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361 lines
12 KiB
361 lines
12 KiB
/* |
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* RTP parser for HEVC/H.265 payload format (draft version 6) |
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* Copyright (c) 2014 Thomas Volkert <thomas@homer-conferencing.com> |
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* |
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* This file is part of Libav. |
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* |
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* Libav is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* Libav is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with Libav; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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* |
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*/ |
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#include "libavutil/avstring.h" |
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#include "avformat.h" |
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#include "rtpdec.h" |
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#define RTP_HEVC_PAYLOAD_HEADER_SIZE 2 |
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#define RTP_HEVC_FU_HEADER_SIZE 1 |
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#define RTP_HEVC_DONL_FIELD_SIZE 2 |
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#define HEVC_SPECIFIED_NAL_UNIT_TYPES 48 |
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/* SDP out-of-band signaling data */ |
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struct PayloadContext { |
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int using_donl_field; |
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int profile_id; |
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}; |
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static const uint8_t start_sequence[] = { 0x00, 0x00, 0x00, 0x01 }; |
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static av_cold PayloadContext *hevc_new_context(void) |
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{ |
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return av_mallocz(sizeof(PayloadContext)); |
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} |
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static av_cold void hevc_free_context(PayloadContext *data) |
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{ |
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av_free(data); |
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} |
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static av_cold int hevc_init(AVFormatContext *ctx, int st_index, |
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PayloadContext *data) |
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{ |
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av_dlog(ctx, "hevc_init() for stream %d\n", st_index); |
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if (st_index < 0) |
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return 0; |
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ctx->streams[st_index]->need_parsing = AVSTREAM_PARSE_FULL; |
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return 0; |
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} |
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static av_cold int hevc_sdp_parse_fmtp_config(AVFormatContext *s, |
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AVStream *stream, |
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PayloadContext *hevc_data, |
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char *attr, char *value) |
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{ |
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/* profile-space: 0-3 */ |
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/* profile-id: 0-31 */ |
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if (!strcmp(attr, "profile-id")) { |
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hevc_data->profile_id = atoi(value); |
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av_dlog(s, "SDP: found profile-id: %d\n", hevc_data->profile_id); |
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} |
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/* tier-flag: 0-1 */ |
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/* level-id: 0-255 */ |
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/* interop-constraints: [base16] */ |
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/* profile-compatibility-indicator: [base16] */ |
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/* sprop-sub-layer-id: 0-6, defines highest possible value for TID, default: 6 */ |
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/* recv-sub-layer-id: 0-6 */ |
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/* max-recv-level-id: 0-255 */ |
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/* tx-mode: MSM,SSM */ |
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/* sprop-vps: [base64] */ |
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/* sprop-sps: [base64] */ |
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/* sprop-pps: [base64] */ |
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/* sprop-sei: [base64] */ |
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/* max-lsr, max-lps, max-cpb, max-dpb, max-br, max-tr, max-tc */ |
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/* max-fps */ |
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/* sprop-max-don-diff: 0-32767 |
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When the RTP stream depends on one or more other RTP |
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streams (in this case tx-mode MUST be equal to "MSM" and |
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MSM is in use), this parameter MUST be present and the |
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value MUST be greater than 0. |
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*/ |
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if (!strcmp(attr, "sprop-max-don-diff")) { |
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if (atoi(value) > 0) |
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hevc_data->using_donl_field = 1; |
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av_dlog(s, "Found sprop-max-don-diff in SDP, DON field usage is: %d\n", |
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hevc_data->using_donl_field); |
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} |
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/* sprop-depack-buf-nalus: 0-32767 */ |
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if (!strcmp(attr, "sprop-depack-buf-nalus")) { |
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if (atoi(value) > 0) |
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hevc_data->using_donl_field = 1; |
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av_dlog(s, "Found sprop-depack-buf-nalus in SDP, DON field usage is: %d\n", |
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hevc_data->using_donl_field); |
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} |
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/* sprop-depack-buf-bytes: 0-4294967295 */ |
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/* depack-buf-cap */ |
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/* sprop-segmentation-id: 0-3 */ |
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/* sprop-spatial-segmentation-idc: [base16] */ |
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/* dec-parallel-ca: */ |
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/* include-dph */ |
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return 0; |
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} |
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static av_cold int hevc_parse_sdp_line(AVFormatContext *ctx, int st_index, |
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PayloadContext *hevc_data, const char *line) |
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{ |
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AVStream *current_stream; |
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AVCodecContext *codec; |
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const char *sdp_line_ptr = line; |
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if (st_index < 0) |
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return 0; |
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current_stream = ctx->streams[st_index]; |
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codec = current_stream->codec; |
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if (av_strstart(sdp_line_ptr, "framesize:", &sdp_line_ptr)) { |
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char str_video_width[50]; |
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char *str_video_width_ptr = str_video_width; |
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/* |
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* parse "a=framesize:96 320-240" |
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*/ |
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/* ignore spaces */ |
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while (*sdp_line_ptr && *sdp_line_ptr == ' ') |
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sdp_line_ptr++; |
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/* ignore RTP payload ID */ |
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while (*sdp_line_ptr && *sdp_line_ptr != ' ') |
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sdp_line_ptr++; |
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/* ignore spaces */ |
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while (*sdp_line_ptr && *sdp_line_ptr == ' ') |
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sdp_line_ptr++; |
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/* extract the actual video resolution description */ |
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while (*sdp_line_ptr && *sdp_line_ptr != '-' && |
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(str_video_width_ptr - str_video_width) < sizeof(str_video_width) - 1) |
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*str_video_width_ptr++ = *sdp_line_ptr++; |
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/* add trailing zero byte */ |
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*str_video_width_ptr = '\0'; |
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/* determine the width value */ |
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codec->width = atoi(str_video_width); |
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/* jump beyond the "-" and determine the height value */ |
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codec->height = atoi(sdp_line_ptr + 1); |
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} else if (av_strstart(sdp_line_ptr, "fmtp:", &sdp_line_ptr)) { |
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return ff_parse_fmtp(ctx, current_stream, hevc_data, sdp_line_ptr, |
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hevc_sdp_parse_fmtp_config); |
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} |
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return 0; |
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} |
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static int hevc_handle_packet(AVFormatContext *ctx, PayloadContext *rtp_hevc_ctx, |
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AVStream *st, AVPacket *pkt, uint32_t *timestamp, |
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const uint8_t *buf, int len, uint16_t seq, |
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int flags) |
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{ |
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const uint8_t *rtp_pl = buf; |
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int tid, lid, nal_type; |
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int first_fragment, last_fragment, fu_type; |
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uint8_t new_nal_header[2]; |
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int res = 0; |
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/* sanity check for size of input packet: 1 byte payload at least */ |
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if (len < RTP_HEVC_PAYLOAD_HEADER_SIZE + 1) { |
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av_log(ctx, AV_LOG_ERROR, "Too short RTP/HEVC packet, got %d bytes\n", len); |
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return AVERROR_INVALIDDATA; |
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} |
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/* |
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decode the HEVC payload header according to section 4 of draft version 6: |
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0 1 |
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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|F| Type | LayerId | TID | |
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+-------------+-----------------+ |
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Forbidden zero (F): 1 bit |
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NAL unit type (Type): 6 bits |
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NUH layer ID (LayerId): 6 bits |
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NUH temporal ID plus 1 (TID): 3 bits |
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*/ |
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nal_type = (buf[0] >> 1) & 0x3f; |
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lid = ((buf[0] << 5) & 0x20) | ((buf[1] >> 3) & 0x1f); |
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tid = buf[1] & 0x07; |
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/* sanity check for correct layer ID */ |
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if (lid) { |
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/* future scalable or 3D video coding extensions */ |
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avpriv_report_missing_feature(ctx, "Multi-layer HEVC coding\n"); |
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return AVERROR_PATCHWELCOME; |
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} |
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/* sanity check for correct temporal ID */ |
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if (!tid) { |
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av_log(ctx, AV_LOG_ERROR, "Illegal temporal ID in RTP/HEVC packet\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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/* sanity check for correct NAL unit type */ |
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if (nal_type > 50) { |
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av_log(ctx, AV_LOG_ERROR, "Unsupported (HEVC) NAL type (%d)\n", nal_type); |
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return AVERROR_INVALIDDATA; |
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} |
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switch (nal_type) { |
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/* aggregated packets (AP) */ |
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case 48: |
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/* pass the HEVC payload header */ |
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buf += RTP_HEVC_PAYLOAD_HEADER_SIZE; |
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len -= RTP_HEVC_PAYLOAD_HEADER_SIZE; |
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/* pass the HEVC DONL field */ |
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if (rtp_hevc_ctx->using_donl_field) { |
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buf += RTP_HEVC_DONL_FIELD_SIZE; |
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len -= RTP_HEVC_DONL_FIELD_SIZE; |
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} |
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/* fall-through */ |
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/* video parameter set (VPS) */ |
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case 32: |
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/* sequence parameter set (SPS) */ |
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case 33: |
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/* picture parameter set (PPS) */ |
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case 34: |
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/* supplemental enhancement information (SEI) */ |
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case 39: |
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/* single NAL unit packet */ |
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default: |
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/* sanity check for size of input packet: 1 byte payload at least */ |
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if (len < 1) { |
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av_log(ctx, AV_LOG_ERROR, |
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"Too short RTP/HEVC packet, got %d bytes of NAL unit type %d\n", |
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len, nal_type); |
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return AVERROR_INVALIDDATA; |
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} |
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/* create A/V packet */ |
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if ((res = av_new_packet(pkt, sizeof(start_sequence) + len)) < 0) |
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return res; |
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/* A/V packet: copy start sequence */ |
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memcpy(pkt->data, start_sequence, sizeof(start_sequence)); |
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/* A/V packet: copy NAL unit data */ |
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memcpy(pkt->data + sizeof(start_sequence), buf, len); |
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break; |
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/* fragmentation unit (FU) */ |
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case 49: |
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/* pass the HEVC payload header */ |
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buf += RTP_HEVC_PAYLOAD_HEADER_SIZE; |
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len -= RTP_HEVC_PAYLOAD_HEADER_SIZE; |
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if (len < 1) |
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return AVERROR_INVALIDDATA; |
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/* |
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decode the FU header |
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0 1 2 3 4 5 6 7 |
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+-+-+-+-+-+-+-+-+ |
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|S|E| FuType | |
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+---------------+ |
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Start fragment (S): 1 bit |
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End fragment (E): 1 bit |
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FuType: 6 bits |
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*/ |
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first_fragment = buf[0] & 0x80; |
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last_fragment = buf[0] & 0x40; |
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fu_type = buf[0] & 0x3f; |
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/* pass the HEVC FU header */ |
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buf += RTP_HEVC_FU_HEADER_SIZE; |
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len -= RTP_HEVC_FU_HEADER_SIZE; |
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/* pass the HEVC DONL field */ |
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if (rtp_hevc_ctx->using_donl_field) { |
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buf += RTP_HEVC_DONL_FIELD_SIZE; |
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len -= RTP_HEVC_DONL_FIELD_SIZE; |
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} |
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av_dlog(ctx, " FU type %d with %d bytes\n", fu_type, len); |
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if (len > 0) { |
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new_nal_header[0] = (rtp_pl[0] & 0x81) | (fu_type << 1); |
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new_nal_header[1] = rtp_pl[1]; |
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/* start fragment vs. subsequent fragments */ |
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if (first_fragment) { |
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if (!last_fragment) { |
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/* create A/V packet which is big enough */ |
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if ((res = av_new_packet(pkt, sizeof(start_sequence) + sizeof(new_nal_header) + len)) < 0) |
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return res; |
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/* A/V packet: copy start sequence */ |
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memcpy(pkt->data, start_sequence, sizeof(start_sequence)); |
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/* A/V packet: copy new NAL header */ |
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memcpy(pkt->data + sizeof(start_sequence), new_nal_header, sizeof(new_nal_header)); |
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/* A/V packet: copy NAL unit data */ |
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memcpy(pkt->data + sizeof(start_sequence) + sizeof(new_nal_header), buf, len); |
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} else { |
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av_log(ctx, AV_LOG_ERROR, "Illegal combination of S and E bit in RTP/HEVC packet\n"); |
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res = AVERROR_INVALIDDATA; |
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} |
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} else { |
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/* create A/V packet */ |
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if ((res = av_new_packet(pkt, len)) < 0) |
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return res; |
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/* A/V packet: copy NAL unit data */ |
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memcpy(pkt->data, buf, len); |
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} |
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} else { |
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/* sanity check for size of input packet: 1 byte payload at least */ |
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av_log(ctx, AV_LOG_ERROR, |
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"Too short RTP/HEVC packet, got %d bytes of NAL unit type %d\n", |
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len, nal_type); |
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res = AVERROR_INVALIDDATA; |
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} |
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break; |
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/* PACI packet */ |
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case 50: |
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/* Temporal scalability control information (TSCI) */ |
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avpriv_report_missing_feature(ctx, "PACI packets for RTP/HEVC\n"); |
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res = AVERROR_PATCHWELCOME; |
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break; |
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} |
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pkt->stream_index = st->index; |
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return res; |
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} |
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RTPDynamicProtocolHandler ff_hevc_dynamic_handler = { |
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.enc_name = "H265", |
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.codec_type = AVMEDIA_TYPE_VIDEO, |
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.codec_id = AV_CODEC_ID_HEVC, |
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.init = hevc_init, |
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.parse_sdp_a_line = hevc_parse_sdp_line, |
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.alloc = hevc_new_context, |
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.free = hevc_free_context, |
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.parse_packet = hevc_handle_packet |
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};
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