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 */ 38struct 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 45static const uint8_t start_sequence[] = { 0x00, 0x00, 0x00, 0x01 }; 46 47static 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 129static 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 177static 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 341const 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