ref: 912b2ee70e9087b2e2510db01b4d65806e7c9d78
dir: /libfaad/decoder.c/
/* ** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding ** Copyright (C) 2003-2005 M. Bakker, Nero AG, http://www.nero.com ** ** This program is free software; you can redistribute it and/or modify ** it under the terms of the GNU General Public License as published by ** the Free Software Foundation; either version 2 of the License, or ** (at your option) any later version. ** ** This program is distributed in the hope that it will be useful, ** but WITHOUT ANY WARRANTY; without even the implied warranty of ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ** GNU General Public License for more details. ** ** You should have received a copy of the GNU General Public License ** along with this program; if not, write to the Free Software ** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. ** ** Any non-GPL usage of this software or parts of this software is strictly ** forbidden. ** ** The "appropriate copyright message" mentioned in section 2c of the GPLv2 ** must read: "Code from FAAD2 is copyright (c) Nero AG, www.nero.com" ** ** Commercial non-GPL licensing of this software is possible. ** For more info contact Nero AG through [email protected]. ** ** $Id: decoder.c,v 1.119 2015/01/24 14:21:05 knik Exp $ **/ #include "common.h" #include "structs.h" #include <stdlib.h> #include <stdio.h> #include <string.h> #include "mp4.h" #include "syntax.h" #include "error.h" #include "output.h" #include "filtbank.h" #include "drc.h" #ifdef SBR_DEC #include "sbr_dec.h" #include "sbr_syntax.h" #endif #ifdef SSR_DEC #include "ssr.h" #endif #ifdef ANALYSIS uint16_t dbg_count; #endif #if (defined WIN32 || defined _WIN32 || defined WIN64 || defined _WIN64) && !defined(PACKAGE_VERSION) #include "win32_ver.h" #endif /* static function declarations */ static void* aac_frame_decode(NeAACDecStruct *hDecoder, NeAACDecFrameInfo *hInfo, unsigned char *buffer, unsigned long buffer_size, void **sample_buffer2, unsigned long sample_buffer_size); static void create_channel_config(NeAACDecStruct *hDecoder, NeAACDecFrameInfo *hInfo); int NeAACDecGetVersion(char **faad_id_string, char **faad_copyright_string) { static char *libfaadName = PACKAGE_VERSION; static char *libCopyright = " Copyright 2002-2004: Ahead Software AG\n" " http://www.audiocoding.com\n" " bug tracking: https://sourceforge.net/p/faac/bugs/\n"; if (faad_id_string) *faad_id_string = libfaadName; if (faad_copyright_string) *faad_copyright_string = libCopyright; return 0; } char* NeAACDecGetErrorMessage(unsigned char errcode) { if (errcode >= NUM_ERROR_MESSAGES) return NULL; return err_msg[errcode]; } unsigned long NeAACDecGetCapabilities(void) { uint32_t cap = 0; /* can't do without it */ cap += LC_DEC_CAP; #ifdef MAIN_DEC cap += MAIN_DEC_CAP; #endif #ifdef LTP_DEC cap += LTP_DEC_CAP; #endif #ifdef LD_DEC cap += LD_DEC_CAP; #endif #ifdef ERROR_RESILIENCE cap += ERROR_RESILIENCE_CAP; #endif #ifdef FIXED_POINT cap += FIXED_POINT_CAP; #endif return cap; } const unsigned char mes[] = { 0x67,0x20,0x61,0x20,0x20,0x20,0x6f,0x20,0x72,0x20,0x65,0x20,0x6e,0x20,0x20,0x20,0x74,0x20,0x68,0x20,0x67,0x20,0x69,0x20,0x72,0x20,0x79,0x20,0x70,0x20,0x6f,0x20,0x63 }; NeAACDecHandle NeAACDecOpen(void) { uint8_t i; NeAACDecStruct *hDecoder = NULL; if ((hDecoder = (NeAACDecStruct*)faad_malloc(sizeof(NeAACDecStruct))) == NULL) return NULL; memset(hDecoder, 0, sizeof(NeAACDecStruct)); hDecoder->cmes = mes; hDecoder->config.outputFormat = FAAD_FMT_16BIT; hDecoder->config.defObjectType = MAIN; hDecoder->config.defSampleRate = 44100; /* Default: 44.1kHz */ hDecoder->config.downMatrix = 0; hDecoder->adts_header_present = 0; hDecoder->adif_header_present = 0; hDecoder->latm_header_present = 0; #ifdef ERROR_RESILIENCE hDecoder->aacSectionDataResilienceFlag = 0; hDecoder->aacScalefactorDataResilienceFlag = 0; hDecoder->aacSpectralDataResilienceFlag = 0; #endif hDecoder->frameLength = 1024; hDecoder->frame = 0; hDecoder->sample_buffer = NULL; hDecoder->__r1 = 1; hDecoder->__r2 = 1; for (i = 0; i < MAX_CHANNELS; i++) { hDecoder->window_shape_prev[i] = 0; hDecoder->time_out[i] = NULL; hDecoder->fb_intermed[i] = NULL; #ifdef SSR_DEC hDecoder->ssr_overlap[i] = NULL; hDecoder->prev_fmd[i] = NULL; #endif #ifdef MAIN_DEC hDecoder->pred_stat[i] = NULL; #endif #ifdef LTP_DEC hDecoder->ltp_lag[i] = 0; hDecoder->lt_pred_stat[i] = NULL; #endif } #ifdef SBR_DEC for (i = 0; i < MAX_SYNTAX_ELEMENTS; i++) { hDecoder->sbr[i] = NULL; } #endif hDecoder->drc = drc_init(REAL_CONST(1.0), REAL_CONST(1.0)); return hDecoder; } NeAACDecConfigurationPtr NeAACDecGetCurrentConfiguration(NeAACDecHandle hpDecoder) { NeAACDecStruct* hDecoder = (NeAACDecStruct*)hpDecoder; if (hDecoder) { NeAACDecConfigurationPtr config = &(hDecoder->config); return config; } return NULL; } unsigned char NeAACDecSetConfiguration(NeAACDecHandle hpDecoder, NeAACDecConfigurationPtr config) { NeAACDecStruct* hDecoder = (NeAACDecStruct*)hpDecoder; if (hDecoder && config) { /* check if we can decode this object type */ if (can_decode_ot(config->defObjectType) < 0) return 0; hDecoder->config.defObjectType = config->defObjectType; /* samplerate: anything but 0 should be possible */ if (config->defSampleRate == 0) return 0; hDecoder->config.defSampleRate = config->defSampleRate; /* check output format */ #ifdef FIXED_POINT if ((config->outputFormat < 1) || (config->outputFormat > 4)) return 0; #else if ((config->outputFormat < 1) || (config->outputFormat > 5)) return 0; #endif hDecoder->config.outputFormat = config->outputFormat; if (config->downMatrix > 1) return 0; hDecoder->config.downMatrix = config->downMatrix; /* OK */ return 1; } return 0; } static int latmCheck(latm_header *latm, bitfile *ld) { uint32_t good=0, bad=0, bits, m; while (ld->bytes_left) { bits = faad_latm_frame(latm, ld); if(bits==0xFFFFFFFF) bad++; else { good++; while(bits>0) { m = min(bits, 8); faad_getbits(ld, m); bits -= m; } } } return (good>0); } long NeAACDecInit(NeAACDecHandle hpDecoder, unsigned char *buffer, unsigned long buffer_size, unsigned long *samplerate, unsigned char *channels) { uint32_t bits = 0; bitfile ld; adif_header adif; adts_header adts; NeAACDecStruct* hDecoder = (NeAACDecStruct*)hpDecoder; if ((hDecoder == NULL) || (samplerate == NULL) || (channels == NULL)) return -1; hDecoder->sf_index = get_sr_index(hDecoder->config.defSampleRate); hDecoder->object_type = hDecoder->config.defObjectType; *samplerate = get_sample_rate(hDecoder->sf_index); *channels = 1; if (buffer != NULL) { #if 0 int is_latm; latm_header *l = &hDecoder->latm_config; #endif faad_initbits(&ld, buffer, buffer_size); #if 0 memset(l, 0, sizeof(latm_header)); is_latm = latmCheck(l, &ld); l->inited = 0; l->frameLength = 0; faad_rewindbits(&ld); if(is_latm && l->ASCbits>0) { int32_t x; hDecoder->latm_header_present = 1; x = NeAACDecInit2(hDecoder, l->ASC, (l->ASCbits+7)/8, samplerate, channels); if(x!=0) hDecoder->latm_header_present = 0; return x; } else #endif /* Check if an ADIF header is present */ if ((buffer[0] == 'A') && (buffer[1] == 'D') && (buffer[2] == 'I') && (buffer[3] == 'F')) { hDecoder->adif_header_present = 1; get_adif_header(&adif, &ld); faad_byte_align(&ld); hDecoder->sf_index = adif.pce[0].sf_index; hDecoder->object_type = adif.pce[0].object_type + 1; *samplerate = get_sample_rate(hDecoder->sf_index); *channels = adif.pce[0].channels; memcpy(&(hDecoder->pce), &(adif.pce[0]), sizeof(program_config)); hDecoder->pce_set = 1; bits = bit2byte(faad_get_processed_bits(&ld)); /* Check if an ADTS header is present */ } else if (faad_showbits(&ld, 12) == 0xfff) { hDecoder->adts_header_present = 1; adts.old_format = hDecoder->config.useOldADTSFormat; adts_frame(&adts, &ld); hDecoder->sf_index = adts.sf_index; hDecoder->object_type = adts.profile + 1; *samplerate = get_sample_rate(hDecoder->sf_index); *channels = (adts.channel_configuration > 6) ? 2 : adts.channel_configuration; } if (ld.error) { faad_endbits(&ld); return -1; } faad_endbits(&ld); } if (!*samplerate) return -1; #if (defined(PS_DEC) || defined(DRM_PS)) /* check if we have a mono file */ if (*channels == 1) { /* upMatrix to 2 channels for implicit signalling of PS */ *channels = 2; } #endif hDecoder->channelConfiguration = *channels; #ifdef SBR_DEC /* implicit signalling */ if (*samplerate <= 24000 && (hDecoder->config.dontUpSampleImplicitSBR == 0)) { *samplerate *= 2; hDecoder->forceUpSampling = 1; } else if (*samplerate > 24000 && (hDecoder->config.dontUpSampleImplicitSBR == 0)) { hDecoder->downSampledSBR = 1; } #endif /* must be done before frameLength is divided by 2 for LD */ #ifdef SSR_DEC if (hDecoder->object_type == SSR) hDecoder->fb = ssr_filter_bank_init(hDecoder->frameLength/SSR_BANDS); else #endif hDecoder->fb = filter_bank_init(hDecoder->frameLength); #ifdef LD_DEC if (hDecoder->object_type == LD) hDecoder->frameLength >>= 1; #endif if (can_decode_ot(hDecoder->object_type) < 0) return -1; return bits; } /* Init the library using a DecoderSpecificInfo */ char NeAACDecInit2(NeAACDecHandle hpDecoder, unsigned char *pBuffer, unsigned long SizeOfDecoderSpecificInfo, unsigned long *samplerate, unsigned char *channels) { NeAACDecStruct* hDecoder = (NeAACDecStruct*)hpDecoder; int8_t rc; mp4AudioSpecificConfig mp4ASC; if((hDecoder == NULL) || (pBuffer == NULL) || (SizeOfDecoderSpecificInfo < 2) || (samplerate == NULL) || (channels == NULL)) { return -1; } hDecoder->adif_header_present = 0; hDecoder->adts_header_present = 0; /* decode the audio specific config */ rc = AudioSpecificConfig2(pBuffer, SizeOfDecoderSpecificInfo, &mp4ASC, &(hDecoder->pce), hDecoder->latm_header_present); /* copy the relevant info to the decoder handle */ *samplerate = mp4ASC.samplingFrequency; if (mp4ASC.channelsConfiguration) { *channels = mp4ASC.channelsConfiguration; } else { *channels = hDecoder->pce.channels; hDecoder->pce_set = 1; } #if (defined(PS_DEC) || defined(DRM_PS)) /* check if we have a mono file */ if (*channels == 1) { /* upMatrix to 2 channels for implicit signalling of PS */ *channels = 2; } #endif hDecoder->sf_index = mp4ASC.samplingFrequencyIndex; hDecoder->object_type = mp4ASC.objectTypeIndex; #ifdef ERROR_RESILIENCE hDecoder->aacSectionDataResilienceFlag = mp4ASC.aacSectionDataResilienceFlag; hDecoder->aacScalefactorDataResilienceFlag = mp4ASC.aacScalefactorDataResilienceFlag; hDecoder->aacSpectralDataResilienceFlag = mp4ASC.aacSpectralDataResilienceFlag; #endif #ifdef SBR_DEC hDecoder->sbr_present_flag = mp4ASC.sbr_present_flag; hDecoder->downSampledSBR = mp4ASC.downSampledSBR; if (hDecoder->config.dontUpSampleImplicitSBR == 0) hDecoder->forceUpSampling = mp4ASC.forceUpSampling; else hDecoder->forceUpSampling = 0; /* AAC core decoder samplerate is 2 times as low */ if (((hDecoder->sbr_present_flag == 1)&&(!hDecoder->downSampledSBR)) || hDecoder->forceUpSampling == 1) { hDecoder->sf_index = get_sr_index(mp4ASC.samplingFrequency / 2); } #endif if (rc != 0) { return rc; } hDecoder->channelConfiguration = mp4ASC.channelsConfiguration; if (mp4ASC.frameLengthFlag) #ifdef ALLOW_SMALL_FRAMELENGTH hDecoder->frameLength = 960; #else return -1; #endif /* must be done before frameLength is divided by 2 for LD */ #ifdef SSR_DEC if (hDecoder->object_type == SSR) hDecoder->fb = ssr_filter_bank_init(hDecoder->frameLength/SSR_BANDS); else #endif hDecoder->fb = filter_bank_init(hDecoder->frameLength); #ifdef LD_DEC if (hDecoder->object_type == LD) hDecoder->frameLength >>= 1; #endif return 0; } #ifdef DRM char NeAACDecInitDRM(NeAACDecHandle *hpDecoder, unsigned long samplerate, unsigned char channels) { NeAACDecStruct** hDecoder = (NeAACDecStruct**)hpDecoder; if (hDecoder == NULL) return 1; /* error */ NeAACDecClose(*hDecoder); *hDecoder = NeAACDecOpen(); /* Special object type defined for DRM */ (*hDecoder)->config.defObjectType = DRM_ER_LC; (*hDecoder)->config.defSampleRate = samplerate; #ifdef ERROR_RESILIENCE // This shoudl always be defined for DRM (*hDecoder)->aacSectionDataResilienceFlag = 1; /* VCB11 */ (*hDecoder)->aacScalefactorDataResilienceFlag = 0; /* no RVLC */ (*hDecoder)->aacSpectralDataResilienceFlag = 1; /* HCR */ #endif (*hDecoder)->frameLength = 960; (*hDecoder)->sf_index = get_sr_index((*hDecoder)->config.defSampleRate); (*hDecoder)->object_type = (*hDecoder)->config.defObjectType; if ((channels == DRMCH_STEREO) || (channels == DRMCH_SBR_STEREO)) (*hDecoder)->channelConfiguration = 2; else (*hDecoder)->channelConfiguration = 1; #ifdef SBR_DEC if ((channels == DRMCH_MONO) || (channels == DRMCH_STEREO)) (*hDecoder)->sbr_present_flag = 0; else (*hDecoder)->sbr_present_flag = 1; #endif (*hDecoder)->fb = filter_bank_init((*hDecoder)->frameLength); return 0; } #endif void NeAACDecClose(NeAACDecHandle hpDecoder) { uint8_t i; NeAACDecStruct* hDecoder = (NeAACDecStruct*)hpDecoder; if (hDecoder == NULL) return; #ifdef PROFILE printf("AAC decoder total: %I64d cycles\n", hDecoder->cycles); printf("requant: %I64d cycles\n", hDecoder->requant_cycles); printf("spectral_data: %I64d cycles\n", hDecoder->spectral_cycles); printf("scalefactors: %I64d cycles\n", hDecoder->scalefac_cycles); printf("output: %I64d cycles\n", hDecoder->output_cycles); #endif for (i = 0; i < MAX_CHANNELS; i++) { if (hDecoder->time_out[i]) faad_free(hDecoder->time_out[i]); if (hDecoder->fb_intermed[i]) faad_free(hDecoder->fb_intermed[i]); #ifdef SSR_DEC if (hDecoder->ssr_overlap[i]) faad_free(hDecoder->ssr_overlap[i]); if (hDecoder->prev_fmd[i]) faad_free(hDecoder->prev_fmd[i]); #endif #ifdef MAIN_DEC if (hDecoder->pred_stat[i]) faad_free(hDecoder->pred_stat[i]); #endif #ifdef LTP_DEC if (hDecoder->lt_pred_stat[i]) faad_free(hDecoder->lt_pred_stat[i]); #endif } #ifdef SSR_DEC if (hDecoder->object_type == SSR) ssr_filter_bank_end(hDecoder->fb); else #endif filter_bank_end(hDecoder->fb); drc_end(hDecoder->drc); if (hDecoder->sample_buffer) faad_free(hDecoder->sample_buffer); #ifdef SBR_DEC for (i = 0; i < MAX_SYNTAX_ELEMENTS; i++) { if (hDecoder->sbr[i]) sbrDecodeEnd(hDecoder->sbr[i]); } #endif if (hDecoder) faad_free(hDecoder); } void NeAACDecPostSeekReset(NeAACDecHandle hpDecoder, long frame) { NeAACDecStruct* hDecoder = (NeAACDecStruct*)hpDecoder; if (hDecoder) { hDecoder->postSeekResetFlag = 1; if (frame != -1) hDecoder->frame = frame; } } static void create_channel_config(NeAACDecStruct *hDecoder, NeAACDecFrameInfo *hInfo) { hInfo->num_front_channels = 0; hInfo->num_side_channels = 0; hInfo->num_back_channels = 0; hInfo->num_lfe_channels = 0; memset(hInfo->channel_position, 0, MAX_CHANNELS*sizeof(uint8_t)); if (hDecoder->downMatrix) { hInfo->num_front_channels = 2; hInfo->channel_position[0] = FRONT_CHANNEL_LEFT; hInfo->channel_position[1] = FRONT_CHANNEL_RIGHT; return; } /* check if there is a PCE */ if (hDecoder->pce_set) { uint8_t i, chpos = 0; uint8_t chdir, back_center = 0; hInfo->num_front_channels = hDecoder->pce.num_front_channels; hInfo->num_side_channels = hDecoder->pce.num_side_channels; hInfo->num_back_channels = hDecoder->pce.num_back_channels; hInfo->num_lfe_channels = hDecoder->pce.num_lfe_channels; chdir = hInfo->num_front_channels; if (chdir & 1) { #if (defined(PS_DEC) || defined(DRM_PS)) /* When PS is enabled output is always stereo */ hInfo->channel_position[chpos++] = FRONT_CHANNEL_LEFT; hInfo->channel_position[chpos++] = FRONT_CHANNEL_RIGHT; #else hInfo->channel_position[chpos++] = FRONT_CHANNEL_CENTER; chdir--; #endif } for (i = 0; i < chdir; i += 2) { hInfo->channel_position[chpos++] = FRONT_CHANNEL_LEFT; hInfo->channel_position[chpos++] = FRONT_CHANNEL_RIGHT; } for (i = 0; i < hInfo->num_side_channels; i += 2) { hInfo->channel_position[chpos++] = SIDE_CHANNEL_LEFT; hInfo->channel_position[chpos++] = SIDE_CHANNEL_RIGHT; } chdir = hInfo->num_back_channels; if (chdir & 1) { back_center = 1; chdir--; } for (i = 0; i < chdir; i += 2) { hInfo->channel_position[chpos++] = BACK_CHANNEL_LEFT; hInfo->channel_position[chpos++] = BACK_CHANNEL_RIGHT; } if (back_center) { hInfo->channel_position[chpos++] = BACK_CHANNEL_CENTER; } for (i = 0; i < hInfo->num_lfe_channels; i++) { hInfo->channel_position[chpos++] = LFE_CHANNEL; } } else { switch (hDecoder->channelConfiguration) { case 1: #if (defined(PS_DEC) || defined(DRM_PS)) /* When PS is enabled output is always stereo */ hInfo->num_front_channels = 2; hInfo->channel_position[0] = FRONT_CHANNEL_LEFT; hInfo->channel_position[1] = FRONT_CHANNEL_RIGHT; #else hInfo->num_front_channels = 1; hInfo->channel_position[0] = FRONT_CHANNEL_CENTER; #endif break; case 2: hInfo->num_front_channels = 2; hInfo->channel_position[0] = FRONT_CHANNEL_LEFT; hInfo->channel_position[1] = FRONT_CHANNEL_RIGHT; break; case 3: hInfo->num_front_channels = 3; hInfo->channel_position[0] = FRONT_CHANNEL_CENTER; hInfo->channel_position[1] = FRONT_CHANNEL_LEFT; hInfo->channel_position[2] = FRONT_CHANNEL_RIGHT; break; case 4: hInfo->num_front_channels = 3; hInfo->num_back_channels = 1; hInfo->channel_position[0] = FRONT_CHANNEL_CENTER; hInfo->channel_position[1] = FRONT_CHANNEL_LEFT; hInfo->channel_position[2] = FRONT_CHANNEL_RIGHT; hInfo->channel_position[3] = BACK_CHANNEL_CENTER; break; case 5: hInfo->num_front_channels = 3; hInfo->num_back_channels = 2; hInfo->channel_position[0] = FRONT_CHANNEL_CENTER; hInfo->channel_position[1] = FRONT_CHANNEL_LEFT; hInfo->channel_position[2] = FRONT_CHANNEL_RIGHT; hInfo->channel_position[3] = BACK_CHANNEL_LEFT; hInfo->channel_position[4] = BACK_CHANNEL_RIGHT; break; case 6: hInfo->num_front_channels = 3; hInfo->num_back_channels = 2; hInfo->num_lfe_channels = 1; hInfo->channel_position[0] = FRONT_CHANNEL_CENTER; hInfo->channel_position[1] = FRONT_CHANNEL_LEFT; hInfo->channel_position[2] = FRONT_CHANNEL_RIGHT; hInfo->channel_position[3] = BACK_CHANNEL_LEFT; hInfo->channel_position[4] = BACK_CHANNEL_RIGHT; hInfo->channel_position[5] = LFE_CHANNEL; break; case 7: hInfo->num_front_channels = 3; hInfo->num_side_channels = 2; hInfo->num_back_channels = 2; hInfo->num_lfe_channels = 1; hInfo->channel_position[0] = FRONT_CHANNEL_CENTER; hInfo->channel_position[1] = FRONT_CHANNEL_LEFT; hInfo->channel_position[2] = FRONT_CHANNEL_RIGHT; hInfo->channel_position[3] = SIDE_CHANNEL_LEFT; hInfo->channel_position[4] = SIDE_CHANNEL_RIGHT; hInfo->channel_position[5] = BACK_CHANNEL_LEFT; hInfo->channel_position[6] = BACK_CHANNEL_RIGHT; hInfo->channel_position[7] = LFE_CHANNEL; break; default: /* channelConfiguration == 0 || channelConfiguration > 7 */ { uint8_t i; uint8_t ch = hDecoder->fr_channels - hDecoder->has_lfe; if (ch & 1) /* there's either a center front or a center back channel */ { uint8_t ch1 = (ch-1)/2; if (hDecoder->first_syn_ele == ID_SCE) { hInfo->num_front_channels = ch1 + 1; hInfo->num_back_channels = ch1; hInfo->channel_position[0] = FRONT_CHANNEL_CENTER; for (i = 1; i <= ch1; i+=2) { hInfo->channel_position[i] = FRONT_CHANNEL_LEFT; hInfo->channel_position[i+1] = FRONT_CHANNEL_RIGHT; } for (i = ch1+1; i < ch; i+=2) { hInfo->channel_position[i] = BACK_CHANNEL_LEFT; hInfo->channel_position[i+1] = BACK_CHANNEL_RIGHT; } } else { hInfo->num_front_channels = ch1; hInfo->num_back_channels = ch1 + 1; for (i = 0; i < ch1; i+=2) { hInfo->channel_position[i] = FRONT_CHANNEL_LEFT; hInfo->channel_position[i+1] = FRONT_CHANNEL_RIGHT; } for (i = ch1; i < ch-1; i+=2) { hInfo->channel_position[i] = BACK_CHANNEL_LEFT; hInfo->channel_position[i+1] = BACK_CHANNEL_RIGHT; } hInfo->channel_position[ch-1] = BACK_CHANNEL_CENTER; } } else { uint8_t ch1 = (ch)/2; hInfo->num_front_channels = ch1; hInfo->num_back_channels = ch1; if (ch1 & 1) { hInfo->channel_position[0] = FRONT_CHANNEL_CENTER; for (i = 1; i <= ch1; i+=2) { hInfo->channel_position[i] = FRONT_CHANNEL_LEFT; hInfo->channel_position[i+1] = FRONT_CHANNEL_RIGHT; } for (i = ch1+1; i < ch-1; i+=2) { hInfo->channel_position[i] = BACK_CHANNEL_LEFT; hInfo->channel_position[i+1] = BACK_CHANNEL_RIGHT; } hInfo->channel_position[ch-1] = BACK_CHANNEL_CENTER; } else { for (i = 0; i < ch1; i+=2) { hInfo->channel_position[i] = FRONT_CHANNEL_LEFT; hInfo->channel_position[i+1] = FRONT_CHANNEL_RIGHT; } for (i = ch1; i < ch; i+=2) { hInfo->channel_position[i] = BACK_CHANNEL_LEFT; hInfo->channel_position[i+1] = BACK_CHANNEL_RIGHT; } } } hInfo->num_lfe_channels = hDecoder->has_lfe; for (i = ch; i < hDecoder->fr_channels; i++) { hInfo->channel_position[i] = LFE_CHANNEL; } } break; } } } void* NeAACDecDecode(NeAACDecHandle hpDecoder, NeAACDecFrameInfo *hInfo, unsigned char *buffer, unsigned long buffer_size) { NeAACDecStruct* hDecoder = (NeAACDecStruct*)hpDecoder; return aac_frame_decode(hDecoder, hInfo, buffer, buffer_size, NULL, 0); } void* NeAACDecDecode2(NeAACDecHandle hpDecoder, NeAACDecFrameInfo *hInfo, unsigned char *buffer, unsigned long buffer_size, void **sample_buffer, unsigned long sample_buffer_size) { NeAACDecStruct* hDecoder = (NeAACDecStruct*)hpDecoder; if ((sample_buffer == NULL) || (sample_buffer_size == 0)) { hInfo->error = 27; return NULL; } return aac_frame_decode(hDecoder, hInfo, buffer, buffer_size, sample_buffer, sample_buffer_size); } #ifdef DRM #define ERROR_STATE_INIT 6 static void conceal_output(NeAACDecStruct *hDecoder, uint16_t frame_len, uint8_t out_ch, void *sample_buffer) { return; } #endif static void* aac_frame_decode(NeAACDecStruct *hDecoder, NeAACDecFrameInfo *hInfo, unsigned char *buffer, unsigned long buffer_size, void **sample_buffer2, unsigned long sample_buffer_size) { uint16_t i; uint8_t channels = 0; uint8_t output_channels = 0; bitfile ld = {0}; uint32_t bitsconsumed; uint16_t frame_len; void *sample_buffer; uint32_t startbit=0, endbit=0, payload_bits=0; #ifdef PROFILE int64_t count = faad_get_ts(); #endif /* safety checks */ if ((hDecoder == NULL) || (hInfo == NULL) || (buffer == NULL)) { return NULL; } #if 0 printf("%d\n", buffer_size*8); #endif frame_len = hDecoder->frameLength; memset(hInfo, 0, sizeof(NeAACDecFrameInfo)); memset(hDecoder->internal_channel, 0, MAX_CHANNELS*sizeof(hDecoder->internal_channel[0])); #ifdef USE_TIME_LIMIT if ((TIME_LIMIT * get_sample_rate(hDecoder->sf_index)) > hDecoder->TL_count) { hDecoder->TL_count += 1024; } else { hInfo->error = (NUM_ERROR_MESSAGES-1); goto error; } #endif /* check for some common metadata tag types in the bitstream * No need to return an error */ /* ID3 */ if (buffer_size >= 128) { if (memcmp(buffer, "TAG", 3) == 0) { /* found it */ hInfo->bytesconsumed = 128; /* 128 bytes fixed size */ /* no error, but no output either */ return NULL; } } /* initialize the bitstream */ faad_initbits(&ld, buffer, buffer_size); #if 0 { int i; for (i = 0; i < ((buffer_size+3)>>2); i++) { uint8_t *buf; uint32_t temp = 0; buf = faad_getbitbuffer(&ld, 32); //temp = getdword((void*)buf); temp = *((uint32_t*)buf); printf("0x%.8X\n", temp); free(buf); } faad_endbits(&ld); faad_initbits(&ld, buffer, buffer_size); } #endif #if 0 if(hDecoder->latm_header_present) { payload_bits = faad_latm_frame(&hDecoder->latm_config, &ld); startbit = faad_get_processed_bits(&ld); if(payload_bits == -1U) { hInfo->error = 1; goto error; } } #endif #ifdef DRM if (hDecoder->object_type == DRM_ER_LC) { /* We do not support stereo right now */ if (0) //(hDecoder->channelConfiguration == 2) { hInfo->error = 28; // Throw CRC error goto error; } faad_getbits(&ld, 8 DEBUGVAR(1,1,"NeAACDecDecode(): skip CRC")); } #endif if (hDecoder->adts_header_present) { adts_header adts; adts.old_format = hDecoder->config.useOldADTSFormat; if ((hInfo->error = adts_frame(&adts, &ld)) > 0) goto error; /* MPEG2 does byte_alignment() here, * but ADTS header is always multiple of 8 bits in MPEG2 * so not needed to actually do it. */ } #ifdef ANALYSIS dbg_count = 0; #endif /* decode the complete bitstream */ #ifdef DRM if (/*(hDecoder->object_type == 6) ||*/ (hDecoder->object_type == DRM_ER_LC)) { DRM_aac_scalable_main_element(hDecoder, hInfo, &ld, &hDecoder->pce, hDecoder->drc); } else { #endif raw_data_block(hDecoder, hInfo, &ld, &hDecoder->pce, hDecoder->drc); #ifdef DRM } #endif #if 0 if(hDecoder->latm_header_present) { endbit = faad_get_processed_bits(&ld); if(endbit-startbit > payload_bits) fprintf(stderr, "\r\nERROR, too many payload bits read: %u > %d. Please. report with a link to a sample\n", endbit-startbit, payload_bits); if(hDecoder->latm_config.otherDataLenBits > 0) faad_getbits(&ld, hDecoder->latm_config.otherDataLenBits); faad_byte_align(&ld); } #endif channels = hDecoder->fr_channels; if (hInfo->error > 0) goto error; /* safety check */ if (channels == 0 || channels > MAX_CHANNELS) { /* invalid number of channels */ hInfo->error = 12; goto error; } /* no more bit reading after this */ bitsconsumed = faad_get_processed_bits(&ld); hInfo->bytesconsumed = bit2byte(bitsconsumed); if (ld.error) { hInfo->error = 14; goto error; } faad_endbits(&ld); if (!hDecoder->adts_header_present && !hDecoder->adif_header_present #if 0 && !hDecoder->latm_header_present #endif ) { if (hDecoder->channelConfiguration == 0) hDecoder->channelConfiguration = channels; if (channels == 8) /* 7.1 */ hDecoder->channelConfiguration = 7; if (channels == 7) /* not a standard channelConfiguration */ hDecoder->channelConfiguration = 0; } if ((channels == 5 || channels == 6) && hDecoder->config.downMatrix) { hDecoder->downMatrix = 1; output_channels = 2; } else { output_channels = channels; } #if (defined(PS_DEC) || defined(DRM_PS)) hDecoder->upMatrix = 0; /* check if we have a mono file */ if (output_channels == 1) { /* upMatrix to 2 channels for implicit signalling of PS */ hDecoder->upMatrix = 1; output_channels = 2; } #endif /* Make a channel configuration based on either a PCE or a channelConfiguration */ create_channel_config(hDecoder, hInfo); /* number of samples in this frame */ hInfo->samples = frame_len*output_channels; /* number of channels in this frame */ hInfo->channels = output_channels; /* samplerate */ hInfo->samplerate = get_sample_rate(hDecoder->sf_index); /* object type */ hInfo->object_type = hDecoder->object_type; /* sbr */ hInfo->sbr = NO_SBR; /* header type */ hInfo->header_type = RAW; if (hDecoder->adif_header_present) hInfo->header_type = ADIF; if (hDecoder->adts_header_present) hInfo->header_type = ADTS; #if 0 if (hDecoder->latm_header_present) hInfo->header_type = LATM; #endif #if (defined(PS_DEC) || defined(DRM_PS)) hInfo->ps = hDecoder->ps_used_global; #endif /* check if frame has channel elements */ if (channels == 0) { hDecoder->frame++; return NULL; } /* allocate the buffer for the final samples */ if ((hDecoder->sample_buffer == NULL) || (hDecoder->alloced_channels != output_channels)) { static const uint8_t str[] = { sizeof(int16_t), sizeof(int32_t), sizeof(int32_t), sizeof(float32_t), sizeof(double), sizeof(int16_t), sizeof(int16_t), sizeof(int16_t), sizeof(int16_t), 0, 0, 0 }; uint8_t stride = str[hDecoder->config.outputFormat-1]; #ifdef SBR_DEC if (((hDecoder->sbr_present_flag == 1)&&(!hDecoder->downSampledSBR)) || (hDecoder->forceUpSampling == 1)) { stride = 2 * stride; } #endif /* check if we want to use internal sample_buffer */ if (sample_buffer_size == 0) { if (hDecoder->sample_buffer) faad_free(hDecoder->sample_buffer); hDecoder->sample_buffer = NULL; hDecoder->sample_buffer = faad_malloc(frame_len*output_channels*stride); } else if (sample_buffer_size < frame_len*output_channels*stride) { /* provided sample buffer is not big enough */ hInfo->error = 27; return NULL; } hDecoder->alloced_channels = output_channels; } if (sample_buffer_size == 0) { sample_buffer = hDecoder->sample_buffer; } else { sample_buffer = *sample_buffer2; } #ifdef SBR_DEC if ((hDecoder->sbr_present_flag == 1) || (hDecoder->forceUpSampling == 1)) { uint8_t ele; /* this data is different when SBR is used or when the data is upsampled */ if (!hDecoder->downSampledSBR) { frame_len *= 2; hInfo->samples *= 2; hInfo->samplerate *= 2; } /* check if every element was provided with SBR data */ for (ele = 0; ele < hDecoder->fr_ch_ele; ele++) { if (hDecoder->sbr[ele] == NULL) { hInfo->error = 25; goto error; } } /* sbr */ if (hDecoder->sbr_present_flag == 1) { hInfo->object_type = HE_AAC; hInfo->sbr = SBR_UPSAMPLED; } else { hInfo->sbr = NO_SBR_UPSAMPLED; } if (hDecoder->downSampledSBR) { hInfo->sbr = SBR_DOWNSAMPLED; } } #endif sample_buffer = output_to_PCM(hDecoder, hDecoder->time_out, sample_buffer, output_channels, frame_len, hDecoder->config.outputFormat); #ifdef DRM //conceal_output(hDecoder, frame_len, output_channels, sample_buffer); #endif hDecoder->postSeekResetFlag = 0; hDecoder->frame++; #ifdef LD_DEC if (hDecoder->object_type != LD) { #endif if (hDecoder->frame <= 1) hInfo->samples = 0; #ifdef LD_DEC } else { /* LD encoders will give lower delay */ if (hDecoder->frame <= 0) hInfo->samples = 0; } #endif /* cleanup */ #ifdef ANALYSIS fflush(stdout); #endif #ifdef PROFILE count = faad_get_ts() - count; hDecoder->cycles += count; #endif return sample_buffer; error: #ifdef DRM hDecoder->error_state = ERROR_STATE_INIT; #endif /* reset filterbank state */ for (i = 0; i < MAX_CHANNELS; i++) { if (hDecoder->fb_intermed[i] != NULL) { memset(hDecoder->fb_intermed[i], 0, hDecoder->frameLength*sizeof(real_t)); } } #ifdef SBR_DEC for (i = 0; i < MAX_SYNTAX_ELEMENTS; i++) { if (hDecoder->sbr[i] != NULL) { sbrReset(hDecoder->sbr[i]); } } #endif faad_endbits(&ld); /* cleanup */ #ifdef ANALYSIS fflush(stdout); #endif return NULL; }