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This is needed for probing some dvbsub streams in mpegts Fixes part of ticket4221 Signed-off-by: Michael Niedermayer <michaelni@gmx.at>pull/101/head
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/*
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* RAW dvbsub demuxer |
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* Copyright (c) 2015 Michael Niedermayer <michaelni@gmx.at> |
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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 "libavutil/intreadwrite.h" |
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#include "avformat.h" |
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#include "rawdec.h" |
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static int dvbsub_probe(AVProbeData *p) |
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{ |
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int i, j, k; |
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const uint8_t *end = p->buf + p->buf_size; |
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int type, page_id, len; |
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int max_score = 0; |
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for(i=0; i<p->buf_size; i++){ |
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const uint8_t *ptr = p->buf + i; |
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uint8_t histogram[6] = {0}; |
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int min = 255; |
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for(j=0; ptr + 6 < end; j++) { |
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if (*ptr != 0x0f) |
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break; |
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type = ptr[1]; |
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page_id = AV_RB16(ptr + 2); |
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len = AV_RB16(ptr + 4); |
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if (type == 0x80) { |
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; |
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} else if (type >= 0x10 && type <= 0x14) { |
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histogram[type - 0x10] ++; |
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} else |
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break; |
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ptr += 6 + len; |
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} |
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for (k=0; k < 4; k++) { |
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min = FFMIN(min, histogram[k]); |
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} |
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if (min && j > max_score) |
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max_score = j; |
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} |
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if (max_score > 5) |
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return AVPROBE_SCORE_EXTENSION/2; |
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return 0; |
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} |
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FF_DEF_RAWSUB_DEMUXER(dvbsub, "raw dvbsub", dvbsub_probe, NULL, AV_CODEC_ID_DVB_SUBTITLE, AVFMT_GENERIC_INDEX) |
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