| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * RTP packetization for AMR audio | ||
| 3 | * Copyright (c) 2007 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 | /** | ||
| 27 | * Packetize AMR frames into RTP packets according to RFC 3267, | ||
| 28 | * in octet-aligned mode. | ||
| 29 | */ | ||
| 30 | ✗ | void ff_rtp_send_amr(AVFormatContext *s1, const uint8_t *buff, int size) | |
| 31 | { | ||
| 32 | ✗ | RTPMuxContext *s = s1->priv_data; | |
| 33 | ✗ | AVStream *st = s1->streams[0]; | |
| 34 | ✗ | int max_header_toc_size = 1 + s->max_frames_per_packet; | |
| 35 | uint8_t *p; | ||
| 36 | int len; | ||
| 37 | ✗ | int max_size = st->codecpar->codec_id == AV_CODEC_ID_AMR_NB ? 32 : 61; | |
| 38 | |||
| 39 | ✗ | if (size < 1 || size > max_size) | |
| 40 | ✗ | return; | |
| 41 | |||
| 42 | /* Test if the packet must be sent. */ | ||
| 43 | ✗ | len = s->buf_ptr - s->buf; | |
| 44 | ✗ | if (s->num_frames && | |
| 45 | ✗ | (s->num_frames == s->max_frames_per_packet || | |
| 46 | ✗ | len + size - 1 > s->max_payload_size || | |
| 47 | ✗ | av_compare_ts(s->cur_timestamp - s->timestamp, st->time_base, | |
| 48 | ✗ | s1->max_delay, AV_TIME_BASE_Q) >= 0)) { | |
| 49 | ✗ | int header_size = s->num_frames + 1; | |
| 50 | ✗ | p = s->buf + max_header_toc_size - header_size; | |
| 51 | ✗ | if (p != s->buf) | |
| 52 | ✗ | memmove(p, s->buf, header_size); | |
| 53 | |||
| 54 | ✗ | ff_rtp_send_data(s1, p, s->buf_ptr - p, 1); | |
| 55 | |||
| 56 | ✗ | s->num_frames = 0; | |
| 57 | } | ||
| 58 | |||
| 59 | ✗ | if (!s->num_frames) { | |
| 60 | ✗ | s->buf[0] = 0xf0; | |
| 61 | ✗ | s->buf_ptr = s->buf + max_header_toc_size; | |
| 62 | ✗ | s->timestamp = s->cur_timestamp; | |
| 63 | } else { | ||
| 64 | /* Mark the previous TOC entry as having more entries following. */ | ||
| 65 | ✗ | s->buf[1 + s->num_frames - 1] |= 0x80; | |
| 66 | } | ||
| 67 | |||
| 68 | /* Copy the frame type and quality bits. */ | ||
| 69 | ✗ | s->buf[1 + s->num_frames++] = buff[0] & 0x7C; | |
| 70 | ✗ | buff++; | |
| 71 | ✗ | size--; | |
| 72 | ✗ | memcpy(s->buf_ptr, buff, size); | |
| 73 | ✗ | s->buf_ptr += size; | |
| 74 | } | ||
| 75 |