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Merge remote-tracking branch 'qatar/master'

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* qatar/master:
  imc: support mode 1

Merged-by: Michael Niedermayer <michaelni@gmx.at>
pull/37/head
Michael Niedermayer 11 years ago
parent 6063f012f2 4eb4bb3a02
commit 09ea5048a9
1 changed files with 120 additions and 57 deletions
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  1. 177
      libavcodec/imc.c

177
libavcodec/imc.c
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@ -101,6 +101,8 @@ typedef struct {
DECLARE_ALIGNED(32, FFTComplex, samples)[COEFFS / 2];
float *out_samples;
int coef0_pos;
int8_t cyclTab[32], cyclTab2[32];
float weights1[31], weights2[31];
} IMCContext;
@ -337,6 +339,17 @@ static void imc_read_level_coeffs(IMCContext *q, int stream_format_code,
}
}
static void imc_read_level_coeffs_raw(IMCContext *q, int stream_format_code,
int *levlCoeffs)
{
int i;
q->coef0_pos = get_bits(&q->gb, 5);
levlCoeffs[0] = get_bits(&q->gb, 7);
for (i = 1; i < BANDS; i++)
levlCoeffs[i] = get_bits(&q->gb, 4);
}
static void imc_decode_level_coefficients(IMCContext *q, int *levlCoeffBuf,
float *flcoeffs1, float *flcoeffs2)
{
@ -391,6 +404,28 @@ static void imc_decode_level_coefficients2(IMCContext *q, int *levlCoeffBuf,
}
}
static void imc_decode_level_coefficients_raw(IMCContext *q, int *levlCoeffBuf,
float *flcoeffs1, float *flcoeffs2)
{
int i, level, pos;
float tmp, tmp2;
pos = q->coef0_pos;
flcoeffs1[pos] = 20000.0 / pow (2, levlCoeffBuf[0] * 0.18945); // 0.18945 = log2(10) * 0.05703125
flcoeffs2[pos] = log2f(flcoeffs1[0]);
tmp = flcoeffs1[pos];
tmp2 = flcoeffs2[pos];
levlCoeffBuf++;
for (i = 0; i < BANDS; i++) {
if (i == pos)
continue;
level = *levlCoeffBuf++;
flcoeffs1[i] = tmp * powf(10.0, -level * 0.4375); //todo tab
flcoeffs2[i] = tmp2 - 1.4533435415 * level; // 1.4533435415 = log2(10) * 0.4375
}
}
/**
* Perform bit allocation depending on bits available
*/
@ -763,12 +798,56 @@ static int imc_get_coeffs(IMCContext *q, IMCChannel *chctx)
return 0;
}
static void imc_refine_bit_allocation(IMCContext *q, IMCChannel *chctx)
{
int i, j;
int bits, summer;
for (i = 0; i < BANDS; i++) {
chctx->sumLenArr[i] = 0;
chctx->skipFlagRaw[i] = 0;
for (j = band_tab[i]; j < band_tab[i + 1]; j++)
chctx->sumLenArr[i] += chctx->CWlengthT[j];
if (chctx->bandFlagsBuf[i])
if ((((band_tab[i + 1] - band_tab[i]) * 1.5) > chctx->sumLenArr[i]) && (chctx->sumLenArr[i] > 0))
chctx->skipFlagRaw[i] = 1;
}
imc_get_skip_coeff(q, chctx);
for (i = 0; i < BANDS; i++) {
chctx->flcoeffs6[i] = chctx->flcoeffs1[i];
/* band has flag set and at least one coded coefficient */
if (chctx->bandFlagsBuf[i] && (band_tab[i + 1] - band_tab[i]) != chctx->skipFlagCount[i]) {
chctx->flcoeffs6[i] *= q->sqrt_tab[ band_tab[i + 1] - band_tab[i]] /
q->sqrt_tab[(band_tab[i + 1] - band_tab[i] - chctx->skipFlagCount[i])];
}
}
/* calculate bits left, bits needed and adjust bit allocation */
bits = summer = 0;
for (i = 0; i < BANDS; i++) {
if (chctx->bandFlagsBuf[i]) {
for (j = band_tab[i]; j < band_tab[i + 1]; j++) {
if (chctx->skipFlags[j]) {
summer += chctx->CWlengthT[j];
chctx->CWlengthT[j] = 0;
}
}
bits += chctx->skipFlagBits[i];
summer -= chctx->skipFlagBits[i];
}
}
imc_adjust_bit_allocation(q, chctx, summer);
}
static int imc_decode_block(AVCodecContext *avctx, IMCContext *q, int ch)
{
int stream_format_code;
int imc_hdr, i, j, ret;
int flag;
int bits, summer;
int bits;
int counter, bitscount;
IMCChannel *chctx = q->chctx + ch;
@ -782,11 +861,6 @@ static int imc_decode_block(AVCodecContext *avctx, IMCContext *q, int ch)
}
stream_format_code = get_bits(&q->gb, 3);
if (stream_format_code & 1) {
avpriv_request_sample(avctx, "Stream format %X", stream_format_code);
return AVERROR_PATCHWELCOME;
}
if (stream_format_code & 0x04)
chctx->decoder_reset = 1;
@ -799,7 +873,13 @@ static int imc_decode_block(AVCodecContext *avctx, IMCContext *q, int ch)
}
flag = get_bits1(&q->gb);
imc_read_level_coeffs(q, stream_format_code, chctx->levlCoeffBuf);
if (stream_format_code & 0x1)
imc_decode_level_coefficients_raw(q, chctx->levlCoeffBuf,
chctx->flcoeffs1, chctx->flcoeffs2);
else if (stream_format_code & 0x1)
imc_read_level_coeffs_raw(q, stream_format_code, chctx->levlCoeffBuf);
else
imc_read_level_coeffs(q, stream_format_code, chctx->levlCoeffBuf);
if (stream_format_code & 0x4)
imc_decode_level_coefficients(q, chctx->levlCoeffBuf,
@ -818,20 +898,31 @@ static int imc_decode_block(AVCodecContext *avctx, IMCContext *q, int ch)
memcpy(chctx->old_floor, chctx->flcoeffs1, 32 * sizeof(float));
counter = 0;
for (i = 0; i < BANDS; i++) {
if (chctx->levlCoeffBuf[i] == 16) {
chctx->bandWidthT[i] = 0;
counter++;
} else
chctx->bandWidthT[i] = band_tab[i + 1] - band_tab[i];
}
memset(chctx->bandFlagsBuf, 0, BANDS * sizeof(int));
for (i = 0; i < BANDS - 1; i++) {
if (chctx->bandWidthT[i])
chctx->bandFlagsBuf[i] = get_bits1(&q->gb);
}
if (stream_format_code & 0x1) {
for (i = 0; i < BANDS; i++) {
chctx->bandWidthT[i] = band_tab[i + 1] - band_tab[i];
chctx->bandFlagsBuf[i] = 0;
chctx->flcoeffs3[i] = chctx->flcoeffs2[i] * 2;
chctx->flcoeffs5[i] = 1.0;
}
} else {
for (i = 0; i < BANDS; i++) {
if (chctx->levlCoeffBuf[i] == 16) {
chctx->bandWidthT[i] = 0;
counter++;
} else
chctx->bandWidthT[i] = band_tab[i + 1] - band_tab[i];
}
memset(chctx->bandFlagsBuf, 0, BANDS * sizeof(int));
for (i = 0; i < BANDS - 1; i++)
if (chctx->bandWidthT[i])
chctx->bandFlagsBuf[i] = get_bits1(&q->gb);
imc_calculate_coeffs(q, chctx->flcoeffs1, chctx->flcoeffs2, chctx->bandWidthT, chctx->flcoeffs3, chctx->flcoeffs5);
imc_calculate_coeffs(q, chctx->flcoeffs1, chctx->flcoeffs2,
chctx->bandWidthT, chctx->flcoeffs3,
chctx->flcoeffs5);
}
bitscount = 0;
/* first 4 bands will be assigned 5 bits per coefficient */
@ -843,7 +934,10 @@ static int imc_decode_block(AVCodecContext *avctx, IMCContext *q, int ch)
chctx->CWlengthT[1] = 5;
chctx->CWlengthT[2] = 5;
for (i = 1; i < 4; i++) {
bits = (chctx->levlCoeffBuf[i] == 16) ? 0 : 5;
if (stream_format_code & 0x1)
bits = 5;
else
bits = (chctx->levlCoeffBuf[i] == 16) ? 0 : 5;
chctx->bitsBandT[i] = bits;
for (j = band_tab[i]; j < band_tab[i + 1]; j++) {
chctx->CWlengthT[j] = bits;
@ -865,43 +959,12 @@ static int imc_decode_block(AVCodecContext *avctx, IMCContext *q, int ch)
return ret;
}
for (i = 0; i < BANDS; i++) {
chctx->sumLenArr[i] = 0;
chctx->skipFlagRaw[i] = 0;
for (j = band_tab[i]; j < band_tab[i + 1]; j++)
chctx->sumLenArr[i] += chctx->CWlengthT[j];
if (chctx->bandFlagsBuf[i])
if ((((band_tab[i + 1] - band_tab[i]) * 1.5) > chctx->sumLenArr[i]) && (chctx->sumLenArr[i] > 0))
chctx->skipFlagRaw[i] = 1;
}
imc_get_skip_coeff(q, chctx);
for (i = 0; i < BANDS; i++) {
chctx->flcoeffs6[i] = chctx->flcoeffs1[i];
/* band has flag set and at least one coded coefficient */
if (chctx->bandFlagsBuf[i] && (band_tab[i + 1] - band_tab[i]) != chctx->skipFlagCount[i]) {
chctx->flcoeffs6[i] *= q->sqrt_tab[ band_tab[i + 1] - band_tab[i]] /
q->sqrt_tab[(band_tab[i + 1] - band_tab[i] - chctx->skipFlagCount[i])];
}
}
/* calculate bits left, bits needed and adjust bit allocation */
bits = summer = 0;
for (i = 0; i < BANDS; i++) {
if (chctx->bandFlagsBuf[i]) {
for (j = band_tab[i]; j < band_tab[i + 1]; j++) {
if (chctx->skipFlags[j]) {
summer += chctx->CWlengthT[j];
chctx->CWlengthT[j] = 0;
}
}
bits += chctx->skipFlagBits[i];
summer -= chctx->skipFlagBits[i];
}
if (stream_format_code & 0x1) {
for (i = 0; i < BANDS; i++)
chctx->skipFlags[i] = 0;
} else {
imc_refine_bit_allocation(q, chctx);
}
imc_adjust_bit_allocation(q, chctx, summer);
for (i = 0; i < BANDS; i++) {
chctx->sumLenArr[i] = 0;

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