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69 lines
2.4 KiB
69 lines
2.4 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 "libavcodec/startcode.h" |
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#include "avformat.h" |
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#include "rawdec.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(const 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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const uint8_t *ptr = p->buf, *end = p->buf + p->buf_size; |
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while (ptr < end) { |
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ptr = avpriv_find_start_code(ptr, end, &code); |
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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 (*ptr != 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_EXTENSION+1; |
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return 0; |
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} |
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FF_DEF_RAWVIDEO_DEMUXER(cavsvideo, "raw Chinese AVS (Audio Video Standard)", cavsvideo_probe, NULL, AV_CODEC_ID_CAVS)
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