LINUX DVB API Version 3 - Linux TV.org

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14 DVB FRONTEND API 2.2.7 FE READ UNCORRECTED BLOCKS DESCRIPTION This ioctl call returns the number of uncorrected blocks detected by the device driver during its lifetime. For meaningful measurements, the increment in block count during a specific time interval should be calculated. For this command, read-only access to the device is sufficient. Note that the counter will wrap to zero after its maximum count has been reached. SYNOPSIS int ioctl( int fd, int request = FE READ UNCORRECTED BLOCKS, uint32 t *ublocks); PARAMETERS int fd File descriptor returned by a previous call to open(). int request Equals FE READ UNCORRECTED BLOCKS for this command. uint32 t *ublocks The total number of uncorrected blocks seen by the driver so far. ERRORS EBADF fd is not a valid open file descriptor. EFAULT ublocks points to invalid address. ENOSYS Function not available for this device. 2.2.8 FE SET FRONTEND DESCRIPTION This ioctl call starts a tuning operation using specified parameters. The result of this call will be successful if the parameters were valid and the tuning could be initiated. The result of the tuning operation in itself, however, will arrive asynchronously as an event (see documentation for FE GET EVENT and FrontendEvent.) If a new FE SET FRONTEND operation is initiated before the previous one was completed, the previous operation will be aborted in favor of the new one. This command requires read/write access to the device. SYNOPSIS int ioctl(int fd, int request = FE SET FRONTEND, struct dvb frontend parameters *p); PARAMETERS int fd File descriptor returned by a previous call to open(). int request Equals FE SET FRONTEND for this command. struct dvb frontend parameters *p Points to parameters for tuning operation. ERRORS EBADF fd is not a valid open file descriptor. EFAULT p points to invalid address. EINVAL Maximum supported symbol rate reached. 14
2.2. Frontend Function Calls 15 2.2.9 FE GET FRONTEND DESCRIPTION This ioctl call queries the currently effective frontend parameters. For this command, read-only access to the device is sufficient. SYNOPSIS int ioctl(int fd, int request = FE GET FRONTEND, struct dvb frontend parameters *p); PARAMETERS int fd File descriptor returned by a previous call to open(). int request Equals FE SET FRONTEND for this command. struct dvb frontend parameters *p ERRORS Points to parameters for tuning operation. EBADF fd is not a valid open file descriptor. EFAULT p points to invalid address. EINVAL Maximum supported symbol rate reached. 2.2.10 FE GET EVENT DESCRIPTION This ioctl call returns a frontend event if available. If an event is not available, the behavior depends on whether the device is in blocking or non-blocking mode. In the latter case, the call fails immediately with errno set to EWOULD- BLOCK. In the former case, the call blocks until an event becomes available. The standard Linux poll() and/or select() system calls can be used with the device file descriptor to watch for new events. For select(), the file descriptor should be included in the exceptfds argument, and for poll(), POLLPRI should be specified as the wake-up condition. Since the event queue allocated is rather small (room for 8 events), the queue must be serviced regularly to avoid overflow. If an overflow happens, the oldest event is discarded from the queue, and an error (EOVERFLOW) occurs the next time the queue is read. After reporting the error condition in this fashion, subsequent FE GET EVENT calls will return events from the queue as usual. For the sake of implementation simplicity, this command requires read/write access to the device. SYNOPSIS int ioctl(int fd, int request = QPSK GET EVENT, struct dvb frontend event *ev); PARAMETERS int fd File descriptor returned by a previous call to open(). int request Equals FE GET EVENT for this command. struct Points to the location where the event, dvb frontend event *ev if any, is to be stored. 15
Page 1 and 2: LINUX DVB API Version 3 Copyright 2
Page 3 and 4: Contents 1 Introduction 1 1.1 What
Page 5 and 6: CONTENTS CONTENTS 4.2.7 VIDEO CONTI
Page 7 and 8: CONTENTS CONTENTS 8.6 Section Feed
Page 9 and 10: Chapter 1 Introduction 1.1 What you
Page 11 and 12: 1.4. Linux DVB Devices 3 1.4 Linux
Page 13 and 14: Chapter 2 DVB Frontend API The DVB
Page 15 and 16: 2.1. Frontend Data Types 7 2.1.5 di
Page 17 and 18: 2.1. Frontend Data Types 9 }; fe_gu
Page 19 and 20: 2.2. Frontend Function Calls 11 2.2
Page 21: 2.2. Frontend Function Calls 13 2.2
Page 29 and 30: Chapter 3 DVB Demux Device The DVB
Page 31 and 32: 3.1. Demux Data Types 23 }; dmx_pes
Page 33 and 34: 3.2. Demux Function Calls 25 3.2.3
Page 39 and 40: Chapter 4 DVB Video Device The DVB
Page 41 and 42: 4.1. Video Data Types 33 struct vid
Page 43 and 44: 4.1. Video Data Types 35 typedef st
Page 45 and 46: 4.2. Video Function Calls 37 4.2.3
Page 47 and 48: 4.2. Video Function Calls 39 int fd
Page 49 and 50: 4.2. Video Function Calls 41 4.2.12
Page 51 and 52: 4.2. Video Function Calls 43 PARAME
Page 57 and 58: Chapter 5 DVB Audio Device The DVB
Page 59 and 60: 5.1. Audio Data Types 51 5.1.7 stru
Page 61 and 62: 5.2. Audio Function Calls 53 5.2.3
Page 63 and 64: 5.2. Audio Function Calls 55 5.2.8
Page 65 and 66: 5.2. Audio Function Calls 57 int fd
Page 67 and 68: 5.2. Audio Function Calls 59 int io
Page 69 and 70: Chapter 6 DVB CA Device The DVB CA
Page 71 and 72: 6.2. CA Function Calls 63 6.2 CA Fu
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Chapter 7 DVB Network API The DVB n
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Chapter 8 Kernel Demux API The kern
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8.1. Kernel Demux Data Types 69 int
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8.1. Kernel Demux Data Types 71 #de
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8.2. Demux Directory API 73 8.2 Dem
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8.3. Demux API 75 8.3 Demux API The
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8.3. Demux API 77 8.3.4 allocate ts
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8.3. Demux API 79 dmx demux t mux*d
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8.3. Demux API 81 8.3.11 remove fro
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8.4. Demux Callback API 83 8.4 Demu
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8.4. Demux Callback API 85 u8* buff
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8.5. TS Feed API 87 8.5 TS Feed API
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8.6. Section Feed API 89 8.6 Sectio
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8.6. Section Feed API 91 This funct
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Chapter 9 Examples In this section
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9.1. Tuning 95 } } return -1; if (d
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9.2. The DVR device 97 } pesFilterP
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9.2. The DVR device 99 } } return -
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Appendix A GNU Free Documentation L
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A.3. Copying in Quantity 103 You ma
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A.5. Combining Documents 105 You ma
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A.10. Future Revisions of This Lice
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