Ati Technologies Inc.

Ati Technologies Ulc

Broadcom Corporation

Ati International Srl

Branko D Kovacevic

Kevork Kechichian

A multiplexed packetized data stream carrying real-time multimedia programs is received at a first hardware demultiplexer. Based on a user input, a video and timing portion of a program associated with the multiplexed packetized data stream can be stored for subsequent display. One type of subsequent display is time shifted display, where the stored portion of the program is played back while new portions of the program are being stored. During time shifted play back, a second hardware demultiplexer can be used, so that one demultiplexer stores new data and maintains a current clock value while the other decodes and displays the stored data.

System for digital time shifting and method thereof

In accordance with a specific aspect of the present invention, a compressed video stream, such as an MPEG-2 video stream, is received by a transport demultiplexor, synchronized, parsed into separate packet types, and written to buffer locations external the demultiplexor. Adaptation field is handled by a separate parser. In addition, primary elementary stream data can be handled by separate primary elementary stream parsers based upon the packet identifier of the primary elementary stream. Video packets can be parsed based upon stream identifier values. Specific packets of data are stored in one or more system memory or video memory buffers by an output controller based upon allocation table information. Private data associated with specific elementary streams or packet adaptation fields are repacketized, and written to an output buffer location. In specific implementations, the hardware associated with the system is used to acquire the data stream without any knowledge of the specific protocol of the stream. In another embodiment, the hardware is used to implement a splicing of streams of data.

Method and system for handling data

In accordance with a specific aspect of the present invention, a compressed video stream, such as an MPEG-2 video stream, is received by a transport demultiplexor, synchronized, parsed into separate packet types, and written to buffer locations external the demultiplexor. Adaptation field is handled by a separate parser. In addition, primary elementary stream data can be handled by separate primary elementary stream parsers based upon the packet identifier of the primary elementary stream. Video packets can be parsed based upon stream identifier values. Specific packets of data are stored in one or more system memory or video memory buffers by an output controller based upon allocation table information. Private data associated with specific elementary streams or packet adaptation fields are repacketized, and written to an output buffer location. In specific implementations, the hardware associated with the system is used to acquire the data stream without any knowledge of the specific protocol of the stream. In another embodiment, the hardware is used to implement a splicing of streams of data. A method and system for generating a transport stream for testing such a system is disclosed using a data record specifying a packetized elementary stream payload portion, a transport packet portion, and an adaptation field portion. A text data record is used to generate specific transport stream data to test demultiplexer systems.

Method and system for generating transport stream packets

A system and methods are described for processing digital audio stream data from received transport streams. A transport stream parser identifies particular transport packets related to audio stream data. The transport stream parser enables audio parser and provides packet identifiers of the particular transport packets to the audio parser. The audio parser selects the particular transport packets from a transport stream. The audio parser discards transport packets not related to specific audio types and provides packetized elementary stream audio data to an audio decoding system. The packetized elementary audio stream data is processed into an I2S elementary stream and decoded into pulse-coded modulation (PCM) audio data for output through an external audio receiver, such as through a digital to analog converter. The packetized elementary stream data and I2S elementary stream data are also stored in memory for playback requests generated by the audio decoding system at a later time.

System and method for reception, processing and transmission of digital audio stream

Method and system for receiving and framing packetized data

In accordance with a specific aspect of the present disclosure, a compressed video stream, such as an MPEG-2 video stream, is received by a transport demultiplexor, synchronized, parsed into separate packet types, and written to buffer locations external the demultiplexor. In addition, primary elementary stream data can be handled by separate primary elementary stream parsers based upon the packet identifier of the primary elementary stream. Video packets can be parsed based upon stream identifier values. Specific packets of data are stored in one or more system memory or video memory buffers by an output controller based upon allocation table information. Private data associated with specific elementary streams or packet adaptation fields are repacketized and written to an output buffer location.

Method and system for handling errors

A system and method is provided for synchronizing the presentation of audio data with video data. Audio transport packets are received through a demultiplexer from a multimedia transport stream. A transport stream synchronization manager is used to lock a system time clock, local to the demultiplexer, to a program clock reference provided through the multimedia transport stream. Presentation time stamps are provided with the audio transport packets to indicate when decoded audio data is to be output. A packetized elementary stream synchronization manager maintains synchronization by adding or dropping audio packets from the audio transport packets. If the packetized elementary stream manager is unable to acquire synchronization it must defer synchronization back to the transport stream synchronization manager. Otherwise, processed audio packets are passed to an elementary stream synchronization manager that attempts to synchronize the delivery of audio data through a sample rate conversion of the audio data. If the elementary synchronization manager is unable to acquire synchronization, it defers synchronization to the packetized elementary stream synchronization manager.

System for frame based audio synchronization and method thereof

In a specific embodiment of the present invention, a system and method is disclosed having a plurality of modes for providing and/or receiving compressed video data at a frame buffer memory. The modes include providing compressed video data directly from a system host system or through a direct memory access controller; or indirectly from a system host through a demultiplexer portion using one or more registers to receive and handle a transport stream. Another mode of operation includes receiving a transport stream containing compressed video data from a head end system. The compressed video data is subsequently processed through a demultiplexer portion.

System for handling compressed video data and method thereof

A system and methods are shown for generating a transport stream. An application reads a transport stream file stored in memory. The application provides access to the transport stream file to a graphics card using a multimedia peripheral port (MPP). The MPP is used to provide data from the transport stream file to a transport stream demultiplexer. The application determines a desired transmission rate from the data present between program clock references in the transport stream file. The application suspends transmissions to the transport stream demultiplexer to allow a transmission bit-rate to match the desired bit-rate. The application also suspends transmission when the receiving transport demultiplexer determines its buffers are nearly full.

System for digital stream transmission and method thereof

A system and methods are provided for presenting processed audio data and processed video data to corresponding outputs in a synchronized manner. Video and audio data from a multimedia stream are received by a processing system. The video data is processed through a video processor. The audio data is processed through an audio processor. Processed audio data is stored in memory through a VIP data port. A bus-master engine is used to delay a transfer of the audio data from memory to an output port. The delay is determined so as to allow video data enough time to be processed and output in synchronous with the audio data transferred from memory. Once the delay has been overcome, the bus-master asserts a trigger in the data bus to initiate the transfer from memory to the output port.

System for digitized audio stream synchronization and method thereof

Method for displaying data

In accordance with a specific aspect of the present invention, a compressed video stream, such as an MPEG-2 video stream, is received by a transport demultiplexor, synchronized, parsed into separate packet types, and written to buffer locations external the demultiplexor. Adaptation field is handled by a separate parser. In addition, primary elementary stream data can be handled by separate primary elementary stream parsers based upon the packet identifier of the primary elementary stream. Video packets can be parsed based upon stream identifier values. Specific packets of data are stored in one or more system memory or video memory buffers by an output controller based upon allocation table information. Private data associated with specific elementary streams or packet adaptation fields are repacketized, and written to an output buffer location. In specific implementations, the hardware associated with the system is used to acquire the data stream without any knowledge of the specific protocol of the stream. In another embodiment, the hardware is used to implement a splicing of streams of data. In yet another embodiment of the present invention, detection and/or handling of an error condition is enabled for an error capable of being present in a packet stream.

Method and system for handling errors and a system for receiving packet stream data

A system and methods are provided for a controlled transfer of a portion of a data stream between a digital storage media and a corresponding stream decoder. A data stream stored in digital storage media is accessed through an application. A FIFO is used to provide a buffer to the stream decoder. The application monitors the FIFO to determine when to send data related to the data stream from the digital storage media. The data is transferred to the buffer and passed to the stream decoder. A counter is used for dictating a period of time between sending segments of the data stored in the FIFO to the stream decoder. The rate of transfer to the stream decoder is adjusted through the counter to match a desired bit-rate associated with the data stream.

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Toronto, Canada

Branko D Kovacevic