47 #define MAX_CHANNELS 64 48 #define MAX_ELEM_ID 16 50 #define TNS_MAX_ORDER 20 51 #define MAX_LTP_LONG_SFB 40 53 #define CLIP_AVOIDANCE_FACTOR 0.95f 92 #define IS_CODEBOOK_UNSIGNED(x) (((x) - 1) & 10) 146 #define MAX_PREDICTORS 672 148 #define SCALE_DIV_512 36 149 #define SCALE_ONE_POS 140
150 #define SCALE_MAX_POS 255
151 #define SCALE_MAX_DIFF 60
152 #define SCALE_DIFF_ZERO 60
154 #define POW_SF2_ZERO 200 156 #define NOISE_PRE 256 157 #define NOISE_PRE_BITS 9
158 #define NOISE_OFFSET 90
189 int predictor_reset_count[31];
254 int band_type_run_end[120];
int predictor_initialized
static void imdct_and_windowing(AACContext *ac, SingleChannelElement *sce)
Conduct IMDCT and windowing.
static void apply_ltp(AACContext *ac, SingleChannelElement *sce)
Apply the long term prediction.
Band types following are encoded differently from others.
This structure describes decoded (raw) audio or video data.
INTFLOAT * ret
PCM output.
int common_window
Set if channels share a common 'IndividualChannelStream' in bitstream.
static void update_ltp(AACContext *ac, SingleChannelElement *sce)
Update the LTP buffer for next frame.
static void vector_pow43(int *coefs, int len)
Dynamic Range Control - decoded from the bitstream but not processed further.
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Spectral data are scaled white noise not coded in the bitstream.
int band_incr
Number of DRC bands greater than 1 having DRC info.
int dmono_mode
0->not dmono, 1->use first channel, 2->use second channel
const uint16_t * swb_offset
table of offsets to the lowest spectral coefficient of a scalefactor band, sfb, for a particular wind...
uint8_t layout_map[MAX_ELEM_ID *4][3]
Output configuration under trial specified by an inband PCE.
CouplingPoint
The point during decoding at which channel coupling is applied.
int num_coupled
number of target elements
#define DECLARE_ALIGNED(n, t, v)
Declare a variable that is aligned in memory.
Scalefactor data are intensity stereo positions (in phase).
Output configuration set in a global header but not yet locked.
SpectralBandReplication sbr
Spectral Band Replication definitions and structures.
uint8_t max_sfb
number of scalefactor bands per group
static const uint8_t offset[127][2]
int num_swb
number of scalefactor window bands
int prog_ref_level
A reference level for the long-term program audio level for all channels combined.
Output configuration locked in place.
int warned_remapping_once
int predictor_reset_group
void ff_aacdec_init_mips(AACContext *c)
int pce_instance_tag
Indicates with which program the DRC info is associated.
static void windowing_and_mdct_ltp(AACContext *ac, INTFLOAT *out, INTFLOAT *in, IndividualChannelStream *ics)
Apply windowing and MDCT to obtain the spectral coefficient from the predicted sample by LTP...
int interpolation_scheme
Indicates the interpolation scheme used in the SBR QMF domain.
int force_dmono_mode
0->not dmono, 1->use first channel, 2->use second channel
int is_saved
Set if elements have stored overlap from previous frame.
int warned_num_aac_frames
Libavcodec external API header.
typedef void(RENAME(mix_any_func_type))
static void apply_tns(INTFLOAT coef_param[1024], TemporalNoiseShaping *tns, IndividualChannelStream *ics, int decode)
Decode Temporal Noise Shaping filter coefficients and apply all-pole filters; reference: 4...
main external API structure.
IndividualChannelStream ics
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi - 0x80) *(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi - 0x80) *(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(const int16_t *) pi >> 8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t, *(const int16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t, *(const int16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(const int32_t *) pi >> 24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t, *(const int32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t, *(const int32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(const float *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(const float *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(const float *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(const double *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(const double *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(const double *) pi *(1U<< 31)))) #define SET_CONV_FUNC_GROUP(ofmt, ifmt) static void set_generic_function(AudioConvert *ac) { } void ff_audio_convert_free(AudioConvert **ac) { if(! *ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);} AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enum AVSampleFormat out_fmt, enum AVSampleFormat in_fmt, int channels, int sample_rate, int apply_map) { AudioConvert *ac;int in_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) return NULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method !=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt) > 2) { ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc) { av_free(ac);return NULL;} return ac;} in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar) { ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar ? ac->channels :1;} else if(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;else ac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);return ac;} int ff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in) { int use_generic=1;int len=in->nb_samples;int p;if(ac->dc) { av_log(ac->avr, AV_LOG_TRACE, "%d samples - audio_convert: %s to %s (dithered)\", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));return ff_convert_dither(ac-> in
Describe the class of an AVClass context structure.
Spectral data are coded with an escape sequence.
const uint8_t * swb_sizes
table of scalefactor band sizes for a particular window
OCStatus
Output configuration status.
int ms_mode
Signals mid/side stereo flags coding mode (used by encoder)
Output configuration under trial specified by a frame header.
uint8_t is_mode
Set if any bands have been encoded using intensity stereo (used by encoder)
Scalefactor data are intensity stereo positions (out of phase).
DynamicRangeControl che_drc
Single Channel Element - used for both SCE and LFE elements.
Individual Channel Stream.
float clip_avoidance_factor
set if any window is near clipping to the necessary atennuation factor to avoid it ...
channel element - generic struct for SCE/CPE/CCE/LFE
static void subband_scale(int *dst, int *src, int scale, int offset, int len, void *log_context)
Scalefactors and spectral data are all zero.
Spectral Band Replication.
This and later band types encode two values (rather than four) with one code word.