2 * RTP H264 Protocol (RFC3984)
3 * Copyright (c) 2006 Ryan Martell.
5 * This file is part of FFmpeg.
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.
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.
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
24 * @brief H.264 / RTP Code (RFC3984)
25 * @author Ryan Martell <rdm4@martellventures.com>
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)
35 * 1) RTCP sender reports for udp streams are required..
39 #include "libavutil/base64.h"
40 #include "libavutil/avstring.h"
41 #include "libavcodec/bitstream.h"
49 #include "rtp_internal.h"
53 RTP/H264 specific private data.
55 struct PayloadContext
{
56 unsigned long cookie
; ///< sanity check, to make sure we get the pointer we're expecting.
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.
64 int packet_types_received
[32];
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.
71 /* ---------------- private code */
72 static void sdp_parse_fmtp_config_h264(AVStream
* stream
,
73 PayloadContext
* h264_data
,
74 char *attr
, char *value
)
76 AVCodecContext
*codec
= stream
->codec
;
77 assert(codec
->codec_id
== CODEC_ID_H264
);
78 assert(h264_data
!= NULL
);
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
);
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.
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) {
95 // 6 characters=3 bytes, in hex.
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);
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
;
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
;
121 char base64packet
[1024];
122 uint8_t decoded_packet
[1024];
123 uint32_t packet_size
;
124 char *dst
= base64packet
;
126 while (*value
&& *value
!= ','
127 && (dst
- base64packet
) < sizeof(base64packet
) - 1) {
135 packet_size
= av_base64_decode(decoded_packet
, base64packet
, sizeof(decoded_packet
));
137 uint8_t *dest
= av_malloc(packet_size
+sizeof(start_sequence
)+codec
->extradata_size
);
140 if(codec
->extradata_size
)
143 memcpy(dest
, codec
->extradata
, codec
->extradata_size
);
144 av_free(codec
->extradata
);
147 memcpy(dest
+codec
->extradata_size
, start_sequence
, sizeof(start_sequence
));
148 memcpy(dest
+codec
->extradata_size
+sizeof(start_sequence
), decoded_packet
, packet_size
);
150 codec
->extradata
= dest
;
151 codec
->extradata_size
+= sizeof(start_sequence
)+packet_size
;
153 av_log(NULL
, AV_LOG_ERROR
, "H.264/RTP Unable to allocate memory for extradata!");
157 av_log(NULL
, AV_LOG_DEBUG
, "H.264/RTP Extradata set to %p (size: %d)!", codec
->extradata
, codec
->extradata_size
);
161 // return 0 on packet, no more left, 1 on packet, 1 on partial packet...
162 static int h264_handle_packet(PayloadContext
*data
,
165 uint32_t * timestamp
,
169 uint8_t nal
= buf
[0];
170 uint8_t type
= (nal
& 0x1f);
172 uint8_t start_sequence
[]= {0, 0, 1};
176 assert(data
->cookie
== MAGIC_COOKIE
);
180 if (type
>= 1 && type
<= 23)
181 type
= 1; // simplify the case. (these are all the nal types used internally by the h264 codec)
183 case 0: // undefined;
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
);
192 data
->packet_types_received
[nal
& 0x1f]++;
196 case 24: // STAP-A (one packet, multiple nals)
197 // consume the STAP-A NAL
200 // first we are going to figure out the total size....
206 for(pass
= 0; pass
<2; pass
++) {
207 const uint8_t *src
= buf
;
211 uint16_t nal_size
= AV_RB16(src
); // this going to be a problem if unaligned (can it be?)
213 // consume the length of the aggregate...
217 if (nal_size
<= src_len
) {
220 total_length
+= sizeof(start_sequence
)+nal_size
;
224 memcpy(dst
, start_sequence
, sizeof(start_sequence
));
225 dst
+= sizeof(start_sequence
);
226 memcpy(dst
, src
, nal_size
);
228 data
->packet_types_received
[*src
& 0x1f]++;
233 av_log(NULL
, AV_LOG_ERROR
,
234 "nal size exceeds length: %d %d\n", nal_size
, src_len
);
237 // eat what we handled...
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..
247 // now we know the total size of the packet (with the start sequences added)
248 av_new_packet(pkt
, total_length
);
251 assert(dst
-pkt
->data
==total_length
);
261 av_log(NULL
, AV_LOG_ERROR
,
262 "Unhandled type (%d) (See RFC for implementation details\n",
267 case 28: // FU-A (fragmented nal)
269 len
--; // skip the fu_indicator
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.
274 uint8_t start_bit
= fu_header
>> 7;
275 // uint8_t end_bit = (fu_header & 0x40) >> 6;
276 uint8_t nal_type
= (fu_header
& 0x1f);
277 uint8_t reconstructed_nal
;
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;
281 reconstructed_nal
|= nal_type
;
283 // skip the fu_header...
289 data
->packet_types_received
[nal_type
]++;
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
);
298 av_new_packet(pkt
, len
);
299 memcpy(pkt
->data
, buf
, len
);
304 case 30: // undefined
305 case 31: // undefined
307 av_log(NULL
, AV_LOG_ERROR
, "Undefined type (%d)", type
);
315 /* ---------------- public code */
316 static PayloadContext
*h264_new_extradata(void)
318 PayloadContext
*data
=
319 av_mallocz(sizeof(PayloadContext
) +
320 FF_INPUT_BUFFER_PADDING_SIZE
);
323 data
->cookie
= MAGIC_COOKIE
;
329 static void h264_free_extradata(PayloadContext
*data
)
334 for (ii
= 0; ii
< 32; ii
++) {
335 if (data
->packet_types_received
[ii
])
336 av_log(NULL
, AV_LOG_DEBUG
, "Received %d packets of type %d\n",
337 data
->packet_types_received
[ii
], ii
);
342 assert(data
->cookie
== MAGIC_COOKIE
);
344 // avoid stale pointers (assert)
345 data
->cookie
= DEAD_COOKIE
;
347 // and clear out this...
351 static int parse_h264_sdp_line(AVStream
* stream
, PayloadContext
*h264_data
,
354 AVCodecContext
*codec
= stream
->codec
;
355 const char *p
= line
;
357 assert(h264_data
->cookie
== MAGIC_COOKIE
);
359 if (av_strstart(p
, "framesize:", &p
)) {
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) {
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
)) {
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.
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
);
392 } else if (av_strstart(p
, "cliprect:", &p
)) {
393 // could use this if we wanted.
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)
398 return 0; // keep processing it the normal way...
402 This is the structure for expanding on the dynamic rtp protocols (makes everything static. yay!)
404 RTPDynamicProtocolHandler ff_h264_dynamic_handler
= {