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參數(shù)資料
| 型號： | ZR36060 |
| 廠商： | Zoran Corporation |
| 元件分類： | Codec |
| 英文描述： | Integrated JPEG Codec(集成JPEG編解碼器) |
| 中文描述： | 綜合JPEG編解碼器（集成的JPEG編解碼器） |
| 文件頁數(shù)： | 26/46頁 |
| 文件大?。?/td> | 307K |
| 代理商： | ZR36060 |
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Integrated JPEG CODEC
The compression pass is always executed with Bit Rate Control
(BRC). At the end of every compression process the ZR36060
calculates the new scale factor, and, if the FSF (Fixed Scale
Factor) bit equals zero, it writes the new scale factor in the Scale
Factor register. It uses this new value in the register as the scale
factor for compressing the next image field. The host only has to
program the initial scale factor to be used for compressing the
first field. Otherwise, if FSF=1, the ZR36060 uses a fixed scale
factor for all incoming fields.
In a compression pass the ZR36060 does not update the Alloca-
tion Factor (AF). During encoding of each block the ZR36060
calculates a measure of the spatial “activity” in this block,
denoted BACT. If the Block Accumulated Code Volume (BACV)
exceeds the specified allocation (given by BACT*AF), or if it
exceeds the Maximum Block Code Volume (MBCV), the code for
the block is truncated accordingly. Note that both means of bit
rate controlling (namely truncation due to the Allocation Factor,
or truncation due to the MBCV) cannot be set “off” directly, but
they can be practically eliminated by setting MBCV and/or AF to
their maximum values.
Note: Use of the Allocation Factor is only valid if the compression
pass follows a Statistical Pass. If only Compression Passes are
executed, the mode normally used for motion JPEG compres-
sion, the Allocation Factor must be set to its maximum value to
avoid corruption of the image.
6.7.1 Data Corruption during Compression
If during the compression of a field the ZR36060 senses a data
corruption event, it immediately asserts the DATERR output.
However, the ZR36060 continues the process until it finishes
compressing the field. At this time it asserts END and enters its
IDLE state.
1) If DATERR is not enabled as an interrupt requesting event
(i.e., it is cleared in the Interrupt Mask register), then the
ZR36060 samples START again, and if START is asserted a
new process begins.
2) If DATERR is enabled as an interrupt requesting event, JIRQ
is asserted together with the assertion of the DATERR output,
and when the ZR36060 completes the current process it enters
the WAIT-ISR state and remains “frozen” (ignoring START) until
the host reads the Interrupt Status register. At this time the
ZR36060 goes back to its IDLE state and is again ready to start
a new process, depending on START.
In both cases, DATERR is deasserted at the beginning of the
next process, i.e. simultaneously with the deassertion of END.
In compression the ZR36060 identifies a data corruption condi-
tion if:
a) the strip buffer overflows, or
b) VSYNC (leading or trailing edge controlled by the FIVedge
parameter) of the next video field arrives before END of the
current field is asserted.
6.8 Statistical Compression Pass
In this mode the ZR36060 goes through all the calculations
involved in encoding the given video, but without writing any
code to the code FIFO. That is, the ZR36060 does not assert
CCS, COE, CWE as a code master, or CBUSY as a code slave.
At the end of the process the ZR36060 writes the new scale
factor into the SF register, and the calculated AF, ACV, and ACT
values into their respective registers. Then it asserts the END
signal and returns to the IDLE state.
6.9 Auto Two-Pass Compression
In this mode the ZR36060 first executes a Statistical Compres-
sion Pass, then, without asserting END, it immediately starts a
Compression Pass. Activation of START (and FRAME if
needed) is required only for the first pass. The second pass
follows immediately with the next VSYNC, without regard for
START and FRAME. (Note that START and FRAME are only
sampled when the ZR36060 is in IDLE, and in this mode the
ZR36060 does not go into IDLE between the two passes).
6.10 Tables-Only Compression Pass
In this mode the ZR36060 produces only the abbreviated format
for table specification, that is, its code output contains no frame,
scan, or Huffman-coded segments. The output code includes
the SOI marker, table marker segment(s), optional APP and/or
COM marker segments, and the EOI marker. The process is
activated by START (possibly with FRAME), and upon comple-
tion END is asserted and the ZR36060 returns to IDLE.
Figure 36. Compression with Pulsed START
START
FRAME
state
VSYNC
IDLE
END
WAIT
ACTIVE
CMP
CMP
IDLE
2 Processed Fields
IDLE
WAIT
ACTIVE
Host decide to
compress next
field only
相關PDF資料 |
PDF描述 |
|---|---|
| ZR36060 | Circular Connector; No. of Contacts:19; Series:; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:14; Circular Contact Gender:Socket; Circular Shell Style:Cable Receptacle; Insert Arrangement:14-19 |
| ZR36060PQC | Integrated JPEG CODEC |
| ZR36067 | AV PCI CONTROLLER |
| ZR36067PQC | AV PCI CONTROLLER |
| ZR36067 | PCI Adapter Intended for Multimedia Applications on PCI Systems(PCI（外圍部件互連）適配器（用于PCI系統(tǒng)的多媒體）) |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ZR36060PQC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Integrated JPEG CODEC |
| ZR36060PQC-27 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| ZR36060PQC-29.5 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| ZR36067 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:AV PCI CONTROLLER |
| ZR36067PQC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:AV PCI CONTROLLER |
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