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/*----------------------------------------------------------------------------
*
* File:
* eas_wavefile.c
*
* Contents and purpose:
* This file implements the wave file parser.
*
* 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: 852 $
* $Date: 2007-09-04 11:43:49 -0700 (Tue, 04 Sep 2007) $
*----------------------------------------------------------------------------
*/
#include "eas_data.h"
#include "eas_report.h"
#include "eas_host.h"
#include "eas_config.h"
#include "eas_parser.h"
#include "eas_pcm.h"
#include "eas_wavefile.h"
/* lint is choking on the ARM math.h file, so we declare the log10 function here */
extern double log10(double x);
/* increase gain to compensate for loss in mixer */
#define WAVE_GAIN_OFFSET 6
/* constant for 1200 / log10(2.0) */
#define PITCH_CENTS_CONVERSION 3986.313714
/*----------------------------------------------------------------------------
* WAVE file defines
*----------------------------------------------------------------------------
*/
/* RIFF chunks */
#define CHUNK_TYPE(a,b,c,d) ( \
( ((EAS_U32)(a) & 0xFF) << 24 ) \
+ ( ((EAS_U32)(b) & 0xFF) << 16 ) \
+ ( ((EAS_U32)(c) & 0xFF) << 8 ) \
+ ( ((EAS_U32)(d) & 0xFF) ) )
#define CHUNK_RIFF CHUNK_TYPE('R','I','F','F')
#define CHUNK_WAVE CHUNK_TYPE('W','A','V','E')
#define CHUNK_FMT CHUNK_TYPE('f','m','t',' ')
#define CHUNK_DATA CHUNK_TYPE('d','a','t','a')
#define CHUNK_LIST CHUNK_TYPE('L','I','S','T')
#define CHUNK_INFO CHUNK_TYPE('I','N','F','O')
#define CHUNK_INAM CHUNK_TYPE('I','N','A','M')
#define CHUNK_ICOP CHUNK_TYPE('I','C','O','P')
#define CHUNK_IART CHUNK_TYPE('I','A','R','T')
/* wave file format identifiers */
#define WAVE_FORMAT_PCM 0x0001
#define WAVE_FORMAT_IMA_ADPCM 0x0011
/* file size for streamed file */
#define FILE_SIZE_STREAMING 0x80000000
/*----------------------------------------------------------------------------
* prototypes
*----------------------------------------------------------------------------
*/
static EAS_RESULT WaveCheckFileType (S_EAS_DATA *pEASData, EAS_FILE_HANDLE fileHandle, EAS_VOID_PTR *pHandle, EAS_I32 offset);
static EAS_RESULT WavePrepare (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData);
static EAS_RESULT WaveState (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData, EAS_STATE *pState);
static EAS_RESULT WaveClose (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData);
static EAS_RESULT WaveReset (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData);
static EAS_RESULT WaveLocate (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData, EAS_I32 time, EAS_BOOL *pParserLocate);
static EAS_RESULT WavePause (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData);
static EAS_RESULT WaveResume (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData);
static EAS_RESULT WaveSetData (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData, EAS_I32 param, EAS_I32 value);
static EAS_RESULT WaveGetData (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData, EAS_I32 param, EAS_I32 *pValue);
static EAS_RESULT WaveParseHeader (S_EAS_DATA *pEASData, EAS_FILE_HANDLE fileHandle, S_WAVE_STATE *pWaveData);
static EAS_RESULT WaveGetMetaData (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData, EAS_I32 *pMediaLength);
#ifdef MMAPI_SUPPORT
static EAS_RESULT SaveFmtChunk (S_EAS_DATA *pEASData, EAS_FILE_HANDLE fileHandle, S_WAVE_STATE *pWaveData, EAS_I32 size);
#endif
/*----------------------------------------------------------------------------
*
* EAS_Wave_Parser
*
* This structure contains the functional interface for the Wave file parser
*----------------------------------------------------------------------------
*/
const S_FILE_PARSER_INTERFACE EAS_Wave_Parser =
{
WaveCheckFileType,
WavePrepare,
NULL,
NULL,
WaveState,
WaveClose,
WaveReset,
WavePause,
WaveResume,
WaveLocate,
WaveSetData,
WaveGetData,
WaveGetMetaData
};
/*----------------------------------------------------------------------------
* WaveCheckFileType()
*----------------------------------------------------------------------------
* Purpose:
* Check the file type to see if we can parse it
*
* Inputs:
* pEASData - pointer to overall EAS data structure
* handle - pointer to file handle
*
* Outputs:
*
*
* Side Effects:
*
*----------------------------------------------------------------------------
*/
static EAS_RESULT WaveCheckFileType (S_EAS_DATA *pEASData, EAS_FILE_HANDLE fileHandle, EAS_VOID_PTR *pHandle, EAS_I32 offset)
{
S_WAVE_STATE *pWaveData;
/* zero the memory to insure complete initialization */
*pHandle = NULL;
/* read the file header */
if (WaveParseHeader(pEASData, fileHandle, NULL) == EAS_SUCCESS)
{
/* check for static memory allocation */
if (pEASData->staticMemoryModel)
pWaveData = EAS_CMEnumData(EAS_CM_WAVE_DATA);
else
pWaveData = EAS_HWMalloc(pEASData->hwInstData, sizeof(S_WAVE_STATE));
if (!pWaveData)
return EAS_ERROR_MALLOC_FAILED;
EAS_HWMemSet(pWaveData, 0, sizeof(S_WAVE_STATE));
/* return a pointer to the instance data */
pWaveData->fileHandle = fileHandle;
pWaveData->fileOffset = offset;
*pHandle = pWaveData;
}
return EAS_SUCCESS;
}
/*----------------------------------------------------------------------------
* WavePrepare()
*----------------------------------------------------------------------------
* Purpose:
* Prepare to parse the file.
*
* Inputs:
* pEASData - pointer to overall EAS data structure
* handle - pointer to file handle
*
* Outputs:
*
*
* Side Effects:
*
*----------------------------------------------------------------------------
*/
static EAS_RESULT WavePrepare (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData)
{
S_WAVE_STATE *pWaveData;
EAS_RESULT result;
/* validate parser state */
pWaveData = (S_WAVE_STATE*) pInstData;
if (pWaveData->streamHandle != NULL)
return EAS_ERROR_NOT_VALID_IN_THIS_STATE;
/* back to start of file */
pWaveData->time = 0;
if ((result = EAS_HWFileSeek(pEASData->hwInstData, pWaveData->fileHandle, pWaveData->fileOffset)) != EAS_SUCCESS)
return result;
/* parse the file header */
if ((result = WaveParseHeader(pEASData, pWaveData->fileHandle, pWaveData)) != EAS_SUCCESS)
return result;
return EAS_SUCCESS;
}
/*----------------------------------------------------------------------------
* WaveState()
*----------------------------------------------------------------------------
* Purpose:
* Returns the current state of the stream
*
* Inputs:
* pEASData - pointer to overall EAS data structure
* handle - pointer to file handle
* pState - pointer to variable to store state
*
* Outputs:
*
*
* Side Effects:
*
* Notes:
* This interface is also exposed in the internal library for use by the other modules.
*----------------------------------------------------------------------------
*/
static EAS_RESULT WaveState (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData, EAS_STATE *pState)
{
S_WAVE_STATE *pWaveData;
/* return current state */
pWaveData = (S_WAVE_STATE*) pInstData;
if (pWaveData->streamHandle)
return EAS_PEState(pEASData, pWaveData->streamHandle, pState);
/* if no stream handle, and time is not zero, we are done */
if (pWaveData->time > 0)
*pState = EAS_STATE_STOPPED;
else
*pState = EAS_STATE_OPEN;
return EAS_SUCCESS;
}
/*----------------------------------------------------------------------------
* WaveClose()
*----------------------------------------------------------------------------
* Purpose:
* Close the file and clean up
*
* Inputs:
* pEASData - pointer to overall EAS data structure
* handle - pointer to file handle
*
* Outputs:
*
*
* Side Effects:
*
*----------------------------------------------------------------------------
*/
static EAS_RESULT WaveClose (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData)
{
S_WAVE_STATE *pWaveData;
EAS_RESULT result;
pWaveData = (S_WAVE_STATE*) pInstData;
/* close the stream */
if (pWaveData->streamHandle)
{
if ((result = EAS_PEClose(pEASData, pWaveData->streamHandle)) != EAS_SUCCESS)
return result;
pWaveData->streamHandle = NULL;
}
/* if using dynamic memory, free it */
if (!pEASData->staticMemoryModel)
{
#ifdef MMAPI_SUPPORT
/* need to free the fmt chunk */
if (pWaveData->fmtChunk != NULL)
EAS_HWFree(pEASData->hwInstData, pWaveData->fmtChunk);
#endif
/* free the instance data */
EAS_HWFree(pEASData->hwInstData, pWaveData);
}
return EAS_SUCCESS;
}
/*----------------------------------------------------------------------------
* WaveReset()
*----------------------------------------------------------------------------
* Purpose:
* Reset the sequencer. Used for locating backwards in the file.
*
* Inputs:
* pEASData - pointer to overall EAS data structure
* handle - pointer to file handle
*
* Outputs:
*
*
* Side Effects:
*
*----------------------------------------------------------------------------
*/
static EAS_RESULT WaveReset (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData)
{
EAS_PCM_HANDLE streamHandle;
/* reset to first byte of data in the stream */
streamHandle = ((S_WAVE_STATE*)pInstData)->streamHandle;
if (streamHandle)
return EAS_PEReset(pEASData, streamHandle);
return EAS_ERROR_NOT_VALID_IN_THIS_STATE;
}
/*----------------------------------------------------------------------------
* WaveLocate()
*----------------------------------------------------------------------------
* Purpose:
* Rewind/fast-forward in file.
*
* Inputs:
* pEASData - pointer to overall EAS data structure
* handle - pointer to file handle
* time - time (in msecs)
*
* Outputs:
*
*
* Side Effects:
*
*----------------------------------------------------------------------------
*/
/*lint -esym(715, pParserLocate) reserved for future use */
static EAS_RESULT WaveLocate (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData, EAS_I32 time, EAS_BOOL *pParserLocate)
{
EAS_PCM_HANDLE streamHandle;
/* reset to first byte of data in the stream */
streamHandle = ((S_WAVE_STATE*)pInstData)->streamHandle;
if (streamHandle)
return EAS_PELocate(pEASData, streamHandle, time);
return EAS_ERROR_NOT_VALID_IN_THIS_STATE;
}
/*----------------------------------------------------------------------------
* WavePause()
*----------------------------------------------------------------------------
* Purpose:
* Mute and stop rendering a PCM stream. Sets the gain target to zero and stops the playback
* at the end of the next audio frame.
*
* Inputs:
* pEASData - pointer to EAS library instance data
* handle - pointer to S_WAVE_STATE for this stream
*
* Outputs:
*
*
* Side Effects:
*
*----------------------------------------------------------------------------
*/
/*lint -esym(715, pEASData) reserved for future use */
static EAS_RESULT WavePause (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData)
{
EAS_PCM_HANDLE streamHandle;
/* pause the stream */
streamHandle = ((S_WAVE_STATE*)pInstData)->streamHandle;
if (streamHandle)
return EAS_PEPause(pEASData, streamHandle);
return EAS_ERROR_NOT_VALID_IN_THIS_STATE;
}
/*----------------------------------------------------------------------------
* WaveResume()
*----------------------------------------------------------------------------
* Purpose:
* Resume rendering a PCM stream. Sets the gain target back to its
* previous setting and restarts playback at the end of the next audio
* frame.
*
* Inputs:
* pEASData - pointer to EAS library instance data
* handle - pointer to S_WAVE_STATE for this stream
*
* Outputs:
*
*
* Side Effects:
*
*----------------------------------------------------------------------------
*/
/*lint -esym(715, pEASData) reserved for future use */
static EAS_RESULT WaveResume (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData)
{
EAS_PCM_HANDLE streamHandle;
/* resume the stream */
streamHandle = ((S_WAVE_STATE*)pInstData)->streamHandle;
if (streamHandle)
return EAS_PEResume(pEASData, streamHandle);
return EAS_ERROR_NOT_VALID_IN_THIS_STATE;
}
/*----------------------------------------------------------------------------
* WaveSetData()
*----------------------------------------------------------------------------
* Purpose:
*
* Inputs:
* pEASData - pointer to EAS library instance data
* handle - pointer to S_WAVE_STATE for this stream
*
* Outputs:
*
*
* Side Effects:
*
*----------------------------------------------------------------------------
*/
static EAS_RESULT WaveSetData (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData, EAS_I32 param, EAS_I32 value)
{
S_WAVE_STATE *pWaveData = (S_WAVE_STATE*) pInstData;
switch (param)
{
/* set metadata callback */
case PARSER_DATA_METADATA_CB:
EAS_HWMemCpy(&pWaveData->metadata, (void*) value, sizeof(S_METADATA_CB));
return EAS_SUCCESS;
case PARSER_DATA_PLAYBACK_RATE:
value = (EAS_I32) (PITCH_CENTS_CONVERSION * log10((double) value / (double) (1 << 28)));
return EAS_PEUpdatePitch(pEASData, pWaveData->streamHandle, (EAS_I16) value);
case PARSER_DATA_VOLUME:
return EAS_PEUpdateVolume(pEASData, pWaveData->streamHandle, (EAS_I16) value);
default:
return EAS_ERROR_INVALID_PARAMETER;
}
}
/*----------------------------------------------------------------------------
* WaveGetData()
*----------------------------------------------------------------------------
* Purpose:
*
* Inputs:
* pEASData - pointer to EAS library instance data
* handle - pointer to S_WAVE_STATE for this stream
*
* Outputs:
*
*
* Side Effects:
*
*----------------------------------------------------------------------------
*/
/*lint -esym(715, pEASData) reserved for future use */
static EAS_RESULT WaveGetData (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData, EAS_I32 param, EAS_I32 *pValue)
{
S_WAVE_STATE *pWaveData;
pWaveData = (S_WAVE_STATE*) pInstData;
switch (param)
{
/* return file type as WAVE */
case PARSER_DATA_FILE_TYPE:
*pValue = pWaveData->fileType;
break;
#ifdef MMAPI_SUPPORT
/* return pointer to 'fmt' chunk */
case PARSER_DATA_FORMAT:
*pValue = (EAS_I32) pWaveData->fmtChunk;
break;
#endif
case PARSER_DATA_GAIN_OFFSET:
*pValue = WAVE_GAIN_OFFSET;
break;
default:
return EAS_ERROR_INVALID_PARAMETER;
}
return EAS_SUCCESS;
}
/*----------------------------------------------------------------------------
* WaveParseHeader()
*----------------------------------------------------------------------------
* Purpose:
* Parse the WAVE file header.
*
* Inputs:
* pEASData - pointer to EAS library instance data
* handle - pointer to S_WAVE_STATE for this stream
*
* Outputs:
*
*
* Side Effects:
*
*----------------------------------------------------------------------------
*/
static EAS_RESULT WaveParseHeader (S_EAS_DATA *pEASData, EAS_FILE_HANDLE fileHandle, S_WAVE_STATE *pWaveData)
{
S_PCM_OPEN_PARAMS params;
EAS_RESULT result;
EAS_U32 tag;
EAS_U32 fileSize;
EAS_U32 size;
EAS_I32 pos;
EAS_I32 audioOffset;
EAS_U16 usTemp;
EAS_BOOL parseDone;
EAS_U32 avgBytesPerSec;
/* init some data (and keep lint happy) */
params.sampleRate = 0;
params.size = 0;
audioOffset = 0;
params.decoder = 0;
params.blockSize = 0;
params.pCallbackFunc = NULL;
params.cbInstData = NULL;
params.loopSamples = 0;
params.fileHandle = fileHandle;
params.volume = 0x7fff;
params.envData = 0;
avgBytesPerSec = 8000;
/* check for 'RIFF' tag */
if ((result = EAS_HWGetDWord(pEASData->hwInstData, fileHandle, &tag, EAS_TRUE)) != EAS_FALSE)
return result;
if (tag != CHUNK_RIFF)
return EAS_ERROR_UNRECOGNIZED_FORMAT;
/* get size */
if ((result = EAS_HWGetDWord(pEASData->hwInstData, fileHandle, &fileSize, EAS_FALSE)) != EAS_FALSE)
return result;
/* check for 'WAVE' tag */
if ((result = EAS_HWGetDWord(pEASData->hwInstData, fileHandle, &tag, EAS_TRUE)) != EAS_FALSE)
return result;
if (tag != CHUNK_WAVE)
return EAS_ERROR_UNRECOGNIZED_FORMAT;
/* this is enough to say we recognize the file */
if (pWaveData == NULL)
return EAS_SUCCESS;
/* check for streaming mode */
pWaveData->flags = 0;
pWaveData->mediaLength = -1;
pWaveData->infoChunkPos = -1;
pWaveData->infoChunkSize = -1;
if (fileSize== FILE_SIZE_STREAMING)
{
pWaveData->flags |= PCM_FLAGS_STREAMING;
fileSize = 0x7fffffff;
}
/* find out where we're at */
if ((result = EAS_HWFilePos(pEASData->hwInstData, fileHandle, &pos)) != EAS_SUCCESS)
return result;
fileSize -= 4;
parseDone = EAS_FALSE;
for (;;)
{
/* get tag and size for next chunk */
if ((result = EAS_HWGetDWord(pEASData->hwInstData, fileHandle, &tag, EAS_TRUE)) != EAS_FALSE)
return result;
if ((result = EAS_HWGetDWord(pEASData->hwInstData, fileHandle, &size, EAS_FALSE)) != EAS_FALSE)
return result;
/* process chunk */
pos += 8;
switch (tag)
{
case CHUNK_FMT:
#ifdef MMAPI_SUPPORT
if ((result = SaveFmtChunk(pEASData, fileHandle, pWaveData, (EAS_I32) size)) != EAS_SUCCESS)
return result;
#endif
/* get audio format */
if ((result = EAS_HWGetWord(pEASData->hwInstData, fileHandle, &usTemp, EAS_FALSE)) != EAS_FALSE)
return result;
if (usTemp == WAVE_FORMAT_PCM)
{
params.decoder = EAS_DECODER_PCM;
pWaveData->fileType = EAS_FILE_WAVE_PCM;
}
else if (usTemp == WAVE_FORMAT_IMA_ADPCM)
{
params.decoder = EAS_DECODER_IMA_ADPCM;
pWaveData->fileType = EAS_FILE_WAVE_IMA_ADPCM;
}
else
return EAS_ERROR_UNRECOGNIZED_FORMAT;
/* get number of channels */
if ((result = EAS_HWGetWord(pEASData->hwInstData, fileHandle, &usTemp, EAS_FALSE)) != EAS_FALSE)
return result;
if (usTemp == 2)
pWaveData->flags |= PCM_FLAGS_STEREO;
else if (usTemp != 1)
return EAS_ERROR_UNRECOGNIZED_FORMAT;
/* get sample rate */
if ((result = EAS_HWGetDWord(pEASData->hwInstData, fileHandle, &params.sampleRate, EAS_FALSE)) != EAS_FALSE)
return result;
/* get stream rate */
if ((result = EAS_HWGetDWord(pEASData->hwInstData, fileHandle, &avgBytesPerSec, EAS_FALSE)) != EAS_FALSE)
return result;
/* get block alignment */
if ((result = EAS_HWGetWord(pEASData->hwInstData, fileHandle, &usTemp, EAS_FALSE)) != EAS_FALSE)
return result;
params.blockSize = usTemp;
/* get bits per sample */
if ((result = EAS_HWGetWord(pEASData->hwInstData, fileHandle, &usTemp, EAS_FALSE)) != EAS_FALSE)
return result;
/* PCM, must be 8 or 16 bit samples */
if (params.decoder == EAS_DECODER_PCM)
{
if (usTemp == 8)
pWaveData->flags |= PCM_FLAGS_8_BIT | PCM_FLAGS_UNSIGNED;
else if (usTemp != 16)
return EAS_ERROR_UNRECOGNIZED_FORMAT;
}
/* for IMA ADPCM, we only support mono 4-bit ADPCM */
else
{
if ((usTemp != 4) || (pWaveData->flags & PCM_FLAGS_STEREO))
return EAS_ERROR_UNRECOGNIZED_FORMAT;
}
break;
case CHUNK_DATA:
audioOffset = pos;
if (pWaveData->flags & PCM_FLAGS_STREAMING)
{
params.size = 0x7fffffff;
parseDone = EAS_TRUE;
}
else
{
params.size = (EAS_I32) size;
params.loopStart = size;
/* use more accurate method if possible */
if (size <= (0x7fffffff / 1000))
pWaveData->mediaLength = (EAS_I32) ((size * 1000) / avgBytesPerSec);
else
pWaveData->mediaLength = (EAS_I32) (size / (avgBytesPerSec / 1000));
}
break;
case CHUNK_LIST:
/* get the list type */
if ((result = EAS_HWGetDWord(pEASData->hwInstData, fileHandle, &tag, EAS_TRUE)) != EAS_FALSE)
return result;
if (tag == CHUNK_INFO)
{
pWaveData->infoChunkPos = pos + 4;
pWaveData->infoChunkSize = (EAS_I32) size - 4;
}
break;
default:
{ /* dpp: EAS_ReportEx(_EAS_SEVERITY_INFO, "WaveParseHeader: %c%c%c%c chunk - %d byte(s) ignored\n",
(char) (tag >> 24), (char) (tag >> 16), (char) (tag >> 8), (char) tag, size); */ }
break;
}
if (parseDone)
break;
/* subtract header size */
fileSize -= 8;
/* account for zero-padding on odd length chunks */
if (size & 1)
size++;
/* this check works for files with odd length last chunk and no zero-pad */
if (size >= fileSize)
{
if (size > fileSize)
{ /* dpp: EAS_ReportEx(_EAS_SEVERITY_INFO, "WaveParseHeader: '%c%c%c%c' chunk size exceeds length of file or is not zero-padded\n",
(char) (tag >> 24), (char) (tag >> 16), (char) (tag >> 8), (char) tag, size); */ }
break;
}
/* subtract size of data chunk (including any zero-pad) */
fileSize -= size;
/* seek to next chunk */
pos += (EAS_I32) size;
if ((result = EAS_HWFileSeek(pEASData->hwInstData, fileHandle, pos)) != EAS_SUCCESS)
return result;
}
/* check for valid header */
if ((params.sampleRate == 0) || (params.size == 0))
return EAS_ERROR_UNRECOGNIZED_FORMAT;
/* save the pertinent information */
pWaveData->audioOffset = audioOffset;
params.flags = pWaveData->flags;
/* seek to data */
if ((result = EAS_HWFileSeek(pEASData->hwInstData, fileHandle, audioOffset)) != EAS_SUCCESS)
return result;
/* open a stream in the PCM engine */
return EAS_PEOpenStream(pEASData, &params, &pWaveData->streamHandle);
}
/*----------------------------------------------------------------------------
* WaveGetMetaData()
*----------------------------------------------------------------------------
* Purpose:
* Process the INFO chunk and return metadata to host
*----------------------------------------------------------------------------
*/
static EAS_RESULT WaveGetMetaData (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData, EAS_I32 *pMediaLength)
{
S_WAVE_STATE *pWaveData;
EAS_RESULT result;
EAS_I32 pos;
EAS_U32 size;
EAS_I32 infoSize;
EAS_U32 tag;
EAS_I32 restorePos;
E_EAS_METADATA_TYPE metaType;
EAS_I32 metaLen;
/* get current position so we can restore it */
pWaveData = (S_WAVE_STATE*) pInstData;
/* return media length */
*pMediaLength = pWaveData->mediaLength;
/* did we encounter an INFO chunk? */
if (pWaveData->infoChunkPos < 0)
return EAS_SUCCESS;
if ((result = EAS_HWFilePos(pEASData->hwInstData, pWaveData->fileHandle, &restorePos)) != EAS_SUCCESS)
return result;
/* offset to start of first chunk in INFO chunk */
pos = pWaveData->infoChunkPos;
infoSize = pWaveData->infoChunkSize;
/* read all the chunks in the INFO chunk */
for (;;)
{
/* seek to next chunk */
if ((result = EAS_HWFileSeek(pEASData->hwInstData, pWaveData->fileHandle, pos)) != EAS_SUCCESS)
return result;
/* get tag and size for next chunk */
if ((result = EAS_HWGetDWord(pEASData->hwInstData, pWaveData->fileHandle, &tag, EAS_TRUE)) != EAS_FALSE)
return result;
if ((result = EAS_HWGetDWord(pEASData->hwInstData, pWaveData->fileHandle, &size, EAS_FALSE)) != EAS_FALSE)
return result;
/* process chunk */
pos += 8;
metaType = EAS_METADATA_UNKNOWN;
switch (tag)
{
case CHUNK_INAM:
metaType = EAS_METADATA_TITLE;
break;
case CHUNK_IART:
metaType = EAS_METADATA_AUTHOR;
break;
case CHUNK_ICOP:
metaType = EAS_METADATA_COPYRIGHT;
break;
default:
{ /* dpp: EAS_ReportEx(_EAS_SEVERITY_INFO, "WaveParseHeader: %c%c%c%c chunk - %d byte(s) ignored\n",
(char) (tag >> 24), (char) (tag >> 16), (char) (tag >> 8), (char) tag, size); */ }
break;
}
/* process known metadata */
if (metaType != EAS_METADATA_UNKNOWN)
{
metaLen = pWaveData->metadata.bufferSize - 1;
if (metaLen > (EAS_I32) size)
metaLen = (EAS_I32) size;
if ((result = EAS_HWReadFile(pEASData->hwInstData, pWaveData->fileHandle, pWaveData->metadata.buffer, metaLen, &metaLen)) != EAS_SUCCESS)
return result;
pWaveData->metadata.buffer[metaLen] = 0;
pWaveData->metadata.callback(metaType, pWaveData->metadata.buffer, pWaveData->metadata.pUserData);
}
/* subtract this block */
if (size & 1)
size++;
infoSize -= (EAS_I32) size + 8;
if (infoSize == 0)
break;
pos += (EAS_I32) size;
}
/* restore original position */
return EAS_HWFileSeek(pEASData->hwInstData, pWaveData->fileHandle, restorePos);
}
#ifdef MMAPI_SUPPORT
/*----------------------------------------------------------------------------
* SaveFmtChunk()
*----------------------------------------------------------------------------
* Purpose:
* Save the fmt chunk for the MMAPI library
*----------------------------------------------------------------------------
*/
static EAS_RESULT SaveFmtChunk (S_EAS_DATA *pEASData, EAS_FILE_HANDLE fileHandle, S_WAVE_STATE *pWaveData, EAS_I32 fmtSize)
{
EAS_RESULT result;
EAS_I32 pos;
EAS_I32 count;
/* save current file position */
if ((result = EAS_HWFilePos(pEASData->hwInstData, fileHandle, &pos)) != EAS_SUCCESS)
return result;
/* allocate a chunk of memory */
pWaveData->fmtChunk = EAS_HWMalloc(pEASData->hwInstData, fmtSize);
if (!pWaveData->fmtChunk)
return EAS_ERROR_MALLOC_FAILED;
/* read the fmt chunk into memory */
if ((result = EAS_HWReadFile(pEASData->hwInstData, fileHandle, pWaveData->fmtChunk, fmtSize, &count)) != EAS_SUCCESS)
return result;
if (count != fmtSize)
return EAS_ERROR_FILE_READ_FAILED;
/* restore file position */
return EAS_HWFileSeek(pEASData->hwInstData, fileHandle, pos);
}
#endif