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 #include "libavutil/avassert.h"
23 #include "libavutil/avstring.h"
24
25 #include "avformat.h"
26 #include "internal.h"
27 #include "rtpdec.h"
28 #include "rtpdec_formats.h"
29
30 #define RTP_HEVC_PAYLOAD_HEADER_SIZE 2
31 #define RTP_HEVC_FU_HEADER_SIZE 1
32 #define RTP_HEVC_DONL_FIELD_SIZE 2
33 #define RTP_HEVC_DOND_FIELD_SIZE 1
34 #define RTP_HEVC_AP_NALU_LENGTH_FIELD_SIZE 2
35 #define HEVC_SPECIFIED_NAL_UNIT_TYPES 48
36
37 /* SDP out-of-band signaling data */
38 struct PayloadContext {
39 int using_donl_field;
40 int profile_id;
41 uint8_t *sps, *pps, *vps, *sei;
42 int sps_size, pps_size, vps_size, sei_size;
43 };
44
45 static const uint8_t start_sequence[] = { 0x00, 0x00, 0x00, 0x01 };
46
hevc_sdp_parse_fmtp_config(AVFormatContext * s,AVStream * stream,PayloadContext * hevc_data,const char * attr,const char * value)47 static av_cold int hevc_sdp_parse_fmtp_config(AVFormatContext *s,
48 AVStream *stream,
49 PayloadContext *hevc_data,
50 const char *attr, const char *value)
51 {
52 /* profile-space: 0-3 */
53 /* profile-id: 0-31 */
54 if (!strcmp(attr, "profile-id")) {
55 hevc_data->profile_id = atoi(value);
56 av_log(s, AV_LOG_TRACE, "SDP: found profile-id: %d\n", hevc_data->profile_id);
57 }
58
59 /* tier-flag: 0-1 */
60 /* level-id: 0-255 */
61 /* interop-constraints: [base16] */
62 /* profile-compatibility-indicator: [base16] */
63 /* sprop-sub-layer-id: 0-6, defines highest possible value for TID, default: 6 */
64 /* recv-sub-layer-id: 0-6 */
65 /* max-recv-level-id: 0-255 */
66 /* tx-mode: MSM,SSM */
67 /* sprop-vps: [base64] */
68 /* sprop-sps: [base64] */
69 /* sprop-pps: [base64] */
70 /* sprop-sei: [base64] */
71 if (!strcmp(attr, "sprop-vps") || !strcmp(attr, "sprop-sps") ||
72 !strcmp(attr, "sprop-pps") || !strcmp(attr, "sprop-sei")) {
73 uint8_t **data_ptr = NULL;
74 int *size_ptr = NULL;
75 if (!strcmp(attr, "sprop-vps")) {
76 data_ptr = &hevc_data->vps;
77 size_ptr = &hevc_data->vps_size;
78 } else if (!strcmp(attr, "sprop-sps")) {
79 data_ptr = &hevc_data->sps;
80 size_ptr = &hevc_data->sps_size;
81 } else if (!strcmp(attr, "sprop-pps")) {
82 data_ptr = &hevc_data->pps;
83 size_ptr = &hevc_data->pps_size;
84 } else if (!strcmp(attr, "sprop-sei")) {
85 data_ptr = &hevc_data->sei;
86 size_ptr = &hevc_data->sei_size;
87 } else
88 av_assert0(0);
89
90 ff_h264_parse_sprop_parameter_sets(s, data_ptr,
91 size_ptr, value);
92 }
93
94 /* max-lsr, max-lps, max-cpb, max-dpb, max-br, max-tr, max-tc */
95 /* max-fps */
96
97 /* sprop-max-don-diff: 0-32767
98
99 When the RTP stream depends on one or more other RTP
100 streams (in this case tx-mode MUST be equal to "MSM" and
101 MSM is in use), this parameter MUST be present and the
102 value MUST be greater than 0.
103 */
104 if (!strcmp(attr, "sprop-max-don-diff")) {
105 if (atoi(value) > 0)
106 hevc_data->using_donl_field = 1;
107 av_log(s, AV_LOG_TRACE, "Found sprop-max-don-diff in SDP, DON field usage is: %d\n",
108 hevc_data->using_donl_field);
109 }
110
111 /* sprop-depack-buf-nalus: 0-32767 */
112 if (!strcmp(attr, "sprop-depack-buf-nalus")) {
113 if (atoi(value) > 0)
114 hevc_data->using_donl_field = 1;
115 av_log(s, AV_LOG_TRACE, "Found sprop-depack-buf-nalus in SDP, DON field usage is: %d\n",
116 hevc_data->using_donl_field);
117 }
118
119 /* sprop-depack-buf-bytes: 0-4294967295 */
120 /* depack-buf-cap */
121 /* sprop-segmentation-id: 0-3 */
122 /* sprop-spatial-segmentation-idc: [base16] */
123 /* dec-parallel-ca: */
124 /* include-dph */
125
126 return 0;
127 }
128
hevc_parse_sdp_line(AVFormatContext * ctx,int st_index,PayloadContext * hevc_data,const char * line)129 static av_cold int hevc_parse_sdp_line(AVFormatContext *ctx, int st_index,
130 PayloadContext *hevc_data, const char *line)
131 {
132 AVStream *current_stream;
133 AVCodecParameters *par;
134 const char *sdp_line_ptr = line;
135
136 if (st_index < 0)
137 return 0;
138
139 current_stream = ctx->streams[st_index];
140 par = current_stream->codecpar;
141
142 if (av_strstart(sdp_line_ptr, "framesize:", &sdp_line_ptr)) {
143 ff_h264_parse_framesize(par, sdp_line_ptr);
144 } else if (av_strstart(sdp_line_ptr, "fmtp:", &sdp_line_ptr)) {
145 int ret = ff_parse_fmtp(ctx, current_stream, hevc_data, sdp_line_ptr,
146 hevc_sdp_parse_fmtp_config);
147 if (hevc_data->vps_size || hevc_data->sps_size ||
148 hevc_data->pps_size || hevc_data->sei_size) {
149 par->extradata_size = hevc_data->vps_size + hevc_data->sps_size +
150 hevc_data->pps_size + hevc_data->sei_size;
151 if ((ret = ff_alloc_extradata(par, par->extradata_size)) >= 0) {
152 int pos = 0;
153 memcpy(par->extradata + pos, hevc_data->vps, hevc_data->vps_size);
154 pos += hevc_data->vps_size;
155 memcpy(par->extradata + pos, hevc_data->sps, hevc_data->sps_size);
156 pos += hevc_data->sps_size;
157 memcpy(par->extradata + pos, hevc_data->pps, hevc_data->pps_size);
158 pos += hevc_data->pps_size;
159 memcpy(par->extradata + pos, hevc_data->sei, hevc_data->sei_size);
160 }
161
162 av_freep(&hevc_data->vps);
163 av_freep(&hevc_data->sps);
164 av_freep(&hevc_data->pps);
165 av_freep(&hevc_data->sei);
166 hevc_data->vps_size = 0;
167 hevc_data->sps_size = 0;
168 hevc_data->pps_size = 0;
169 hevc_data->sei_size = 0;
170 }
171 return ret;
172 }
173
174 return 0;
175 }
176
hevc_handle_packet(AVFormatContext * ctx,PayloadContext * rtp_hevc_ctx,AVStream * st,AVPacket * pkt,uint32_t * timestamp,const uint8_t * buf,int len,uint16_t seq,int flags)177 static int hevc_handle_packet(AVFormatContext *ctx, PayloadContext *rtp_hevc_ctx,
178 AVStream *st, AVPacket *pkt, uint32_t *timestamp,
179 const uint8_t *buf, int len, uint16_t seq,
180 int flags)
181 {
182 const uint8_t *rtp_pl = buf;
183 int tid, lid, nal_type;
184 int first_fragment, last_fragment, fu_type;
185 uint8_t new_nal_header[2];
186 int res = 0;
187
188 /* sanity check for size of input packet: 1 byte payload at least */
189 if (len < RTP_HEVC_PAYLOAD_HEADER_SIZE + 1) {
190 av_log(ctx, AV_LOG_ERROR, "Too short RTP/HEVC packet, got %d bytes\n", len);
191 return AVERROR_INVALIDDATA;
192 }
193
194 /*
195 * decode the HEVC payload header according to section 4 of draft version 6:
196 *
197 * 0 1
198 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
199 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
200 * |F| Type | LayerId | TID |
201 * +-------------+-----------------+
202 *
203 * Forbidden zero (F): 1 bit
204 * NAL unit type (Type): 6 bits
205 * NUH layer ID (LayerId): 6 bits
206 * NUH temporal ID plus 1 (TID): 3 bits
207 */
208 nal_type = (buf[0] >> 1) & 0x3f;
209 lid = ((buf[0] << 5) & 0x20) | ((buf[1] >> 3) & 0x1f);
210 tid = buf[1] & 0x07;
211
212 /* sanity check for correct layer ID */
213 if (lid) {
214 /* future scalable or 3D video coding extensions */
215 avpriv_report_missing_feature(ctx, "Multi-layer HEVC coding");
216 return AVERROR_PATCHWELCOME;
217 }
218
219 /* sanity check for correct temporal ID */
220 if (!tid) {
221 av_log(ctx, AV_LOG_ERROR, "Illegal temporal ID in RTP/HEVC packet\n");
222 return AVERROR_INVALIDDATA;
223 }
224
225 /* sanity check for correct NAL unit type */
226 if (nal_type > 50) {
227 av_log(ctx, AV_LOG_ERROR, "Unsupported (HEVC) NAL type (%d)\n", nal_type);
228 return AVERROR_INVALIDDATA;
229 }
230
231 switch (nal_type) {
232 /* video parameter set (VPS) */
233 case 32:
234 /* sequence parameter set (SPS) */
235 case 33:
236 /* picture parameter set (PPS) */
237 case 34:
238 /* supplemental enhancement information (SEI) */
239 case 39:
240 /* single NAL unit packet */
241 default:
242 /* create A/V packet */
243 if ((res = av_new_packet(pkt, sizeof(start_sequence) + len)) < 0)
244 return res;
245 /* A/V packet: copy start sequence */
246 memcpy(pkt->data, start_sequence, sizeof(start_sequence));
247 /* A/V packet: copy NAL unit data */
248 memcpy(pkt->data + sizeof(start_sequence), buf, len);
249
250 break;
251 /* aggregated packet (AP) - with two or more NAL units */
252 case 48:
253 /* pass the HEVC payload header */
254 buf += RTP_HEVC_PAYLOAD_HEADER_SIZE;
255 len -= RTP_HEVC_PAYLOAD_HEADER_SIZE;
256
257 /* pass the HEVC DONL field */
258 if (rtp_hevc_ctx->using_donl_field) {
259 buf += RTP_HEVC_DONL_FIELD_SIZE;
260 len -= RTP_HEVC_DONL_FIELD_SIZE;
261 }
262
263 res = ff_h264_handle_aggregated_packet(ctx, rtp_hevc_ctx, pkt, buf, len,
264 rtp_hevc_ctx->using_donl_field ?
265 RTP_HEVC_DOND_FIELD_SIZE : 0,
266 NULL, 0);
267 if (res < 0)
268 return res;
269 break;
270 /* fragmentation unit (FU) */
271 case 49:
272 /* pass the HEVC payload header */
273 buf += RTP_HEVC_PAYLOAD_HEADER_SIZE;
274 len -= RTP_HEVC_PAYLOAD_HEADER_SIZE;
275
276 /*
277 * decode the FU header
278 *
279 * 0 1 2 3 4 5 6 7
280 * +-+-+-+-+-+-+-+-+
281 * |S|E| FuType |
282 * +---------------+
283 *
284 * Start fragment (S): 1 bit
285 * End fragment (E): 1 bit
286 * FuType: 6 bits
287 */
288 first_fragment = buf[0] & 0x80;
289 last_fragment = buf[0] & 0x40;
290 fu_type = buf[0] & 0x3f;
291
292 /* pass the HEVC FU header */
293 buf += RTP_HEVC_FU_HEADER_SIZE;
294 len -= RTP_HEVC_FU_HEADER_SIZE;
295
296 /* pass the HEVC DONL field */
297 if (rtp_hevc_ctx->using_donl_field) {
298 buf += RTP_HEVC_DONL_FIELD_SIZE;
299 len -= RTP_HEVC_DONL_FIELD_SIZE;
300 }
301
302 av_log(ctx, AV_LOG_TRACE, " FU type %d with %d bytes\n", fu_type, len);
303
304 /* sanity check for size of input packet: 1 byte payload at least */
305 if (len <= 0) {
306 if (len < 0) {
307 av_log(ctx, AV_LOG_ERROR,
308 "Too short RTP/HEVC packet, got %d bytes of NAL unit type %d\n",
309 len, nal_type);
310 return AVERROR_INVALIDDATA;
311 } else {
312 return AVERROR(EAGAIN);
313 }
314 }
315
316 if (first_fragment && last_fragment) {
317 av_log(ctx, AV_LOG_ERROR, "Illegal combination of S and E bit in RTP/HEVC packet\n");
318 return AVERROR_INVALIDDATA;
319 }
320
321 new_nal_header[0] = (rtp_pl[0] & 0x81) | (fu_type << 1);
322 new_nal_header[1] = rtp_pl[1];
323
324 res = ff_h264_handle_frag_packet(pkt, buf, len, first_fragment,
325 new_nal_header, sizeof(new_nal_header));
326
327 break;
328 /* PACI packet */
329 case 50:
330 /* Temporal scalability control information (TSCI) */
331 avpriv_report_missing_feature(ctx, "PACI packets for RTP/HEVC");
332 res = AVERROR_PATCHWELCOME;
333 break;
334 }
335
336 pkt->stream_index = st->index;
337
338 return res;
339 }
340
341 const RTPDynamicProtocolHandler ff_hevc_dynamic_handler = {
342 .enc_name = "H265",
343 .codec_type = AVMEDIA_TYPE_VIDEO,
344 .codec_id = AV_CODEC_ID_HEVC,
345 .need_parsing = AVSTREAM_PARSE_FULL,
346 .priv_data_size = sizeof(PayloadContext),
347 .parse_sdp_a_line = hevc_parse_sdp_line,
348 .parse_packet = hevc_handle_packet,
349 };
350