Xbox ADPCM - Revision history

JayFoxRox at 16:03, 29 December 2018

2018-12-29T16:03:44Z

JayFoxRox: The original compression ratio did not respect the sample width: 65 samples (16 bit PCM) = 130 bytes, will be compressed in 36 bytes (ADPCM). 1-(36/130) = 72.3%

2017-07-26T21:08:02Z

The original compression ratio did not respect the sample width: 65 samples (16 bit PCM) = 130 bytes, will be compressed in 36 bytes (ADPCM). 1-(36/130) = 72.3%

JayFoxRox: /* Mono */

2017-06-28T20:55:28Z

‎Mono

JayFoxRox: Make table easy to copy

2017-06-28T11:51:36Z

Make table easy to copy

JayFoxRox: Removed bad space

2017-06-28T11:47:30Z

Removed bad space

JayFoxRox: /* Step-Table */

2017-06-28T11:35:04Z

‎Step-Table

JayFoxRox: /* Index-Table */

2017-06-28T11:33:32Z

‎Index-Table

JayFoxRox at 11:21, 28 June 2017

2017-06-28T11:21:52Z

JayFoxRox: /* Mono */

2017-06-28T11:15:21Z

‎Mono

JayFoxRox: /* Stereo */

2017-06-28T11:13:51Z

‎Stereo

← Older revision		Revision as of 16:03, 29 December 2018
Line 211:		Line 211:
	* [https://github.com/JayFoxRox/xbox-tools/tree/master/adpcm-decoder Tool to decode Xbox ADPCM files]		* [https://github.com/JayFoxRox/xbox-tools/tree/master/adpcm-decoder Tool to decode Xbox ADPCM files]
	* [http://samples.ffmpeg.org/game-formats/xbox-adpcm-wav/ Sample files by FFmpeg]		* [http://samples.ffmpeg.org/game-formats/xbox-adpcm-wav/ Sample files by FFmpeg]
		+
		+	[[Category:APU]]

@@ Line 8: / Line 8: @@
 This value is also stored in the 'fmt ' extra-data which is always 2 bytes, containing the Bytes <code>0x40, 0x00</code> (64 as unsigned 16-bit integer).
 Because of that, all Xbox ADPCM files will have a block alignment of 36 (Mono) or 72 (Stereo) Bytes.
-As the decoder-setup in every block contains a predictor for each channel, there will be 65 samples / channel output per block (65:36 compression ratio = 44.6% compression).
+As the decoder-setup in every block contains a predictor for each channel, there will be 65 samples / channel output per block (130:36 compression ratio = 72.3% compressed).
 Aside from what was mentioned, there are no known differences to IMA ADPCM.

@@ Line 36: / Line 36: @@
 {| class="wikitable" style="font-size:90%; text-align:center;"
 ! 32-bit word
-| colspan="8" | W0
+| colspan="8" width="20%" | W0
-| colspan="8" | W1
+| colspan="8" width="20%" | W1
-| colspan="8" | W2
+| colspan="8" width="20%" | W2
-| rowspan="3" | ...
+| rowspan="3" width="5%" | ...
-| colspan="8" | W8
+| colspan="8" width="20%" | W8
 |-
 ! Byte
@@ Line 51: / Line 51: @@
 | style="background-color:SkyBlue;" colspan="4" | P = S0
 | style="background-color:SkyBlue;" colspan="2" | SI
 | colspan="2" |
 | style="background-color:SkyBlue;" |  S2 || style="background-color:SkyBlue;" |  S1
 | style="background-color:SkyBlue;" |  S4 || style="background-color:SkyBlue;" |  S3

@@ Line 158: / Line 158: @@
 Same as IMA ADPCM
 {| class="wikitable" style="text-align: right;"
-!     ||    +0 ||    +1 ||    +2 ||    +3 ||    +4 ||    +5 ||    +6 ||    +7 ||    +8 ||    +9
 |-
-!  0
+! {{no-select}} | 0
-|     7 ||     8 ||     9 ||    10 ||    11 ||    12 ||    13 ||    14 ||    16 ||    17
+|     7{{hc}} ||     8{{hc}} ||     9{{hc}} ||    10{{hc}} ||    11{{hc}} ||    12{{hc}} ||    13{{hc}} ||    14{{hc}} ||    16{{hc}} ||    17{{hc}}
 |-
-! 10
+! {{no-select}} | 10
-|    19 ||    21 ||    23 ||    25 ||    28 ||    31 ||    34 ||    37 ||    41 ||    45
+|    19{{hc}} ||    21{{hc}} ||    23{{hc}} ||    25{{hc}} ||    28{{hc}} ||    31{{hc}} ||    34{{hc}} ||    37{{hc}} ||    41{{hc}} ||    45{{hc}}
 |-
-! 20
+! {{no-select}} | 20
-|    50 ||    55 ||    60 ||    66 ||    73 ||    80 ||    88 ||    97 ||   107 ||   118
+|    50{{hc}} ||    55{{hc}} ||    60{{hc}} ||    66{{hc}} ||    73{{hc}} ||    80{{hc}} ||    88{{hc}} ||    97{{hc}} ||   107{{hc}} ||   118{{hc}}
 |-
-! 30
+! {{no-select}} | 30
-|   130 ||   143 ||   157 ||   173 ||   190 ||   209 ||   230 ||   253 ||   279 ||   307
+|   130{{hc}} ||   143{{hc}} ||   157{{hc}} ||   173{{hc}} ||   190{{hc}} ||   209{{hc}} ||   230{{hc}} ||   253{{hc}} ||   279{{hc}} ||   307{{hc}}
 |-
-! 40
+! {{no-select}} | 40
-|   337 ||   371 ||   408 ||   449 ||   494 ||   544 ||   598 ||   658 ||   724 ||   796
+|   337{{hc}} ||   371{{hc}} ||   408{{hc}} ||   449{{hc}} ||   494{{hc}} ||   544{{hc}} ||   598{{hc}} ||   658{{hc}} ||   724{{hc}} ||   796{{hc}}
 |-
-! 50
+! {{no-select}} | 50
-|   876 ||   963 ||  1060 ||  1166 ||  1282 ||  1411 ||  1552 ||  1707 ||  1878 ||  2066
+|   876{{hc}} ||   963{{hc}} ||  1060{{hc}} ||  1166{{hc}} ||  1282{{hc}} ||  1411{{hc}} ||  1552{{hc}} ||  1707{{hc}} ||  1878{{hc}} ||  2066{{hc}}
 |-
-! 60
+! {{no-select}} | 60
-|  2272 ||  2499 ||  2749 ||  3024 ||  3327 ||  3660 ||  4026 ||  4428 ||  4871 ||  5358
+|  2272{{hc}} ||  2499{{hc}} ||  2749{{hc}} ||  3024{{hc}} ||  3327{{hc}} ||  3660{{hc}} ||  4026{{hc}} ||  4428{{hc}} ||  4871{{hc}} ||  5358{{hc}}
 |-
-! 70
+! {{no-select}} | 70
-|  5894 ||  6484 ||  7132 ||  7845 ||  8630 ||  9493 || 10442 || 11487 || 12635 || 13899
+|  5894{{hc}} ||  6484{{hc}} ||  7132{{hc}} ||  7845{{hc}} ||  8630{{hc}} ||  9493{{hc}} || 10442{{hc}} || 11487{{hc}} || 12635{{hc}} || 13899{{hc}}
 |-
-! 80
+! {{no-select}} | 80
-| 15289 || 16818 || 18500 || 20350 || 22385 || 24623 || 27086 || 29794 || 32767 ||
+| 15289{{hc}} || 16818{{hc}} || 18500{{hc}} || 20350{{hc}} || 22385{{hc}} || 24623{{hc}} || 27086{{hc}} || 29794{{hc}} || 32767       ||
 |}

@@ Line 152: / Line 152: @@
 |-
 ! {{no-select}} | 8
-| -1{{hc}} || -1{{hc}} || -1 {{hc}} || -1{{hc}} || 2{{hc}} || 4{{hc}} || 6{{hc}} || 8
+| -1{{hc}} || -1{{hc}} || -1{{hc}} || -1{{hc}} || 2{{hc}} || 4{{hc}} || 6{{hc}} || 8
 |}

← Older revision		Revision as of 11:35, 28 June 2017
Line 158:		Line 158:

	Same as IMA ADPCM		Same as IMA ADPCM
		+
		+	{{FIXME\|reason=Use no-select and hc macros}}

	{\| class="wikitable" style="text-align: right;"		{\| class="wikitable" style="text-align: right;"

← Older revision		Revision as of 11:21, 28 June 2017
Line 1:		Line 1:
−	Xbox used it's own WAV file format to encode ADPCM ~~data~~. This format is often called Xbox ADPCM.	+	Xbox used it's own WAV file format to encode data using [[Wikipedia:Adaptive differential pulse-code modulation\|ADPCM]]. This format is often called Xbox ADPCM.

	Standard IMA ADPCM WAV files would use format code 0x0011, whereas Xbox ADPCM files use format-code 0x0069.		Standard IMA ADPCM WAV files would use format code 0x0011, whereas Xbox ADPCM files use format-code 0x0069.

@@ Line 40: / Line 40: @@
 | colspan="8" | W2
 | rowspan="3" | ...
 | colspan="8" | W8
 |-
@@ Line 47: / Line 46: @@
 | colspan="2" | B4 || colspan="2" | B5 || colspan="2" | B6 || colspan="2" | B7
 | colspan="2" | B8 || colspan="2" | B9 || colspan="2" | B10 || colspan="2" | B11
 | colspan="2" | B32 || colspan="2" | B33 || colspan="2" | B34 || colspan="2" | B35
 |-
@@ Line 62: / Line 60: @@
 | style="background-color:SkyBlue;" | S14 || style="background-color:SkyBlue;" | S13
 | style="background-color:SkyBlue;" | S16 || style="background-color:SkyBlue;" | S15
 | style="background-color:SkyBlue;" | S58 || style="background-color:SkyBlue;" | S57
 | style="background-color:SkyBlue;" | S60 || style="background-color:SkyBlue;" | S59

@@ Line 82: / Line 82: @@
 | colspan="8" | W2
 | colspan="8" | W3
 |-
 ! Byte
@@ Line 89: / Line 88: @@
 | colspan="2" | B8 || colspan="2" | B9 || colspan="2" | B10 || colspan="2" | B11
 | colspan="2" | B12 || colspan="2" | B13 || colspan="2" | B14 || colspan="2" | B15
 |-
 ! Meaning
@@ Line 106: / Line 104: @@
 | style="background-color:Tomato;" |  S6 || style="background-color:Tomato;" |  S5
 | style="background-color:Tomato;" |  S8 || style="background-color:Tomato;" |  S7
 |}
 ...