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AAC Decoder: flush/seek improvements

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Improve flushing and seeking.
Add field to the API stream info structure signaling the additional output
 delay for flushing and delay compensation.

Bug 9428126

Change-Id: I808412905563ea3de50a2e77a9b5dfee829cd2ed
This commit is contained in:
Jean-Michel Trivi
2014-05-20 17:24:06 -07:00
parent fb2e845179
commit af967fcc55
7 changed files with 108 additions and 26 deletions
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26
libAACdec/include/aacdecoder_lib.h
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@@ -532,18 +532,18 @@ typedef enum
*/
typedef struct
{
/* These three members are the only really relevant ones for the user. */
/* These five members are the only really relevant ones for the user. */
INT sampleRate; /*!< The samplerate in Hz of the fully decoded PCM audio signal (after SBR processing). */
INT frameSize; /*!< The frame size of the decoded PCM audio signal. \n
1024 or 960 for AAC-LC \n
2048 or 1920 for HE-AAC (v2) \n
512 or 480 for AAC-LD and AAC-ELD */
INT numChannels; /*!< The number of output audio channels in the decoded and interleaved PCM audio signal. */
AUDIO_CHANNEL_TYPE *pChannelType; /*!< Audio channel type of each output audio channel. */
UCHAR *pChannelIndices; /*!< Audio channel index for each output audio channel.
AUDIO_CHANNEL_TYPE *pChannelType; /*!< Audio channel type of each output audio channel. */
UCHAR *pChannelIndices; /*!< Audio channel index for each output audio channel.
See ISO/IEC 13818-7:2005(E), 8.5.3.2 Explicit channel mapping using a program_config_element() */
/* Decoder internal members. */
INT aacSampleRate; /*!< sampling rate in Hz without SBR (from configuration info). */
INT aacSampleRate; /*!< Sampling rate in Hz without SBR (from configuration info). */
INT profile; /*!< MPEG-2 profile (from file header) (-1: not applicable (e. g. MPEG-4)). */
AUDIO_OBJECT_TYPE aot; /*!< Audio Object Type (from ASC): is set to the appropriate value for MPEG-2 bitstreams (e. g. 2 for AAC-LC). */
INT channelConfig; /*!< Channel configuration (0: PCE defined, 1: mono, 2: stereo, ... */
@@ -556,7 +556,9 @@ typedef struct
AUDIO_OBJECT_TYPE extAot; /*!< Extension Audio Object Type (from ASC) */
INT extSamplingRate; /*!< Extension sampling rate in Hz (from ASC) */
UINT flags; /*!< Copy if internal flags. Only to be written by the decoder, and only to be read externally. */
UINT outputDelay; /*!< The number of samples the output is additionally delayed by the decoder. */
UINT flags; /*!< Copy of internal flags. Only to be written by the decoder, and only to be read externally. */
SCHAR epConfig; /*!< epConfig level (from ASC): only level 0 supported, -1 means no ER (e. g. AOT=2, MPEG-2 AAC, etc.) */
@@ -681,11 +683,15 @@ aacDecoder_Fill ( HANDLE_AACDECODER self,
const UINT bufferSize[],
UINT *bytesValid );
#define AACDEC_CONCEAL 1 /*!< Flag for aacDecoder_DecodeFrame(): do not consider new input data. Do concealment. */
#define AACDEC_FLUSH 2 /*!< Flag for aacDecoder_DecodeFrame(): Do not consider new input data. Flush filterbanks (output delayed audio). */
#define AACDEC_INTR 4 /*!< Flag for aacDecoder_DecodeFrame(): Signal an input bit stream data discontinuity. Resync any internals as necessary. */
#define AACDEC_CLRHIST 8 /*!< Flag for aacDecoder_DecodeFrame(): Clear all signal delay lines and history buffers.
Caution: This can cause discontinuities in the output signal. */
#define AACDEC_CONCEAL 1 /*!< Flag for aacDecoder_DecodeFrame(): Trigger the built-in error concealment module \
to generate a substitute signal for one lost frame. New input data will not be
considered. */
#define AACDEC_FLUSH 2 /*!< Flag for aacDecoder_DecodeFrame(): Flush all filterbanks to get all delayed audio \
without having new input data. Thus new input data will not be considered.*/
#define AACDEC_INTR 4 /*!< Flag for aacDecoder_DecodeFrame(): Signal an input bit stream data discontinuity. \
Resync any internals as necessary. */
#define AACDEC_CLRHIST 8 /*!< Flag for aacDecoder_DecodeFrame(): Clear all signal delay lines and history buffers.\
CAUTION: This can cause discontinuities in the output signal. */
/**
* \brief Decode one audio frame