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-rw-r--r--libavcodec/ac3dec.c314
1 files changed, 141 insertions, 173 deletions
diff --git a/libavcodec/ac3dec.c b/libavcodec/ac3dec.c
index 18328b1fad..66d415dff9 100644
--- a/libavcodec/ac3dec.c
+++ b/libavcodec/ac3dec.c
@@ -34,6 +34,7 @@
#include "avutil.h"
#include "common.h"
#include "math.h"
+#include "crc.h"
#define N 512 /* constant for IMDCT Block size */
@@ -158,8 +159,8 @@ typedef struct {
DECLARE_ALIGNED_16(float, transform_coeffs[MAX_CHANNELS][BLOCK_SIZE]);
/* For IMDCT. */
- FFTContext fft_64; //N/8 point IFFT context
- FFTContext fft_128; //N/4 point IFFT context
+ MDCTContext imdct_512; //N/8 point IFFT context
+ MDCTContext imdct_256; //N/4 point IFFT context
DECLARE_ALIGNED_16(float, output[MAX_CHANNELS][BLOCK_SIZE]);
DECLARE_ALIGNED_16(float, delay[MAX_CHANNELS][BLOCK_SIZE]);
DECLARE_ALIGNED_16(float, tmp_imdct[BLOCK_SIZE]);
@@ -398,8 +399,8 @@ static int ac3_decode_init(AVCodecContext *avctx)
AC3DecodeContext *ctx = avctx->priv_data;
ac3_tables_init();
- ff_fft_init(&ctx->fft_64, 6, 1);
- ff_fft_init(&ctx->fft_128, 7, 1);
+ ff_mdct_init(&ctx->imdct_256, 8, 1);
+ ff_mdct_init(&ctx->imdct_512, 9, 1);
dither_seed(&ctx->dith_state, 0);
return 0;
@@ -838,9 +839,9 @@ static int get_transform_coeffs_cpling(AC3DecodeContext *ctx, mant_groups *m)
case 0:
for (ch = 0; ch < ctx->nfchans; ch++)
if (((ctx->chincpl) >> ch) & 1) {
- if (!(((ctx->dithflag) >> ch) & 1)) {
+ if ((ctx->dithflag >> ch) & 1) {
TRANSFORM_COEFF(cplcoeff, dither_int16(&ctx->dith_state), exps[start], scale_factors);
- ctx->transform_coeffs[ch + 1][start] = cplcoeff * cplcos[ch];
+ ctx->transform_coeffs[ch + 1][start] = cplcoeff * cplcos[ch] * LEVEL_MINUS_3DB;
} else
ctx->transform_coeffs[ch + 1][start] = 0;
}
@@ -887,7 +888,7 @@ static int get_transform_coeffs_cpling(AC3DecodeContext *ctx, mant_groups *m)
break;
default:
- TRANSFORM_COEFF(cplcoeff, get_bits(gb, qntztab[tbap]) << (16 - qntztab[tbap]),
+ TRANSFORM_COEFF(cplcoeff, get_sbits(gb, qntztab[tbap]) << (16 - qntztab[tbap]),
exps[start], scale_factors);
}
for (ch = 0; ch < ctx->nfchans; ch++)
@@ -932,13 +933,13 @@ static int get_transform_coeffs_ch(AC3DecodeContext *ctx, int ch_index, mant_gro
tbap = bap[i];
switch (tbap) {
case 0:
- if (dithflag) {
+ if (!dithflag) {
coeffs[i] = 0;
continue;
}
else {
TRANSFORM_COEFF(coeffs[i], dither_int16(&ctx->dith_state), exps[i], factors);
- coeffs[i] *= LEVEL_PLUS_3DB;
+ coeffs[i] *= LEVEL_MINUS_3DB;
continue;
}
@@ -983,7 +984,7 @@ static int get_transform_coeffs_ch(AC3DecodeContext *ctx, int ch_index, mant_gro
continue;
default:
- TRANSFORM_COEFF(coeffs[i], get_bits(gb, qntztab[tbap]) << (16 - qntztab[tbap]), exps[i], factors);
+ TRANSFORM_COEFF(coeffs[i], get_sbits(gb, qntztab[tbap]) << (16 - qntztab[tbap]), exps[i], factors);
continue;
}
}
@@ -1075,6 +1076,7 @@ static void get_downmix_coeffs(AC3DecodeContext *ctx)
int to = ctx->blkoutput;
float clev = clevs[ctx->cmixlev];
float slev = slevs[ctx->surmixlev];
+ float nf = 1.0; //normalization factor for downmix coeffs
if (to == AC3_OUTPUT_UNMODIFIED)
return;
@@ -1084,107 +1086,142 @@ static void get_downmix_coeffs(AC3DecodeContext *ctx)
switch (to) {
case AC3_OUTPUT_MONO:
case AC3_OUTPUT_STEREO: /* We Assume that sum of both mono channels is requested */
- ctx->chcoeffs[0] *= LEVEL_MINUS_6DB;
- ctx->chcoeffs[1] *= LEVEL_MINUS_6DB;
+ nf = 0.5;
+ ctx->chcoeffs[0] *= nf;
+ ctx->chcoeffs[1] *= nf;
break;
}
break;
case AC3_INPUT_MONO:
switch (to) {
case AC3_OUTPUT_STEREO:
- ctx->chcoeffs[0] *= LEVEL_MINUS_3DB;
+ nf = LEVEL_MINUS_3DB;
+ ctx->chcoeffs[0] *= nf;
break;
}
break;
case AC3_INPUT_STEREO:
switch (to) {
case AC3_OUTPUT_MONO:
- ctx->chcoeffs[0] *= LEVEL_MINUS_3DB;
- ctx->chcoeffs[1] *= LEVEL_MINUS_3DB;
+ nf = LEVEL_MINUS_3DB;
+ ctx->chcoeffs[0] *= nf;
+ ctx->chcoeffs[1] *= nf;
break;
}
break;
case AC3_INPUT_3F:
switch (to) {
case AC3_OUTPUT_MONO:
- ctx->chcoeffs[0] *= LEVEL_MINUS_3DB;
- ctx->chcoeffs[2] *= LEVEL_MINUS_3DB;
- ctx->chcoeffs[1] *= (clev * LEVEL_PLUS_3DB);
+ nf = LEVEL_MINUS_3DB / (1.0 + clev);
+ ctx->chcoeffs[0] *= (nf * LEVEL_MINUS_3DB);
+ ctx->chcoeffs[2] *= (nf * LEVEL_MINUS_3DB);
+ ctx->chcoeffs[1] *= ((nf * clev * LEVEL_MINUS_3DB) / 2.0);
break;
case AC3_OUTPUT_STEREO:
- ctx->chcoeffs[1] *= clev;
+ nf = 1.0 / (1.0 + clev);
+ ctx->chcoeffs[0] *= nf;
+ ctx->chcoeffs[2] *= nf;
+ ctx->chcoeffs[1] *= (nf * clev);
break;
}
break;
case AC3_INPUT_2F_1R:
switch (to) {
case AC3_OUTPUT_MONO:
- ctx->chcoeffs[0] *= LEVEL_MINUS_3DB;
- ctx->chcoeffs[1] *= LEVEL_MINUS_3DB;
- ctx->chcoeffs[2] *= slev * LEVEL_MINUS_3DB;
+ nf = 2.0 * LEVEL_MINUS_3DB / (2.0 + slev);
+ ctx->chcoeffs[0] *= (nf * LEVEL_MINUS_3DB);
+ ctx->chcoeffs[1] *= (nf * LEVEL_MINUS_3DB);
+ ctx->chcoeffs[2] *= (nf * slev * LEVEL_MINUS_3DB);
break;
case AC3_OUTPUT_STEREO:
- ctx->chcoeffs[2] *= slev * LEVEL_MINUS_3DB;
+ nf = 1.0 / (1.0 + (slev * LEVEL_MINUS_3DB));
+ ctx->chcoeffs[0] *= nf;
+ ctx->chcoeffs[1] *= nf;
+ ctx->chcoeffs[2] *= (nf * slev * LEVEL_MINUS_3DB);
break;
case AC3_OUTPUT_DOLBY:
- ctx->chcoeffs[2] *= LEVEL_MINUS_3DB;
+ nf = 1.0 / (1.0 + LEVEL_MINUS_3DB);
+ ctx->chcoeffs[0] *= nf;
+ ctx->chcoeffs[1] *= nf;
+ ctx->chcoeffs[2] *= (nf * LEVEL_MINUS_3DB);
break;
}
break;
case AC3_INPUT_3F_1R:
switch (to) {
case AC3_OUTPUT_MONO:
- ctx->chcoeffs[0] *= LEVEL_MINUS_3DB;
- ctx->chcoeffs[2] *= LEVEL_MINUS_3DB;
- ctx->chcoeffs[1] *= clev * LEVEL_PLUS_3DB;
- ctx->chcoeffs[3] *= slev * LEVEL_MINUS_3DB;
+ nf = LEVEL_MINUS_3DB / (1.0 + clev + (slev / 2.0));
+ ctx->chcoeffs[0] *= (nf * LEVEL_MINUS_3DB);
+ ctx->chcoeffs[2] *= (nf * LEVEL_MINUS_3DB);
+ ctx->chcoeffs[1] *= (nf * clev * LEVEL_PLUS_3DB);
+ ctx->chcoeffs[3] *= (nf * slev * LEVEL_MINUS_3DB);
break;
case AC3_OUTPUT_STEREO:
- ctx->chcoeffs[1] *= clev;
- ctx->chcoeffs[3] *= slev * LEVEL_MINUS_3DB;
+ nf = 1.0 / (1.0 + clev + (slev * LEVEL_MINUS_3DB));
+ ctx->chcoeffs[0] *= nf;
+ ctx->chcoeffs[2] *= nf;
+ ctx->chcoeffs[1] *= (nf * clev);
+ ctx->chcoeffs[3] *= (nf * slev * LEVEL_MINUS_3DB);
break;
case AC3_OUTPUT_DOLBY:
- ctx->chcoeffs[1] *= LEVEL_MINUS_3DB;
- ctx->chcoeffs[3] *= LEVEL_MINUS_3DB;
+ nf = 1.0 / (1.0 + (2.0 * LEVEL_MINUS_3DB));
+ ctx->chcoeffs[0] *= nf;
+ ctx->chcoeffs[1] *= nf;
+ ctx->chcoeffs[1] *= (nf * LEVEL_MINUS_3DB);
+ ctx->chcoeffs[3] *= (nf * LEVEL_MINUS_3DB);
break;
}
break;
case AC3_INPUT_2F_2R:
switch (to) {
case AC3_OUTPUT_MONO:
- ctx->chcoeffs[0] *= LEVEL_MINUS_3DB;
- ctx->chcoeffs[1] *= LEVEL_MINUS_3DB;
- ctx->chcoeffs[2] *= slev * LEVEL_MINUS_3DB;
- ctx->chcoeffs[3] *= slev * LEVEL_MINUS_3DB;
+ nf = LEVEL_MINUS_3DB / (1.0 + slev);
+ ctx->chcoeffs[0] *= (nf * LEVEL_MINUS_3DB);
+ ctx->chcoeffs[1] *= (nf * LEVEL_MINUS_3DB);
+ ctx->chcoeffs[2] *= (nf * slev * LEVEL_MINUS_3DB);
+ ctx->chcoeffs[3] *= (nf * slev * LEVEL_MINUS_3DB);
break;
case AC3_OUTPUT_STEREO:
- ctx->chcoeffs[2] *= slev;
- ctx->chcoeffs[3] *= slev;
+ nf = 1.0 / (1.0 + slev);
+ ctx->chcoeffs[0] *= nf;
+ ctx->chcoeffs[1] *= nf;
+ ctx->chcoeffs[2] *= (nf * slev);
+ ctx->chcoeffs[3] *= (nf * slev);
break;
case AC3_OUTPUT_DOLBY:
- ctx->chcoeffs[2] *= LEVEL_MINUS_3DB;
- ctx->chcoeffs[3] *= LEVEL_MINUS_3DB;
+ nf = 1.0 / (1.0 + (2.0 * LEVEL_MINUS_3DB));
+ ctx->chcoeffs[0] *= nf;
+ ctx->chcoeffs[1] *= nf;
+ ctx->chcoeffs[2] *= (nf * LEVEL_MINUS_3DB);
+ ctx->chcoeffs[3] *= (nf * LEVEL_MINUS_3DB);
break;
}
break;
case AC3_INPUT_3F_2R:
switch (to) {
case AC3_OUTPUT_MONO:
- ctx->chcoeffs[0] *= LEVEL_MINUS_3DB;
- ctx->chcoeffs[2] *= LEVEL_MINUS_3DB;
- ctx->chcoeffs[1] *= clev * LEVEL_PLUS_3DB;
- ctx->chcoeffs[3] *= slev * LEVEL_MINUS_3DB;
- ctx->chcoeffs[4] *= slev * LEVEL_MINUS_3DB;
+ nf = LEVEL_MINUS_3DB / (1.0 + clev + slev);
+ ctx->chcoeffs[0] *= (nf * LEVEL_MINUS_3DB);
+ ctx->chcoeffs[2] *= (nf * LEVEL_MINUS_3DB);
+ ctx->chcoeffs[1] *= (nf * clev * LEVEL_PLUS_3DB);
+ ctx->chcoeffs[3] *= (nf * slev * LEVEL_MINUS_3DB);
+ ctx->chcoeffs[4] *= (nf * slev * LEVEL_MINUS_3DB);
break;
case AC3_OUTPUT_STEREO:
- ctx->chcoeffs[1] *= clev;
- ctx->chcoeffs[3] *= slev;
- ctx->chcoeffs[4] *= slev;
+ nf = 1.0 / (1.0 + clev + slev);
+ ctx->chcoeffs[0] *= nf;
+ ctx->chcoeffs[2] *= nf;
+ ctx->chcoeffs[1] *= (nf * clev);
+ ctx->chcoeffs[3] *= (nf * slev);
+ ctx->chcoeffs[4] *= (nf * slev);
break;
case AC3_OUTPUT_DOLBY:
- ctx->chcoeffs[1] *= LEVEL_MINUS_3DB;
- ctx->chcoeffs[3] *= LEVEL_MINUS_3DB;
- ctx->chcoeffs[4] *= LEVEL_MINUS_3DB;
+ nf = 1.0 / (1.0 + (3.0 * LEVEL_MINUS_3DB));
+ ctx->chcoeffs[0] *= nf;
+ ctx->chcoeffs[1] *= nf;
+ ctx->chcoeffs[1] *= (nf * LEVEL_MINUS_3DB);
+ ctx->chcoeffs[3] *= (nf * LEVEL_MINUS_3DB);
+ ctx->chcoeffs[4] *= (nf * LEVEL_MINUS_3DB);
break;
}
break;
@@ -1529,102 +1566,39 @@ static void dump_floats(const char *name, int prec, const float *tab, int n)
(pim) = _are * _bim + _aim * _bre;\
}
-static void do_imdct_256(FFTContext *fft_ctx, float *coeffs, float *output,
- float *delay, float *tmp_imdct, float *tmp_output)
+static void do_imdct_256(AC3DecodeContext *ctx, int chindex)
{
- int k, n2, n4, n8;
+ int k;
float x1[128], x2[128];
- FFTComplex *z1 = (FFTComplex *)tmp_imdct;
- FFTComplex *z2 = (FFTComplex *)(tmp_imdct + 128);
- n2 = N / 2;
- n4 = N / 4;
- n8 = N / 8;
-
- for (k = 0; k < n4; k++) {
- x1[k] = coeffs[2 * k];
- x2[k] = coeffs[2 * k + 1];
- }
-
- /* Pre IFFT Complex Multiply Step. */
- for (k = 0; k < n8; k++) {
- CMUL(z1[k].re, z1[k].im, x1[n4 - 2 * k - 1], x1[2 * k], x_cos2[k], x_sin2[k]);
- CMUL(z2[k].re, z2[k].im, x2[n4 - 2 * k - 1], x2[2 * k], x_cos2[k], x_sin2[k]);
- }
-
- /* N/8 pointe complex IFFT. */
- ff_fft_permute(fft_ctx, z1);
- ff_fft_calc(fft_ctx, z1);
- ff_fft_permute(fft_ctx, z2);
- ff_fft_calc(fft_ctx, z2);
-
-
- /* Post IFFT Complex Multiply Step. */
- for (k = 0; k < n8; k++) {
- CMUL(z1[k].re, z1[k].im, z1[k].re, z1[k].im, x_cos2[k], x_sin2[k]);
- CMUL(z2[k].re, z2[k].im, z2[k].re, z2[k].im, x_cos2[k], x_sin2[k]);
+ for (k = 0; k < N / 4; k++) {
+ x1[k] = ctx->transform_coeffs[chindex][2 * k];
+ x2[k] = ctx->transform_coeffs[chindex][2 * k + 1];
}
- /* Windowing and de-interleaving step. */
- for (k = 0; k < n8; k++) {
- tmp_output[2 * k] = -z1[k].im * window[2 * k];
- tmp_output[2 * k + 1] = z1[n8 - k - 1].re * window[2 * k + 1];
- tmp_output[n4 + 2 * k] = -z1[k].re * window[n4 + 2 * k];
- tmp_output[n4 + 2 * k + 1] = z1[n8 - k - 1].im * window[n4 + 2 * k + 1];
- tmp_output[n2 + 2 * k] = -z2[k].re * window[n2 - 2 * k - 1];
- tmp_output[n2 + 2* k + 1] = z2[n8 - k - 1].im * window[n2 - 2 * k - 2];
- tmp_output[3 * n4 + 2 * k] = z2[k].im * window[n4 - 2 * k - 1] ;
- tmp_output[3 * n4 + 2 * k + 1] = -z2[n8 - k - 1].re * window[n4 - 2 * k - 2] ;
- }
+ ff_imdct_calc(&ctx->imdct_256, ctx->tmp_output, x1, ctx->tmp_imdct);
+ ff_imdct_calc(&ctx->imdct_256, ctx->tmp_output + 256, x2, ctx->tmp_imdct);
- /* Overlap and add step. */
- for (k = 0; k < n2; k++) {
- output[k] = 2 * (tmp_output[k] + delay[k]);
- delay[k] = tmp_output[n2 + k];
+ for (k = 0; k < N / 2; k++) {
+ ctx->output[chindex][k] = ctx->tmp_output[k] * window[k] + ctx->delay[chindex][k];
+ //dump_floats("samples", 10, ctx->output[chindex], 256);
+ ctx->delay[chindex][k] = ctx->tmp_output[N / 2 + k] * window[255 - k];
}
}
-static void do_imdct_512(FFTContext *fft_ctx, float *coeffs, float *output,
- float *delay, float *tmp_imdct, float *tmp_output)
+static void do_imdct_512(AC3DecodeContext *ctx, int chindex)
{
- int k, n2, n4, n8;
- FFTComplex *z = (FFTComplex *)tmp_imdct;
+ int k;
- n2 = N / 2;
- n4 = N / 4;
- n8 = N / 8;
-
-
- /* Pre IFFT Complex Multiply Step. */
- for (k = 0; k < n4; k++)
- CMUL(z[k].re, z[k].im, coeffs[n2 - 2 * k - 1], coeffs[2 * k], x_cos1[k], x_sin1[k]);
-
- /* Permutation needed before calling ff_fft_calc. */
- ff_fft_permute(fft_ctx, z);
-
- /* N/4 pointe complex IFFT. */
- ff_fft_calc(fft_ctx, z);
-
- /* Post IFFT Complex Multiply Step. */
- for (k = 0; k < n4; k++)
- CMUL(z[k].re, z[k].im, z[k].re, z[k].im, x_cos1[k], x_sin1[k]);
-
- /* Windowing and de-interleaving step. */
- for (k = 0; k < n8; k++) {
- tmp_output[2 * k] = -z[n8 + k].im * window[2 * k];
- tmp_output[2 * k + 1] = z[n8 - k - 1].re * window[2 * k + 1];
- tmp_output[n4 + 2 * k] = -z[k].re * window[n4 + 2 * k];
- tmp_output[n4 + 2 * k + 1] = z[n4 - k - 1].im * window[n4 + 2 * k + 1];
- tmp_output[n2 + 2 * k] = -z[n8 + k].re * window[n2 - 2 * k - 1];
- tmp_output[n2 + 2* k + 1] = z[n8 - k - 1].im * window[n2 - 2 * k - 2];
- tmp_output[3 * n4 + 2 * k] = z[k].im * window[n4 - 2 * k - 1] ;
- tmp_output[3 * n4 + 2 * k + 1] = -z[n4 - k - 1].re * window[n4 - 2 * k - 2] ;
- }
+ ff_imdct_calc(&ctx->imdct_512, ctx->tmp_output,
+ ctx->transform_coeffs[chindex], ctx->tmp_imdct);
+ //ff_imdct_calc_ac3_512(&ctx->imdct_512, ctx->tmp_output, ctx->transform_coeffs[chindex],
+ // ctx->tmp_imdct, window);
- /* Overlap and add step. */
- for (k = 0; k < n2; k++) {
- output[k] = 2 * (tmp_output[k] + delay[k]);
- delay[k] = tmp_output[n2 + k];
+ for (k = 0; k < N / 2; k++) {
+ ctx->output[chindex][k] = ctx->tmp_output[k] * window[k] + ctx->delay[chindex][k];
+ //dump_floats("samples", 10, ctx->output[chindex], 256);
+ ctx->delay[chindex][k] = ctx->tmp_output[N / 2 + k] * window[255 - k];
}
}
@@ -1633,18 +1607,13 @@ static inline void do_imdct(AC3DecodeContext *ctx)
int i;
if (ctx->blkoutput & AC3_OUTPUT_LFEON) {
- do_imdct_512(&ctx->fft_128, ctx->transform_coeffs[0], ctx->output[0],
- ctx->delay[0], ctx->tmp_imdct, ctx->tmp_output);
+ do_imdct_512(ctx, 0);
}
for (i = 0; i < ctx->nfchans; i++) {
- if (!((ctx->blksw >> i) & 1)) {
- do_imdct_512(&ctx->fft_128, ctx->transform_coeffs[i + 1], ctx->output[i + 1],
- ctx->delay[i + 1], ctx->tmp_imdct, ctx->tmp_output);
- } else {
- av_log(NULL, AV_LOG_INFO, "block switching enabled.\n");
- do_imdct_256(&ctx->fft_64, ctx->transform_coeffs[i + 1], ctx->output[i + 1],
- ctx->delay[i + 1], ctx->tmp_imdct, ctx->tmp_output);
- }
+ if ((ctx->blksw >> i) & 1)
+ do_imdct_256(ctx, i + 1);
+ else
+ do_imdct_512(ctx, i + 1);
}
}
@@ -1661,7 +1630,7 @@ static int ac3_parse_audio_block(AC3DecodeContext * ctx)
int dynrng, chbwcod, ngrps, cplabsexp, skipl;
for (i = 0; i < 5; i++)
- ctx->chcoeffs[i] = 1.0;
+ ctx->chcoeffs[i] = 2.0;
for (i = 0; i < nfchans; i++) /*block switch flag */
ctx->blksw |= get_bits1(gb) << i;
@@ -1670,14 +1639,14 @@ static int ac3_parse_audio_block(AC3DecodeContext * ctx)
ctx->dithflag |= get_bits1(gb) << i;
if (get_bits1(gb)) { /* dynamic range */
- dynrng = get_bits(gb, 8);
+ dynrng = get_sbits(gb, 8);
drange = ((((dynrng & 0x1f) | 0x20) << 13) * scale_factors[3 - (dynrng >> 5)]);
for (i = 0; i < nfchans; i++)
ctx->chcoeffs[i] *= drange;
}
if (acmod == 0x00 && get_bits1(gb)) { /* dynamic range 1+1 mode */
- dynrng = get_bits(gb, 8);
+ dynrng = get_sbits(gb, 8);
drange = ((((dynrng & 0x1f) | 0x20) << 13) * scale_factors[3 - (dynrng >> 5)]);
ctx->chcoeffs[1] *= drange;
}
@@ -1931,9 +1900,12 @@ static int ac3_parse_audio_block(AC3DecodeContext * ctx)
static inline int16_t convert(float f)
{
- int a;
- a = lrintf(f * 32767.0);
- return ((int16_t)a);
+ if (f >= 1.0)
+ return 32767;
+ else if (f <= -1.0)
+ return -32768;
+ else
+ return (lrintf(f * 32767.0));
}
static int frame_count = 0;
@@ -1943,7 +1915,8 @@ static int ac3_decode_frame(AVCodecContext * avctx, void *data, int *data_size,
AC3DecodeContext *ctx = (AC3DecodeContext *)avctx->priv_data;
int frame_start;
int16_t *out_samples = (int16_t *)data;
- int i, j, k, value;
+ int i, j, k, value, fs_58;
+ uint16_t crc1;
av_log(NULL, AV_LOG_INFO, "decoding frame %d buf_size = %d\n", frame_count++, buf_size);
@@ -1966,38 +1939,34 @@ static int ac3_decode_frame(AVCodecContext * avctx, void *data, int *data_size,
return buf_size;
}
- //Check for the errors.
- /* if (ac3_error_check(ctx)) {
- *data_size = 0;
- return -1;
- } */
-
//Parse the BSI.
//If 'bsid' is not valid decoder shall not decode the audio as per the standard.
ac3_parse_bsi(ctx);
avctx->sample_rate = ctx->sampling_rate;
avctx->bit_rate = ctx->bit_rate;
- avctx->channels = 0;
+
if (avctx->channels == 0) {
ctx->blkoutput |= AC3_OUTPUT_UNMODIFIED;
- avctx->channels = ctx->nfchans;
- } else if (ctx->nfchans + ctx->lfeon < avctx->channels) {
- av_log(avctx, AV_LOG_INFO, "ac3_decoder: AC3 Source Channels Are Less Then Specified %d: Output to %d Channels\n",
- avctx->channels, ctx->nfchans + ctx->lfeon);
- avctx->channels = ctx->nfchans;
- ctx->blkoutput |= AC3_OUTPUT_UNMODIFIED;
- } else if (avctx->channels == 1) {
+ if (ctx->lfeon)
+ ctx->blkoutput |= AC3_OUTPUT_LFEON;
+ avctx->channels = ctx->nfchans + ctx->lfeon;
+ }
+ else if (avctx->channels == 1)
ctx->blkoutput |= AC3_OUTPUT_MONO;
- } else if (avctx->channels == 2) {
+ else if (avctx->channels == 2) {
if (ctx->dsurmod == 0x02)
ctx->blkoutput |= AC3_OUTPUT_DOLBY;
else
ctx->blkoutput |= AC3_OUTPUT_STEREO;
}
- if (ctx->lfeon) {
- avctx->channels++;
- ctx->blkoutput |= AC3_OUTPUT_LFEON;
+ else {
+ if (avctx->channels < (ctx->nfchans + ctx->lfeon))
+ av_log(avctx, AV_LOG_INFO, "ac3_decoder: AC3 Source Channels Are Less Then Specified %d: Output to %d Channels\n",avctx->channels, ctx->nfchans + ctx->lfeon);
+ ctx->blkoutput |= AC3_OUTPUT_UNMODIFIED;
+ if (ctx->lfeon)
+ ctx->blkoutput |= AC3_OUTPUT_LFEON;
+ avctx->channels = ctx->nfchans + ctx->lfeon;
}
av_log(avctx, AV_LOG_INFO, "channels = %d \t bit rate = %d \t sampling rate = %d \n", avctx->channels, avctx->bit_rate * 1000, avctx->sample_rate);
@@ -2009,10 +1978,9 @@ static int ac3_decode_frame(AVCodecContext * avctx, void *data, int *data_size,
*data_size = 0;
return ctx->frame_size;
}
- j = ((ctx->blkoutput & AC3_OUTPUT_LFEON) ? 0 : 1);
for (k = 0; k < BLOCK_SIZE; k++) {
- j = ((ctx->blkoutput & AC3_OUTPUT_LFEON) ? 0 : 1);
- for (;j < avctx->channels + 1; j++) {
+ j = (ctx->blkoutput & AC3_OUTPUT_LFEON) ? 0 : 1;
+ for (; j <= avctx->channels; j++) {
value = convert(ctx->output[j][k]);
*(out_samples++) = value;
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-30 18:30:41 +0000