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ttadec: remove dead code 

The unused code being removed is for encoding only and therefore is not needed
by the decoder.

Signed-off-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Justin Ruggles <justin.ruggles@gmail.com>
This commit is contained in:
Paul B Mahol 2012-02-17 17:01:22 +00:00 committed by Justin Ruggles
parent 1bab6f852c
commit 323b9da969
1 changed files with 17 additions and 28 deletions
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45
libavcodec/tta.c
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@ -39,7 +39,7 @@
#define MAX_ORDER 16
typedef struct TTAFilter {
int32_t shift, round, error, mode;
int32_t shift, round, error;
int32_t qm[MAX_ORDER];
int32_t dx[MAX_ORDER];
int32_t dl[MAX_ORDER];
@ -84,19 +84,18 @@ static const uint32_t shift_1[] = {
static const uint32_t * const shift_16 = shift_1 + 4;
static const int32_t ttafilter_configs[4][2] = {
{10, 1},
{9, 1},
{10, 1},
{12, 0}
static const int32_t ttafilter_configs[4] = {
10,
9,
10,
12
};
static void ttafilter_init(TTAFilter *c, int32_t shift, int32_t mode) {
static void ttafilter_init(TTAFilter *c, int32_t shift) {
memset(c, 0, sizeof(TTAFilter));
c->shift = shift;
c->round = shift_1[shift-1];
// c->round = 1 << (shift - 1);
c->mode = mode;
}
// FIXME: copy paste from original
@ -111,9 +110,8 @@ static inline void memshl(register int32_t *a, register int32_t *b) {
*a = *b;
}
// FIXME: copy paste from original
// mode=1 encoder, mode=0 decoder
static inline void ttafilter_process(TTAFilter *c, int32_t *in, int32_t mode) {
static inline void ttafilter_process(TTAFilter *c, int32_t *in)
{
register int32_t *dl = c->dl, *qm = c->qm, *dx = c->dx, sum = c->round;
if (!c->error) {
@ -151,22 +149,13 @@ static inline void ttafilter_process(TTAFilter *c, int32_t *in, int32_t mode) {
*(dx-2) = ((*(dl-3) >> 30) | 1) << 1;
*(dx-3) = ((*(dl-4) >> 30) | 1);
// compress
if (mode) {
*dl = *in;
*in -= (sum >> c->shift);
c->error = *in;
} else {
c->error = *in;
*in += (sum >> c->shift);
*dl = *in;
}
c->error = *in;
*in += (sum >> c->shift);
*dl = *in;
if (c->mode) {
*(dl-1) = *dl - *(dl-1);
*(dl-2) = *(dl-1) - *(dl-2);
*(dl-3) = *(dl-2) - *(dl-3);
}
*(dl-1) = *dl - *(dl-1);
*(dl-2) = *(dl-1) - *(dl-2);
*(dl-3) = *(dl-2) - *(dl-3);
memshl(c->dl, c->dl + 1);
memshl(c->dx, c->dx + 1);
@ -353,7 +342,7 @@ static int tta_decode_frame(AVCodecContext *avctx, void *data,
// init per channel states
for (i = 0; i < s->channels; i++) {
s->ch_ctx[i].predictor = 0;
ttafilter_init(&s->ch_ctx[i].filter, ttafilter_configs[s->bps-1][0], ttafilter_configs[s->bps-1][1]);
ttafilter_init(&s->ch_ctx[i].filter, ttafilter_configs[s->bps-1]);
rice_init(&s->ch_ctx[i].rice, 10, 10);
}
@ -411,7 +400,7 @@ static int tta_decode_frame(AVCodecContext *avctx, void *data,
*p = UNFOLD(value);
// run hybrid filter
ttafilter_process(filter, p, 0);
ttafilter_process(filter, p);
// fixed order prediction
#define PRED(x, k) (int32_t)((((uint64_t)x << k) - x) >> k)