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77 lines
2.5 KiB
77 lines
2.5 KiB
/* |
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* RAW Chinese AVS video demuxer |
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* Copyright (c) 2009 Stefan Gehrer <stefan.gehrer@gmx.de> |
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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 "avformat.h" |
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#include "raw.h" |
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#define CAVS_SEQ_START_CODE 0x000001b0 |
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#define CAVS_PIC_I_START_CODE 0x000001b3 |
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#define CAVS_UNDEF_START_CODE 0x000001b4 |
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#define CAVS_PIC_PB_START_CODE 0x000001b6 |
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#define CAVS_VIDEO_EDIT_CODE 0x000001b7 |
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#define CAVS_PROFILE_JIZHUN 0x20 |
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static int cavsvideo_probe(AVProbeData *p) |
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{ |
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uint32_t code= -1; |
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int pic=0, seq=0, slice_pos = 0; |
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int i; |
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for(i=0; i<p->buf_size; i++){ |
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code = (code<<8) + p->buf[i]; |
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if ((code & 0xffffff00) == 0x100) { |
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if(code < CAVS_SEQ_START_CODE) { |
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/* slices have to be consecutive */ |
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if(code < slice_pos) |
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return 0; |
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slice_pos = code; |
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} else { |
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slice_pos = 0; |
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} |
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if (code == CAVS_SEQ_START_CODE) { |
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seq++; |
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/* check for the only currently supported profile */ |
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if(p->buf[i+1] != CAVS_PROFILE_JIZHUN) |
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return 0; |
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} else if ((code == CAVS_PIC_I_START_CODE) || |
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(code == CAVS_PIC_PB_START_CODE)) { |
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pic++; |
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} else if ((code == CAVS_UNDEF_START_CODE) || |
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(code > CAVS_VIDEO_EDIT_CODE)) { |
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return 0; |
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} |
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} |
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} |
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if(seq && seq*9<=pic*10) |
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return AVPROBE_SCORE_MAX/2; |
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return 0; |
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} |
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AVInputFormat cavsvideo_demuxer = { |
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"cavsvideo", |
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NULL_IF_CONFIG_SMALL("raw Chinese AVS video"), |
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0, |
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cavsvideo_probe, |
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ff_raw_video_read_header, |
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ff_raw_read_partial_packet, |
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.flags= AVFMT_GENERIC_INDEX, |
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.value = CODEC_ID_CAVS, |
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};
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