| /* ------------------------------------------------------------------ |
| * Copyright (C) 1998-2009 PacketVideo |
| * |
| * 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. |
| * ------------------------------------------------------------------- |
| */ |
| /* |
| ------------------------------------------------------------------------------ |
| |
| PacketVideo Corp. |
| MP3 Decoder Library |
| |
| Filename: pvmp3_framedecoder.cpp |
| |
| Functions: |
| pvmp3_framedecoder |
| pvmp3_InitDecoder |
| pvmp3_resetDecoder |
| |
| Date: 09/21/2007 |
| |
| ------------------------------------------------------------------------------ |
| REVISION HISTORY |
| |
| |
| Description: |
| |
| ------------------------------------------------------------------------------ |
| INPUT AND OUTPUT DEFINITIONS |
| |
| Input |
| pExt = pointer to the external interface structure. See the file |
| pvmp3decoder_api.h for a description of each field. |
| Data type of pointer to a tPVMP3DecoderExternal |
| structure. |
| |
| pMem = void pointer to hide the internal implementation of the library |
| It is cast back to a tmp3dec_file structure. This structure |
| contains information that needs to persist between calls to |
| this function, or is too big to be placed on the stack, even |
| though the data is only needed during execution of this function |
| Data type void pointer, internally pointer to a tmp3dec_file |
| structure. |
| |
| |
| Outputs: |
| status = ERROR condition. see structure ERROR_CODE |
| |
| Pointers and Buffers Modified: |
| pMem contents are modified. |
| pExt: (more detail in the file pvmp3decoder_api.h) |
| inputBufferUsedLength - number of array elements used up by the stream. |
| samplingRate - sampling rate in samples per sec |
| bitRate - bit rate in bits per second, varies frame to frame. |
| |
| |
| |
| ------------------------------------------------------------------------------ |
| FUNCTIONS DESCRIPTION |
| |
| pvmp3_framedecoder |
| frame decoder library driver |
| pvmp3_InitDecoder |
| Decoder Initialization |
| pvmp3_resetDecoder |
| Reset Decoder |
| |
| ------------------------------------------------------------------------------ |
| REQUIREMENTS |
| |
| |
| ------------------------------------------------------------------------------ |
| REFERENCES |
| |
| [1] ISO MPEG Audio Subgroup Software Simulation Group (1996) |
| ISO 13818-3 MPEG-2 Audio Decoder - Lower Sampling Frequency Extension |
| |
| ------------------------------------------------------------------------------ |
| PSEUDO-CODE |
| |
| ------------------------------------------------------------------------------ |
| */ |
| |
| |
| /*---------------------------------------------------------------------------- |
| ; INCLUDES |
| ----------------------------------------------------------------------------*/ |
| |
| |
| #include "pvmp3_framedecoder.h" |
| #include "pvmp3_dec_defs.h" |
| #include "pvmp3_poly_phase_synthesis.h" |
| #include "pvmp3_tables.h" |
| #include "pvmp3_imdct_synth.h" |
| #include "pvmp3_alias_reduction.h" |
| #include "pvmp3_reorder.h" |
| #include "pvmp3_dequantize_sample.h" |
| #include "pvmp3_stereo_proc.h" |
| #include "pvmp3_mpeg2_stereo_proc.h" |
| #include "pvmp3_get_side_info.h" |
| #include "pvmp3_get_scale_factors.h" |
| #include "pvmp3_mpeg2_get_scale_factors.h" |
| #include "pvmp3_decode_header.h" |
| #include "pvmp3_get_main_data_size.h" |
| #include "s_tmp3dec_file.h" |
| #include "pvmp3_getbits.h" |
| #include "mp3_mem_funcs.h" |
| |
| |
| /*---------------------------------------------------------------------------- |
| ; MACROS |
| ; Define module specific macros here |
| ----------------------------------------------------------------------------*/ |
| |
| |
| /*---------------------------------------------------------------------------- |
| ; DEFINES |
| ; Include all pre-processor statements here. Include conditional |
| ; compile variables also. |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; LOCAL FUNCTION DEFINITIONS |
| ; Function Prototype declaration |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; LOCAL STORE/BUFFER/POINTER DEFINITIONS |
| ; Variable declaration - defined here and used outside this module |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; EXTERNAL FUNCTION REFERENCES |
| ; Declare functions defined elsewhere and referenced in this module |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES |
| ; Declare variables used in this module but defined elsewhere |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; FUNCTION CODE |
| ----------------------------------------------------------------------------*/ |
| |
| ERROR_CODE pvmp3_framedecoder(tPVMP3DecoderExternal *pExt, |
| void *pMem) |
| { |
| |
| ERROR_CODE errorCode = NO_DECODING_ERROR; |
| |
| int32 crc_error_count = 0; |
| uint32 sent_crc = 0; |
| uint32 computed_crc = 0; |
| |
| tmp3dec_chan *pChVars[CHAN]; |
| tmp3dec_file *pVars = (tmp3dec_file *)pMem; |
| |
| mp3Header info_data; |
| mp3Header *info = &info_data; |
| |
| pVars->inputStream.pBuffer = pExt->pInputBuffer; |
| |
| |
| pVars->inputStream.usedBits = pExt->inputBufferUsedLength << 3; |
| pVars->inputStream.inputBufferCurrentLength = pExt->inputBufferCurrentLength; |
| |
| |
| errorCode = pvmp3_decode_header(&pVars->inputStream, |
| info, |
| &computed_crc); |
| |
| if (errorCode != NO_DECODING_ERROR) |
| { |
| pExt->outputFrameSize = 0; |
| return errorCode; |
| } |
| |
| pVars->num_channels = (info->mode == MPG_MD_MONO) ? 1 : 2; |
| pExt->num_channels = pVars->num_channels; |
| |
| int32 outputFrameSize = (info->version_x == MPEG_1) ? |
| 2 * SUBBANDS_NUMBER * FILTERBANK_BANDS : |
| SUBBANDS_NUMBER * FILTERBANK_BANDS; |
| |
| outputFrameSize = (info->mode == MPG_MD_MONO) ? outputFrameSize : outputFrameSize << 1; |
| |
| |
| /* |
| * Check if output buffer has enough room to hold output PCM |
| */ |
| if (pExt->outputFrameSize >= outputFrameSize) |
| { |
| pExt->outputFrameSize = outputFrameSize; |
| } |
| else |
| { |
| pExt->outputFrameSize = 0; |
| return OUTPUT_BUFFER_TOO_SMALL; |
| } |
| |
| |
| pChVars[ LEFT] = &pVars->perChan[ LEFT]; |
| pChVars[RIGHT] = &pVars->perChan[RIGHT]; |
| |
| |
| |
| |
| if (info->error_protection) |
| { |
| /* |
| * Get crc content |
| */ |
| sent_crc = getUpTo17bits(&pVars->inputStream, 16); |
| } |
| |
| |
| if (info->layer_description == 3) |
| { |
| int32 gr; |
| int32 ch; |
| uint32 main_data_end; |
| int32 bytes_to_discard; |
| int16 *ptrOutBuffer = pExt->pOutputBuffer; |
| |
| /* |
| * Side Information must be extracted from the bitstream and store for use |
| * during the decoded of the associated frame |
| */ |
| |
| errorCode = pvmp3_get_side_info(&pVars->inputStream, |
| &pVars->sideInfo, |
| info, |
| &computed_crc); |
| |
| if (errorCode != NO_DECODING_ERROR) |
| { |
| pExt->outputFrameSize = 0; |
| return errorCode; |
| } |
| |
| /* |
| * If CRC was sent, check that matches the one got while parsing data |
| * disable crc if this is the desired mode |
| */ |
| if (info->error_protection) |
| { |
| if ((computed_crc != sent_crc) && pExt->crcEnabled) |
| { |
| crc_error_count++; |
| } |
| } |
| |
| /* |
| * main data (scalefactors, Huffman coded, etc,) are not necessarily located |
| * adjacent to the side-info. Beginning of main data is located using |
| * field "main_data_begin" of the current frame. The length does not include |
| * header and side info. |
| * "main_data_begin" points to the first bit of main data of a frame. It is a negative |
| * offset in bytes from the first byte of the sync word |
| * main_data_begin = 0 <===> main data start rigth after side info. |
| */ |
| |
| int32 temp = pvmp3_get_main_data_size(info, pVars); |
| |
| |
| /* |
| * Check if available data holds a full frame, if not flag an error |
| */ |
| |
| if ((uint32)pVars->predicted_frame_size > pVars->inputStream.inputBufferCurrentLength) |
| { |
| pExt->outputFrameSize = 0; |
| return NO_ENOUGH_MAIN_DATA_ERROR; |
| } |
| |
| /* |
| * Fill in internal circular buffer |
| */ |
| fillMainDataBuf(pVars, temp); |
| |
| |
| main_data_end = pVars->mainDataStream.usedBits >> 3; /* in bytes */ |
| if ((main_data_end << 3) < pVars->mainDataStream.usedBits) |
| { |
| main_data_end++; |
| pVars->mainDataStream.usedBits = main_data_end << 3; |
| } |
| |
| |
| // force signed computation; buffer sizes and offsets are all going to be |
| // well within the constraints of 32-bit signed math. |
| bytes_to_discard = pVars->frame_start |
| - ((int32)pVars->sideInfo.main_data_begin) |
| - ((int32)main_data_end); |
| |
| |
| if (main_data_end > BUFSIZE) /* check overflow on the buffer */ |
| { |
| pVars->frame_start -= BUFSIZE; |
| |
| pVars->mainDataStream.usedBits -= (BUFSIZE << 3); |
| } |
| |
| pVars->frame_start += temp; |
| |
| |
| if (bytes_to_discard < 0 || crc_error_count) |
| { |
| /* |
| * Not enough data to decode, then we should avoid reading this |
| * data ( getting/ignoring sido info and scale data) |
| * Main data could be located in the previous frame, so an unaccounted |
| * frame can cause incorrect processing |
| * Just run the polyphase filter to "clean" the history buffer |
| */ |
| errorCode = NO_ENOUGH_MAIN_DATA_ERROR; |
| |
| /* |
| * Clear the input to these filters |
| */ |
| |
| pv_memset((void*)pChVars[RIGHT]->work_buf_int32, |
| 0, |
| SUBBANDS_NUMBER*FILTERBANK_BANDS*sizeof(pChVars[RIGHT]->work_buf_int32[0])); |
| |
| pv_memset((void*)pChVars[LEFT]->work_buf_int32, |
| 0, |
| SUBBANDS_NUMBER*FILTERBANK_BANDS*sizeof(pChVars[LEFT]->work_buf_int32[0])); |
| |
| /* clear circular buffers, to avoid any glitch */ |
| pv_memset((void*)&pChVars[ LEFT]->circ_buffer[576], |
| 0, |
| 480*sizeof(pChVars[ LEFT]->circ_buffer[0])); |
| pv_memset((void*)&pChVars[RIGHT]->circ_buffer[576], |
| 0, |
| 480*sizeof(pChVars[RIGHT]->circ_buffer[0])); |
| |
| pChVars[ LEFT]->used_freq_lines = 575; |
| pChVars[RIGHT]->used_freq_lines = 575; |
| |
| } |
| else |
| { |
| pVars->mainDataStream.usedBits += (bytes_to_discard << 3); |
| } |
| |
| /* |
| * if (fr_ps->header->version_x == MPEG_1), use 2 granules, otherwise just 1 |
| */ |
| for (gr = 0; gr < (1 + !(info->version_x)); gr++) |
| { |
| if (errorCode != NO_ENOUGH_MAIN_DATA_ERROR) |
| { |
| for (ch = 0; ch < pVars->num_channels; ch++) |
| { |
| int32 part2_start = pVars->mainDataStream.usedBits; |
| |
| if (info->version_x == MPEG_1) |
| { |
| |
| pvmp3_get_scale_factors(&pVars->scaleFactors[ch], |
| &pVars->sideInfo, |
| gr, |
| ch, |
| &pVars->mainDataStream); |
| } |
| else |
| { |
| int32 * tmp = pVars->Scratch_mem; |
| pvmp3_mpeg2_get_scale_factors(&pVars->scaleFactors[ch], |
| &pVars->sideInfo, |
| gr, |
| ch, |
| info, |
| (uint32 *)tmp, |
| &pVars->mainDataStream); |
| } |
| |
| pChVars[ch]->used_freq_lines = pvmp3_huffman_parsing(pChVars[ch]->work_buf_int32, |
| &pVars->sideInfo.ch[ch].gran[gr], |
| pVars, |
| part2_start, |
| info); |
| |
| |
| pvmp3_dequantize_sample(pChVars[ch]->work_buf_int32, |
| &pVars->scaleFactors[ch], |
| &pVars->sideInfo.ch[ch].gran[gr], |
| pChVars[ch]->used_freq_lines, |
| info); |
| |
| |
| |
| |
| } /* for (ch=0; ch<stereo; ch++) */ |
| |
| if (pVars->num_channels == 2) |
| { |
| |
| int32 used_freq_lines = (pChVars[ LEFT]->used_freq_lines > |
| pChVars[RIGHT]->used_freq_lines) ? |
| pChVars[ LEFT]->used_freq_lines : |
| pChVars[RIGHT]->used_freq_lines; |
| |
| pChVars[ LEFT]->used_freq_lines = used_freq_lines; |
| pChVars[RIGHT]->used_freq_lines = used_freq_lines; |
| |
| if (info->version_x == MPEG_1) |
| { |
| pvmp3_stereo_proc(pChVars[ LEFT]->work_buf_int32, |
| pChVars[RIGHT]->work_buf_int32, |
| &pVars->scaleFactors[RIGHT], |
| &pVars->sideInfo.ch[LEFT].gran[gr], |
| used_freq_lines, |
| info); |
| } |
| else |
| { |
| int32 * tmp = pVars->Scratch_mem; |
| pvmp3_mpeg2_stereo_proc(pChVars[ LEFT]->work_buf_int32, |
| pChVars[RIGHT]->work_buf_int32, |
| &pVars->scaleFactors[RIGHT], |
| &pVars->sideInfo.ch[ LEFT].gran[gr], |
| &pVars->sideInfo.ch[RIGHT].gran[gr], |
| (uint32 *)tmp, |
| used_freq_lines, |
| info); |
| } |
| } |
| |
| } /* if ( errorCode != NO_ENOUGH_MAIN_DATA_ERROR) */ |
| |
| for (ch = 0; ch < pVars->num_channels; ch++) |
| { |
| |
| pvmp3_reorder(pChVars[ch]->work_buf_int32, |
| &pVars->sideInfo.ch[ch].gran[gr], |
| &pChVars[ ch]->used_freq_lines, |
| info, |
| pVars->Scratch_mem); |
| |
| pvmp3_alias_reduction(pChVars[ch]->work_buf_int32, |
| &pVars->sideInfo.ch[ch].gran[gr], |
| &pChVars[ ch]->used_freq_lines, |
| info); |
| |
| |
| /* |
| * IMDCT |
| */ |
| /* set mxposition |
| * In case of mixed blocks, # of bands with long |
| * blocks (2 or 4) else 0 |
| */ |
| uint16 mixedBlocksLongBlocks = 0; /* 0 = long or short, 2=mixed, 4=mixed 2.5@8000 */ |
| if (pVars->sideInfo.ch[ch].gran[gr].mixed_block_flag && |
| pVars->sideInfo.ch[ch].gran[gr].window_switching_flag) |
| { |
| if ((info->version_x == MPEG_2_5) && (info->sampling_frequency == 2)) |
| { |
| mixedBlocksLongBlocks = 4; /* mpeg2.5 @ 8 KHz */ |
| } |
| else |
| { |
| mixedBlocksLongBlocks = 2; |
| } |
| } |
| |
| pvmp3_imdct_synth(pChVars[ch]->work_buf_int32, |
| pChVars[ch]->overlap, |
| pVars->sideInfo.ch[ch].gran[gr].block_type, |
| mixedBlocksLongBlocks, |
| pChVars[ ch]->used_freq_lines, |
| pVars->Scratch_mem); |
| |
| |
| /* |
| * Polyphase synthesis |
| */ |
| |
| pvmp3_poly_phase_synthesis(pChVars[ch], |
| pVars->num_channels, |
| pExt->equalizerType, |
| &ptrOutBuffer[ch]); |
| |
| |
| }/* end ch loop */ |
| |
| ptrOutBuffer += pVars->num_channels * SUBBANDS_NUMBER * FILTERBANK_BANDS; |
| } /* for (gr=0;gr<Max_gr;gr++) */ |
| |
| /* skip ancillary data */ |
| if (info->bitrate_index > 0) |
| { /* if not free-format */ |
| |
| int32 ancillary_data_lenght = pVars->predicted_frame_size << 3; |
| |
| ancillary_data_lenght -= pVars->inputStream.usedBits; |
| |
| /* skip ancillary data */ |
| if (ancillary_data_lenght > 0) |
| { |
| pVars->inputStream.usedBits += ancillary_data_lenght; |
| } |
| |
| } |
| |
| /* |
| * This overrides a possible NO_ENOUGH_MAIN_DATA_ERROR |
| */ |
| errorCode = NO_DECODING_ERROR; |
| |
| } |
| else |
| { |
| /* |
| * The info on the header leads to an unsupported layer, more data |
| * will not fix this, so this is a bad frame, |
| */ |
| |
| pExt->outputFrameSize = 0; |
| return UNSUPPORTED_LAYER; |
| } |
| |
| pExt->inputBufferUsedLength = pVars->inputStream.usedBits >> 3; |
| pExt->totalNumberOfBitsUsed += pVars->inputStream.usedBits; |
| pExt->version = info->version_x; |
| pExt->samplingRate = mp3_s_freq[info->version_x][info->sampling_frequency]; |
| pExt->bitRate = mp3_bitrate[pExt->version][info->bitrate_index]; |
| |
| |
| /* |
| * Always verify buffer overrun condition |
| */ |
| |
| if (pExt->inputBufferUsedLength > pExt->inputBufferCurrentLength) |
| { |
| pExt->outputFrameSize = 0; |
| errorCode = NO_ENOUGH_MAIN_DATA_ERROR; |
| } |
| |
| return errorCode; |
| |
| } |
| |
| |
| /*---------------------------------------------------------------------------- |
| ; FUNCTION CODE |
| ----------------------------------------------------------------------------*/ |
| |
| __inline void fillDataBuf(tmp3Bits *pMainData, |
| uint32 val) /* val to write into the buffer */ |
| { |
| pMainData->pBuffer[module(pMainData->offset++, BUFSIZE)] = (uint8)val; |
| } |
| |
| |
| void fillMainDataBuf(void *pMem, int32 temp) |
| { |
| tmp3dec_file *pVars = (tmp3dec_file *)pMem; |
| |
| |
| int32 offset = (pVars->inputStream.usedBits) >> INBUF_ARRAY_INDEX_SHIFT; |
| |
| /* |
| * Check if input circular buffer boundaries need to be enforced |
| */ |
| if ((offset + temp) < BUFSIZE) |
| { |
| uint8 * ptr = pVars->inputStream.pBuffer + offset; |
| |
| offset = pVars->mainDataStream.offset; |
| |
| /* |
| * Check if main data circular buffer boundaries need to be enforced |
| */ |
| if ((offset + temp) < BUFSIZE) |
| { |
| pv_memcpy((pVars->mainDataStream.pBuffer + offset), ptr, temp*sizeof(uint8)); |
| pVars->mainDataStream.offset += temp; |
| } |
| else |
| { |
| int32 tmp1 = *(ptr++); |
| for (int32 nBytes = temp >> 1; nBytes != 0; nBytes--) /* read main data. */ |
| { |
| int32 tmp2 = *(ptr++); |
| fillDataBuf(&pVars->mainDataStream, tmp1); |
| fillDataBuf(&pVars->mainDataStream, tmp2); |
| tmp1 = *(ptr++); |
| } |
| |
| if (temp&1) |
| { |
| fillDataBuf(&pVars->mainDataStream, tmp1); |
| } |
| |
| /* adjust circular buffer counter */ |
| pVars->mainDataStream.offset = module(pVars->mainDataStream.offset, BUFSIZE); |
| } |
| } |
| else |
| { |
| for (int32 nBytes = temp >> 1; nBytes != 0; nBytes--) /* read main data. */ |
| { |
| fillDataBuf(&pVars->mainDataStream, *(pVars->inputStream.pBuffer + module(offset++ , BUFSIZE))); |
| fillDataBuf(&pVars->mainDataStream, *(pVars->inputStream.pBuffer + module(offset++ , BUFSIZE))); |
| } |
| if (temp&1) |
| { |
| fillDataBuf(&pVars->mainDataStream, *(pVars->inputStream.pBuffer + module(offset , BUFSIZE))); |
| } |
| } |
| |
| |
| pVars->inputStream.usedBits += (temp) << INBUF_ARRAY_INDEX_SHIFT; |
| } |
| |
| |
| |
| |
| /*---------------------------------------------------------------------------- |
| ; FUNCTION CODE |
| ----------------------------------------------------------------------------*/ |
| |
| uint32 pvmp3_decoderMemRequirements(void) |
| { |
| uint32 size; |
| |
| size = (uint32) sizeof(tmp3dec_file); |
| return (size); |
| } |
| |
| |
| |
| /*---------------------------------------------------------------------------- |
| ; FUNCTION CODE |
| ----------------------------------------------------------------------------*/ |
| |
| #include "pvmp3_decode_huff_cw.h" |
| |
| void pvmp3_InitDecoder(tPVMP3DecoderExternal *pExt, |
| void *pMem) |
| { |
| |
| tmp3dec_file *pVars; |
| huffcodetab *pHuff; |
| |
| pVars = (tmp3dec_file *)pMem; |
| memset(pVars, 0, sizeof(*pVars)); |
| |
| pExt->totalNumberOfBitsUsed = 0; |
| pExt->inputBufferCurrentLength = 0; |
| pExt->inputBufferUsedLength = 0; |
| |
| pVars->inputStream.pBuffer = pExt->pInputBuffer; |
| |
| /* |
| * Initialize huffman decoding table |
| */ |
| |
| pHuff = pVars->ht; |
| pHuff[0].linbits = 0; |
| pHuff[0].pdec_huff_tab = pvmp3_decode_huff_cw_tab0; |
| pHuff[1].linbits = 0; |
| pHuff[1].pdec_huff_tab = pvmp3_decode_huff_cw_tab1; |
| pHuff[2].linbits = 0; |
| pHuff[2].pdec_huff_tab = pvmp3_decode_huff_cw_tab2; |
| pHuff[3].linbits = 0; |
| pHuff[3].pdec_huff_tab = pvmp3_decode_huff_cw_tab3; |
| pHuff[4].linbits = 0; |
| pHuff[4].pdec_huff_tab = pvmp3_decode_huff_cw_tab0; /* tbl 4 is not used */ |
| pHuff[5].linbits = 4; |
| pHuff[5].pdec_huff_tab = pvmp3_decode_huff_cw_tab5; |
| pHuff[6].linbits = 0; |
| pHuff[6].pdec_huff_tab = pvmp3_decode_huff_cw_tab6; |
| pHuff[7].linbits = 0; |
| pHuff[7].pdec_huff_tab = pvmp3_decode_huff_cw_tab7; |
| pHuff[8].linbits = 0; |
| pHuff[8].pdec_huff_tab = pvmp3_decode_huff_cw_tab8; |
| pHuff[9].linbits = 0; |
| pHuff[9].pdec_huff_tab = pvmp3_decode_huff_cw_tab9; |
| pHuff[10].linbits = 0; |
| pHuff[10].pdec_huff_tab = pvmp3_decode_huff_cw_tab10; |
| pHuff[11].linbits = 0; |
| pHuff[11].pdec_huff_tab = pvmp3_decode_huff_cw_tab11; |
| pHuff[12].linbits = 0; |
| pHuff[12].pdec_huff_tab = pvmp3_decode_huff_cw_tab12; |
| pHuff[13].linbits = 0; |
| pHuff[13].pdec_huff_tab = pvmp3_decode_huff_cw_tab13; |
| pHuff[14].linbits = 0; |
| pHuff[14].pdec_huff_tab = pvmp3_decode_huff_cw_tab0; /* tbl 14 is not used */ |
| pHuff[15].linbits = 0; |
| pHuff[15].pdec_huff_tab = pvmp3_decode_huff_cw_tab15; |
| pHuff[16].linbits = 1; |
| pHuff[16].pdec_huff_tab = pvmp3_decode_huff_cw_tab16; |
| pHuff[17].linbits = 2; |
| pHuff[17].pdec_huff_tab = pvmp3_decode_huff_cw_tab16; |
| pHuff[18].linbits = 3; |
| pHuff[18].pdec_huff_tab = pvmp3_decode_huff_cw_tab16; |
| pHuff[19].linbits = 4; |
| pHuff[19].pdec_huff_tab = pvmp3_decode_huff_cw_tab16; |
| pHuff[20].linbits = 6; |
| pHuff[20].pdec_huff_tab = pvmp3_decode_huff_cw_tab16; |
| pHuff[21].linbits = 8; |
| pHuff[21].pdec_huff_tab = pvmp3_decode_huff_cw_tab16; |
| pHuff[22].linbits = 10; |
| pHuff[22].pdec_huff_tab = pvmp3_decode_huff_cw_tab16; |
| pHuff[23].linbits = 13; |
| pHuff[23].pdec_huff_tab = pvmp3_decode_huff_cw_tab16; |
| pHuff[24].linbits = 4; |
| pHuff[24].pdec_huff_tab = pvmp3_decode_huff_cw_tab24; |
| pHuff[25].linbits = 5; |
| pHuff[25].pdec_huff_tab = pvmp3_decode_huff_cw_tab24; |
| pHuff[26].linbits = 6; |
| pHuff[26].pdec_huff_tab = pvmp3_decode_huff_cw_tab24; |
| pHuff[27].linbits = 7; |
| pHuff[27].pdec_huff_tab = pvmp3_decode_huff_cw_tab24; |
| pHuff[28].linbits = 8; |
| pHuff[28].pdec_huff_tab = pvmp3_decode_huff_cw_tab24; |
| pHuff[29].linbits = 9; |
| pHuff[29].pdec_huff_tab = pvmp3_decode_huff_cw_tab24; |
| pHuff[30].linbits = 11; |
| pHuff[30].pdec_huff_tab = pvmp3_decode_huff_cw_tab24; |
| pHuff[31].linbits = 13; |
| pHuff[31].pdec_huff_tab = pvmp3_decode_huff_cw_tab24; |
| pHuff[32].linbits = 0; |
| pHuff[32].pdec_huff_tab = pvmp3_decode_huff_cw_tab32; |
| pHuff[33].linbits = 0; |
| pHuff[33].pdec_huff_tab = pvmp3_decode_huff_cw_tab33; |
| |
| /* |
| * Initialize polysynthesis circular buffer mechanism |
| */ |
| /* clear buffers */ |
| |
| pvmp3_resetDecoder(pMem); |
| |
| } |
| |
| |
| /*---------------------------------------------------------------------------- |
| ; FUNCTION CODE |
| ----------------------------------------------------------------------------*/ |
| |
| |
| void pvmp3_resetDecoder(void *pMem) |
| { |
| |
| tmp3dec_file *pVars; |
| tmp3dec_chan *pChVars[CHAN]; |
| |
| pVars = (tmp3dec_file *)pMem; |
| pChVars[ LEFT] = &pVars->perChan[ LEFT]; |
| pChVars[RIGHT] = &pVars->perChan[RIGHT]; |
| |
| pVars->frame_start = 0; |
| |
| pVars->mainDataStream.offset = 0; |
| |
| pVars->mainDataStream.pBuffer = pVars->mainDataBuffer; |
| pVars->mainDataStream.usedBits = 0; |
| |
| |
| pVars->inputStream.usedBits = 0; // in bits |
| |
| |
| pChVars[ LEFT]->used_freq_lines = 575; |
| pChVars[RIGHT]->used_freq_lines = 575; |
| |
| |
| /* |
| * Initialize polysynthesis circular buffer mechanism |
| */ |
| |
| pv_memset((void*)&pChVars[ LEFT]->circ_buffer[576], |
| 0, |
| 480*sizeof(pChVars[ LEFT]->circ_buffer[0])); |
| pv_memset((void*)&pChVars[RIGHT]->circ_buffer[576], |
| 0, |
| 480*sizeof(pChVars[RIGHT]->circ_buffer[0])); |
| |
| |
| pv_memset((void*)pChVars[ LEFT]->overlap, |
| 0, |
| SUBBANDS_NUMBER*FILTERBANK_BANDS*sizeof(pChVars[ LEFT]->overlap[0])); |
| |
| |
| pv_memset((void*)pChVars[ RIGHT]->overlap, |
| 0, |
| SUBBANDS_NUMBER*FILTERBANK_BANDS*sizeof(pChVars[ RIGHT]->overlap[0])); |
| |
| |
| |
| |
| |
| /* |
| * Clear all the structures |
| */ |
| |
| |
| pv_memset((void*)&pVars->scaleFactors[RIGHT], |
| 0, |
| sizeof(mp3ScaleFactors)); |
| |
| pv_memset((void*)&pVars->scaleFactors[LEFT], |
| 0, |
| sizeof(mp3ScaleFactors)); |
| |
| pv_memset((void*)&pVars->sideInfo, |
| 0, |
| sizeof(mp3SideInfo)); |
| |
| pv_memset((void*)&pVars->sideInfo, |
| 0, |
| sizeof(mp3SideInfo)); |
| |
| } |
