PeerStreamer

/*

 * RTP packetization for H.264 (RFC3984)

 * Copyright (c) 2008 Luca Abeni

 *

 * This file is part of Libav.

 *

 * Libav is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 of the License, or (at your option) any later version.

 *

 * Libav is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with Libav; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

 */

/**

 * @file

 * @brief H.264 packetization

 * @author Luca Abeni <lucabe72@email.it>

 */

#include "avformat.h"

#include "avc.h"

#include "rtpenc.h"

static void nal_send(AVFormatContext *s1, const uint8_t *buf, int size, int last)

{

    RTPMuxContext *s = s1->priv_data;

    av_log(s1, AV_LOG_DEBUG, "Sending NAL %x of len %d M=%d\n", buf[0] & 0x1F, size, last);

    if (size <= s->max_payload_size) {

        ff_rtp_send_data(s1, buf, size, last);

    } else {

        uint8_t type = buf[0] & 0x1F;

        uint8_t nri = buf[0] & 0x60;

        av_log(s1, AV_LOG_DEBUG, "NAL size %d > %d\n", size, s->max_payload_size);

        s->buf[0] = 28;        /* FU Indicator; Type = 28 ---> FU-A */

        s->buf[0] |= nri;

        s->buf[1] = type;

        s->buf[1] |= 1 << 7;

        buf += 1;

        size -= 1;

        while (size + 2 > s->max_payload_size) {

            memcpy(&s->buf[2], buf, s->max_payload_size - 2);

            ff_rtp_send_data(s1, s->buf, s->max_payload_size, 0);

            buf += s->max_payload_size - 2;

            size -= s->max_payload_size - 2;

            s->buf[1] &= ~(1 << 7);

        }

        s->buf[1] |= 1 << 6;

        memcpy(&s->buf[2], buf, size);

        ff_rtp_send_data(s1, s->buf, size + 2, last);

    }

}

void ff_rtp_send_h264(AVFormatContext *s1, const uint8_t *buf1, int size)

{

    const uint8_t *r;

    RTPMuxContext *s = s1->priv_data;

    s->timestamp = s->cur_timestamp;

    r = ff_avc_find_startcode(buf1, buf1 + size);

    while (r < buf1 + size) {

        const uint8_t *r1;

        while(!*(r++));

        r1 = ff_avc_find_startcode(r, buf1 + size);

        nal_send(s1, r, r1 - r, (r1 == buf1 + size));

        r = r1;

    }

}