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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 | |
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, | |
33 | * FU-B packet types) | |
34 | */ | |
35 | ||
36 | #include "libavutil/attributes.h" | |
37 | #include "libavutil/base64.h" | |
38 | #include "libavutil/avstring.h" | |
39 | #include "libavcodec/get_bits.h" | |
40 | #include "avformat.h" | |
41 | ||
42 | #include "network.h" | |
43 | #include <assert.h> | |
44 | ||
45 | #include "rtpdec.h" | |
46 | #include "rtpdec_formats.h" | |
47 | ||
48 | struct PayloadContext { | |
49 | // sdp setup parameters | |
50 | uint8_t profile_idc; | |
51 | uint8_t profile_iop; | |
52 | uint8_t level_idc; | |
53 | int packetization_mode; | |
54 | #ifdef DEBUG | |
55 | int packet_types_received[32]; | |
56 | #endif | |
57 | }; | |
58 | ||
59 | #ifdef DEBUG | |
60 | #define COUNT_NAL_TYPE(data, nal) data->packet_types_received[(nal) & 0x1f]++ | |
61 | #else | |
62 | #define COUNT_NAL_TYPE(data, nal) do { } while (0) | |
63 | #endif | |
64 | ||
65 | static const uint8_t start_sequence[] = { 0, 0, 0, 1 }; | |
66 | ||
67 | static int sdp_parse_fmtp_config_h264(AVFormatContext *s, | |
68 | AVStream *stream, | |
69 | PayloadContext *h264_data, | |
70 | char *attr, char *value) | |
71 | { | |
72 | AVCodecContext *codec = stream->codec; | |
73 | assert(codec->codec_id == AV_CODEC_ID_H264); | |
74 | assert(h264_data); | |
75 | ||
76 | if (!strcmp(attr, "packetization-mode")) { | |
77 | av_log(s, AV_LOG_DEBUG, "RTP Packetization Mode: %d\n", atoi(value)); | |
78 | h264_data->packetization_mode = atoi(value); | |
79 | /* | |
80 | * Packetization Mode: | |
81 | * 0 or not present: Single NAL mode (Only nals from 1-23 are allowed) | |
82 | * 1: Non-interleaved Mode: 1-23, 24 (STAP-A), 28 (FU-A) are allowed. | |
83 | * 2: Interleaved Mode: 25 (STAP-B), 26 (MTAP16), 27 (MTAP24), 28 (FU-A), | |
84 | * and 29 (FU-B) are allowed. | |
85 | */ | |
86 | if (h264_data->packetization_mode > 1) | |
87 | av_log(s, AV_LOG_ERROR, | |
88 | "Interleaved RTP mode is not supported yet.\n"); | |
89 | } else if (!strcmp(attr, "profile-level-id")) { | |
90 | if (strlen(value) == 6) { | |
91 | char buffer[3]; | |
92 | // 6 characters=3 bytes, in hex. | |
93 | uint8_t profile_idc; | |
94 | uint8_t profile_iop; | |
95 | uint8_t level_idc; | |
96 | ||
97 | buffer[0] = value[0]; | |
98 | buffer[1] = value[1]; | |
99 | buffer[2] = '\0'; | |
100 | profile_idc = strtol(buffer, NULL, 16); | |
101 | buffer[0] = value[2]; | |
102 | buffer[1] = value[3]; | |
103 | profile_iop = strtol(buffer, NULL, 16); | |
104 | buffer[0] = value[4]; | |
105 | buffer[1] = value[5]; | |
106 | level_idc = strtol(buffer, NULL, 16); | |
107 | ||
108 | av_log(s, AV_LOG_DEBUG, | |
109 | "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 | codec->extradata_size = 0; | |
117 | av_freep(&codec->extradata); | |
118 | ||
119 | while (*value) { | |
120 | char base64packet[1024]; | |
121 | uint8_t decoded_packet[1024]; | |
122 | int 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, | |
135 | sizeof(decoded_packet)); | |
136 | if (packet_size > 0) { | |
137 | uint8_t *dest = av_malloc(packet_size + sizeof(start_sequence) + | |
138 | codec->extradata_size + | |
139 | FF_INPUT_BUFFER_PADDING_SIZE); | |
140 | if (!dest) { | |
141 | av_log(s, AV_LOG_ERROR, | |
142 | "Unable to allocate memory for extradata!\n"); | |
143 | return AVERROR(ENOMEM); | |
144 | } | |
145 | if (codec->extradata_size) { | |
146 | memcpy(dest, codec->extradata, codec->extradata_size); | |
147 | av_free(codec->extradata); | |
148 | } | |
149 | ||
150 | memcpy(dest + codec->extradata_size, start_sequence, | |
151 | sizeof(start_sequence)); | |
152 | memcpy(dest + codec->extradata_size + sizeof(start_sequence), | |
153 | decoded_packet, packet_size); | |
154 | memset(dest + codec->extradata_size + sizeof(start_sequence) + | |
155 | packet_size, 0, FF_INPUT_BUFFER_PADDING_SIZE); | |
156 | ||
157 | codec->extradata = dest; | |
158 | codec->extradata_size += sizeof(start_sequence) + packet_size; | |
159 | } | |
160 | } | |
161 | av_log(s, AV_LOG_DEBUG, "Extradata set to %p (size: %d)!\n", | |
162 | codec->extradata, codec->extradata_size); | |
163 | } | |
164 | return 0; | |
165 | } | |
166 | ||
167 | // return 0 on packet, no more left, 1 on packet, 1 on partial packet | |
168 | static int h264_handle_packet(AVFormatContext *ctx, PayloadContext *data, | |
169 | AVStream *st, AVPacket *pkt, uint32_t *timestamp, | |
170 | const uint8_t *buf, int len, uint16_t seq, | |
171 | int flags) | |
172 | { | |
173 | uint8_t nal; | |
174 | uint8_t type; | |
175 | int result = 0; | |
176 | ||
177 | if (!len) { | |
178 | av_log(ctx, AV_LOG_ERROR, "Empty H264 RTP packet\n"); | |
179 | return AVERROR_INVALIDDATA; | |
180 | } | |
181 | nal = buf[0]; | |
182 | type = nal & 0x1f; | |
183 | ||
184 | assert(data); | |
185 | assert(buf); | |
186 | ||
187 | /* Simplify the case (these are all the nal types used internally by | |
188 | * the h264 codec). */ | |
189 | if (type >= 1 && type <= 23) | |
190 | type = 1; | |
191 | switch (type) { | |
192 | case 0: // undefined, but pass them through | |
193 | case 1: | |
194 | if ((result = av_new_packet(pkt, len + sizeof(start_sequence))) < 0) | |
195 | return result; | |
196 | memcpy(pkt->data, start_sequence, sizeof(start_sequence)); | |
197 | memcpy(pkt->data + sizeof(start_sequence), buf, len); | |
198 | COUNT_NAL_TYPE(data, nal); | |
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 | while (src_len > 2) { | |
216 | uint16_t nal_size = AV_RB16(src); | |
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 | COUNT_NAL_TYPE(data, *src); | |
233 | dst += nal_size; | |
234 | } | |
235 | } else { | |
236 | av_log(ctx, AV_LOG_ERROR, | |
237 | "nal size exceeds length: %d %d\n", nal_size, src_len); | |
238 | } | |
239 | ||
240 | // eat what we handled | |
241 | src += nal_size; | |
242 | src_len -= nal_size; | |
243 | ||
244 | if (src_len < 0) | |
245 | av_log(ctx, AV_LOG_ERROR, | |
246 | "Consumed more bytes than we got! (%d)\n", src_len); | |
247 | } | |
248 | ||
249 | if (pass == 0) { | |
250 | /* now we know the total size of the packet (with the | |
251 | * start sequences added) */ | |
252 | if ((result = av_new_packet(pkt, total_length)) < 0) | |
253 | return result; | |
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(ctx, AV_LOG_ERROR, | |
267 | "Unhandled type (%d) (See RFC for implementation details\n", | |
268 | type); | |
269 | result = AVERROR(ENOSYS); | |
270 | break; | |
271 | ||
272 | case 28: // FU-A (fragmented nal) | |
273 | buf++; | |
274 | len--; // skip the fu_indicator | |
275 | if (len > 1) { | |
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; | |
279 | uint8_t start_bit = fu_header >> 7; | |
280 | uint8_t av_unused 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 | /* The original nal forbidden bit and NRI are stored in this | |
286 | * packet's nal. */ | |
287 | reconstructed_nal = fu_indicator & 0xe0; | |
288 | reconstructed_nal |= nal_type; | |
289 | ||
290 | // skip the fu_header | |
291 | buf++; | |
292 | len--; | |
293 | ||
294 | if (start_bit) | |
295 | COUNT_NAL_TYPE(data, nal_type); | |
296 | if (start_bit) { | |
297 | /* copy in the start sequence, and the reconstructed nal */ | |
298 | if ((result = av_new_packet(pkt, sizeof(start_sequence) + sizeof(nal) + len)) < 0) | |
299 | return result; | |
300 | memcpy(pkt->data, start_sequence, sizeof(start_sequence)); | |
301 | pkt->data[sizeof(start_sequence)] = reconstructed_nal; | |
302 | memcpy(pkt->data + sizeof(start_sequence) + sizeof(nal), buf, len); | |
303 | } else { | |
304 | if ((result = av_new_packet(pkt, len)) < 0) | |
305 | return result; | |
306 | memcpy(pkt->data, buf, len); | |
307 | } | |
308 | } else { | |
309 | av_log(ctx, AV_LOG_ERROR, "Too short data for FU-A H264 RTP packet\n"); | |
310 | result = AVERROR_INVALIDDATA; | |
311 | } | |
312 | break; | |
313 | ||
314 | case 30: // undefined | |
315 | case 31: // undefined | |
316 | default: | |
317 | av_log(ctx, AV_LOG_ERROR, "Undefined type (%d)\n", type); | |
318 | result = AVERROR_INVALIDDATA; | |
319 | break; | |
320 | } | |
321 | ||
322 | pkt->stream_index = st->index; | |
323 | ||
324 | return result; | |
325 | } | |
326 | ||
327 | static PayloadContext *h264_new_context(void) | |
328 | { | |
329 | return av_mallocz(sizeof(PayloadContext) + FF_INPUT_BUFFER_PADDING_SIZE); | |
330 | } | |
331 | ||
332 | static void h264_free_context(PayloadContext *data) | |
333 | { | |
334 | #ifdef DEBUG | |
335 | int ii; | |
336 | ||
337 | for (ii = 0; ii < 32; ii++) { | |
338 | if (data->packet_types_received[ii]) | |
339 | av_log(NULL, AV_LOG_DEBUG, "Received %d packets of type %d\n", | |
340 | data->packet_types_received[ii], ii); | |
341 | } | |
342 | #endif | |
343 | ||
344 | av_free(data); | |
345 | } | |
346 | ||
347 | static av_cold int h264_init(AVFormatContext *s, int st_index, | |
348 | PayloadContext *data) | |
349 | { | |
350 | if (st_index < 0) | |
351 | return 0; | |
352 | s->streams[st_index]->need_parsing = AVSTREAM_PARSE_FULL; | |
353 | return 0; | |
354 | } | |
355 | ||
356 | static int parse_h264_sdp_line(AVFormatContext *s, int st_index, | |
357 | PayloadContext *h264_data, const char *line) | |
358 | { | |
359 | AVStream *stream; | |
360 | AVCodecContext *codec; | |
361 | const char *p = line; | |
362 | ||
363 | if (st_index < 0) | |
364 | return 0; | |
365 | ||
366 | stream = s->streams[st_index]; | |
367 | codec = stream->codec; | |
368 | ||
369 | if (av_strstart(p, "framesize:", &p)) { | |
370 | char buf1[50]; | |
371 | char *dst = buf1; | |
372 | ||
373 | // remove the protocol identifier | |
374 | while (*p && *p == ' ') | |
375 | p++; // strip spaces. | |
376 | while (*p && *p != ' ') | |
377 | p++; // eat protocol identifier | |
378 | while (*p && *p == ' ') | |
379 | p++; // strip trailing spaces. | |
380 | while (*p && *p != '-' && (dst - buf1) < sizeof(buf1) - 1) | |
381 | *dst++ = *p++; | |
382 | *dst = '\0'; | |
383 | ||
384 | // a='framesize:96 320-240' | |
385 | // set our parameters | |
386 | codec->width = atoi(buf1); | |
387 | codec->height = atoi(p + 1); // skip the - | |
388 | } else if (av_strstart(p, "fmtp:", &p)) { | |
389 | return ff_parse_fmtp(s, stream, h264_data, p, sdp_parse_fmtp_config_h264); | |
390 | } else if (av_strstart(p, "cliprect:", &p)) { | |
391 | // could use this if we wanted. | |
392 | } | |
393 | ||
394 | return 0; | |
395 | } | |
396 | ||
397 | RTPDynamicProtocolHandler ff_h264_dynamic_handler = { | |
398 | .enc_name = "H264", | |
399 | .codec_type = AVMEDIA_TYPE_VIDEO, | |
400 | .codec_id = AV_CODEC_ID_H264, | |
401 | .init = h264_init, | |
402 | .parse_sdp_a_line = parse_h264_sdp_line, | |
403 | .alloc = h264_new_context, | |
404 | .free = h264_free_context, | |
405 | .parse_packet = h264_handle_packet | |
406 | }; |