
342 assert(data);
343 assert(data->cookie == MAGIC_COOKIE);
344
345 // avoid stale pointers (assert)
346 data->cookie = DEAD_COOKIE;
347
348 // and clear out this...
349 av_free(data);
350}
351
352static int parse_h264_sdp_line(AVStream * stream, void *data,
353 const char *line)
354{
355 AVCodecContext *codec = stream->codec;
356 h264_rtp_extra_data *h264_data = (h264_rtp_extra_data *) data;
357 const char *p = line;
358
359 assert(h264_data->cookie == MAGIC_COOKIE);
360
f7d78f36 361 if (av_strstart(p, "framesize:", &p)) {
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362 char buf1[50];
363 char *dst = buf1;
364
365 // remove the protocol identifier..
366 while (*p && *p == ' ') p++; // strip spaces.
367 while (*p && *p != ' ') p++; // eat protocol identifier
368 while (*p && *p == ' ') p++; // strip trailing spaces.
369 while (*p && *p != '-' && (buf1 - dst) < sizeof(buf1) - 1) {
370 *dst++ = *p++;
371 }
372 *dst = '\0';
373
374 // a='framesize:96 320-240'
375 // set our parameters..
376 codec->width = atoi(buf1);
377 codec->height = atoi(p + 1); // skip the -
378 codec->pix_fmt = PIX_FMT_YUV420P;
f7d78f36 379 } else if (av_strstart(p, "fmtp:", &p)) {
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380 char attr[256];
381 char value[4096];
382
383 // remove the protocol identifier..
384 while (*p && *p == ' ') p++; // strip spaces.
385 while (*p && *p != ' ') p++; // eat protocol identifier
386 while (*p && *p == ' ') p++; // strip trailing spaces.
387
388 /* loop on each attribute */
389 while (rtsp_next_attr_and_value
390 (&p, attr, sizeof(attr), value, sizeof(value))) {
391 /* grab the codec extra_data from the config parameter of the fmtp line */
392 sdp_parse_fmtp_config_h264(stream, h264_data, attr, value);
393 }
f7d78f36 394 } else if (av_strstart(p, "cliprect:", &p)) {
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395 // could use this if we wanted.
396 }
397
398 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)
399
400 return 0; // keep processing it the normal way...
401}
402
403/**
404This is the structure for expanding on the dynamic rtp protocols (makes everything static. yay!)
405*/
406RTPDynamicProtocolHandler ff_h264_dynamic_handler = {
407 "H264",
408 CODEC_TYPE_VIDEO,
409 CODEC_ID_H264,
410 parse_h264_sdp_line,
411 h264_new_extradata,
412 h264_free_extradata,
413 h264_handle_packet
414};