Apple AAC - Revision history

Logan589XP: Updated version number to 2.85.

2025-06-23T22:52:39Z

Updated version number to 2.85.

← Older revision		Revision as of 22:52, 23 June 2025
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	\| caption =		\| caption =
	\| maintainer = nu774		\| maintainer = nu774
	\| stable_release = 2.83		\| stable_release = 2.85
	\| preview_release =		\| preview_release =
	\| operating_system = Windows		\| operating_system = Windows

Logan589XP: Updated version number to 2.83.

2025-01-14T20:37:54Z

Updated version number to 2.83.

← Older revision		Revision as of 20:37, 14 January 2025
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	\| caption =		\| caption =
	\| maintainer = nu774		\| maintainer = nu774
	\| stable_release = 2.82		\| stable_release = 2.83
	\| preview_release =		\| preview_release =
	\| operating_system = Windows		\| operating_system = Windows

Logan589XP: Updated version number to 2.82.

2024-03-31T03:30:37Z

Updated version number to 2.82.

← Older revision		Revision as of 03:30, 31 March 2024
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	\| caption =		\| caption =
	\| maintainer = nu774		\| maintainer = nu774
	\| stable_release = 2.81		\| stable_release = 2.82
	\| preview_release =		\| preview_release =
	\| operating_system = Windows		\| operating_system = Windows

Logan589XP: Updated version number to 2.81.

2024-02-19T09:41:38Z

Updated version number to 2.81.

← Older revision		Revision as of 09:41, 19 February 2024
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	\| caption =		\| caption =
	\| maintainer = nu774		\| maintainer = nu774
	\| stable_release = 2.80		\| stable_release = 2.81
	\| preview_release =		\| preview_release =
	\| operating_system = Windows		\| operating_system = Windows

Logan589XP: Updated version number to 2.80.

2023-07-06T03:28:09Z

Updated version number to 2.80.

← Older revision		Revision as of 03:28, 6 July 2023
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	\| caption =		\| caption =
	\| maintainer = nu774		\| maintainer = nu774
	\| stable_release = 2.79		\| stable_release = 2.80
	\| preview_release =		\| preview_release =
	\| operating_system = Windows		\| operating_system = Windows

Artoria2e5: /* Format support */

2023-05-08T01:26:20Z

Format support

← Older revision		Revision as of 01:26, 8 May 2023
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	Actual support depends on library version and whether the program used to call the library knows how to use these formats.		Actual support depends on library version and whether the program used to call the library knows how to use these formats.
	* afconvert is clumsy but exposes almost everything.		* afconvert is clumsy but exposes almost everything.
	* QAAC only does LC and HEv1. ~~QAAC~~ can use some of the audiotoolkit filters.		* QAAC only does LC and HEv1. It can use some of the audiotoolkit filters while it works.
	* FFmpeg only knows about using Apple AAC with LC, LD, ELD, HE, and HEv2.		* FFmpeg only knows about using Apple AAC with LC, LD, ELD, HE, and HEv2.

Artoria2e5: /* Format support */

2023-05-08T01:25:34Z

Format support

← Older revision		Revision as of 01:25, 8 May 2023
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	* MPEG-4 Spatial		* MPEG-4 Spatial

	There should also be support for a number of other format, at least in decoding: Apple does not ship a standalone AAC codec, but a whole kit.		There should also be support for a number of other format, at least in decoding: Apple does not ship a standalone AAC codec, but a whole audio-processing kit.

	Actual support depends on library version and whether the program used to call the library knows how to use these formats. ~~For example,~~ FFmpeg only knows about using Apple AAC with LC, LD, ELD, HE, and HEv2.		Actual support depends on library version and whether the program used to call the library knows how to use these formats.
			* afconvert is clumsy but exposes almost everything.
			* QAAC only does LC and HEv1. QAAC can use some of the audiotoolkit filters.
			* FFmpeg only knows about using Apple AAC with LC, LD, ELD, HE, and HEv2.

	== afconvert ==		== afconvert ==

Artoria2e5: /* Format support */

2023-05-08T01:15:30Z

Format support

← Older revision		Revision as of 01:15, 8 May 2023
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	== Format support ==		== Format support ==
	Apple's CoreAudioBaseTypes lists the following AAC-derived codecs on macOS 11.3:<ref name=CABT>https://github.com/phracker/MacOSX-SDKs/blob/041600eda65c6a668f66cb7d56b7d1da3e8bcc93/MacOSX11.3.sdk/System/Library/Frameworks/CoreAudioTypes.framework/Versions/A/Headers/CoreAudioBaseTypes.h#LL391C2-L391C</ref>		Apple's CoreAudioBaseTypes lists the following AAC-derived codecs on macOS 11.3:<ref name=CABT>https://github.com/phracker/MacOSX-SDKs/blob/041600eda65c6a668f66cb7d56b7d1da3e8bcc93/MacOSX11.3.sdk/System/Library/Frameworks/CoreAudioTypes.framework/Versions/A/Headers/CoreAudioBaseTypes.h#LL391C2-L391C</ref>
	* AAC (MPEG-4 ~~baseline~~)		* AAC-LC (MPEG-4)
	* AAC-LD		* AAC-LD
	* AAC-ELD		* AAC-ELD
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	* MPEG-4 Spatial		* MPEG-4 Spatial

	There should also be support for a number of other format, at least in decoding: Apple does not ship a standalone AAC codec, but a whole kit. Actual support depends on library version and whether the program used to call the library knows how to use these formats.		There should also be support for a number of other format, at least in decoding: Apple does not ship a standalone AAC codec, but a whole kit.

			Actual support depends on library version and whether the program used to call the library knows how to use these formats. For example, FFmpeg only knows about using Apple AAC with LC, LD, ELD, HE, and HEv2.

	== afconvert ==		== afconvert ==

Artoria2e5 at 01:13, 8 May 2023

2023-05-08T01:13:40Z

← Older revision		Revision as of 01:13, 8 May 2023
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	TVBR is not available for HE-AAC.		TVBR is not available for HE-AAC.
	<~~br clear~~=~~"right"~~ />
			== Format support ==
			Apple's CoreAudioBaseTypes lists the following AAC-derived codecs on macOS 11.3:<ref name=CABT>https://github.com/phracker/MacOSX-SDKs/blob/041600eda65c6a668f66cb7d56b7d1da3e8bcc93/MacOSX11.3.sdk/System/Library/Frameworks/CoreAudioTypes.framework/Versions/A/Headers/CoreAudioBaseTypes.h#LL391C2-L391C</ref>
			* AAC (MPEG-4 baseline)
			* AAC-LD
			* AAC-ELD
			* AAC-ELD + SBR
			* HE-AAC v1 (AAC + SBR)
			* HE-AAC v2 (v1 + PS)
			* USAC
			* MPEG-4 Spatial

			There should also be support for a number of other format, at least in decoding: Apple does not ship a standalone AAC codec, but a whole kit. Actual support depends on library version and whether the program used to call the library knows how to use these formats.

	== afconvert ==		== afconvert ==
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	Options:		Options:
	;-f --file <string>:File format. Several; use 'm4af' for '.m4a' file or 'adts' for raw '.aac' file.		;-f --file <string>:File format. Several; use 'm4af' for '.m4a' file or 'adts' for raw '.aac' file.
	;-d --data <string>:Data format. Several; use 'aac' for AAC-LC. See ~~[https://superuser.com/questions/678567/afconvert-difference-between-aac-formats-aac-aace-aacf-aach-aacl-a CoreAudioTypes~~.h~~] for explanation on what the variants mean~~.		;-d --data <string>:Data format. Several; use 'aac' for AAC-LC. See CoreAudioBaseTypes.h link in footnote.<ref name=CABT/>
	;-s --strategy <0,1,2,3>:Bitrate allocation strategy. 0 for CBR, 1 for ABR, 2 for VBR_constrained, 3 for VBR		;-s --strategy <0,1,2,3>:Bitrate allocation strategy. 0 for CBR, 1 for ABR, 2 for VBR_constrained, 3 for VBR
	;-b --bitrate <n>:Bitrate in bits per second. Does nothing when used with strategy 3.		;-b --bitrate <n>:Bitrate in bits per second. Does nothing when used with strategy 3.

Artoria2e5: /* ffmpeg */

2023-05-07T23:53:10Z

ffmpeg

← Older revision		Revision as of 23:53, 7 May 2023
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	== ffmpeg ==		== ffmpeg ==
	On macOS, ffmpeg 4.4 and above can use the <code>aac_at</code> codec to use Apple AAC via the new AudioToolbox.framework. In addition to AAC-LC, HE-AAC (v1/v2), AAC-LD, and AAC-ELD are available, the same selection of profiles as FDK AAC. FFmpeg uses a 0-14 quality range to be converted to the 0-127 scale, using the expression <code>q = 127 - q * 9;</code>.<ref>https://github.com/FFmpeg/FFmpeg/blob/f009f849617ab0c2015d2a748892d55b37d378c0/libavcodec/audiotoolboxenc.c#L328		On macOS, ffmpeg 4.4 and above can use the <code>aac_at</code> codec to use Apple AAC via the new AudioToolbox.framework. In addition to AAC-LC, HE-AAC (v1/v2), AAC-LD, and AAC-ELD are available, the same selection of profiles as FDK AAC. FFmpeg uses a 0-14 quality range to be converted to the 0-127 scale, using the expression <code>q = 127 - q * 9;</code>.<ref>https://github.com/FFmpeg/FFmpeg/blob/f009f849617ab0c2015d2a748892d55b37d378c0/libavcodec/audiotoolboxenc.c#L328</ref>

	On Windows, ffmpeg's build process can be tricked into linking to an CoreAudioToolbox.dll commonly distributed alongside iTunes, using [https://github.com/dantmnf/AudioToolboxWrapper AudioToolboxWrapper].		On Windows, ffmpeg's build process can be tricked into linking to an CoreAudioToolbox.dll commonly distributed alongside iTunes, using [https://github.com/dantmnf/AudioToolboxWrapper AudioToolboxWrapper].