diff options
Diffstat (limited to 'arm-hybrid-22k/lib_src/eas_pcmdata.h')
| -rw-r--r-- | arm-hybrid-22k/lib_src/eas_pcmdata.h | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/arm-hybrid-22k/lib_src/eas_pcmdata.h b/arm-hybrid-22k/lib_src/eas_pcmdata.h new file mode 100644 index 0000000..be2f8e5 --- /dev/null +++ b/arm-hybrid-22k/lib_src/eas_pcmdata.h @@ -0,0 +1,157 @@ +/*----------------------------------------------------------------------------
+ *
+ * File:
+ * eas_pcmdata.h
+ *
+ * Contents and purpose:
+ * Data declarations for the PCM engine
+ *
+ *
+ * Copyright Sonic Network Inc. 2005
+ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + *
+ *----------------------------------------------------------------------------
+ * Revision Control:
+ * $Revision: 847 $
+ * $Date: 2007-08-27 21:30:08 -0700 (Mon, 27 Aug 2007) $
+ *----------------------------------------------------------------------------
+*/
+
+#ifndef _EAS_PCMDATA_H
+#define _EAS_PCMDATA_H
+
+/* sets the maximum number of simultaneous PCM streams */
+#ifndef MAX_PCM_STREAMS
+#define MAX_PCM_STREAMS 16
+#define PCM_STREAM_THRESHOLD (MAX_PCM_STREAMS - 4)
+#endif
+
+/* coefficents for high-pass filter in ADPCM */
+#define INTEGRATOR_COEFFICIENT 100 /* coefficient for leaky integrator */
+
+/* additional flags in S_PCM_STATE.flags used internal to module */
+#define PCM_FLAGS_EMPTY 0x01000000 /* unsigned format */
+
+/*----------------------------------------------------------------------------
+ * S_PCM_STATE
+ *
+ * Retains state information for PCM streams.
+ *----------------------------------------------------------------------------
+*/
+typedef struct s_decoder_state_tag
+{
+ EAS_I32 output; /* last output for DC offset filter */
+ EAS_I32 acc; /* accumulator for DC offset filter */
+ EAS_I32 step; /* current ADPCM step size */
+ EAS_PCM x1; /* current generated sample */
+ EAS_PCM x0; /* previous generated sample */
+} S_DECODER_STATE;
+
+typedef enum
+{
+ PCM_ENV_START = 0,
+ PCM_ENV_ATTACK,
+ PCM_ENV_DECAY,
+ PCM_ENV_SUSTAIN,
+ PCM_ENV_RELEASE,
+ PCM_ENV_END
+} E_PCM_ENV_STATE;
+
+typedef struct s_pcm_state_tag
+{
+#ifdef _CHECKED_BUILD
+ EAS_U32 handleCheck; /* signature check for checked build */
+#endif
+ EAS_FILE_HANDLE fileHandle; /* pointer to input file */
+ EAS_PCM_CALLBACK pCallback; /* pointer to callback function */
+ EAS_VOID_PTR cbInstData; /* instance data for callback function */
+ struct s_decoder_interface_tag EAS_CONST * pDecoder; /* pointer to decoder interface */
+ EAS_STATE state; /* stream state */
+ EAS_I32 time; /* media time */
+ EAS_I32 startPos; /* start of PCM stream */
+ EAS_I32 loopLocation; /* file location where loop starts */
+ EAS_I32 byteCount; /* size of file */
+ EAS_U32 loopStart; /* loop start, offset in samples from startPos */
+ /* NOTE: For CMF, we use this to store total sample size */
+ EAS_U32 loopSamples; /* total loop length, in samples, 0 means no loop */
+ /* NOTE: For CMF, non-zero means looped */
+ EAS_U32 samplesInLoop; /* samples left in the loop to play back */
+ EAS_I32 samplesTilLoop; /* samples left to play until top of loop */
+ EAS_I32 bytesLeft; /* count of bytes left in stream */
+ EAS_I32 bytesLeftLoop; /* count of bytes left in stream, value at start of loop */
+ EAS_U32 phase; /* current phase for interpolator */
+ EAS_U32 basefreq; /* frequency multiplier */
+ EAS_U32 flags; /* stream flags */
+ EAS_U32 envData; /* envelope data (and LFO data) */
+ EAS_U32 envValue; /* current envelope value */
+ EAS_U32 envScale; /* current envelope scale */
+ EAS_U32 startOrder; /* start order index, first is 0, next is 1, etc. */
+ S_DECODER_STATE decoderL; /* left (mono) ADPCM state */
+ S_DECODER_STATE decoderR; /* right ADPCM state */
+ S_DECODER_STATE decoderLLoop; /* left (mono) ADPCM state, value at start of loop */
+ S_DECODER_STATE decoderRLoop; /* right ADPCM state, value at start of loop */
+ E_PCM_ENV_STATE envState; /* current envelope state */
+ EAS_I16 volume; /* volume for stream */
+ EAS_I16 pitch; /* relative pitch in cents - zero is unity playback */
+ EAS_I16 gainLeft; /* requested gain */
+ EAS_I16 gainRight; /* requested gain */
+ EAS_I16 currentGainLeft; /* current gain for anti-zipper filter */
+ EAS_I16 currentGainRight; /* current gain for anti-zipper filter */
+ EAS_U16 blockSize; /* block size for ADPCM decoder */
+ EAS_U16 blockCount; /* block counter for ADPCM decoder */
+ EAS_U16 sampleRate; /* input sample rate */
+ EAS_U8 srcByte; /* source byte */
+ EAS_U8 msBitCount; /* count keeps track of MS bits */
+ EAS_U8 msBitMask; /* mask keeps track of MS bits */
+ EAS_U8 msBitValue; /* value keeps track of MS bits */
+ EAS_U8 msBitCountLoop; /* count keeps track of MS bits, value at loop start */
+ EAS_U8 msBitMaskLoop; /* mask keeps track of MS bits, value at loop start */
+ EAS_U8 msBitValueLoop; /* value keeps track of MS bits, value at loop start */
+ EAS_BOOL8 hiNibble; /* indicates high/low nibble is next */
+ EAS_BOOL8 hiNibbleLoop; /* indicates high/low nibble is next, value loop start */
+ EAS_U8 rateShift; /* for playback rate greater than 1.0 */
+} S_PCM_STATE;
+
+/*----------------------------------------------------------------------------
+ * S_DECODER_INTERFACE
+ *
+ * Generic interface for audio decoders
+ *----------------------------------------------------------------------------
+*/
+typedef struct s_decoder_interface_tag
+{
+ EAS_RESULT (* EAS_CONST pfInit)(EAS_DATA_HANDLE pEASData, S_PCM_STATE *pState);
+ EAS_RESULT (* EAS_CONST pfDecodeSample)(EAS_DATA_HANDLE pEASData, S_PCM_STATE *pState);
+ EAS_RESULT (* EAS_CONST pfLocate)(EAS_DATA_HANDLE pEASData, S_PCM_STATE *pState, EAS_I32 time);
+} S_DECODER_INTERFACE;
+
+
+/* header chunk for SMAF ADPCM */
+#define TAG_YAMAHA_ADPCM 0x4d776100
+#define TAG_MASK 0xffffff00
+#define TAG_RIFF_FILE 0x52494646
+#define TAG_WAVE_CHUNK 0x57415645
+#define TAG_FMT_CHUNK 0x666d7420
+
+/*----------------------------------------------------------------------------
+ * EAS_PESeek
+ *----------------------------------------------------------------------------
+ * Purpose:
+ * Locate to a particular byte in a PCM stream
+ *----------------------------------------------------------------------------
+*/
+EAS_RESULT EAS_PESeek (EAS_DATA_HANDLE pEASData, S_PCM_STATE *pState, EAS_I32 *pLocation);
+
+#endif /* _EAS_PCMDATA_H */
+
|