diff options
author | Nathan Caldwell <saintdev@gmail.com> | 2010-08-23 23:27:24 +0400 |
---|---|---|
committer | Alex Converse <alex.converse@gmail.com> | 2010-08-23 23:27:24 +0400 |
commit | af00dddeca58df2993effb162bd5fd9a715d57d3 (patch) | |
tree | 51da27a1b37f5e1388a369f0b450bace69a0980f | |
parent | 078ae66b4b982ae249b4000aaaff90b7facbdbce (diff) |
aacenc: Rename Psy3gpp* structs to AacPsy*
This allows cleaner implementation of other psymodels using the existing
structs. It also will make it easier to interchange individual parts of
the psymodel to create hybrid models.
Patch by: Nathan Caldwell <saintdev@gmail.com>
Originally committed as revision 24890 to svn://svn.ffmpeg.org/ffmpeg/trunk
-rw-r--r-- | libavcodec/aacpsy.c | 50 | ||||
-rw-r--r-- | libavcodec/fft.h | 2 |
2 files changed, 26 insertions, 26 deletions
diff --git a/libavcodec/aacpsy.c b/libavcodec/aacpsy.c index 19914c9781..1d06f1800b 100644 --- a/libavcodec/aacpsy.c +++ b/libavcodec/aacpsy.c @@ -51,44 +51,44 @@ /** * information for single band used by 3GPP TS26.403-inspired psychoacoustic model */ -typedef struct Psy3gppBand{ +typedef struct AacPsyBand{ float energy; ///< band energy float ffac; ///< form factor float thr; ///< energy threshold float min_snr; ///< minimal SNR float thr_quiet; ///< threshold in quiet -}Psy3gppBand; +}AacPsyBand; /** * single/pair channel context for psychoacoustic model */ -typedef struct Psy3gppChannel{ - Psy3gppBand band[128]; ///< bands information - Psy3gppBand prev_band[128]; ///< bands information from the previous frame +typedef struct AacPsyChannel{ + AacPsyBand band[128]; ///< bands information + AacPsyBand prev_band[128]; ///< bands information from the previous frame float win_energy; ///< sliding average of channel energy float iir_state[2]; ///< hi-pass IIR filter state uint8_t next_grouping; ///< stored grouping scheme for the next frame (in case of 8 short window sequence) enum WindowSequence next_window_seq; ///< window sequence to be used in the next frame -}Psy3gppChannel; +}AacPsyChannel; /** * psychoacoustic model frame type-dependent coefficients */ -typedef struct Psy3gppCoeffs{ +typedef struct AacPsyCoeffs{ float ath [64]; ///< absolute threshold of hearing per bands float barks [64]; ///< Bark value for each spectral band in long frame float spread_low[64]; ///< spreading factor for low-to-high threshold spreading in long frame float spread_hi [64]; ///< spreading factor for high-to-low threshold spreading in long frame -}Psy3gppCoeffs; +}AacPsyCoeffs; /** * 3GPP TS26.403-inspired psychoacoustic model specific data */ -typedef struct Psy3gppContext{ - Psy3gppCoeffs psy_coef[2]; - Psy3gppChannel *ch; -}Psy3gppContext; +typedef struct AacPsyContext{ + AacPsyCoeffs psy_coef[2]; + AacPsyChannel *ch; +}AacPsyContext; /** * Calculate Bark value for given line. @@ -113,17 +113,17 @@ static av_cold float ath(float f, float add) } static av_cold int psy_3gpp_init(FFPsyContext *ctx) { - Psy3gppContext *pctx; + AacPsyContext *pctx; float bark; int i, j, g, start; float prev, minscale, minath; - ctx->model_priv_data = av_mallocz(sizeof(Psy3gppContext)); - pctx = (Psy3gppContext*) ctx->model_priv_data; + ctx->model_priv_data = av_mallocz(sizeof(AacPsyContext)); + pctx = (AacPsyContext*) ctx->model_priv_data; minath = ath(3410, ATH_ADD); for (j = 0; j < 2; j++) { - Psy3gppCoeffs *coeffs = &pctx->psy_coef[j]; + AacPsyCoeffs *coeffs = &pctx->psy_coef[j]; float line_to_frequency = ctx->avctx->sample_rate / (j ? 256.f : 2048.0f); i = 0; prev = 0.0; @@ -147,7 +147,7 @@ static av_cold int psy_3gpp_init(FFPsyContext *ctx) { } } - pctx->ch = av_mallocz(sizeof(Psy3gppChannel) * ctx->avctx->channels); + pctx->ch = av_mallocz(sizeof(AacPsyChannel) * ctx->avctx->channels); return 0; } @@ -182,8 +182,8 @@ static FFPsyWindowInfo psy_3gpp_window(FFPsyContext *ctx, int i, j; int br = ctx->avctx->bit_rate / ctx->avctx->channels; int attack_ratio = br <= 16000 ? 18 : 10; - Psy3gppContext *pctx = (Psy3gppContext*) ctx->model_priv_data; - Psy3gppChannel *pch = &pctx->ch[channel]; + AacPsyContext *pctx = (AacPsyContext*) ctx->model_priv_data; + AacPsyChannel *pch = &pctx->ch[channel]; uint8_t grouping = 0; int next_type = pch->next_window_seq; FFPsyWindowInfo wi; @@ -266,18 +266,18 @@ static FFPsyWindowInfo psy_3gpp_window(FFPsyContext *ctx, static void psy_3gpp_analyze(FFPsyContext *ctx, int channel, const float *coefs, FFPsyWindowInfo *wi) { - Psy3gppContext *pctx = (Psy3gppContext*) ctx->model_priv_data; - Psy3gppChannel *pch = &pctx->ch[channel]; + AacPsyContext *pctx = (AacPsyContext*) ctx->model_priv_data; + AacPsyChannel *pch = &pctx->ch[channel]; int start = 0; int i, w, g; const int num_bands = ctx->num_bands[wi->num_windows == 8]; const uint8_t* band_sizes = ctx->bands[wi->num_windows == 8]; - Psy3gppCoeffs *coeffs = &pctx->psy_coef[wi->num_windows == 8]; + AacPsyCoeffs *coeffs = &pctx->psy_coef[wi->num_windows == 8]; //calculate energies, initial thresholds and related values - 5.4.2 "Threshold Calculation" for (w = 0; w < wi->num_windows*16; w += 16) { for (g = 0; g < num_bands; g++) { - Psy3gppBand *band = &pch->band[w+g]; + AacPsyBand *band = &pch->band[w+g]; band->energy = 0.0f; for (i = 0; i < band_sizes[g]; i++) band->energy += coefs[start+i] * coefs[start+i]; @@ -290,7 +290,7 @@ static void psy_3gpp_analyze(FFPsyContext *ctx, int channel, } //modify thresholds - spread, threshold in quiet - 5.4.3 "Spreaded Energy Calculation" for (w = 0; w < wi->num_windows*16; w += 16) { - Psy3gppBand *band = &pch->band[w]; + AacPsyBand *band = &pch->band[w]; for (g = 1; g < num_bands; g++) band[g].thr = FFMAX(band[g].thr, band[g-1].thr * coeffs->spread_low[g-1]); for (g = num_bands - 2; g >= 0; g--) @@ -311,7 +311,7 @@ static void psy_3gpp_analyze(FFPsyContext *ctx, int channel, static av_cold void psy_3gpp_end(FFPsyContext *apc) { - Psy3gppContext *pctx = (Psy3gppContext*) apc->model_priv_data; + AacPsyContext *pctx = (AacPsyContext*) apc->model_priv_data; av_freep(&pctx->ch); av_freep(&apc->model_priv_data); } diff --git a/libavcodec/fft.h b/libavcodec/fft.h index eb6714fe95..030222664c 100644 --- a/libavcodec/fft.h +++ b/libavcodec/fft.h @@ -35,7 +35,7 @@ struct FFTContext { uint16_t *revtab; FFTComplex *tmp_buf; int mdct_size; /* size of MDCT (i.e. number of input data * 2) */ - int mdct_bits; /* n = 2^nbits */ + int mdct_bits; /* n = 2^mdct_bits */ /* pre/post rotation tables */ FFTSample *tcos; FFTSample *tsin; |