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AAC Decoder: introduce time domain limiter

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Introduce time domain limiter. The module is per default enabled for all
  AAC-LC and HE-AAC v1/2 streams. For all ER-AAC-LD and ER-AAC-ELD streams
  the limiter is disabled per default. The feature can be en- or disabled
  via dynamic API parameter. Note that the limiter introduces an additional
  output delay which depends on the module parameters and the streams
  sampling rate.

Bug 9428126

Change-Id: I299a072340b33e2c324facbd347a72c8de3d380e
This commit is contained in:
Jean-Michel Trivi
2013-12-30 16:01:08 -08:00
parent 629f60c0e7
commit 603f48ab99
11 changed files with 3300 additions and 2325 deletions
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10
libAACdec/include/aacdecoder_lib.h
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@@ -436,6 +436,16 @@ typedef enum
2: Create a dual mono output signal from channel 2. \n
3: Create a dual mono output signal by mixing both channels (L' = R' = 0.5*Ch1 + 0.5*Ch2). */
AAC_PCM_OUTPUT_CHANNEL_MAPPING = 0x0003, /*!< Output buffer channel ordering. 0: MPEG PCE style order, 1: WAV file channel order (default). */
AAC_PCM_LIMITER_ENABLE = 0x0004, /*!< Enable signal level limiting. \n
-1: Auto-config. Enable limiter for all non-lowdelay configurations by default. \n
0: Disable limiter in general. \n
1: Enable limiter always.
It is recommended to call the decoder with a AACDEC_CLRHIST flag to reset all states when
the limiter switch is changed explicitly. */
AAC_PCM_LIMITER_ATTACK_TIME = 0x0005, /*!< Signal level limiting attack time in ms.
Default confguration is 15 ms. Adjustable range from 1 ms to 15 ms. */
AAC_PCM_LIMITER_RELEAS_TIME = 0x0006, /*!< Signal level limiting release time in ms.
Default configuration is 50 ms. Adjustable time must be larger than 0 ms. */
AAC_PCM_MIN_OUTPUT_CHANNELS = 0x0011, /*!< Minimum number of PCM output channels. If higher than the number of encoded audio channels,
a simple channel extension is applied. \n
-1, 0: Disable channel extenstion feature. The decoder output contains the same number of