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authorDave Chapman <dave@dchapman.com>2005-10-31 18:56:29 +0000
committerDave Chapman <dave@dchapman.com>2005-10-31 18:56:29 +0000
commit65de1cc6af31f547bd36d320f09cbcc6e6975421 (patch)
treed1ab6e97adfacb3ef8ca95cdf1c90fcb025271b0 /apps/codecs/libfaad/decoder.c
parentb83dc3861e5552a802767f37cb97d6b41c9f01cc (diff)
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Initial check-in of unmodified libfaad (part of the FAAD2 project). This is the last version of libfaad available under the GPL - the state of FAAD2 CVS at midnight on 2005-02-01
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@7699 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'apps/codecs/libfaad/decoder.c')
-rw-r--r--apps/codecs/libfaad/decoder.c1024
1 files changed, 1024 insertions, 0 deletions
diff --git a/apps/codecs/libfaad/decoder.c b/apps/codecs/libfaad/decoder.c
new file mode 100644
index 0000000000..b2c37dadb8
--- /dev/null
+++ b/apps/codecs/libfaad/decoder.c
@@ -0,0 +1,1024 @@
+/*
+** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding
+** Copyright (C) 2003-2004 M. Bakker, Ahead Software 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.
+**
+** Commercial non-GPL licensing of this software is possible.
+** For more info contact Ahead Software through Mpeg4AAClicense@nero.com.
+**
+** $Id$
+**/
+
+#include "common.h"
+#include "structs.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "decoder.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
+
+/* static function declarations */
+static void* aac_frame_decode(NeAACDecHandle hDecoder, NeAACDecFrameInfo *hInfo,
+ uint8_t *buffer, uint32_t buffer_size,
+ void **sample_buffer, uint32_t sample_buffer_size);
+static void create_channel_config(NeAACDecHandle hDecoder, NeAACDecFrameInfo *hInfo);
+
+
+char* NEAACDECAPI NeAACDecGetErrorMessage(uint8_t errcode)
+{
+ if (errcode >= NUM_ERROR_MESSAGES)
+ return NULL;
+ return err_msg[errcode];
+}
+
+uint32_t NEAACDECAPI 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;
+}
+
+NeAACDecHandle NEAACDECAPI NeAACDecOpen(void)
+{
+ uint8_t i;
+ NeAACDecHandle hDecoder = NULL;
+
+ if ((hDecoder = (NeAACDecHandle)faad_malloc(sizeof(NeAACDecStruct))) == NULL)
+ return NULL;
+
+ memset(hDecoder, 0, sizeof(NeAACDecStruct));
+
+ 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;
+#ifdef ERROR_RESILIENCE
+ hDecoder->aacSectionDataResilienceFlag = 0;
+ hDecoder->aacScalefactorDataResilienceFlag = 0;
+ hDecoder->aacSpectralDataResilienceFlag = 0;
+#endif
+ hDecoder->frameLength = 1024;
+
+ hDecoder->frame = 0;
+ hDecoder->sample_buffer = NULL;
+
+ 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 NEAACDECAPI NeAACDecGetCurrentConfiguration(NeAACDecHandle hDecoder)
+{
+ if (hDecoder)
+ {
+ NeAACDecConfigurationPtr config = &(hDecoder->config);
+
+ return config;
+ }
+
+ return NULL;
+}
+
+uint8_t NEAACDECAPI NeAACDecSetConfiguration(NeAACDecHandle hDecoder,
+ NeAACDecConfigurationPtr config)
+{
+ 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;
+}
+
+int32_t NEAACDECAPI NeAACDecInit(NeAACDecHandle hDecoder, uint8_t *buffer,
+ uint32_t buffer_size,
+ uint32_t *samplerate, uint8_t *channels)
+{
+ uint32_t bits = 0;
+ bitfile ld;
+ adif_header adif;
+ adts_header adts;
+
+ 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)
+ {
+ faad_initbits(&ld, buffer, buffer_size);
+
+ /* 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);
+ }
+ hDecoder->channelConfiguration = *channels;
+
+#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
+
+#ifdef SBR_DEC
+ /* implicit signalling */
+ if (*samplerate <= 24000 && !(hDecoder->config.dontUpSampleImplicitSBR))
+ {
+ *samplerate *= 2;
+ hDecoder->forceUpSampling = 1;
+ } else if (*samplerate > 24000 && !(hDecoder->config.dontUpSampleImplicitSBR)) {
+ 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 */
+int8_t NEAACDECAPI NeAACDecInit2(NeAACDecHandle hDecoder, uint8_t *pBuffer,
+ uint32_t SizeOfDecoderSpecificInfo,
+ uint32_t *samplerate, uint8_t *channels)
+{
+ 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));
+
+ /* 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
+int8_t NEAACDECAPI NeAACDecInitDRM(NeAACDecHandle *hDecoder, uint32_t samplerate,
+ uint8_t channels)
+{
+ 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 NEAACDECAPI NeAACDecClose(NeAACDecHandle hDecoder)
+{
+ uint8_t i;
+
+ 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 NEAACDECAPI NeAACDecPostSeekReset(NeAACDecHandle hDecoder, int32_t frame)
+{
+ if (hDecoder)
+ {
+ hDecoder->postSeekResetFlag = 1;
+
+ if (frame != -1)
+ hDecoder->frame = frame;
+ }
+}
+
+static void create_channel_config(NeAACDecHandle 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)
+ {
+ hInfo->channel_position[chpos++] = FRONT_CHANNEL_CENTER;
+ chdir--;
+ }
+ 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:
+ hInfo->num_front_channels = 1;
+ hInfo->channel_position[0] = FRONT_CHANNEL_CENTER;
+ 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* NEAACDECAPI NeAACDecDecode(NeAACDecHandle hDecoder,
+ NeAACDecFrameInfo *hInfo,
+ uint8_t *buffer, uint32_t buffer_size)
+{
+ return aac_frame_decode(hDecoder, hInfo, buffer, buffer_size, NULL, 0);
+}
+
+void* NEAACDECAPI NeAACDecDecode2(NeAACDecHandle hDecoder,
+ NeAACDecFrameInfo *hInfo,
+ uint8_t *buffer, uint32_t buffer_size,
+ void **sample_buffer, uint32_t sample_buffer_size)
+{
+ 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);
+}
+
+static void* aac_frame_decode(NeAACDecHandle hDecoder, NeAACDecFrameInfo *hInfo,
+ uint8_t *buffer, uint32_t buffer_size,
+ void **sample_buffer2, uint32_t sample_buffer_size)
+{
+ uint8_t channels = 0;
+ uint8_t output_channels = 0;
+ bitfile ld;
+ uint32_t bitsconsumed;
+ uint16_t frame_len;
+ void *sample_buffer;
+
+#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]));
+
+ /* 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
+
+#ifdef DRM
+ if (hDecoder->object_type == DRM_ER_LC)
+ {
+ /* We do not support stereo right now */
+ if (0) //(hDecoder->channelConfiguration == 2)
+ {
+ hInfo->error = 8; // 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 SCALABLE_DEC
+ if ((hDecoder->object_type == 6) || (hDecoder->object_type == DRM_ER_LC))
+ {
+ aac_scalable_main_element(hDecoder, hInfo, &ld, &hDecoder->pce, hDecoder->drc);
+ } else {
+#endif
+ raw_data_block(hDecoder, hInfo, &ld, &hDecoder->pce, hDecoder->drc);
+#ifdef SCALABLE_DEC
+ }
+#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 (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 (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);
+
+
+ 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:
+
+ faad_endbits(&ld);
+
+ /* cleanup */
+#ifdef ANALYSIS
+ fflush(stdout);
+#endif
+
+ return NULL;
+}