/*
* adts_header
*/
int get_adts_header(faacDecHandle hDecoder)
{
int sync = 0;
ADTS_Header *p = &hDecoder->adts_header;
faad_byte_align(&hDecoder->ld);
sync = faad_showbits(&hDecoder->ld, 12);
while (sync != 4096 - 1) {
faad_flushbits(&hDecoder->ld, 8);
if (faad_bits_done(&hDecoder->ld) != 0) {
return -1;
}
sync = faad_showbits(&hDecoder->ld, 12);
}
faad_flushbits(&hDecoder->ld, 12);
if (hDecoder->frameNum) {
faad_getbits(&hDecoder->ld, 16);
#if 0
if (p->fixed.ID == 0) /* MPEG2 AAC doesn't have this */
faad_getbits(&hDecoder->ld, 2);
#endif
} else {
/* Syncword found, proceed to read in the fixed ADTS header */
p->fixed.ID = faad_get1bit(&hDecoder->ld); /* 0 -> MPEG4, 1 -> MPEG2 */
hDecoder->isMpeg4 = !p->fixed.ID;
p->fixed.layer = faad_getbits(&hDecoder->ld, 2);
p->fixed.protection_absent = faad_get1bit(&hDecoder->ld);
hDecoder->mc_info.object_type = p->fixed.object_type = faad_getbits(&hDecoder->ld, 2);
hDecoder->mc_info.sampling_rate_idx = p->fixed.sampling_rate_idx = faad_getbits(&hDecoder->ld, 4);
p->fixed.private_bit = faad_get1bit(&hDecoder->ld);
p->fixed.channel_configuration = faad_getbits(&hDecoder->ld, 3);
p->fixed.original_copy = faad_get1bit(&hDecoder->ld);
p->fixed.home = faad_get1bit(&hDecoder->ld);
#if 0
if (p->fixed.ID == 0) /* MPEG2 AAC doesn't have this */
p->fixed.emphasis = faad_getbits(&hDecoder->ld, 2);
#endif
}
/* ...and the variable ADTS header */
p->variable.copy_id_bit = faad_get1bit(&hDecoder->ld);
p->variable.copy_id_start = faad_get1bit(&hDecoder->ld);
p->variable.frame_length = faad_getbits(&hDecoder->ld, 13);
p->variable.buffer_fullness = faad_getbits(&hDecoder->ld, 11);
p->variable.raw_blocks = faad_getbits(&hDecoder->ld, 2);
/* ADTS error check (ignored) */
if(!p->fixed.protection_absent)
faad_getbits(&hDecoder->ld, 16);
return 0;
}
int get_prog_config(faacDecHandle hDecoder, ProgConfig *p)
{
int i, j, tag;
tag = faad_getbits(&hDecoder->ld, LEN_TAG);
p->object_type = faad_getbits(&hDecoder->ld, LEN_OBJECTTYPE);
p->sampling_rate_idx = faad_getbits(&hDecoder->ld, LEN_SAMP_IDX);
p->front.num_ele = faad_getbits(&hDecoder->ld, LEN_NUM_ELE);
p->side.num_ele = faad_getbits(&hDecoder->ld, LEN_NUM_ELE);
p->back.num_ele = faad_getbits(&hDecoder->ld, LEN_NUM_ELE);
p->lfe.num_ele = faad_getbits(&hDecoder->ld, LEN_NUM_LFE);
p->data.num_ele = faad_getbits(&hDecoder->ld, LEN_NUM_DAT);
p->coupling.num_ele = faad_getbits(&hDecoder->ld, LEN_NUM_CCE);
if ((p->mono_mix.present = faad_getbits(&hDecoder->ld, LEN_MIX_PRES)) == 1)
p->mono_mix.ele_tag = faad_getbits(&hDecoder->ld, LEN_TAG);
if ((p->stereo_mix.present = faad_getbits(&hDecoder->ld, LEN_MIX_PRES)) == 1)
p->stereo_mix.ele_tag = faad_getbits(&hDecoder->ld, LEN_TAG);
if ((p->matrix_mix.present = faad_getbits(&hDecoder->ld, LEN_MIX_PRES)) == 1) {
p->matrix_mix.ele_tag = faad_getbits(&hDecoder->ld, LEN_MMIX_IDX);
p->matrix_mix.pseudo_enab = faad_getbits(&hDecoder->ld, LEN_PSUR_ENAB);
}
get_ele_list(hDecoder, &p->front, 1);
get_ele_list(hDecoder, &p->side, 1);
get_ele_list(hDecoder, &p->back, 1);
get_ele_list(hDecoder, &p->lfe, 0);
get_ele_list(hDecoder, &p->data, 0);
get_ele_list(hDecoder, &p->coupling, 1);
/*
* if this is a MPEG4 file and the PCE is inside a raw_data_block()
* this should be aligned to beginning of raw_data_block() boundary,
* not byte boundary (FIXME!!!)
*/
faad_byte_align(&hDecoder->ld);
j = faad_getbits(&hDecoder->ld, LEN_COMMENT_BYTES);
for (i=0; i<j; i++)
p->comments[i] = (char)faad_getbits(&hDecoder->ld, LEN_BYTE);
p->comments[i] = 0; /* null terminator for string */
/* activate new program configuration if appropriate */
if (hDecoder->current_program < 0)
hDecoder->current_program = tag; /* always select new program */
if (tag == hDecoder->current_program) {
/* enter configuration into MC_Info structure */
if ((hDecoder->pceChannels = enter_mc_info(hDecoder, &hDecoder->mc_info, p)) < 0)
return -1;
/* inhibit default configuration */
hDecoder->default_config = 0;
}
return tag;
}
int8_t AudioSpecificConfig2(uint8_t *pBuffer,
uint32_t buffer_size,
mp4AudioSpecificConfig *mp4ASC,
program_config *pce,
uint8_t short_form)
{
uint8_t ret = 0;
bitfile ld;
faad_initbits(&ld, pBuffer, buffer_size);
faad_byte_align(&ld);
ret = AudioSpecificConfigFromBitfile(&ld, mp4ASC, pce, buffer_size, short_form);
faad_endbits(&ld);
return ret;
}
int getdata(faacDecHandle hDecoder, int *tag, int *dt_cnt, byte *data_bytes)
{
int i, align_flag, cnt;
*tag = faad_getbits(&hDecoder->ld, LEN_TAG);
align_flag = faad_getbits(&hDecoder->ld, LEN_D_ALIGN);
if ((cnt = faad_getbits(&hDecoder->ld, LEN_D_CNT)) == (1<<LEN_D_CNT)-1)
cnt += faad_getbits(&hDecoder->ld, LEN_D_ESC);
*dt_cnt = cnt;
if (align_flag)
faad_byte_align(&hDecoder->ld);
for (i=0; i<cnt; i++)
data_bytes[i] = faad_getbits(&hDecoder->ld, LEN_BYTE);
return 0;
}
int8_t AudioSpecificConfig2(uint8_t *pBuffer,
uint32_t buffer_size,
mp4AudioSpecificConfig *mp4ASC,
program_config *pce)
{
bitfile ld;
int8_t result = 0;
#ifdef SBR_DEC
int8_t bits_to_decode = 0;
#endif
if (pBuffer == NULL)
return -7;
if (mp4ASC == NULL)
return -8;
memset(mp4ASC, 0, sizeof(mp4AudioSpecificConfig));
faad_initbits(&ld, pBuffer, buffer_size);
faad_byte_align(&ld);
mp4ASC->objectTypeIndex = (uint8_t)faad_getbits(&ld, 5
DEBUGVAR(1,1,"parse_audio_decoder_specific_info(): ObjectTypeIndex"));
mp4ASC->samplingFrequencyIndex = (uint8_t)faad_getbits(&ld, 4
DEBUGVAR(1,2,"parse_audio_decoder_specific_info(): SamplingFrequencyIndex"));
mp4ASC->channelsConfiguration = (uint8_t)faad_getbits(&ld, 4
DEBUGVAR(1,3,"parse_audio_decoder_specific_info(): ChannelsConfiguration"));
mp4ASC->samplingFrequency = get_sample_rate(mp4ASC->samplingFrequencyIndex);
if (ObjectTypesTable[mp4ASC->objectTypeIndex] != 1)
{
faad_endbits(&ld);
return -1;
}
if (mp4ASC->samplingFrequency == 0)
{
faad_endbits(&ld);
return -2;
}
if (mp4ASC->channelsConfiguration > 7)
{
faad_endbits(&ld);
return -3;
}
#if (defined(PS_DEC) || defined(DRM_PS))
/* check if we have a mono file */
if (mp4ASC->channelsConfiguration == 1)
{
/* upMatrix to 2 channels for implicit signalling of PS */
mp4ASC->channelsConfiguration = 2;
}
#endif
#ifdef SBR_DEC
mp4ASC->sbr_present_flag = -1;
if (mp4ASC->objectTypeIndex == 5)
{
uint8_t tmp;
mp4ASC->sbr_present_flag = 1;
tmp = (uint8_t)faad_getbits(&ld, 4
DEBUGVAR(1,5,"parse_audio_decoder_specific_info(): extensionSamplingFrequencyIndex"));
/* check for downsampled SBR */
if (tmp == mp4ASC->samplingFrequencyIndex)
mp4ASC->downSampledSBR = 1;
mp4ASC->samplingFrequencyIndex = tmp;
if (mp4ASC->samplingFrequencyIndex == 15)
{
mp4ASC->samplingFrequency = (uint32_t)faad_getbits(&ld, 24
DEBUGVAR(1,6,"parse_audio_decoder_specific_info(): extensionSamplingFrequencyIndex"));
} else {
mp4ASC->samplingFrequency = get_sample_rate(mp4ASC->samplingFrequencyIndex);
}
mp4ASC->objectTypeIndex = (uint8_t)faad_getbits(&ld, 5
DEBUGVAR(1,7,"parse_audio_decoder_specific_info(): ObjectTypeIndex"));
}
#endif
/* get GASpecificConfig */
if (mp4ASC->objectTypeIndex == 1 || mp4ASC->objectTypeIndex == 2 ||
mp4ASC->objectTypeIndex == 3 || mp4ASC->objectTypeIndex == 4 ||
mp4ASC->objectTypeIndex == 6 || mp4ASC->objectTypeIndex == 7)
{
result = GASpecificConfig(&ld, mp4ASC, pce);
#ifdef ERROR_RESILIENCE
} else if (mp4ASC->objectTypeIndex >= ER_OBJECT_START) { /* ER */
result = GASpecificConfig(&ld, mp4ASC, pce);
mp4ASC->epConfig = (uint8_t)faad_getbits(&ld, 2
DEBUGVAR(1,143,"parse_audio_decoder_specific_info(): epConfig"));
if (mp4ASC->epConfig != 0)
result = -5;
#endif
} else {
result = -4;
}
#ifdef SSR_DEC
/* shorter frames not allowed for SSR */
if ((mp4ASC->objectTypeIndex == 4) && mp4ASC->frameLengthFlag)
return -6;
#endif
#ifdef SBR_DEC
bits_to_decode = (int8_t)(buffer_size*8 - faad_get_processed_bits(&ld));
if ((mp4ASC->objectTypeIndex != 5) && (bits_to_decode >= 16))
{
int16_t syncExtensionType = (int16_t)faad_getbits(&ld, 11
DEBUGVAR(1,9,"parse_audio_decoder_specific_info(): syncExtensionType"));
if (syncExtensionType == 0x2b7)
{
uint8_t tmp_OTi = (uint8_t)faad_getbits(&ld, 5
DEBUGVAR(1,10,"parse_audio_decoder_specific_info(): extensionAudioObjectType"));
if (mp4ASC->objectTypeIndex == 5)
{
mp4ASC->sbr_present_flag = (uint8_t)faad_get1bit(&ld
DEBUGVAR(1,11,"parse_audio_decoder_specific_info(): sbr_present_flag"));
if (mp4ASC->sbr_present_flag)
{
uint8_t tmp;
/* Don't set OT to SBR until checked that it is actually there */
mp4ASC->objectTypeIndex = tmp_OTi;
tmp = (uint8_t)faad_getbits(&ld, 4
DEBUGVAR(1,12,"parse_audio_decoder_specific_info(): extensionSamplingFrequencyIndex"));
/* check for downsampled SBR */
if (tmp == mp4ASC->samplingFrequencyIndex)
mp4ASC->downSampledSBR = 1;
mp4ASC->samplingFrequencyIndex = tmp;
if (mp4ASC->samplingFrequencyIndex == 15)
{
mp4ASC->samplingFrequency = (uint32_t)faad_getbits(&ld, 24
DEBUGVAR(1,13,"parse_audio_decoder_specific_info(): extensionSamplingFrequencyIndex"));
} else {
mp4ASC->samplingFrequency = get_sample_rate(mp4ASC->samplingFrequencyIndex);
}
}
}
}
}
/* no SBR signalled, this could mean either implicit signalling or no SBR in this file */
/* MPEG specification states: assume SBR on files with samplerate <= 24000 Hz */
if (mp4ASC->sbr_present_flag == -1)
{
if (mp4ASC->samplingFrequency <= 24000)
{
mp4ASC->samplingFrequency *= 2;
mp4ASC->forceUpSampling = 1;
} else /* > 24000*/ {
mp4ASC->downSampledSBR = 1;
}
}
#endif
faad_endbits(&ld);
return result;
}
