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ffmpeg / libavformat / rtpenc_aac.c @ 22c1f65f

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/*
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 * copyright (c) 2007 Luca Abeni
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg 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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 * FFmpeg 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 FFmpeg; 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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void ff_rtp_send_aac(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 len, max_packet_size;
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    uint8_t *p;
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    const int max_frames_per_packet = s->max_frames_per_packet ? s->max_frames_per_packet : 5;
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    const int max_au_headers_size = 2 + 2 * max_frames_per_packet;
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    /* skip ADTS header, if present */
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    if ((s1->streams[0]->codec->extradata_size) == 0) {
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        size -= 7;
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        buff += 7;
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    }
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    max_packet_size = s->max_payload_size - max_au_headers_size;
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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 == max_frames_per_packet) || (len && (len + size) > s->max_payload_size)) {
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        int au_size = s->num_frames * 2;
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        p = s->buf + max_au_headers_size - au_size - 2;
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        if (p != s->buf) {
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            memmove(p + 2, s->buf + 2, au_size);
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        }
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        /* Write the AU header size */
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        p[0] = ((au_size * 8) & 0xFF) >> 8;
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        p[1] = (au_size * 8) & 0xFF;
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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 == 0) {
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        s->buf_ptr = s->buf + max_au_headers_size;
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        s->timestamp = s->cur_timestamp;
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    }
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    if (size <= max_packet_size) {
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        p = s->buf + s->num_frames++ * 2 + 2;
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        *p++ = size >> 5;
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        *p = (size & 0x1F) << 3;
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        memcpy(s->buf_ptr, buff, size);
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        s->buf_ptr += size;
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    } else {
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        int au_size = size;
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        max_packet_size = s->max_payload_size - 4;
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        p = s->buf;
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        p[0] = 0;
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        p[1] = 16;
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        while (size > 0) {
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            len = FFMIN(size, max_packet_size);
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            p[2] = au_size >> 5;
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            p[3] = (au_size & 0x1F) << 3;
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            memcpy(p + 4, buff, len);
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            ff_rtp_send_data(s1, p, len + 4, len == size);
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            size -= len;
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            buff += len;
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        }
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    }
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}