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ffmpeg / libavformat / rtpenc_h264.c @ 9dd94f83

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1 f79bfe48 Luca Abeni
/*
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 * RTP packetization for H.264 (RFC3984)
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 * Copyright (c) 2008 Luca Abeni
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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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/**
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 * @file
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 * @brief H.264 packetization
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 * @author Luca Abeni <lucabe72@email.it>
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 */
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#include "avformat.h"
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#include "avc.h"
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#include "rtpenc.h"
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static void nal_send(AVFormatContext *s1, const uint8_t *buf, int size, int last)
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{
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    RTPMuxContext *s = s1->priv_data;
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    av_log(s1, AV_LOG_DEBUG, "Sending NAL %x of len %d M=%d\n", buf[0] & 0x1F, size, last);
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    if (size <= s->max_payload_size) {
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        ff_rtp_send_data(s1, buf, size, last);
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    } else {
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        uint8_t type = buf[0] & 0x1F;
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        uint8_t nri = buf[0] & 0x60;
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        av_log(s1, AV_LOG_DEBUG, "NAL size %d > %d\n", size, s->max_payload_size);
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        s->buf[0] = 28;        /* FU Indicator; Type = 28 ---> FU-A */
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        s->buf[0] |= nri;
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        s->buf[1] = type;
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        s->buf[1] |= 1 << 7;
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        buf += 1;
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        size -= 1;
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        while (size + 2 > s->max_payload_size) {
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            memcpy(&s->buf[2], buf, s->max_payload_size - 2);
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            ff_rtp_send_data(s1, s->buf, s->max_payload_size, 0);
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            buf += s->max_payload_size - 2;
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            size -= s->max_payload_size - 2;
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            s->buf[1] &= ~(1 << 7);
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        }
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        s->buf[1] |= 1 << 6;
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        memcpy(&s->buf[2], buf, size);
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        ff_rtp_send_data(s1, s->buf, size + 2, last);
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    }
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}
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void ff_rtp_send_h264(AVFormatContext *s1, const uint8_t *buf1, int size)
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{
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    const uint8_t *r;
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    RTPMuxContext *s = s1->priv_data;
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    s->timestamp = s->cur_timestamp;
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    r = ff_avc_find_startcode(buf1, buf1 + size);
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    while (r < buf1 + size) {
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        const uint8_t *r1;
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        while(!*(r++));
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        r1 = ff_avc_find_startcode(r, buf1 + size);
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        nal_send(s1, r, r1 - r, (r1 == buf1 + size));
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        r = r1;
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    }
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}