/*
* ADPCM codecs
- * Copyright (c) 2001 Fabrice Bellard.
+ * Copyright (c) 2001-2003 The ffmpeg Project
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "avcodec.h"
+#include "bitstream.h"
/**
* @file adpcm.c
* ADPCM codecs.
- * First version by Francois Revol revol@free.fr
+ * First version by Francois Revol (revol@free.fr)
+ * Fringe ADPCM codecs (e.g., DK3, DK4, Westwood)
+ * by Mike Melanson (melanson@pcisys.net)
+ * CD-ROM XA ADPCM codec by BERO
+ * EA ADPCM decoder by Robin Kay (komadori@myrealbox.com)
*
* Features and limitations:
*
* Reference documents:
- * http://www.pcisys.net/~melanson/codecs/adpcm.txt
+ * http://www.pcisys.net/~melanson/codecs/simpleaudio.html
* http://www.geocities.com/SiliconValley/8682/aud3.txt
* http://openquicktime.sourceforge.net/plugins.htm
* XAnim sources (xa_codec.c) http://www.rasnaimaging.com/people/lapus/download.html
* http://www.cs.ucla.edu/~leec/mediabench/applications.html
* SoX source code http://home.sprynet.com/~cbagwell/sox.html
+ *
+ * CD-ROM XA:
+ * http://ku-www.ss.titech.ac.jp/~yatsushi/xaadpcm.html
+ * vagpack & depack http://homepages.compuserve.de/bITmASTER32/psx-index.html
+ * readstr http://www.geocities.co.jp/Playtown/2004/
*/
#define BLKSIZE 1024
15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794, 32767
};
-/* Those are for MS-ADPCM */
+/* These are for MS-ADPCM */
/* AdaptationTable[], AdaptCoeff1[], and AdaptCoeff2[] are from libsndfile */
static const int AdaptationTable[] = {
230, 230, 230, 230, 307, 409, 512, 614,
0, -256, 0, 64, 0, -208, -232
};
+/* These are for CD-ROM XA ADPCM */
+static const int xa_adpcm_table[5][2] = {
+ { 0, 0 },
+ { 60, 0 },
+ { 115, -52 },
+ { 98, -55 },
+ { 122, -60 }
+};
+
+static int ea_adpcm_table[] = {
+ 0, 240, 460, 392, 0, 0, -208, -220, 0, 1,
+ 3, 4, 7, 8, 10, 11, 0, -1, -3, -4
+};
+
+static int ct_adpcm_table[8] = {
+ 0x00E6, 0x00E6, 0x00E6, 0x00E6,
+ 0x0133, 0x0199, 0x0200, 0x0266
+};
+
+// padded to zero where table size is less then 16
+static int swf_index_tables[4][16] = {
+ /*2*/ { -1, 2 },
+ /*3*/ { -1, -1, 2, 4 },
+ /*4*/ { -1, -1, -1, -1, 2, 4, 6, 8 },
+ /*5*/ { -1, -1, -1, -1, -1, -1, -1, -1, 1, 2, 4, 6, 8, 10, 13, 16 }
+};
+
/* end of tables */
typedef struct ADPCMChannelStatus {
int channel; /* for stereo MOVs, decode left, then decode right, then tell it's decoded */
ADPCMChannelStatus status[2];
short sample_buffer[32]; /* hold left samples while waiting for right samples */
+
+ /* SWF only */
+ int nb_bits;
+ int nb_samples;
} ADPCMContext;
/* XXX: implement encoding */
+#ifdef CONFIG_ENCODERS
static int adpcm_encode_init(AVCodecContext *avctx)
{
if (avctx->channels > 2)
return -1; /* only stereo or mono =) */
switch(avctx->codec->id) {
case CODEC_ID_ADPCM_IMA_QT:
- fprintf(stderr, "ADPCM: codec admcp_ima_qt unsupported for encoding !\n");
+ av_log(avctx, AV_LOG_ERROR, "ADPCM: codec adpcm_ima_qt unsupported for encoding !\n");
avctx->frame_size = 64; /* XXX: can multiple of avctx->channels * 64 (left and right blocks are interleaved) */
return -1;
break;
/* seems frame_size isn't taken into account... have to buffer the samples :-( */
break;
case CODEC_ID_ADPCM_MS:
- fprintf(stderr, "ADPCM: codec admcp_ms unsupported for encoding !\n");
- return -1;
+ avctx->frame_size = (BLKSIZE - 7 * avctx->channels) * 2 / avctx->channels + 2; /* each 16 bits sample gives one nibble */
+ /* and we have 7 bytes per channel overhead */
+ avctx->block_align = BLKSIZE;
break;
default:
return -1;
return nibble;
}
+static inline unsigned char adpcm_ms_compress_sample(ADPCMChannelStatus *c, short sample)
+{
+ int predictor, nibble, bias;
+
+ predictor = (((c->sample1) * (c->coeff1)) + ((c->sample2) * (c->coeff2))) / 256;
+
+ nibble= sample - predictor;
+ if(nibble>=0) bias= c->idelta/2;
+ else bias=-c->idelta/2;
+
+ nibble= (nibble + bias) / c->idelta;
+ nibble= clip(nibble, -8, 7)&0x0F;
+
+ predictor += (signed)((nibble & 0x08)?(nibble - 0x10):(nibble)) * c->idelta;
+ CLAMP_TO_SHORT(predictor);
+
+ c->sample2 = c->sample1;
+ c->sample1 = predictor;
+
+ c->idelta = (AdaptationTable[(int)nibble] * c->idelta) >> 8;
+ if (c->idelta < 16) c->idelta = 16;
+
+ return nibble;
+}
+
static int adpcm_encode_frame(AVCodecContext *avctx,
unsigned char *frame, int buf_size, void *data)
{
- int n;
+ int n, i, st;
short *samples;
unsigned char *dst;
ADPCMContext *c = avctx->priv_data;
dst = frame;
samples = (short *)data;
+ st= avctx->channels == 2;
/* n = (BLKSIZE - 4 * avctx->channels) / (2 * 8 * avctx->channels); */
switch(avctx->codec->id) {
*dst++ = 0; /* unknown */
samples++;
if (avctx->channels == 2) {
- c->status[1].prev_sample = (signed short)samples[0];
+ c->status[1].prev_sample = (signed short)samples[1];
/* c->status[1].step_index = 0; */
*dst++ = (c->status[1].prev_sample) & 0xFF;
*dst++ = (c->status[1].prev_sample >> 8) & 0xFF;
samples += 8 * avctx->channels;
}
break;
+ case CODEC_ID_ADPCM_MS:
+ for(i=0; i<avctx->channels; i++){
+ int predictor=0;
+
+ *dst++ = predictor;
+ c->status[i].coeff1 = AdaptCoeff1[predictor];
+ c->status[i].coeff2 = AdaptCoeff2[predictor];
+ }
+ for(i=0; i<avctx->channels; i++){
+ if (c->status[i].idelta < 16)
+ c->status[i].idelta = 16;
+
+ *dst++ = c->status[i].idelta & 0xFF;
+ *dst++ = c->status[i].idelta >> 8;
+ }
+ for(i=0; i<avctx->channels; i++){
+ c->status[i].sample1= *samples++;
+
+ *dst++ = c->status[i].sample1 & 0xFF;
+ *dst++ = c->status[i].sample1 >> 8;
+ }
+ for(i=0; i<avctx->channels; i++){
+ c->status[i].sample2= *samples++;
+
+ *dst++ = c->status[i].sample2 & 0xFF;
+ *dst++ = c->status[i].sample2 >> 8;
+ }
+
+ for(i=7*avctx->channels; i<avctx->block_align; i++) {
+ int nibble;
+ nibble = adpcm_ms_compress_sample(&c->status[ 0], *samples++)<<4;
+ nibble|= adpcm_ms_compress_sample(&c->status[st], *samples++);
+ *dst++ = nibble;
+ }
+ break;
default:
return -1;
}
return dst - frame;
}
+#endif //CONFIG_ENCODERS
static int adpcm_decode_init(AVCodecContext * avctx)
{
c->status[0].step = c->status[1].step = 0;
switch(avctx->codec->id) {
+ case CODEC_ID_ADPCM_CT:
+ c->status[0].step = c->status[1].step = 511;
+ break;
default:
break;
}
return 0;
}
-static inline short adpcm_ima_expand_nibble(ADPCMChannelStatus *c, char nibble)
+static inline short adpcm_ima_expand_nibble(ADPCMChannelStatus *c, char nibble, int shift)
{
int step_index;
int predictor;
sign = nibble & 8;
delta = nibble & 7;
-#if 0
- diff = step >> 3;
- if (delta & 4) diff += step;
- if (delta & 2) diff += step >> 1;
- if (delta & 1) diff += step >> 2;
-#else
- diff = ((2 * delta + 1) * step) >> 3; // no jumps
-#endif
+ /* perform direct multiplication instead of series of jumps proposed by
+ * the reference ADPCM implementation since modern CPUs can do the mults
+ * quickly enough */
+ diff = ((2 * delta + 1) * step) >> shift;
predictor = c->predictor;
if (sign) predictor -= diff;
else predictor += diff;
return (short)predictor;
}
-static inline short adpcm_4xa_expand_nibble(ADPCMChannelStatus *c, char nibble)
+static inline short adpcm_ms_expand_nibble(ADPCMChannelStatus *c, char nibble)
{
- int step_index;
int predictor;
- int sign, delta, diff, step;
- step = step_table[c->step_index];
- step_index = c->step_index + index_table[(unsigned)nibble];
- if (step_index < 0) step_index = 0;
- else if (step_index > 88) step_index = 88;
+ predictor = (((c->sample1) * (c->coeff1)) + ((c->sample2) * (c->coeff2))) / 256;
+ predictor += (signed)((nibble & 0x08)?(nibble - 0x10):(nibble)) * c->idelta;
+ CLAMP_TO_SHORT(predictor);
+
+ c->sample2 = c->sample1;
+ c->sample1 = predictor;
+ c->idelta = (AdaptationTable[(int)nibble] * c->idelta) >> 8;
+ if (c->idelta < 16) c->idelta = 16;
+
+ return (short)predictor;
+}
+
+static inline short adpcm_ct_expand_nibble(ADPCMChannelStatus *c, char nibble)
+{
+ int predictor;
+ int sign, delta, diff;
+ int new_step;
sign = nibble & 8;
delta = nibble & 7;
-
- diff = (delta*step + (step>>1))>>3; // difference to code above
-
+ /* perform direct multiplication instead of series of jumps proposed by
+ * the reference ADPCM implementation since modern CPUs can do the mults
+ * quickly enough */
+ diff = ((2 * delta + 1) * c->step) >> 3;
predictor = c->predictor;
- if (sign) predictor -= diff;
- else predictor += diff;
+ /* predictor update is not so trivial: predictor is multiplied on 254/256 before updating */
+ if(sign)
+ predictor = ((predictor * 254) >> 8) - diff;
+ else
+ predictor = ((predictor * 254) >> 8) + diff;
+ /* calculate new step and clamp it to range 511..32767 */
+ new_step = (ct_adpcm_table[nibble & 7] * c->step) >> 8;
+ c->step = new_step;
+ if(c->step < 511)
+ c->step = 511;
+ if(c->step > 32767)
+ c->step = 32767;
CLAMP_TO_SHORT(predictor);
c->predictor = predictor;
- c->step_index = step_index;
-
return (short)predictor;
}
-static inline short adpcm_ms_expand_nibble(ADPCMChannelStatus *c, char nibble)
+static void xa_decode(short *out, const unsigned char *in,
+ ADPCMChannelStatus *left, ADPCMChannelStatus *right, int inc)
{
- int predictor;
+ int i, j;
+ int shift,filter,f0,f1;
+ int s_1,s_2;
+ int d,s,t;
+
+ for(i=0;i<4;i++) {
+
+ shift = 12 - (in[4+i*2] & 15);
+ filter = in[4+i*2] >> 4;
+ f0 = xa_adpcm_table[filter][0];
+ f1 = xa_adpcm_table[filter][1];
+
+ s_1 = left->sample1;
+ s_2 = left->sample2;
+
+ for(j=0;j<28;j++) {
+ d = in[16+i+j*4];
+
+ t = (signed char)(d<<4)>>4;
+ s = ( t<<shift ) + ((s_1*f0 + s_2*f1+32)>>6);
+ CLAMP_TO_SHORT(s);
+ *out = s;
+ out += inc;
+ s_2 = s_1;
+ s_1 = s;
+ }
- predictor = (((c->sample1) * (c->coeff1)) + ((c->sample2) * (c->coeff2))) / 256;
- predictor += (signed)((nibble & 0x08)?(nibble - 0x10):(nibble)) * c->idelta;
- CLAMP_TO_SHORT(predictor);
+ if (inc==2) { /* stereo */
+ left->sample1 = s_1;
+ left->sample2 = s_2;
+ s_1 = right->sample1;
+ s_2 = right->sample2;
+ out = out + 1 - 28*2;
+ }
- c->sample2 = c->sample1;
- c->sample1 = predictor;
- c->idelta = (AdaptationTable[(int)nibble] * c->idelta) / 256;
- if (c->idelta < 16) c->idelta = 16;
+ shift = 12 - (in[5+i*2] & 15);
+ filter = in[5+i*2] >> 4;
- return (short)predictor;
+ f0 = xa_adpcm_table[filter][0];
+ f1 = xa_adpcm_table[filter][1];
+
+ for(j=0;j<28;j++) {
+ d = in[16+i+j*4];
+
+ t = (signed char)d >> 4;
+ s = ( t<<shift ) + ((s_1*f0 + s_2*f1+32)>>6);
+ CLAMP_TO_SHORT(s);
+ *out = s;
+ out += inc;
+ s_2 = s_1;
+ s_1 = s;
+ }
+
+ if (inc==2) { /* stereo */
+ right->sample1 = s_1;
+ right->sample2 = s_2;
+ out -= 1;
+ } else {
+ left->sample1 = s_1;
+ left->sample2 = s_2;
+ }
+ }
}
+
+/* DK3 ADPCM support macro */
+#define DK3_GET_NEXT_NIBBLE() \
+ if (decode_top_nibble_next) \
+ { \
+ nibble = (last_byte >> 4) & 0x0F; \
+ decode_top_nibble_next = 0; \
+ } \
+ else \
+ { \
+ last_byte = *src++; \
+ if (src >= buf + buf_size) break; \
+ nibble = last_byte & 0x0F; \
+ decode_top_nibble_next = 1; \
+ }
+
static int adpcm_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
uint8_t *buf, int buf_size)
uint8_t *src;
int st; /* stereo */
+ /* DK3 ADPCM accounting variables */
+ unsigned char last_byte = 0;
+ unsigned char nibble;
+ int decode_top_nibble_next = 0;
+ int diff_channel;
+
+ /* EA ADPCM state variables */
+ uint32_t samples_in_chunk;
+ int32_t previous_left_sample, previous_right_sample;
+ int32_t current_left_sample, current_right_sample;
+ int32_t next_left_sample, next_right_sample;
+ int32_t coeff1l, coeff2l, coeff1r, coeff2r;
+ uint8_t shift_left, shift_right;
+ int count1, count2;
+
+ if (!buf_size)
+ return 0;
+
samples = data;
src = buf;
cs->step_index = (*src++) & 0x7F;
- if (cs->step_index > 88) fprintf(stderr, "ERROR: step_index = %i\n", cs->step_index);
+ if (cs->step_index > 88) av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i\n", cs->step_index);
if (cs->step_index > 88) cs->step_index = 88;
cs->step = step_table[cs->step_index];
if (st && channel)
samples++;
- *samples++ = cs->predictor;
- samples += st;
-
for(m=32; n>0 && m>0; n--, m--) { /* in QuickTime, IMA is encoded by chuncks of 34 bytes (=64 samples) */
- *samples = adpcm_ima_expand_nibble(cs, src[0] & 0x0F);
+ *samples = adpcm_ima_expand_nibble(cs, src[0] & 0x0F, 3);
samples += avctx->channels;
- *samples = adpcm_ima_expand_nibble(cs, (src[0] >> 4) & 0x0F);
+ *samples = adpcm_ima_expand_nibble(cs, (src[0] >> 4) & 0x0F, 3);
samples += avctx->channels;
src ++;
}
if(st) { /* handle stereo interlacing */
c->channel = (channel + 1) % 2; /* we get one packet for left, then one for right data */
- if(channel == 0) { /* wait for the other packet before outputing anything */
- *data_size = 0;
+ if(channel == 1) { /* wait for the other packet before outputing anything */
return src - buf;
}
}
break;
case CODEC_ID_ADPCM_IMA_WAV:
- if (buf_size > BLKSIZE) {
- if (avctx->block_align != 0)
- buf_size = avctx->block_align;
- else
- buf_size = BLKSIZE;
- }
- // XXX: do as per-channel loop
- cs = &(c->status[0]);
- cs->predictor = (*src++) & 0x0FF;
- cs->predictor |= ((*src++) << 8) & 0x0FF00;
- if(cs->predictor & 0x8000)
- cs->predictor -= 0x10000;
- CLAMP_TO_SHORT(cs->predictor);
-
- // XXX: is this correct ??: *samples++ = cs->predictor;
+ if (avctx->block_align != 0 && buf_size > avctx->block_align)
+ buf_size = avctx->block_align;
- cs->step_index = *src++;
- if (cs->step_index < 0) cs->step_index = 0;
- if (cs->step_index > 88) cs->step_index = 88;
- if (*src++) fprintf(stderr, "unused byte should be null !!\n"); /* unused */
-
- if (st) {
- cs = &(c->status[1]);
- cs->predictor = (*src++) & 0x0FF;
- cs->predictor |= ((*src++) << 8) & 0x0FF00;
+ for(i=0; i<avctx->channels; i++){
+ cs = &(c->status[i]);
+ cs->predictor = *src++;
+ cs->predictor |= (*src++) << 8;
if(cs->predictor & 0x8000)
cs->predictor -= 0x10000;
CLAMP_TO_SHORT(cs->predictor);
- // XXX: is this correct ??: *samples++ = cs->predictor;
+ // XXX: is this correct ??: *samples++ = cs->predictor;
- cs->step_index = *src++;
+ cs->step_index = *src++;
if (cs->step_index < 0) cs->step_index = 0;
if (cs->step_index > 88) cs->step_index = 88;
- src++; /* if != 0 -> out-of-sync */
+ if (*src++) av_log(avctx, AV_LOG_ERROR, "unused byte should be null !!\n"); /* unused */
}
for(m=4; src < (buf + buf_size);) {
- *samples++ = adpcm_ima_expand_nibble(&c->status[0], src[0] & 0x0F);
+ *samples++ = adpcm_ima_expand_nibble(&c->status[0], src[0] & 0x0F, 3);
if (st)
- *samples++ = adpcm_ima_expand_nibble(&c->status[1], src[4] & 0x0F);
- *samples++ = adpcm_ima_expand_nibble(&c->status[0], (src[0] >> 4) & 0x0F);
+ *samples++ = adpcm_ima_expand_nibble(&c->status[1], src[4] & 0x0F, 3);
+ *samples++ = adpcm_ima_expand_nibble(&c->status[0], (src[0] >> 4) & 0x0F, 3);
if (st) {
- *samples++ = adpcm_ima_expand_nibble(&c->status[1], (src[4] >> 4) & 0x0F);
+ *samples++ = adpcm_ima_expand_nibble(&c->status[1], (src[4] >> 4) & 0x0F, 3);
if (!--m) {
m=4;
src+=4;
if(st){
c->status[1].step_index= (int16_t)(src[0] + (src[1]<<8)); src+=2;
}
-// if (cs->step_index < 0) cs->step_index = 0;
-// if (cs->step_index > 88) cs->step_index = 88;
+ if (cs->step_index < 0) cs->step_index = 0;
+ if (cs->step_index > 88) cs->step_index = 88;
m= (buf_size - (src - buf))>>st;
-//printf("%d %d %d %d\n", st, m, c->status[0].predictor, c->status[0].step_index);
- //FIXME / XXX decode chanels individual & interleave samples
for(i=0; i<m; i++) {
- *samples++ = adpcm_4xa_expand_nibble(&c->status[0], src[i] & 0x0F);
+ *samples++ = adpcm_ima_expand_nibble(&c->status[0], src[i] & 0x0F, 4);
if (st)
- *samples++ = adpcm_4xa_expand_nibble(&c->status[1], src[i+m] & 0x0F);
- *samples++ = adpcm_4xa_expand_nibble(&c->status[0], src[i] >> 4);
+ *samples++ = adpcm_ima_expand_nibble(&c->status[1], src[i+m] & 0x0F, 4);
+ *samples++ = adpcm_ima_expand_nibble(&c->status[0], src[i] >> 4, 4);
if (st)
- *samples++ = adpcm_4xa_expand_nibble(&c->status[1], src[i+m] >> 4);
+ *samples++ = adpcm_ima_expand_nibble(&c->status[1], src[i+m] >> 4, 4);
}
src += m<<st;
break;
case CODEC_ID_ADPCM_MS:
-
- if (buf_size > BLKSIZE) {
- if (avctx->block_align != 0)
- buf_size = avctx->block_align;
- else
- buf_size = BLKSIZE;
- }
+ if (avctx->block_align != 0 && buf_size > avctx->block_align)
+ buf_size = avctx->block_align;
n = buf_size - 7 * avctx->channels;
if (n < 0)
return -1;
- block_predictor[0] = (*src++); /* should be bound */
- block_predictor[0] = (block_predictor[0] < 0)?(0):((block_predictor[0] > 7)?(7):(block_predictor[0]));
+ block_predictor[0] = clip(*src++, 0, 7);
block_predictor[1] = 0;
if (st)
- block_predictor[1] = (*src++);
- block_predictor[1] = (block_predictor[1] < 0)?(0):((block_predictor[1] > 7)?(7):(block_predictor[1]));
- c->status[0].idelta = ((*src & 0xFF) | ((src[1] << 8) & 0xFF00));
- if (c->status[0].idelta & 0x08000)
- c->status[0].idelta -= 0x10000;
+ block_predictor[1] = clip(*src++, 0, 7);
+ c->status[0].idelta = (int16_t)((*src & 0xFF) | ((src[1] << 8) & 0xFF00));
src+=2;
- if (st)
- c->status[1].idelta = ((*src & 0xFF) | ((src[1] << 8) & 0xFF00));
- if (st && c->status[1].idelta & 0x08000)
- c->status[1].idelta |= 0xFFFF0000;
- if (st)
+ if (st){
+ c->status[1].idelta = (int16_t)((*src & 0xFF) | ((src[1] << 8) & 0xFF00));
src+=2;
+ }
c->status[0].coeff1 = AdaptCoeff1[block_predictor[0]];
c->status[0].coeff2 = AdaptCoeff2[block_predictor[0]];
c->status[1].coeff1 = AdaptCoeff1[block_predictor[1]];
src ++;
}
break;
+ case CODEC_ID_ADPCM_IMA_DK4:
+ if (avctx->block_align != 0 && buf_size > avctx->block_align)
+ buf_size = avctx->block_align;
+
+ c->status[0].predictor = (int16_t)(src[0] | (src[1] << 8));
+ c->status[0].step_index = src[2];
+ src += 4;
+ *samples++ = c->status[0].predictor;
+ if (st) {
+ c->status[1].predictor = (int16_t)(src[0] | (src[1] << 8));
+ c->status[1].step_index = src[2];
+ src += 4;
+ *samples++ = c->status[1].predictor;
+ }
+ while (src < buf + buf_size) {
+
+ /* take care of the top nibble (always left or mono channel) */
+ *samples++ = adpcm_ima_expand_nibble(&c->status[0],
+ (src[0] >> 4) & 0x0F, 3);
+
+ /* take care of the bottom nibble, which is right sample for
+ * stereo, or another mono sample */
+ if (st)
+ *samples++ = adpcm_ima_expand_nibble(&c->status[1],
+ src[0] & 0x0F, 3);
+ else
+ *samples++ = adpcm_ima_expand_nibble(&c->status[0],
+ src[0] & 0x0F, 3);
+
+ src++;
+ }
+ break;
+ case CODEC_ID_ADPCM_IMA_DK3:
+ if (avctx->block_align != 0 && buf_size > avctx->block_align)
+ buf_size = avctx->block_align;
+
+ c->status[0].predictor = (int16_t)(src[10] | (src[11] << 8));
+ c->status[1].predictor = (int16_t)(src[12] | (src[13] << 8));
+ c->status[0].step_index = src[14];
+ c->status[1].step_index = src[15];
+ /* sign extend the predictors */
+ src += 16;
+ diff_channel = c->status[1].predictor;
+
+ /* the DK3_GET_NEXT_NIBBLE macro issues the break statement when
+ * the buffer is consumed */
+ while (1) {
+
+ /* for this algorithm, c->status[0] is the sum channel and
+ * c->status[1] is the diff channel */
+
+ /* process the first predictor of the sum channel */
+ DK3_GET_NEXT_NIBBLE();
+ adpcm_ima_expand_nibble(&c->status[0], nibble, 3);
+
+ /* process the diff channel predictor */
+ DK3_GET_NEXT_NIBBLE();
+ adpcm_ima_expand_nibble(&c->status[1], nibble, 3);
+
+ /* process the first pair of stereo PCM samples */
+ diff_channel = (diff_channel + c->status[1].predictor) / 2;
+ *samples++ = c->status[0].predictor + c->status[1].predictor;
+ *samples++ = c->status[0].predictor - c->status[1].predictor;
+
+ /* process the second predictor of the sum channel */
+ DK3_GET_NEXT_NIBBLE();
+ adpcm_ima_expand_nibble(&c->status[0], nibble, 3);
+
+ /* process the second pair of stereo PCM samples */
+ diff_channel = (diff_channel + c->status[1].predictor) / 2;
+ *samples++ = c->status[0].predictor + c->status[1].predictor;
+ *samples++ = c->status[0].predictor - c->status[1].predictor;
+ }
+ break;
+ case CODEC_ID_ADPCM_IMA_WS:
+ /* no per-block initialization; just start decoding the data */
+ while (src < buf + buf_size) {
+
+ if (st) {
+ *samples++ = adpcm_ima_expand_nibble(&c->status[0],
+ (src[0] >> 4) & 0x0F, 3);
+ *samples++ = adpcm_ima_expand_nibble(&c->status[1],
+ src[0] & 0x0F, 3);
+ } else {
+ *samples++ = adpcm_ima_expand_nibble(&c->status[0],
+ (src[0] >> 4) & 0x0F, 3);
+ *samples++ = adpcm_ima_expand_nibble(&c->status[0],
+ src[0] & 0x0F, 3);
+ }
+
+ src++;
+ }
+ break;
+ case CODEC_ID_ADPCM_XA:
+ c->status[0].sample1 = c->status[0].sample2 =
+ c->status[1].sample1 = c->status[1].sample2 = 0;
+ while (buf_size >= 128) {
+ xa_decode(samples, src, &c->status[0], &c->status[1],
+ avctx->channels);
+ src += 128;
+ samples += 28 * 8;
+ buf_size -= 128;
+ }
+ break;
+ case CODEC_ID_ADPCM_EA:
+ samples_in_chunk = LE_32(src);
+ if (samples_in_chunk >= ((buf_size - 12) * 2)) {
+ src += buf_size;
+ break;
+ }
+ src += 4;
+ current_left_sample = (int16_t)LE_16(src);
+ src += 2;
+ previous_left_sample = (int16_t)LE_16(src);
+ src += 2;
+ current_right_sample = (int16_t)LE_16(src);
+ src += 2;
+ previous_right_sample = (int16_t)LE_16(src);
+ src += 2;
+
+ for (count1 = 0; count1 < samples_in_chunk/28;count1++) {
+ coeff1l = ea_adpcm_table[(*src >> 4) & 0x0F];
+ coeff2l = ea_adpcm_table[((*src >> 4) & 0x0F) + 4];
+ coeff1r = ea_adpcm_table[*src & 0x0F];
+ coeff2r = ea_adpcm_table[(*src & 0x0F) + 4];
+ src++;
+
+ shift_left = ((*src >> 4) & 0x0F) + 8;
+ shift_right = (*src & 0x0F) + 8;
+ src++;
+
+ for (count2 = 0; count2 < 28; count2++) {
+ next_left_sample = (((*src & 0xF0) << 24) >> shift_left);
+ next_right_sample = (((*src & 0x0F) << 28) >> shift_right);
+ src++;
+
+ next_left_sample = (next_left_sample +
+ (current_left_sample * coeff1l) +
+ (previous_left_sample * coeff2l) + 0x80) >> 8;
+ next_right_sample = (next_right_sample +
+ (current_right_sample * coeff1r) +
+ (previous_right_sample * coeff2r) + 0x80) >> 8;
+ CLAMP_TO_SHORT(next_left_sample);
+ CLAMP_TO_SHORT(next_right_sample);
+
+ previous_left_sample = current_left_sample;
+ current_left_sample = next_left_sample;
+ previous_right_sample = current_right_sample;
+ current_right_sample = next_right_sample;
+ *samples++ = (unsigned short)current_left_sample;
+ *samples++ = (unsigned short)current_right_sample;
+ }
+ }
+ break;
+ case CODEC_ID_ADPCM_IMA_SMJPEG:
+ c->status[0].predictor = *src;
+ src += 2;
+ c->status[0].step_index = *src++;
+ src++; /* skip another byte before getting to the meat */
+ while (src < buf + buf_size) {
+ *samples++ = adpcm_ima_expand_nibble(&c->status[0],
+ *src & 0x0F, 3);
+ *samples++ = adpcm_ima_expand_nibble(&c->status[0],
+ (*src >> 4) & 0x0F, 3);
+ src++;
+ }
+ break;
+ case CODEC_ID_ADPCM_CT:
+ while (src < buf + buf_size) {
+ if (st) {
+ *samples++ = adpcm_ct_expand_nibble(&c->status[0],
+ (src[0] >> 4) & 0x0F);
+ *samples++ = adpcm_ct_expand_nibble(&c->status[1],
+ src[0] & 0x0F);
+ } else {
+ *samples++ = adpcm_ct_expand_nibble(&c->status[0],
+ (src[0] >> 4) & 0x0F);
+ *samples++ = adpcm_ct_expand_nibble(&c->status[0],
+ src[0] & 0x0F);
+ }
+ src++;
+ }
+ break;
+ case CODEC_ID_ADPCM_SWF:
+ {
+ GetBitContext gb;
+ int *table;
+ int k0, signmask;
+ int size = buf_size*8;
+
+ init_get_bits(&gb, buf, size);
+
+ // first frame, read bits & inital values
+ if (!c->nb_bits)
+ {
+ c->nb_bits = get_bits(&gb, 2)+2;
+// av_log(NULL,AV_LOG_INFO,"nb_bits: %d\n", c->nb_bits);
+ }
+
+ table = swf_index_tables[c->nb_bits-2];
+ k0 = 1 << (c->nb_bits-2);
+ signmask = 1 << (c->nb_bits-1);
+
+ while (get_bits_count(&gb) <= size)
+ {
+ int i;
+
+ c->nb_samples++;
+ // wrap around at every 4096 samples...
+ if ((c->nb_samples & 0xfff) == 1)
+ {
+ for (i = 0; i <= st; i++)
+ {
+ *samples++ = c->status[i].predictor = get_sbits(&gb, 16);
+ c->status[i].step_index = get_bits(&gb, 6);
+ }
+ }
+
+ // similar to IMA adpcm
+ for (i = 0; i <= st; i++)
+ {
+ int delta = get_bits(&gb, c->nb_bits);
+ int step = step_table[c->status[i].step_index];
+ long vpdiff = 0; // vpdiff = (delta+0.5)*step/4
+ int k = k0;
+
+ do {
+ if (delta & k)
+ vpdiff += step;
+ step >>= 1;
+ k >>= 1;
+ } while(k);
+ vpdiff += step;
+
+ if (delta & signmask)
+ c->status[i].predictor -= vpdiff;
+ else
+ c->status[i].predictor += vpdiff;
+
+ c->status[i].step_index += table[delta & (~signmask)];
+
+ c->status[i].step_index = clip(c->status[i].step_index, 0, 88);
+ c->status[i].predictor = clip(c->status[i].predictor, -32768, 32767);
+
+ *samples++ = c->status[i].predictor;
+ }
+ }
+
+// src += get_bits_count(&gb)*8;
+ src += size;
+
+ break;
+ }
default:
- *data_size = 0;
return -1;
}
*data_size = (uint8_t *)samples - (uint8_t *)data;
return src - buf;
}
-#define ADPCM_CODEC(id, name) \
+
+
+#ifdef CONFIG_ENCODERS
+#define ADPCM_ENCODER(id,name) \
AVCodec name ## _encoder = { \
#name, \
CODEC_TYPE_AUDIO, \
adpcm_encode_frame, \
adpcm_encode_close, \
NULL, \
-}; \
+};
+#else
+#define ADPCM_ENCODER(id,name)
+#endif
+
+#ifdef CONFIG_DECODERS
+#define ADPCM_DECODER(id,name) \
AVCodec name ## _decoder = { \
#name, \
CODEC_TYPE_AUDIO, \
NULL, \
adpcm_decode_frame, \
};
+#else
+#define ADPCM_DECODER(id,name)
+#endif
+
+#define ADPCM_CODEC(id, name) \
+ADPCM_ENCODER(id,name) ADPCM_DECODER(id,name)
ADPCM_CODEC(CODEC_ID_ADPCM_IMA_QT, adpcm_ima_qt);
ADPCM_CODEC(CODEC_ID_ADPCM_IMA_WAV, adpcm_ima_wav);
+ADPCM_CODEC(CODEC_ID_ADPCM_IMA_DK3, adpcm_ima_dk3);
+ADPCM_CODEC(CODEC_ID_ADPCM_IMA_DK4, adpcm_ima_dk4);
+ADPCM_CODEC(CODEC_ID_ADPCM_IMA_WS, adpcm_ima_ws);
+ADPCM_CODEC(CODEC_ID_ADPCM_IMA_SMJPEG, adpcm_ima_smjpeg);
ADPCM_CODEC(CODEC_ID_ADPCM_MS, adpcm_ms);
ADPCM_CODEC(CODEC_ID_ADPCM_4XM, adpcm_4xm);
+ADPCM_CODEC(CODEC_ID_ADPCM_XA, adpcm_xa);
+ADPCM_CODEC(CODEC_ID_ADPCM_ADX, adpcm_adx);
+ADPCM_CODEC(CODEC_ID_ADPCM_EA, adpcm_ea);
+ADPCM_CODEC(CODEC_ID_ADPCM_CT, adpcm_ct);
+ADPCM_CODEC(CODEC_ID_ADPCM_SWF, adpcm_swf);
#undef ADPCM_CODEC
-
projects / ffmpeg / blobdiff