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77 lines
2.4 KiB
77 lines
2.4 KiB
/* |
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* RAW DTS demuxer |
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* Copyright (c) 2008 Benjamin Larsson |
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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/bytestream.h" |
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#include "avformat.h" |
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#include "rawdec.h" |
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#define DCA_MARKER_14B_BE 0x1FFFE800 |
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#define DCA_MARKER_14B_LE 0xFF1F00E8 |
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#define DCA_MARKER_RAW_BE 0x7FFE8001 |
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#define DCA_MARKER_RAW_LE 0xFE7F0180 |
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static int dts_probe(AVProbeData *p) |
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{ |
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const uint8_t *buf, *bufp; |
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uint32_t state = -1; |
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int markers[3] = {0}; |
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int sum, max; |
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buf = p->buf; |
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for(; buf < (p->buf+p->buf_size)-2; buf+=2) { |
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bufp = buf; |
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state = (state << 16) | bytestream_get_be16(&bufp); |
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/* regular bitstream */ |
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if (state == DCA_MARKER_RAW_BE || state == DCA_MARKER_RAW_LE) |
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markers[0]++; |
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/* 14 bits big-endian bitstream */ |
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if (state == DCA_MARKER_14B_BE) |
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if ((bytestream_get_be16(&bufp) & 0xFFF0) == 0x07F0) |
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markers[1]++; |
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/* 14 bits little-endian bitstream */ |
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if (state == DCA_MARKER_14B_LE) |
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if ((bytestream_get_be16(&bufp) & 0xF0FF) == 0xF007) |
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markers[2]++; |
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} |
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sum = markers[0] + markers[1] + markers[2]; |
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max = markers[1] > markers[0]; |
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max = markers[2] > markers[max] ? 2 : max; |
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if (markers[max] > 3 && p->buf_size / markers[max] < 32*1024 && |
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markers[max] * 4 > sum * 3) |
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return AVPROBE_SCORE_MAX/2+1; |
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return 0; |
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} |
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AVInputFormat ff_dts_demuxer = { |
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.name = "dts", |
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.long_name = NULL_IF_CONFIG_SMALL("raw DTS"), |
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.read_probe = dts_probe, |
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.read_header = ff_raw_audio_read_header, |
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.read_packet = ff_raw_read_partial_packet, |
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.flags= AVFMT_GENERIC_INDEX, |
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.extensions = "dts", |
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.raw_codec_id = CODEC_ID_DTS, |
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};
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