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120 lines
3.6 KiB
C
120 lines
3.6 KiB
C
/*
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* RTP packetization for MPEG video
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* Copyright (c) 2002 Fabrice Bellard
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* Copyright (c) 2007 Luca Abeni
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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 "libavcodec/mpegvideo.h"
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#include "avformat.h"
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#include "rtpenc.h"
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/* NOTE: a single frame must be passed with sequence header if
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needed. XXX: use slices. */
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void ff_rtp_send_mpegvideo(AVFormatContext *s1, const uint8_t *buf1, int size)
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{
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RTPMuxContext *s = s1->priv_data;
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int len, h, max_packet_size;
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uint8_t *q;
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const uint8_t *end = buf1 + size;
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int begin_of_slice, end_of_slice, frame_type, temporal_reference;
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max_packet_size = s->max_payload_size;
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begin_of_slice = 1;
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end_of_slice = 0;
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frame_type = 0;
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temporal_reference = 0;
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while (size > 0) {
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int begin_of_sequence;
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begin_of_sequence = 0;
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len = max_packet_size - 4;
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if (len >= size) {
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len = size;
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end_of_slice = 1;
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} else {
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const uint8_t *r, *r1;
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int start_code;
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r1 = buf1;
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while (1) {
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start_code = -1;
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r = ff_find_start_code(r1, end, &start_code);
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if((start_code & 0xFFFFFF00) == 0x100) {
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/* New start code found */
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if (start_code == 0x100) {
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frame_type = (r[1] & 0x38) >> 3;
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temporal_reference = (int)r[0] << 2 | r[1] >> 6;
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}
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if (start_code == 0x1B8) {
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begin_of_sequence = 1;
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}
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if (r - buf1 - 4 <= len) {
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/* The current slice fits in the packet */
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if (begin_of_slice == 0) {
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/* no slice at the beginning of the packet... */
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end_of_slice = 1;
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len = r - buf1 - 4;
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break;
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}
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r1 = r;
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} else {
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if ((r1 - buf1 > 4) && (r - r1 < max_packet_size)) {
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len = r1 - buf1 - 4;
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end_of_slice = 1;
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}
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break;
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}
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} else {
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break;
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}
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}
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}
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h = 0;
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h |= temporal_reference << 16;
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h |= begin_of_sequence << 13;
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h |= begin_of_slice << 12;
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h |= end_of_slice << 11;
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h |= frame_type << 8;
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q = s->buf;
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*q++ = h >> 24;
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*q++ = h >> 16;
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*q++ = h >> 8;
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*q++ = h;
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memcpy(q, buf1, len);
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q += len;
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/* 90kHz time stamp */
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s->timestamp = s->cur_timestamp;
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ff_rtp_send_data(s1, s->buf, q - s->buf, (len == size));
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buf1 += len;
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size -= len;
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begin_of_slice = end_of_slice;
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end_of_slice = 0;
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}
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}
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