uint8_t rvlc_decode_scale_factors(ic_stream *ics, bitfile *ld)
{
uint8_t result;
uint8_t intensity_used = 0;
uint8_t *rvlc_sf_buffer = NULL;
uint8_t *rvlc_esc_buffer = NULL;
bitfile ld_rvlc_sf, ld_rvlc_esc;
// bitfile ld_rvlc_sf_rev, ld_rvlc_esc_rev;
if (ics->length_of_rvlc_sf > 0)
{
/* We read length_of_rvlc_sf bits here to put it in a
seperate bitfile.
*/
rvlc_sf_buffer = faad_getbitbuffer(ld, ics->length_of_rvlc_sf
DEBUGVAR(1,156,"rvlc_decode_scale_factors(): bitbuffer: length_of_rvlc_sf"));
faad_initbits(&ld_rvlc_sf, (void*)rvlc_sf_buffer, bit2byte(ics->length_of_rvlc_sf));
// faad_initbits_rev(&ld_rvlc_sf_rev, (void*)rvlc_sf_buffer,
// ics->length_of_rvlc_sf);
}
if (ics->sf_escapes_present)
{
/* We read length_of_rvlc_escapes bits here to put it in a
seperate bitfile.
*/
rvlc_esc_buffer = faad_getbitbuffer(ld, ics->length_of_rvlc_escapes
DEBUGVAR(1,157,"rvlc_decode_scale_factors(): bitbuffer: length_of_rvlc_escapes"));
faad_initbits(&ld_rvlc_esc, (void*)rvlc_esc_buffer, bit2byte(ics->length_of_rvlc_escapes));
// faad_initbits_rev(&ld_rvlc_esc_rev, (void*)rvlc_esc_buffer,
// ics->length_of_rvlc_escapes);
}
/* decode the rvlc scale factors and escapes */
result = rvlc_decode_sf_forward(ics, &ld_rvlc_sf,
&ld_rvlc_esc, &intensity_used);
// result = rvlc_decode_sf_reverse(ics, &ld_rvlc_sf_rev,
// &ld_rvlc_esc_rev, intensity_used);
if (rvlc_esc_buffer) faad_free(rvlc_esc_buffer);
if (rvlc_sf_buffer) faad_free(rvlc_sf_buffer);
if (ics->length_of_rvlc_sf > 0)
faad_endbits(&ld_rvlc_sf);
if (ics->sf_escapes_present)
faad_endbits(&ld_rvlc_esc);
return result;
}
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;
}
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;
}
