62 #define FFT_FIXED_32 1
102 ps->
var0.mant = 0x20000000;
104 ps->
var1.mant = 0x20000000;
108 static const int exp2tab[4] = {
Q31(1.0000000000/2),
Q31(1.1892071150/2),
Q31(1.4142135624/2),
Q31(1.6817928305/2) };
112 dst[0] = (idx & 15) - 4;
113 dst[1] = (idx >> 4 & 15) - 4;
120 dst[0] = (idx & 3) - 1;
121 dst[1] = (idx >> 2 & 3) - 1;
122 dst[2] = (idx >> 4 & 3) - 1;
123 dst[3] = (idx >> 6 & 3) - 1;
128 static inline int *
DEC_UPAIR(
int *dst,
unsigned idx,
unsigned sign)
130 dst[0] = (idx & 15) * (1 - (sign & 0xFFFFFFFE));
131 dst[1] = (idx >> 4 & 15) * (1 - ((sign & 1) * 2));
136 static inline int *
DEC_UQUAD(
int *dst,
unsigned idx,
unsigned sign)
138 unsigned nz = idx >> 12;
140 dst[0] = (idx & 3) * (1 + (((
int)sign >> 31) * 2));
143 dst[1] = (idx >> 2 & 3) * (1 + (((
int)sign >> 31) * 2));
146 dst[2] = (idx >> 4 & 3) * (1 + (((
int)sign >> 31) * 2));
149 dst[3] = (idx >> 6 & 3) * (1 + (((
int)sign >> 31) * 2));
170 int ssign = scale < 0 ? -1 : 1;
187 }
else if (
s > -32) {
192 dst[
i] =
out * (unsigned)ssign;
207 while (band_energy > 0x7fff) {
212 s = 21 + nlz - (
s >> 2);
221 out = (
int)(((int64_t)coefs[
i] *
c) >> 32);
235 coefs[
i] = -(int64_t)coefs[
i] *
c * (1 << -
s);
248 tmp.mant = (
tmp.mant + 0x00200000U) & 0xFFC00000U;
262 tmp.mant = (
tmp.mant + 0x001FFFFFU + (
tmp.mant & 0x00400000U >> 16)) & 0xFFC00000U;
295 if (var0.
exp > 1 || (var0.
exp == 1 && var0.
mant > 0x20000000)) {
303 if (var1.exp > 1 || (var1.exp == 1 && var1.mant > 0x20000000)) {
318 *coef += (unsigned)((
pv.mant + (1 << (
shift - 1))) >>
shift);
320 *coef += (unsigned)
pv.mant << -
shift;
363 int *dest = target->
coeffs;
365 int g,
i, group, k, idx = 0;
368 "Dependent coupling is not supported together with LTP\n");
379 shift = (-gain-1024) >> 3;
383 shift = (gain-1024) >> 3;
388 }
else if (
shift < 0) {
392 for (group = 0; group < ics->
group_len[
g]; group++) {
394 tmp = (
int)(((int64_t)
src[group * 128 + k] *
c + \
395 (int64_t)0x1000000000) >> 37);
401 for (group = 0; group < ics->
group_len[
g]; group++) {
403 tmp = (
int)(((int64_t)
src[group * 128 + k] *
c + \
404 (int64_t)0x1000000000) >> 37);
405 dest[group * 128 + k] +=
tmp * (1U <<
shift);
428 unsigned int *dest = target->
ret;
432 shift = (gain-1024) >> 3;
435 }
else if (
shift < 0) {
439 for (
i = 0;
i <
len;
i++) {
440 tmp = (
int)(((int64_t)
src[
i] *
c + (int64_t)0x1000000000) >> 37);
445 for (
i = 0;
i <
len;
i++) {
446 tmp = (
int)(((int64_t)
src[
i] *
c + (int64_t)0x1000000000) >> 37);
@ ZERO_BT
Scalefactors and spectral data are all zero.
static void subband_scale(int *dst, int *src, int scale, int offset, int len, void *log_context)
AVCodec ff_aac_fixed_decoder
static av_always_inline void reset_predict_state(PredictorState *ps)
static av_always_inline SoftFloat flt16_round(SoftFloat pf)
static int * DEC_UQUAD(int *dst, unsigned idx, unsigned sign)
static av_always_inline void predict(PredictorState *ps, int *coef, int output_enable)
static void apply_independent_coupling_fixed(AACContext *ac, SingleChannelElement *target, ChannelElement *cce, int index)
Apply independent channel coupling (applied after IMDCT).
static const int exp2tab[4]
static const int cce_scale_fixed[8]
static int * DEC_SQUAD(int *dst, unsigned idx)
static av_always_inline SoftFloat flt16_even(SoftFloat pf)
static av_always_inline SoftFloat flt16_trunc(SoftFloat pf)
static int * DEC_SPAIR(int *dst, unsigned idx)
static void apply_dependent_coupling_fixed(AACContext *ac, SingleChannelElement *target, ChannelElement *cce, int index)
Apply dependent channel coupling (applied before IMDCT).
static void vector_pow43(int *coefs, int len)
static int * DEC_UPAIR(int *dst, unsigned idx, unsigned sign)
static void noise_scale(int *coefs, int scale, int band_energy, int len)
static int aac_decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)
static av_cold int aac_decode_close(AVCodecContext *avctx)
static av_cold int aac_decode_init(AVCodecContext *avctx)
static void flush(AVCodecContext *avctx)
static const uint64_t aac_channel_layout[16]
AAC Spectral Band Replication function declarations.
static enum AVSampleFormat sample_fmts[]
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Libavcodec external API header.
static av_cold int init(AVCodecContext *avctx)
uint32_t ff_cbrt_tab_fixed[1<< 13]
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
bitstream reader API header.
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
#define AV_CODEC_CAP_CHANNEL_CONF
Codec should fill in channel configuration and samplerate instead of container.
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
#define DECLARE_ALIGNED(n, t, v)
Declare a variable that is aligned in memory.
AVSampleFormat
Audio sample formats.
@ AV_SAMPLE_FMT_S32P
signed 32 bits, planar
static const int offsets[]
static const int16_t alpha[]
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
#define FF_CODEC_CAP_INIT_CLEANUP
The codec allows calling the close function for deallocation even if the init function returned a fai...
common internal API header
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
static av_always_inline av_const double round(double x)
@ AOT_AAC_LTP
Y Long Term Prediction.
const AVProfile ff_aac_profiles[]
Spectral Band Replication definitions and structures.
static av_const SoftFloat av_add_sf(SoftFloat a, SoftFloat b)
static av_const SoftFloat av_sub_sf(SoftFloat a, SoftFloat b)
static av_const SoftFloat av_div_sf(SoftFloat a, SoftFloat b)
b has to be normalized and not zero.
static av_const SoftFloat av_mul_sf(SoftFloat a, SoftFloat b)
static av_const SoftFloat av_int2sf(int v, int frac_bits)
Converts a mantisse and exponent to a SoftFloat.
static int shift(int a, int b)
OutputConfiguration oc[2]
const char * name
Name of the codec implementation.
channel element - generic struct for SCE/CPE/CCE/LFE
SingleChannelElement ch[2]
Individual Channel Stream.
uint8_t max_sfb
number of scalefactor bands per group
const uint16_t * swb_offset
table of offsets to the lowest spectral coefficient of a scalefactor band, sfb, for a particular wind...
int sbr
-1 implicit, 1 presence
Single Channel Element - used for both SCE and LFE elements.
INTFLOAT * ret
PCM output.
enum BandType band_type[128]
band types
INTFLOAT coeffs[1024]
coefficients for IMDCT, maybe processed
IndividualChannelStream ics
static const uint8_t offset[127][2]