| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * RTP packetization for H.263 video | ||
| 3 | * Copyright (c) 2009 Luca Abeni | ||
| 4 | * Copyright (c) 2009 Martin Storsjo | ||
| 5 | * | ||
| 6 | * This file is part of FFmpeg. | ||
| 7 | * | ||
| 8 | * FFmpeg is free software; you can redistribute it and/or | ||
| 9 | * modify it under the terms of the GNU Lesser General Public | ||
| 10 | * License as published by the Free Software Foundation; either | ||
| 11 | * version 2.1 of the License, or (at your option) any later version. | ||
| 12 | * | ||
| 13 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 16 | * Lesser General Public License for more details. | ||
| 17 | * | ||
| 18 | * You should have received a copy of the GNU Lesser General Public | ||
| 19 | * License along with FFmpeg; if not, write to the Free Software | ||
| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 21 | */ | ||
| 22 | |||
| 23 | #include "avformat.h" | ||
| 24 | #include "rtpenc.h" | ||
| 25 | |||
| 26 | ✗ | const uint8_t *ff_h263_find_resync_marker_reverse(const uint8_t *restrict start, | |
| 27 | const uint8_t *restrict end) | ||
| 28 | { | ||
| 29 | ✗ | const uint8_t *p = end - 1; | |
| 30 | ✗ | start += 1; /* Make sure we never return the original start. */ | |
| 31 | ✗ | for (; p > start; p -= 2) { | |
| 32 | ✗ | if (!*p) { | |
| 33 | ✗ | if (!p[ 1] && p[2]) return p; | |
| 34 | ✗ | else if (!p[-1] && p[1]) return p - 1; | |
| 35 | } | ||
| 36 | } | ||
| 37 | ✗ | return end; | |
| 38 | } | ||
| 39 | |||
| 40 | /** | ||
| 41 | * Packetize H.263 frames into RTP packets according to RFC 4629 | ||
| 42 | */ | ||
| 43 | ✗ | void ff_rtp_send_h263(AVFormatContext *s1, const uint8_t *buf1, int size) | |
| 44 | { | ||
| 45 | ✗ | RTPMuxContext *s = s1->priv_data; | |
| 46 | int len, max_packet_size; | ||
| 47 | uint8_t *q; | ||
| 48 | |||
| 49 | ✗ | max_packet_size = s->max_payload_size; | |
| 50 | |||
| 51 | ✗ | while (size > 0) { | |
| 52 | ✗ | q = s->buf; | |
| 53 | ✗ | if (size >= 2 && (buf1[0] == 0) && (buf1[1] == 0)) { | |
| 54 | ✗ | *q++ = 0x04; | |
| 55 | ✗ | buf1 += 2; | |
| 56 | ✗ | size -= 2; | |
| 57 | } else { | ||
| 58 | ✗ | *q++ = 0; | |
| 59 | } | ||
| 60 | ✗ | *q++ = 0; | |
| 61 | |||
| 62 | ✗ | len = FFMIN(max_packet_size - 2, size); | |
| 63 | |||
| 64 | /* Look for a better place to split the frame into packets. */ | ||
| 65 | ✗ | if (len < size) { | |
| 66 | ✗ | const uint8_t *end = ff_h263_find_resync_marker_reverse(buf1, | |
| 67 | buf1 + len); | ||
| 68 | ✗ | len = end - buf1; | |
| 69 | } | ||
| 70 | |||
| 71 | ✗ | memcpy(q, buf1, len); | |
| 72 | ✗ | q += len; | |
| 73 | |||
| 74 | /* 90 KHz time stamp */ | ||
| 75 | ✗ | s->timestamp = s->cur_timestamp; | |
| 76 | ✗ | ff_rtp_send_data(s1, s->buf, q - s->buf, (len == size)); | |
| 77 | |||
| 78 | ✗ | buf1 += len; | |
| 79 | ✗ | size -= len; | |
| 80 | } | ||
| 81 | ✗ | } | |
| 82 |