yading@11: /*
yading@11:  * RTP packetization for MPEG video
yading@11:  * Copyright (c) 2002 Fabrice Bellard
yading@11:  * Copyright (c) 2007 Luca Abeni
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: #include "libavcodec/internal.h"
yading@11: #include "avformat.h"
yading@11: #include "rtpenc.h"
yading@11: 
yading@11: /* NOTE: a single frame must be passed with sequence header if
yading@11:    needed. XXX: use slices. */
yading@11: void ff_rtp_send_mpegvideo(AVFormatContext *s1, const uint8_t *buf1, int size)
yading@11: {
yading@11:     RTPMuxContext *s = s1->priv_data;
yading@11:     int len, h, max_packet_size;
yading@11:     uint8_t *q;
yading@11:     const uint8_t *end = buf1 + size;
yading@11:     int begin_of_slice, end_of_slice, frame_type, temporal_reference;
yading@11: 
yading@11:     max_packet_size = s->max_payload_size;
yading@11:     begin_of_slice = 1;
yading@11:     end_of_slice = 0;
yading@11:     frame_type = 0;
yading@11:     temporal_reference = 0;
yading@11: 
yading@11:     while (size > 0) {
yading@11:         int begin_of_sequence;
yading@11: 
yading@11:         begin_of_sequence = 0;
yading@11:         len = max_packet_size - 4;
yading@11: 
yading@11:         if (len >= size) {
yading@11:             len = size;
yading@11:             end_of_slice = 1;
yading@11:         } else {
yading@11:             const uint8_t *r, *r1;
yading@11:             int start_code;
yading@11: 
yading@11:             r1 = buf1;
yading@11:             while (1) {
yading@11:                 start_code = -1;
yading@11:                 r = avpriv_find_start_code(r1, end, &start_code);
yading@11:                 if((start_code & 0xFFFFFF00) == 0x100) {
yading@11:                     /* New start code found */
yading@11:                     if (start_code == 0x100) {
yading@11:                         frame_type = (r[1] & 0x38) >> 3;
yading@11:                         temporal_reference = (int)r[0] << 2 | r[1] >> 6;
yading@11:                     }
yading@11:                     if (start_code == 0x1B8) {
yading@11:                         begin_of_sequence = 1;
yading@11:                     }
yading@11: 
yading@11:                     if (r - buf1 - 4 <= len) {
yading@11:                         /* The current slice fits in the packet */
yading@11:                         if (begin_of_slice == 0) {
yading@11:                             /* no slice at the beginning of the packet... */
yading@11:                             end_of_slice = 1;
yading@11:                             len = r - buf1 - 4;
yading@11:                             break;
yading@11:                         }
yading@11:                         r1 = r;
yading@11:                     } else {
yading@11:                         if ((r1 - buf1 > 4) && (r - r1 < max_packet_size)) {
yading@11:                             len = r1 - buf1 - 4;
yading@11:                             end_of_slice = 1;
yading@11:                         }
yading@11:                         break;
yading@11:                     }
yading@11:                 } else {
yading@11:                     break;
yading@11:                 }
yading@11:             }
yading@11:         }
yading@11: 
yading@11:         h = 0;
yading@11:         h |= temporal_reference << 16;
yading@11:         h |= begin_of_sequence << 13;
yading@11:         h |= begin_of_slice << 12;
yading@11:         h |= end_of_slice << 11;
yading@11:         h |= frame_type << 8;
yading@11: 
yading@11:         q = s->buf;
yading@11:         *q++ = h >> 24;
yading@11:         *q++ = h >> 16;
yading@11:         *q++ = h >> 8;
yading@11:         *q++ = h;
yading@11: 
yading@11:         memcpy(q, buf1, len);
yading@11:         q += len;
yading@11: 
yading@11:         /* 90kHz time stamp */
yading@11:         s->timestamp = s->cur_timestamp;
yading@11:         ff_rtp_send_data(s1, s->buf, q - s->buf, (len == size));
yading@11: 
yading@11:         buf1 += len;
yading@11:         size -= len;
yading@11:         begin_of_slice = end_of_slice;
yading@11:         end_of_slice = 0;
yading@11:     }
yading@11: }