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158 lines
7.5 KiB
158 lines
7.5 KiB
4 months ago
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/*----------------------------------------------------------------------------
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*
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* File:
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* eas_pcmdata.h
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*
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* Contents and purpose:
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* Data declarations for the PCM engine
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*
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*
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* Copyright Sonic Network Inc. 2005
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*----------------------------------------------------------------------------
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* Revision Control:
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* $Revision: 847 $
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* $Date: 2007-08-27 21:30:08 -0700 (Mon, 27 Aug 2007) $
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*----------------------------------------------------------------------------
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*/
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#ifndef _EAS_PCMDATA_H
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#define _EAS_PCMDATA_H
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/* sets the maximum number of simultaneous PCM streams */
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#ifndef MAX_PCM_STREAMS
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#define MAX_PCM_STREAMS 16
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#define PCM_STREAM_THRESHOLD (MAX_PCM_STREAMS - 4)
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#endif
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/* coefficents for high-pass filter in ADPCM */
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#define INTEGRATOR_COEFFICIENT 100 /* coefficient for leaky integrator */
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/* additional flags in S_PCM_STATE.flags used internal to module */
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#define PCM_FLAGS_EMPTY 0x01000000 /* unsigned format */
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/*----------------------------------------------------------------------------
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* S_PCM_STATE
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*
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* Retains state information for PCM streams.
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*----------------------------------------------------------------------------
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*/
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typedef struct s_decoder_state_tag
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{
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EAS_I32 output; /* last output for DC offset filter */
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EAS_I32 acc; /* accumulator for DC offset filter */
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EAS_I32 step; /* current ADPCM step size */
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EAS_PCM x1; /* current generated sample */
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EAS_PCM x0; /* previous generated sample */
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} S_DECODER_STATE;
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typedef enum
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{
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PCM_ENV_START = 0,
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PCM_ENV_ATTACK,
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PCM_ENV_DECAY,
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PCM_ENV_SUSTAIN,
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PCM_ENV_RELEASE,
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PCM_ENV_END
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} E_PCM_ENV_STATE;
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typedef struct s_pcm_state_tag
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{
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#ifdef _CHECKED_BUILD
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EAS_U32 handleCheck; /* signature check for checked build */
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#endif
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EAS_FILE_HANDLE fileHandle; /* pointer to input file */
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EAS_PCM_CALLBACK pCallback; /* pointer to callback function */
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EAS_VOID_PTR cbInstData; /* instance data for callback function */
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struct s_decoder_interface_tag EAS_CONST * pDecoder; /* pointer to decoder interface */
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EAS_STATE state; /* stream state */
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EAS_I32 time; /* media time */
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EAS_I32 startPos; /* start of PCM stream */
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EAS_I32 loopLocation; /* file location where loop starts */
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EAS_I32 byteCount; /* size of file */
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EAS_U32 loopStart; /* loop start, offset in samples from startPos */
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/* NOTE: For CMF, we use this to store total sample size */
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EAS_U32 loopSamples; /* total loop length, in samples, 0 means no loop */
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/* NOTE: For CMF, non-zero means looped */
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EAS_U32 samplesInLoop; /* samples left in the loop to play back */
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EAS_I32 samplesTilLoop; /* samples left to play until top of loop */
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EAS_I32 bytesLeft; /* count of bytes left in stream */
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EAS_I32 bytesLeftLoop; /* count of bytes left in stream, value at start of loop */
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EAS_U32 phase; /* current phase for interpolator */
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EAS_U32 basefreq; /* frequency multiplier */
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EAS_U32 flags; /* stream flags */
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EAS_U32 envData; /* envelope data (and LFO data) */
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EAS_U32 envValue; /* current envelope value */
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EAS_U32 envScale; /* current envelope scale */
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EAS_U32 startOrder; /* start order index, first is 0, next is 1, etc. */
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S_DECODER_STATE decoderL; /* left (mono) ADPCM state */
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S_DECODER_STATE decoderR; /* right ADPCM state */
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S_DECODER_STATE decoderLLoop; /* left (mono) ADPCM state, value at start of loop */
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S_DECODER_STATE decoderRLoop; /* right ADPCM state, value at start of loop */
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E_PCM_ENV_STATE envState; /* current envelope state */
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EAS_I16 volume; /* volume for stream */
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EAS_I16 pitch; /* relative pitch in cents - zero is unity playback */
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EAS_I16 gainLeft; /* requested gain */
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EAS_I16 gainRight; /* requested gain */
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EAS_I16 currentGainLeft; /* current gain for anti-zipper filter */
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EAS_I16 currentGainRight; /* current gain for anti-zipper filter */
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EAS_U16 blockSize; /* block size for ADPCM decoder */
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EAS_U16 blockCount; /* block counter for ADPCM decoder */
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EAS_U16 sampleRate; /* input sample rate */
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EAS_U8 srcByte; /* source byte */
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EAS_U8 msBitCount; /* count keeps track of MS bits */
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EAS_U8 msBitMask; /* mask keeps track of MS bits */
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EAS_U8 msBitValue; /* value keeps track of MS bits */
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EAS_U8 msBitCountLoop; /* count keeps track of MS bits, value at loop start */
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EAS_U8 msBitMaskLoop; /* mask keeps track of MS bits, value at loop start */
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EAS_U8 msBitValueLoop; /* value keeps track of MS bits, value at loop start */
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EAS_BOOL8 hiNibble; /* indicates high/low nibble is next */
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EAS_BOOL8 hiNibbleLoop; /* indicates high/low nibble is next, value loop start */
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EAS_U8 rateShift; /* for playback rate greater than 1.0 */
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} S_PCM_STATE;
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/*----------------------------------------------------------------------------
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* S_DECODER_INTERFACE
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*
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* Generic interface for audio decoders
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*----------------------------------------------------------------------------
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*/
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typedef struct s_decoder_interface_tag
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{
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EAS_RESULT (* EAS_CONST pfInit)(EAS_DATA_HANDLE pEASData, S_PCM_STATE *pState);
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EAS_RESULT (* EAS_CONST pfDecodeSample)(EAS_DATA_HANDLE pEASData, S_PCM_STATE *pState);
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EAS_RESULT (* EAS_CONST pfLocate)(EAS_DATA_HANDLE pEASData, S_PCM_STATE *pState, EAS_I32 time);
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} S_DECODER_INTERFACE;
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/* header chunk for SMAF ADPCM */
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#define TAG_YAMAHA_ADPCM 0x4d776100
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#define TAG_MASK 0xffffff00
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#define TAG_RIFF_FILE 0x52494646
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#define TAG_WAVE_CHUNK 0x57415645
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#define TAG_FMT_CHUNK 0x666d7420
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/*----------------------------------------------------------------------------
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* EAS_PESeek
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*----------------------------------------------------------------------------
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* Purpose:
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* Locate to a particular byte in a PCM stream
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*----------------------------------------------------------------------------
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*/
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EAS_RESULT EAS_PESeek (EAS_DATA_HANDLE pEASData, S_PCM_STATE *pState, EAS_I32 *pLocation);
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#endif /* _EAS_PCMDATA_H */
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