CN100444638C - Multiple data stream output for multimedia data stream processing - Google Patents

Abstract

A multimedia data processing system generates digital data stream outputs with various compression ratios or compression formats to cope with various storage space or transmission bandwidth limitations, thereby reducing the number of repeated processing of digital data streams and reducing the loss of central processing unit resources.

Description

Multi-stream output for multimedia stream processing

technical field

The present invention relates to a system for processing multimedia data, and in particular to a system for transmitting and storing multimedia data.

Background technique

Multimedia data is mainly divided into video data and audio data. In terms of image data, it is further divided into static images and dynamic videos. Voice data is divided into speech data and audio data. Roughly speaking, static image data and voice data are both subsets of video data and audio data. Static image data is mainly because the data does not change over time, and voice data is because the human voice signal is in the frequency band and bandwidth. and statistical properties are special. These features are used in digital signal processing.

However, because it is impossible to predict the storage space and transmission bandwidth limitations that will be faced after signal processing, the processed (compressed) digital signal is often restored (decompressed) before storage or transmission, and then according to The desired compression ratio is processed. In this way, not only the computing resources of the central processing unit are wasted, but the processing efficiency of the system is reduced, and the repeated processing also reduces the quality of the signal and distorts the multimedia data.

Fig. 1 shows a block diagram of an existing multimedia data processing system. As shown, a raw signal (element 102) enters a compressor (element 104) and is processed by the compressor (element 104) into a digital data stream (element 106). Wherein, the original signal may include digital or analog signal; and the compressor may be an Application Specific Integrated Circuit (ASIC)/Digital Signal Processor (DSP) chip, which may be dedicated to processing audio/video data. The digital data stream (element 106) is then passed to a decompressor/compressor (element 112). Wherein, the decompression/compressor (element 112) can be a signal processing system, a computer or a server, and the compression ratio obtained by decompressing/compressing the digital data stream one or more times is based on the desired The storage space of the next device to store (for example, the target of storage - a hard disk (element 114)), or the next path to be transferred (for example, a wired/wireless network (element 116) or a mobile phone (element 118) communication network) bandwidth limitations. This digital data stream (element 106) is compressed into a digital data stream (element 120, 122 or 124) having a suitable compression ratio for transmission or storage to a next destination, e.g., a hard disk (element 114), a network ( element 116) or a mobile phone (element 118).

Fig. 2 shows a flowchart of an existing multimedia data processing method. As shown in the figure, after starting transmission (step 202), an original signal is received by a compressor (step 204), and the original signal is compressed into a single digital data stream by the compressor (step 206), and the The single digital data stream is sent to a decompressor/compressor (step 207). Then, the decompressor/compressor determines the compression ratio of the digital data stream based on the storage space or transmission bandwidth of the next device to be stored or the next path to be transmitted (step 208 ). For example, if it is determined that the digital data stream needs to be compressed with a high compression ratio due to a small storage space or a narrow transmission bandwidth, the digital data stream is first decompressed (step 210), and then compressed into a high compression ratio Digital data stream (step 212). Finally, the digital data stream with high compression ratio is stored or transmitted (step 214). Similarly, if it is necessary to compress the digital data stream with other levels of compression ratio, similar steps are also followed.

To sum up, because it is impossible to predict the storage space and transmission bandwidth limitations that need to be faced after the signal processing, so after step 208 in Figure 2, the processed digital signal must be restored/decompressed (step 210, 220 or 230), and then process/compress again according to the required compression ratio (step 212, 222 or 232), and finally store or transmit the recompressed digital data stream (step 214, 224 or 234). The above-mentioned complicated system not only repeats the processing process, but also wastes the computing resources of the central processing unit, which reduces the processing efficiency of the system. In addition, repeated processing also reduces the quality of the signal, resulting in distortion of multimedia data.

Contents of the invention

Therefore, the technical problem to be solved by the present invention is to provide data streams with different data volumes for different data volumes in the digital signal processor. In terms of video, after obtaining the original data, the digital signal processor can perform scaling of the original image and different processing architectures or standards for different data volumes to generate multiple data streams with different data volumes. In terms of audio, multiple data streams with different data volumes can be generated with different processing architectures or standards according to different audio characteristics and available bandwidth or storage space. In order to save the time for the central processing unit to restore and reprocess the data, reduce the distortion of the data, and further simplify the system.

According to a preferred embodiment of the present invention, a multimedia data processing system is proposed, comprising at least: an original signal; and a compressor, which processes the original signal into several digital data streams with different compression ratios or compression formats, wherein, According to the bandwidth limitation of the next path to be transmitted, select a digital data stream with a compression ratio or compression format suitable for the bandwidth limitation of the next path from the several digital data streams with different compression ratios or compression formats , to pass through this next route.

According to another preferred embodiment of the present invention, a kind of multimedia data processing method is proposed, at least including the following steps: a compression step, which compresses a received original signal into several digital data with different compression ratios or compression formats Stream; a selection step, which, according to the bandwidth limitation of the next path to be transmitted, selects a compression ratio suitable for the bandwidth limitation of the next path from the several digital data streams with different compression ratios or compression formats or a digital data stream in a compressed format; and a transmission step, which transmits the selected digital data stream with a compression ratio or a compressed format suitable for the bandwidth limitation of the next path through the next path.

Application of the present invention has the following advantages:

First, save the computing resources of the central processing unit, so that the system processing efficiency is improved,

Second, without repeated compression and decompression processing, the quality of the signal can be maintained without distortion of the multimedia data.

Third, after the present invention is integrated into a special-purpose integrated circuit/digital signal processor (ASIC/DSP) chip, multiple compression ratios or compression formats can be provided according to user settings, system default values, or system built-in programs. A stream of digital data that can be used in a variety of situations without additional means for compression or decompression.

Fourth, streamline the process of system processing multimedia data and improve system performance.

Description of drawings

In order to make the above and other objects, features, advantages and embodiments of the present invention more obvious and understandable, the detailed description of the accompanying drawings is as follows:

Fig. 1 shows a block diagram of an existing multimedia data processing system;

Fig. 2 shows a flow chart of an existing multimedia data processing method;

Fig. 3 shows a block diagram of a multimedia data processing system according to a preferred embodiment of the present invention; and

Fig. 4 shows a flowchart of a multimedia data processing method according to another preferred embodiment of the present invention.

Among them, reference signs:

102-Original Signal

104-compressor

106 - Digital Data Stream

112 - decompressor/compressor

114-hard disk

116-Network

118 - Mobile phone

120 - digital data stream 1

122 - Digital Data Stream 2

124 - Digital Data Stream 3

202-Start

204-The original signal is received by the compressor

206-The raw signal is compressed by a compressor into a single digital data stream

207 - Transmit single digital data stream to decompressor/compressor

208-Determine the compression ratio of digital data stream by storage space or transmission bandwidth

210 - decompress digital data stream

212-compressed digital data stream into digital data stream with high compression ratio

214-Store or transmit digital data stream with high compression ratio

220 - decompress digital data stream

222-compressed digital data stream is a digital data stream with medium compression ratio

224 - digital data stream with compression ratio in storage or transmission

230 - Decompress digital data stream

232-compressed digital data stream into a digital data stream with low compression ratio

234-Store or transmit digital data streams with low compression ratio

302-Original Signal

304-compressor

306 - Digital Data Stream 1

308 - Digital Data Stream 2

310 - Digital Data Stream 3

314-hard disk

316-Network

318-Mobile Phone

402-Start

404-The original signal is received by the compressor

406-The original signal is compressed by the compressor into digital data streams with several compression ratios or compression formats

408-Determine the compression ratio or compression format of digital data streams based on storage space or transmission bandwidth

414-Storage or transmission of digital data streams with high compression ratio

424 - Digital data stream with compression ratio in storage or transmission

434-Storage or transmission of digital data streams with low compression ratio

Detailed ways

Please refer to FIG. 3 , which shows a block diagram of a multimedia data processing system according to a preferred embodiment of the present invention. As shown, an original signal (element 302) enters a compressor (element 304), and is processed by the compressor (element 304) into several (for example, three in this embodiment) with different compression ratios or different A digital data stream in a compressed format, e.g. digital data stream 1 (element 306) in a low compression ratio (e.g. 10%) or a first compression format (e.g. M-JPEG), a medium compression ratio (e.g. 1%) or a second compression A digital data stream 2 (element 308) in a format (eg MPEG-4) and a digital data stream 3 (element 310) in a high compression ratio (eg 0.6%) or a third compression format (eg H.264). In one embodiment, the compressor (element 304) can simultaneously generate several identical and different digital data streams with different compression ratios or different compression formats, for example, digital data stream 1 and digital data stream 2 both have the same a first compression ratio or a first compression format, and the digital data stream 3 has a second compression ratio or a second compression format different from the first compression ratio or first compression format. Wherein, the original signal may include a digital or analog signal; and the compressor may be an Application Specific Integrated Circuit (ASIC) or a Digital Signal Processor (DSP) chip, which may be dedicated to processing audio/video data. Afterwards, the digital data streams 1, 2 and 3 (elements 306, 308 and 310) are all generated, and the digital data streams 1, 2 and 3 (elements 306, 308 and 310) of different compression ratios or compression formats The selection based on the storage space of the next device to be stored (for example, the target of storage - a hard disk (element 314)), or the next path to be transferred (for example, a wired/wireless network (element 316) or a mobile Bandwidth limitation of the communication network of the telephone (element 318).

In addition, the compressor may also include: a setting interface to set several digital data streams with different compression ratios or compression formats to be compressed, and the setting interface may be a web page or a The menu of the software program; a system default value, which sets several digital data streams with different compression ratios or compression formats to be compressed; A digital data stream with a suitable compression ratio or compressed format is selected from among the digital data streams in the compressed format.

To sum up, when encountering different storage spaces or transmission bandwidths, according to a preferred embodiment of the present invention, the digital data streams 1, 2 and 3 (element 306 , 308 and 310) to directly select one with a suitable compression ratio or compression format for transmission or storage to the next destination, for example, hard disk (element 314), network (element 316) or mobile phone (element 318).

Fig. 4 shows a flowchart of a multimedia data processing method according to another preferred embodiment of the present invention. As shown in the figure, after starting transmission (step 402), the original signal is received by a compressor (step 404), and the original signal is compressed into several types (for example, three types in this embodiment) Compression ratio or digital data stream in compressed format (step 406). Wherein, the compression method in step 406 may further include: the step of setting different types of compression ratios or compression formats by the user through a setting interface; Steps for setting different types of compression ratios or compression formats; and using a system default value to determine several digital data streams to be compressed with different compression ratios or compression formats. Then, based on the storage space or transmission bandwidth of the next device to be stored or the next channel to be transmitted, a digital data stream with a suitable compression ratio or compression format is selected from the several digital data streams (step 408 ). Wherein, the selection method in step 408 also includes: a system built-in program determines how to select a digital data stream with a suitable compression ratio or compression format from the several digital data streams with different compression ratios or compression formats.

For example, if it is determined that the digital data stream needs to be compressed with a high compression ratio or a compressed format due to a small storage space or a narrow transmission bandwidth, a digital data stream with a high compression ratio or a compressed format can be directly selected for Store or transmit (step 414). Similarly, if it is necessary to compress the digital data stream with other levels of compression ratio or compression format, for example, when a digital data stream with a medium compression ratio is needed, store or transmit the digital data stream with a medium compression ratio (step 424); and when a digital data stream with a low compression ratio is required, store or transmit the digital data stream with a low compression ratio (step 424). For other situations, follow similar steps.

As can be seen from the preferred embodiments of the present invention described above, the application of the present invention has the following advantages:

First, the computing resources of the central processing unit are saved, so that the processing efficiency of the system is improved.

Second, without repeated compression and decompression processing, the quality of the signal can be maintained without distortion of the multimedia data.

Third, after the present invention is integrated into a special-purpose integrated circuit/digital signal processor (ASIC/DSP) chip, multiple compression ratios or compression formats can be provided according to user settings, system default values, or system built-in programs The digital data stream can be used in many situations without the need for additional devices (eg, a signal processing system, computer or server) as decompressors/compressors (element 112).

Fourth, streamline the process of system processing multimedia data and improve system performance.

Of course, the present invention can also have other various embodiments, and those skilled in the art can make various corresponding changes and deformations according to the present invention without departing from the spirit and essence of the present invention, but these corresponding Changes and deformations should belong to the scope of protection of the appended claims of the present invention.

Claims (11)

1. A multimedia data processing system, characterized in that at least comprising: an original signal; and a compressor, which processes the original signal into multiple digital data streams with different compression ratios or compression formats; According to the bandwidth limitation of the next path to be transmitted, the compressor selects a compression ratio or compression format suitable for the bandwidth limitation of the next path from the multiple digital data streams with different compression ratios or compression formats. A stream of digital data in a compressed format for transmission over this next path. 2. The system of claim 1, wherein the compressor is an application specific integrated circuit or a digital signal processor chip. 3. The system according to claim 1, further comprising a setting interface for setting the multiple digital data streams to be compressed with different compression ratios or compression formats. 4. The system according to claim 3, wherein the setting interface is a webpage or a menu of a software program built in the system. 5. The system according to claim 1, wherein the compressor further includes a system default value, which sets several digital data streams to be compressed with different compression ratios or compression formats. 6. The system according to claim 1, wherein the compressor further includes a system built-in program, which can select one with a suitable compression ratio from the multiple digital data streams with different compression ratios or compression formats. stream of digital data in compressed or compressed format. 7. A multimedia data processing method, comprising at least the following steps: A compression step, which compresses a received original signal into a plurality of digital data streams with different compression ratios or compression formats; A selection step, according to the bandwidth limitation of the next path to be transmitted, select a compression ratio or compression format suitable for the bandwidth limitation of the next path from the multiple digital data streams with different compression ratios or compression formats a digital data stream in compressed format; and A transmitting step, which transmits the selected digital data stream with a compression ratio or a compressed format suitable for the bandwidth limitation of the next path through the next path. 8. The method according to claim 7, wherein the compressing step further comprises: a step of setting different types of compression ratios or compression formats by the user through a setting interface. 9. The method according to claim 7, wherein the compressing step further comprises: a step of setting different types of compression ratios or compression formats by the user via a web page or a menu of a software program built in the system. 10. The method according to claim 7, wherein the compressing step further comprises: using a system default value to determine several digital data streams to be compressed with different compression ratios or compression formats. 11. The method according to claim 7, wherein the selecting step further comprises: a system built-in program can select a suitable compression format from the multiple digital data streams with different compression ratios or compression formats. stream of digital data in compressed or compressed format.

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