131 lines
4.4 KiB
C
131 lines
4.4 KiB
C
/*
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* RTP packetizer 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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#include "avc.h"
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#include "avformat.h"
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#include "rtpenc.h"
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#define RTP_HEVC_HEADERS_SIZE 3
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static void nal_send(AVFormatContext *ctx, const uint8_t *buf, int len, int last_packet_of_frame)
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{
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RTPMuxContext *rtp_ctx = ctx->priv_data;
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int rtp_payload_size = rtp_ctx->max_payload_size - RTP_HEVC_HEADERS_SIZE;
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int nal_type = (buf[0] >> 1) & 0x3F;
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/* send it as one single NAL unit? */
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if (len <= rtp_ctx->max_payload_size) {
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/* use the original NAL unit buffer and transmit it as RTP payload */
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ff_rtp_send_data(ctx, buf, len, last_packet_of_frame);
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} else {
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/*
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create the HEVC payload header and transmit the buffer as fragmentation units (FU)
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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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F = 0
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Type = 49 (fragmentation unit (FU))
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LayerId = 0
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TID = 1
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*/
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rtp_ctx->buf[0] = 49 << 1;
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rtp_ctx->buf[1] = 1;
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/*
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create 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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S = variable
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E = variable
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FuType = NAL unit type
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*/
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rtp_ctx->buf[2] = nal_type;
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/* set the S bit: mark as start fragment */
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rtp_ctx->buf[2] |= 1 << 7;
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/* pass the original NAL header */
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buf += 2;
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len -= 2;
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while (len > rtp_payload_size) {
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/* complete and send current RTP packet */
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memcpy(&rtp_ctx->buf[RTP_HEVC_HEADERS_SIZE], buf, rtp_payload_size);
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ff_rtp_send_data(ctx, rtp_ctx->buf, rtp_ctx->max_payload_size, 0);
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buf += rtp_payload_size;
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len -= rtp_payload_size;
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/* reset the S bit */
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rtp_ctx->buf[2] &= ~(1 << 7);
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}
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/* set the E bit: mark as last fragment */
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rtp_ctx->buf[2] |= 1 << 6;
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/* complete and send last RTP packet */
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memcpy(&rtp_ctx->buf[RTP_HEVC_HEADERS_SIZE], buf, len);
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ff_rtp_send_data(ctx, rtp_ctx->buf, len + 2, last_packet_of_frame);
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}
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}
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void ff_rtp_send_hevc(AVFormatContext *ctx, const uint8_t *frame_buf, int frame_size)
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{
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const uint8_t *next_NAL_unit;
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const uint8_t *buf_ptr, *buf_end = frame_buf + frame_size;
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RTPMuxContext *rtp_ctx = ctx->priv_data;
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/* use the default 90 KHz time stamp */
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rtp_ctx->timestamp = rtp_ctx->cur_timestamp;
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if (rtp_ctx->nal_length_size)
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buf_ptr = ff_avc_mp4_find_startcode(frame_buf, buf_end, rtp_ctx->nal_length_size) ? frame_buf : buf_end;
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else
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buf_ptr = ff_avc_find_startcode(frame_buf, buf_end);
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/* find all NAL units and send them as separate packets */
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while (buf_ptr < buf_end) {
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if (rtp_ctx->nal_length_size) {
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next_NAL_unit = ff_avc_mp4_find_startcode(buf_ptr, buf_end, rtp_ctx->nal_length_size);
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if (!next_NAL_unit)
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next_NAL_unit = buf_end;
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buf_ptr += rtp_ctx->nal_length_size;
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} else {
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while (!*(buf_ptr++))
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;
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next_NAL_unit = ff_avc_find_startcode(buf_ptr, buf_end);
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}
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/* send the next NAL unit */
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nal_send(ctx, buf_ptr, next_NAL_unit - buf_ptr, next_NAL_unit == buf_end);
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/* jump to the next NAL unit */
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buf_ptr = next_NAL_unit;
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}
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}
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