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2ba45a60 DM |
1 | /* |
2 | * RTP packetization for H.261 video (RFC 4587) | |
3 | * Copyright (c) 2014 Thomas Volkert <thomas@homer-conferencing.com> | |
4 | * | |
5 | * This file is part of FFmpeg. | |
6 | * | |
7 | * FFmpeg is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU Lesser General Public | |
9 | * License as published by the Free Software Foundation; either | |
10 | * version 2.1 of the License, or (at your option) any later version. | |
11 | * | |
12 | * FFmpeg is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * Lesser General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU Lesser General Public | |
18 | * License along with FFmpeg; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
20 | */ | |
21 | ||
22 | #include "avformat.h" | |
23 | #include "rtpenc.h" | |
24 | ||
25 | void ff_rtp_send_h261(AVFormatContext *s1, const uint8_t *frame_buf, int frame_size) | |
26 | { | |
27 | RTPMuxContext *rtp_ctx = s1->priv_data; | |
28 | int processed_frame_size; | |
29 | int last_packet_of_frame; | |
30 | uint8_t *tmp_buf_ptr; | |
31 | ||
32 | /* use the default 90 KHz time stamp */ | |
33 | rtp_ctx->timestamp = rtp_ctx->cur_timestamp; | |
34 | ||
35 | /* continue as long as not all frame data is processed */ | |
36 | while (frame_size > 0) { | |
37 | tmp_buf_ptr = rtp_ctx->buf; | |
38 | *tmp_buf_ptr++ = 1; /* V=1 */ | |
39 | *tmp_buf_ptr++ = 0; | |
40 | *tmp_buf_ptr++ = 0; | |
41 | *tmp_buf_ptr++ = 0; | |
42 | ||
43 | processed_frame_size = FFMIN(rtp_ctx->max_payload_size - 4, frame_size); | |
44 | ||
45 | //XXX: parse the h.261 bitstream and improve frame splitting here | |
46 | ||
47 | last_packet_of_frame = (processed_frame_size == frame_size); | |
48 | ||
49 | memcpy(tmp_buf_ptr, frame_buf, processed_frame_size); | |
50 | tmp_buf_ptr += processed_frame_size; | |
51 | ||
52 | ff_rtp_send_data(s1, rtp_ctx->buf, tmp_buf_ptr - rtp_ctx->buf, last_packet_of_frame); | |
53 | ||
54 | frame_buf += processed_frame_size; | |
55 | frame_size -= processed_frame_size; | |
56 | } | |
57 | } |