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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 6148 | serge | 1 | /* |
| 2 | * RTP packetization for AMR audio |
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| 3 | * Copyright (c) 2007 Luca Abeni |
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| 4 | * Copyright (c) 2009 Martin Storsjo |
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| 5 | * |
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| 6 | * This file is part of FFmpeg. |
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| 7 | * |
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| 8 | * FFmpeg is free software; you can redistribute it and/or |
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| 9 | * modify it under the terms of the GNU Lesser General Public |
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| 10 | * License as published by the Free Software Foundation; either |
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| 11 | * version 2.1 of the License, or (at your option) any later version. |
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| 12 | * |
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| 13 | * FFmpeg is distributed in the hope that it will be useful, |
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| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 16 | * Lesser General Public License for more details. |
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| 17 | * |
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| 18 | * You should have received a copy of the GNU Lesser General Public |
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| 19 | * License along with FFmpeg; if not, write to the Free Software |
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| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 21 | */ |
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| 22 | |||
| 23 | #include "avformat.h" |
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| 24 | #include "rtpenc.h" |
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| 25 | |||
| 26 | /** |
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| 27 | * Packetize AMR frames into RTP packets according to RFC 3267, |
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| 28 | * in octet-aligned mode. |
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| 29 | */ |
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| 30 | void ff_rtp_send_amr(AVFormatContext *s1, const uint8_t *buff, int size) |
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| 31 | { |
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| 32 | RTPMuxContext *s = s1->priv_data; |
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| 33 | int max_header_toc_size = 1 + s->max_frames_per_packet; |
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| 34 | uint8_t *p; |
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| 35 | int len; |
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| 36 | |||
| 37 | /* Test if the packet must be sent. */ |
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| 38 | len = s->buf_ptr - s->buf; |
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| 39 | if (s->num_frames == s->max_frames_per_packet || (len && len + size - 1 > s->max_payload_size)) { |
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| 40 | int header_size = s->num_frames + 1; |
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| 41 | p = s->buf + max_header_toc_size - header_size; |
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| 42 | if (p != s->buf) |
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| 43 | memmove(p, s->buf, header_size); |
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| 44 | |||
| 45 | ff_rtp_send_data(s1, p, s->buf_ptr - p, 1); |
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| 46 | |||
| 47 | s->num_frames = 0; |
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| 48 | } |
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| 49 | |||
| 50 | if (!s->num_frames) { |
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| 51 | s->buf[0] = 0xf0; |
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| 52 | s->buf_ptr = s->buf + max_header_toc_size; |
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| 53 | s->timestamp = s->cur_timestamp; |
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| 54 | } else { |
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| 55 | /* Mark the previous TOC entry as having more entries following. */ |
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| 56 | s->buf[1 + s->num_frames - 1] |= 0x80; |
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| 57 | } |
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| 58 | |||
| 59 | /* Copy the frame type and quality bits. */ |
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| 60 | s->buf[1 + s->num_frames++] = buff[0] & 0x7C; |
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| 61 | buff++; |
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| 62 | size--; |
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| 63 | memcpy(s->buf_ptr, buff, size); |
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| 64 | s->buf_ptr += size; |
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| 65 | } |