| … | |
… | |
| 15 | =item new |
15 | =item new |
| 16 | |
16 | |
| 17 | Create a new VBI decoder object. VBI decoding often requires state, which |
17 | Create a new VBI decoder object. VBI decoding often requires state, which |
| 18 | this object represents |
18 | this object represents |
| 19 | |
19 | |
| 20 | =item reset |
20 | =item reset (NYI) |
| 21 | |
21 | |
| 22 | Reset the state (e.g. after switching a channel). |
22 | Reset the state (e.g. after switching a channel). |
| 23 | |
23 | |
| 24 | =back |
24 | =back |
| 25 | |
25 | |
| … | |
… | |
| 46 | ); |
46 | ); |
| 47 | bootstrap Video::Capture::VBI $VERSION; |
47 | bootstrap Video::Capture::VBI $VERSION; |
| 48 | } |
48 | } |
| 49 | |
49 | |
| 50 | use Fcntl; |
50 | use Fcntl; |
|
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51 | |
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52 | =head1 CONSTANTS / MASK OPERATORS |
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53 | |
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54 | The following constants are available (see ETS 300 706 for a more thorough |
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55 | definition). |
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56 | |
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57 | VTX_SUB 0x003f7f # S1..S4 field mask |
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58 | |
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59 | VTX_C4 0x000080 # erase page |
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60 | VTX_C5 0x004000 # newsflash |
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61 | VTX_C6 0x008000 # subtitle |
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62 | VTX_C7 0x010000 # suppress header |
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63 | VTX_C8 0x020000 # update indicator |
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64 | VTX_C9 0x040000 # interrupted sequence |
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65 | VTX_C10 0x080000 # inhibit display |
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66 | VTX_C11 0x100000 # magazine serial |
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67 | |
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68 | VTX_C12 0x200000 # ... option ... |
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69 | VTX_C13 0x400000 # ... character ... |
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70 | VTX_C14 0x800000 # ... set |
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71 | |
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72 | The following mask functions all take a single "CTRL" bitfield and return |
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73 | the corresponding subfield: |
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74 | |
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75 | VTX_S1 (shift )&15 } # S1 |
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76 | VTX_S2 (shift>> 4)& 7 } # S2 |
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77 | VTX_S3 (shift>> 8)&15 } # S3 |
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78 | VTX_S4 (shift>>12)& 3 } # S4 |
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79 | VTX_NOC (shift>>21)& 7 } # national character set... |
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80 | |
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|
81 | =cut |
| 51 | |
82 | |
| 52 | sub VTX_SUB (){ 0x003f7f } |
83 | sub VTX_SUB (){ 0x003f7f } |
| 53 | sub VTX_S1 ($){ (shift )&15 } |
84 | sub VTX_S1 ($){ (shift )&15 } |
| 54 | sub VTX_S2 ($){ (shift>> 4)& 7 } |
85 | sub VTX_S2 ($){ (shift>> 4)& 7 } |
| 55 | sub VTX_S3 ($){ (shift>> 8)&15 } |
86 | sub VTX_S3 ($){ (shift>> 8)&15 } |
