/* * RTP parser for HEVC/H.265 payload format (draft version 6) * Copyright (c) 2014 Thomas Volkert * * This file is part of Libav. * * Libav is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * Libav is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "libavutil/avstring.h" #include "libavutil/base64.h" #include "avformat.h" #include "rtpdec.h" #include "rtpdec_formats.h" #define RTP_HEVC_PAYLOAD_HEADER_SIZE 2 #define RTP_HEVC_FU_HEADER_SIZE 1 #define RTP_HEVC_DONL_FIELD_SIZE 2 #define RTP_HEVC_DOND_FIELD_SIZE 1 #define HEVC_SPECIFIED_NAL_UNIT_TYPES 48 /* SDP out-of-band signaling data */ struct PayloadContext { int using_donl_field; int profile_id; uint8_t *sps, *pps, *vps, *sei; int sps_size, pps_size, vps_size, sei_size; }; static const uint8_t start_sequence[] = { 0x00, 0x00, 0x00, 0x01 }; static av_cold int hevc_sdp_parse_fmtp_config(AVFormatContext *s, AVStream *stream, PayloadContext *hevc_data, const char *attr, const char *value) { /* profile-space: 0-3 */ /* profile-id: 0-31 */ if (!strcmp(attr, "profile-id")) { hevc_data->profile_id = atoi(value); av_log(s, AV_LOG_TRACE, "SDP: found profile-id: %d\n", hevc_data->profile_id); } /* tier-flag: 0-1 */ /* level-id: 0-255 */ /* interop-constraints: [base16] */ /* profile-compatibility-indicator: [base16] */ /* sprop-sub-layer-id: 0-6, defines highest possible value for TID, default: 6 */ /* recv-sub-layer-id: 0-6 */ /* max-recv-level-id: 0-255 */ /* tx-mode: MSM,SSM */ /* sprop-vps: [base64] */ /* sprop-sps: [base64] */ /* sprop-pps: [base64] */ /* sprop-sei: [base64] */ if (!strcmp(attr, "sprop-vps") || !strcmp(attr, "sprop-sps") || !strcmp(attr, "sprop-pps") || !strcmp(attr, "sprop-sei")) { uint8_t **data_ptr = NULL; int *size_ptr = NULL; if (!strcmp(attr, "sprop-vps")) { data_ptr = &hevc_data->vps; size_ptr = &hevc_data->vps_size; } else if (!strcmp(attr, "sprop-sps")) { data_ptr = &hevc_data->sps; size_ptr = &hevc_data->sps_size; } else if (!strcmp(attr, "sprop-pps")) { data_ptr = &hevc_data->pps; size_ptr = &hevc_data->pps_size; } else if (!strcmp(attr, "sprop-sei")) { data_ptr = &hevc_data->sei; size_ptr = &hevc_data->sei_size; } ff_h264_parse_sprop_parameter_sets(s, data_ptr, size_ptr, value); } /* max-lsr, max-lps, max-cpb, max-dpb, max-br, max-tr, max-tc */ /* max-fps */ /* sprop-max-don-diff: 0-32767 When the RTP stream depends on one or more other RTP streams (in this case tx-mode MUST be equal to "MSM" and MSM is in use), this parameter MUST be present and the value MUST be greater than 0. */ if (!strcmp(attr, "sprop-max-don-diff")) { if (atoi(value) > 0) hevc_data->using_donl_field = 1; av_log(s, AV_LOG_TRACE, "Found sprop-max-don-diff in SDP, DON field usage is: %d\n", hevc_data->using_donl_field); } /* sprop-depack-buf-nalus: 0-32767 */ if (!strcmp(attr, "sprop-depack-buf-nalus")) { if (atoi(value) > 0) hevc_data->using_donl_field = 1; av_log(s, AV_LOG_TRACE, "Found sprop-depack-buf-nalus in SDP, DON field usage is: %d\n", hevc_data->using_donl_field); } /* sprop-depack-buf-bytes: 0-4294967295 */ /* depack-buf-cap */ /* sprop-segmentation-id: 0-3 */ /* sprop-spatial-segmentation-idc: [base16] */ /* dec-parallel-ca: */ /* include-dph */ return 0; } static av_cold int hevc_parse_sdp_line(AVFormatContext *ctx, int st_index, PayloadContext *hevc_data, const char *line) { AVStream *current_stream; AVCodecParameters *par; const char *sdp_line_ptr = line; if (st_index < 0) return 0; current_stream = ctx->streams[st_index]; par = current_stream->codecpar; if (av_strstart(sdp_line_ptr, "framesize:", &sdp_line_ptr)) { ff_h264_parse_framesize(par, sdp_line_ptr); } else if (av_strstart(sdp_line_ptr, "fmtp:", &sdp_line_ptr)) { int ret = ff_parse_fmtp(ctx, current_stream, hevc_data, sdp_line_ptr, hevc_sdp_parse_fmtp_config); if (hevc_data->vps_size || hevc_data->sps_size || hevc_data->pps_size || hevc_data->sei_size) { av_freep(&par->extradata); par->extradata_size = hevc_data->vps_size + hevc_data->sps_size + hevc_data->pps_size + hevc_data->sei_size; par->extradata = av_malloc(par->extradata_size + AV_INPUT_BUFFER_PADDING_SIZE); if (!par->extradata) { ret = AVERROR(ENOMEM); par->extradata_size = 0; } else { int pos = 0; memcpy(par->extradata + pos, hevc_data->vps, hevc_data->vps_size); pos += hevc_data->vps_size; memcpy(par->extradata + pos, hevc_data->sps, hevc_data->sps_size); pos += hevc_data->sps_size; memcpy(par->extradata + pos, hevc_data->pps, hevc_data->pps_size); pos += hevc_data->pps_size; memcpy(par->extradata + pos, hevc_data->sei, hevc_data->sei_size); pos += hevc_data->sei_size; memset(par->extradata + pos, 0, AV_INPUT_BUFFER_PADDING_SIZE); } av_freep(&hevc_data->vps); av_freep(&hevc_data->sps); av_freep(&hevc_data->pps); av_freep(&hevc_data->sei); hevc_data->vps_size = 0; hevc_data->sps_size = 0; hevc_data->pps_size = 0; hevc_data->sei_size = 0; } return ret; } return 0; } static int 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) { const uint8_t *rtp_pl = buf; int tid, lid, nal_type; int first_fragment, last_fragment, fu_type; uint8_t new_nal_header[2]; int res = 0; /* sanity check for size of input packet: 1 byte payload at least */ if (len < RTP_HEVC_PAYLOAD_HEADER_SIZE + 1) { av_log(ctx, AV_LOG_ERROR, "Too short RTP/HEVC packet, got %d bytes\n", len); return AVERROR_INVALIDDATA; } /* * decode the HEVC payload header according to section 4 of draft version 6: * * 0 1 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * |F| Type | LayerId | TID | * +-------------+-----------------+ * * Forbidden zero (F): 1 bit * NAL unit type (Type): 6 bits * NUH layer ID (LayerId): 6 bits * NUH temporal ID plus 1 (TID): 3 bits */ nal_type = (buf[0] >> 1) & 0x3f; lid = ((buf[0] << 5) & 0x20) | ((buf[1] >> 3) & 0x1f); tid = buf[1] & 0x07; /* sanity check for correct layer ID */ if (lid) { /* future scalable or 3D video coding extensions */ avpriv_report_missing_feature(ctx, "Multi-layer HEVC coding"); return AVERROR_PATCHWELCOME; } /* sanity check for correct temporal ID */ if (!tid) { av_log(ctx, AV_LOG_ERROR, "Illegal temporal ID in RTP/HEVC packet\n"); return AVERROR_INVALIDDATA; } /* sanity check for correct NAL unit type */ if (nal_type > 50) { av_log(ctx, AV_LOG_ERROR, "Unsupported (HEVC) NAL type (%d)\n", nal_type); return AVERROR_INVALIDDATA; } switch (nal_type) { /* video parameter set (VPS) */ case 32: /* sequence parameter set (SPS) */ case 33: /* picture parameter set (PPS) */ case 34: /* supplemental enhancement information (SEI) */ case 39: /* single NAL unit packet */ default: /* create A/V packet */ if ((res = av_new_packet(pkt, sizeof(start_sequence) + len)) < 0) return res; /* A/V packet: copy start sequence */ memcpy(pkt->data, start_sequence, sizeof(start_sequence)); /* A/V packet: copy NAL unit data */ memcpy(pkt->data + sizeof(start_sequence), buf, len); break; /* aggregated packet (AP) - with two or more NAL units */ case 48: /* pass the HEVC payload header */ buf += RTP_HEVC_PAYLOAD_HEADER_SIZE; len -= RTP_HEVC_PAYLOAD_HEADER_SIZE; /* pass the HEVC DONL field */ if (rtp_hevc_ctx->using_donl_field) { buf += RTP_HEVC_DONL_FIELD_SIZE; len -= RTP_HEVC_DONL_FIELD_SIZE; } res = ff_h264_handle_aggregated_packet(ctx, pkt, buf, len, rtp_hevc_ctx->using_donl_field ? RTP_HEVC_DOND_FIELD_SIZE : 0, NULL, 0); if (res < 0) return res; break; /* fragmentation unit (FU) */ case 49: /* pass the HEVC payload header */ buf += RTP_HEVC_PAYLOAD_HEADER_SIZE; len -= RTP_HEVC_PAYLOAD_HEADER_SIZE; /* * decode the FU header * * 0 1 2 3 4 5 6 7 * +-+-+-+-+-+-+-+-+ * |S|E| FuType | * +---------------+ * * Start fragment (S): 1 bit * End fragment (E): 1 bit * FuType: 6 bits */ first_fragment = buf[0] & 0x80; last_fragment = buf[0] & 0x40; fu_type = buf[0] & 0x3f; /* pass the HEVC FU header */ buf += RTP_HEVC_FU_HEADER_SIZE; len -= RTP_HEVC_FU_HEADER_SIZE; /* pass the HEVC DONL field */ if (rtp_hevc_ctx->using_donl_field) { buf += RTP_HEVC_DONL_FIELD_SIZE; len -= RTP_HEVC_DONL_FIELD_SIZE; } av_log(ctx, AV_LOG_TRACE, " FU type %d with %d bytes\n", fu_type, len); if (len <= 0) { /* sanity check for size of input packet: 1 byte payload at least */ av_log(ctx, AV_LOG_ERROR, "Too short RTP/HEVC packet, got %d bytes of NAL unit type %d\n", len, nal_type); return AVERROR_INVALIDDATA; } if (first_fragment && last_fragment) { av_log(ctx, AV_LOG_ERROR, "Illegal combination of S and E bit in RTP/HEVC packet\n"); return AVERROR_INVALIDDATA; } new_nal_header[0] = (rtp_pl[0] & 0x81) | (fu_type << 1); new_nal_header[1] = rtp_pl[1]; res = ff_h264_handle_frag_packet(pkt, buf, len, first_fragment, new_nal_header, sizeof(new_nal_header)); break; /* PACI packet */ case 50: /* Temporal scalability control information (TSCI) */ avpriv_report_missing_feature(ctx, "PACI packets for RTP/HEVC"); res = AVERROR_PATCHWELCOME; break; } pkt->stream_index = st->index; return res; } RTPDynamicProtocolHandler ff_hevc_dynamic_handler = { .enc_name = "H265", .codec_type = AVMEDIA_TYPE_VIDEO, .codec_id = AV_CODEC_ID_HEVC, .need_parsing = AVSTREAM_PARSE_FULL, .priv_data_size = sizeof(PayloadContext), .parse_sdp_a_line = hevc_parse_sdp_line, .parse_packet = hevc_handle_packet, };