mirror of
https://github.com/FFmpeg/FFmpeg.git
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129 lines
3.8 KiB
C
129 lines
3.8 KiB
C
/*
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* RTP Packetization of RAW video (RFC4175)
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* Copyright (c) 2021 Limin Wang
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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 "avformat.h"
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#include "rtpenc.h"
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void ff_rtp_send_raw_rfc4175(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 width = s1->streams[0]->codecpar->width;
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int height = s1->streams[0]->codecpar->height;
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int xinc, yinc, pgroup;
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int field = 0;
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int i = 0;
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int offset = 0;
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s->timestamp = s->cur_timestamp;
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switch (s1->streams[0]->codecpar->format) {
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case AV_PIX_FMT_UYVY422:
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xinc = yinc = 2;
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pgroup = 4;
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break;
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case AV_PIX_FMT_YUV422P10:
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xinc = yinc = 2;
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pgroup = 5;
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break;
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case AV_PIX_FMT_YUV420P:
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xinc = yinc = 4;
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pgroup = 6;
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break;
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case AV_PIX_FMT_RGB24:
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xinc = yinc = 1;
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pgroup = 3;
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break;
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case AV_PIX_FMT_BGR24:
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xinc = yinc = 1;
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pgroup = 3;
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break;
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default:
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return;
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}
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while (i < height) {
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int left = s->max_payload_size;
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uint8_t *dest = s->buf;
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uint8_t *headers;
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const int head_size = 6;
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int next_line;
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int length, cont, pixels;
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/* Extended Sequence Number */
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*dest++ = 0;
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*dest++ = 0;
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left -= 2;
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headers = dest;
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do {
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pixels = width * xinc - offset;
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length = (pixels * pgroup) / xinc;
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left -= head_size;
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if (left >= length) {
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next_line = 1;
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} else {
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pixels = (left / pgroup) * xinc;
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length = (pixels * pgroup) / xinc;
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next_line = 0;
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}
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left -= length;
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/* Length */
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*dest++ = (length >> 8) & 0xff;
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*dest++ = length & 0xff;
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/* Line No */
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*dest++ = ((i >> 8) & 0x7f) | ((field << 7) & 0x80);
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*dest++ = i & 0xff;
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if (next_line) i += yinc;
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cont = (left > (head_size + pgroup) && i < height) ? 0x80 : 0x00;
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/* Offset and Continuation marker */
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*dest++ = ((offset >> 8) & 0x7f) | cont;
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*dest++ = offset & 0xff;
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if (next_line)
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offset = 0;
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else
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offset += pixels;
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} while (cont);
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do {
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int l_line;
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int l_off;
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int copy_offset;
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length = (headers[0] << 8) | headers[1];
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l_line = ((headers[2] & 0x7f) << 8) | headers[3];
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l_off = ((headers[4] & 0x7f) << 8) | headers[5];
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cont = headers[4] & 0x80;
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headers += head_size;
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copy_offset = (l_line * width + l_off) * pgroup / xinc;
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if (copy_offset + length > size)
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break;
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memcpy (dest, buf + copy_offset, length);
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dest += length;
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} while (cont);
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ff_rtp_send_data (s1, s->buf, s->max_payload_size - left, i >= height);
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}
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}
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