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FFmpeg/libavcodec/apedec.c
Andreas Rheinhardt 4243da4ff4 avcodec/codec_internal: Use union for FFCodec decode/encode callbacks 
This is possible, because every given FFCodec has to implement
exactly one of these. Doing so decreases sizeof(FFCodec) and
therefore decreases the size of the binary.
Notice that in case of position-independent code the decrease
is in .data.rel.ro, so that this translates to decreased
memory consumption.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-04-05 20:02:37 +02:00

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/*
* 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
*/
#include <inttypes.h>
#include "libavutil/avassert.h"
#include "libavutil/channel_layout.h"
#include "libavutil/crc.h"
#include "libavutil/opt.h"
#include "lossless_audiodsp.h"
#include "avcodec.h"
#include "bswapdsp.h"
#include "bytestream.h"
#include "codec_internal.h"
#include "internal.h"
#include "get_bits.h"
#include "unary.h"
/**
* @file
* Monkey's Audio lossless audio decoder
*/
#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
uint32_t 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];
uint32_t coeffsA[2][4]; ///< adaption coefficients
uint32_t coeffsB[2][5]; ///< adaption coefficients
int32_t historybuffer[HISTORY_SIZE + PREDICTOR_SIZE];
unsigned int sample_pos;
} APEPredictor;
typedef struct APEPredictor64 {
int64_t *buf;
int64_t lastA[2];
int64_t filterA[2];
int64_t filterB[2];
uint64_t coeffsA[2][4]; ///< adaption coefficients
uint64_t coeffsB[2][5]; ///< adaption coefficients
int64_t historybuffer[HISTORY_SIZE + PREDICTOR_SIZE];
unsigned int sample_pos;
} APEPredictor64;
/** Decoder context */
typedef struct APEContext {
AVClass *class; ///< class for AVOptions
AVCodecContext *avctx;
BswapDSPContext bdsp;
LLAudDSPContext adsp;
int channels;
int samples; ///< samples left to decode in current frame
int bps;
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; ///< signalled frame CRC
uint32_t CRC_state; ///< accumulated CRC
int frameflags; ///< frame flags
APEPredictor predictor; ///< predictor used for final reconstruction
APEPredictor64 predictor64; ///< 64bit predictor used for final reconstruction
int32_t *decoded_buffer;
int decoded_size;
int32_t *decoded[MAX_CHANNELS]; ///< decoded data for each channel
int blocks_per_loop; ///< maximum number of samples to decode for each call
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
GetBitContext gb;
uint8_t *data; ///< current frame data
uint8_t *data_end; ///< frame data end
int data_size; ///< frame data allocated size
const uint8_t *ptr; ///< current position in frame data
int error;
void (*entropy_decode_mono)(struct APEContext *ctx, int blockstodecode);
void (*entropy_decode_stereo)(struct APEContext *ctx, int blockstodecode);
void (*predictor_decode_mono)(struct APEContext *ctx, int count);
void (*predictor_decode_stereo)(struct APEContext *ctx, int count);
} APEContext;
static void ape_apply_filters(APEContext *ctx, int32_t *decoded0,
int32_t *decoded1, int count);
static void entropy_decode_mono_0000(APEContext *ctx, int blockstodecode);
static void entropy_decode_stereo_0000(APEContext *ctx, int blockstodecode);
static void entropy_decode_mono_3860(APEContext *ctx, int blockstodecode);
static void entropy_decode_stereo_3860(APEContext *ctx, int blockstodecode);
static void entropy_decode_mono_3900(APEContext *ctx, int blockstodecode);
static void entropy_decode_stereo_3900(APEContext *ctx, int blockstodecode);
static void entropy_decode_stereo_3930(APEContext *ctx, int blockstodecode);
static void entropy_decode_mono_3990(APEContext *ctx, int blockstodecode);
static void entropy_decode_stereo_3990(APEContext *ctx, int blockstodecode);
static void predictor_decode_mono_3800(APEContext *ctx, int count);
static void predictor_decode_stereo_3800(APEContext *ctx, int count);
static void predictor_decode_mono_3930(APEContext *ctx, int count);
static void predictor_decode_stereo_3930(APEContext *ctx, int count);
static void predictor_decode_mono_3950(APEContext *ctx, int count);
static void predictor_decode_stereo_3950(APEContext *ctx, int count);
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->decoded_buffer);
av_freep(&s->data);
s->decoded_size = s->data_size = 0;
return 0;
}
static av_cold int ape_decode_init(AVCodecContext *avctx)
{
APEContext *s = avctx->priv_data;
int channels = avctx->ch_layout.nb_channels;
int i;
if (avctx->extradata_size != 6) {
av_log(avctx, AV_LOG_ERROR, "Incorrect extradata\n");
return AVERROR(EINVAL);
}
if (channels > 2) {
av_log(avctx, AV_LOG_ERROR, "Only mono and stereo is supported\n");
return AVERROR(EINVAL);
}
avctx->bits_per_raw_sample =
s->bps = avctx->bits_per_coded_sample;
switch (s->bps) {
case 8:
avctx->sample_fmt = AV_SAMPLE_FMT_U8P;
break;
case 16:
avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
break;
case 24:
avctx->sample_fmt = AV_SAMPLE_FMT_S32P;
break;
default:
avpriv_request_sample(avctx,
"%d bits per coded sample", s->bps);
return AVERROR_PATCHWELCOME;
}
s->avctx = avctx;
s->channels = 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_VERBOSE, "Compression Level: %d - Flags: %d\n",
s->compression_level, s->flags);
if (s->compression_level % 1000 || s->compression_level > COMPRESSION_LEVEL_INSANE ||
!s->compression_level ||
(s->fileversion < 3930 && s->compression_level == COMPRESSION_LEVEL_INSANE)) {
av_log(avctx, AV_LOG_ERROR, "Incorrect compression level %d\n",
s->compression_level);
return AVERROR_INVALIDDATA;
}
s->fset = s->compression_level / 1000 - 1;
for (i = 0; i < APE_FILTER_LEVELS; i++) {
if (!ape_filter_orders[s->fset][i])
break;
if (!(s->filterbuf[i] = av_malloc((ape_filter_orders[s->fset][i] * 3 + HISTORY_SIZE) * 4)))
return AVERROR(ENOMEM);
}
if (s->fileversion < 3860) {
s->entropy_decode_mono = entropy_decode_mono_0000;
s->entropy_decode_stereo = entropy_decode_stereo_0000;
} else if (s->fileversion < 3900) {
s->entropy_decode_mono = entropy_decode_mono_3860;
s->entropy_decode_stereo = entropy_decode_stereo_3860;
} else if (s->fileversion < 3930) {
s->entropy_decode_mono = entropy_decode_mono_3900;
s->entropy_decode_stereo = entropy_decode_stereo_3900;
} else if (s->fileversion < 3990) {
s->entropy_decode_mono = entropy_decode_mono_3900;
s->entropy_decode_stereo = entropy_decode_stereo_3930;
} else {
s->entropy_decode_mono = entropy_decode_mono_3990;
s->entropy_decode_stereo = entropy_decode_stereo_3990;
}
if (s->fileversion < 3930) {
s->predictor_decode_mono = predictor_decode_mono_3800;
s->predictor_decode_stereo = predictor_decode_stereo_3800;
} else if (s->fileversion < 3950) {
s->predictor_decode_mono = predictor_decode_mono_3930;
s->predictor_decode_stereo = predictor_decode_stereo_3930;
} else {
s->predictor_decode_mono = predictor_decode_mono_3950;
s->predictor_decode_stereo = predictor_decode_stereo_3950;
}
ff_bswapdsp_init(&s->bdsp);
ff_llauddsp_init(&s->adsp);
av_channel_layout_uninit(&avctx->ch_layout);
avctx->ch_layout = (channels == 2) ? (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO
: (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
return 0;
}
/**
* @name APE range decoding functions
* @{
*/
#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++;
} else {
ctx->error = 1;
}
ctx->rc.low = (ctx->rc.low << 8) | ((ctx->rc.buffer >> 1) & 0xFF);
ctx->rc.range <<= 8;
}
}
/**
* Calculate cumulative 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 cumulative 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, unsigned 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 < 24)
rice->k++;
}
static inline int get_rice_ook(GetBitContext *gb, int k)
{
unsigned int x;
x = get_unary(gb, 1, get_bits_left(gb));
if (k)
x = (x << k) | get_bits(gb, k);
return x;
}
static inline int ape_decode_value_3860(APEContext *ctx, GetBitContext *gb,
APERice *rice)
{
unsigned int x, overflow;
overflow = get_unary(gb, 1, get_bits_left(gb));
if (ctx->fileversion > 3880) {
while (overflow >= 16) {
overflow -= 16;
rice->k += 4;
}
}
if (!rice->k)
x = overflow;
else if(rice->k <= MIN_CACHE_BITS) {
x = (overflow << rice->k) + get_bits(gb, rice->k);
} else {
av_log(ctx->avctx, AV_LOG_ERROR, "Too many bits: %"PRIu32"\n", rice->k);
ctx->error = 1;
return AVERROR_INVALIDDATA;
}
rice->ksum += x - (rice->ksum + 8 >> 4);
if (rice->ksum < (rice->k ? 1 << (rice->k + 4) : 0))
rice->k--;
else if (rice->ksum >= (1 << (rice->k + 5)) && rice->k < 24)
rice->k++;
/* Convert to signed */
return ((x >> 1) ^ ((x & 1) - 1)) + 1;
}
static inline int ape_decode_value_3900(APEContext *ctx, APERice *rice)
{
unsigned int x, overflow;
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 || ctx->fileversion < 3910) {
if (tmpk > 23) {
av_log(ctx->avctx, AV_LOG_ERROR, "Too many bits: %d\n", tmpk);
return AVERROR_INVALIDDATA;
}
x = range_decode_bits(ctx, tmpk);
} else if (tmpk <= 31) {
x = range_decode_bits(ctx, 16);
x |= (range_decode_bits(ctx, tmpk - 16) << 16);
} else {
av_log(ctx->avctx, AV_LOG_ERROR, "Too many bits: %d\n", tmpk);
return AVERROR_INVALIDDATA;
}
x += overflow << tmpk;
update_rice(rice, x);
/* Convert to signed */
return ((x >> 1) ^ ((x & 1) - 1)) + 1;
}
static inline int ape_decode_value_3990(APEContext *ctx, APERice *rice)
{
unsigned int x, overflow, pivot;
int base;
pivot = FFMAX(rice->ksum >> 5, 1);
overflow = range_get_symbol(ctx, counts_3980, counts_diff_3980);
if (overflow == (MODEL_ELEMENTS - 1)) {
overflow = (unsigned)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 */
return ((x >> 1) ^ ((x & 1) - 1)) + 1;
}
static int get_k(int ksum)
{
return av_log2(ksum) + !!ksum;
}
static void decode_array_0000(APEContext *ctx, GetBitContext *gb,
int32_t *out, APERice *rice, int blockstodecode)
{
int i;
unsigned ksummax, ksummin;
rice->ksum = 0;
for (i = 0; i < FFMIN(blockstodecode, 5); i++) {
out[i] = get_rice_ook(&ctx->gb, 10);
rice->ksum += out[i];
}
if (blockstodecode <= 5)
goto end;
rice->k = get_k(rice->ksum / 10);
if (rice->k >= 24)
return;
for (; i < FFMIN(blockstodecode, 64); i++) {
out[i] = get_rice_ook(&ctx->gb, rice->k);
rice->ksum += out[i];
rice->k = get_k(rice->ksum / ((i + 1) * 2));
if (rice->k >= 24)
return;
}
if (blockstodecode <= 64)
goto end;
rice->k = get_k(rice->ksum >> 7);
ksummax = 1 << rice->k + 7;
ksummin = rice->k ? (1 << rice->k + 6) : 0;
for (; i < blockstodecode; i++) {
if (get_bits_left(&ctx->gb) < 1) {
ctx->error = 1;
return;
}
out[i] = get_rice_ook(&ctx->gb, rice->k);
rice->ksum += out[i] - (unsigned)out[i - 64];
while (rice->ksum < ksummin) {
rice->k--;
ksummin = rice->k ? ksummin >> 1 : 0;
ksummax >>= 1;
}
while (rice->ksum >= ksummax) {
rice->k++;
if (rice->k > 24)
return;
ksummax <<= 1;
ksummin = ksummin ? ksummin << 1 : 128;
}
}
end:
for (i = 0; i < blockstodecode; i++)
out[i] = ((out[i] >> 1) ^ ((out[i] & 1) - 1)) + 1;
}
static void entropy_decode_mono_0000(APEContext *ctx, int blockstodecode)
{
decode_array_0000(ctx, &ctx->gb, ctx->decoded[0], &ctx->riceY,
blockstodecode);
}
static void entropy_decode_stereo_0000(APEContext *ctx, int blockstodecode)
{
decode_array_0000(ctx, &ctx->gb, ctx->decoded[0], &ctx->riceY,
blockstodecode);
decode_array_0000(ctx, &ctx->gb, ctx->decoded[1], &ctx->riceX,
blockstodecode);
}
static void entropy_decode_mono_3860(APEContext *ctx, int blockstodecode)
{
int32_t *decoded0 = ctx->decoded[0];
while (blockstodecode--)
*decoded0++ = ape_decode_value_3860(ctx, &ctx->gb, &ctx->riceY);
}
static void entropy_decode_stereo_3860(APEContext *ctx, int blockstodecode)
{
int32_t *decoded0 = ctx->decoded[0];
int32_t *decoded1 = ctx->decoded[1];
int blocks = blockstodecode;
while (blockstodecode--)
*decoded0++ = ape_decode_value_3860(ctx, &ctx->gb, &ctx->riceY);
while (blocks--)
*decoded1++ = ape_decode_value_3860(ctx, &ctx->gb, &ctx->riceX);
}
static void entropy_decode_mono_3900(APEContext *ctx, int blockstodecode)
{
int32_t *decoded0 = ctx->decoded[0];
while (blockstodecode--)
*decoded0++ = ape_decode_value_3900(ctx, &ctx->riceY);
}
static void entropy_decode_stereo_3900(APEContext *ctx, int blockstodecode)
{
int32_t *decoded0 = ctx->decoded[0];
int32_t *decoded1 = ctx->decoded[1];
int blocks = blockstodecode;
while (blockstodecode--)
*decoded0++ = ape_decode_value_3900(ctx, &ctx->riceY);
range_dec_normalize(ctx);
// because of some implementation peculiarities we need to backpedal here
ctx->ptr -= 1;
range_start_decoding(ctx);
while (blocks--)
*decoded1++ = ape_decode_value_3900(ctx, &ctx->riceX);
}
static void entropy_decode_stereo_3930(APEContext *ctx, int blockstodecode)
{
int32_t *decoded0 = ctx->decoded[0];
int32_t *decoded1 = ctx->decoded[1];
while (blockstodecode--) {
*decoded0++ = ape_decode_value_3900(ctx, &ctx->riceY);
*decoded1++ = ape_decode_value_3900(ctx, &ctx->riceX);
}
}
static void entropy_decode_mono_3990(APEContext *ctx, int blockstodecode)
{
int32_t *decoded0 = ctx->decoded[0];
while (blockstodecode--)
*decoded0++ = ape_decode_value_3990(ctx, &ctx->riceY);
}
static void entropy_decode_stereo_3990(APEContext *ctx, int blockstodecode)
{
int32_t *decoded0 = ctx->decoded[0];
int32_t *decoded1 = ctx->decoded[1];
while (blockstodecode--) {
*decoded0++ = ape_decode_value_3990(ctx, &ctx->riceY);
*decoded1++ = ape_decode_value_3990(ctx, &ctx->riceX);
}
}
static int init_entropy_decoder(APEContext *ctx)
{
/* Read the CRC */
if (ctx->fileversion >= 3900) {
if (ctx->data_end - ctx->ptr < 6)
return AVERROR_INVALIDDATA;
ctx->CRC = bytestream_get_be32(&ctx->ptr);
} else {
ctx->CRC = get_bits_long(&ctx->gb, 32);
}
/* Read the frame flags if they exist */
ctx->frameflags = 0;
ctx->CRC_state = UINT32_MAX;
if ((ctx->fileversion > 3820) && (ctx->CRC & 0x80000000)) {
ctx->CRC &= ~0x80000000;
if (ctx->data_end - ctx->ptr < 6)
return AVERROR_INVALIDDATA;
ctx->frameflags = bytestream_get_be32(&ctx->ptr);
}
/* 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;
if (ctx->fileversion >= 3900) {
/* The first 8 bits of input are ignored. */
ctx->ptr++;
range_start_decoding(ctx);
}
return 0;
}
static const int32_t initial_coeffs_fast_3320[1] = {
375,
};
static const int32_t initial_coeffs_a_3800[3] = {
64, 115, 64,
};
static const int32_t initial_coeffs_b_3800[2] = {
740, 0
};
static const int32_t initial_coeffs_3930[4] = {
360, 317, -109, 98
};
static const int64_t initial_coeffs_3930_64bit[4] = {
360, 317, -109, 98
};
static void init_predictor_decoder(APEContext *ctx)
{
APEPredictor *p = &ctx->predictor;
APEPredictor64 *p64 = &ctx->predictor64;
/* Zero the history buffers */
memset(p->historybuffer, 0, PREDICTOR_SIZE * sizeof(*p->historybuffer));
memset(p64->historybuffer, 0, PREDICTOR_SIZE * sizeof(*p64->historybuffer));
p->buf = p->historybuffer;
p64->buf = p64->historybuffer;
/* Initialize and zero the coefficients */
if (ctx->fileversion < 3930) {
if (ctx->compression_level == COMPRESSION_LEVEL_FAST) {
memcpy(p->coeffsA[0], initial_coeffs_fast_3320,
sizeof(initial_coeffs_fast_3320));
memcpy(p->coeffsA[1], initial_coeffs_fast_3320,
sizeof(initial_coeffs_fast_3320));
} else {
memcpy(p->coeffsA[0], initial_coeffs_a_3800,
sizeof(initial_coeffs_a_3800));
memcpy(p->coeffsA[1], initial_coeffs_a_3800,
sizeof(initial_coeffs_a_3800));
}
} else {
memcpy(p->coeffsA[0], initial_coeffs_3930, sizeof(initial_coeffs_3930));
memcpy(p->coeffsA[1], initial_coeffs_3930, sizeof(initial_coeffs_3930));
memcpy(p64->coeffsA[0], initial_coeffs_3930_64bit, sizeof(initial_coeffs_3930_64bit));
memcpy(p64->coeffsA[1], initial_coeffs_3930_64bit, sizeof(initial_coeffs_3930_64bit));
}
memset(p->coeffsB, 0, sizeof(p->coeffsB));
memset(p64->coeffsB, 0, sizeof(p64->coeffsB));
if (ctx->fileversion < 3930) {
memcpy(p->coeffsB[0], initial_coeffs_b_3800,
sizeof(initial_coeffs_b_3800));
memcpy(p->coeffsB[1], initial_coeffs_b_3800,
sizeof(initial_coeffs_b_3800));
}
p->filterA[0] = p->filterA[1] = 0;
p->filterB[0] = p->filterB[1] = 0;
p->lastA[0] = p->lastA[1] = 0;
p64->filterA[0] = p64->filterA[1] = 0;
p64->filterB[0] = p64->filterB[1] = 0;
p64->lastA[0] = p64->lastA[1] = 0;
p->sample_pos = 0;
p64->sample_pos = 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 filter_fast_3320(APEPredictor *p,
const int decoded, const int filter,
const int delayA)
{
int32_t predictionA;
p->buf[delayA] = p->lastA[filter];
if (p->sample_pos < 3) {
p->lastA[filter] = decoded;
p->filterA[filter] = decoded;
return decoded;
}
predictionA = p->buf[delayA] * 2U - p->buf[delayA - 1];
p->lastA[filter] = decoded + (unsigned)((int32_t)(predictionA * p->coeffsA[filter][0]) >> 9);
if ((decoded ^ predictionA) > 0)
p->coeffsA[filter][0]++;
else
p->coeffsA[filter][0]--;
p->filterA[filter] += (unsigned)p->lastA[filter];
return p->filterA[filter];
}
static av_always_inline int filter_3800(APEPredictor *p,
const unsigned decoded, const int filter,
const int delayA, const int delayB,
const int start, const int shift)
{
int32_t predictionA, predictionB, sign;
int32_t d0, d1, d2, d3, d4;
p->buf[delayA] = p->lastA[filter];
p->buf[delayB] = p->filterB[filter];
if (p->sample_pos < start) {
predictionA = decoded + p->filterA[filter];
p->lastA[filter] = decoded;
p->filterB[filter] = decoded;
p->filterA[filter] = predictionA;
return predictionA;
}
d2 = p->buf[delayA];
d1 = (p->buf[delayA] - (unsigned)p->buf[delayA - 1]) * 2;
d0 = p->buf[delayA] + ((p->buf[delayA - 2] - (unsigned)p->buf[delayA - 1]) * 8);
d3 = p->buf[delayB] * 2U - p->buf[delayB - 1];
d4 = p->buf[delayB];
predictionA = d0 * p->coeffsA[filter][0] +
d1 * p->coeffsA[filter][1] +
d2 * p->coeffsA[filter][2];
sign = APESIGN(decoded);
p->coeffsA[filter][0] += (((d0 >> 30) & 2) - 1) * sign;
p->coeffsA[filter][1] += (((d1 >> 28) & 8) - 4) * sign;
p->coeffsA[filter][2] += (((d2 >> 28) & 8) - 4) * sign;
predictionB = d3 * p->coeffsB[filter][0] -
d4 * p->coeffsB[filter][1];
p->lastA[filter] = decoded + (predictionA >> 11);
sign = APESIGN(p->lastA[filter]);
p->coeffsB[filter][0] += (((d3 >> 29) & 4) - 2) * sign;
p->coeffsB[filter][1] -= (((d4 >> 30) & 2) - 1) * sign;
p->filterB[filter] = p->lastA[filter] + (predictionB >> shift);
p->filterA[filter] = p->filterB[filter] + (unsigned)((int)(p->filterA[filter] * 31U) >> 5);
return p->filterA[filter];
}
static void long_filter_high_3800(int32_t *buffer, int order, int shift, int length)
{
int i, j;
int32_t dotprod, sign;
int32_t coeffs[256], delay[256];
if (order >= length)
return;
memset(coeffs, 0, order * sizeof(*coeffs));
for (i = 0; i < order; i++)
delay[i] = buffer[i];
for (i = order; i < length; i++) {
dotprod = 0;
sign = APESIGN(buffer[i]);
for (j = 0; j < order; j++) {
dotprod += delay[j] * (unsigned)coeffs[j];
coeffs[j] += ((delay[j] >> 31) | 1) * sign;
}
buffer[i] -= (unsigned)(dotprod >> shift);
for (j = 0; j < order - 1; j++)
delay[j] = delay[j + 1];
delay[order - 1] = buffer[i];
}
}
static void long_filter_ehigh_3830(int32_t *buffer, int length)
{
int i, j;
int32_t dotprod, sign;
int32_t delay[8] = { 0 };
uint32_t coeffs[8] = { 0 };
for (i = 0; i < length; i++) {
dotprod = 0;
sign = APESIGN(buffer[i]);
for (j = 7; j >= 0; j--) {
dotprod += delay[j] * coeffs[j];
coeffs[j] += ((delay[j] >> 31) | 1) * sign;
}
for (j = 7; j > 0; j--)
delay[j] = delay[j - 1];
delay[0] = buffer[i];
buffer[i] -= (unsigned)(dotprod >> 9);
}
}
static void predictor_decode_stereo_3800(APEContext *ctx, int count)
{
APEPredictor *p = &ctx->predictor;
int32_t *decoded0 = ctx->decoded[0];
int32_t *decoded1 = ctx->decoded[1];
int start = 4, shift = 10;
if (ctx->compression_level == COMPRESSION_LEVEL_HIGH) {
start = 16;
long_filter_high_3800(decoded0, 16, 9, count);
long_filter_high_3800(decoded1, 16, 9, count);
} else if (ctx->compression_level == COMPRESSION_LEVEL_EXTRA_HIGH) {
int order = 128, shift2 = 11;
if (ctx->fileversion >= 3830) {
order <<= 1;
shift++;
shift2++;
long_filter_ehigh_3830(decoded0 + order, count - order);
long_filter_ehigh_3830(decoded1 + order, count - order);
}
start = order;
long_filter_high_3800(decoded0, order, shift2, count);
long_filter_high_3800(decoded1, order, shift2, count);
}
while (count--) {
int X = *decoded0, Y = *decoded1;
if (ctx->compression_level == COMPRESSION_LEVEL_FAST) {
*decoded0 = filter_fast_3320(p, Y, 0, YDELAYA);
decoded0++;
*decoded1 = filter_fast_3320(p, X, 1, XDELAYA);
decoded1++;
} else {
*decoded0 = filter_3800(p, Y, 0, YDELAYA, YDELAYB,
start, shift);
decoded0++;
*decoded1 = filter_3800(p, X, 1, XDELAYA, XDELAYB,
start, shift);
decoded1++;
}
/* Combined */
p->buf++;
p->sample_pos++;
/* Have we filled the history buffer? */
if (p->buf == p->historybuffer + HISTORY_SIZE) {
memmove(p->historybuffer, p->buf,
PREDICTOR_SIZE * sizeof(*p->historybuffer));
p->buf = p->historybuffer;
}
}
}
static void predictor_decode_mono_3800(APEContext *ctx, int count)
{
APEPredictor *p = &ctx->predictor;
int32_t *decoded0 = ctx->decoded[0];
int start = 4, shift = 10;
if (ctx->compression_level == COMPRESSION_LEVEL_HIGH) {
start = 16;
long_filter_high_3800(decoded0, 16, 9, count);
} else if (ctx->compression_level == COMPRESSION_LEVEL_EXTRA_HIGH) {
int order = 128, shift2 = 11;
if (ctx->fileversion >= 3830) {
order <<= 1;
shift++;
shift2++;
long_filter_ehigh_3830(decoded0 + order, count - order);
}
start = order;
long_filter_high_3800(decoded0, order, shift2, count);
}
while (count--) {
if (ctx->compression_level == COMPRESSION_LEVEL_FAST) {
*decoded0 = filter_fast_3320(p, *decoded0, 0, YDELAYA);
decoded0++;
} else {
*decoded0 = filter_3800(p, *decoded0, 0, YDELAYA, YDELAYB,
start, shift);
decoded0++;
}
/* Combined */
p->buf++;
p->sample_pos++;
/* Have we filled the history buffer? */
if (p->buf == p->historybuffer + HISTORY_SIZE) {
memmove(p->historybuffer, p->buf,
PREDICTOR_SIZE * sizeof(*p->historybuffer));
p->buf = p->historybuffer;
}
}
}
static av_always_inline int predictor_update_3930(APEPredictor *p,
const int decoded, const int filter,
const int delayA)
{
int32_t predictionA, sign;
uint32_t d0, d1, d2, d3;
p->buf[delayA] = p->lastA[filter];
d0 = p->buf[delayA ];
d1 = p->buf[delayA ] - (unsigned)p->buf[delayA - 1];
d2 = p->buf[delayA - 1] - (unsigned)p->buf[delayA - 2];
d3 = p->buf[delayA - 2] - (unsigned)p->buf[delayA - 3];
predictionA = d0 * p->coeffsA[filter][0] +
d1 * p->coeffsA[filter][1] +
d2 * p->coeffsA[filter][2] +
d3 * p->coeffsA[filter][3];
p->lastA[filter] = decoded + (predictionA >> 9);
p->filterA[filter] = p->lastA[filter] + ((int)(p->filterA[filter] * 31U) >> 5);
sign = APESIGN(decoded);
p->coeffsA[filter][0] += (((int32_t)d0 < 0) * 2 - 1) * sign;
p->coeffsA[filter][1] += (((int32_t)d1 < 0) * 2 - 1) * sign;
p->coeffsA[filter][2] += (((int32_t)d2 < 0) * 2 - 1) * sign;
p->coeffsA[filter][3] += (((int32_t)d3 < 0) * 2 - 1) * sign;
return p->filterA[filter];
}
static void predictor_decode_stereo_3930(APEContext *ctx, int count)
{
APEPredictor *p = &ctx->predictor;
int32_t *decoded0 = ctx->decoded[0];
int32_t *decoded1 = ctx->decoded[1];
ape_apply_filters(ctx, ctx->decoded[0], ctx->decoded[1], count);
while (count--) {
/* Predictor Y */
int Y = *decoded1, X = *decoded0;
*decoded0 = predictor_update_3930(p, Y, 0, YDELAYA);
decoded0++;
*decoded1 = predictor_update_3930(p, X, 1, XDELAYA);
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(*p->historybuffer));
p->buf = p->historybuffer;
}
}
}
static void predictor_decode_mono_3930(APEContext *ctx, int count)
{
APEPredictor *p = &ctx->predictor;
int32_t *decoded0 = ctx->decoded[0];
ape_apply_filters(ctx, ctx->decoded[0], NULL, count);
while (count--) {
*decoded0 = predictor_update_3930(p, *decoded0, 0, YDELAYA);
decoded0++;
p->buf++;
/* Have we filled the history buffer? */
if (p->buf == p->historybuffer + HISTORY_SIZE) {
memmove(p->historybuffer, p->buf,
PREDICTOR_SIZE * sizeof(*p->historybuffer));
p->buf = p->historybuffer;
}
}
}
static av_always_inline int predictor_update_filter(APEPredictor64 *p,
const int decoded, const int filter,
const int delayA, const int delayB,
const int adaptA, const int adaptB)
{
int64_t predictionA, predictionB;
int32_t sign;
p->buf[delayA] = p->lastA[filter];
p->buf[adaptA] = APESIGN(p->buf[delayA]);
p->buf[delayA - 1] = p->buf[delayA] - (uint64_t)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] - ((int64_t)(p->filterB[filter] * 31ULL) >> 5);
p->buf[adaptB] = APESIGN(p->buf[delayB]);
p->buf[delayB - 1] = p->buf[delayB] - (uint64_t)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 + ((int64_t)((uint64_t)predictionA + (predictionB >> 1)) >> 10);
p->filterA[filter] = p->lastA[filter] + ((int64_t)(p->filterA[filter] * 31ULL) >> 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_3950(APEContext *ctx, int count)
{
APEPredictor64 *p = &ctx->predictor64;
int32_t *decoded0 = ctx->decoded[0];
int32_t *decoded1 = ctx->decoded[1];
ape_apply_filters(ctx, ctx->decoded[0], ctx->decoded[1], count);
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(*p->historybuffer));
p->buf = p->historybuffer;
}
}
}
static void predictor_decode_mono_3950(APEContext *ctx, int count)
{
APEPredictor64 *p = &ctx->predictor64;
int32_t *decoded0 = ctx->decoded[0];
int32_t predictionA, currentA, A, sign;
ape_apply_filters(ctx, ctx->decoded[0], NULL, count);
currentA = p->lastA[0];
while (count--) {
A = *decoded0;
p->buf[YDELAYA] = currentA;
p->buf[YDELAYA - 1] = p->buf[YDELAYA] - (uint64_t)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 + (uint64_t)(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(*p->historybuffer));
p->buf = p->historybuffer;
}
p->filterA[0] = currentA + (uint64_t)((int64_t)(p->filterA[0] * 31U) >> 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(*f->historybuffer));
memset(f->coeffs, 0, order * sizeof(*f->coeffs));
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;
unsigned absres;
while (count--) {
/* round fixedpoint scalar product */
res = ctx->adsp.scalarproduct_and_madd_int16(f->coeffs,
f->delay - order,
f->adaptcoeffs - order,
order, APESIGN(*data));
res = (int64_t)(res + (1LL << (fracbits - 1))) >> fracbits;
res += (unsigned)*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 = FFABSU(res);
if (absres)
*f->adaptcoeffs = APESIGN(res) *
(8 << ((absres > f->avg * 3LL) + (absres > (f->avg + f->avg / 3))));
/* equivalent to the following code
if (absres <= f->avg * 4 / 3)
*f->adaptcoeffs = APESIGN(res) * 8;
else if (absres <= f->avg * 3)
*f->adaptcoeffs = APESIGN(res) * 16;
else
*f->adaptcoeffs = APESIGN(res) * 32;
*/
else
*f->adaptcoeffs = 0;
f->avg += (int)(absres - (unsigned)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(*f->historybuffer));
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 int init_frame_decoder(APEContext *ctx)
{
int i, ret;
if ((ret = init_entropy_decoder(ctx)) < 0)
return ret;
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]);
}
return 0;
}
static void ape_unpack_mono(APEContext *ctx, int count)
{
if (ctx->frameflags & APE_FRAMECODE_STEREO_SILENCE) {
/* We are pure silence, so we're done. */
av_log(ctx->avctx, AV_LOG_DEBUG, "pure silence mono\n");
return;
}
ctx->entropy_decode_mono(ctx, count);
if (ctx->error)
return;
/* Now apply the predictor decoding */
ctx->predictor_decode_mono(ctx, count);
/* Pseudo-stereo - just copy left channel to right channel */
if (ctx->channels == 2) {
memcpy(ctx->decoded[1], ctx->decoded[0], count * sizeof(*ctx->decoded[1]));
}
}
static void ape_unpack_stereo(APEContext *ctx, int count)
{
unsigned left, right;
int32_t *decoded0 = ctx->decoded[0];
int32_t *decoded1 = ctx->decoded[1];
if ((ctx->frameflags & APE_FRAMECODE_STEREO_SILENCE) == APE_FRAMECODE_STEREO_SILENCE) {
/* We are pure silence, so we're done. */
av_log(ctx->avctx, AV_LOG_DEBUG, "pure silence stereo\n");
return;
}
ctx->entropy_decode_stereo(ctx, count);
if (ctx->error)
return;
/* Now apply the predictor decoding */
ctx->predictor_decode_stereo(ctx, count);
/* Decorrelate and scale to output depth */
while (count--) {
left = *decoded1 - (unsigned)(*decoded0 / 2);
right = left + *decoded0;
*(decoded0++) = left;
*(decoded1++) = right;
}
}
static int ape_decode_frame(AVCodecContext *avctx, AVFrame *frame,
int *got_frame_ptr, AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
APEContext *s = avctx->priv_data;
uint8_t *sample8;
int16_t *sample16;
int32_t *sample24;
int i, ch, ret;
int blockstodecode;
uint64_t decoded_buffer_size;
/* this should never be negative, but bad things will happen if it is, so
check it just to make sure. */
av_assert0(s->samples >= 0);
if(!s->samples){
uint32_t nblocks, offset;
int buf_size;
if (!avpkt->size) {
*got_frame_ptr = 0;
return 0;
}
if (avpkt->size < 8) {
av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
return AVERROR_INVALIDDATA;
}
buf_size = avpkt->size & ~3;
if (buf_size != avpkt->size) {
av_log(avctx, AV_LOG_WARNING, "packet size is not a multiple of 4. "
"extra bytes at the end will be skipped.\n");
}
if (s->fileversion < 3950) // previous versions overread two bytes
buf_size += 2;
av_fast_padded_malloc(&s->data, &s->data_size, buf_size);
if (!s->data)
return AVERROR(ENOMEM);
s->bdsp.bswap_buf((uint32_t *) s->data, (const uint32_t *) buf,
buf_size >> 2);
memset(s->data + (buf_size & ~3), 0, buf_size & 3);
s->ptr = s->data;
s->data_end = s->data + buf_size;
nblocks = bytestream_get_be32(&s->ptr);
offset = bytestream_get_be32(&s->ptr);
if (s->fileversion >= 3900) {
if (offset > 3) {
av_log(avctx, AV_LOG_ERROR, "Incorrect offset passed\n");
av_freep(&s->data);
s->data_size = 0;
return AVERROR_INVALIDDATA;
}
if (s->data_end - s->ptr < offset) {
av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
return AVERROR_INVALIDDATA;
}
s->ptr += offset;
} else {
if ((ret = init_get_bits8(&s->gb, s->ptr, s->data_end - s->ptr)) < 0)
return ret;
if (s->fileversion > 3800)
skip_bits_long(&s->gb, offset * 8);
else
skip_bits_long(&s->gb, offset);
}
if (!nblocks || nblocks > INT_MAX / 2 / sizeof(*s->decoded_buffer) - 8) {
av_log(avctx, AV_LOG_ERROR, "Invalid sample count: %"PRIu32".\n",
nblocks);
return AVERROR_INVALIDDATA;
}
/* Initialize the frame decoder */
if (init_frame_decoder(s) < 0) {
av_log(avctx, AV_LOG_ERROR, "Error reading frame header\n");
return AVERROR_INVALIDDATA;
}
s->samples = nblocks;
}
if (!s->data) {
*got_frame_ptr = 0;
return avpkt->size;
}
blockstodecode = FFMIN(s->blocks_per_loop, s->samples);
// for old files coefficients were not interleaved,
// so we need to decode all of them at once
if (s->fileversion < 3930)
blockstodecode = s->samples;
/* reallocate decoded sample buffer if needed */
decoded_buffer_size = 2LL * FFALIGN(blockstodecode, 8) * sizeof(*s->decoded_buffer);
av_assert0(decoded_buffer_size <= INT_MAX);
/* get output buffer */
frame->nb_samples = blockstodecode;
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
s->samples=0;
return ret;
}
av_fast_malloc(&s->decoded_buffer, &s->decoded_size, decoded_buffer_size);
if (!s->decoded_buffer)
return AVERROR(ENOMEM);
memset(s->decoded_buffer, 0, decoded_buffer_size);
s->decoded[0] = s->decoded_buffer;
s->decoded[1] = s->decoded_buffer + FFALIGN(blockstodecode, 8);
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->samples=0;
av_log(avctx, AV_LOG_ERROR, "Error decoding frame\n");
return AVERROR_INVALIDDATA;
}
switch (s->bps) {
case 8:
for (ch = 0; ch < s->channels; ch++) {
sample8 = (uint8_t *)frame->data[ch];
for (i = 0; i < blockstodecode; i++)
*sample8++ = (s->decoded[ch][i] + 0x80U) & 0xff;
}
break;
case 16:
for (ch = 0; ch < s->channels; ch++) {
sample16 = (int16_t *)frame->data[ch];
for (i = 0; i < blockstodecode; i++)
*sample16++ = s->decoded[ch][i];
}
break;
case 24:
for (ch = 0; ch < s->channels; ch++) {
sample24 = (int32_t *)frame->data[ch];
for (i = 0; i < blockstodecode; i++)
*sample24++ = s->decoded[ch][i] * 256U;
}
break;
}
s->samples -= blockstodecode;
if (avctx->err_recognition & AV_EF_CRCCHECK &&
s->fileversion >= 3900 && s->bps < 24) {
uint32_t crc = s->CRC_state;
const AVCRC *crc_tab = av_crc_get_table(AV_CRC_32_IEEE_LE);
for (i = 0; i < blockstodecode; i++) {
for (ch = 0; ch < s->channels; ch++) {
uint8_t *smp = frame->data[ch] + (i*(s->bps >> 3));
crc = av_crc(crc_tab, crc, smp, s->bps >> 3);
}
}
if (!s->samples && (~crc >> 1) ^ s->CRC) {
av_log(avctx, AV_LOG_ERROR, "CRC mismatch! Previously decoded "
"frames may have been affected as well.\n");
if (avctx->err_recognition & AV_EF_EXPLODE)
return AVERROR_INVALIDDATA;
}
s->CRC_state = crc;
}
*got_frame_ptr = 1;
return !s->samples ? avpkt->size : 0;
}
static void ape_flush(AVCodecContext *avctx)
{
APEContext *s = avctx->priv_data;
s->samples= 0;
}
#define OFFSET(x) offsetof(APEContext, x)
#define PAR (AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM)
static const AVOption options[] = {
{ "max_samples", "maximum number of samples decoded per call", OFFSET(blocks_per_loop), AV_OPT_TYPE_INT, { .i64 = 4608 }, 1, INT_MAX, PAR, "max_samples" },
{ "all", "no maximum. decode all samples for each packet at once", 0, AV_OPT_TYPE_CONST, { .i64 = INT_MAX }, INT_MIN, INT_MAX, PAR, "max_samples" },
{ NULL},
};
static const AVClass ape_decoder_class = {
.class_name = "APE decoder",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
const FFCodec ff_ape_decoder = {
.p.name = "ape",
.p.long_name = NULL_IF_CONFIG_SMALL("Monkey's Audio"),
.p.type = AVMEDIA_TYPE_AUDIO,
.p.id = AV_CODEC_ID_APE,
.priv_data_size = sizeof(APEContext),
.init = ape_decode_init,
.close = ape_decode_close,
FF_CODEC_DECODE_CB(ape_decode_frame),
.p.capabilities = AV_CODEC_CAP_SUBFRAMES | AV_CODEC_CAP_DELAY |
AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
.flush = ape_flush,
.p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_U8P,
AV_SAMPLE_FMT_S16P,
AV_SAMPLE_FMT_S32P,
AV_SAMPLE_FMT_NONE },
.p.priv_class = &ape_decoder_class,
};
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