FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/rtpdec_hevc.c
Date: 2026-09-24 20:08:24
Exec Total Coverage
Lines: 0 130 0.0%
Functions: 0 3 0.0%
Branches: 0 70 0.0%
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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 #include "libavutil/mem.h"
25
26 #include "avformat.h"
27 #include "internal.h"
28 #include "rtpdec.h"
29 #include "rtpdec_formats.h"
30
31 #define RTP_HEVC_PAYLOAD_HEADER_SIZE 2
32 #define RTP_HEVC_FU_HEADER_SIZE 1
33 #define RTP_HEVC_DONL_FIELD_SIZE 2
34 #define RTP_HEVC_DOND_FIELD_SIZE 1
35 #define RTP_HEVC_AP_NALU_LENGTH_FIELD_SIZE 2
36 #define HEVC_SPECIFIED_NAL_UNIT_TYPES 48
37
38 /* SDP out-of-band signaling data */
39 struct PayloadContext {
40 int using_donl_field;
41 int profile_id;
42 uint8_t *sps, *pps, *vps, *sei;
43 int sps_size, pps_size, vps_size, sei_size;
44 };
45
46 static const uint8_t start_sequence[] = { 0x00, 0x00, 0x00, 0x01 };
47
48 ✗ static av_cold int hevc_sdp_parse_fmtp_config(AVFormatContext *s,
49 AVStream *stream,
50 PayloadContext *hevc_data,
51 const char *attr, const char *value)
52 {
53 /* profile-space: 0-3 */
54 /* profile-id: 0-31 */
55 ✗ if (!strcmp(attr, "profile-id")) {
56 ✗ hevc_data->profile_id = atoi(value);
57 ✗ av_log(s, AV_LOG_TRACE, "SDP: found profile-id: %d\n", hevc_data->profile_id);
58 }
59
60 /* tier-flag: 0-1 */
61 /* level-id: 0-255 */
62 /* interop-constraints: [base16] */
63 /* profile-compatibility-indicator: [base16] */
64 /* sprop-sub-layer-id: 0-6, defines highest possible value for TID, default: 6 */
65 /* recv-sub-layer-id: 0-6 */
66 /* max-recv-level-id: 0-255 */
67 /* tx-mode: MSM,SSM */
68 /* sprop-vps: [base64] */
69 /* sprop-sps: [base64] */
70 /* sprop-pps: [base64] */
71 /* sprop-sei: [base64] */
72 ✗ if (!strcmp(attr, "sprop-vps") || !strcmp(attr, "sprop-sps") ||
73 ✗ !strcmp(attr, "sprop-pps") || !strcmp(attr, "sprop-sei")) {
74 ✗ uint8_t **data_ptr = NULL;
75 ✗ int *size_ptr = NULL;
76 ✗ if (!strcmp(attr, "sprop-vps")) {
77 ✗ data_ptr = &hevc_data->vps;
78 ✗ size_ptr = &hevc_data->vps_size;
79 ✗ } else if (!strcmp(attr, "sprop-sps")) {
80 ✗ data_ptr = &hevc_data->sps;
81 ✗ size_ptr = &hevc_data->sps_size;
82 ✗ } else if (!strcmp(attr, "sprop-pps")) {
83 ✗ data_ptr = &hevc_data->pps;
84 ✗ size_ptr = &hevc_data->pps_size;
85 ✗ } else if (!strcmp(attr, "sprop-sei")) {
86 ✗ data_ptr = &hevc_data->sei;
87 ✗ size_ptr = &hevc_data->sei_size;
88 } else
89 ✗ av_assert0(0);
90
91 ✗ ff_h264_parse_sprop_parameter_sets(s, data_ptr,
92 size_ptr, value);
93 }
94
95 /* max-lsr, max-lps, max-cpb, max-dpb, max-br, max-tr, max-tc */
96 /* max-fps */
97
98 /* sprop-max-don-diff: 0-32767
99
100 When the RTP stream depends on one or more other RTP
101 streams (in this case tx-mode MUST be equal to "MSM" and
102 MSM is in use), this parameter MUST be present and the
103 value MUST be greater than 0.
104 */
105 ✗ if (!strcmp(attr, "sprop-max-don-diff")) {
106 ✗ if (atoi(value) > 0)
107 ✗ hevc_data->using_donl_field = 1;
108 ✗ av_log(s, AV_LOG_TRACE, "Found sprop-max-don-diff in SDP, DON field usage is: %d\n",
109 hevc_data->using_donl_field);
110 }
111
112 /* sprop-depack-buf-nalus: 0-32767 */
113 ✗ if (!strcmp(attr, "sprop-depack-buf-nalus")) {
114 ✗ if (atoi(value) > 0)
115 ✗ hevc_data->using_donl_field = 1;
116 ✗ av_log(s, AV_LOG_TRACE, "Found sprop-depack-buf-nalus in SDP, DON field usage is: %d\n",
117 hevc_data->using_donl_field);
118 }
119
120 /* sprop-depack-buf-bytes: 0-4294967295 */
121 /* depack-buf-cap */
122 /* sprop-segmentation-id: 0-3 */
123 /* sprop-spatial-segmentation-idc: [base16] */
124 /* dec-parallel-ca: */
125 /* include-dph */
126
127 ✗ return 0;
128 }
129
130 ✗ static av_cold int hevc_parse_sdp_line(AVFormatContext *ctx, int st_index,
131 PayloadContext *hevc_data, const char *line)
132 {
133 AVStream *current_stream;
134 AVCodecParameters *par;
135 ✗ const char *sdp_line_ptr = line;
136
137 ✗ if (st_index < 0)
138 ✗ return 0;
139
140 ✗ current_stream = ctx->streams[st_index];
141 ✗ par = current_stream->codecpar;
142
143 ✗ if (av_strstart(sdp_line_ptr, "framesize:", &sdp_line_ptr)) {
144 ✗ ff_h264_parse_framesize(par, sdp_line_ptr);
145 ✗ } else if (av_strstart(sdp_line_ptr, "fmtp:", &sdp_line_ptr)) {
146 ✗ int ret = ff_parse_fmtp(ctx, current_stream, hevc_data, sdp_line_ptr,
147 hevc_sdp_parse_fmtp_config);
148 ✗ if (hevc_data->vps_size || hevc_data->sps_size ||
149 ✗ hevc_data->pps_size || hevc_data->sei_size) {
150 ✗ par->extradata_size = hevc_data->vps_size + hevc_data->sps_size +
151 ✗ hevc_data->pps_size + hevc_data->sei_size;
152 ✗ if ((ret = ff_alloc_extradata(par, par->extradata_size)) >= 0) {
153 ✗ int pos = 0;
154 ✗ memcpy(par->extradata + pos, hevc_data->vps, hevc_data->vps_size);
155 ✗ pos += hevc_data->vps_size;
156 ✗ memcpy(par->extradata + pos, hevc_data->sps, hevc_data->sps_size);
157 ✗ pos += hevc_data->sps_size;
158 ✗ memcpy(par->extradata + pos, hevc_data->pps, hevc_data->pps_size);
159 ✗ pos += hevc_data->pps_size;
160 ✗ memcpy(par->extradata + pos, hevc_data->sei, hevc_data->sei_size);
161 }
162
163 ✗ av_freep(&hevc_data->vps);
164 ✗ av_freep(&hevc_data->sps);
165 ✗ av_freep(&hevc_data->pps);
166 ✗ av_freep(&hevc_data->sei);
167 ✗ hevc_data->vps_size = 0;
168 ✗ hevc_data->sps_size = 0;
169 ✗ hevc_data->pps_size = 0;
170 ✗ hevc_data->sei_size = 0;
171 }
172 ✗ return ret;
173 }
174
175 ✗ return 0;
176 }
177
178 ✗ static int hevc_handle_packet(AVFormatContext *ctx, PayloadContext *rtp_hevc_ctx,
179 AVStream *st, AVPacket *pkt, uint32_t *timestamp,
180 const uint8_t *buf, int len, uint16_t seq,
181 int flags)
182 {
183 ✗ const uint8_t *rtp_pl = buf;
184 int tid, lid, nal_type;
185 int first_fragment, last_fragment, fu_type;
186 uint8_t new_nal_header[2];
187 ✗ int res = 0;
188
189 /* sanity check for size of input packet: 1 byte payload at least */
190 ✗ if (len < RTP_HEVC_PAYLOAD_HEADER_SIZE + 1) {
191 ✗ av_log(ctx, AV_LOG_ERROR, "Too short RTP/HEVC packet, got %d bytes\n", len);
192 ✗ return AVERROR_INVALIDDATA;
193 }
194
195 /*
196 * decode the HEVC payload header according to section 4 of draft version 6:
197 *
198 * 0 1
199 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
200 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
201 * |F| Type | LayerId | TID |
202 * +-------------+-----------------+
203 *
204 * Forbidden zero (F): 1 bit
205 * NAL unit type (Type): 6 bits
206 * NUH layer ID (LayerId): 6 bits
207 * NUH temporal ID plus 1 (TID): 3 bits
208 */
209 ✗ nal_type = (buf[0] >> 1) & 0x3f;
210 ✗ lid = ((buf[0] << 5) & 0x20) | ((buf[1] >> 3) & 0x1f);
211 ✗ tid = buf[1] & 0x07;
212
213 /* sanity check for correct layer ID */
214 ✗ if (lid) {
215 /* future scalable or 3D video coding extensions */
216 ✗ avpriv_report_missing_feature(ctx, "Multi-layer HEVC coding");
217 ✗ return AVERROR_PATCHWELCOME;
218 }
219
220 /* sanity check for correct temporal ID */
221 ✗ if (!tid) {
222 ✗ av_log(ctx, AV_LOG_ERROR, "Illegal temporal ID in RTP/HEVC packet\n");
223 ✗ return AVERROR_INVALIDDATA;
224 }
225
226 /* sanity check for correct NAL unit type */
227 ✗ if (nal_type > 50) {
228 ✗ av_log(ctx, AV_LOG_ERROR, "Unsupported (HEVC) NAL type (%d)\n", nal_type);
229 ✗ return AVERROR_INVALIDDATA;
230 }
231
232 ✗ switch (nal_type) {
233 /* video parameter set (VPS) */
234 ✗ case 32:
235 /* sequence parameter set (SPS) */
236 case 33:
237 /* picture parameter set (PPS) */
238 case 34:
239 /* supplemental enhancement information (SEI) */
240 case 39:
241 /* single NAL unit packet */
242 default:
243 /* create A/V packet */
244 ✗ if ((res = av_new_packet(pkt, sizeof(start_sequence) + len)) < 0)
245 ✗ return res;
246 /* A/V packet: copy start sequence */
247 ✗ memcpy(pkt->data, start_sequence, sizeof(start_sequence));
248 /* A/V packet: copy NAL unit data */
249 ✗ memcpy(pkt->data + sizeof(start_sequence), buf, len);
250
251 ✗ break;
252 /* aggregated packet (AP) - with two or more NAL units */
253 ✗ case 48:
254 /* pass the HEVC payload header */
255 ✗ buf += RTP_HEVC_PAYLOAD_HEADER_SIZE;
256 ✗ len -= RTP_HEVC_PAYLOAD_HEADER_SIZE;
257
258 /* pass the HEVC DONL field */
259 ✗ if (rtp_hevc_ctx->using_donl_field) {
260 ✗ buf += RTP_HEVC_DONL_FIELD_SIZE;
261 ✗ len -= RTP_HEVC_DONL_FIELD_SIZE;
262 }
263
264 ✗ res = ff_h264_handle_aggregated_packet(ctx, rtp_hevc_ctx, pkt, buf, len,
265 ✗ rtp_hevc_ctx->using_donl_field ?
266 RTP_HEVC_DOND_FIELD_SIZE : 0,
267 NULL, 0);
268 ✗ if (res < 0)
269 ✗ return res;
270 ✗ break;
271 /* fragmentation unit (FU) */
272 ✗ case 49:
273 /* pass the HEVC payload header */
274 ✗ buf += RTP_HEVC_PAYLOAD_HEADER_SIZE;
275 ✗ len -= RTP_HEVC_PAYLOAD_HEADER_SIZE;
276
277 /*
278 * decode the FU header
279 *
280 * 0 1 2 3 4 5 6 7
281 * +-+-+-+-+-+-+-+-+
282 * |S|E| FuType |
283 * +---------------+
284 *
285 * Start fragment (S): 1 bit
286 * End fragment (E): 1 bit
287 * FuType: 6 bits
288 */
289 ✗ first_fragment = buf[0] & 0x80;
290 ✗ last_fragment = buf[0] & 0x40;
291 ✗ fu_type = buf[0] & 0x3f;
292
293 /* pass the HEVC FU header */
294 ✗ buf += RTP_HEVC_FU_HEADER_SIZE;
295 ✗ len -= RTP_HEVC_FU_HEADER_SIZE;
296
297 /* pass the HEVC DONL field */
298 ✗ if (rtp_hevc_ctx->using_donl_field) {
299 ✗ buf += RTP_HEVC_DONL_FIELD_SIZE;
300 ✗ len -= RTP_HEVC_DONL_FIELD_SIZE;
301 }
302
303 ✗ av_log(ctx, AV_LOG_TRACE, " FU type %d with %d bytes\n", fu_type, len);
304
305 /* sanity check for size of input packet: 1 byte payload at least */
306 ✗ if (len <= 0) {
307 ✗ if (len < 0) {
308 ✗ av_log(ctx, AV_LOG_ERROR,
309 "Too short RTP/HEVC packet, got %d bytes of NAL unit type %d\n",
310 len, nal_type);
311 ✗ return AVERROR_INVALIDDATA;
312 } else {
313 ✗ return AVERROR(EAGAIN);
314 }
315 }
316
317 ✗ if (first_fragment && last_fragment) {
318 ✗ av_log(ctx, AV_LOG_ERROR, "Illegal combination of S and E bit in RTP/HEVC packet\n");
319 ✗ return AVERROR_INVALIDDATA;
320 }
321
322 ✗ new_nal_header[0] = (rtp_pl[0] & 0x81) | (fu_type << 1);
323 ✗ new_nal_header[1] = rtp_pl[1];
324
325 ✗ res = ff_h264_handle_frag_packet(pkt, buf, len, first_fragment,
326 new_nal_header, sizeof(new_nal_header));
327
328 ✗ break;
329 /* PACI packet */
330 ✗ case 50:
331 /* Temporal scalability control information (TSCI) */
332 ✗ avpriv_report_missing_feature(ctx, "PACI packets for RTP/HEVC");
333 ✗ res = AVERROR_PATCHWELCOME;
334 ✗ break;
335 }
336
337 ✗ pkt->stream_index = st->index;
338
339 ✗ return res;
340 }
341
342 const RTPDynamicProtocolHandler ff_hevc_dynamic_handler = {
343 .enc_name = "H265",
344 .codec_type = AVMEDIA_TYPE_VIDEO,
345 .codec_id = AV_CODEC_ID_HEVC,
346 .need_parsing = AVSTREAM_PARSE_FULL,
347 .priv_data_size = sizeof(PayloadContext),
348 .parse_sdp_a_line = hevc_parse_sdp_line,
349 .parse_packet = hevc_handle_packet,
350 };
351