mirror of
https://github.com/xenia-project/FFmpeg.git
synced 2024-12-05 01:56:41 +00:00
2912e87a6c
Signed-off-by: Mans Rullgard <mans@mansr.com>
900 lines
27 KiB
C
900 lines
27 KiB
C
/*
|
|
* Monkey's Audio lossless audio decoder
|
|
* Copyright (c) 2007 Benjamin Zores <ben@geexbox.org>
|
|
* based upon libdemac from Dave Chapman.
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#define ALT_BITSTREAM_READER_LE
|
|
#include "avcodec.h"
|
|
#include "dsputil.h"
|
|
#include "get_bits.h"
|
|
#include "bytestream.h"
|
|
#include "libavutil/audioconvert.h"
|
|
|
|
/**
|
|
* @file
|
|
* Monkey's Audio lossless audio decoder
|
|
*/
|
|
|
|
#define BLOCKS_PER_LOOP 4608
|
|
#define MAX_CHANNELS 2
|
|
#define MAX_BYTESPERSAMPLE 3
|
|
|
|
#define APE_FRAMECODE_MONO_SILENCE 1
|
|
#define APE_FRAMECODE_STEREO_SILENCE 3
|
|
#define APE_FRAMECODE_PSEUDO_STEREO 4
|
|
|
|
#define HISTORY_SIZE 512
|
|
#define PREDICTOR_ORDER 8
|
|
/** Total size of all predictor histories */
|
|
#define PREDICTOR_SIZE 50
|
|
|
|
#define YDELAYA (18 + PREDICTOR_ORDER*4)
|
|
#define YDELAYB (18 + PREDICTOR_ORDER*3)
|
|
#define XDELAYA (18 + PREDICTOR_ORDER*2)
|
|
#define XDELAYB (18 + PREDICTOR_ORDER)
|
|
|
|
#define YADAPTCOEFFSA 18
|
|
#define XADAPTCOEFFSA 14
|
|
#define YADAPTCOEFFSB 10
|
|
#define XADAPTCOEFFSB 5
|
|
|
|
/**
|
|
* Possible compression levels
|
|
* @{
|
|
*/
|
|
enum APECompressionLevel {
|
|
COMPRESSION_LEVEL_FAST = 1000,
|
|
COMPRESSION_LEVEL_NORMAL = 2000,
|
|
COMPRESSION_LEVEL_HIGH = 3000,
|
|
COMPRESSION_LEVEL_EXTRA_HIGH = 4000,
|
|
COMPRESSION_LEVEL_INSANE = 5000
|
|
};
|
|
/** @} */
|
|
|
|
#define APE_FILTER_LEVELS 3
|
|
|
|
/** Filter orders depending on compression level */
|
|
static const uint16_t ape_filter_orders[5][APE_FILTER_LEVELS] = {
|
|
{ 0, 0, 0 },
|
|
{ 16, 0, 0 },
|
|
{ 64, 0, 0 },
|
|
{ 32, 256, 0 },
|
|
{ 16, 256, 1280 }
|
|
};
|
|
|
|
/** Filter fraction bits depending on compression level */
|
|
static const uint8_t ape_filter_fracbits[5][APE_FILTER_LEVELS] = {
|
|
{ 0, 0, 0 },
|
|
{ 11, 0, 0 },
|
|
{ 11, 0, 0 },
|
|
{ 10, 13, 0 },
|
|
{ 11, 13, 15 }
|
|
};
|
|
|
|
|
|
/** Filters applied to the decoded data */
|
|
typedef struct APEFilter {
|
|
int16_t *coeffs; ///< actual coefficients used in filtering
|
|
int16_t *adaptcoeffs; ///< adaptive filter coefficients used for correcting of actual filter coefficients
|
|
int16_t *historybuffer; ///< filter memory
|
|
int16_t *delay; ///< filtered values
|
|
|
|
int avg;
|
|
} APEFilter;
|
|
|
|
typedef struct APERice {
|
|
uint32_t k;
|
|
uint32_t ksum;
|
|
} APERice;
|
|
|
|
typedef struct APERangecoder {
|
|
uint32_t low; ///< low end of interval
|
|
uint32_t range; ///< length of interval
|
|
uint32_t help; ///< bytes_to_follow resp. intermediate value
|
|
unsigned int buffer; ///< buffer for input/output
|
|
} APERangecoder;
|
|
|
|
/** Filter histories */
|
|
typedef struct APEPredictor {
|
|
int32_t *buf;
|
|
|
|
int32_t lastA[2];
|
|
|
|
int32_t filterA[2];
|
|
int32_t filterB[2];
|
|
|
|
int32_t coeffsA[2][4]; ///< adaption coefficients
|
|
int32_t coeffsB[2][5]; ///< adaption coefficients
|
|
int32_t historybuffer[HISTORY_SIZE + PREDICTOR_SIZE];
|
|
} APEPredictor;
|
|
|
|
/** Decoder context */
|
|
typedef struct APEContext {
|
|
AVCodecContext *avctx;
|
|
DSPContext dsp;
|
|
int channels;
|
|
int samples; ///< samples left to decode in current frame
|
|
|
|
int fileversion; ///< codec version, very important in decoding process
|
|
int compression_level; ///< compression levels
|
|
int fset; ///< which filter set to use (calculated from compression level)
|
|
int flags; ///< global decoder flags
|
|
|
|
uint32_t CRC; ///< frame CRC
|
|
int frameflags; ///< frame flags
|
|
int currentframeblocks; ///< samples (per channel) in current frame
|
|
int blocksdecoded; ///< count of decoded samples in current frame
|
|
APEPredictor predictor; ///< predictor used for final reconstruction
|
|
|
|
int32_t decoded0[BLOCKS_PER_LOOP]; ///< decoded data for the first channel
|
|
int32_t decoded1[BLOCKS_PER_LOOP]; ///< decoded data for the second channel
|
|
|
|
int16_t* filterbuf[APE_FILTER_LEVELS]; ///< filter memory
|
|
|
|
APERangecoder rc; ///< rangecoder used to decode actual values
|
|
APERice riceX; ///< rice code parameters for the second channel
|
|
APERice riceY; ///< rice code parameters for the first channel
|
|
APEFilter filters[APE_FILTER_LEVELS][2]; ///< filters used for reconstruction
|
|
|
|
uint8_t *data; ///< current frame data
|
|
uint8_t *data_end; ///< frame data end
|
|
const uint8_t *ptr; ///< current position in frame data
|
|
const uint8_t *last_ptr; ///< position where last 4608-sample block ended
|
|
|
|
int error;
|
|
} APEContext;
|
|
|
|
// TODO: dsputilize
|
|
|
|
static av_cold int ape_decode_init(AVCodecContext * avctx)
|
|
{
|
|
APEContext *s = avctx->priv_data;
|
|
int i;
|
|
|
|
if (avctx->extradata_size != 6) {
|
|
av_log(avctx, AV_LOG_ERROR, "Incorrect extradata\n");
|
|
return -1;
|
|
}
|
|
if (avctx->bits_per_coded_sample != 16) {
|
|
av_log(avctx, AV_LOG_ERROR, "Only 16-bit samples are supported\n");
|
|
return -1;
|
|
}
|
|
if (avctx->channels > 2) {
|
|
av_log(avctx, AV_LOG_ERROR, "Only mono and stereo is supported\n");
|
|
return -1;
|
|
}
|
|
s->avctx = avctx;
|
|
s->channels = avctx->channels;
|
|
s->fileversion = AV_RL16(avctx->extradata);
|
|
s->compression_level = AV_RL16(avctx->extradata + 2);
|
|
s->flags = AV_RL16(avctx->extradata + 4);
|
|
|
|
av_log(avctx, AV_LOG_DEBUG, "Compression Level: %d - Flags: %d\n", s->compression_level, s->flags);
|
|
if (s->compression_level % 1000 || s->compression_level > COMPRESSION_LEVEL_INSANE) {
|
|
av_log(avctx, AV_LOG_ERROR, "Incorrect compression level %d\n", s->compression_level);
|
|
return -1;
|
|
}
|
|
s->fset = s->compression_level / 1000 - 1;
|
|
for (i = 0; i < APE_FILTER_LEVELS; i++) {
|
|
if (!ape_filter_orders[s->fset][i])
|
|
break;
|
|
s->filterbuf[i] = av_malloc((ape_filter_orders[s->fset][i] * 3 + HISTORY_SIZE) * 4);
|
|
}
|
|
|
|
dsputil_init(&s->dsp, avctx);
|
|
avctx->sample_fmt = AV_SAMPLE_FMT_S16;
|
|
avctx->channel_layout = (avctx->channels==2) ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO;
|
|
return 0;
|
|
}
|
|
|
|
static av_cold int ape_decode_close(AVCodecContext * avctx)
|
|
{
|
|
APEContext *s = avctx->priv_data;
|
|
int i;
|
|
|
|
for (i = 0; i < APE_FILTER_LEVELS; i++)
|
|
av_freep(&s->filterbuf[i]);
|
|
|
|
av_freep(&s->data);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* @defgroup rangecoder APE range decoder
|
|
* @{
|
|
*/
|
|
|
|
#define CODE_BITS 32
|
|
#define TOP_VALUE ((unsigned int)1 << (CODE_BITS-1))
|
|
#define SHIFT_BITS (CODE_BITS - 9)
|
|
#define EXTRA_BITS ((CODE_BITS-2) % 8 + 1)
|
|
#define BOTTOM_VALUE (TOP_VALUE >> 8)
|
|
|
|
/** Start the decoder */
|
|
static inline void range_start_decoding(APEContext * ctx)
|
|
{
|
|
ctx->rc.buffer = bytestream_get_byte(&ctx->ptr);
|
|
ctx->rc.low = ctx->rc.buffer >> (8 - EXTRA_BITS);
|
|
ctx->rc.range = (uint32_t) 1 << EXTRA_BITS;
|
|
}
|
|
|
|
/** Perform normalization */
|
|
static inline void range_dec_normalize(APEContext * ctx)
|
|
{
|
|
while (ctx->rc.range <= BOTTOM_VALUE) {
|
|
ctx->rc.buffer <<= 8;
|
|
if(ctx->ptr < ctx->data_end)
|
|
ctx->rc.buffer += *ctx->ptr;
|
|
ctx->ptr++;
|
|
ctx->rc.low = (ctx->rc.low << 8) | ((ctx->rc.buffer >> 1) & 0xFF);
|
|
ctx->rc.range <<= 8;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Calculate culmulative frequency for next symbol. Does NO update!
|
|
* @param ctx decoder context
|
|
* @param tot_f is the total frequency or (code_value)1<<shift
|
|
* @return the culmulative frequency
|
|
*/
|
|
static inline int range_decode_culfreq(APEContext * ctx, int tot_f)
|
|
{
|
|
range_dec_normalize(ctx);
|
|
ctx->rc.help = ctx->rc.range / tot_f;
|
|
return ctx->rc.low / ctx->rc.help;
|
|
}
|
|
|
|
/**
|
|
* Decode value with given size in bits
|
|
* @param ctx decoder context
|
|
* @param shift number of bits to decode
|
|
*/
|
|
static inline int range_decode_culshift(APEContext * ctx, int shift)
|
|
{
|
|
range_dec_normalize(ctx);
|
|
ctx->rc.help = ctx->rc.range >> shift;
|
|
return ctx->rc.low / ctx->rc.help;
|
|
}
|
|
|
|
|
|
/**
|
|
* Update decoding state
|
|
* @param ctx decoder context
|
|
* @param sy_f the interval length (frequency of the symbol)
|
|
* @param lt_f the lower end (frequency sum of < symbols)
|
|
*/
|
|
static inline void range_decode_update(APEContext * ctx, int sy_f, int lt_f)
|
|
{
|
|
ctx->rc.low -= ctx->rc.help * lt_f;
|
|
ctx->rc.range = ctx->rc.help * sy_f;
|
|
}
|
|
|
|
/** Decode n bits (n <= 16) without modelling */
|
|
static inline int range_decode_bits(APEContext * ctx, int n)
|
|
{
|
|
int sym = range_decode_culshift(ctx, n);
|
|
range_decode_update(ctx, 1, sym);
|
|
return sym;
|
|
}
|
|
|
|
|
|
#define MODEL_ELEMENTS 64
|
|
|
|
/**
|
|
* Fixed probabilities for symbols in Monkey Audio version 3.97
|
|
*/
|
|
static const uint16_t counts_3970[22] = {
|
|
0, 14824, 28224, 39348, 47855, 53994, 58171, 60926,
|
|
62682, 63786, 64463, 64878, 65126, 65276, 65365, 65419,
|
|
65450, 65469, 65480, 65487, 65491, 65493,
|
|
};
|
|
|
|
/**
|
|
* Probability ranges for symbols in Monkey Audio version 3.97
|
|
*/
|
|
static const uint16_t counts_diff_3970[21] = {
|
|
14824, 13400, 11124, 8507, 6139, 4177, 2755, 1756,
|
|
1104, 677, 415, 248, 150, 89, 54, 31,
|
|
19, 11, 7, 4, 2,
|
|
};
|
|
|
|
/**
|
|
* Fixed probabilities for symbols in Monkey Audio version 3.98
|
|
*/
|
|
static const uint16_t counts_3980[22] = {
|
|
0, 19578, 36160, 48417, 56323, 60899, 63265, 64435,
|
|
64971, 65232, 65351, 65416, 65447, 65466, 65476, 65482,
|
|
65485, 65488, 65490, 65491, 65492, 65493,
|
|
};
|
|
|
|
/**
|
|
* Probability ranges for symbols in Monkey Audio version 3.98
|
|
*/
|
|
static const uint16_t counts_diff_3980[21] = {
|
|
19578, 16582, 12257, 7906, 4576, 2366, 1170, 536,
|
|
261, 119, 65, 31, 19, 10, 6, 3,
|
|
3, 2, 1, 1, 1,
|
|
};
|
|
|
|
/**
|
|
* Decode symbol
|
|
* @param ctx decoder context
|
|
* @param counts probability range start position
|
|
* @param counts_diff probability range widths
|
|
*/
|
|
static inline int range_get_symbol(APEContext * ctx,
|
|
const uint16_t counts[],
|
|
const uint16_t counts_diff[])
|
|
{
|
|
int symbol, cf;
|
|
|
|
cf = range_decode_culshift(ctx, 16);
|
|
|
|
if(cf > 65492){
|
|
symbol= cf - 65535 + 63;
|
|
range_decode_update(ctx, 1, cf);
|
|
if(cf > 65535)
|
|
ctx->error=1;
|
|
return symbol;
|
|
}
|
|
/* figure out the symbol inefficiently; a binary search would be much better */
|
|
for (symbol = 0; counts[symbol + 1] <= cf; symbol++);
|
|
|
|
range_decode_update(ctx, counts_diff[symbol], counts[symbol]);
|
|
|
|
return symbol;
|
|
}
|
|
/** @} */ // group rangecoder
|
|
|
|
static inline void update_rice(APERice *rice, int x)
|
|
{
|
|
int lim = rice->k ? (1 << (rice->k + 4)) : 0;
|
|
rice->ksum += ((x + 1) / 2) - ((rice->ksum + 16) >> 5);
|
|
|
|
if (rice->ksum < lim)
|
|
rice->k--;
|
|
else if (rice->ksum >= (1 << (rice->k + 5)))
|
|
rice->k++;
|
|
}
|
|
|
|
static inline int ape_decode_value(APEContext * ctx, APERice *rice)
|
|
{
|
|
int x, overflow;
|
|
|
|
if (ctx->fileversion < 3990) {
|
|
int tmpk;
|
|
|
|
overflow = range_get_symbol(ctx, counts_3970, counts_diff_3970);
|
|
|
|
if (overflow == (MODEL_ELEMENTS - 1)) {
|
|
tmpk = range_decode_bits(ctx, 5);
|
|
overflow = 0;
|
|
} else
|
|
tmpk = (rice->k < 1) ? 0 : rice->k - 1;
|
|
|
|
if (tmpk <= 16)
|
|
x = range_decode_bits(ctx, tmpk);
|
|
else {
|
|
x = range_decode_bits(ctx, 16);
|
|
x |= (range_decode_bits(ctx, tmpk - 16) << 16);
|
|
}
|
|
x += overflow << tmpk;
|
|
} else {
|
|
int base, pivot;
|
|
|
|
pivot = rice->ksum >> 5;
|
|
if (pivot == 0)
|
|
pivot = 1;
|
|
|
|
overflow = range_get_symbol(ctx, counts_3980, counts_diff_3980);
|
|
|
|
if (overflow == (MODEL_ELEMENTS - 1)) {
|
|
overflow = range_decode_bits(ctx, 16) << 16;
|
|
overflow |= range_decode_bits(ctx, 16);
|
|
}
|
|
|
|
if (pivot < 0x10000) {
|
|
base = range_decode_culfreq(ctx, pivot);
|
|
range_decode_update(ctx, 1, base);
|
|
} else {
|
|
int base_hi = pivot, base_lo;
|
|
int bbits = 0;
|
|
|
|
while (base_hi & ~0xFFFF) {
|
|
base_hi >>= 1;
|
|
bbits++;
|
|
}
|
|
base_hi = range_decode_culfreq(ctx, base_hi + 1);
|
|
range_decode_update(ctx, 1, base_hi);
|
|
base_lo = range_decode_culfreq(ctx, 1 << bbits);
|
|
range_decode_update(ctx, 1, base_lo);
|
|
|
|
base = (base_hi << bbits) + base_lo;
|
|
}
|
|
|
|
x = base + overflow * pivot;
|
|
}
|
|
|
|
update_rice(rice, x);
|
|
|
|
/* Convert to signed */
|
|
if (x & 1)
|
|
return (x >> 1) + 1;
|
|
else
|
|
return -(x >> 1);
|
|
}
|
|
|
|
static void entropy_decode(APEContext * ctx, int blockstodecode, int stereo)
|
|
{
|
|
int32_t *decoded0 = ctx->decoded0;
|
|
int32_t *decoded1 = ctx->decoded1;
|
|
|
|
ctx->blocksdecoded = blockstodecode;
|
|
|
|
if (ctx->frameflags & APE_FRAMECODE_STEREO_SILENCE) {
|
|
/* We are pure silence, just memset the output buffer. */
|
|
memset(decoded0, 0, blockstodecode * sizeof(int32_t));
|
|
memset(decoded1, 0, blockstodecode * sizeof(int32_t));
|
|
} else {
|
|
while (blockstodecode--) {
|
|
*decoded0++ = ape_decode_value(ctx, &ctx->riceY);
|
|
if (stereo)
|
|
*decoded1++ = ape_decode_value(ctx, &ctx->riceX);
|
|
}
|
|
}
|
|
|
|
if (ctx->blocksdecoded == ctx->currentframeblocks)
|
|
range_dec_normalize(ctx); /* normalize to use up all bytes */
|
|
}
|
|
|
|
static void init_entropy_decoder(APEContext * ctx)
|
|
{
|
|
/* Read the CRC */
|
|
ctx->CRC = bytestream_get_be32(&ctx->ptr);
|
|
|
|
/* Read the frame flags if they exist */
|
|
ctx->frameflags = 0;
|
|
if ((ctx->fileversion > 3820) && (ctx->CRC & 0x80000000)) {
|
|
ctx->CRC &= ~0x80000000;
|
|
|
|
ctx->frameflags = bytestream_get_be32(&ctx->ptr);
|
|
}
|
|
|
|
/* Keep a count of the blocks decoded in this frame */
|
|
ctx->blocksdecoded = 0;
|
|
|
|
/* Initialize the rice structs */
|
|
ctx->riceX.k = 10;
|
|
ctx->riceX.ksum = (1 << ctx->riceX.k) * 16;
|
|
ctx->riceY.k = 10;
|
|
ctx->riceY.ksum = (1 << ctx->riceY.k) * 16;
|
|
|
|
/* The first 8 bits of input are ignored. */
|
|
ctx->ptr++;
|
|
|
|
range_start_decoding(ctx);
|
|
}
|
|
|
|
static const int32_t initial_coeffs[4] = {
|
|
360, 317, -109, 98
|
|
};
|
|
|
|
static void init_predictor_decoder(APEContext * ctx)
|
|
{
|
|
APEPredictor *p = &ctx->predictor;
|
|
|
|
/* Zero the history buffers */
|
|
memset(p->historybuffer, 0, PREDICTOR_SIZE * sizeof(int32_t));
|
|
p->buf = p->historybuffer;
|
|
|
|
/* Initialize and zero the coefficients */
|
|
memcpy(p->coeffsA[0], initial_coeffs, sizeof(initial_coeffs));
|
|
memcpy(p->coeffsA[1], initial_coeffs, sizeof(initial_coeffs));
|
|
memset(p->coeffsB, 0, sizeof(p->coeffsB));
|
|
|
|
p->filterA[0] = p->filterA[1] = 0;
|
|
p->filterB[0] = p->filterB[1] = 0;
|
|
p->lastA[0] = p->lastA[1] = 0;
|
|
}
|
|
|
|
/** Get inverse sign of integer (-1 for positive, 1 for negative and 0 for zero) */
|
|
static inline int APESIGN(int32_t x) {
|
|
return (x < 0) - (x > 0);
|
|
}
|
|
|
|
static av_always_inline int predictor_update_filter(APEPredictor *p, const int decoded, const int filter, const int delayA, const int delayB, const int adaptA, const int adaptB)
|
|
{
|
|
int32_t predictionA, predictionB, sign;
|
|
|
|
p->buf[delayA] = p->lastA[filter];
|
|
p->buf[adaptA] = APESIGN(p->buf[delayA]);
|
|
p->buf[delayA - 1] = p->buf[delayA] - p->buf[delayA - 1];
|
|
p->buf[adaptA - 1] = APESIGN(p->buf[delayA - 1]);
|
|
|
|
predictionA = p->buf[delayA ] * p->coeffsA[filter][0] +
|
|
p->buf[delayA - 1] * p->coeffsA[filter][1] +
|
|
p->buf[delayA - 2] * p->coeffsA[filter][2] +
|
|
p->buf[delayA - 3] * p->coeffsA[filter][3];
|
|
|
|
/* Apply a scaled first-order filter compression */
|
|
p->buf[delayB] = p->filterA[filter ^ 1] - ((p->filterB[filter] * 31) >> 5);
|
|
p->buf[adaptB] = APESIGN(p->buf[delayB]);
|
|
p->buf[delayB - 1] = p->buf[delayB] - p->buf[delayB - 1];
|
|
p->buf[adaptB - 1] = APESIGN(p->buf[delayB - 1]);
|
|
p->filterB[filter] = p->filterA[filter ^ 1];
|
|
|
|
predictionB = p->buf[delayB ] * p->coeffsB[filter][0] +
|
|
p->buf[delayB - 1] * p->coeffsB[filter][1] +
|
|
p->buf[delayB - 2] * p->coeffsB[filter][2] +
|
|
p->buf[delayB - 3] * p->coeffsB[filter][3] +
|
|
p->buf[delayB - 4] * p->coeffsB[filter][4];
|
|
|
|
p->lastA[filter] = decoded + ((predictionA + (predictionB >> 1)) >> 10);
|
|
p->filterA[filter] = p->lastA[filter] + ((p->filterA[filter] * 31) >> 5);
|
|
|
|
sign = APESIGN(decoded);
|
|
p->coeffsA[filter][0] += p->buf[adaptA ] * sign;
|
|
p->coeffsA[filter][1] += p->buf[adaptA - 1] * sign;
|
|
p->coeffsA[filter][2] += p->buf[adaptA - 2] * sign;
|
|
p->coeffsA[filter][3] += p->buf[adaptA - 3] * sign;
|
|
p->coeffsB[filter][0] += p->buf[adaptB ] * sign;
|
|
p->coeffsB[filter][1] += p->buf[adaptB - 1] * sign;
|
|
p->coeffsB[filter][2] += p->buf[adaptB - 2] * sign;
|
|
p->coeffsB[filter][3] += p->buf[adaptB - 3] * sign;
|
|
p->coeffsB[filter][4] += p->buf[adaptB - 4] * sign;
|
|
|
|
return p->filterA[filter];
|
|
}
|
|
|
|
static void predictor_decode_stereo(APEContext * ctx, int count)
|
|
{
|
|
APEPredictor *p = &ctx->predictor;
|
|
int32_t *decoded0 = ctx->decoded0;
|
|
int32_t *decoded1 = ctx->decoded1;
|
|
|
|
while (count--) {
|
|
/* Predictor Y */
|
|
*decoded0 = predictor_update_filter(p, *decoded0, 0, YDELAYA, YDELAYB, YADAPTCOEFFSA, YADAPTCOEFFSB);
|
|
decoded0++;
|
|
*decoded1 = predictor_update_filter(p, *decoded1, 1, XDELAYA, XDELAYB, XADAPTCOEFFSA, XADAPTCOEFFSB);
|
|
decoded1++;
|
|
|
|
/* Combined */
|
|
p->buf++;
|
|
|
|
/* Have we filled the history buffer? */
|
|
if (p->buf == p->historybuffer + HISTORY_SIZE) {
|
|
memmove(p->historybuffer, p->buf, PREDICTOR_SIZE * sizeof(int32_t));
|
|
p->buf = p->historybuffer;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void predictor_decode_mono(APEContext * ctx, int count)
|
|
{
|
|
APEPredictor *p = &ctx->predictor;
|
|
int32_t *decoded0 = ctx->decoded0;
|
|
int32_t predictionA, currentA, A, sign;
|
|
|
|
currentA = p->lastA[0];
|
|
|
|
while (count--) {
|
|
A = *decoded0;
|
|
|
|
p->buf[YDELAYA] = currentA;
|
|
p->buf[YDELAYA - 1] = p->buf[YDELAYA] - p->buf[YDELAYA - 1];
|
|
|
|
predictionA = p->buf[YDELAYA ] * p->coeffsA[0][0] +
|
|
p->buf[YDELAYA - 1] * p->coeffsA[0][1] +
|
|
p->buf[YDELAYA - 2] * p->coeffsA[0][2] +
|
|
p->buf[YDELAYA - 3] * p->coeffsA[0][3];
|
|
|
|
currentA = A + (predictionA >> 10);
|
|
|
|
p->buf[YADAPTCOEFFSA] = APESIGN(p->buf[YDELAYA ]);
|
|
p->buf[YADAPTCOEFFSA - 1] = APESIGN(p->buf[YDELAYA - 1]);
|
|
|
|
sign = APESIGN(A);
|
|
p->coeffsA[0][0] += p->buf[YADAPTCOEFFSA ] * sign;
|
|
p->coeffsA[0][1] += p->buf[YADAPTCOEFFSA - 1] * sign;
|
|
p->coeffsA[0][2] += p->buf[YADAPTCOEFFSA - 2] * sign;
|
|
p->coeffsA[0][3] += p->buf[YADAPTCOEFFSA - 3] * sign;
|
|
|
|
p->buf++;
|
|
|
|
/* Have we filled the history buffer? */
|
|
if (p->buf == p->historybuffer + HISTORY_SIZE) {
|
|
memmove(p->historybuffer, p->buf, PREDICTOR_SIZE * sizeof(int32_t));
|
|
p->buf = p->historybuffer;
|
|
}
|
|
|
|
p->filterA[0] = currentA + ((p->filterA[0] * 31) >> 5);
|
|
*(decoded0++) = p->filterA[0];
|
|
}
|
|
|
|
p->lastA[0] = currentA;
|
|
}
|
|
|
|
static void do_init_filter(APEFilter *f, int16_t * buf, int order)
|
|
{
|
|
f->coeffs = buf;
|
|
f->historybuffer = buf + order;
|
|
f->delay = f->historybuffer + order * 2;
|
|
f->adaptcoeffs = f->historybuffer + order;
|
|
|
|
memset(f->historybuffer, 0, (order * 2) * sizeof(int16_t));
|
|
memset(f->coeffs, 0, order * sizeof(int16_t));
|
|
f->avg = 0;
|
|
}
|
|
|
|
static void init_filter(APEContext * ctx, APEFilter *f, int16_t * buf, int order)
|
|
{
|
|
do_init_filter(&f[0], buf, order);
|
|
do_init_filter(&f[1], buf + order * 3 + HISTORY_SIZE, order);
|
|
}
|
|
|
|
static void do_apply_filter(APEContext * ctx, int version, APEFilter *f, int32_t *data, int count, int order, int fracbits)
|
|
{
|
|
int res;
|
|
int absres;
|
|
|
|
while (count--) {
|
|
/* round fixedpoint scalar product */
|
|
res = ctx->dsp.scalarproduct_and_madd_int16(f->coeffs, f->delay - order, f->adaptcoeffs - order, order, APESIGN(*data));
|
|
res = (res + (1 << (fracbits - 1))) >> fracbits;
|
|
res += *data;
|
|
*data++ = res;
|
|
|
|
/* Update the output history */
|
|
*f->delay++ = av_clip_int16(res);
|
|
|
|
if (version < 3980) {
|
|
/* Version ??? to < 3.98 files (untested) */
|
|
f->adaptcoeffs[0] = (res == 0) ? 0 : ((res >> 28) & 8) - 4;
|
|
f->adaptcoeffs[-4] >>= 1;
|
|
f->adaptcoeffs[-8] >>= 1;
|
|
} else {
|
|
/* Version 3.98 and later files */
|
|
|
|
/* Update the adaption coefficients */
|
|
absres = FFABS(res);
|
|
if (absres)
|
|
*f->adaptcoeffs = ((res & (1<<31)) - (1<<30)) >> (25 + (absres <= f->avg*3) + (absres <= f->avg*4/3));
|
|
else
|
|
*f->adaptcoeffs = 0;
|
|
|
|
f->avg += (absres - f->avg) / 16;
|
|
|
|
f->adaptcoeffs[-1] >>= 1;
|
|
f->adaptcoeffs[-2] >>= 1;
|
|
f->adaptcoeffs[-8] >>= 1;
|
|
}
|
|
|
|
f->adaptcoeffs++;
|
|
|
|
/* Have we filled the history buffer? */
|
|
if (f->delay == f->historybuffer + HISTORY_SIZE + (order * 2)) {
|
|
memmove(f->historybuffer, f->delay - (order * 2),
|
|
(order * 2) * sizeof(int16_t));
|
|
f->delay = f->historybuffer + order * 2;
|
|
f->adaptcoeffs = f->historybuffer + order;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void apply_filter(APEContext * ctx, APEFilter *f,
|
|
int32_t * data0, int32_t * data1,
|
|
int count, int order, int fracbits)
|
|
{
|
|
do_apply_filter(ctx, ctx->fileversion, &f[0], data0, count, order, fracbits);
|
|
if (data1)
|
|
do_apply_filter(ctx, ctx->fileversion, &f[1], data1, count, order, fracbits);
|
|
}
|
|
|
|
static void ape_apply_filters(APEContext * ctx, int32_t * decoded0,
|
|
int32_t * decoded1, int count)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < APE_FILTER_LEVELS; i++) {
|
|
if (!ape_filter_orders[ctx->fset][i])
|
|
break;
|
|
apply_filter(ctx, ctx->filters[i], decoded0, decoded1, count, ape_filter_orders[ctx->fset][i], ape_filter_fracbits[ctx->fset][i]);
|
|
}
|
|
}
|
|
|
|
static void init_frame_decoder(APEContext * ctx)
|
|
{
|
|
int i;
|
|
init_entropy_decoder(ctx);
|
|
init_predictor_decoder(ctx);
|
|
|
|
for (i = 0; i < APE_FILTER_LEVELS; i++) {
|
|
if (!ape_filter_orders[ctx->fset][i])
|
|
break;
|
|
init_filter(ctx, ctx->filters[i], ctx->filterbuf[i], ape_filter_orders[ctx->fset][i]);
|
|
}
|
|
}
|
|
|
|
static void ape_unpack_mono(APEContext * ctx, int count)
|
|
{
|
|
int32_t left;
|
|
int32_t *decoded0 = ctx->decoded0;
|
|
int32_t *decoded1 = ctx->decoded1;
|
|
|
|
if (ctx->frameflags & APE_FRAMECODE_STEREO_SILENCE) {
|
|
entropy_decode(ctx, count, 0);
|
|
/* We are pure silence, so we're done. */
|
|
av_log(ctx->avctx, AV_LOG_DEBUG, "pure silence mono\n");
|
|
return;
|
|
}
|
|
|
|
entropy_decode(ctx, count, 0);
|
|
ape_apply_filters(ctx, decoded0, NULL, count);
|
|
|
|
/* Now apply the predictor decoding */
|
|
predictor_decode_mono(ctx, count);
|
|
|
|
/* Pseudo-stereo - just copy left channel to right channel */
|
|
if (ctx->channels == 2) {
|
|
while (count--) {
|
|
left = *decoded0;
|
|
*(decoded1++) = *(decoded0++) = left;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void ape_unpack_stereo(APEContext * ctx, int count)
|
|
{
|
|
int32_t left, right;
|
|
int32_t *decoded0 = ctx->decoded0;
|
|
int32_t *decoded1 = ctx->decoded1;
|
|
|
|
if (ctx->frameflags & APE_FRAMECODE_STEREO_SILENCE) {
|
|
/* We are pure silence, so we're done. */
|
|
av_log(ctx->avctx, AV_LOG_DEBUG, "pure silence stereo\n");
|
|
return;
|
|
}
|
|
|
|
entropy_decode(ctx, count, 1);
|
|
ape_apply_filters(ctx, decoded0, decoded1, count);
|
|
|
|
/* Now apply the predictor decoding */
|
|
predictor_decode_stereo(ctx, count);
|
|
|
|
/* Decorrelate and scale to output depth */
|
|
while (count--) {
|
|
left = *decoded1 - (*decoded0 / 2);
|
|
right = left + *decoded0;
|
|
|
|
*(decoded0++) = left;
|
|
*(decoded1++) = right;
|
|
}
|
|
}
|
|
|
|
static int ape_decode_frame(AVCodecContext * avctx,
|
|
void *data, int *data_size,
|
|
AVPacket *avpkt)
|
|
{
|
|
const uint8_t *buf = avpkt->data;
|
|
int buf_size = avpkt->size;
|
|
APEContext *s = avctx->priv_data;
|
|
int16_t *samples = data;
|
|
int nblocks;
|
|
int i, n;
|
|
int blockstodecode;
|
|
int bytes_used;
|
|
|
|
if (buf_size == 0 && !s->samples) {
|
|
*data_size = 0;
|
|
return 0;
|
|
}
|
|
|
|
/* should not happen but who knows */
|
|
if (BLOCKS_PER_LOOP * 2 * avctx->channels > *data_size) {
|
|
av_log (avctx, AV_LOG_ERROR, "Packet size is too big to be handled in lavc! (max is %d where you have %d)\n", *data_size, s->samples * 2 * avctx->channels);
|
|
return -1;
|
|
}
|
|
|
|
if(!s->samples){
|
|
s->data = av_realloc(s->data, (buf_size + 3) & ~3);
|
|
s->dsp.bswap_buf((uint32_t*)s->data, (const uint32_t*)buf, buf_size >> 2);
|
|
s->ptr = s->last_ptr = s->data;
|
|
s->data_end = s->data + buf_size;
|
|
|
|
nblocks = s->samples = bytestream_get_be32(&s->ptr);
|
|
n = bytestream_get_be32(&s->ptr);
|
|
if(n < 0 || n > 3){
|
|
av_log(avctx, AV_LOG_ERROR, "Incorrect offset passed\n");
|
|
s->data = NULL;
|
|
return -1;
|
|
}
|
|
s->ptr += n;
|
|
|
|
s->currentframeblocks = nblocks;
|
|
buf += 4;
|
|
if (s->samples <= 0) {
|
|
*data_size = 0;
|
|
return buf_size;
|
|
}
|
|
|
|
memset(s->decoded0, 0, sizeof(s->decoded0));
|
|
memset(s->decoded1, 0, sizeof(s->decoded1));
|
|
|
|
/* Initialize the frame decoder */
|
|
init_frame_decoder(s);
|
|
}
|
|
|
|
if (!s->data) {
|
|
*data_size = 0;
|
|
return buf_size;
|
|
}
|
|
|
|
nblocks = s->samples;
|
|
blockstodecode = FFMIN(BLOCKS_PER_LOOP, nblocks);
|
|
|
|
s->error=0;
|
|
|
|
if ((s->channels == 1) || (s->frameflags & APE_FRAMECODE_PSEUDO_STEREO))
|
|
ape_unpack_mono(s, blockstodecode);
|
|
else
|
|
ape_unpack_stereo(s, blockstodecode);
|
|
emms_c();
|
|
|
|
if(s->error || s->ptr > s->data_end){
|
|
s->samples=0;
|
|
av_log(avctx, AV_LOG_ERROR, "Error decoding frame\n");
|
|
return -1;
|
|
}
|
|
|
|
for (i = 0; i < blockstodecode; i++) {
|
|
*samples++ = s->decoded0[i];
|
|
if(s->channels == 2)
|
|
*samples++ = s->decoded1[i];
|
|
}
|
|
|
|
s->samples -= blockstodecode;
|
|
|
|
*data_size = blockstodecode * 2 * s->channels;
|
|
bytes_used = s->samples ? s->ptr - s->last_ptr : buf_size;
|
|
s->last_ptr = s->ptr;
|
|
return bytes_used;
|
|
}
|
|
|
|
static void ape_flush(AVCodecContext *avctx)
|
|
{
|
|
APEContext *s = avctx->priv_data;
|
|
s->samples= 0;
|
|
}
|
|
|
|
AVCodec ff_ape_decoder = {
|
|
"ape",
|
|
AVMEDIA_TYPE_AUDIO,
|
|
CODEC_ID_APE,
|
|
sizeof(APEContext),
|
|
ape_decode_init,
|
|
NULL,
|
|
ape_decode_close,
|
|
ape_decode_frame,
|
|
.capabilities = CODEC_CAP_SUBFRAMES,
|
|
.flush = ape_flush,
|
|
.long_name = NULL_IF_CONFIG_SMALL("Monkey's Audio"),
|
|
};
|