diff options
Diffstat (limited to 'converter/other/fiasco/codec/coeff.c')
| -rw-r--r-- | converter/other/fiasco/codec/coeff.c | 194 |
1 files changed, 97 insertions, 97 deletions
diff --git a/converter/other/fiasco/codec/coeff.c b/converter/other/fiasco/codec/coeff.c index 6d33bad5..3a5a6a0a 100644 --- a/converter/other/fiasco/codec/coeff.c +++ b/converter/other/fiasco/codec/coeff.c @@ -1,8 +1,8 @@ /* - * coeff.c: Matching pursuit coefficients probability model + * coeff.c: Matching pursuit coefficients probability model + * + * Written by: Ullrich Hafner * - * Written by: Ullrich Hafner - * * This file is part of FIASCO (Fractal Image And Sequence COdec) * Copyright (C) 1994-2000 Ullrich Hafner */ @@ -28,9 +28,9 @@ /* * Coefficient model interface: * Implementing the coefficients model interface requires the - * following steps: + * following steps: * - Add a constructor that initializes the coeff_t structure - * - Allocate new model with default_alloc() + * - Allocate new model with default_alloc() * - Fill the c_array_t coeff_models[] array with constructor and name * - Write code for methods bits() and update() * - Either use default functions for remaining methods or override them @@ -38,21 +38,21 @@ */ /***************************************************************************** - uniform distribution coefficients model + uniform distribution coefficients model *****************************************************************************/ static coeff_t * alloc_uniform_coeff_model (rpf_t *rpf, rpf_t *dc_rpf, - unsigned min_level, unsigned max_level); + unsigned min_level, unsigned max_level); static void uniform_update (const real_t *used_coeff, const word_t *used_states, - unsigned level, coeff_t *coeff); + unsigned level, coeff_t *coeff); static real_t uniform_bits (const real_t *used_coeff, const word_t *used_states, - unsigned level, const coeff_t *coeff); + unsigned level, const coeff_t *coeff); /***************************************************************************** - default functions + default functions *****************************************************************************/ static void @@ -63,15 +63,15 @@ static void default_free (coeff_t *coeff); static coeff_t * default_alloc (rpf_t *rpf, rpf_t *dc_rpf, - unsigned min_level, unsigned max_level); + unsigned min_level, unsigned max_level); /***************************************************************************** - adaptive arithmetic coding model + adaptive arithmetic coding model *****************************************************************************/ static coeff_t * alloc_aac_coeff_model (rpf_t *rpf, rpf_t *dc_rpf, - unsigned min_level, unsigned max_level); + unsigned min_level, unsigned max_level); static void aac_model_free (void *model); static void * @@ -80,70 +80,70 @@ static void * aac_model_duplicate (const coeff_t *coeff, const void *model); static void aac_update (const real_t *used_coeff, const word_t *used_states, - unsigned level, coeff_t *coeff); + unsigned level, coeff_t *coeff); static real_t aac_bits (const real_t *used_coeff, const word_t *used_states, - unsigned level, const coeff_t *coeff); + unsigned level, const coeff_t *coeff); /***************************************************************************** - public code - + public code + *****************************************************************************/ typedef struct c_array { const char *identifier; coeff_t *(*function) (rpf_t *rpf, rpf_t *dc_rpf, - unsigned min_level, unsigned max_level); + unsigned min_level, unsigned max_level); } c_array_t; c_array_t coeff_models[] = {{"adaptive", alloc_aac_coeff_model}, - {"uniform", alloc_uniform_coeff_model}, - {NULL, NULL}}; + {"uniform", alloc_uniform_coeff_model}, + {NULL, NULL}}; coeff_t * alloc_coeff_model (const char *coeff_model_name, rpf_t *rpf, rpf_t *dc_rpf, - unsigned min_level, unsigned max_level) + unsigned min_level, unsigned max_level) /* * Allocate a new coefficients model which is identified by the string * 'coeff_model_name'. 'rpf' and 'dc_rpf' define the reduced * precision formats the should be used to quantize normal and DC * components, respectively. 'min_level' and 'max_level' define the * range of range approximations. - * + * * Return value: - * pointer to the allocated coefficients model + * pointer to the allocated coefficients model * * Note: * Refer to 'coeff.h' for a short description of the member functions. */ { unsigned n; - + for (n = 0; coeff_models [n].identifier; n++) /* step through all id's */ - if (strcaseeq (coeff_models [n].identifier, coeff_model_name)) - return coeff_models [n].function (rpf, dc_rpf, min_level, max_level); + if (strcaseeq (coeff_models [n].identifier, coeff_model_name)) + return coeff_models [n].function (rpf, dc_rpf, min_level, max_level); warning ("Can't initialize coefficients model '%s'. " - "Using default value '%s'.", - coeff_model_name, coeff_models [0].identifier); + "Using default value '%s'.", + coeff_model_name, coeff_models [0].identifier); return coeff_models [0].function (rpf, dc_rpf, min_level, max_level); } /***************************************************************************** - private code - + private code + *****************************************************************************/ /***************************************************************************** - uniform distribution coefficients model + uniform distribution coefficients model *****************************************************************************/ static coeff_t * alloc_uniform_coeff_model (rpf_t *rpf, rpf_t *dc_rpf, - unsigned min_level, unsigned max_level) + unsigned min_level, unsigned max_level) /* * Underlying probability model: uniform distribution. * I.e. each coefficient is written as such with @@ -154,21 +154,21 @@ alloc_uniform_coeff_model (rpf_t *rpf, rpf_t *dc_rpf, coeff->bits = uniform_bits; coeff->update = uniform_update; - + return coeff; } static real_t uniform_bits (const real_t *used_coeff, const word_t *used_states, - unsigned level, const coeff_t *coeff) + unsigned level, const coeff_t *coeff) { unsigned edge; - real_t bits = 0; /* #bits to store coefficients */ - + real_t bits = 0; /* #bits to store coefficients */ + for (edge = 0; isedge (used_states [edge]); edge++) { rpf_t *rpf = used_states [edge] ? coeff->rpf : coeff->dc_rpf; - + bits += rpf->mantissa_bits + 1; } @@ -177,13 +177,13 @@ uniform_bits (const real_t *used_coeff, const word_t *used_states, static void uniform_update (const real_t *used_coeff, const word_t *used_states, - unsigned level, coeff_t *coeff) + unsigned level, coeff_t *coeff) { - return; /* nothing to do */ + return; /* nothing to do */ } /***************************************************************************** - adaptive arithmetic coding model + adaptive arithmetic coding model *****************************************************************************/ typedef struct aac_model @@ -194,74 +194,74 @@ typedef struct aac_model static coeff_t * alloc_aac_coeff_model (rpf_t *rpf, rpf_t *dc_rpf, - unsigned min_level, unsigned max_level) + unsigned min_level, unsigned max_level) /* * Underlying probability model: adaptive arithmetic coding using * the level of a range as context. */ { coeff_t *coeff = default_alloc (rpf, dc_rpf, min_level, max_level); - + coeff->bits = aac_bits; coeff->update = aac_update; coeff->model_free = aac_model_free; coeff->model_duplicate = aac_model_duplicate; - coeff->model = aac_model_alloc (coeff); - + coeff->model = aac_model_alloc (coeff); + return coeff; } static real_t aac_bits (const real_t *used_coeff, const word_t *used_states, - unsigned level, const coeff_t *coeff) + unsigned level, const coeff_t *coeff) { - real_t bits = 0; /* # bits to store coefficients */ - unsigned edge; - int state; + real_t bits = 0; /* # bits to store coefficients */ + unsigned edge; + int state; word_t *counts; aac_model_t *model = (aac_model_t *) coeff->model; counts = model->counts - + (1 << (1 + coeff->dc_rpf->mantissa_bits)) - + ((level - coeff->min_level) - * (1 << (1 + coeff->rpf->mantissa_bits))); - + + (1 << (1 + coeff->dc_rpf->mantissa_bits)) + + ((level - coeff->min_level) + * (1 << (1 + coeff->rpf->mantissa_bits))); + for (edge = 0; isedge (state = used_states [edge]); edge++) if (state) - bits -= log2 (counts [rtob (used_coeff [edge], coeff->rpf)] - / (real_t) model->totals [level - - coeff->min_level + 1]); + bits -= log2 (counts [rtob (used_coeff [edge], coeff->rpf)] + / (real_t) model->totals [level + - coeff->min_level + 1]); else - bits -= log2 (model->counts [rtob (used_coeff [edge], coeff->dc_rpf)] - / (real_t) model->totals [0]); - + bits -= log2 (model->counts [rtob (used_coeff [edge], coeff->dc_rpf)] + / (real_t) model->totals [0]); + return bits; } static void aac_update (const real_t *used_coeff, const word_t *used_states, - unsigned level, coeff_t *coeff) + unsigned level, coeff_t *coeff) { - unsigned edge; - int state; + unsigned edge; + int state; word_t *counts; aac_model_t *model = (aac_model_t *) coeff->model; counts = model->counts - + (1 << (1 + coeff->dc_rpf->mantissa_bits)) - + ((level - coeff->min_level) - * (1 << (1 + coeff->rpf->mantissa_bits))); + + (1 << (1 + coeff->dc_rpf->mantissa_bits)) + + ((level - coeff->min_level) + * (1 << (1 + coeff->rpf->mantissa_bits))); for (edge = 0; isedge (state = used_states [edge]); edge++) if (state) { - counts [rtob (used_coeff [edge], coeff->rpf)]++; - model->totals [level - coeff->min_level + 1]++; + counts [rtob (used_coeff [edge], coeff->rpf)]++; + model->totals [level - coeff->min_level + 1]++; } else { - model->counts [rtob (used_coeff [edge], coeff->dc_rpf)]++; - model->totals [0]++; + model->counts [rtob (used_coeff [edge], coeff->dc_rpf)]++; + model->totals [0]++; } } @@ -272,12 +272,12 @@ aac_model_duplicate (const coeff_t *coeff, const void *model) aac_model_t *dst = aac_model_alloc (coeff); memcpy (dst->counts, src->counts, - sizeof (word_t) * ((coeff->max_level - coeff->min_level + 1) - * (1 << (1 + coeff->rpf->mantissa_bits)) - + (1 << (1 + coeff->dc_rpf->mantissa_bits)))); + sizeof (word_t) * ((coeff->max_level - coeff->min_level + 1) + * (1 << (1 + coeff->rpf->mantissa_bits)) + + (1 << (1 + coeff->dc_rpf->mantissa_bits)))); memcpy (dst->totals, src->totals, - sizeof (word_t) * (coeff->max_level - coeff->min_level + 1 + 1)); - + sizeof (word_t) * (coeff->max_level - coeff->min_level + 1 + 1)); + return dst; } @@ -285,36 +285,36 @@ static void * aac_model_alloc (const coeff_t *coeff) { aac_model_t *model; - unsigned size = (coeff->max_level - coeff->min_level + 1) - * (1 << (1 + coeff->rpf->mantissa_bits)) - + (1 << (1 + coeff->dc_rpf->mantissa_bits)); - - model = Calloc (1, sizeof (aac_model_t)); + unsigned size = (coeff->max_level - coeff->min_level + 1) + * (1 << (1 + coeff->rpf->mantissa_bits)) + + (1 << (1 + coeff->dc_rpf->mantissa_bits)); + + model = Calloc (1, sizeof (aac_model_t)); model->counts = Calloc (size, sizeof (word_t)); model->totals = Calloc (coeff->max_level - coeff->min_level + 1 + 1, - sizeof (word_t)); + sizeof (word_t)); /* * Initialize model */ { unsigned n; word_t *ptr = model->counts; - + for (n = size; n; n--) - *ptr++ = 1; + *ptr++ = 1; model->totals [0] = 1 << (1 + coeff->dc_rpf->mantissa_bits); for (n = coeff->min_level; n <= coeff->max_level; n++) - model->totals [n - coeff->min_level + 1] - = 1 << (1 + coeff->rpf->mantissa_bits); + model->totals [n - coeff->min_level + 1] + = 1 << (1 + coeff->rpf->mantissa_bits); } - + return (void *) model; } static void aac_model_free (void *model) { - aac_model_t *aac_model = (aac_model_t *) model; + aac_model_t *aac_model = (aac_model_t *) model; if (aac_model) { @@ -325,26 +325,26 @@ aac_model_free (void *model) } /***************************************************************************** - default functions + default functions *****************************************************************************/ static coeff_t * default_alloc (rpf_t *rpf, rpf_t *dc_rpf, - unsigned min_level, unsigned max_level) + unsigned min_level, unsigned max_level) { coeff_t *coeff = Calloc (1, sizeof (coeff_t)); - coeff->rpf = rpf; - coeff->dc_rpf = dc_rpf; - coeff->min_level = min_level; - coeff->max_level = max_level; - coeff->model = NULL; - coeff->bits = NULL; - coeff->update = NULL; - coeff->free = default_free; - coeff->model_free = default_model_free; + coeff->rpf = rpf; + coeff->dc_rpf = dc_rpf; + coeff->min_level = min_level; + coeff->max_level = max_level; + coeff->model = NULL; + coeff->bits = NULL; + coeff->update = NULL; + coeff->free = default_free; + coeff->model_free = default_model_free; coeff->model_duplicate = default_model_duplicate; - + return coeff; } |