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Code Issues Releases Activity

ra144: use macro constants to make the code more understandable.

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This commit is contained in:
Justin Ruggles 2011-09-14 14:42:31 -04:00
parent cadd4d332a
commit f10524d51c
2 changed files with 29 additions and 29 deletions
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40
libavcodec/ra144.c
View File

@ -1544,22 +1544,22 @@ void ff_copy_and_dup(int16_t *target, const int16_t *source, int offset)
int ff_eval_refl(int *refl, const int16_t *coefs, AVCodecContext *avctx)
{
int b, i, j;
int buffer1[10];
int buffer2[10];
int buffer1[LPC_ORDER];
int buffer2[LPC_ORDER];
int *bp1 = buffer1;
int *bp2 = buffer2;
for (i=0; i < 10; i++)
for (i=0; i < LPC_ORDER; i++)
buffer2[i] = coefs[i];
refl[9] = bp2[9];
refl[LPC_ORDER-1] = bp2[LPC_ORDER-1];
if ((unsigned) bp2[9] + 0x1000 > 0x1fff) {
if ((unsigned) bp2[LPC_ORDER-1] + 0x1000 > 0x1fff) {
av_log(avctx, AV_LOG_ERROR, "Overflow. Broken sample?\n");
return 1;
}
for (i=8; i >= 0; i--) {
for (i = LPC_ORDER-2; i >= 0; i--) {
b = 0x1000-((bp2[i+1] * bp2[i+1]) >> 12);
if (!b)
@ -1584,12 +1584,12 @@ int ff_eval_refl(int *refl, const int16_t *coefs, AVCodecContext *avctx)
*/
void ff_eval_coefs(int *coefs, const int *refl)
{
int buffer[10];
int buffer[LPC_ORDER];
int *b1 = buffer;
int *b2 = coefs;
int i, j;
for (i=0; i < 10; i++) {
for (i=0; i < LPC_ORDER; i++) {
b1[i] = refl[i] << 4;
for (j=0; j < i; j++)
@ -1598,7 +1598,7 @@ void ff_eval_coefs(int *coefs, const int *refl)
FFSWAP(int *, b1, b2);
}
for (i=0; i < 10; i++)
for (i=0; i < LPC_ORDER; i++)
coefs[i] >>= 4;
}
@ -1606,7 +1606,7 @@ void ff_int_to_int16(int16_t *out, const int *inp)
{
int i;
for (i=0; i < 10; i++)
for (i = 0; i < LPC_ORDER; i++)
*out++ = *inp++;
}
@ -1629,9 +1629,9 @@ unsigned int ff_rms(const int *data)
{
int i;
unsigned int res = 0x10000;
int b = 10;
int b = LPC_ORDER;
for (i=0; i < 10; i++) {
for (i = 0; i < LPC_ORDER; i++) {
res = (((0x1000000 - data[i]*data[i]) >> 12) * res) >> 12;
if (res == 0)
@ -1648,13 +1648,13 @@ unsigned int ff_rms(const int *data)
int ff_interp(RA144Context *ractx, int16_t *out, int a, int copyold, int energy)
{
int work[10];
int work[LPC_ORDER];
int b = NBLOCKS - a;
int i;
// Interpolate block coefficients from the this frame's forth block and
// last frame's forth block.
for (i=0; i<10; i++)
for (i = 0; i < LPC_ORDER; i++)
out[i] = (a * ractx->lpc_coef[0][i] + b * ractx->lpc_coef[1][i])>> 2;
if (ff_eval_refl(work, out, ractx->avctx)) {
@ -1690,7 +1690,7 @@ void ff_subblock_synthesis(RA144Context *ractx, const uint16_t *lpc_coefs,
int cba_idx, int cb1_idx, int cb2_idx,
int gval, int gain)
{
uint16_t buffer_a[40];
uint16_t buffer_a[BLOCKSIZE];
uint16_t *block;
int m[3];
@ -1711,10 +1711,10 @@ void ff_subblock_synthesis(RA144Context *ractx, const uint16_t *lpc_coefs,
ff_add_wav(block, gain, cba_idx, m, cba_idx? buffer_a: NULL,
ff_cb1_vects[cb1_idx], ff_cb2_vects[cb2_idx]);
memcpy(ractx->curr_sblock, ractx->curr_sblock + 40,
10*sizeof(*ractx->curr_sblock));
memcpy(ractx->curr_sblock, ractx->curr_sblock + BLOCKSIZE,
LPC_ORDER*sizeof(*ractx->curr_sblock));
if (ff_celp_lp_synthesis_filter(ractx->curr_sblock + 10, lpc_coefs,
block, BLOCKSIZE, 10, 1, 0xfff))
memset(ractx->curr_sblock, 0, 50*sizeof(*ractx->curr_sblock));
if (ff_celp_lp_synthesis_filter(ractx->curr_sblock + LPC_ORDER, lpc_coefs,
block, BLOCKSIZE, LPC_ORDER, 1, 0xfff))
memset(ractx->curr_sblock, 0, (LPC_ORDER+BLOCKSIZE)*sizeof(*ractx->curr_sblock));
}

18
libavcodec/ra144dec.c
View File

@ -59,10 +59,10 @@ static int ra144_decode_frame(AVCodecContext * avctx, void *vdata,
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
static const uint8_t sizes[10] = {6, 5, 5, 4, 4, 3, 3, 3, 3, 2};
unsigned int refl_rms[4]; // RMS of the reflection coefficients
uint16_t block_coefs[4][10]; // LPC coefficients of each sub-block
unsigned int lpc_refl[10]; // LPC reflection coefficients of the frame
static const uint8_t sizes[LPC_ORDER] = {6, 5, 5, 4, 4, 3, 3, 3, 3, 2};
unsigned int refl_rms[NBLOCKS]; // RMS of the reflection coefficients
uint16_t block_coefs[NBLOCKS][LPC_ORDER]; // LPC coefficients of each sub-block
unsigned int lpc_refl[LPC_ORDER]; // LPC reflection coefficients of the frame
int i, j;
int out_size;
int16_t *data = vdata;
@ -77,15 +77,15 @@ static int ra144_decode_frame(AVCodecContext * avctx, void *vdata,
return AVERROR(EINVAL);
}
if(buf_size < 20) {
if(buf_size < FRAMESIZE) {
av_log(avctx, AV_LOG_ERROR,
"Frame too small (%d bytes). Truncated file?\n", buf_size);
*data_size = 0;
return buf_size;
}
init_get_bits(&gb, buf, 20 * 8);
init_get_bits(&gb, buf, FRAMESIZE * 8);
for (i=0; i<10; i++)
for (i = 0; i < LPC_ORDER; i++)
lpc_refl[i] = ff_lpc_refl_cb[i][get_bits(&gb, sizes[i])];
ff_eval_coefs(ractx->lpc_coef[0], lpc_refl);
@ -102,7 +102,7 @@ static int ra144_decode_frame(AVCodecContext * avctx, void *vdata,
ff_int_to_int16(block_coefs[3], ractx->lpc_coef[0]);
for (i=0; i < 4; i++) {
for (i=0; i < NBLOCKS; i++) {
do_output_subblock(ractx, block_coefs[i], refl_rms[i], &gb);
for (j=0; j < BLOCKSIZE; j++)
@ -115,7 +115,7 @@ static int ra144_decode_frame(AVCodecContext * avctx, void *vdata,
FFSWAP(unsigned int *, ractx->lpc_coef[0], ractx->lpc_coef[1]);
*data_size = out_size;
return 20;
return FRAMESIZE;
}
AVCodec ff_ra_144_decoder = {