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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * RAW DTS demuxer |
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| 3 | * Copyright (c) 2008 Benjamin Larsson |
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| 4 | * |
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| 5 | * This file is part of FFmpeg. |
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| 6 | * |
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| 7 | * FFmpeg is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Lesser General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2.1 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * FFmpeg is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Lesser General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Lesser General Public |
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| 18 | * License along with FFmpeg; if not, write to the Free Software |
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| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | */ |
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| 21 | |||
| 22 | #include "libavcodec/bytestream.h" |
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| 23 | #include "avformat.h" |
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| 24 | #include "rawdec.h" |
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| 25 | |||
| 26 | #define DCA_MARKER_14B_BE 0x1FFFE800 |
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| 27 | #define DCA_MARKER_14B_LE 0xFF1F00E8 |
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| 28 | #define DCA_MARKER_RAW_BE 0x7FFE8001 |
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| 29 | #define DCA_MARKER_RAW_LE 0xFE7F0180 |
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| 30 | |||
| 31 | static int dts_probe(AVProbeData *p) |
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| 32 | { |
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| 33 | const uint8_t *buf, *bufp; |
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| 34 | uint32_t state = -1; |
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| 35 | int markers[3] = {0}; |
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| 36 | int sum, max; |
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| 37 | int64_t diff = 0; |
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| 38 | |||
| 39 | buf = p->buf; |
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| 40 | |||
| 41 | for(; buf < (p->buf+p->buf_size)-2; buf+=2) { |
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| 42 | bufp = buf; |
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| 43 | state = (state << 16) | bytestream_get_be16(&bufp); |
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| 44 | |||
| 45 | /* regular bitstream */ |
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| 46 | if (state == DCA_MARKER_RAW_BE || state == DCA_MARKER_RAW_LE) |
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| 47 | markers[0]++; |
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| 48 | |||
| 49 | /* 14 bits big-endian bitstream */ |
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| 50 | if (state == DCA_MARKER_14B_BE) |
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| 51 | if ((bytestream_get_be16(&bufp) & 0xFFF0) == 0x07F0) |
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| 52 | markers[1]++; |
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| 53 | |||
| 54 | /* 14 bits little-endian bitstream */ |
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| 55 | if (state == DCA_MARKER_14B_LE) |
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| 56 | if ((bytestream_get_be16(&bufp) & 0xF0FF) == 0xF007) |
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| 57 | markers[2]++; |
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| 58 | |||
| 59 | if (buf - p->buf >= 4) |
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| 60 | diff += FFABS(AV_RL16(buf) - AV_RL16(buf-4)); |
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| 61 | } |
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| 62 | sum = markers[0] + markers[1] + markers[2]; |
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| 63 | max = markers[1] > markers[0]; |
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| 64 | max = markers[2] > markers[max] ? 2 : max; |
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| 65 | if (markers[max] > 3 && p->buf_size / markers[max] < 32*1024 && |
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| 66 | markers[max] * 4 > sum * 3 && |
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| 67 | diff / p->buf_size > 200) |
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| 68 | return AVPROBE_SCORE_EXTENSION + 1; |
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| 69 | |||
| 70 | return 0; |
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| 71 | } |
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| 72 | |||
| 73 | AVInputFormat ff_dts_demuxer = { |
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| 74 | .name = "dts", |
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| 75 | .long_name = NULL_IF_CONFIG_SMALL("raw DTS"), |
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| 76 | .read_probe = dts_probe, |
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| 77 | .read_header = ff_raw_audio_read_header, |
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| 78 | .read_packet = ff_raw_read_partial_packet, |
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| 79 | .flags = AVFMT_GENERIC_INDEX, |
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| 80 | .extensions = "dts", |
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| 81 | .raw_codec_id = AV_CODEC_ID_DTS, |
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| 82 | }; |