JP2011108330A - Optical disk reproducing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk reproducing apparatus that warns a user about the occurrence of abnormal conditions of reproduction when a bit rate of video data recorded in an optical disk is higher than a maximum transfer rate of an optical disk reading apparatus. <P>SOLUTION: The optical disk reproducing apparatus that has the optical disk reading apparatus which reads the video data recorded in the optical disk and that reproduces video based on the read video data, has a calculation unit that calculates the bit rate of the video data recorded in the optical disk, and a report control unit that lets a reporting unit report an error when the bit rate calculated by the calculation unit is higher the maximum transfer rate of the optical disk reading apparatus. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an optical disc playback apparatus.

  Conventionally, various optical disk playback apparatuses such as a Blu-ray Disc player have been developed, and various inventions regarding error display in the case of abnormal playback have been proposed.

  For example, in Patent Document 1, if content cannot be played back and cannot be played back, playback enable / disable information is set to be disabled, and the cause of playback failure is recorded in the playback disabled factor information. A content playback apparatus that performs possible display and non-playable factor display is disclosed. A bit rate error is cited as a non-reproducible factor, and the bit rate error is an error when exceeding the reproducible bit rate range determined by the codec setting.

Japanese Patent Laying-Open No. 2005-216451 (page 3 to page 7) JP 2006-351152 A (page 8)

  Here, the content to be played back is recorded on the optical disc by the variable bit rate method, and the range of the bit rate of the content is within the range of the reproducible bit rate determined by the codec setting. And the bit rate exceeds the maximum transfer speed of an optical disk reader (for example, a CD drive), an anomaly may occur in the reproduction, but the reproduction itself is possible. In such a case, the non-reproducible display and the non-reproducible factor display are not performed.

  Further, Patent Document 2 discloses an optical disk playback device that displays a message “bit rate error” on a display device when playback cannot be performed due to an unsupported bit rate. Again, no error is displayed.

  In view of the above-described problems, the present invention provides an optical disc playback apparatus that can warn a user about the occurrence of a playback abnormality when the bit rate of video data recorded on an optical disc is higher than the maximum transfer speed of the optical disc reader. The purpose is to provide.

In order to achieve the above object, an optical disc playback apparatus of the present invention includes an optical disc reader for reading video data recorded on an optical disc, and plays back video based on the read video data.
A calculation unit for calculating a bit rate of video data recorded on the optical disc;
When the bit rate calculated by the calculation unit is higher than the maximum transfer rate of the optical disc reader, the notification control unit is configured to notify the error to the notification unit.

  According to such a configuration, when the bit rate of the video data recorded on the optical disc is higher than the maximum transfer rate of the optical disc reader, it is possible to warn the user about the occurrence of a reproduction abnormality.

  In the above configuration, the calculation unit may calculate an average bit rate obtained by dividing a total size of video data recorded on the optical disc by a total playback time before starting playback of the video.

  According to such a configuration, it is possible to warn the user before starting the video playback that a playback abnormality may occur due to the high average bit rate of the video data recorded on the optical disc.

  In any one of the above configurations, the calculation unit may calculate a bit rate per unit time of video data recorded on the optical disc during video playback.

  According to such a configuration, it is possible to warn the user during the reproduction of the video about the occurrence of the reproduction abnormality due to the high bit rate per unit time of the video data recorded on the optical disc.

Further, in this configuration, when the bit rate calculated by the calculation unit is higher than the maximum transfer speed of the optical disc reader, a determination unit that determines whether or not the reproduction of the video is proceeding normally,
The notification control unit may be configured to change an error to be notified to the notification unit according to a determination result by the determination unit.

  According to such a configuration, it is possible to warn the user that the reproduction of video is proceeding normally but there is a possibility that a reproduction abnormality may occur or that a reproduction abnormality has occurred.

  According to the optical disk reproducing apparatus of the present invention, when the bit rate of the video data recorded on the optical disk is higher than the maximum transfer speed of the optical disk reading apparatus, it is possible to warn the user about the occurrence of reproduction abnormality.

1 is a block diagram showing a configuration of a BD (Blu-ray Disc) player according to the present invention. FIG. It is a flowchart regarding the error display process before the reproduction start which concerns on this invention. It is a figure which shows an example of a 1st error display. It is a flowchart regarding an error display process during reproduction according to the present invention. It is a figure which shows an example of a 2nd error display. It is a figure which shows an example of a 3rd error display.

  Embodiments of the present invention will be described below with reference to the drawings.

  Here, a description will be given using a BD (Blu-ray Disc) player as an example of an optical disk reproducing apparatus. FIG. 1 is a block diagram showing the configuration of the BD player 1. The BD player 1 includes an optical disc reader 2, an AV decoder unit 8, an audio output unit 9, a video output unit 10, an OSD (On Screen Display) unit 11, and a system microcomputer 12. A speaker 13 is connected to the audio output unit 9, and a display unit 14 is connected to the video output unit 10.

  The optical disk reader 2 supports reading of an AVI (Audio Video Interleave) file recorded on a BD, DVD (Digital Versatile Disc) and CD (Compact Disc), and includes a spindle motor 3, an optical pickup 4, an RF An amplifier 5, a signal processing unit 6, and a servo circuit 7 are provided.

  The optical pickup 4 includes a light source, an objective lens, an objective lens actuator that drives the objective lens, a light receiving unit, and the like (all not shown), and laser light of each predetermined wavelength corresponding to BD, DVD, and CD is recorded on the disc. The recording surface is irradiated, and the reflected light is received and converted into an electric signal (reflected light detection signal). The optical pickup 4 supplies the reflected light detection signal to the RF amplifier 5. The optical pickup 4 is supported by a predetermined guide shaft or the like so as to be movable in the radial direction of the disc so that target data can be appropriately read from the disc.

  The RF amplifier 5 generates an RF signal, a tracking signal, a focus signal, and the like from the reflected light detection signal supplied from the optical pickup 4. Further, a binarized signal is generated based on the RF signal. The RF amplifier 5 supplies the generated tracking signal or the like to the servo circuit 7 and supplies the generated binarized signal to the signal processing unit 6 as a reproduction signal.

  The spindle motor 3 is a motor for rotating a predetermined turntable on which a disk is mounted. The spindle motor 3 is controlled by a servo circuit 7 and drives the disk to rotate at a constant linear velocity, for example.

  The servo circuit 7 drives and controls the spindle motor 3 to rotate at a predetermined rotational speed. The servo circuit 7 drives and controls an objective lens actuator included in the optical pickup 4 and a sled motor (not shown) that moves the optical pickup 4 in the radial direction of the disk, based on a tracking signal supplied from the RF amplifier 5. .

  The signal processing unit 6 demodulates the reproduction signal supplied from the RF amplifier 5 and performs error correction. The signal processing unit 6 supplies the AVI stream obtained by this demodulation or the like to the AV decoder unit 8.

  The AV decoder unit 8 separates video data and audio data from the supplied AVI stream, decodes the video data and audio data in a predetermined codec format, and generates a video signal and an audio signal. The generated video signal is supplied to the video output unit 10, and the generated audio signal is supplied to the audio output unit 9. The codec format of video data is, for example, DivX, and the codec format of audio data is, for example, MP3.

  The audio output unit 9 converts the supplied audio signal into an analog signal and outputs the analog signal to the speaker 13, and audio is generated from the speaker 13.

  The video output unit 10 converts the supplied video signal into a video signal suitable for display on the display unit 14 and outputs the video signal to the display unit 14. The display unit 14 displays video based on the input video signal.

  The OSD unit 11 generates an OSD image according to an instruction from the system microcomputer 12, outputs the OSD image to the video output unit 10, and causes the display unit 14 to display the OSD image.

  The system microcomputer 12 is composed of, for example, a one-chip microcomputer including a ROM, a RAM, and a CPU, and controls the entire BD player 1.

  Next, error display processing before the start of video / audio reproduction in the BD player 1 having the above configuration will be described with reference to the flowchart of FIG.

  When the user inserts a disc into the optical disc reader 2, the flowchart of FIG. 2 is started. First, in step S20, the system microcomputer 12 determines the disc type (BD, DVD, CD).

  Here, for example, laser light is emitted from the light source of the optical pickup 4 and the objective lens is driven in the direction of approaching the disk in the focus direction (direction perpendicular to the disk surface). The microcomputer 12 acquires the ratio between the amplitude of the focus error signal and the maximum value of the total light amount signal, and the system microcomputer 12 calculates the ratio of the calculated ratios for each light source corresponding to each disk type. To discriminate the disk type.

  In step S21, the optical disc reader 2 starts reading the AVI file recorded on the disc.

  Next, in step S22, the system microcomputer 12 calculates an average bit rate.

  Here, the AV decoder unit 8 obtains total video frame number information, frame rate information, and size information per video frame for all video frames from the AVI stream supplied from the signal processing unit 6, and the system microcomputer 12 Notify Then, the system microcomputer 12 calculates the total playback time from the total video frame number information and the frame rate information, calculates the total size information per video frame, that is, the total size of all video frames, and calculates the total size as the total playback. The average bit rate is calculated by dividing by time.

  In step S23, the system microcomputer 12 determines whether or not the average bit rate calculated in step S22 is higher than the maximum transfer rate of the optical disc reader 2 corresponding to the disc type determined in step S20. The maximum transfer speed of the optical disc reader 2 is, for example, 36 Mbps for BD, 21.6 Mbps for DVD, and 4.8 Mbps for CD.

  If the average bit rate is higher than the maximum transfer rate of the optical disc reader 2 (Y in step S23), the process proceeds to step S24, and the OSD unit 11 generates an OSD image according to an instruction from the system microcomputer 12, and is displayed on the display unit 14. A first error is displayed. An example of the first error display is shown in FIG. If the average bit rate is higher than the maximum transfer speed of the optical disc reader 2, an abnormality may occur that the image is not in time during image reproduction. Therefore, the first error display causes an abnormality in the image reproduction. The user can be warned that it may occur.

  After the first error display, the AV decoder unit 8 starts decoding video data and audio data, and video playback on the display unit 14 and audio playback on the speaker 13 are started.

  If the average bit rate is equal to or lower than the maximum transfer speed of the optical disc reader 2 in step S23 (N in step S23), video / audio reproduction is started without performing the first error display.

  Next, error display processing during video / audio reproduction in the BD player 1 will be described with reference to the flowchart of FIG.

  First, when the AV decoder unit 8 starts decoding video data and audio data and video / audio reproduction is started, the AV decoder unit 8 acquires the size information of one video frame to be decoded from the AVI stream, and Notification of the acquired size information to the system microcomputer 12 is started.

  In step S40, the system microcomputer 12 calculates the sum of the size information notified from the AV decoder unit 8 for one second of video frames, that is, the bit rate per second, and the calculated bit rate is read from the optical disc. It is determined whether or not the transfer rate is higher than the maximum transfer rate of the device 2. Here, the maximum transfer rate of the optical disc reader 2 uses the maximum transfer rate corresponding to the disc type determined in step S20 of FIG.

  If the bit rate is higher than the maximum transfer rate of the optical disc reader 2 (Y in step S40), the process proceeds to step S41.

  Here, the AV decoder unit 8 notifies the system microcomputer 12 each time the decoded video frame is output to the video output unit 10. In step S41, if the system microcomputer 12 receives the next notification within a predetermined time after receiving the notification from the AV decoder unit 8, the system microcomputer 12 determines that the video reproduction is proceeding normally (Y in step S41). Proceed to S42.

  In step S42, the OSD unit 11 generates an OSD image according to an instruction from the system microcomputer 12, and a second error display is displayed on the display unit 14. An example of the second error display is shown in FIG. If the bit rate is higher than the maximum transfer speed of the optical disc reader 2, there is a possibility that an abnormality may occur in which the video is not in time during video playback. Therefore, the current video playback is normal due to such second error display. However, it is possible to warn the user that there is a possibility that an abnormality will occur in video reproduction in the future.

  In step S41, if the system microcomputer 12 does not receive the next notification within a predetermined time after receiving the notification from the AV decoder unit 8, the system microcomputer 12 determines that the video reproduction is not proceeding normally (N in step S41). ), The process proceeds to step S43.

  In step S43, the OSD unit 11 generates an OSD image according to an instruction from the system microcomputer 12, and a third error is displayed on the display unit 14. An example of the third error display is shown in FIG. Such a third error display can warn the user that an abnormality has occurred in video reproduction due to a high bit rate.

  After the steps S42 and S43, if the user does not perform the reproduction end operation (N in step S44), the process returns to the step S40 to calculate the bit rate for the next one second and perform the same processing as described above.

  If the bit rate is equal to or lower than the maximum transfer speed of the optical disc reader 2 in step S40 (N in step S40), the process proceeds to step S44 without displaying an error.

  In step S44, when the user performs a reproduction end operation (Y in step S44), the process ends (end).

  In particular, when the AVI file is recorded on the disc by the variable bit rate method, the bit rate during reproduction is not constant, and no error is displayed at a portion where the bit rate is low, but at a portion where the bit rate is high, step S42 or step S43 is performed. Will cause an error display.

  Although the embodiments of the present invention have been described above, the embodiments can be variously modified within the scope of the gist of the present invention. For example, a warning by error display may be a voice warning.

DESCRIPTION OF SYMBOLS 1 BD player 2 Optical disk reader 3 Spindle motor 4 Optical pick-up 5 RF amplifier 6 Signal processing part 7 Servo circuit 8 AV decoder part 9 Audio | voice output part 10 Video | video output part 11 OSD part 12 System microcomputer 13 Speaker 14 Display part

Claims (4)

In an optical disc reproducing apparatus comprising an optical disc reading device for reading video data recorded on an optical disc and reproducing video based on the read video data,
A calculation unit for calculating a bit rate of video data recorded on the optical disc;
An optical disc reproducing apparatus, comprising: a notification control section that causes the notification section to notify an error when the bit rate calculated by the calculation section is higher than a maximum transfer rate of the optical disk reading apparatus.   2. The optical disc reproducing apparatus according to claim 1, wherein the calculating unit calculates an average bit rate obtained by dividing a total size of video data recorded on the optical disc by a total reproduction time before starting reproduction of the video. .   The optical disk reproducing apparatus according to claim 1, wherein the calculating unit calculates a bit rate per unit time of video data recorded on the optical disk during video reproduction. When the bit rate calculated by the calculation unit is higher than the maximum transfer speed of the optical disc reader, the determination unit includes a determination unit that determines whether or not the video reproduction is proceeding normally,
The optical disc reproducing apparatus according to claim 3, wherein the notification control unit changes an error to be notified to the notification unit according to a determination result by the determination unit.

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