diff options
| author | povaddict <povaddict@users.sourceforge.net> | 2010-02-10 02:16:44 +0300 |
|---|---|---|
| committer | povaddict <povaddict@users.sourceforge.net> | 2010-02-10 02:16:44 +0300 |
| commit | 726a91b12a7524e45e7a901c9e4883af5b1bffe6 (patch) | |
| tree | f5d25e3b2e84c92f4901280c73d5d3d7e6c3cd19 /src/filters/transform/MPCVideoDec/ffmpeg/libavcodec/adpcm.c | |
| parent | 02183f6e47ad4ea1057de9950482f291f2ae4290 (diff) | |
Rename several directories to use MixedCase instead of lowercase.
They now mostly match the case used in #includes,
and they're consistent with the names of the .h files they contain.
git-svn-id: https://mpc-hc.svn.sourceforge.net/svnroot/mpc-hc/trunk@1648 10f7b99b-c216-0410-bff0-8a66a9350fd8
Diffstat (limited to 'src/filters/transform/MPCVideoDec/ffmpeg/libavcodec/adpcm.c')
| -rw-r--r-- | src/filters/transform/MPCVideoDec/ffmpeg/libavcodec/adpcm.c | 881 |
1 files changed, 881 insertions, 0 deletions
diff --git a/src/filters/transform/MPCVideoDec/ffmpeg/libavcodec/adpcm.c b/src/filters/transform/MPCVideoDec/ffmpeg/libavcodec/adpcm.c new file mode 100644 index 000000000..365da9cbb --- /dev/null +++ b/src/filters/transform/MPCVideoDec/ffmpeg/libavcodec/adpcm.c @@ -0,0 +1,881 @@ +/*
+ * ADPCM codecs
+ * Copyright (c) 2001-2003 The ffmpeg Project
+ *
+ * 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 "avcodec.h"
+#include "get_bits.h"
+#include "put_bits.h"
+#include "bytestream.h"
+
+/**
+ * @file libavcodec/adpcm.c
+ * ADPCM codecs.
+ * 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/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
+
+/* step_table[] and index_table[] are from the ADPCM reference source */
+/* This is the index table: */
+static const int index_table[16] = {
+ -1, -1, -1, -1, 2, 4, 6, 8,
+ -1, -1, -1, -1, 2, 4, 6, 8,
+};
+
+/**
+ * This is the step table. Note that many programs use slight deviations from
+ * this table, but such deviations are negligible:
+ */
+static const int step_table[89] = {
+ 7, 8, 9, 10, 11, 12, 13, 14, 16, 17,
+ 19, 21, 23, 25, 28, 31, 34, 37, 41, 45,
+ 50, 55, 60, 66, 73, 80, 88, 97, 107, 118,
+ 130, 143, 157, 173, 190, 209, 230, 253, 279, 307,
+ 337, 371, 408, 449, 494, 544, 598, 658, 724, 796,
+ 876, 963, 1060, 1166, 1282, 1411, 1552, 1707, 1878, 2066,
+ 2272, 2499, 2749, 3024, 3327, 3660, 4026, 4428, 4871, 5358,
+ 5894, 6484, 7132, 7845, 8630, 9493, 10442, 11487, 12635, 13899,
+ 15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794, 32767
+};
+
+/* These are for MS-ADPCM */
+/* AdaptationTable[], AdaptCoeff1[], and AdaptCoeff2[] are from libsndfile */
+static const int AdaptationTable[] = {
+ 230, 230, 230, 230, 307, 409, 512, 614,
+ 768, 614, 512, 409, 307, 230, 230, 230
+};
+
+/** Divided by 4 to fit in 8-bit integers */
+static const uint8_t AdaptCoeff1[] = {
+ 64, 128, 0, 48, 60, 115, 98
+};
+
+/** Divided by 4 to fit in 8-bit integers */
+static const int8_t AdaptCoeff2[] = {
+ 0, -64, 0, 16, 0, -52, -58
+};
+
+/* 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 const int ea_adpcm_table[] = {
+ 0, 240, 460, 392, 0, 0, -208, -220, 0, 1,
+ 3, 4, 7, 8, 10, 11, 0, -1, -3, -4
+};
+
+// padded to zero where table size is less then 16
+static const 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 }
+};
+
+static const int yamaha_indexscale[] = {
+ 230, 230, 230, 230, 307, 409, 512, 614,
+ 230, 230, 230, 230, 307, 409, 512, 614
+};
+
+static const int yamaha_difflookup[] = {
+ 1, 3, 5, 7, 9, 11, 13, 15,
+ -1, -3, -5, -7, -9, -11, -13, -15
+};
+
+/* end of tables */
+
+typedef struct ADPCMChannelStatus {
+ int predictor;
+ short int step_index;
+ int step;
+ /* for encoding */
+ int prev_sample;
+
+ /* MS version */
+ short sample1;
+ short sample2;
+ int coeff1;
+ int coeff2;
+ int idelta;
+} ADPCMChannelStatus;
+
+typedef struct ADPCMContext {
+ ADPCMChannelStatus status[2];
+} ADPCMContext;
+
+static av_cold int adpcm_decode_init(AVCodecContext * avctx)
+{
+ ADPCMContext *c = avctx->priv_data;
+ unsigned int max_channels = 2;
+
+ if(avctx->channels > max_channels){
+ return -1;
+ }
+
+ switch(avctx->codec->id) {
+ case CODEC_ID_ADPCM_CT:
+ c->status[0].step = c->status[1].step = 511;
+ break;
+ case CODEC_ID_ADPCM_IMA_WS:
+ if (avctx->extradata && avctx->extradata_size == 2 * 4) {
+ c->status[0].predictor = AV_RL32(avctx->extradata);
+ c->status[1].predictor = AV_RL32(avctx->extradata + 4);
+ }
+ break;
+ default:
+ break;
+ }
+ avctx->sample_fmt = SAMPLE_FMT_S16;
+ return 0;
+}
+
+static inline short adpcm_ima_expand_nibble(ADPCMChannelStatus *c, char nibble, int shift)
+{
+ 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;
+
+ sign = nibble & 8;
+ delta = nibble & 7;
+ /* 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;
+
+ c->predictor = av_clip_int16(predictor);
+ c->step_index = step_index;
+
+ return (short)c->predictor;
+}
+
+static inline short adpcm_ms_expand_nibble(ADPCMChannelStatus *c, char nibble)
+{
+ int predictor;
+
+ predictor = (((c->sample1) * (c->coeff1)) + ((c->sample2) * (c->coeff2))) / 64;
+ predictor += (signed)((nibble & 0x08)?(nibble - 0x10):(nibble)) * c->idelta;
+
+ c->sample2 = c->sample1;
+ c->sample1 = av_clip_int16(predictor);
+ c->idelta = (AdaptationTable[(int)nibble] * c->idelta) >> 8;
+ if (c->idelta < 16) c->idelta = 16;
+
+ return c->sample1;
+}
+
+static inline short adpcm_ct_expand_nibble(ADPCMChannelStatus *c, char nibble)
+{
+ int sign, delta, diff;
+ int new_step;
+
+ sign = nibble & 8;
+ delta = nibble & 7;
+ /* 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 update is not so trivial: predictor is multiplied on 254/256 before updating */
+ c->predictor = ((c->predictor * 254) >> 8) + (sign ? -diff : diff);
+ c->predictor = av_clip_int16(c->predictor);
+ /* calculate new step and clamp it to range 511..32767 */
+ new_step = (AdaptationTable[nibble & 7] * c->step) >> 8;
+ c->step = av_clip(new_step, 511, 32767);
+
+ return (short)c->predictor;
+}
+
+static inline short adpcm_sbpro_expand_nibble(ADPCMChannelStatus *c, char nibble, int size, int shift)
+{
+ int sign, delta, diff;
+
+ sign = nibble & (1<<(size-1));
+ delta = nibble & ((1<<(size-1))-1);
+ diff = delta << (7 + c->step + shift);
+
+ /* clamp result */
+ c->predictor = av_clip(c->predictor + (sign ? -diff : diff), -16384,16256);
+
+ /* calculate new step */
+ if (delta >= (2*size - 3) && c->step < 3)
+ c->step++;
+ else if (delta == 0 && c->step > 0)
+ c->step--;
+
+ return (short) c->predictor;
+}
+
+static inline short adpcm_yamaha_expand_nibble(ADPCMChannelStatus *c, unsigned char nibble)
+{
+ if(!c->step) {
+ c->predictor = 0;
+ c->step = 127;
+ }
+
+ c->predictor += (c->step * yamaha_difflookup[nibble]) / 8;
+ c->predictor = av_clip_int16(c->predictor);
+ c->step = (c->step * yamaha_indexscale[nibble]) >> 8;
+ c->step = av_clip(c->step, 127, 24567);
+ return c->predictor;
+}
+
+static void xa_decode(short *out, const unsigned char *in,
+ ADPCMChannelStatus *left, ADPCMChannelStatus *right, int inc)
+{
+ 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);
+ s_2 = s_1;
+ s_1 = av_clip_int16(s);
+ *out = s_1;
+ out += inc;
+ }
+
+ 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;
+ }
+
+ shift = 12 - (in[5+i*2] & 15);
+ filter = in[5+i*2] >> 4;
+
+ 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);
+ s_2 = s_1;
+ s_1 = av_clip_int16(s);
+ *out = s_1;
+ out += inc;
+ }
+
+ 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; \
+ 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,
+ const uint8_t *buf, int buf_size)
+{
+ ADPCMContext *c = avctx->priv_data;
+ ADPCMChannelStatus *cs;
+ int n, m, channel, i;
+ int block_predictor[2];
+ short *samples;
+ short *samples_end;
+ const 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;
+
+ //should protect all 4bit ADPCM variants
+ //8 is needed for CODEC_ID_ADPCM_IMA_WAV with 2 channels
+ //
+ if(*data_size/4 < buf_size + 8)
+ return -1;
+
+ samples = data;
+ samples_end= samples + *data_size/2;
+ *data_size= 0;
+ src = buf;
+
+ st = avctx->channels == 2 ? 1 : 0;
+
+ switch(avctx->codec->id) {
+ case CODEC_ID_ADPCM_IMA_QT:
+ n = buf_size - 2*avctx->channels;
+ for (channel = 0; channel < avctx->channels; channel++) {
+ cs = &(c->status[channel]);
+ /* (pppppp) (piiiiiii) */
+
+ /* Bits 15-7 are the _top_ 9 bits of the 16-bit initial predictor value */
+ cs->predictor = (*src++) << 8;
+ cs->predictor |= (*src & 0x80);
+ cs->predictor &= 0xFF80;
+
+ /* sign extension */
+ if(cs->predictor & 0x8000)
+ cs->predictor -= 0x10000;
+
+ cs->predictor = av_clip_int16(cs->predictor);
+
+ cs->step_index = (*src++) & 0x7F;
+
+ if (cs->step_index > 88){
+ av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i\n", cs->step_index);
+ cs->step_index = 88;
+ }
+
+ cs->step = step_table[cs->step_index];
+
+ samples = (short*)data + channel;
+
+ 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, 3);
+ samples += avctx->channels;
+ *samples = adpcm_ima_expand_nibble(cs, src[0] >> 4 , 3);
+ samples += avctx->channels;
+ src ++;
+ }
+ }
+ if (st)
+ samples--;
+ break;
+ case CODEC_ID_ADPCM_IMA_WAV:
+ if (avctx->block_align != 0 && buf_size > avctx->block_align)
+ buf_size = avctx->block_align;
+
+// samples_per_block= (block_align-4*chanels)*8 / (bits_per_sample * chanels) + 1;
+
+ for(i=0; i<avctx->channels; i++){
+ cs = &(c->status[i]);
+ cs->predictor = *samples++ = (int16_t)bytestream_get_le16(&src);
+
+ cs->step_index = *src++;
+ if (cs->step_index > 88){
+ av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i\n", cs->step_index);
+ cs->step_index = 88;
+ }
+ if (*src++) av_log(avctx, AV_LOG_ERROR, "unused byte should be null but is %d!!\n", src[-1]); /* unused */
+ }
+
+ while(src < buf + buf_size){
+ for(m=0; m<4; m++){
+ for(i=0; i<=st; i++)
+ *samples++ = adpcm_ima_expand_nibble(&c->status[i], src[4*i] & 0x0F, 3);
+ for(i=0; i<=st; i++)
+ *samples++ = adpcm_ima_expand_nibble(&c->status[i], src[4*i] >> 4 , 3);
+ src++;
+ }
+ src += 4*st;
+ }
+ break;
+ case CODEC_ID_ADPCM_4XM:
+ cs = &(c->status[0]);
+ c->status[0].predictor= (int16_t)bytestream_get_le16(&src);
+ if(st){
+ c->status[1].predictor= (int16_t)bytestream_get_le16(&src);
+ }
+ c->status[0].step_index= (int16_t)bytestream_get_le16(&src);
+ if(st){
+ c->status[1].step_index= (int16_t)bytestream_get_le16(&src);
+ }
+ if (cs->step_index < 0) cs->step_index = 0;
+ if (cs->step_index > 88) cs->step_index = 88;
+
+ m= (buf_size - (src - buf))>>st;
+ for(i=0; i<m; i++) {
+ *samples++ = adpcm_ima_expand_nibble(&c->status[0], src[i] & 0x0F, 4);
+ if (st)
+ *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_ima_expand_nibble(&c->status[1], src[i+m] >> 4, 4);
+ }
+
+ src += m<<st;
+
+ break;
+ case CODEC_ID_ADPCM_MS:
+ 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] = av_clip(*src++, 0, 6);
+ block_predictor[1] = 0;
+ if (st)
+ block_predictor[1] = av_clip(*src++, 0, 6);
+ c->status[0].idelta = (int16_t)bytestream_get_le16(&src);
+ if (st){
+ c->status[1].idelta = (int16_t)bytestream_get_le16(&src);
+ }
+ c->status[0].coeff1 = AdaptCoeff1[block_predictor[0]];
+ c->status[0].coeff2 = AdaptCoeff2[block_predictor[0]];
+ c->status[1].coeff1 = AdaptCoeff1[block_predictor[1]];
+ c->status[1].coeff2 = AdaptCoeff2[block_predictor[1]];
+
+ c->status[0].sample1 = bytestream_get_le16(&src);
+ if (st) c->status[1].sample1 = bytestream_get_le16(&src);
+ c->status[0].sample2 = bytestream_get_le16(&src);
+ if (st) c->status[1].sample2 = bytestream_get_le16(&src);
+
+ *samples++ = c->status[0].sample2;
+ if (st) *samples++ = c->status[1].sample2;
+ *samples++ = c->status[0].sample1;
+ if (st) *samples++ = c->status[1].sample1;
+ for(;n>0;n--) {
+ *samples++ = adpcm_ms_expand_nibble(&c->status[0 ], src[0] >> 4 );
+ *samples++ = adpcm_ms_expand_nibble(&c->status[st], src[0] & 0x0F);
+ 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)bytestream_get_le16(&src);
+ c->status[0].step_index = *src++;
+ src++;
+ *samples++ = c->status[0].predictor;
+ if (st) {
+ c->status[1].predictor = (int16_t)bytestream_get_le16(&src);
+ c->status[1].step_index = *src++;
+ src++;
+ *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, 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;
+
+ if(buf_size + 16 > (samples_end - samples)*3/8)
+ return -1;
+
+ c->status[0].predictor = (int16_t)AV_RL16(src + 10);
+ c->status[1].predictor = (int16_t)AV_RL16(src + 12);
+ 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 , 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 , 3);
+ *samples++ = adpcm_ima_expand_nibble(&c->status[0],
+ src[0] & 0x0F, 3);
+ }
+
+ src++;
+ }
+ break;
+ case CODEC_ID_ADPCM_XA:
+ 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:
+ if (buf_size < 4 || AV_RL32(src) >= ((buf_size - 12) * 2)) {
+ src += buf_size;
+ break;
+ }
+ samples_in_chunk = AV_RL32(src);
+ src += 4;
+ current_left_sample = (int16_t)bytestream_get_le16(&src);
+ previous_left_sample = (int16_t)bytestream_get_le16(&src);
+ current_right_sample = (int16_t)bytestream_get_le16(&src);
+ previous_right_sample = (int16_t)bytestream_get_le16(&src);
+
+ for (count1 = 0; count1 < samples_in_chunk/28;count1++) {
+ coeff1l = ea_adpcm_table[ *src >> 4 ];
+ coeff2l = ea_adpcm_table[(*src >> 4 ) + 4];
+ coeff1r = ea_adpcm_table[*src & 0x0F];
+ coeff2r = ea_adpcm_table[(*src & 0x0F) + 4];
+ src++;
+
+ shift_left = (*src >> 4 ) + 8;
+ shift_right = (*src & 0x0F) + 8;
+ src++;
+
+ for (count2 = 0; count2 < 28; count2++) {
+ next_left_sample = (int32_t)((*src & 0xF0) << 24) >> shift_left;
+ next_right_sample = (int32_t)((*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;
+
+ previous_left_sample = current_left_sample;
+ current_left_sample = av_clip_int16(next_left_sample);
+ previous_right_sample = current_right_sample;
+ current_right_sample = av_clip_int16(next_right_sample);
+ *samples++ = (unsigned short)current_left_sample;
+ *samples++ = (unsigned short)current_right_sample;
+ }
+ }
+
+ if (src - buf == buf_size - 2)
+ src += 2; // Skip terminating 0x0000
+
+ break;
+ case CODEC_ID_ADPCM_IMA_AMV:
+ case CODEC_ID_ADPCM_IMA_SMJPEG:
+ c->status[0].predictor = (int16_t)bytestream_get_le16(&src);
+ c->status[0].step_index = bytestream_get_le16(&src);
+
+ if (avctx->codec->id == CODEC_ID_ADPCM_IMA_AMV)
+ src+=4;
+
+ while (src < buf + buf_size) {
+ char hi, lo;
+ lo = *src & 0x0F;
+ hi = *src >> 4;
+
+ if (avctx->codec->id == CODEC_ID_ADPCM_IMA_AMV)
+ FFSWAP(char, hi, lo);
+
+ *samples++ = adpcm_ima_expand_nibble(&c->status[0],
+ lo, 3);
+ *samples++ = adpcm_ima_expand_nibble(&c->status[0],
+ hi, 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);
+ *samples++ = adpcm_ct_expand_nibble(&c->status[1],
+ src[0] & 0x0F);
+ } else {
+ *samples++ = adpcm_ct_expand_nibble(&c->status[0],
+ src[0] >> 4);
+ *samples++ = adpcm_ct_expand_nibble(&c->status[0],
+ src[0] & 0x0F);
+ }
+ src++;
+ }
+ break;
+ case CODEC_ID_ADPCM_SBPRO_4:
+ case CODEC_ID_ADPCM_SBPRO_3:
+ case CODEC_ID_ADPCM_SBPRO_2:
+ if (!c->status[0].step_index) {
+ /* the first byte is a raw sample */
+ *samples++ = 128 * (*src++ - 0x80);
+ if (st)
+ *samples++ = 128 * (*src++ - 0x80);
+ c->status[0].step_index = 1;
+ }
+ if (avctx->codec->id == CODEC_ID_ADPCM_SBPRO_4) {
+ while (src < buf + buf_size) {
+ *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
+ src[0] >> 4, 4, 0);
+ *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],
+ src[0] & 0x0F, 4, 0);
+ src++;
+ }
+ } else if (avctx->codec->id == CODEC_ID_ADPCM_SBPRO_3) {
+ while (src < buf + buf_size && samples + 2 < samples_end) {
+ *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
+ src[0] >> 5 , 3, 0);
+ *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
+ (src[0] >> 2) & 0x07, 3, 0);
+ *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
+ src[0] & 0x03, 2, 0);
+ src++;
+ }
+ } else {
+ while (src < buf + buf_size && samples + 3 < samples_end) {
+ *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
+ src[0] >> 6 , 2, 2);
+ *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],
+ (src[0] >> 4) & 0x03, 2, 2);
+ *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
+ (src[0] >> 2) & 0x03, 2, 2);
+ *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],
+ src[0] & 0x03, 2, 2);
+ src++;
+ }
+ }
+ break;
+ case CODEC_ID_ADPCM_SWF:
+ {
+ GetBitContext gb;
+ const int *table;
+ int k0, signmask, nb_bits, count;
+ int size = buf_size*8;
+
+ init_get_bits(&gb, buf, size);
+
+ //read bits & initial values
+ nb_bits = get_bits(&gb, 2)+2;
+ //av_log(NULL,AV_LOG_INFO,"nb_bits: %d\n", nb_bits);
+ table = swf_index_tables[nb_bits-2];
+ k0 = 1 << (nb_bits-2);
+ signmask = 1 << (nb_bits-1);
+
+ while (get_bits_count(&gb) <= size - 22*avctx->channels) {
+ for (i = 0; i < avctx->channels; i++) {
+ *samples++ = c->status[i].predictor = get_sbits(&gb, 16);
+ c->status[i].step_index = get_bits(&gb, 6);
+ }
+
+ for (count = 0; get_bits_count(&gb) <= size - nb_bits*avctx->channels && count < 4095; count++) {
+ int i;
+
+ for (i = 0; i < avctx->channels; i++) {
+ // similar to IMA adpcm
+ int delta = get_bits(&gb, 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 = av_clip(c->status[i].step_index, 0, 88);
+ c->status[i].predictor = av_clip_int16(c->status[i].predictor);
+
+ *samples++ = c->status[i].predictor;
+ if (samples >= samples_end) {
+ av_log(avctx, AV_LOG_ERROR, "allocated output buffer is too small\n");
+ return -1;
+ }
+ }
+ }
+ }
+ src += buf_size;
+ break;
+ }
+ case CODEC_ID_ADPCM_YAMAHA:
+ while (src < buf + buf_size) {
+ if (st) {
+ *samples++ = adpcm_yamaha_expand_nibble(&c->status[0],
+ src[0] & 0x0F);
+ *samples++ = adpcm_yamaha_expand_nibble(&c->status[1],
+ src[0] >> 4 );
+ } else {
+ *samples++ = adpcm_yamaha_expand_nibble(&c->status[0],
+ src[0] & 0x0F);
+ *samples++ = adpcm_yamaha_expand_nibble(&c->status[0],
+ src[0] >> 4 );
+ }
+ src++;
+ }
+ break;
+
+ default:
+ return -1;
+ }
+ *data_size = (uint8_t *)samples - (uint8_t *)data;
+ return src - buf;
+}
+
+#if CONFIG_DECODERS
+#define ADPCM_DECODER(id,name,long_name_) \
+AVCodec name ## _decoder = { \
+ #name, \
+ CODEC_TYPE_AUDIO, \
+ id, \
+ sizeof(ADPCMContext), \
+ adpcm_decode_init, \
+ NULL, \
+ NULL, \
+ adpcm_decode_frame, \
+ /*.capabilities = */0, \
+ /*.next = */NULL, \
+ /*.flush = */NULL, \
+ /*.supported_framerates = */NULL, \
+ /*.pix_fmts = */NULL, \
+ /*.long_name = */NULL_IF_CONFIG_SMALL(long_name_), \
+};
+#else
+#define ADPCM_DECODER(id,name,long_name_)
+#endif
+
+/* Note: Do not forget to add new entries to the Makefile as well. */
+ADPCM_DECODER(CODEC_ID_ADPCM_4XM, adpcm_4xm, "ADPCM 4X Movie");
+ADPCM_DECODER(CODEC_ID_ADPCM_CT, adpcm_ct, "ADPCM Creative Technology");
+ADPCM_DECODER(CODEC_ID_ADPCM_EA, adpcm_ea, "ADPCM Electronic Arts");
+ADPCM_DECODER(CODEC_ID_ADPCM_IMA_AMV, adpcm_ima_amv, "ADPCM IMA AMV");
+ADPCM_DECODER(CODEC_ID_ADPCM_IMA_DK3, adpcm_ima_dk3, "ADPCM IMA Duck DK3");
+ADPCM_DECODER(CODEC_ID_ADPCM_IMA_DK4, adpcm_ima_dk4, "ADPCM IMA Duck DK4");
+ADPCM_DECODER(CODEC_ID_ADPCM_IMA_QT, adpcm_ima_qt, "ADPCM IMA QuickTime");
+ADPCM_DECODER(CODEC_ID_ADPCM_IMA_SMJPEG, adpcm_ima_smjpeg, "ADPCM IMA Loki SDL MJPEG");
+ADPCM_DECODER(CODEC_ID_ADPCM_IMA_WAV, adpcm_ima_wav, "ADPCM IMA WAV");
+ADPCM_DECODER(CODEC_ID_ADPCM_IMA_WS, adpcm_ima_ws, "ADPCM IMA Westwood");
+ADPCM_DECODER(CODEC_ID_ADPCM_MS, adpcm_ms, "ADPCM Microsoft");
+ADPCM_DECODER(CODEC_ID_ADPCM_SBPRO_2, adpcm_sbpro_2, "ADPCM Sound Blaster Pro 2-bit");
+ADPCM_DECODER(CODEC_ID_ADPCM_SBPRO_3, adpcm_sbpro_3, "ADPCM Sound Blaster Pro 2.6-bit");
+ADPCM_DECODER(CODEC_ID_ADPCM_SBPRO_4, adpcm_sbpro_4, "ADPCM Sound Blaster Pro 4-bit");
+ADPCM_DECODER(CODEC_ID_ADPCM_SWF, adpcm_swf, "ADPCM Shockwave Flash");
+ADPCM_DECODER(CODEC_ID_ADPCM_XA, adpcm_xa, "ADPCM CDROM XA");
+ADPCM_DECODER(CODEC_ID_ADPCM_YAMAHA, adpcm_yamaha, "ADPCM Yamaha");
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