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ffmpeg / libavformat / rtpenc_mpv.c @ 2912e87a

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/*
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 * RTP packetization for MPEG video
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 * Copyright (c) 2002 Fabrice Bellard
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 * Copyright (c) 2007 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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#include "libavcodec/mpegvideo.h"
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#include "avformat.h"
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#include "rtpenc.h"
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/* NOTE: a single frame must be passed with sequence header if
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   needed. XXX: use slices. */
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void ff_rtp_send_mpegvideo(AVFormatContext *s1, const uint8_t *buf1, int size)
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{
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    RTPMuxContext *s = s1->priv_data;
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    int len, h, max_packet_size;
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    uint8_t *q;
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    const uint8_t *end = buf1 + size;
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    int begin_of_slice, end_of_slice, frame_type, temporal_reference;
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    max_packet_size = s->max_payload_size;
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    begin_of_slice = 1;
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    end_of_slice = 0;
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    frame_type = 0;
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    temporal_reference = 0;
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    while (size > 0) {
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        int begin_of_sequence;
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        begin_of_sequence = 0;
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        len = max_packet_size - 4;
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        if (len >= size) {
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            len = size;
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            end_of_slice = 1;
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        } else {
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            const uint8_t *r, *r1;
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            int start_code;
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            r1 = buf1;
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            while (1) {
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                start_code = -1;
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                r = ff_find_start_code(r1, end, &start_code);
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                if((start_code & 0xFFFFFF00) == 0x100) {
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                    /* New start code found */
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                    if (start_code == 0x100) {
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                        frame_type = (r[1] & 0x38) >> 3;
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                        temporal_reference = (int)r[0] << 2 | r[1] >> 6;
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                    }
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                    if (start_code == 0x1B8) {
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                        begin_of_sequence = 1;
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                    }
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                    if (r - buf1 - 4 <= len) {
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                        /* The current slice fits in the packet */
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                        if (begin_of_slice == 0) {
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                            /* no slice at the beginning of the packet... */
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                            end_of_slice = 1;
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                            len = r - buf1 - 4;
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                            break;
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                        }
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                        r1 = r;
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                    } else {
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                        if ((r1 - buf1 > 4) && (r - r1 < max_packet_size)) {
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                            len = r1 - buf1 - 4;
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                            end_of_slice = 1;
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                        }
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                        break;
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                    }
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                } else {
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                    break;
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                }
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            }
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        }
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        h = 0;
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        h |= temporal_reference << 16;
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        h |= begin_of_sequence << 13;
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        h |= begin_of_slice << 12;
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        h |= end_of_slice << 11;
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        h |= frame_type << 8;
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        q = s->buf;
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        *q++ = h >> 24;
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        *q++ = h >> 16;
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        *q++ = h >> 8;
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        *q++ = h;
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        memcpy(q, buf1, len);
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        q += len;
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        /* 90kHz time stamp */
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        s->timestamp = s->cur_timestamp;
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        ff_rtp_send_data(s1, s->buf, q - s->buf, (len == size));
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        buf1 += len;
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        size -= len;
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        begin_of_slice = end_of_slice;
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        end_of_slice = 0;
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    }
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}
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