PeerStreamer

/*

 * RAW MPEG-4 video demuxer

 * Copyright (c) 2006  Thijs Vermeir <thijs.vermeir@barco.com>

 *

 * This file is part of FFmpeg.

 *

 * FFmpeg 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.

 *

 * FFmpeg 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 FFmpeg; if not, write to the Free Software

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

 */

#include "avformat.h"

#include "rawdec.h"

#define VISUAL_OBJECT_START_CODE       0x000001b5

#define VOP_START_CODE                 0x000001b6

static int mpeg4video_probe(AVProbeData *probe_packet)

{

    uint32_t temp_buffer= -1;

    int VO=0, VOL=0, VOP = 0, VISO = 0, res=0;

    int i;

    for(i=0; i<probe_packet->buf_size; i++){

        temp_buffer = (temp_buffer<<8) + probe_packet->buf[i];

        if ((temp_buffer & 0xffffff00) != 0x100)

            continue;

        if (temp_buffer == VOP_START_CODE)                         VOP++;

        else if (temp_buffer == VISUAL_OBJECT_START_CODE)          VISO++;

        else if (temp_buffer < 0x120)                              VO++;

        else if (temp_buffer < 0x130)                              VOL++;

        else if (   !(0x1AF < temp_buffer && temp_buffer < 0x1B7)

                 && !(0x1B9 < temp_buffer && temp_buffer < 0x1C4)) res++;

    }

    if (VOP >= VISO && VOP >= VOL && VO >= VOL && VOL > 0 && res==0)

        return VOP+VO > 3 ? AVPROBE_SCORE_MAX/2 : AVPROBE_SCORE_MAX/4;

    return 0;

}

AVInputFormat ff_m4v_demuxer = {

    "m4v",

    NULL_IF_CONFIG_SMALL("raw MPEG-4 video format"),

    0,

    mpeg4video_probe, /** probing for MPEG-4 data */

    ff_raw_video_read_header,

    ff_raw_read_partial_packet,

    .flags= AVFMT_GENERIC_INDEX,

    .extensions = "m4v",

    .value = CODEC_ID_MPEG4,

};