| /* |
| * RTP parser for HEVC/H.265 payload format (draft version 6) |
| * Copyright (c) 2014 Thomas Volkert <thomas@homer-conferencing.com> |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg 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. |
| * |
| * FFmpeg 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 FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| * |
| */ |
| |
| #include "libavutil/avassert.h" |
| #include "libavutil/avstring.h" |
| #include "libavutil/base64.h" |
| #include "libavcodec/get_bits.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 RTP_HEVC_AP_NALU_LENGTH_FIELD_SIZE 2 |
| #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; |
| } else |
| av_assert0(0); |
| |
| 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; |
| AVCodecContext *codec; |
| const char *sdp_line_ptr = line; |
| |
| if (st_index < 0) |
| return 0; |
| |
| current_stream = ctx->streams[st_index]; |
| codec = current_stream->codec; |
| |
| if (av_strstart(sdp_line_ptr, "framesize:", &sdp_line_ptr)) { |
| ff_h264_parse_framesize(codec, 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(&codec->extradata); |
| codec->extradata_size = hevc_data->vps_size + hevc_data->sps_size + |
| hevc_data->pps_size + hevc_data->sei_size; |
| codec->extradata = av_malloc(codec->extradata_size + |
| AV_INPUT_BUFFER_PADDING_SIZE); |
| if (!codec->extradata) { |
| ret = AVERROR(ENOMEM); |
| codec->extradata_size = 0; |
| } else { |
| int pos = 0; |
| memcpy(codec->extradata + pos, hevc_data->vps, hevc_data->vps_size); |
| pos += hevc_data->vps_size; |
| memcpy(codec->extradata + pos, hevc_data->sps, hevc_data->sps_size); |
| pos += hevc_data->sps_size; |
| memcpy(codec->extradata + pos, hevc_data->pps, hevc_data->pps_size); |
| pos += hevc_data->pps_size; |
| memcpy(codec->extradata + pos, hevc_data->sei, hevc_data->sei_size); |
| pos += hevc_data->sei_size; |
| memset(codec->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, rtp_hevc_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); |
| |
| /* sanity check for size of input packet: 1 byte payload at least */ |
| if (len <= 0) { |
| if (len < 0) { |
| 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; |
| } else { |
| return AVERROR(EAGAIN); |
| } |
| } |
| |
| 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, |
| }; |
