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8ae15b5655
7-bit PictureIDs are not supported by WebRTC: https://groups.google.com/g/discuss-webrtc/c/333-L02vuWA In practice, 15-bit PictureIDs offer better compatibility. Signed-off-by: Kevin Wang <kevin@muxable.com> Signed-off-by: Martin Storsjö <martin@martin.st>
57 lines
1.9 KiB
C
57 lines
1.9 KiB
C
/*
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* RTP VP8 Packetizer
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* Copyright (c) 2010 Josh Allmann
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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 "rtpenc.h"
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/* Based on a draft spec for VP8 RTP.
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* ( http://tools.ietf.org/html/draft-ietf-payload-vp8-05 ) */
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void ff_rtp_send_vp8(AVFormatContext *s1, const uint8_t *buf, int size)
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{
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RTPMuxContext *s = s1->priv_data;
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int len, max_packet_size, header_size;
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s->buf_ptr = s->buf;
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s->timestamp = s->cur_timestamp;
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// extended control bit set, reference frame, start of partition,
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// partition id 0
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*s->buf_ptr++ = 0x90;
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*s->buf_ptr++ = 0x80; // Picture id present
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*s->buf_ptr++ = ((s->frame_count & 0x7f00) >> 8) | 0x80;
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*s->buf_ptr++ = s->frame_count++ & 0xff;
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// Calculate the number of remaining bytes
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header_size = s->buf_ptr - s->buf;
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max_packet_size = s->max_payload_size - header_size;
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while (size > 0) {
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len = FFMIN(size, max_packet_size);
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memcpy(s->buf_ptr, buf, len);
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// marker bit is last packet in frame
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ff_rtp_send_data(s1, s->buf, len + header_size, size == len);
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size -= len;
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buf += len;
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// Clear the partition start bit, keep the rest of the header untouched
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s->buf[0] &= ~0x10;
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}
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}
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