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|
/*
DeaDBeeF - ultimate music player for GNU/Linux systems with X11
Copyright (C) 2009 Alexey Yakovenko
based on apedec from FFMpeg Copyright (c) 2007 Benjamin Zores <ben@geexbox.org>
based upon libdemac from Dave Chapman.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
/*
main changes compared to ffmpeg:
demuxer and decoder joined into 1 module
no mallocs/reallocs during decoding
streaming through fixed ringbuffer (small mem footprint)
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <string.h>
#include <limits.h>
#include <stdlib.h>
#include <assert.h>
#include "../../deadbeef.h"
#define ENABLE_DEBUG 0
#define trace(...) { fprintf(stderr, __VA_ARGS__); }
//#define trace(fmt,...)
static DB_decoder_t plugin;
static DB_functions_t *deadbeef;
//static float timestart;
//static float timeend;
static int startsample;
static int endsample;
#define PACKET_BUFFER_SIZE 100000
#define min(x,y) ((x)<(y)?(x):(y))
#define max(x,y) ((x)>(y)?(x):(y))
static inline unsigned int bytestream_get_buffer(const uint8_t **b, uint8_t *dst, unsigned int size)
{
memcpy(dst, *b, size);
(*b) += size;
return size;
}
static inline void bytestream_put_buffer(uint8_t **b, const uint8_t *src, unsigned int size)
{
memcpy(*b, src, size);
(*b) += size;
}
static inline uint8_t bytestream_get_byte (const uint8_t **ptr) {
uint8_t v = *(*ptr);
(*ptr)++;
return v;
}
static inline uint32_t bytestream_get_be32 (const uint8_t **ptr) {
const uint8_t *tmp = *ptr;
uint32_t x = tmp[3] | (tmp[2] << 8) | (tmp[1] << 16) | (tmp[0] << 24);
(*ptr) += 4;
return x;
}
#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;
/* The earliest and latest file formats supported by this library */
#define APE_MIN_VERSION 3950
#define APE_MAX_VERSION 3990
#define MAC_FORMAT_FLAG_8_BIT 1 // is 8-bit [OBSOLETE]
#define MAC_FORMAT_FLAG_CRC 2 // uses the new CRC32 error detection [OBSOLETE]
#define MAC_FORMAT_FLAG_HAS_PEAK_LEVEL 4 // uint32 nPeakLevel after the header [OBSOLETE]
#define MAC_FORMAT_FLAG_24_BIT 8 // is 24-bit [OBSOLETE]
#define MAC_FORMAT_FLAG_HAS_SEEK_ELEMENTS 16 // has the number of seek elements after the peak level
#define MAC_FORMAT_FLAG_CREATE_WAV_HEADER 32 // create the wave header on decompression (not stored)
#define MAC_SUBFRAME_SIZE 4608
#define APE_EXTRADATA_SIZE 6
typedef struct {
int64_t pos;
int nblocks;
int size;
int skip;
} APEFrame;
/** Decoder context */
typedef struct APEContext {
/* Derived fields */
uint32_t junklength;
uint32_t firstframe;
uint32_t totalsamples;
int currentframe;
APEFrame *frames;
/* Info from Descriptor Block */
char magic[4];
int16_t fileversion;
int16_t padding1;
uint32_t descriptorlength;
uint32_t headerlength;
uint32_t seektablelength;
uint32_t wavheaderlength;
uint32_t audiodatalength;
uint32_t audiodatalength_high;
uint32_t wavtaillength;
uint8_t md5[16];
/* Info from Header Block */
uint16_t compressiontype;
uint16_t formatflags;
uint32_t blocksperframe;
uint32_t finalframeblocks;
uint32_t totalframes;
uint16_t bps;
uint16_t channels;
uint32_t samplerate;
int samples; ///< samples left to decode in current frame
/* Seektable */
uint32_t *seektable;
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_end; ///< frame data end
const uint8_t *ptr; ///< current position in frame data
const uint8_t *last_ptr;
uint8_t packet_data[PACKET_BUFFER_SIZE];
int packet_remaining; // number of bytes in packet_data
int packet_sizeleft; // number of bytes left unread for current ape frame
int samplestoskip;
int currentsample; // current sample from beginning of file
uint8_t buffer[BLOCKS_PER_LOOP * 2 * 2 * 2];
int remaining;
int error;
} APEContext;
APEContext ape_ctx;
inline static int
read_uint16(DB_FILE *fp, uint16_t* x)
{
unsigned char tmp[2];
int n;
n = deadbeef->fread(tmp, 1, 2, fp);
if (n != 2)
return -1;
*x = tmp[0] | (tmp[1] << 8);
return 0;
}
inline static int
read_int16(DB_FILE *fp, int16_t* x)
{
return read_uint16(fp, (uint16_t*)x);
}
inline static int
read_uint32(DB_FILE *fp, uint32_t* x)
{
unsigned char tmp[4];
int n;
n = deadbeef->fread(tmp, 1, 4, fp);
if (n != 4)
return -1;
*x = tmp[0] | (tmp[1] << 8) | (tmp[2] << 16) | (tmp[3] << 24);
return 0;
}
static void ape_dumpinfo(APEContext * ape_ctx)
{
#if ENABLE_DEBUG
int i;
fprintf (stderr, "Descriptor Block:\n\n");
fprintf (stderr, "magic = \"%c%c%c%c\"\n", ape_ctx->magic[0], ape_ctx->magic[1], ape_ctx->magic[2], ape_ctx->magic[3]);
fprintf (stderr, "fileversion = %d\n", ape_ctx->fileversion);
fprintf (stderr, "descriptorlength = %d\n", ape_ctx->descriptorlength);
fprintf (stderr, "headerlength = %d\n", ape_ctx->headerlength);
fprintf (stderr, "seektablelength = %d\n", ape_ctx->seektablelength);
fprintf (stderr, "wavheaderlength = %d\n", ape_ctx->wavheaderlength);
fprintf (stderr, "audiodatalength = %d\n", ape_ctx->audiodatalength);
fprintf (stderr, "audiodatalength_high = %d\n", ape_ctx->audiodatalength_high);
fprintf (stderr, "wavtaillength = %d\n", ape_ctx->wavtaillength);
fprintf (stderr, "md5 = ");
for (i = 0; i < 16; i++)
fprintf (stderr, "%02x", ape_ctx->md5[i]);
fprintf (stderr, "\n");
fprintf (stderr, "\nHeader Block:\n\n");
fprintf (stderr, "compressiontype = %d\n", ape_ctx->compressiontype);
fprintf (stderr, "formatflags = %d\n", ape_ctx->formatflags);
fprintf (stderr, "blocksperframe = %d\n", ape_ctx->blocksperframe);
fprintf (stderr, "finalframeblocks = %d\n", ape_ctx->finalframeblocks);
fprintf (stderr, "totalframes = %d\n", ape_ctx->totalframes);
fprintf (stderr, "bps = %d\n", ape_ctx->bps);
fprintf (stderr, "channels = %d\n", ape_ctx->channels);
fprintf (stderr, "samplerate = %d\n", ape_ctx->samplerate);
fprintf (stderr, "\nSeektable\n\n");
if ((ape_ctx->seektablelength / sizeof(uint32_t)) != ape_ctx->totalframes) {
fprintf (stderr, "No seektable\n");
} else {
for (i = 0; i < ape_ctx->seektablelength / sizeof(uint32_t); i++) {
if (i < ape_ctx->totalframes - 1) {
fprintf (stderr, "%8d %d (%d bytes)\n", i, ape_ctx->seektable[i], ape_ctx->seektable[i + 1] - ape_ctx->seektable[i]);
} else {
fprintf (stderr, "%8d %d\n", i, ape_ctx->seektable[i]);
}
}
}
fprintf (stderr, "\nFrames\n\n");
for (i = 0; i < ape_ctx->totalframes; i++)
fprintf (stderr, "%8d %8lld %8d (%d samples)\n", i, ape_ctx->frames[i].pos, ape_ctx->frames[i].size, ape_ctx->frames[i].nblocks);
fprintf (stderr, "\nCalculated information:\n\n");
fprintf (stderr, "junklength = %d\n", ape_ctx->junklength);
fprintf (stderr, "firstframe = %d\n", ape_ctx->firstframe);
fprintf (stderr, "totalsamples = %d\n", ape_ctx->totalsamples);
#endif
}
static int
ape_read_header(DB_FILE *fp, APEContext *ape)
{
int i;
int total_blocks;
/* TODO: Skip any leading junk such as id3v2 tags */
ape->junklength = 0;
if (deadbeef->fread (ape->magic, 1, 4, fp) != 4) {
return -1;
}
if (memcmp (ape->magic, "MAC ", 4))
return -1;
if (read_uint16 (fp, &ape->fileversion) < 0) {
return -1;
}
if (ape->fileversion < APE_MIN_VERSION || ape->fileversion > APE_MAX_VERSION) {
fprintf (stderr, "Unsupported file version - %d.%02d\n", ape->fileversion / 1000, (ape->fileversion % 1000) / 10);
return -1;
}
if (ape->fileversion >= 3980) {
if (read_uint16 (fp, &ape->padding1) < 0) {
return -1;
}
if (read_uint32 (fp, &ape->descriptorlength) < 0) {
return -1;
}
if (read_uint32 (fp, &ape->headerlength) < 0) {
return -1;
}
if (read_uint32 (fp, &ape->seektablelength) < 0) {
return -1;
}
if (read_uint32 (fp, &ape->wavheaderlength) < 0) {
return -1;
}
if (read_uint32 (fp, &ape->audiodatalength) < 0) {
return -1;
}
if (read_uint32 (fp, &ape->audiodatalength_high) < 0) {
return -1;
}
if (read_uint32 (fp, &ape->wavtaillength) < 0) {
return -1;
}
if (deadbeef->fread (ape->md5, 1, 16, fp) != 16) {
return -1;
}
/* Skip any unknown bytes at the end of the descriptor.
This is for future compatibility */
if (ape->descriptorlength > 52) {
deadbeef->fseek (fp, ape->descriptorlength - 52, SEEK_CUR);
}
/* Read header data */
if (read_uint16 (fp, &ape->compressiontype) < 0) {
return -1;
}
if (read_uint16 (fp, &ape->formatflags) < 0) {
return -1;
}
if (read_uint32 (fp, &ape->blocksperframe) < 0) {
return -1;
}
if (read_uint32 (fp, &ape->finalframeblocks) < 0) {
return -1;
}
if (read_uint32 (fp, & ape->totalframes) < 0) {
return -1;
}
if (read_uint16 (fp, &ape->bps) < 0) {
return -1;
}
if (read_uint16 (fp, &ape->channels) < 0) {
return -1;
}
if (read_uint32 (fp, &ape->samplerate) < 0) {
return -1;
}
} else {
ape->descriptorlength = 0;
ape->headerlength = 32;
if (read_uint16 (fp, &ape->compressiontype) < 0) {
return -1;
}
if (read_uint16 (fp, &ape->formatflags) < 0) {
return -1;
}
if (read_uint16 (fp, &ape->channels) < 0) {
return -1;
}
if (read_uint32 (fp, &ape->samplerate) < 0) {
return -1;
}
if (read_uint32 (fp, &ape->wavheaderlength) < 0) {
return -1;
}
if (read_uint32 (fp, &ape->wavtaillength) < 0) {
return -1;
}
if (read_uint32 (fp, &ape->totalframes) < 0) {
return -1;
}
if (read_uint32 (fp, &ape->finalframeblocks) < 0) {
return -1;
}
if (ape->formatflags & MAC_FORMAT_FLAG_HAS_PEAK_LEVEL) {
deadbeef->fseek(fp, 4, SEEK_CUR); /* Skip the peak level */
ape->headerlength += 4;
}
if (ape->formatflags & MAC_FORMAT_FLAG_HAS_SEEK_ELEMENTS) {
if (read_uint32 (fp, &ape->seektablelength) < 0) {
return -1;
};
ape->headerlength += 4;
ape->seektablelength *= sizeof(int32_t);
} else
ape->seektablelength = ape->totalframes * sizeof(int32_t);
if (ape->formatflags & MAC_FORMAT_FLAG_8_BIT)
ape->bps = 8;
else if (ape->formatflags & MAC_FORMAT_FLAG_24_BIT)
ape->bps = 24;
else
ape->bps = 16;
if (ape->fileversion >= 3950)
ape->blocksperframe = 73728 * 4;
else if (ape->fileversion >= 3900 || (ape->fileversion >= 3800 && ape->compressiontype >= 4000))
ape->blocksperframe = 73728;
else
ape->blocksperframe = 9216;
/* Skip any stored wav header */
if (!(ape->formatflags & MAC_FORMAT_FLAG_CREATE_WAV_HEADER)) {
deadbeef->fseek (fp, ape->wavheaderlength, SEEK_CUR);
}
}
if(ape->totalframes > UINT_MAX / sizeof(APEFrame)){
fprintf (stderr, "Too many frames: %d\n", ape->totalframes);
return -1;
}
ape->frames = malloc(ape->totalframes * sizeof(APEFrame));
if(!ape->frames)
return -1;
ape->firstframe = ape->junklength + ape->descriptorlength + ape->headerlength + ape->seektablelength + ape->wavheaderlength;
ape->currentframe = 0;
ape->totalsamples = ape->finalframeblocks;
if (ape->totalframes > 1)
ape->totalsamples += ape->blocksperframe * (ape->totalframes - 1);
if (ape->seektablelength > 0) {
ape->seektable = malloc(ape->seektablelength);
for (i = 0; i < ape->seektablelength / sizeof(uint32_t); i++) {
if (read_uint32 (fp, &ape->seektable[i]) < 0) {
return -1;
}
}
}
ape->frames[0].pos = ape->firstframe;
ape->frames[0].nblocks = ape->blocksperframe;
ape->frames[0].skip = 0;
for (i = 1; i < ape->totalframes; i++) {
ape->frames[i].pos = ape->seektable[i]; //ape->frames[i-1].pos + ape->blocksperframe;
ape->frames[i].nblocks = ape->blocksperframe;
ape->frames[i - 1].size = ape->frames[i].pos - ape->frames[i - 1].pos;
ape->frames[i].skip = (ape->frames[i].pos - ape->frames[0].pos) & 3;
}
ape->frames[ape->totalframes - 1].size = ape->finalframeblocks * 4;
ape->frames[ape->totalframes - 1].nblocks = ape->finalframeblocks;
for (i = 0; i < ape->totalframes; i++) {
if(ape->frames[i].skip){
ape->frames[i].pos -= ape->frames[i].skip;
ape->frames[i].size += ape->frames[i].skip;
}
ape->frames[i].size = (ape->frames[i].size + 3) & ~3;
}
ape_dumpinfo(ape);
#if ENABLE_DEBUG
fprintf (stderr, "Decoding file - v%d.%02d, compression level %d\n", ape->fileversion / 1000, (ape->fileversion % 1000) / 10, ape->compressiontype);
#endif
total_blocks = (ape->totalframes == 0) ? 0 : ((ape->totalframes - 1) * ape->blocksperframe) + ape->finalframeblocks;
return 0;
}
# define AV_WB32(p, d) do { \
((uint8_t*)(p))[3] = (d); \
((uint8_t*)(p))[2] = (d)>>8; \
((uint8_t*)(p))[1] = (d)>>16; \
((uint8_t*)(p))[0] = (d)>>24; \
} while(0)
#define AV_WL32(p, v) AV_WB32(p, bswap_32(v))
static inline const uint32_t bswap_32(uint32_t x)
{
x= ((x<<8)&0xFF00FF00) | ((x>>8)&0x00FF00FF);
x= (x>>16) | (x<<16);
return x;
}
static int ape_read_packet(DB_FILE *fp, APEContext *ape_ctx)
{
int ret;
int nblocks;
APEContext *ape = ape_ctx;
uint32_t extra_size = 8;
if (ape->currentframe > ape->totalframes)
return -1;
// fprintf (stderr, "seeking to %d\n", ape->frames[ape->currentframe].pos);
if (deadbeef->fseek (fp, ape->frames[ape->currentframe].pos, SEEK_SET) != 0) {
return -1;
}
/* Calculate how many blocks there are in this frame */
if (ape->currentframe == (ape->totalframes - 1))
nblocks = ape->finalframeblocks;
else
nblocks = ape->blocksperframe;
// if (PACKET_MAX_SIZE < ape->frames[ape->currentframe].size + extra_size) {
// return -1;
// }
// packet_sizeleft = ape->frames[ape->currentframe].size + extra_size;
AV_WL32(ape->packet_data , nblocks);
AV_WL32(ape->packet_data + 4, ape->frames[ape->currentframe].skip);
// packet_sizeleft -= 8;
int sz = PACKET_BUFFER_SIZE-8;
sz = min (sz, ape->frames[ape->currentframe].size);
// fprintf (stderr, "readsize: %d, packetsize: %d\n", sz, ape->frames[ape->currentframe].size);
ret = deadbeef->fread (ape->packet_data + extra_size, 1, sz, fp);
ape->packet_sizeleft = ape->frames[ape->currentframe].size - sz + 8;
ape->packet_remaining = sz+8;
ape->currentframe++;
return 0;
}
static void
ape_free_ctx (APEContext *ape_ctx) {
int i;
if (ape_ctx->frames) {
free (ape_ctx->frames);
ape_ctx->frames = NULL;
}
if (ape_ctx->seektable) {
free (ape_ctx->seektable);
ape_ctx->seektable = NULL;
}
for (i = 0; i < APE_FILTER_LEVELS; i++) {
if (ape_ctx->filterbuf) {
free (ape_ctx->filterbuf[i]);
ape_ctx->filterbuf[i] = NULL;
}
}
}
static void
ffap_free (void)
{
ape_free_ctx (&ape_ctx);
}
#if 0
static int ape_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
{
AVStream *st = s->streams[stream_index];
APEContext *ape = s->priv_data;
int index = av_index_search_timestamp(st, timestamp, flags);
if (index < 0)
return -1;
ape->currentframe = index;
return 0;
}
#endif
static DB_FILE *fp;
static int
ffap_init(DB_playItem_t *it)
{
fp = deadbeef->fopen (it->fname);
if (!fp) {
return -1;
}
memset (&ape_ctx, 0, sizeof (ape_ctx));
ape_read_header (fp, &ape_ctx);
int i;
if (ape_ctx.bps != 16) {
fprintf (stderr, "Only 16-bit samples are supported\n");
return -1;
}
if (ape_ctx.channels > 2) {
fprintf (stderr, "Only mono and stereo is supported\n");
return -1;
}
#if ENABLE_DEBUG
fprintf (stderr, "Compression Level: %d - Flags: %d\n", ape_ctx.compressiontype, ape_ctx.formatflags);
#endif
if (ape_ctx.compressiontype % 1000 || ape_ctx.compressiontype > COMPRESSION_LEVEL_INSANE) {
fprintf (stderr, "Incorrect compression level %d\n", ape_ctx.compressiontype);
return -1;
}
ape_ctx.fset = ape_ctx.compressiontype / 1000 - 1;
for (i = 0; i < APE_FILTER_LEVELS; i++) {
if (!ape_filter_orders[ape_ctx.fset][i])
break;
ape_ctx.filterbuf[i] = malloc((ape_filter_orders[ape_ctx.fset][i] * 3 + HISTORY_SIZE) * 4);
}
plugin.info.bps = ape_ctx.bps;
plugin.info.samplerate = ape_ctx.samplerate;
plugin.info.channels = ape_ctx.channels;
plugin.info.readpos = 0;
if (it->endsample > 0) {
startsample = it->startsample;
endsample = it->endsample;
// timestart = it->timestart;
// timeend = it->timeend;
plugin.seek_sample (0);
//trace ("start: %d/%f, end: %d/%f\n", startsample, timestart, endsample, timeend);
}
else {
//timestart = 0;
//timeend = it->duration;
startsample = 0;
endsample = ape_ctx.totalsamples-1;
}
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);
}
base = range_decode_culfreq(ctx, pivot);
range_decode_update(ctx, 1, base);
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 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;
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);
if (!decoded) // no need updating filter coefficients
return p->filterA[filter];
if (decoded > 0) {
p->coeffsA[filter][0] -= p->buf[adaptA ];
p->coeffsA[filter][1] -= p->buf[adaptA - 1];
p->coeffsA[filter][2] -= p->buf[adaptA - 2];
p->coeffsA[filter][3] -= p->buf[adaptA - 3];
p->coeffsB[filter][0] -= p->buf[adaptB ];
p->coeffsB[filter][1] -= p->buf[adaptB - 1];
p->coeffsB[filter][2] -= p->buf[adaptB - 2];
p->coeffsB[filter][3] -= p->buf[adaptB - 3];
p->coeffsB[filter][4] -= p->buf[adaptB - 4];
} else {
p->coeffsA[filter][0] += p->buf[adaptA ];
p->coeffsA[filter][1] += p->buf[adaptA - 1];
p->coeffsA[filter][2] += p->buf[adaptA - 2];
p->coeffsA[filter][3] += p->buf[adaptA - 3];
p->coeffsB[filter][0] += p->buf[adaptB ];
p->coeffsB[filter][1] += p->buf[adaptB - 1];
p->coeffsB[filter][2] += p->buf[adaptB - 2];
p->coeffsB[filter][3] += p->buf[adaptB - 3];
p->coeffsB[filter][4] += p->buf[adaptB - 4];
}
return p->filterA[filter];
}
static void predictor_decode_stereo(APEContext * ctx, int count)
{
int32_t predictionA, predictionB;
APEPredictor *p = &ctx->predictor;
int32_t *decoded0 = ctx->decoded0;
int32_t *decoded1 = ctx->decoded1;
while (count--) {
/* Predictor Y */
predictionA = predictor_update_filter(p, *decoded0, 0, YDELAYA, YDELAYB, YADAPTCOEFFSA, YADAPTCOEFFSB);
predictionB = predictor_update_filter(p, *decoded1, 1, XDELAYA, XDELAYB, XADAPTCOEFFSA, XADAPTCOEFFSB);
*(decoded0++) = predictionA;
*(decoded1++) = predictionB;
/* 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;
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]);
if (A > 0) {
p->coeffsA[0][0] -= p->buf[YADAPTCOEFFSA ];
p->coeffsA[0][1] -= p->buf[YADAPTCOEFFSA - 1];
p->coeffsA[0][2] -= p->buf[YADAPTCOEFFSA - 2];
p->coeffsA[0][3] -= p->buf[YADAPTCOEFFSA - 3];
} else if (A < 0) {
p->coeffsA[0][0] += p->buf[YADAPTCOEFFSA ];
p->coeffsA[0][1] += p->buf[YADAPTCOEFFSA - 1];
p->coeffsA[0][2] += p->buf[YADAPTCOEFFSA - 2];
p->coeffsA[0][3] += p->buf[YADAPTCOEFFSA - 3];
}
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);
}
#ifdef HAVE_SSE2
#if ARCH_X86_64
# define REG_a "rax"
# define REG_b "rbx"
# define REG_c "rcx"
# define REG_d "rdx"
# define REG_D "rdi"
# define REG_S "rsi"
# define PTR_SIZE "8"
# define REG_SP "rsp"
# define REG_BP "rbp"
# define REGBP rbp
# define REGa rax
# define REGb rbx
# define REGc rcx
# define REGd rdx
# define REGSP rsp
typedef int64_t x86_reg;
#elif ARCH_X86_32
# define REG_a "eax"
# define REG_b "ebx"
# define REG_c "ecx"
# define REG_d "edx"
# define REG_D "edi"
# define REG_S "esi"
# define PTR_SIZE "4"
# define REG_SP "esp"
# define REG_BP "ebp"
# define REGBP ebp
# define REGa eax
# define REGb ebx
# define REGc ecx
# define REGd edx
# define REGSP esp
typedef int32_t x86_reg;
#else
#warning unknown arch
typedef int x86_reg;
#endif
typedef struct { uint64_t a, b; } xmm_reg;
#define DECLARE_ALIGNED(n,t,v) t v __attribute__ ((aligned (n)))
#define DECLARE_ALIGNED_16(t, v) DECLARE_ALIGNED(16, t, v)
static int32_t scalarproduct_int16_sse2 (int16_t * v1, int16_t * v2, int order, int shift)
{
int res = 0;
DECLARE_ALIGNED_16(xmm_reg, sh);
x86_reg o = -(order << 1);
v1 += order;
v2 += order;
sh.a = shift;
__asm__ volatile(
"pxor %%xmm7, %%xmm7 \n\t"
"1: \n\t"
"movdqu (%0,%3), %%xmm0 \n\t"
"movdqu 16(%0,%3), %%xmm1 \n\t"
"pmaddwd (%1,%3), %%xmm0 \n\t"
"pmaddwd 16(%1,%3), %%xmm1 \n\t"
"paddd %%xmm0, %%xmm7 \n\t"
"paddd %%xmm1, %%xmm7 \n\t"
"add $32, %3 \n\t"
"js 1b \n\t"
"movhlps %%xmm7, %%xmm2 \n\t"
"paddd %%xmm2, %%xmm7 \n\t"
"psrad %4, %%xmm7 \n\t"
"pshuflw $0x4E, %%xmm7,%%xmm2 \n\t"
"paddd %%xmm2, %%xmm7 \n\t"
"movd %%xmm7, %2 \n\t"
: "+r"(v1), "+r"(v2), "=r"(res), "+r"(o)
: "m"(sh)
);
return res;
}
static void add_int16_sse2(int16_t * v1, int16_t * v2, int order)
{
x86_reg o = -(order << 1);
v1 += order;
v2 += order;
__asm__ volatile(
"1: \n\t"
"movdqu (%1,%2), %%xmm0 \n\t"
"movdqu 16(%1,%2), %%xmm1 \n\t"
"paddw (%0,%2), %%xmm0 \n\t"
"paddw 16(%0,%2), %%xmm1 \n\t"
"movdqa %%xmm0, (%0,%2) \n\t"
"movdqa %%xmm1, 16(%0,%2) \n\t"
"add $32, %2 \n\t"
"js 1b \n\t"
: "+r"(v1), "+r"(v2), "+r"(o)
);
}
static void sub_int16_sse2(int16_t * v1, int16_t * v2, int order)
{
x86_reg o = -(order << 1);
v1 += order;
v2 += order;
__asm__ volatile(
"1: \n\t"
"movdqa (%0,%2), %%xmm0 \n\t"
"movdqa 16(%0,%2), %%xmm2 \n\t"
"movdqu (%1,%2), %%xmm1 \n\t"
"movdqu 16(%1,%2), %%xmm3 \n\t"
"psubw %%xmm1, %%xmm0 \n\t"
"psubw %%xmm3, %%xmm2 \n\t"
"movdqa %%xmm0, (%0,%2) \n\t"
"movdqa %%xmm2, 16(%0,%2) \n\t"
"add $32, %2 \n\t"
"js 1b \n\t"
: "+r"(v1), "+r"(v2), "+r"(o)
);
}
#endif
static int32_t
scalarproduct_int16_c(int16_t * v1, int16_t * v2, int order, int shift)
{
int res = 0;
while (order--)
res += (*v1++ * *v2++) >> shift;
return res;
}
static void
add_int16_c (int16_t *v1/*align 16*/, int16_t *v2, int len) {
while (len--) {
*v1++ += *v2++;
}
}
static void
sub_int16_c (int16_t *v1/*align 16*/, int16_t *v2, int len) {
while (len--) {
*v1++ -= *v2++;
}
}
static int32_t
(*scalarproduct_int16)(int16_t * v1, int16_t * v2, int order, int shift);
static void
(*add_int16) (int16_t *v1/*align 16*/, int16_t *v2, int len);
static void
(*sub_int16) (int16_t *v1/*align 16*/, int16_t *v2, int len);
static inline int16_t clip_int16(int a)
{
if ((a+32768) & ~65535) return (a>>31) ^ 32767;
else return a;
}
static void bswap_buf(uint32_t *dst, const uint32_t *src, int w){
int i;
for(i=0; i+8<=w; i+=8){
dst[i+0]= bswap_32(src[i+0]);
dst[i+1]= bswap_32(src[i+1]);
dst[i+2]= bswap_32(src[i+2]);
dst[i+3]= bswap_32(src[i+3]);
dst[i+4]= bswap_32(src[i+4]);
dst[i+5]= bswap_32(src[i+5]);
dst[i+6]= bswap_32(src[i+6]);
dst[i+7]= bswap_32(src[i+7]);
}
for(;i<w; i++){
dst[i+0]= bswap_32(src[i+0]);
}
}
static inline 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 = (scalarproduct_int16(f->delay - order, f->coeffs, order, 0) + (1 << (fracbits - 1))) >> fracbits;
if (*data < 0)
add_int16(f->coeffs, f->adaptcoeffs - order, order);
else if (*data > 0)
sub_int16(f->coeffs, f->adaptcoeffs - order, order);
res += *data;
*data++ = res;
/* Update the output history */
*f->delay++ = 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 = (res < 0 ? -res : res);
if (absres > (f->avg * 3))
*f->adaptcoeffs = ((res >> 25) & 64) - 32;
else if (absres > (f->avg * 4) / 3)
*f->adaptcoeffs = ((res >> 26) & 32) - 16;
else if (absres > 0)
*f->adaptcoeffs = ((res >> 27) & 16) - 8;
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. */
fprintf (stderr, "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. */
fprintf (stderr, "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(APEContext *s, void *data, int *data_size)
{
int16_t *samples = data;
int nblocks;
int i, n;
int blockstodecode;
int bytes_used;
/* should not happen but who knows */
if (BLOCKS_PER_LOOP * 2 * s->channels > *data_size) {
fprintf (stderr, "Packet size is too big! (max is %d where you have %d)\n", *data_size, BLOCKS_PER_LOOP * 2 * s->channels);
return -1;
}
if (s->packet_remaining < PACKET_BUFFER_SIZE) {
// assert (packet_sizeleft >= 0 && packet_remaining >= 0);
// if (packet_sizeleft == 0 && packet_remaining == 0) {
if (s->samples == 0) {
if (s->currentframe == s->totalframes) {
return -1;
}
assert (!s->samples);
// fprintf (stderr, "start reading packet %d\n", ape_ctx.currentframe);
assert (s->samples == 0); // all samples from prev packet must have been read
// start new packet
if (ape_read_packet (fp, &ape_ctx) < 0) {
fprintf (stderr, "error reading packet\n");
return -1;
}
bswap_buf((uint32_t*)(s->packet_data), (const uint32_t*)(s->packet_data), s->packet_remaining >> 2);
// fprintf (stderr, "packet_sizeleft=%d packet_remaining=%d\n", packet_sizeleft, packet_remaining);
s->ptr = s->last_ptr = s->packet_data;
nblocks = s->samples = bytestream_get_be32(&s->ptr);
//fprintf (stderr, "s->samples=%d (1)\n", s->samples);
n = bytestream_get_be32(&s->ptr);
if(n < 0 || n > 3){
fprintf (stderr, "Incorrect offset passed\n");
return -1;
}
s->ptr += n;
s->currentframeblocks = nblocks;
//buf += 4;
if (s->samples <= 0) {
*data_size = 0;
bytes_used = s->packet_remaining;
goto error;
}
memset(s->decoded0, 0, sizeof(s->decoded0));
memset(s->decoded1, 0, sizeof(s->decoded1));
/* Initialize the frame decoder */
init_frame_decoder(s);
}
else {
int sz = PACKET_BUFFER_SIZE - s->packet_remaining;
sz = min (sz, s->packet_sizeleft);
sz = sz&~3;
uint8_t *p = s->packet_data + s->packet_remaining;
int r = deadbeef->fread (p, 1, sz, fp);
//if (r != s) {
// fprintf (stderr, "unexpected eof while reading ape frame\n");
// return -1;
//}
bswap_buf((uint32_t*)p, (const uint32_t*)p, r >> 2);
s->packet_sizeleft -= r;
s->packet_remaining += r;
//fprintf (stderr, "read more %d bytes for current packet, sizeleft=%d, packet_remaining=%d\n", r, packet_sizeleft, packet_remaining);
}
}
s->data_end = s->packet_data + s->packet_remaining;
if (s->packet_remaining == 0 && !s->samples) {
*data_size = 0;
return 0;
}
if (!s->packet_remaining) {
fprintf (stderr, "packetbuf is empty!!\n");
*data_size = 0;
bytes_used = s->packet_remaining;
goto error;
}
nblocks = s->samples;
blockstodecode = min(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);
if(s->error || s->ptr >= s->data_end){
s->samples=0;
if (s->error) {
fprintf (stderr, "Error decoding frame, error=%d\n", s->error);
}
else {
fprintf (stderr, "Error decoding frame, ptr > data_end\n");
}
return -1;
}
int skip = min (s->samplestoskip, blockstodecode);
i = skip;
for (; i < blockstodecode; i++) {
*samples++ = s->decoded0[i];
if(s->channels == 2) {
*samples++ = s->decoded1[i];
}
}
s->samplestoskip -= skip;
s->samples -= blockstodecode;
*data_size = (blockstodecode - skip) * 2 * s->channels;
// ape_ctx.currentsample += blockstodecode - skip;
bytes_used = s->samples ? s->ptr - s->last_ptr : s->packet_remaining;
// shift everything
error:
if (bytes_used < s->packet_remaining) {
memmove (s->packet_data, s->packet_data+bytes_used, s->packet_remaining-bytes_used);
}
s->packet_remaining -= bytes_used;
s->ptr -= bytes_used;
s->last_ptr = s->ptr;
return bytes_used;
}
static DB_playItem_t *
ffap_insert (DB_playItem_t *after, const char *fname) {
APEContext ape_ctx;
memset (&ape_ctx, 0, sizeof (ape_ctx));
DB_FILE *fp = deadbeef->fopen (fname);
if (!fp) {
return NULL;
}
if (ape_read_header (fp, &ape_ctx) < 0) {
fprintf (stderr, "failed to read ape header\n");
deadbeef->fclose (fp);
ape_free_ctx (&ape_ctx);
return NULL;
}
if ((ape_ctx.fileversion < APE_MIN_VERSION) || (ape_ctx.fileversion > APE_MAX_VERSION)) {
fprintf(stderr, "unsupported file version - %.2f\n", ape_ctx.fileversion/1000.0);
deadbeef->fclose (fp);
ape_free_ctx (&ape_ctx);
return NULL;
}
float duration = ape_ctx.totalsamples / (float)ape_ctx.samplerate;
DB_playItem_t *it;
it = deadbeef->pl_insert_cue (after, fname, &plugin, "APE", ape_ctx.totalsamples, ape_ctx.samplerate);
if (it) {
deadbeef->fclose (fp);
ape_free_ctx (&ape_ctx);
return it;
}
it = deadbeef->pl_item_alloc ();
it->decoder = &plugin;
it->fname = strdup (fname);
it->filetype = "APE";
deadbeef->pl_set_item_duration (it, duration);
int v2err = deadbeef->junk_read_id3v2 (it, fp);
int v1err = deadbeef->junk_read_id3v1 (it, fp);
if (v1err >= 0) {
deadbeef->fseek (fp, -128, SEEK_END);
}
else {
deadbeef->fseek (fp, 0, SEEK_END);
}
int apeerr = deadbeef->junk_read_ape (it, fp);
deadbeef->fclose (fp);
// embedded cue
const char *cuesheet = deadbeef->pl_find_meta (it, "cuesheet");
if (cuesheet) {
DB_playItem_t *last = deadbeef->pl_insert_cue_from_buffer (after, fname, cuesheet, strlen (cuesheet), &plugin, plugin.filetypes[0], ape_ctx.totalsamples, ape_ctx.samplerate);
if (last) {
deadbeef->pl_item_free (it);
ape_free_ctx (&ape_ctx);
return last;
}
}
deadbeef->pl_add_meta (it, "title", NULL);
after = deadbeef->pl_insert_item (after, it);
ape_free_ctx (&ape_ctx);
return after;
}
static int
ffap_read_int16 (char *buffer, int size) {
if (ape_ctx.currentsample + size / (2 * ape_ctx.channels) > endsample) {
size = (endsample - ape_ctx.currentsample + 1) * 2 * ape_ctx.channels;
trace ("size truncated to %d bytes, cursample=%d, endsample=%d, totalsamples=%d\n", size, ape_ctx.currentsample, endsample, ape_ctx.totalsamples);
if (size <= 0) {
return 0;
}
}
int inits = size;
while (size > 0) {
if (ape_ctx.remaining > 0) {
int sz = min (size, ape_ctx.remaining);
memcpy (buffer, ape_ctx.buffer, sz);
buffer += sz;
size -= sz;
if (ape_ctx.remaining > sz) {
memmove (ape_ctx.buffer, ape_ctx.buffer + sz, ape_ctx.remaining-sz);
}
ape_ctx.remaining -= sz;
continue;
}
int s = BLOCKS_PER_LOOP * 2 * 2 * 2;
assert (ape_ctx.remaining <= s/2);
s -= ape_ctx.remaining;
uint8_t *buf = ape_ctx.buffer + ape_ctx.remaining;
int n = ape_decode_frame (&ape_ctx, buf, &s);
if (n == -1) {
break;
}
ape_ctx.remaining += s;
int sz = min (size, ape_ctx.remaining);
memcpy (buffer, ape_ctx.buffer, sz);
buffer += sz;
size -= sz;
if (ape_ctx.remaining > sz) {
memmove (ape_ctx.buffer, ape_ctx.buffer + sz, ape_ctx.remaining-sz);
}
ape_ctx.remaining -= sz;
}
ape_ctx.currentsample += (inits - size) / (2 * ape_ctx.channels);
plugin.info.readpos = (ape_ctx.currentsample-startsample) / (float)plugin.info.samplerate;
return inits - size;
}
static int
ffap_seek_sample (int sample) {
sample += startsample;
trace ("seeking to %d/%d\n", sample, ape_ctx.totalsamples);
uint32_t newsample = sample;
if (newsample > ape_ctx.totalsamples) {
trace ("eof\n");
return -1;
}
int nframe = newsample / ape_ctx.blocksperframe;
if (nframe >= ape_ctx.totalframes) {
trace ("eof2\n");
return -1;
}
ape_ctx.currentframe = nframe;
ape_ctx.samplestoskip = newsample - nframe * ape_ctx.blocksperframe;
// reset decoder
ape_ctx.packet_remaining = 0;
ape_ctx.samples = 0;
ape_ctx.currentsample = newsample;
plugin.info.readpos = (float)(newsample-startsample)/ape_ctx.samplerate;
return 0;
}
static int
ffap_seek (float seconds) {
return ffap_seek_sample (seconds * plugin.info.samplerate);
}
static const char *exts[] = { "ape", NULL };
static const char *filetypes[] = { "APE", NULL };
// define plugin interface
static DB_decoder_t plugin = {
DB_PLUGIN_SET_API_VERSION
.plugin.version_major = 0,
.plugin.version_minor = 1,
.plugin.type = DB_PLUGIN_DECODER,
.plugin.name = "Monkey's Audio (APE) decoder",
.plugin.descr = "Derived from ffmpeg code by Benjamin Zores and rockbox code by Dave Chapman",
.plugin.author = "Alexey Yakovenko",
.plugin.email = "waker@users.sourceforge.net",
.plugin.website = "http://deadbeef.sf.net",
.init = ffap_init,
.free = ffap_free,
.read_int16 = ffap_read_int16,
.seek = ffap_seek,
.seek_sample = ffap_seek_sample,
.insert = ffap_insert,
.exts = exts,
.id = "ffap",
.filetypes = filetypes
};
#ifdef HAVE_SSE2
#define FF_MM_MMX 0x0001 ///< standard MMX
#define FF_MM_3DNOW 0x0004 ///< AMD 3DNOW
#define FF_MM_MMX2 0x0002 ///< SSE integer functions or AMD MMX ext
#define FF_MM_SSE 0x0008 ///< SSE functions
#define FF_MM_SSE2 0x0010 ///< PIV SSE2 functions
#define FF_MM_3DNOWEXT 0x0020 ///< AMD 3DNowExt
#define FF_MM_SSE3 0x0040 ///< Prescott SSE3 functions
#define FF_MM_SSSE3 0x0080 ///< Conroe SSSE3 functions
#define FF_MM_SSE4 0x0100 ///< Penryn SSE4.1 functions
#define FF_MM_SSE42 0x0200 ///< Nehalem SSE4.2 functions
#define FF_MM_IWMMXT 0x0100 ///< XScale IWMMXT
#define FF_MM_ALTIVEC 0x0001 ///< standard AltiVec
/* ebx saving is necessary for PIC. gcc seems unable to see it alone */
#define cpuid(index,eax,ebx,ecx,edx)\
__asm__ volatile\
("mov %%"REG_b", %%"REG_S"\n\t"\
"cpuid\n\t"\
"xchg %%"REG_b", %%"REG_S\
: "=a" (eax), "=S" (ebx),\
"=c" (ecx), "=d" (edx)\
: "0" (index));
/* Function to test if multimedia instructions are supported... */
int mm_support(void)
{
int rval = 0;
int eax, ebx, ecx, edx;
int max_std_level, max_ext_level, std_caps=0, ext_caps=0;
#if ARCH_X86_32
x86_reg a, c;
__asm__ volatile (
/* See if CPUID instruction is supported ... */
/* ... Get copies of EFLAGS into eax and ecx */
"pushfl\n\t"
"pop %0\n\t"
"mov %0, %1\n\t"
/* ... Toggle the ID bit in one copy and store */
/* to the EFLAGS reg */
"xor $0x200000, %0\n\t"
"push %0\n\t"
"popfl\n\t"
/* ... Get the (hopefully modified) EFLAGS */
"pushfl\n\t"
"pop %0\n\t"
: "=a" (a), "=c" (c)
:
: "cc"
);
if (a == c)
return 0; /* CPUID not supported */
#endif
cpuid(0, max_std_level, ebx, ecx, edx);
if(max_std_level >= 1){
cpuid(1, eax, ebx, ecx, std_caps);
if (std_caps & (1<<23))
rval |= FF_MM_MMX;
if (std_caps & (1<<25))
rval |= FF_MM_MMX2
#ifdef HAVE_SSE
| FF_MM_SSE;
if (std_caps & (1<<26))
rval |= FF_MM_SSE2;
if (ecx & 1)
rval |= FF_MM_SSE3;
if (ecx & 0x00000200 )
rval |= FF_MM_SSSE3;
if (ecx & 0x00080000 )
rval |= FF_MM_SSE4;
if (ecx & 0x00100000 )
rval |= FF_MM_SSE42;
#endif
;
}
cpuid(0x80000000, max_ext_level, ebx, ecx, edx);
if(max_ext_level >= 0x80000001){
cpuid(0x80000001, eax, ebx, ecx, ext_caps);
if (ext_caps & (1<<31))
rval |= FF_MM_3DNOW;
if (ext_caps & (1<<30))
rval |= FF_MM_3DNOWEXT;
if (ext_caps & (1<<23))
rval |= FF_MM_MMX;
if (ext_caps & (1<<22))
rval |= FF_MM_MMX2;
}
return rval;
}
#endif
DB_plugin_t *
ffap_load (DB_functions_t *api) {
// detect sse2
#ifdef HAVE_SSE2
int mm_flags = mm_support ();
if (mm_flags & FF_MM_SSE2) {
scalarproduct_int16 = scalarproduct_int16_sse2;
add_int16 = add_int16_sse2;
sub_int16 = sub_int16_sse2;
}
else {
scalarproduct_int16 = scalarproduct_int16_c;
add_int16 = add_int16_c;
sub_int16 = sub_int16_c;
}
#else
scalarproduct_int16 = scalarproduct_int16_c;
add_int16 = add_int16_c;
sub_int16 = sub_int16_c;
#endif
deadbeef = api;
return DB_PLUGIN (&plugin);
}
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