Apple ProRes - Revision history

Kostya: /* Alpha plane coding */

2013-05-24T05:29:04Z

Alpha plane coding

← Older revision		Revision as of 22:29, 23 May 2013
Line 363:		Line 363:

	[[Category:Video Codecs]]		[[Category:Video Codecs]]
			[[Category:Intermediate Video Codecs]]

2013-05-17T18:07:20Z

Frame header

← Older revision		Revision as of 11:07, 17 May 2013
Line 158:		Line 158:
	\|\| Indicates source pixel format.		\|\| Indicates source pixel format.
	\|-		\|-
	\| align="center" \| 4 bits \|\| align="center" \| alpha_info \|\| ~~align="center" \|~~ \|\| Used in combination with alpha channel coding.		\| align="center" \| 4 bits \|\| align="center" \| alpha_info \|\|
			* 0 - no alpha
			* 1 - 8-bit alpha
			* 2 - 16-bit alpha
			\|\| Used in combination with alpha channel coding.
	\|-		\|-
	\| align="center" \| 1 byte \|\| align="center" \| reserved2 \|\| align="center" \| 0 \|\| Ignored.		\| align="center" \| 1 byte \|\| align="center" \| reserved2 \|\| align="center" \| 0 \|\| Ignored.

2013-05-17T18:05:35Z

Slice coding

← Older revision		Revision as of 11:05, 17 May 2013
Line 330:		Line 330:
	46, 39, 47, 54, 61, 62, 55, 63,		46, 39, 47, 54, 61, 62, 55, 63,

			==== Alpha plane coding ====

			Both alpha depths are coded the same, the only difference is delta value bit size (4 for 8-bit alpha, 7 for 16-bit alpha).

			alpha = (1 << bit_depth) - 1;
			while (!all_coeffs_decoded) {
			if (get_bit())
			val = get_bits(bit_depth);
			else {
			val = get_bits(bit_depth == 16 ? 7 : 4);
			sign = val & 1;
			val = (val + 2) >> 1;
			if (sign)
			val = -val;
			}
			alpha_val = (alpha_val + val) & ((1 << bit_depth) - 1);
			*dst++ = alpha_val;
			if (get_bit()) {
			run = get_bits(4);
			if (!run)
			run = get_bits(11);
			for (i = 0; i < run; i++)
			*dst++ = run;
			}
			}

			This decodes slice alpha data line by line.

	[[Category:Video Codecs]]		[[Category:Video Codecs]]

2012-06-29T16:58:51Z

updated whitepaper link

← Older revision		Revision as of 09:58, 29 June 2012
Line 6:		Line 6:
	** Apple ProRes 4444: 'ap4h' ('h4pa' in little-endian)		** Apple ProRes 4444: 'ap4h' ('h4pa' in little-endian)
	* Company: [[Apple]]		* Company: [[Apple]]
	* Whitepaper: ~~http://web.archive.org/web/20101205002240/~~http://images.apple.com/~~finalcutstudio~~/~~resources~~/~~white_papers~~/~~L342568A_ProRes_WP~~.pdf		* Whitepaper: http://images.apple.com/support/finalcutpro/docs/Apple-ProRes-White-Paper-July-2009.pdf
	* New Whitepaper introducing ProRes LT/Proxy/4444: http://images.apple.com/finalcutstudio/docs/Apple_ProRes_White_Paper_July_2009.pdf		* New Whitepaper introducing ProRes LT/Proxy/4444: http://images.apple.com/finalcutstudio/docs/Apple_ProRes_White_Paper_July_2009.pdf
	* Samples: http://samples.mplayerhq.hu/V-codecs/HCPA/		* Samples: http://samples.mplayerhq.hu/V-codecs/HCPA/

2011-09-21T01:55:47Z

Frame header

@@ Line 130: / Line 130: @@
 || Frame structure flags.
 |-
-| align="center" | 3 bytes || align="center" | reserved1 || align="center" | 0 || Ignored in the decoder v1. It has some meaning in the version 2.0 that need to be clarified.
+| align="center" | 1 byte || align="center" | reserved1 || align="center" | 0 || Ignored.
 |-
 | align="center" | 1 byte || align="center" | colorMatrix ||
@@ Line 137: / Line 141: @@
 || Color matrix ID for color conversion between YUV and RGB (see below).
 |-
-| align="center" | 2 bytes || align="center" | reserved2 || align="center" | 0 || Ignored.
+| align="center" | 4 bits || align="center" | src_pix_fmt ||
 |-
 | align="center" | 1 byte || align="center" | <span id="QMatFlags">QMatFlags</span> ||
@@ Line 149: / Line 172: @@
 | align="center" | 64 bytes || align="center" | <span id="QMatChroma">QMatChroma</span> ||  || Custom quantization matrix for chrominance. Only present if indicated by the bit "D" of the [[#QMatFlags|QMatFlags]].
 |}
 === Picture layout ===

2011-09-19T05:10:34Z

Slice header: typo

← Older revision		Revision as of 22:10, 18 September 2011
Line 203:		Line 203:
	\| align="center" \| 2 bytes \|\| align="center" \| luma_data_size \|\| size of the luma bitstream in bytes.		\| align="center" \| 2 bytes \|\| align="center" \| luma_data_size \|\| size of the luma bitstream in bytes.
	\|-		\|-
	\| align="center" \| 2 ~~bits~~ \|\| align="center" \| u_data_size \|\| size of the chroma U bitstream in bytes.		\| align="center" \| 2 bytes \|\| align="center" \| u_data_size \|\| size of the chroma U bitstream in bytes.
	\|-		\|-
	\|}		\|}

2011-09-19T01:27:10Z

Slice header

← Older revision		Revision as of 18:27, 18 September 2011
Line 192:		Line 192:

	==== Slice header ====		==== Slice header ====

	~~bits 0-2 unused?~~
	~~bits 3-7 header size~~
	~~1 byte quantiser scale (1-224)~~
	~~2 bytes luma data size~~
	~~2 bytes U data size~~

	{\| border="1" cellpadding="5" style="border-collapse: collapse; border-style: dashed; border-color: #2f6fab;"		{\| border="1" cellpadding="5" style="border-collapse: collapse; border-style: dashed; border-color: #2f6fab;"

2011-09-19T01:26:54Z

Slice header

@@ Line 198: / Line 198: @@
 bytes  luma data size
 bytes  U data size
 ==== Codeword encoding scheme ====

2011-09-19T01:19:02Z

Field/Picture header

@@ Line 150: / Line 150: @@
 |}
-=== Field/Picture header ===
 This header is present for every picture (field).

2011-09-19T00:55:56Z

Frame header

← Older revision		Revision as of 17:55, 18 September 2011
Line 121:		Line 121:
	\| align="center" \| 1 byte \|\| align="center" \| frameFlags \|\|		\| align="center" \| 1 byte \|\| align="center" \| frameFlags \|\|
	layout: AAxxBBxx where		layout: AAxxBBxx where
	* bits AA = ~~sample depth?~~		* bits AA = chrominance factor (picture format):
			** "2" - 422
			** "3" - 444
	* bits BB = frame type:		* bits BB = frame type:
	** "0" - progressive		** "0" - progressive