Compressed motion video code processor

A compressed motion video code processor for decoding a bitstream into a moving picture sequence and outputting each picture to an outside circuit in the order of display, the bitstream including an I-picture composed only of intra macro-blocks, a P-picture mixedly composed of intra macro-blocks and forward predictive macro-blocks, and a B-picture mixedly composed of intra macro-blocks, forward predictive macro-blocks, a backward predictive macro-blocks and forward and backward predictive macro-blocks, the I-picture, the P-picture and the B-picture being arranged in such a way that a reference picture to be referred to during the decoding of the each predictive macro-blocks of a predictive picture precedes the predictive picture in time, the compressed motion video code processor comprising:

• first, second and third frame memories;
• writing means for writing decoded video data of an I-picture into the first or second frame memory, writing video data of a P-picture being decoded by referring to video data in the first or second frame memory into the second or first frame memory, and writing video data of a B-picture being decoded by referring to video data in the first and second frame memories into the third frame memory;
• reading means for reading video data from the first, the second or the third frame memory in the order of display to output to an outside circuit;
• error detecting means for detecting an error in the bitstream;
• and
• error processing means for replacing data of the error portion of a current B-picture under decoding by video data of the corresponding portion of a preceding B-picture stored in the third frame memory.

A compressed motion video code processor for decoding a bitstream into a moving picture sequence and outputting each picture to an outside circuit in the order of display, the bitstream including an I-picture composed only of intra macro-blocks, a P-picture mixedly composed of intra macro-blocks and forward predictive macro-blocks, and a B-picture mixedly composed of intra macro-blocks, forward predictive macro-blocks, a backward predictive macro-blocks and forward and backward predictive macro-blocks, the I-picture, the P-picture and the B-picture being arranged in such a way that a reference picture to be referred to during the decoding of the each predictive macro-blocks of a predictive picture precedes the predictive picture in time, the compressed motion video code processor comprising:

• first, second and third frame memories;
• writing means for writing decoded video data of an I-picture into the first or second frame memory, writing video data of a P-picture being decoded by referring to video data in the first or second frame memory into the second or first frame memory, and writing video data of a B-picture being decoded by referring to video data in the first and second frame memories into the third frame memory;
• reading means for reading video data from the first, the second or the third frame memory in the order of display to output to an outside circuit;
• error detecting means for detecting an error in the bitstream;
• and
• error processing means for replacing data of the error portion of a current P-picture under decoding by video data of a corresponding portion of a picture stored in the frame memory in which the video data is not currently being written.

A compressed motion video code processor for decoding a bitstream into a moving picture sequence and outputting each picture to an outside circuit in the order of display, the bitstream including an I-picture composed only of intra macro-blocks, a P-picture mixedly composed of intra macro-blocks and forward predictive macro-blocks, and a B-picture mixedly composed of intra macro-blocks, forward predictive macro-blocks, a backward predictive macro-blocks and forward and backward predictive macro-blocks, the I-picture, the P-picture and the B-picture being arranged in such a way that a reference picture to be referred to during the decoding of the each predictive macro-blocks of a predictive picture precedes the predictive picture in time, the compressed motion video code processor comprising:

• first, second and third frame memories;
• writing means for writing decoded video data of an I-picture into the first or second frame memory, writing video data of a P-picture being decoded by referring to video data in the first or second frame memory into the second or first frame memory, and writing video data of a B-picture being decoded by referring to video data in the first and second frame memories into the third frame memory;
• reading means for reading video data from the first, the second or the third frame memory in the order of display to output to an outside circuit;
• error detecting means for detecting an error in the bitstream;
• and
• error processing means for replacing data of the error portion of a current I-picture under decoding by video data of a corresponding portion of a picture stored in the frame memory in which the video data is not currently being writtenen on condition that a picture in the same GOP or the picture not in the same GOP but has a correlation thereto has been stored in the frame memory.

A compressed motion video code processing method for decoding a bitstream into a moving picture sequence and outputting each picture to an outside circuit in the order of display, the bitstream including an I-picture composed only of intra macro-blocks, a P-picture mixedly composed of intra macro-blocks and forward predictive macro-blocks, and a B-picture mixedly composed of intra macro-blocks, forward predictive macro-blocks, a backward predictive macro-blocks and forward and backward predictive macro-blocks, the I-picture, the P-picture and the B-picture being arranged in such a way that a reference picture to be referred to during the decoding of the each predictive macro-blocks of a predictive picture precedes the predictive picture in time, the compressed motion video code processing method comprising the steps of:

• writing decoded video data of an I-picture into the first or second frame memory, writing video data of a P-picture being decoded by referring to video data in the first or second frame memory into the second or first frame memory, and writing video data of a B-picture being decoded by referring to video data in the first and second frame memories into the third frame memory;
• reading video data from the first, the second or the third frame memory in the order of display to output to an outside circuit;
• and
• replacing data of an error portion of a current picture under decoding by video data of a corresponding portion of a picture stored in one of the first, second or third frame memory, the frame memory being selected based on a picture-type of the current picture.

A compressed motion video code processor for decoding a bitstream into a moving picture sequence and outputting each picture to an outside circuit in the order of display, the bitstream including an I-picture composed only of intra macro-blocks, a P-picture mixedly composed of intra macro-blocks and forward predictive macro-blocks, and a B-picture mixedly composed of intra macro-blocks, forward predictive macro-blocks, a backward predictive macro-blocks and forward and backward predictive macro-blocks, the I-picture, the P-picture and the B-picture being arranged in such a way that a reference picture to be referred to during the decoding of the each predictive macro-blocks of a predictive picture precedes the predictive picture in time, the compressed motion video code processor comprising:

• first, second and third frame memories;
• writing means for writing decoded video data of an I-picture into the first or second frame memory, writing video data of a P-picture being decoded by referring to video data in the first or second frame memory into the second or first frame memory, and writing video data of a B-picture being decoded by referring to video data in the first and second frame memories into the third frame memory;
• reading means for reading video data from the first, the second or the third frame memory in the order of display to output to an outside circuit;
• error detecting means for detecting an error in the bitstream;
• and
• error processing means for replacing data of the error portion of a current picture under decoding by video data of a corresponding portion of a picture stored in the frame memory in which the video data is not currently being writtenen when the current picture is a P-picture, and replacing data of the error portion of a current picture under decoding by video data of a corresponding portion of a picture being positioned precedingly in time in the order of display and being stored in the frame memory when the current picture is a B-picture.

A compressed motion video code processor for decoding a bitstream into a moving picture sequence and outputting each picture to an outside circuit in the order of display, the bitstream including an I-picture composed only of intra macro-blocks, a P-picture mixedly composed of intra macro-blocks and forward predictive macro-blocks, and a B-picture mixedly composed of intra macro-blocks, forward predictive macro-blocks, a backward predictive macro-blocks and forward and backward predictive macro-blocks, the I-picture, the P-picture and the B-picture being arranged in such a way that a reference picture to be referred to during the decoding of the each predictive macro-blocks of a predictive picture precedes the predictive picture in time, the compressed motion video code processor comprising:

• first, second and third frame memories;
• an error detector for detecting an error and its picture-type in the bitstream to generate an error-detection-signal and a picture-type-signal;
• plural switches;
• and
• a controller for switching the plural switches to write decoded video data of an I-picture into the first or second frame memory, to write video data of a P-picture being decoded by referring to video data in the first or second frame memory into the second or first frame memory, to write video data of a B-picture being decoded by referring to video data in the first and second frame memories into the third frame memory, and not to write video data of a B-picture being decoded by referring to video data in the first and second frame memories into the third frame memory when the error-detection-signal of a B-picture is input from the error detector.

A compressed motion video code processor for decoding a bitstream into a moving picture sequence and outputting each picture to an outside circuit in the order of display, the bitstream including an I-picture composed only of intra macro-blocks, a P-picture mixedly composed of intra macro-blocks and forward predictive macro-blocks, and a B-picture mixedly composed of intra macro-blocks, forward predictive macro-blocks, a backward predictive macro-blocks and forward and backward predictive macro-blocks, the I-picture, the P-picture and the B-picture being arranged in such a way that a reference picture to be referred to during the decoding of the each predictive macro-blocks of a predictive picture precedes the predictive picture in time, the compressed motion video code processor comprising:

• first, second and third frame memories;
• an error detector for detecting an error and its picture-type in the bitstream to generate an error-detection-signal and a picture-type-signal;
• plural switches;
• and
• a controller for switching the plural switches to write decoded video data of an I-picture into the first or second frame memory, to write video data of a P-picture being decoded by referring to video data in the first or second frame memory into the second or first frame memory, to write video data of a B-picture being decoded by referring to video data in the first and second frame memories into the third frame memory, and to write video data stored in the first or second frame memory in which video data is not currently being written into the second or first frame memory when the error-detection-signal of a P-picture is input from the error detector.

A compressed motion video code processor for decoding a bitstream into a moving picture sequence and outputting each picture to an outside circuit in the order of display, the bitstream including an I-picture composed only of intra macro-blocks, a P-picture mixedly composed of intra macro-blocks and forward predictive macro-blocks, and a B-picture mixedly composed of intra macro-blocks, forward predictive macro-blocks, a backward predictive macro-blocks and forward and backward predictive macro-blocks, the I-picture, the P-picture and the B-picture being arranged in such a way that a reference picture to be referred to during the decoding of the each predictive macro-blocks of a predictive picture precedes the predictive picture in time, the compressed motion video code processor comprising:

• first, second and third frame memories;
• an error detector for detecting an error and its picture-type in the bitstream to generate an error-detection-signal and a picture-type-signal;
• plural switches;
• and
• a controller for switching the plural switches to write decoded video data of an I-picture into the first or second frame memory, to write video data of a P-picture being decoded by referring to video data in the first or second frame memory into the second or first frame memory, to write video data of a B-picture being decoded by referring to video data in the first and second frame memories into the third frame memory, and to write video data stored in the first or second frame memory in which video data is not currently being written on condition that a picture in the same GOP or the picture not in the same GOP but has a correlation thereto has been stored in the frame memory into the second or first frame memory when the error-detection-signal of an I-picture is input from the error detector.

A compressed motion video code processor for decoding a bitstream into a moving picture sequence and outputting each picture to an outside circuit in the order of display, the bitstream including an I-picture composed only of intra macro-blocks, a P-picture mixedly composed of intra macro-blocks and forward predictive macro-blocks, and a B-picture mixedly composed of intra macro-blocks, forward predictive macro-blocks, a backward predictive macro-blocks and forward and backward predictive macro-blocks, the I-picture, the P-picture and the B-picture being arranged in such a way that a reference picture to be referred to during the decoding of the each predictive macro-blocks of a predictive picture precedes the predictive picture in time, the compressed motion video code processor comprising:

• first, second and third frame memories;
• an error detector for detecting an error and its picture-type in the bitstream to generate an error-detection-signal and a picture-type-signal;
• plural switches;
• and
• a controller for switching the plural switches to write decoded video data of an I-picture into the first or second frame memory, to write video data of a P-picture being decoded by referring to video data in the first or second frame memory into the second or first frame memory, to write video data of a B-picture being decoded by referring to video data in the first and second frame memories into the third frame memory, and to write video data being positioned precedingly in time in the order of display and being stored in the first or second frame memory in which video data is not currently being written into the second or first frame memory when the error-detection-signal of a B-picture is input from the error detection.