/*---------------------------------------------------------------------------- * * File: * eas_smf.c * * Contents and purpose: * SMF Type 0 and 1 File Parser * * For SMF timebase analysis, see "MIDI Sequencer Analysis.xls". * * 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: 803 $ * $Date: 2007-08-01 09:57:00 -0700 (Wed, 01 Aug 2007) $ *---------------------------------------------------------------------------- */ #include "eas_data.h" #include "eas_miditypes.h" #include "eas_parser.h" #include "eas_report.h" #include "eas_host.h" #include "eas_midi.h" #include "eas_config.h" #include "eas_vm_protos.h" #include "eas_smfdata.h" #include "eas_smf.h" #ifdef JET_INTERFACE #include "jet_data.h" #endif //3 dls: The timebase for this module is adequate to keep MIDI and //3 digital audio synchronized for only a few minutes. It should be //3 sufficient for most mobile applications. If better accuracy is //3 required, more fractional bits should be added to the timebase. static const EAS_U8 smfHeader[] = { 'M', 'T', 'h', 'd' }; /* local prototypes */ static EAS_RESULT SMF_GetVarLenData (EAS_HW_DATA_HANDLE hwInstData, EAS_FILE_HANDLE fileHandle, EAS_U32 *pData); static EAS_RESULT SMF_ParseMetaEvent (S_EAS_DATA *pEASData, S_SMF_DATA *pSMFData, S_SMF_STREAM *pSMFStream); static EAS_RESULT SMF_ParseSysEx (S_EAS_DATA *pEASData, S_SMF_DATA *pSMFData, S_SMF_STREAM *pSMFStream, EAS_U8 f0, EAS_INT parserMode); static EAS_RESULT SMF_ParseEvent (S_EAS_DATA *pEASData, S_SMF_DATA *pSMFData, S_SMF_STREAM *pSMFStream, EAS_INT parserMode); static EAS_RESULT SMF_GetDeltaTime (EAS_HW_DATA_HANDLE hwInstData, S_SMF_STREAM *pSMFStream); static void SMF_UpdateTime (S_SMF_DATA *pSMFData, EAS_U32 ticks); /*---------------------------------------------------------------------------- * * SMF_Parser * * This structure contains the functional interface for the SMF parser *---------------------------------------------------------------------------- */ const S_FILE_PARSER_INTERFACE EAS_SMF_Parser = { SMF_CheckFileType, SMF_Prepare, SMF_Time, SMF_Event, SMF_State, SMF_Close, SMF_Reset, SMF_Pause, SMF_Resume, NULL, SMF_SetData, SMF_GetData, NULL }; /*---------------------------------------------------------------------------- * SMF_CheckFileType() *---------------------------------------------------------------------------- * 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: * *---------------------------------------------------------------------------- */ EAS_RESULT SMF_CheckFileType (S_EAS_DATA *pEASData, EAS_FILE_HANDLE fileHandle, EAS_VOID_PTR *ppHandle, EAS_I32 offset) { S_SMF_DATA* pSMFData; EAS_RESULT result; /* seek to starting offset - usually 0 */ *ppHandle = NULL; if ((result = EAS_HWFileSeek(pEASData->hwInstData, fileHandle, offset)) != EAS_SUCCESS) return result; /* search through file for header - slow method */ if (pEASData->searchHeaderFlag) { result = EAS_SearchFile(pEASData, fileHandle, smfHeader, sizeof(smfHeader), &offset); if (result != EAS_SUCCESS) return (result == EAS_EOF) ? EAS_SUCCESS : result; } /* read the first 4 bytes of the file - quick method */ else { EAS_U8 header[4]; EAS_I32 count; if ((result = EAS_HWReadFile(pEASData->hwInstData, fileHandle, header, sizeof(header), &count)) != EAS_SUCCESS) return result; /* check for 'MTrk' - return if no match */ if ((header[0] != 'M') || (header[1] != 'T') || (header[2] != 'h') || (header[3] != 'd')) return EAS_SUCCESS; } /* check for static memory allocation */ if (pEASData->staticMemoryModel) pSMFData = EAS_CMEnumData(EAS_CM_SMF_DATA); else { pSMFData = EAS_HWMalloc(pEASData->hwInstData, sizeof(S_SMF_DATA)); EAS_HWMemSet((void *)pSMFData,0, sizeof(S_SMF_DATA)); } if (!pSMFData) return EAS_ERROR_MALLOC_FAILED; /* initialize some critical data */ pSMFData->fileHandle = fileHandle; pSMFData->fileOffset = offset; pSMFData->pSynth = NULL; pSMFData->time = 0; pSMFData->state = EAS_STATE_OPEN; *ppHandle = pSMFData; return EAS_SUCCESS; } /*---------------------------------------------------------------------------- * SMF_Prepare() *---------------------------------------------------------------------------- * Purpose: * Prepare to parse the file. Allocates instance data (or uses static allocation for * static memory model). * * Inputs: * pEASData - pointer to overall EAS data structure * handle - pointer to file handle * * Outputs: * * * Side Effects: * *---------------------------------------------------------------------------- */ EAS_RESULT SMF_Prepare (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData) { S_SMF_DATA* pSMFData; EAS_RESULT result; /* check for valid state */ pSMFData = (S_SMF_DATA *) pInstData; if (pSMFData->state != EAS_STATE_OPEN) return EAS_ERROR_NOT_VALID_IN_THIS_STATE; /* instantiate a synthesizer */ if ((result = VMInitMIDI(pEASData, &pSMFData->pSynth)) != EAS_SUCCESS) { { /* dpp: EAS_ReportEx(_EAS_SEVERITY_ERROR, "VMInitMIDI returned %d\n", result); */ } return result; } /* parse the file header and setup the individual stream parsers */ if ((result = SMF_ParseHeader(pEASData->hwInstData, pSMFData)) != EAS_SUCCESS) return result; /* ready to play */ pSMFData->state = EAS_STATE_READY; return EAS_SUCCESS; } /*---------------------------------------------------------------------------- * SMF_Time() *---------------------------------------------------------------------------- * Purpose: * Returns the time of the next event in msecs * * Inputs: * pEASData - pointer to overall EAS data structure * handle - pointer to file handle * pTime - pointer to variable to hold time of next event (in msecs) * * Outputs: * * * Side Effects: * *---------------------------------------------------------------------------- */ /*lint -esym(715, pEASData) reserved for future use */ EAS_RESULT SMF_Time (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData, EAS_U32 *pTime) { S_SMF_DATA *pSMFData; pSMFData = (S_SMF_DATA*) pInstData; /* sanity check */ #ifdef _CHECKED_BUILD if (pSMFData->state == EAS_STATE_STOPPED) { { /* dpp: EAS_ReportEx(_EAS_SEVERITY_ERROR, "Can't ask for time on a stopped stream\n"); */ } } if (pSMFData->nextStream == NULL) { { /* dpp: EAS_ReportEx( _EAS_SEVERITY_ERROR, "no is NULL\n"); */ } } #endif #if 0 /* return time in milliseconds */ /* if chase mode, lie about time */ if (pSMFData->flags & SMF_FLAGS_CHASE_MODE) *pTime = 0; else #endif /*lint -e{704} use shift instead of division */ *pTime = pSMFData->time >> 8; *pTime = pSMFData->time >> 8; return EAS_SUCCESS; } /*---------------------------------------------------------------------------- * SMF_Event() *---------------------------------------------------------------------------- * Purpose: * Parse the next event in the file * * Inputs: * pEASData - pointer to overall EAS data structure * handle - pointer to file handle * * Outputs: * * * Side Effects: * *---------------------------------------------------------------------------- */ EAS_RESULT SMF_Event (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData, EAS_INT parserMode) { S_SMF_DATA* pSMFData; EAS_RESULT result; EAS_I32 i; EAS_U32 ticks; EAS_U32 temp; /* establish pointer to instance data */ pSMFData = (S_SMF_DATA*) pInstData; if (pSMFData->state >= EAS_STATE_OPEN) return EAS_SUCCESS; /* get current ticks */ ticks = pSMFData->nextStream->ticks; /* assume that an error occurred */ pSMFData->state = EAS_STATE_ERROR; #ifdef JET_INTERFACE /* if JET has track muted, set parser mode to mute */ if (pSMFData->nextStream->midiStream.jetData & MIDI_FLAGS_JET_MUTE) parserMode = eParserModeMute; #endif /* parse the next event from all the streams */ if ((result = SMF_ParseEvent(pEASData, pSMFData, pSMFData->nextStream, parserMode)) != EAS_SUCCESS) { /* check for unexpected end-of-file */ if (result != EAS_EOF) return result; /* indicate end of track for this stream */ pSMFData->nextStream->ticks = SMF_END_OF_TRACK; } /* get next delta time, unless already at end of track */ else if (pSMFData->nextStream->ticks != SMF_END_OF_TRACK) { if ((result = SMF_GetDeltaTime(pEASData->hwInstData, pSMFData->nextStream)) != EAS_SUCCESS) { /* check for unexpected end-of-file */ if (result != EAS_EOF) return result; /* indicate end of track for this stream */ pSMFData->nextStream->ticks = SMF_END_OF_TRACK; } /* if zero delta to next event, stay with this stream */ else if (pSMFData->nextStream->ticks == ticks) { pSMFData->state = EAS_STATE_PLAY; return EAS_SUCCESS; } } /* find next event in all streams */ temp = 0x7ffffff; pSMFData->nextStream = NULL; for (i = 0; i < pSMFData->numStreams; i++) { if (pSMFData->streams[i].ticks < temp) { temp = pSMFData->streams[i].ticks; pSMFData->nextStream = &pSMFData->streams[i]; } } /* are there any more events to parse? */ if (pSMFData->nextStream) { pSMFData->state = EAS_STATE_PLAY; /* update the time of the next event */ SMF_UpdateTime(pSMFData, pSMFData->nextStream->ticks - ticks); } else { pSMFData->state = EAS_STATE_STOPPING; VMReleaseAllVoices(pEASData->pVoiceMgr, pSMFData->pSynth); } return EAS_SUCCESS; } /*---------------------------------------------------------------------------- * SMF_State() *---------------------------------------------------------------------------- * 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: * *---------------------------------------------------------------------------- */ /*lint -esym(715, pEASData) reserved for future use */ EAS_RESULT SMF_State (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData, EAS_I32 *pState) { S_SMF_DATA* pSMFData; /* establish pointer to instance data */ pSMFData = (S_SMF_DATA*) pInstData; /* if stopping, check to see if synth voices are active */ if (pSMFData->state == EAS_STATE_STOPPING) { if (VMActiveVoices(pSMFData->pSynth) == 0) pSMFData->state = EAS_STATE_STOPPED; } if (pSMFData->state == EAS_STATE_PAUSING) { if (VMActiveVoices(pSMFData->pSynth) == 0) pSMFData->state = EAS_STATE_PAUSED; } /* return current state */ *pState = pSMFData->state; return EAS_SUCCESS; } /*---------------------------------------------------------------------------- * SMF_Close() *---------------------------------------------------------------------------- * Purpose: * Close the file and clean up * * Inputs: * pEASData - pointer to overall EAS data structure * handle - pointer to file handle * * Outputs: * * * Side Effects: * *---------------------------------------------------------------------------- */ EAS_RESULT SMF_Close (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData) { S_SMF_DATA* pSMFData; EAS_I32 i; EAS_RESULT result; pSMFData = (S_SMF_DATA*) pInstData; /* close all the streams */ for (i = 0; i < pSMFData->numStreams; i++) { if (pSMFData->streams[i].fileHandle != NULL) { if ((result = EAS_HWCloseFile(pEASData->hwInstData, pSMFData->streams[i].fileHandle)) != EAS_SUCCESS) return result; } } if (pSMFData->fileHandle != NULL) if ((result = EAS_HWCloseFile(pEASData->hwInstData, pSMFData->fileHandle)) != EAS_SUCCESS) return result; /* free the synth */ if (pSMFData->pSynth != NULL) VMMIDIShutdown(pEASData, pSMFData->pSynth); /* if using dynamic memory, free it */ if (!pEASData->staticMemoryModel) { if (pSMFData->streams) EAS_HWFree(pEASData->hwInstData, pSMFData->streams); /* free the instance data */ EAS_HWFree(pEASData->hwInstData, pSMFData); } return EAS_SUCCESS; } /*---------------------------------------------------------------------------- * SMF_Reset() *---------------------------------------------------------------------------- * 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: * *---------------------------------------------------------------------------- */ EAS_RESULT SMF_Reset (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData) { S_SMF_DATA* pSMFData; EAS_I32 i; EAS_RESULT result; EAS_U32 ticks; pSMFData = (S_SMF_DATA*) pInstData; /* reset time to zero */ pSMFData->time = 0; /* reset the synth */ VMReset(pEASData->pVoiceMgr, pSMFData->pSynth, EAS_TRUE); /* find the start of each track */ ticks = 0x7fffffffL; pSMFData->nextStream = NULL; for (i = 0; i < pSMFData->numStreams; i++) { /* reset file position to first byte of data in track */ if ((result = EAS_HWFileSeek(pEASData->hwInstData, pSMFData->streams[i].fileHandle, pSMFData->streams[i].startFilePos)) != EAS_SUCCESS) return result; /* initalize some data */ pSMFData->streams[i].ticks = 0; /* initalize the MIDI parser data */ EAS_InitMIDIStream(&pSMFData->streams[i].midiStream); /* parse the first delta time in each stream */ if ((result = SMF_GetDeltaTime(pEASData->hwInstData,&pSMFData->streams[i])) != EAS_SUCCESS) return result; if (pSMFData->streams[i].ticks < ticks) { ticks = pSMFData->streams[i].ticks; pSMFData->nextStream = &pSMFData->streams[i]; } } pSMFData->state = EAS_STATE_READY; return EAS_SUCCESS; } /*---------------------------------------------------------------------------- * SMF_Pause() *---------------------------------------------------------------------------- * Purpose: * Pauses the sequencer. Mutes all voices and sets state to pause. * * Inputs: * pEASData - pointer to overall EAS data structure * handle - pointer to file handle * * Outputs: * * * Side Effects: * *---------------------------------------------------------------------------- */ EAS_RESULT SMF_Pause (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData) { S_SMF_DATA *pSMFData; /* can't pause a stopped stream */ pSMFData = (S_SMF_DATA*) pInstData; if (pSMFData->state == EAS_STATE_STOPPED) return EAS_ERROR_ALREADY_STOPPED; /* mute the synthesizer */ VMMuteAllVoices(pEASData->pVoiceMgr, pSMFData->pSynth); pSMFData->state = EAS_STATE_PAUSING; return EAS_SUCCESS; } /*---------------------------------------------------------------------------- * SMF_Resume() *---------------------------------------------------------------------------- * Purpose: * Resume playing after a pause, sets state back to playing. * * Inputs: * pEASData - pointer to overall EAS data structure * handle - pointer to file handle * * Outputs: * * * Side Effects: * *---------------------------------------------------------------------------- */ /*lint -esym(715, pEASData) reserved for future use */ EAS_RESULT SMF_Resume (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData) { S_SMF_DATA *pSMFData; /* can't resume a stopped stream */ pSMFData = (S_SMF_DATA*) pInstData; if (pSMFData->state == EAS_STATE_STOPPED) return EAS_ERROR_ALREADY_STOPPED; /* nothing to do but resume playback */ pSMFData->state = EAS_STATE_PLAY; return EAS_SUCCESS; } /*---------------------------------------------------------------------------- * SMF_SetData() *---------------------------------------------------------------------------- * Purpose: * Sets parser parameters * * Inputs: * pEASData - pointer to overall EAS data structure * handle - pointer to file handle * * Outputs: * * * Side Effects: * *---------------------------------------------------------------------------- */ /*lint -esym(715, pEASData) reserved for future use */ EAS_RESULT SMF_SetData (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData, EAS_I32 param, EAS_I32 value) { S_SMF_DATA *pSMFData; pSMFData = (S_SMF_DATA*) pInstData; switch (param) { /* set metadata callback */ case PARSER_DATA_METADATA_CB: EAS_HWMemCpy(&pSMFData->metadata, (void*) value, sizeof(S_METADATA_CB)); break; #ifdef JET_INTERFACE /* set jet segment and track ID of all tracks for callback function */ case PARSER_DATA_JET_CB: { EAS_U32 i; EAS_U32 bit = (EAS_U32) value; bit = (bit << JET_EVENT_SEG_SHIFT) & JET_EVENT_SEG_MASK; for (i = 0; i < pSMFData->numStreams; i++) pSMFData->streams[i].midiStream.jetData = (pSMFData->streams[i].midiStream.jetData & ~(JET_EVENT_TRACK_MASK | JET_EVENT_SEG_MASK)) | i << JET_EVENT_TRACK_SHIFT | bit | MIDI_FLAGS_JET_CB; pSMFData->flags |= SMF_FLAGS_JET_STREAM; } break; /* set state of all mute flags at once */ case PARSER_DATA_MUTE_FLAGS: { EAS_INT i; EAS_U32 bit = (EAS_U32) value; for (i = 0; i < pSMFData->numStreams; i++) { if (bit & 1) pSMFData->streams[i].midiStream.jetData |= MIDI_FLAGS_JET_MUTE; else pSMFData->streams[i].midiStream.jetData &= ~MIDI_FLAGS_JET_MUTE; bit >>= 1; } } break; /* set track mute */ case PARSER_DATA_SET_MUTE: if (value < pSMFData->numStreams) pSMFData->streams[value].midiStream.jetData |= MIDI_FLAGS_JET_MUTE; else return EAS_ERROR_PARAMETER_RANGE; break; /* clear track mute */ case PARSER_DATA_CLEAR_MUTE: if (value < pSMFData->numStreams) pSMFData->streams[value].midiStream.jetData &= ~MIDI_FLAGS_JET_MUTE; else return EAS_ERROR_PARAMETER_RANGE; break; #endif default: return EAS_ERROR_INVALID_PARAMETER; } return EAS_SUCCESS; } /*---------------------------------------------------------------------------- * SMF_GetData() *---------------------------------------------------------------------------- * Purpose: * Retrieves parser parameters * * Inputs: * pEASData - pointer to overall EAS data structure * handle - pointer to file handle * * Outputs: * * * Side Effects: * *---------------------------------------------------------------------------- */ /*lint -esym(715, pEASData) reserved for future use */ EAS_RESULT SMF_GetData (S_EAS_DATA *pEASData, EAS_VOID_PTR pInstData, EAS_I32 param, EAS_I32 *pValue) { S_SMF_DATA *pSMFData; pSMFData = (S_SMF_DATA*) pInstData; switch (param) { /* return file type */ case PARSER_DATA_FILE_TYPE: if (pSMFData->numStreams == 1) *pValue = EAS_FILE_SMF0; else *pValue = EAS_FILE_SMF1; break; /* now handled in eas_public.c */ #if 0 case PARSER_DATA_POLYPHONY: if (pSMFData->pSynth) VMGetPolyphony(pEASData->pVoiceMgr, pSMFData->pSynth, pValue); else return EAS_ERROR_NOT_VALID_IN_THIS_STATE; break; case PARSER_DATA_PRIORITY: if (pSMFData->pSynth) VMGetPriority(pEASData->pVoiceMgr, pSMFData->pSynth, pValue); break; /* set transposition */ case PARSER_DATA_TRANSPOSITION: *pValue = pSMFData->transposition; break; #endif case PARSER_DATA_SYNTH_HANDLE: *pValue = (EAS_I32) pSMFData->pSynth; break; default: return EAS_ERROR_INVALID_PARAMETER; } return EAS_SUCCESS; } /*---------------------------------------------------------------------------- * SMF_GetVarLenData() *---------------------------------------------------------------------------- * Purpose: * Reads a varible length quantity from an SMF file * * Inputs: * * * Outputs: * * * Side Effects: * *---------------------------------------------------------------------------- */ static EAS_RESULT SMF_GetVarLenData (EAS_HW_DATA_HANDLE hwInstData, EAS_FILE_HANDLE fileHandle, EAS_U32 *pData) { EAS_RESULT result; EAS_U32 data; EAS_U8 c; /* read until bit 7 is zero */ data = 0; do { if ((result = EAS_HWGetByte(hwInstData, fileHandle,&c)) != EAS_SUCCESS) return result; data = (data << 7) | (c & 0x7f); } while (c & 0x80); *pData = data; return EAS_SUCCESS; } /*---------------------------------------------------------------------------- * SMF_GetDeltaTime() *---------------------------------------------------------------------------- * Purpose: * Reads a varible length quantity from an SMF file * * Inputs: * * * Outputs: * * * Side Effects: * *---------------------------------------------------------------------------- */ static EAS_RESULT SMF_GetDeltaTime (EAS_HW_DATA_HANDLE hwInstData, S_SMF_STREAM *pSMFStream) { EAS_RESULT result; EAS_U32 ticks; if ((result = SMF_GetVarLenData(hwInstData, pSMFStream->fileHandle, &ticks)) != EAS_SUCCESS) return result; pSMFStream->ticks += ticks; return EAS_SUCCESS; } /*---------------------------------------------------------------------------- * SMF_ParseMetaEvent() *---------------------------------------------------------------------------- * Purpose: * Reads a varible length quantity from an SMF file * * Inputs: * * * Outputs: * * * Side Effects: * *---------------------------------------------------------------------------- */ static EAS_RESULT SMF_ParseMetaEvent (S_EAS_DATA *pEASData, S_SMF_DATA *pSMFData, S_SMF_STREAM *pSMFStream) { EAS_RESULT result; EAS_U32 len; EAS_I32 pos; EAS_U32 temp; EAS_U8 c; /* get the meta-event type */ if ((result = EAS_HWGetByte(pEASData->hwInstData, pSMFStream->fileHandle, &c)) != EAS_SUCCESS) return result; /* get the length */ if ((result = SMF_GetVarLenData(pEASData->hwInstData, pSMFStream->fileHandle, &len)) != EAS_SUCCESS) return result; /* get the current file position so we can skip the event */ if ((result = EAS_HWFilePos(pEASData->hwInstData, pSMFStream->fileHandle, &pos)) != EAS_SUCCESS) return result; pos += (EAS_I32) len; /* end of track? */ if (c == SMF_META_END_OF_TRACK) { { /* dpp: EAS_ReportEx(_EAS_SEVERITY_DETAIL, "Meta-event: end of track\n", c, len); */ } pSMFStream->ticks = SMF_END_OF_TRACK; } /* tempo event? */ else if (c == SMF_META_TEMPO) { /* read the 3-byte timebase value */ temp = 0; while (len--) { if ((result = EAS_HWGetByte(pEASData->hwInstData, pSMFStream->fileHandle, &c)) != EAS_SUCCESS) return result; temp = (temp << 8) | c; } pSMFData->tickConv = (EAS_U16) (((temp * 1024) / pSMFData->ppqn + 500) / 1000); pSMFData->flags |= SMF_FLAGS_HAS_TEMPO; } /* check for time signature - see iMelody spec V1.4 section 4.1.2.2.3.6 */ else if (c == SMF_META_TIME_SIGNATURE) { pSMFData->flags |= SMF_FLAGS_HAS_TIME_SIG; } /* if the host has registered a metadata callback return the metadata */ else if (pSMFData->metadata.callback) { EAS_I32 readLen; E_EAS_METADATA_TYPE metaType; metaType = EAS_METADATA_UNKNOWN; /* only process title on the first track */ if (c == SMF_META_SEQTRK_NAME) metaType = EAS_METADATA_TITLE; else if (c == SMF_META_TEXT) metaType = EAS_METADATA_TEXT; else if (c == SMF_META_COPYRIGHT) metaType = EAS_METADATA_COPYRIGHT; else if (c == SMF_META_LYRIC) metaType = EAS_METADATA_LYRIC; if (metaType != EAS_METADATA_UNKNOWN) { readLen = pSMFData->metadata.bufferSize - 1; if ((EAS_I32) len < readLen) readLen = (EAS_I32) len; if ((result = EAS_HWReadFile(pEASData->hwInstData, pSMFStream->fileHandle, pSMFData->metadata.buffer, readLen, &readLen)) != EAS_SUCCESS) return result; pSMFData->metadata.buffer[readLen] = 0; pSMFData->metadata.callback(metaType, pSMFData->metadata.buffer, pSMFData->metadata.pUserData); } } /* position file to next event - in case we ignored all or part of the meta-event */ if ((result = EAS_HWFileSeek(pEASData->hwInstData, pSMFStream->fileHandle, pos)) != EAS_SUCCESS) return result; { /* dpp: EAS_ReportEx(_EAS_SEVERITY_DETAIL, "Meta-event: type=%02x, len=%d\n", c, len); */ } return EAS_SUCCESS; } /*---------------------------------------------------------------------------- * SMF_ParseSysEx() *---------------------------------------------------------------------------- * Purpose: * Reads a varible length quantity from an SMF file * * Inputs: * * * Outputs: * * * Side Effects: * *---------------------------------------------------------------------------- */ static EAS_RESULT SMF_ParseSysEx (S_EAS_DATA *pEASData, S_SMF_DATA *pSMFData, S_SMF_STREAM *pSMFStream, EAS_U8 f0, EAS_INT parserMode) { EAS_RESULT result; EAS_U32 len; EAS_U8 c; /* get the length */ if ((result = SMF_GetVarLenData(pEASData->hwInstData, pSMFStream->fileHandle, &len)) != EAS_SUCCESS) return result; /* start of SysEx message? */ if (f0 == 0xf0) { if ((result = EAS_ParseMIDIStream(pEASData, pSMFData->pSynth, &pSMFStream->midiStream, f0, parserMode)) != EAS_SUCCESS) return result; } /* feed the SysEx to the stream parser */ while (len--) { if ((result = EAS_HWGetByte(pEASData->hwInstData, pSMFStream->fileHandle, &c)) != EAS_SUCCESS) return result; if ((result = EAS_ParseMIDIStream(pEASData, pSMFData->pSynth, &pSMFStream->midiStream, c, parserMode)) != EAS_SUCCESS) return result; /* check for GM system ON */ if (pSMFStream->midiStream.flags & MIDI_FLAG_GM_ON) pSMFData->flags |= SMF_FLAGS_HAS_GM_ON; } return EAS_SUCCESS; } /*---------------------------------------------------------------------------- * SMF_ParseEvent() *---------------------------------------------------------------------------- * Purpose: * Reads a varible length quantity from an SMF file * * Inputs: * * * Outputs: * * * Side Effects: * *---------------------------------------------------------------------------- */ static EAS_RESULT SMF_ParseEvent (S_EAS_DATA *pEASData, S_SMF_DATA *pSMFData, S_SMF_STREAM *pSMFStream, EAS_INT parserMode) { EAS_RESULT result; EAS_U8 c; /* get the event type */ if ((result = EAS_HWGetByte(pEASData->hwInstData, pSMFStream->fileHandle, &c)) != EAS_SUCCESS) return result; /* parse meta-event */ if (c == 0xff) { if ((result = SMF_ParseMetaEvent(pEASData, pSMFData, pSMFStream)) != EAS_SUCCESS) return result; } /* parse SysEx */ else if ((c == 0xf0) || (c == 0xf7)) { if ((result = SMF_ParseSysEx(pEASData, pSMFData, pSMFStream, c, parserMode)) != EAS_SUCCESS) return result; } /* parse MIDI message */ else { if ((result = EAS_ParseMIDIStream(pEASData, pSMFData->pSynth, &pSMFStream->midiStream, c, parserMode)) != EAS_SUCCESS) return result; /* keep streaming data to the MIDI parser until the message is complete */ while (pSMFStream->midiStream.pending) { if ((result = EAS_HWGetByte(pEASData->hwInstData, pSMFStream->fileHandle, &c)) != EAS_SUCCESS) return result; if ((result = EAS_ParseMIDIStream(pEASData, pSMFData->pSynth, &pSMFStream->midiStream, c, parserMode)) != EAS_SUCCESS) return result; } } /* chase mode logic */ if (pSMFData->time == 0) { if (pSMFData->flags & SMF_FLAGS_CHASE_MODE) { if (pSMFStream->midiStream.flags & MIDI_FLAG_FIRST_NOTE) pSMFData->flags &= ~SMF_FLAGS_CHASE_MODE; } else if ((pSMFData->flags & SMF_FLAGS_SETUP_BAR) == SMF_FLAGS_SETUP_BAR) pSMFData->flags = (pSMFData->flags & ~SMF_FLAGS_SETUP_BAR) | SMF_FLAGS_CHASE_MODE; } return EAS_SUCCESS; } /*---------------------------------------------------------------------------- * SMF_ParseHeader() *---------------------------------------------------------------------------- * Purpose: * Parses the header of an SMF file, allocates memory the stream parsers and initializes the * stream parsers. * * Inputs: * pEASData - pointer to overall EAS data structure * pSMFData - pointer to parser instance data * fileHandle - file handle * fileOffset - offset in the file where the header data starts, usually 0 * * * Outputs: * * * Side Effects: * *---------------------------------------------------------------------------- */ /*lint -e{801} we know that 'goto' is deprecated - but it's cleaner in this case */ EAS_RESULT SMF_ParseHeader (EAS_HW_DATA_HANDLE hwInstData, S_SMF_DATA *pSMFData) { EAS_RESULT result; EAS_I32 i; EAS_U16 division; EAS_U32 chunkSize; EAS_U32 chunkStart; EAS_U32 temp; EAS_U32 ticks; /* rewind the file and find the end of the header chunk */ if ((result = EAS_HWFileSeek(hwInstData, pSMFData->fileHandle, pSMFData->fileOffset + SMF_OFS_HEADER_SIZE)) != EAS_SUCCESS) goto ReadError; if ((result = EAS_HWGetDWord(hwInstData, pSMFData->fileHandle, &chunkSize, EAS_TRUE)) != EAS_SUCCESS) goto ReadError; /* determine the number of tracks */ if ((result = EAS_HWFileSeek(hwInstData, pSMFData->fileHandle, pSMFData->fileOffset + SMF_OFS_NUM_TRACKS)) != EAS_SUCCESS) goto ReadError; if ((result = EAS_HWGetWord(hwInstData, pSMFData->fileHandle, &pSMFData->numStreams, EAS_TRUE)) != EAS_SUCCESS) goto ReadError; /* limit the number of tracks */ if (pSMFData->numStreams > MAX_SMF_STREAMS) { { /* dpp: EAS_ReportEx(_EAS_SEVERITY_WARNING, "SMF file contains %u tracks, playing %d tracks\n", pSMFData->numStreams, MAX_SMF_STREAMS); */ } pSMFData->numStreams = MAX_SMF_STREAMS; } /* get the time division */ if ((result = EAS_HWGetWord(hwInstData, pSMFData->fileHandle, &division, EAS_TRUE)) != EAS_SUCCESS) goto ReadError; /* setup default timebase for 120 bpm */ pSMFData->ppqn = 192; if (division & 0x8000) { /* dpp: EAS_ReportEx(_EAS_SEVERITY_WARNING,"No support for SMPTE code timebase\n"); */ } else pSMFData->ppqn = (division & 0x7fff); pSMFData->tickConv = (EAS_U16) (((SMF_DEFAULT_TIMEBASE * 1024) / pSMFData->ppqn + 500) / 1000); /* dynamic memory allocation, allocate memory for streams */ if (pSMFData->streams == NULL) { pSMFData->streams = EAS_HWMalloc(hwInstData,sizeof(S_SMF_STREAM) * pSMFData->numStreams); if (pSMFData->streams == NULL) return EAS_ERROR_MALLOC_FAILED; /* zero the memory to insure complete initialization */ EAS_HWMemSet((void *)(pSMFData->streams), 0, sizeof(S_SMF_STREAM) * pSMFData->numStreams); } /* find the start of each track */ chunkStart = (EAS_U32) pSMFData->fileOffset; ticks = 0x7fffffffL; pSMFData->nextStream = NULL; for (i = 0; i < pSMFData->numStreams; i++) { for (;;) { /* calculate start of next chunk - checking for errors */ temp = chunkStart + SMF_CHUNK_INFO_SIZE + chunkSize; if (temp <= chunkStart) { { /* dpp: EAS_ReportEx(_EAS_SEVERITY_WARNING,"Error in chunk size at offset %d\n", chunkStart); */ } return EAS_ERROR_FILE_FORMAT; } chunkStart = temp; /* seek to the start of the next chunk */ if ((result = EAS_HWFileSeek(hwInstData, pSMFData->fileHandle, (EAS_I32) chunkStart)) != EAS_SUCCESS) goto ReadError; /* read the chunk identifier */ if ((result = EAS_HWGetDWord(hwInstData, pSMFData->fileHandle, &temp, EAS_TRUE)) != EAS_SUCCESS) goto ReadError; /* read the chunk size */ if ((result = EAS_HWGetDWord(hwInstData, pSMFData->fileHandle, &chunkSize, EAS_TRUE)) != EAS_SUCCESS) goto ReadError; /* make sure this is an 'MTrk' chunk */ if (temp == SMF_CHUNK_TYPE_TRACK) break; { /* dpp: EAS_ReportEx(_EAS_SEVERITY_WARNING,"Unexpected chunk type: 0x%08x\n", temp); */ } } /* initalize some data */ pSMFData->streams[i].ticks = 0; pSMFData->streams[i].fileHandle = pSMFData->fileHandle; /* NULL the file handle so we don't try to close it twice */ pSMFData->fileHandle = NULL; /* save this file position as the start of the track */ pSMFData->streams[i].startFilePos = (EAS_I32) chunkStart + SMF_CHUNK_INFO_SIZE; /* initalize the MIDI parser data */ EAS_InitMIDIStream(&pSMFData->streams[i].midiStream); /* parse the first delta time in each stream */ if ((result = SMF_GetDeltaTime(hwInstData, &pSMFData->streams[i])) != EAS_SUCCESS) goto ReadError; if (pSMFData->streams[i].ticks < ticks) { ticks = pSMFData->streams[i].ticks; pSMFData->nextStream = &pSMFData->streams[i]; } /* more tracks to do, create a duplicate file handle */ if (i < (pSMFData->numStreams - 1)) { if ((result = EAS_HWDupHandle(hwInstData, pSMFData->streams[i].fileHandle, &pSMFData->fileHandle)) != EAS_SUCCESS) goto ReadError; } } /* update the time of the next event */ if (pSMFData->nextStream) SMF_UpdateTime(pSMFData, pSMFData->nextStream->ticks); return EAS_SUCCESS; /* ugly goto: but simpler than structured */ ReadError: if (result == EAS_EOF) return EAS_ERROR_FILE_FORMAT; return result; } /*---------------------------------------------------------------------------- * SMF_UpdateTime() *---------------------------------------------------------------------------- * Purpose: * Update the millisecond time base by converting the ticks into millieconds * * Inputs: * * * Outputs: * * * Side Effects: * *---------------------------------------------------------------------------- */ static void SMF_UpdateTime (S_SMF_DATA *pSMFData, EAS_U32 ticks) { EAS_U32 temp1, temp2; if (pSMFData->flags & SMF_FLAGS_CHASE_MODE) return; temp1 = (ticks >> 10) * pSMFData->tickConv; temp2 = (ticks & 0x3ff) * pSMFData->tickConv; pSMFData->time += (EAS_I32)((temp1 << 8) + (temp2 >> 2)); }