66 lines
2.1 KiB
C
66 lines
2.1 KiB
C
/*
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* RTP packetization for AMR audio
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* Copyright (c) 2007 Luca Abeni
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* Copyright (c) 2009 Martin Storsjo
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avformat.h"
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#include "rtpenc.h"
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/**
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* Packetize AMR frames into RTP packets according to RFC 3267,
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* in octet-aligned mode.
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*/
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void ff_rtp_send_amr(AVFormatContext *s1, const uint8_t *buff, int size)
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{
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RTPMuxContext *s = s1->priv_data;
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int max_header_toc_size = 1 + s->max_frames_per_packet;
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uint8_t *p;
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int len;
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/* Test if the packet must be sent. */
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len = s->buf_ptr - s->buf;
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if (s->num_frames == s->max_frames_per_packet || (len && len + size - 1 > s->max_payload_size)) {
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int header_size = s->num_frames + 1;
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p = s->buf + max_header_toc_size - header_size;
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if (p != s->buf)
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memmove(p, s->buf, header_size);
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ff_rtp_send_data(s1, p, s->buf_ptr - p, 1);
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s->num_frames = 0;
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}
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if (!s->num_frames) {
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s->buf[0] = 0xf0;
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s->buf_ptr = s->buf + max_header_toc_size;
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s->timestamp = s->cur_timestamp;
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} else {
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/* Mark the previous TOC entry as having more entries following. */
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s->buf[1 + s->num_frames - 1] |= 0x80;
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}
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/* Copy the frame type and quality bits. */
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s->buf[1 + s->num_frames++] = buff[0] & 0x7C;
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buff++;
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size--;
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memcpy(s->buf_ptr, buff, size);
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s->buf_ptr += size;
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}
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