352 lines
12 KiB
C
Executable File
352 lines
12 KiB
C
Executable File
/*
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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 FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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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#include "libavutil/avassert.h"
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#include "libavutil/avstring.h"
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#include "libavutil/base64.h"
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#include "libavcodec/get_bits.h"
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#include "avformat.h"
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#include "internal.h"
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#include "rtpdec.h"
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#include "rtpdec_formats.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 RTP_HEVC_DOND_FIELD_SIZE 1
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#define RTP_HEVC_AP_NALU_LENGTH_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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uint8_t *sps, *pps, *vps, *sei;
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int sps_size, pps_size, vps_size, sei_size;
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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 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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const char *attr, const 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_log(s, AV_LOG_TRACE, "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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if (!strcmp(attr, "sprop-vps") || !strcmp(attr, "sprop-sps") ||
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!strcmp(attr, "sprop-pps") || !strcmp(attr, "sprop-sei")) {
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uint8_t **data_ptr = NULL;
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int *size_ptr = NULL;
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if (!strcmp(attr, "sprop-vps")) {
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data_ptr = &hevc_data->vps;
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size_ptr = &hevc_data->vps_size;
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} else if (!strcmp(attr, "sprop-sps")) {
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data_ptr = &hevc_data->sps;
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size_ptr = &hevc_data->sps_size;
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} else if (!strcmp(attr, "sprop-pps")) {
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data_ptr = &hevc_data->pps;
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size_ptr = &hevc_data->pps_size;
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} else if (!strcmp(attr, "sprop-sei")) {
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data_ptr = &hevc_data->sei;
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size_ptr = &hevc_data->sei_size;
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} else
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av_assert0(0);
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ff_h264_parse_sprop_parameter_sets(s, data_ptr,
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size_ptr, value);
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}
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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_log(s, AV_LOG_TRACE, "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_log(s, AV_LOG_TRACE, "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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AVCodecParameters *par;
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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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par = current_stream->codecpar;
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if (av_strstart(sdp_line_ptr, "framesize:", &sdp_line_ptr)) {
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ff_h264_parse_framesize(par, sdp_line_ptr);
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} else if (av_strstart(sdp_line_ptr, "fmtp:", &sdp_line_ptr)) {
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int ret = ff_parse_fmtp(ctx, current_stream, hevc_data, sdp_line_ptr,
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hevc_sdp_parse_fmtp_config);
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if (hevc_data->vps_size || hevc_data->sps_size ||
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hevc_data->pps_size || hevc_data->sei_size) {
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par->extradata_size = hevc_data->vps_size + hevc_data->sps_size +
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hevc_data->pps_size + hevc_data->sei_size;
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if ((ret = ff_alloc_extradata(par, par->extradata_size)) >= 0) {
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int pos = 0;
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memcpy(par->extradata + pos, hevc_data->vps, hevc_data->vps_size);
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pos += hevc_data->vps_size;
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memcpy(par->extradata + pos, hevc_data->sps, hevc_data->sps_size);
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pos += hevc_data->sps_size;
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memcpy(par->extradata + pos, hevc_data->pps, hevc_data->pps_size);
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pos += hevc_data->pps_size;
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memcpy(par->extradata + pos, hevc_data->sei, hevc_data->sei_size);
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}
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av_freep(&hevc_data->vps);
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av_freep(&hevc_data->sps);
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av_freep(&hevc_data->pps);
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av_freep(&hevc_data->sei);
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hevc_data->vps_size = 0;
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hevc_data->sps_size = 0;
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hevc_data->pps_size = 0;
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hevc_data->sei_size = 0;
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}
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return ret;
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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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*
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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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*
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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");
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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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/* 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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/* 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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/* aggregated packet (AP) - with two or more NAL units */
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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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res = ff_h264_handle_aggregated_packet(ctx, rtp_hevc_ctx, pkt, buf, len,
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rtp_hevc_ctx->using_donl_field ?
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RTP_HEVC_DOND_FIELD_SIZE : 0,
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NULL, 0);
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if (res < 0)
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return res;
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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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/*
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* decode the FU header
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*
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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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*
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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_log(ctx, AV_LOG_TRACE, " FU type %d with %d bytes\n", fu_type, len);
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/* sanity check for size of input packet: 1 byte payload at least */
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if (len <= 0) {
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if (len < 0) {
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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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} else {
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return AVERROR(EAGAIN);
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}
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}
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if (first_fragment && last_fragment) {
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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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return AVERROR_INVALIDDATA;
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}
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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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res = ff_h264_handle_frag_packet(pkt, buf, len, first_fragment,
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new_nal_header, sizeof(new_nal_header));
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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");
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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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const 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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.need_parsing = AVSTREAM_PARSE_FULL,
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.priv_data_size = sizeof(PayloadContext),
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.parse_sdp_a_line = hevc_parse_sdp_line,
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.parse_packet = hevc_handle_packet,
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};
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