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2ba45a60 DM |
1 | /* |
2 | * RTP parser for HEVC/H.265 payload format (draft version 6) | |
3 | * Copyright (c) 2014 Thomas Volkert <thomas@homer-conferencing.com> | |
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 | #include "libavutil/avstring.h" | |
f6fa7814 | 24 | #include "libavutil/base64.h" |
2ba45a60 DM |
25 | |
26 | #include "avformat.h" | |
27 | #include "rtpdec.h" | |
28 | ||
29 | #define RTP_HEVC_PAYLOAD_HEADER_SIZE 2 | |
30 | #define RTP_HEVC_FU_HEADER_SIZE 1 | |
31 | #define RTP_HEVC_DONL_FIELD_SIZE 2 | |
32 | #define HEVC_SPECIFIED_NAL_UNIT_TYPES 48 | |
33 | ||
34 | /* SDP out-of-band signaling data */ | |
35 | struct PayloadContext { | |
36 | int using_donl_field; | |
37 | int profile_id; | |
f6fa7814 DM |
38 | uint8_t *sps, *pps, *vps, *sei; |
39 | int sps_size, pps_size, vps_size, sei_size; | |
2ba45a60 DM |
40 | }; |
41 | ||
42 | static const uint8_t start_sequence[] = { 0x00, 0x00, 0x00, 0x01 }; | |
43 | ||
44 | static av_cold PayloadContext *hevc_new_context(void) | |
45 | { | |
46 | return av_mallocz(sizeof(PayloadContext)); | |
47 | } | |
48 | ||
49 | static av_cold void hevc_free_context(PayloadContext *data) | |
50 | { | |
51 | av_free(data); | |
52 | } | |
53 | ||
54 | static av_cold int hevc_init(AVFormatContext *ctx, int st_index, | |
55 | PayloadContext *data) | |
56 | { | |
57 | av_dlog(ctx, "hevc_init() for stream %d\n", st_index); | |
58 | ||
59 | if (st_index < 0) | |
60 | return 0; | |
61 | ||
62 | ctx->streams[st_index]->need_parsing = AVSTREAM_PARSE_FULL; | |
63 | ||
64 | return 0; | |
65 | } | |
66 | ||
67 | static av_cold int hevc_sdp_parse_fmtp_config(AVFormatContext *s, | |
68 | AVStream *stream, | |
69 | PayloadContext *hevc_data, | |
70 | char *attr, char *value) | |
71 | { | |
72 | /* profile-space: 0-3 */ | |
73 | /* profile-id: 0-31 */ | |
74 | if (!strcmp(attr, "profile-id")) { | |
75 | hevc_data->profile_id = atoi(value); | |
76 | av_dlog(s, "SDP: found profile-id: %d\n", hevc_data->profile_id); | |
77 | } | |
78 | ||
79 | /* tier-flag: 0-1 */ | |
80 | /* level-id: 0-255 */ | |
81 | /* interop-constraints: [base16] */ | |
82 | /* profile-compatibility-indicator: [base16] */ | |
83 | /* sprop-sub-layer-id: 0-6, defines highest possible value for TID, default: 6 */ | |
84 | /* recv-sub-layer-id: 0-6 */ | |
85 | /* max-recv-level-id: 0-255 */ | |
86 | /* tx-mode: MSM,SSM */ | |
87 | /* sprop-vps: [base64] */ | |
88 | /* sprop-sps: [base64] */ | |
89 | /* sprop-pps: [base64] */ | |
90 | /* sprop-sei: [base64] */ | |
f6fa7814 DM |
91 | if (!strcmp(attr, "sprop-vps") || !strcmp(attr, "sprop-sps") || |
92 | !strcmp(attr, "sprop-pps") || !strcmp(attr, "sprop-sei")) { | |
93 | uint8_t **data_ptr; | |
94 | int *size_ptr; | |
95 | if (!strcmp(attr, "sprop-vps")) { | |
96 | data_ptr = &hevc_data->vps; | |
97 | size_ptr = &hevc_data->vps_size; | |
98 | } else if (!strcmp(attr, "sprop-sps")) { | |
99 | data_ptr = &hevc_data->sps; | |
100 | size_ptr = &hevc_data->sps_size; | |
101 | } else if (!strcmp(attr, "sprop-pps")) { | |
102 | data_ptr = &hevc_data->pps; | |
103 | size_ptr = &hevc_data->pps_size; | |
104 | } else if (!strcmp(attr, "sprop-sei")) { | |
105 | data_ptr = &hevc_data->sei; | |
106 | size_ptr = &hevc_data->sei_size; | |
107 | } | |
108 | ||
109 | while (*value) { | |
110 | char base64packet[1024]; | |
111 | uint8_t decoded_packet[1024]; | |
112 | int decoded_packet_size; | |
113 | char *dst = base64packet; | |
114 | ||
115 | while (*value && *value != ',' && | |
116 | (dst - base64packet) < sizeof(base64packet) - 1) { | |
117 | *dst++ = *value++; | |
118 | } | |
119 | *dst++ = '\0'; | |
120 | ||
121 | if (*value == ',') | |
122 | value++; | |
123 | ||
124 | decoded_packet_size = av_base64_decode(decoded_packet, base64packet, | |
125 | sizeof(decoded_packet)); | |
126 | if (decoded_packet_size > 0) { | |
127 | uint8_t *tmp = av_realloc(*data_ptr, decoded_packet_size + | |
128 | sizeof(start_sequence) + *size_ptr); | |
129 | if (!tmp) { | |
130 | av_log(s, AV_LOG_ERROR, | |
131 | "Unable to allocate memory for extradata!\n"); | |
132 | return AVERROR(ENOMEM); | |
133 | } | |
134 | *data_ptr = tmp; | |
135 | ||
136 | memcpy(*data_ptr + *size_ptr, start_sequence, | |
137 | sizeof(start_sequence)); | |
138 | memcpy(*data_ptr + *size_ptr + sizeof(start_sequence), | |
139 | decoded_packet, decoded_packet_size); | |
140 | ||
141 | *size_ptr += sizeof(start_sequence) + decoded_packet_size; | |
142 | } | |
143 | } | |
144 | } | |
145 | ||
2ba45a60 DM |
146 | /* max-lsr, max-lps, max-cpb, max-dpb, max-br, max-tr, max-tc */ |
147 | /* max-fps */ | |
148 | ||
149 | /* sprop-max-don-diff: 0-32767 | |
150 | ||
151 | When the RTP stream depends on one or more other RTP | |
152 | streams (in this case tx-mode MUST be equal to "MSM" and | |
153 | MSM is in use), this parameter MUST be present and the | |
154 | value MUST be greater than 0. | |
155 | */ | |
156 | if (!strcmp(attr, "sprop-max-don-diff")) { | |
157 | if (atoi(value) > 0) | |
158 | hevc_data->using_donl_field = 1; | |
159 | av_dlog(s, "Found sprop-max-don-diff in SDP, DON field usage is: %d\n", | |
160 | hevc_data->using_donl_field); | |
161 | } | |
162 | ||
163 | /* sprop-depack-buf-nalus: 0-32767 */ | |
164 | if (!strcmp(attr, "sprop-depack-buf-nalus")) { | |
165 | if (atoi(value) > 0) | |
166 | hevc_data->using_donl_field = 1; | |
167 | av_dlog(s, "Found sprop-depack-buf-nalus in SDP, DON field usage is: %d\n", | |
168 | hevc_data->using_donl_field); | |
169 | } | |
170 | ||
171 | /* sprop-depack-buf-bytes: 0-4294967295 */ | |
172 | /* depack-buf-cap */ | |
173 | /* sprop-segmentation-id: 0-3 */ | |
174 | /* sprop-spatial-segmentation-idc: [base16] */ | |
175 | /* dec-parallel-ca: */ | |
176 | /* include-dph */ | |
177 | ||
178 | return 0; | |
179 | } | |
180 | ||
181 | static av_cold int hevc_parse_sdp_line(AVFormatContext *ctx, int st_index, | |
182 | PayloadContext *hevc_data, const char *line) | |
183 | { | |
184 | AVStream *current_stream; | |
185 | AVCodecContext *codec; | |
186 | const char *sdp_line_ptr = line; | |
187 | ||
188 | if (st_index < 0) | |
189 | return 0; | |
190 | ||
191 | current_stream = ctx->streams[st_index]; | |
192 | codec = current_stream->codec; | |
193 | ||
194 | if (av_strstart(sdp_line_ptr, "framesize:", &sdp_line_ptr)) { | |
195 | char str_video_width[50]; | |
196 | char *str_video_width_ptr = str_video_width; | |
197 | ||
198 | /* | |
199 | * parse "a=framesize:96 320-240" | |
200 | */ | |
201 | ||
202 | /* ignore spaces */ | |
203 | while (*sdp_line_ptr && *sdp_line_ptr == ' ') | |
204 | sdp_line_ptr++; | |
205 | /* ignore RTP payload ID */ | |
206 | while (*sdp_line_ptr && *sdp_line_ptr != ' ') | |
207 | sdp_line_ptr++; | |
208 | /* ignore spaces */ | |
209 | while (*sdp_line_ptr && *sdp_line_ptr == ' ') | |
210 | sdp_line_ptr++; | |
211 | /* extract the actual video resolution description */ | |
212 | while (*sdp_line_ptr && *sdp_line_ptr != '-' && | |
213 | (str_video_width_ptr - str_video_width) < sizeof(str_video_width) - 1) | |
214 | *str_video_width_ptr++ = *sdp_line_ptr++; | |
215 | /* add trailing zero byte */ | |
216 | *str_video_width_ptr = '\0'; | |
217 | ||
218 | /* determine the width value */ | |
219 | codec->width = atoi(str_video_width); | |
220 | /* jump beyond the "-" and determine the height value */ | |
221 | codec->height = atoi(sdp_line_ptr + 1); | |
222 | } else if (av_strstart(sdp_line_ptr, "fmtp:", &sdp_line_ptr)) { | |
f6fa7814 DM |
223 | int ret = ff_parse_fmtp(ctx, current_stream, hevc_data, sdp_line_ptr, |
224 | hevc_sdp_parse_fmtp_config); | |
225 | if (hevc_data->vps_size || hevc_data->sps_size || | |
226 | hevc_data->pps_size || hevc_data->sei_size) { | |
227 | av_freep(&codec->extradata); | |
228 | codec->extradata_size = hevc_data->vps_size + hevc_data->sps_size + | |
229 | hevc_data->pps_size + hevc_data->sei_size; | |
230 | codec->extradata = av_malloc(codec->extradata_size + | |
231 | FF_INPUT_BUFFER_PADDING_SIZE); | |
232 | if (!codec->extradata) { | |
233 | ret = AVERROR(ENOMEM); | |
234 | codec->extradata_size = 0; | |
235 | } else { | |
236 | int pos = 0; | |
237 | memcpy(codec->extradata + pos, hevc_data->vps, hevc_data->vps_size); | |
238 | pos += hevc_data->vps_size; | |
239 | memcpy(codec->extradata + pos, hevc_data->sps, hevc_data->sps_size); | |
240 | pos += hevc_data->sps_size; | |
241 | memcpy(codec->extradata + pos, hevc_data->pps, hevc_data->pps_size); | |
242 | pos += hevc_data->pps_size; | |
243 | memcpy(codec->extradata + pos, hevc_data->sei, hevc_data->sei_size); | |
244 | pos += hevc_data->sei_size; | |
245 | memset(codec->extradata + pos, 0, FF_INPUT_BUFFER_PADDING_SIZE); | |
246 | } | |
247 | ||
248 | av_freep(&hevc_data->vps); | |
249 | av_freep(&hevc_data->sps); | |
250 | av_freep(&hevc_data->pps); | |
251 | av_freep(&hevc_data->sei); | |
252 | hevc_data->vps_size = 0; | |
253 | hevc_data->sps_size = 0; | |
254 | hevc_data->pps_size = 0; | |
255 | hevc_data->sei_size = 0; | |
256 | } | |
257 | return ret; | |
2ba45a60 DM |
258 | } |
259 | ||
260 | return 0; | |
261 | } | |
262 | ||
263 | static int hevc_handle_packet(AVFormatContext *ctx, PayloadContext *rtp_hevc_ctx, | |
264 | AVStream *st, AVPacket *pkt, uint32_t *timestamp, | |
265 | const uint8_t *buf, int len, uint16_t seq, | |
266 | int flags) | |
267 | { | |
268 | const uint8_t *rtp_pl = buf; | |
269 | int tid, lid, nal_type; | |
270 | int first_fragment, last_fragment, fu_type; | |
271 | uint8_t new_nal_header[2]; | |
272 | int res = 0; | |
273 | ||
274 | /* sanity check for size of input packet: 1 byte payload at least */ | |
275 | if (len < RTP_HEVC_PAYLOAD_HEADER_SIZE + 1) { | |
276 | av_log(ctx, AV_LOG_ERROR, "Too short RTP/HEVC packet, got %d bytes\n", len); | |
277 | return AVERROR_INVALIDDATA; | |
278 | } | |
279 | ||
280 | /* | |
281 | decode the HEVC payload header according to section 4 of draft version 6: | |
282 | ||
283 | 0 1 | |
284 | 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 | |
285 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
286 | |F| Type | LayerId | TID | | |
287 | +-------------+-----------------+ | |
288 | ||
289 | Forbidden zero (F): 1 bit | |
290 | NAL unit type (Type): 6 bits | |
291 | NUH layer ID (LayerId): 6 bits | |
292 | NUH temporal ID plus 1 (TID): 3 bits | |
293 | */ | |
294 | nal_type = (buf[0] >> 1) & 0x3f; | |
295 | lid = ((buf[0] << 5) & 0x20) | ((buf[1] >> 3) & 0x1f); | |
296 | tid = buf[1] & 0x07; | |
297 | ||
298 | /* sanity check for correct layer ID */ | |
299 | if (lid) { | |
300 | /* future scalable or 3D video coding extensions */ | |
301 | avpriv_report_missing_feature(ctx, "Multi-layer HEVC coding\n"); | |
302 | return AVERROR_PATCHWELCOME; | |
303 | } | |
304 | ||
305 | /* sanity check for correct temporal ID */ | |
306 | if (!tid) { | |
307 | av_log(ctx, AV_LOG_ERROR, "Illegal temporal ID in RTP/HEVC packet\n"); | |
308 | return AVERROR_INVALIDDATA; | |
309 | } | |
310 | ||
311 | /* sanity check for correct NAL unit type */ | |
312 | if (nal_type > 50) { | |
313 | av_log(ctx, AV_LOG_ERROR, "Unsupported (HEVC) NAL type (%d)\n", nal_type); | |
314 | return AVERROR_INVALIDDATA; | |
315 | } | |
316 | ||
317 | switch (nal_type) { | |
318 | /* aggregated packets (AP) */ | |
319 | case 48: | |
320 | /* pass the HEVC payload header */ | |
321 | buf += RTP_HEVC_PAYLOAD_HEADER_SIZE; | |
322 | len -= RTP_HEVC_PAYLOAD_HEADER_SIZE; | |
323 | ||
324 | /* pass the HEVC DONL field */ | |
325 | if (rtp_hevc_ctx->using_donl_field) { | |
326 | buf += RTP_HEVC_DONL_FIELD_SIZE; | |
327 | len -= RTP_HEVC_DONL_FIELD_SIZE; | |
328 | } | |
329 | ||
330 | /* fall-through */ | |
331 | /* video parameter set (VPS) */ | |
332 | case 32: | |
333 | /* sequence parameter set (SPS) */ | |
334 | case 33: | |
335 | /* picture parameter set (PPS) */ | |
336 | case 34: | |
337 | /* supplemental enhancement information (SEI) */ | |
338 | case 39: | |
339 | /* single NAL unit packet */ | |
340 | default: | |
341 | /* sanity check for size of input packet: 1 byte payload at least */ | |
342 | if (len < 1) { | |
343 | av_log(ctx, AV_LOG_ERROR, | |
344 | "Too short RTP/HEVC packet, got %d bytes of NAL unit type %d\n", | |
345 | len, nal_type); | |
346 | return AVERROR_INVALIDDATA; | |
347 | } | |
348 | ||
349 | /* create A/V packet */ | |
350 | if ((res = av_new_packet(pkt, sizeof(start_sequence) + len)) < 0) | |
351 | return res; | |
352 | /* A/V packet: copy start sequence */ | |
353 | memcpy(pkt->data, start_sequence, sizeof(start_sequence)); | |
354 | /* A/V packet: copy NAL unit data */ | |
355 | memcpy(pkt->data + sizeof(start_sequence), buf, len); | |
356 | ||
357 | break; | |
358 | /* fragmentation unit (FU) */ | |
359 | case 49: | |
360 | /* pass the HEVC payload header */ | |
361 | buf += RTP_HEVC_PAYLOAD_HEADER_SIZE; | |
362 | len -= RTP_HEVC_PAYLOAD_HEADER_SIZE; | |
363 | ||
2ba45a60 DM |
364 | /* |
365 | decode the FU header | |
366 | ||
367 | 0 1 2 3 4 5 6 7 | |
368 | +-+-+-+-+-+-+-+-+ | |
369 | |S|E| FuType | | |
370 | +---------------+ | |
371 | ||
372 | Start fragment (S): 1 bit | |
373 | End fragment (E): 1 bit | |
374 | FuType: 6 bits | |
375 | */ | |
376 | first_fragment = buf[0] & 0x80; | |
377 | last_fragment = buf[0] & 0x40; | |
378 | fu_type = buf[0] & 0x3f; | |
379 | ||
380 | /* pass the HEVC FU header */ | |
381 | buf += RTP_HEVC_FU_HEADER_SIZE; | |
382 | len -= RTP_HEVC_FU_HEADER_SIZE; | |
383 | ||
384 | /* pass the HEVC DONL field */ | |
385 | if (rtp_hevc_ctx->using_donl_field) { | |
386 | buf += RTP_HEVC_DONL_FIELD_SIZE; | |
387 | len -= RTP_HEVC_DONL_FIELD_SIZE; | |
388 | } | |
389 | ||
390 | av_dlog(ctx, " FU type %d with %d bytes\n", fu_type, len); | |
391 | ||
f6fa7814 | 392 | /* sanity check for size of input packet: 1 byte payload at least */ |
2ba45a60 DM |
393 | if (len > 0) { |
394 | new_nal_header[0] = (rtp_pl[0] & 0x81) | (fu_type << 1); | |
395 | new_nal_header[1] = rtp_pl[1]; | |
396 | ||
397 | /* start fragment vs. subsequent fragments */ | |
398 | if (first_fragment) { | |
399 | if (!last_fragment) { | |
400 | /* create A/V packet which is big enough */ | |
401 | if ((res = av_new_packet(pkt, sizeof(start_sequence) + sizeof(new_nal_header) + len)) < 0) | |
402 | return res; | |
403 | /* A/V packet: copy start sequence */ | |
404 | memcpy(pkt->data, start_sequence, sizeof(start_sequence)); | |
405 | /* A/V packet: copy new NAL header */ | |
406 | memcpy(pkt->data + sizeof(start_sequence), new_nal_header, sizeof(new_nal_header)); | |
407 | /* A/V packet: copy NAL unit data */ | |
408 | memcpy(pkt->data + sizeof(start_sequence) + sizeof(new_nal_header), buf, len); | |
409 | } else { | |
410 | av_log(ctx, AV_LOG_ERROR, "Illegal combination of S and E bit in RTP/HEVC packet\n"); | |
411 | res = AVERROR_INVALIDDATA; | |
412 | } | |
413 | } else { | |
414 | /* create A/V packet */ | |
415 | if ((res = av_new_packet(pkt, len)) < 0) | |
416 | return res; | |
417 | /* A/V packet: copy NAL unit data */ | |
418 | memcpy(pkt->data, buf, len); | |
419 | } | |
420 | } else { | |
f6fa7814 DM |
421 | if (len < 0) { |
422 | av_log(ctx, AV_LOG_ERROR, | |
423 | "Too short RTP/HEVC packet, got %d bytes of NAL unit type %d\n", | |
424 | len, nal_type); | |
425 | res = AVERROR_INVALIDDATA; | |
426 | } else { | |
427 | res = AVERROR(EAGAIN); | |
428 | } | |
2ba45a60 DM |
429 | } |
430 | ||
431 | break; | |
432 | /* PACI packet */ | |
433 | case 50: | |
434 | /* Temporal scalability control information (TSCI) */ | |
435 | avpriv_report_missing_feature(ctx, "PACI packets for RTP/HEVC\n"); | |
436 | res = AVERROR_PATCHWELCOME; | |
437 | break; | |
438 | } | |
439 | ||
440 | pkt->stream_index = st->index; | |
441 | ||
442 | return res; | |
443 | } | |
444 | ||
445 | RTPDynamicProtocolHandler ff_hevc_dynamic_handler = { | |
2ba45a60 DM |
446 | .enc_name = "H265", |
447 | .codec_type = AVMEDIA_TYPE_VIDEO, | |
448 | .codec_id = AV_CODEC_ID_HEVC, | |
449 | .init = hevc_init, | |
450 | .parse_sdp_a_line = hevc_parse_sdp_line, | |
451 | .alloc = hevc_new_context, | |
452 | .free = hevc_free_context, | |
453 | .parse_packet = hevc_handle_packet | |
454 | }; |