*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file mpegaudiodec.c
* MPEG Audio decoder.
- */
+ */
//#define DEBUG
#include "avcodec.h"
#include "bitstream.h"
-#include "mpegaudio.h"
#include "dsputil.h"
/*
#define USE_HIGHPRECISION
#endif
-#ifdef USE_HIGHPRECISION
-#define FRAC_BITS 23 /* fractional bits for sb_samples and dct */
-#define WFRAC_BITS 16 /* fractional bits for window */
-#else
-#define FRAC_BITS 15 /* fractional bits for sb_samples and dct */
-#define WFRAC_BITS 14 /* fractional bits for window */
-#endif
-
-#if defined(USE_HIGHPRECISION) && defined(CONFIG_AUDIO_NONSHORT)
-typedef int32_t OUT_INT;
-#define OUT_MAX INT32_MAX
-#define OUT_MIN INT32_MIN
-#define OUT_SHIFT (WFRAC_BITS + FRAC_BITS - 31)
-#else
-typedef int16_t OUT_INT;
-#define OUT_MAX INT16_MAX
-#define OUT_MIN INT16_MIN
-#define OUT_SHIFT (WFRAC_BITS + FRAC_BITS - 15)
-#endif
+#include "mpegaudio.h"
#define FRAC_ONE (1 << FRAC_BITS)
return ((int64_t)(a) * (int64_t)(b))>>32;
}
-#if FRAC_BITS <= 15
-typedef int16_t MPA_INT;
-#else
-typedef int32_t MPA_INT;
-#endif
-
/****************/
#define HEADER_SIZE 4
struct GranuleDef;
typedef struct MPADecodeContext {
- uint8_t inbuf1[2][MPA_MAX_CODED_FRAME_SIZE + BACKSTEP_SIZE]; /* input buffer */
+ uint8_t inbuf1[2][MPA_MAX_CODED_FRAME_SIZE + BACKSTEP_SIZE]; /* input buffer */
int inbuf_index;
uint8_t *inbuf_ptr, *inbuf;
int frame_size;
int free_format_frame_size; /* frame size in case of free format
(zero if currently unknown) */
/* next header (used in free format parsing) */
- uint32_t free_format_next_header;
+ uint32_t free_format_next_header;
int error_protection;
int layer;
int sample_rate;
unsigned int dither_state;
} MPADecodeContext;
+/**
+ * Context for MP3On4 decoder
+ */
+typedef struct MP3On4DecodeContext {
+ int frames; ///< number of mp3 frames per block (number of mp3 decoder instances)
+ int chan_cfg; ///< channel config number
+ MPADecodeContext *mp3decctx[5]; ///< MPADecodeContext for every decoder instance
+} MP3On4DecodeContext;
+
/* layer 3 "granule" */
typedef struct GranuleDef {
uint8_t scfsi;
static void compute_antialias_float(MPADecodeContext *s, GranuleDef *g);
/* vlc structure for decoding layer 3 huffman tables */
-static VLC huff_vlc[16];
+static VLC huff_vlc[16];
static uint8_t *huff_code_table[16];
static VLC huff_quad_vlc[2];
/* computed from band_size_long */
#define SCALE_GEN(v) \
{ FIXR(1.0 * (v)), FIXR(0.7937005259 * (v)), FIXR(0.6299605249 * (v)) }
-static int32_t scale_factor_mult2[3][3] = {
+static const int32_t scale_factor_mult2[3][3] = {
SCALE_GEN(4.0 / 3.0), /* 3 steps */
SCALE_GEN(4.0 / 5.0), /* 5 steps */
SCALE_GEN(4.0 / 9.0), /* 9 steps */
void ff_mpa_synth_init(MPA_INT *window);
static MPA_INT window[512] __attribute__((aligned(16)));
-
+
/* layer 1 unscaling */
/* n = number of bits of the mantissa minus 1 */
static inline int l1_unscale(int n, int mant, int scale_factor)
static int dev_4_3_coefs[DEV_ORDER];
+#if 0 /* unused */
static int pow_mult3[3] = {
POW_FIX(1.0),
POW_FIX(1.25992104989487316476),
POW_FIX(1.58740105196819947474),
};
+#endif
static void int_pow_init(void)
{
}
}
+#if 0 /* unused, remove? */
/* return the mantissa and the binary exponent */
static int int_pow(int i, int *exp_ptr)
{
int e, er, eq, j;
int a, a1;
-
+
/* renormalize */
a = i;
e = POW_FRAC_BITS;
*exp_ptr = eq;
return a;
}
+#endif
static int decode_init(AVCodecContext * avctx)
{
avctx->sample_fmt= SAMPLE_FMT_S32;
#else
avctx->sample_fmt= SAMPLE_FMT_S16;
-#endif
-
+#endif
+
if(avctx->antialias_algo != FF_AA_FLOAT)
s->compute_antialias= compute_antialias_integer;
else
scale_factor_mult[i][1] = MULL(FIXR(0.7937005259 * 2.0), norm);
scale_factor_mult[i][2] = MULL(FIXR(0.6299605249 * 2.0), norm);
dprintf("%d: norm=%x s=%x %x %x\n",
- i, norm,
+ i, norm,
scale_factor_mult[i][0],
scale_factor_mult[i][1],
scale_factor_mult[i][2]);
}
-
- ff_mpa_synth_init(window);
-
+
+ ff_mpa_synth_init(window);
+
/* huffman decode tables */
huff_code_table[0] = NULL;
for(i=1;i<16;i++) {
const HuffTable *h = &mpa_huff_tables[i];
- int xsize, x, y;
+ int xsize, x, y;
unsigned int n;
uint8_t *code_table;
xsize = h->xsize;
n = xsize * xsize;
/* XXX: fail test */
- init_vlc(&huff_vlc[i], 8, n,
+ init_vlc(&huff_vlc[i], 8, n,
h->bits, 1, 1, h->codes, 2, 2, 1);
-
+
code_table = av_mallocz(n);
j = 0;
for(x=0;x<xsize;x++) {
huff_code_table[i] = code_table;
}
for(i=0;i<2;i++) {
- init_vlc(&huff_quad_vlc[i], i == 0 ? 7 : 4, 16,
+ init_vlc(&huff_quad_vlc[i], i == 0 ? 7 : 4, 16,
mpa_quad_bits[i], 1, 1, mpa_quad_codes[i], 1, 1, 1);
}
band_index_long[i][22] = k;
}
- /* compute n ^ (4/3) and store it in mantissa/exp format */
- table_4_3_exp= av_mallocz_static(TABLE_4_3_SIZE * sizeof(table_4_3_exp[0]));
+ /* compute n ^ (4/3) and store it in mantissa/exp format */
+ table_4_3_exp= av_mallocz_static(TABLE_4_3_SIZE * sizeof(table_4_3_exp[0]));
if(!table_4_3_exp)
- return -1;
- table_4_3_value= av_mallocz_static(TABLE_4_3_SIZE * sizeof(table_4_3_value[0]));
+ return -1;
+ table_4_3_value= av_mallocz_static(TABLE_4_3_SIZE * sizeof(table_4_3_value[0]));
if(!table_4_3_value)
return -1;
-
+
int_pow_init();
for(i=1;i<TABLE_4_3_SIZE;i++) {
double f, fm;
int e, m;
f = pow((double)(i/4), 4.0 / 3.0) * pow(2, (i&3)*0.25);
fm = frexp(f, &e);
- m = FIXHR(fm*0.5);
- e+= FRAC_BITS - 31;
+ m = (uint32_t)(fm*(1LL<<31) + 0.5);
+ e+= FRAC_BITS - 31 + 5;
/* normalized to FRAC_BITS */
table_4_3_value[i] = m;
// av_log(NULL, AV_LOG_DEBUG, "%d %d %f\n", i, m, pow((double)i, 4.0 / 3.0));
table_4_3_exp[i] = -e;
}
-
+
for(i=0;i<7;i++) {
float f;
int v;
k = i & 1;
is_table_lsf[j][k ^ 1][i] = FIXR(f);
is_table_lsf[j][k][i] = FIXR(1.0);
- dprintf("is_table_lsf %d %d: %x %x\n",
+ dprintf("is_table_lsf %d %d: %x %x\n",
i, j, is_table_lsf[j][0][i], is_table_lsf[j][1][i]);
}
}
csa_table[i][0] = FIXHR(cs/4);
csa_table[i][1] = FIXHR(ca/4);
csa_table[i][2] = FIXHR(ca/4) + FIXHR(cs/4);
- csa_table[i][3] = FIXHR(ca/4) - FIXHR(cs/4);
+ csa_table[i][3] = FIXHR(ca/4) - FIXHR(cs/4);
csa_table_float[i][0] = cs;
csa_table_float[i][1] = ca;
csa_table_float[i][2] = ca + cs;
- csa_table_float[i][3] = ca - cs;
+ csa_table_float[i][3] = ca - cs;
// printf("%d %d %d %d\n", FIX(cs), FIX(cs-1), FIX(ca), FIX(cs)-FIX(ca));
// av_log(NULL, AV_LOG_DEBUG,"%f %f %f %f\n", cs, ca, ca+cs, ca-cs);
}
for(i=0;i<36;i++) {
for(j=0; j<4; j++){
double d;
- if(j==2) continue;
-
+
+ if(j==2 && i%3 != 1)
+ continue;
+
d= sin(M_PI * (i + 0.5) / 36.0);
if(j==1){
if (i>=30) d= 0;
else if(i< 18) d= 1;
}
//merge last stage of imdct into the window coefficients
- if (i/9 == 0) d*= 0.5 / cos(M_PI*(2*( i) +19)/72);
- else if(i/9 == 1) d*= 0.5 / cos(M_PI*(2*(17 - i) +19)/72);
- else if(i/9 == 2) d*= 0.5 / cos(M_PI*(2*( i) +19)/72);
- else d*=-0.5 / cos(M_PI*(2*(17 - i) +19)/72);
- mdct_win[j][i] = FIXHR((d / (1<<5)));
+ d*= 0.5 / cos(M_PI*(2*i + 19)/72);
+
+ if(j==2)
+ mdct_win[j][i/3] = FIXHR((d / (1<<5)));
+ else
+ mdct_win[j][i ] = FIXHR((d / (1<<5)));
// av_log(NULL, AV_LOG_DEBUG, "%2d %d %f\n", i,j,d / (1<<5));
}
}
- for(i=0;i<12;i++)
- mdct_win[2][i] = FIXR(sin(M_PI * (i + 0.5) / 12.0));
-
/* NOTE: we do frequency inversion adter the MDCT by changing
the sign of the right window coefs */
for(j=0;j<4;j++) {
BF(5, 10, COS1_5);
BF(6, 9, COS1_6);
BF(7, 8, COS1_7);
-
+
BF(16, 31, -COS1_0);
BF(17, 30, -COS1_1);
BF(18, 29, -COS1_2);
BF(21, 26, -COS1_5);
BF(22, 25, -COS1_6);
BF(23, 24, -COS1_7);
-
+
/* pass 3 */
BF(0, 7, COS2_0);
BF(1, 6, COS2_1);
BF(2, 5, COS2_2);
BF(3, 4, COS2_3);
-
+
BF(8, 15, -COS2_0);
BF(9, 14, -COS2_1);
BF(10, 13, -COS2_2);
BF(11, 12, -COS2_3);
-
+
BF(16, 23, COS2_0);
BF(17, 22, COS2_1);
BF(18, 21, COS2_2);
BF(19, 20, COS2_3);
-
+
BF(24, 31, -COS2_0);
BF(25, 30, -COS2_1);
BF(26, 29, -COS2_2);
/* pass 4 */
BF(0, 3, COS3_0);
BF(1, 2, COS3_1);
-
+
BF(4, 7, -COS3_0);
BF(5, 6, -COS3_1);
-
+
BF(8, 11, COS3_0);
BF(9, 10, COS3_1);
-
+
BF(12, 15, -COS3_0);
BF(13, 14, -COS3_1);
-
+
BF(16, 19, COS3_0);
BF(17, 18, COS3_1);
-
+
BF(20, 23, -COS3_0);
BF(21, 22, -COS3_1);
-
+
BF(24, 27, COS3_0);
BF(25, 26, COS3_1);
-
+
BF(28, 31, -COS3_0);
BF(29, 30, -COS3_1);
-
+
/* pass 5 */
BF1(0, 1, 2, 3);
BF2(4, 5, 6, 7);
BF2(20, 21, 22, 23);
BF1(24, 25, 26, 27);
BF2(28, 29, 30, 31);
-
+
/* pass 6 */
-
+
ADD( 8, 12);
ADD(12, 10);
ADD(10, 14);
out[22] = tab[13];
out[14] = tab[14];
out[30] = tab[15];
-
+
ADD(24, 28);
ADD(28, 26);
ADD(26, 30);
#else
-static inline int round_sample(int64_t *sum)
+static inline int round_sample(int64_t *sum)
{
int sum1;
sum1 = (int)((*sum) >> OUT_SHIFT);
v = -v;
if (i != 0)
window[512 - i] = v;
- }
+ }
}
/* 32 sub band synthesis filter. Input: 32 sub band samples, Output:
32 samples. */
/* XXX: optimize by avoiding ring buffer usage */
void ff_mpa_synth_filter(MPA_INT *synth_buf_ptr, int *synth_buf_offset,
- MPA_INT *window, int *dither_state,
- OUT_INT *samples, int incr,
+ MPA_INT *window, int *dither_state,
+ OUT_INT *samples, int incr,
int32_t sb_samples[SBLIMIT])
{
int32_t tmp[32];
#endif
dct32(tmp, sb_samples);
-
+
offset = *synth_buf_offset;
synth_buf = synth_buf_ptr + offset;
w++;
w2--;
}
-
+
p = synth_buf + 32;
SUM8(sum, -=, w + 32, p);
*samples = round_sample(&sum);
*synth_buf_offset = offset;
}
-/* cos(pi*i/24) */
-#define C1 FIXR(0.99144486137381041114)
-#define C3 FIXR(0.92387953251128675612)
-#define C5 FIXR(0.79335334029123516458)
-#define C7 FIXR(0.60876142900872063941)
-#define C9 FIXR(0.38268343236508977173)
-#define C11 FIXR(0.13052619222005159154)
+#define C3 FIXHR(0.86602540378443864676/2)
+
+/* 0.5 / cos(pi*(2*i+1)/36) */
+static const int icos36[9] = {
+ FIXR(0.50190991877167369479),
+ FIXR(0.51763809020504152469), //0
+ FIXR(0.55168895948124587824),
+ FIXR(0.61038729438072803416),
+ FIXR(0.70710678118654752439), //1
+ FIXR(0.87172339781054900991),
+ FIXR(1.18310079157624925896),
+ FIXR(1.93185165257813657349), //2
+ FIXR(5.73685662283492756461),
+};
/* 12 points IMDCT. We compute it "by hand" by factorizing obvious
cases. */
static void imdct12(int *out, int *in)
{
- int tmp;
- int64_t in1_3, in1_9, in4_3, in4_9;
-
- in1_3 = MUL64(in[1], C3);
- in1_9 = MUL64(in[1], C9);
- in4_3 = MUL64(in[4], C3);
- in4_9 = MUL64(in[4], C9);
-
- tmp = FRAC_RND(MUL64(in[0], C7) - in1_3 - MUL64(in[2], C11) +
- MUL64(in[3], C1) - in4_9 - MUL64(in[5], C5));
- out[0] = tmp;
- out[5] = -tmp;
- tmp = FRAC_RND(MUL64(in[0] - in[3], C9) - in1_3 +
- MUL64(in[2] + in[5], C3) - in4_9);
- out[1] = tmp;
- out[4] = -tmp;
- tmp = FRAC_RND(MUL64(in[0], C11) - in1_9 + MUL64(in[2], C7) -
- MUL64(in[3], C5) + in4_3 - MUL64(in[5], C1));
- out[2] = tmp;
- out[3] = -tmp;
- tmp = FRAC_RND(MUL64(-in[0], C5) + in1_9 + MUL64(in[2], C1) +
- MUL64(in[3], C11) - in4_3 - MUL64(in[5], C7));
- out[6] = tmp;
- out[11] = tmp;
- tmp = FRAC_RND(MUL64(-in[0] + in[3], C3) - in1_9 +
- MUL64(in[2] + in[5], C9) + in4_3);
- out[7] = tmp;
- out[10] = tmp;
- tmp = FRAC_RND(-MUL64(in[0], C1) - in1_3 - MUL64(in[2], C5) -
- MUL64(in[3], C7) - in4_9 - MUL64(in[5], C11));
- out[8] = tmp;
- out[9] = tmp;
+ int in0, in1, in2, in3, in4, in5, t1, t2;
+
+ in0= in[0*3];
+ in1= in[1*3] + in[0*3];
+ in2= in[2*3] + in[1*3];
+ in3= in[3*3] + in[2*3];
+ in4= in[4*3] + in[3*3];
+ in5= in[5*3] + in[4*3];
+ in5 += in3;
+ in3 += in1;
+
+ in2= MULH(2*in2, C3);
+ in3= MULH(2*in3, C3);
+
+ t1 = in0 - in4;
+ t2 = MULL(in1 - in5, icos36[4]);
+
+ out[ 7]=
+ out[10]= t1 + t2;
+ out[ 1]=
+ out[ 4]= t1 - t2;
+
+ in0 += in4>>1;
+ in4 = in0 + in2;
+ in1 += in5>>1;
+ in5 = MULL(in1 + in3, icos36[1]);
+ out[ 8]=
+ out[ 9]= in4 + in5;
+ out[ 2]=
+ out[ 3]= in4 - in5;
+
+ in0 -= in2;
+ in1 = MULL(in1 - in3, icos36[7]);
+ out[ 0]=
+ out[ 5]= in0 - in1;
+ out[ 6]=
+ out[11]= in0 + in1;
}
-#undef C1
-#undef C3
-#undef C5
-#undef C7
-#undef C9
-#undef C11
-
/* cos(pi*i/18) */
#define C1 FIXHR(0.98480775301220805936/2)
#define C2 FIXHR(0.93969262078590838405/2)
#define C8 FIXHR(0.17364817766693034885/2)
-/* 0.5 / cos(pi*(2*i+1)/36) */
-static const int icos36[9] = {
- FIXR(0.50190991877167369479),
- FIXR(0.51763809020504152469),
- FIXR(0.55168895948124587824),
- FIXR(0.61038729438072803416),
- FIXR(0.70710678118654752439),
- FIXR(0.87172339781054900991),
- FIXR(1.18310079157624925896),
- FIXR(1.93185165257813657349),
- FIXR(5.73685662283492756461),
-};
/* using Lee like decomposition followed by hand coded 9 points DCT */
static void imdct36(int *out, int *buf, int *in, int *win)
{
//more accurate but slower
int64_t t0, t1, t2, t3;
t2 = in1[2*4] + in1[2*8] - in1[2*2];
-
+
t3 = (in1[2*0] + (int64_t)(in1[2*6]>>1))<<32;
t1 = in1[2*0] - in1[2*6];
tmp1[ 6] = t1 - (t2>>1);
t0 = MUL64(2*(in1[2*2] + in1[2*4]), C2);
t1 = MUL64( in1[2*4] - in1[2*8] , -2*C8);
t2 = MUL64(2*(in1[2*2] + in1[2*8]), -C4);
-
+
tmp1[10] = (t3 - t0 - t2) >> 32;
tmp1[ 2] = (t3 + t0 + t1) >> 32;
tmp1[14] = (t3 + t2 - t1) >> 32;
-
+
tmp1[ 4] = MULH(2*(in1[2*5] + in1[2*7] - in1[2*1]), -C3);
t2 = MUL64(2*(in1[2*1] + in1[2*5]), C1);
t3 = MUL64( in1[2*5] - in1[2*7] , -2*C7);
tmp1[ 8] = (t3 - t1 - t0) >> 32;
#else
t2 = in1[2*4] + in1[2*8] - in1[2*2];
-
+
t3 = in1[2*0] + (in1[2*6]>>1);
t1 = in1[2*0] - in1[2*6];
tmp1[ 6] = t1 - (t2>>1);
t0 = MULH(2*(in1[2*2] + in1[2*4]), C2);
t1 = MULH( in1[2*4] - in1[2*8] , -2*C8);
t2 = MULH(2*(in1[2*2] + in1[2*8]), -C4);
-
+
tmp1[10] = t3 - t0 - t2;
tmp1[ 2] = t3 + t0 + t1;
tmp1[14] = t3 + t2 - t1;
-
+
tmp1[ 4] = MULH(2*(in1[2*5] + in1[2*7] - in1[2*1]), -C3);
t2 = MULH(2*(in1[2*1] + in1[2*5]), C1);
t3 = MULH( in1[2*5] - in1[2*7] , -2*C7);
t3 = tmp[i + 3];
s1 = MULL(t3 + t2, icos36[j]);
s3 = MULL(t3 - t2, icos36[8 - j]);
-
- t0 = (s0 + s1) << 5;
- t1 = (s0 - s1) << 5;
- out[(9 + j)*SBLIMIT] = -MULH(t1, win[9 + j]) + buf[9 + j];
+
+ t0 = s0 + s1;
+ t1 = s0 - s1;
+ out[(9 + j)*SBLIMIT] = MULH(t1, win[9 + j]) + buf[9 + j];
out[(8 - j)*SBLIMIT] = MULH(t1, win[8 - j]) + buf[8 - j];
buf[9 + j] = MULH(t0, win[18 + 9 + j]);
buf[8 - j] = MULH(t0, win[18 + 8 - j]);
-
- t0 = (s2 + s3) << 5;
- t1 = (s2 - s3) << 5;
- out[(9 + 8 - j)*SBLIMIT] = -MULH(t1, win[9 + 8 - j]) + buf[9 + 8 - j];
+
+ t0 = s2 + s3;
+ t1 = s2 - s3;
+ out[(9 + 8 - j)*SBLIMIT] = MULH(t1, win[9 + 8 - j]) + buf[9 + 8 - j];
out[( j)*SBLIMIT] = MULH(t1, win[ j]) + buf[ j];
buf[9 + 8 - j] = MULH(t0, win[18 + 9 + 8 - j]);
buf[ + j] = MULH(t0, win[18 + j]);
s0 = tmp[16];
s1 = MULL(tmp[17], icos36[4]);
- t0 = (s0 + s1) << 5;
- t1 = (s0 - s1) << 5;
- out[(9 + 4)*SBLIMIT] = -MULH(t1, win[9 + 4]) + buf[9 + 4];
+ t0 = s0 + s1;
+ t1 = s0 - s1;
+ out[(9 + 4)*SBLIMIT] = MULH(t1, win[9 + 4]) + buf[9 + 4];
out[(8 - 4)*SBLIMIT] = MULH(t1, win[8 - 4]) + buf[8 - 4];
buf[9 + 4] = MULH(t0, win[18 + 9 + 4]);
buf[8 - 4] = MULH(t0, win[18 + 8 - 4]);
s->lsf = 1;
mpeg25 = 1;
}
-
+
s->layer = 4 - ((header >> 17) & 3);
/* extract frequency */
sample_rate_index = (header >> 10) & 3;
s->nb_channels = 1;
else
s->nb_channels = 2;
-
+
if (bitrate_index != 0) {
frame_size = mpa_bitrate_tab[s->lsf][s->layer - 1][bitrate_index];
s->bit_rate = frame_size * 1000;
break;
}
}
-
+
#if defined(DEBUG)
printf("layer%d, %d Hz, %d kbits/s, ",
s->layer, s->sample_rate, s->bit_rate);
uint8_t allocation[MPA_MAX_CHANNELS][SBLIMIT];
uint8_t scale_factors[MPA_MAX_CHANNELS][SBLIMIT];
- if (s->mode == MPA_JSTEREO)
+ if (s->mode == MPA_JSTEREO)
bound = (s->mode_ext + 1) * 4;
else
bound = SBLIMIT;
scale_factors[1][i] = get_bits(&s->gb, 6);
}
}
-
+
/* compute samples */
for(j=0;j<12;j++) {
for(i=0;i<bound;i++) {
int l2_select_table(int bitrate, int nb_channels, int freq, int lsf)
{
int ch_bitrate, table;
-
+
ch_bitrate = bitrate / nb_channels;
if (!lsf) {
if ((freq == 48000 && ch_bitrate >= 56) ||
- (ch_bitrate >= 56 && ch_bitrate <= 80))
+ (ch_bitrate >= 56 && ch_bitrate <= 80))
table = 0;
- else if (freq != 48000 && ch_bitrate >= 96)
+ else if (freq != 48000 && ch_bitrate >= 96)
table = 1;
- else if (freq != 32000 && ch_bitrate <= 48)
+ else if (freq != 32000 && ch_bitrate <= 48)
table = 2;
- else
+ else
table = 3;
} else {
table = 4;
int scale, qindex, bits, steps, k, l, m, b;
/* select decoding table */
- table = l2_select_table(s->bit_rate / 1000, s->nb_channels,
+ table = l2_select_table(s->bit_rate / 1000, s->nb_channels,
s->sample_rate, s->lsf);
sblimit = sblimit_table[table];
alloc_table = alloc_tables[table];
- if (s->mode == MPA_JSTEREO)
+ if (s->mode == MPA_JSTEREO)
bound = (s->mode_ext + 1) * 4;
else
bound = sblimit;
/* scale codes */
for(i=0;i<sblimit;i++) {
for(ch=0;ch<s->nb_channels;ch++) {
- if (bit_alloc[ch][i])
+ if (bit_alloc[ch][i])
scale_code[ch][i] = get_bits(&s->gb, 2);
}
}
-
+
/* scale factors */
for(i=0;i<sblimit;i++) {
for(ch=0;ch<s->nb_channels;ch++) {
/* 3 values at the same time */
v = get_bits(&s->gb, -bits);
steps = quant_steps[qindex];
- s->sb_samples[ch][k * 12 + l + 0][i] =
+ s->sb_samples[ch][k * 12 + l + 0][i] =
l2_unscale_group(steps, v % steps, scale);
v = v / steps;
- s->sb_samples[ch][k * 12 + l + 1][i] =
+ s->sb_samples[ch][k * 12 + l + 1][i] =
l2_unscale_group(steps, v % steps, scale);
v = v / steps;
- s->sb_samples[ch][k * 12 + l + 2][i] =
+ s->sb_samples[ch][k * 12 + l + 2][i] =
l2_unscale_group(steps, v, scale);
} else {
for(m=0;m<3;m++) {
}
}
/* next subband in alloc table */
- j += 1 << bit_alloc_bits;
+ j += 1 << bit_alloc_bits;
}
/* XXX: find a way to avoid this duplication of code */
for(i=bound;i<sblimit;i++) {
steps = quant_steps[qindex];
mant = v % steps;
v = v / steps;
- s->sb_samples[0][k * 12 + l + 0][i] =
+ s->sb_samples[0][k * 12 + l + 0][i] =
l2_unscale_group(steps, mant, scale0);
- s->sb_samples[1][k * 12 + l + 0][i] =
+ s->sb_samples[1][k * 12 + l + 0][i] =
l2_unscale_group(steps, mant, scale1);
mant = v % steps;
v = v / steps;
- s->sb_samples[0][k * 12 + l + 1][i] =
+ s->sb_samples[0][k * 12 + l + 1][i] =
l2_unscale_group(steps, mant, scale0);
- s->sb_samples[1][k * 12 + l + 1][i] =
+ s->sb_samples[1][k * 12 + l + 1][i] =
l2_unscale_group(steps, mant, scale1);
- s->sb_samples[0][k * 12 + l + 2][i] =
+ s->sb_samples[0][k * 12 + l + 2][i] =
l2_unscale_group(steps, v, scale0);
- s->sb_samples[1][k * 12 + l + 2][i] =
+ s->sb_samples[1][k * 12 + l + 2][i] =
l2_unscale_group(steps, v, scale1);
} else {
for(m=0;m<3;m++) {
mant = get_bits(&s->gb, bits);
- s->sb_samples[0][k * 12 + l + m][i] =
+ s->sb_samples[0][k * 12 + l + m][i] =
l1_unscale(bits - 1, mant, scale0);
- s->sb_samples[1][k * 12 + l + m][i] =
+ s->sb_samples[1][k * 12 + l + m][i] =
l1_unscale(bits - 1, mant, scale1);
}
}
s->sb_samples[1][k * 12 + l + 2][i] = 0;
}
/* next subband in alloc table */
- j += 1 << bit_alloc_bits;
+ j += 1 << bit_alloc_bits;
}
/* fill remaining samples to zero */
for(i=sblimit;i<SBLIMIT;i++) {
/* copy old data before current one */
ptr -= backstep;
- memcpy(ptr, s->inbuf1[s->inbuf_index ^ 1] +
+ memcpy(ptr, s->inbuf1[s->inbuf_index ^ 1] +
BACKSTEP_SIZE + s->old_frame_size - backstep, backstep);
/* init get bits again */
init_get_bits(&s->gb, ptr, (s->frame_size + backstep)*8);
slen[0] = sf;
}
-static void exponents_from_scale_factors(MPADecodeContext *s,
+static void exponents_from_scale_factors(MPADecodeContext *s,
GranuleDef *g,
int16_t *exponents)
{
if (get_bits_count(&s->gb) >= end_pos)
break;
if (code_table) {
- code = get_vlc(&s->gb, vlc);
+ code = get_vlc2(&s->gb, vlc->table, 8, 2);
if (code < 0)
return -1;
y = code_table[code];
x = 0;
y = 0;
}
- dprintf("region=%d n=%d x=%d y=%d exp=%d\n",
+ dprintf("region=%d n=%d x=%d y=%d exp=%d\n",
i, g->region_size[i] - j, x, y, exponents[s_index]);
if (x) {
if (x == 15)
g->sb_hybrid[s_index++] = v;
}
}
-
+
/* high frequencies */
vlc = &huff_quad_vlc[g->count1table_select];
last_gb.buffer = NULL;
}
last_gb= s->gb;
- code = get_vlc(&s->gb, vlc);
+ code = get_vlc2(&s->gb, vlc->table, vlc->bits, 2);
dprintf("t=%d code=%d\n", g->count1table_select, code);
if (code < 0)
return -1;
} else {
ptr = g->sb_hybrid;
}
-
+
for(i=g->short_start;i<13;i++) {
len = band_size_short[s->sample_rate_index][i];
ptr1 = ptr;
is_tab = is_table_lsf[g1->scalefac_compress & 1];
sf_max = 16;
}
-
+
tab0 = g0->sb_hybrid + 576;
tab1 = g1->sb_hybrid + 576;
}
}
- non_zero_found = non_zero_found_short[0] |
- non_zero_found_short[1] |
+ non_zero_found = non_zero_found_short[0] |
+ non_zero_found_short[1] |
non_zero_found_short[2];
for(i = g1->long_end - 1;i >= 0;i--) {
} else {
n = SBLIMIT - 1;
}
-
+
ptr = g->sb_hybrid + 18;
for(i = n;i > 0;i--) {
int tmp0, tmp1, tmp2;
csa = &csa_table[0][0];
#define INT_AA(j) \
- tmp0 = 4*(ptr[-1-j]);\
- tmp1 = 4*(ptr[ j]);\
+ tmp0 = ptr[-1-j];\
+ tmp1 = ptr[ j];\
tmp2= MULH(tmp0 + tmp1, csa[0+4*j]);\
- ptr[-1-j] = tmp2 - MULH(tmp1, csa[2+4*j]);\
- ptr[ j] = tmp2 + MULH(tmp0, csa[3+4*j]);
+ ptr[-1-j] = 4*(tmp2 - MULH(tmp1, csa[2+4*j]));\
+ ptr[ j] = 4*(tmp2 + MULH(tmp0, csa[3+4*j]));
INT_AA(0)
INT_AA(1)
INT_AA(5)
INT_AA(6)
INT_AA(7)
-
- ptr += 18;
+
+ ptr += 18;
}
}
} else {
n = SBLIMIT - 1;
}
-
+
ptr = g->sb_hybrid + 18;
for(i = n;i > 0;i--) {
float tmp0, tmp1;
- float *csa = &csa_table_float[0][0];
+ float *csa = &csa_table_float[0][0];
#define FLOAT_AA(j)\
tmp0= ptr[-1-j];\
tmp1= ptr[ j];\
ptr[-1-j] = lrintf(tmp0 * csa[0+4*j] - tmp1 * csa[1+4*j]);\
ptr[ j] = lrintf(tmp0 * csa[1+4*j] + tmp1 * csa[0+4*j]);
-
+
FLOAT_AA(0)
FLOAT_AA(1)
FLOAT_AA(2)
FLOAT_AA(6)
FLOAT_AA(7)
- ptr += 18;
+ ptr += 18;
}
}
static void compute_imdct(MPADecodeContext *s,
- GranuleDef *g,
+ GranuleDef *g,
int32_t *sb_samples,
int32_t *mdct_buf)
{
- int32_t *ptr, *win, *win1, *buf, *buf2, *out_ptr, *ptr1;
- int32_t in[6];
- int32_t out[36];
+ int32_t *ptr, *win, *win1, *buf, *out_ptr, *ptr1;
int32_t out2[12];
- int i, j, k, mdct_long_end, v, sblimit;
+ int i, j, mdct_long_end, v, sblimit;
/* find last non zero block */
ptr = g->sb_hybrid + 576;
buf += 18;
}
for(j=mdct_long_end;j<sblimit;j++) {
- for(i=0;i<6;i++) {
- out[i] = 0;
- out[6 + i] = 0;
- out[30+i] = 0;
- }
/* select frequency inversion */
win = mdct_win[2] + ((4 * 36) & -(j & 1));
- buf2 = out + 6;
- for(k=0;k<3;k++) {
- /* reorder input for short mdct */
- ptr1 = ptr + k;
- for(i=0;i<6;i++) {
- in[i] = *ptr1;
- ptr1 += 3;
- }
- imdct12(out2, in);
- /* apply 12 point window and do small overlap */
- for(i=0;i<6;i++) {
- buf2[i] = MULL(out2[i], win[i]) + buf2[i];
- buf2[i + 6] = MULL(out2[i + 6], win[i + 6]);
- }
- buf2 += 6;
- }
- /* overlap */
out_ptr = sb_samples + j;
- for(i=0;i<18;i++) {
- *out_ptr = out[i] + buf[i];
- buf[i] = out[i + 18];
+
+ for(i=0; i<6; i++){
+ *out_ptr = buf[i];
+ out_ptr += SBLIMIT;
+ }
+ imdct12(out2, ptr + 0);
+ for(i=0;i<6;i++) {
+ *out_ptr = MULH(out2[i], win[i]) + buf[i + 6*1];
+ buf[i + 6*2] = MULH(out2[i + 6], win[i + 6]);
out_ptr += SBLIMIT;
}
+ imdct12(out2, ptr + 1);
+ for(i=0;i<6;i++) {
+ *out_ptr = MULH(out2[i], win[i]) + buf[i + 6*2];
+ buf[i + 6*0] = MULH(out2[i + 6], win[i + 6]);
+ out_ptr += SBLIMIT;
+ }
+ imdct12(out2, ptr + 2);
+ for(i=0;i<6;i++) {
+ buf[i + 6*0] = MULH(out2[i], win[i]) + buf[i + 6*0];
+ buf[i + 6*1] = MULH(out2[i + 6], win[i + 6]);
+ buf[i + 6*2] = 0;
+ }
ptr += 18;
buf += 18;
}
char buf[512];
int i;
int32_t v;
-
+
f = files[fnum];
if (!f) {
- snprintf(buf, sizeof(buf), "/tmp/out%d.%s.pcm",
- fnum,
+ snprintf(buf, sizeof(buf), "/tmp/out%d.%s.pcm",
+ fnum,
#ifdef USE_HIGHPRECISION
"hp"
#else
return;
files[fnum] = f;
}
-
+
if (fnum == 0) {
static int pos = 0;
av_log(NULL, AV_LOG_DEBUG, "pos=%d\n", pos);
granules[ch][1].scfsi = get_bits(&s->gb, 4);
}
}
-
+
for(gr=0;gr<nb_granules;gr++) {
for(ch=0;ch<s->nb_channels;ch++) {
dprintf("gr=%d ch=%d: side_info\n", gr, ch);
g->global_gain = get_bits(&s->gb, 8);
/* if MS stereo only is selected, we precompute the
1/sqrt(2) renormalization factor */
- if ((s->mode_ext & (MODE_EXT_MS_STEREO | MODE_EXT_I_STEREO)) ==
+ if ((s->mode_ext & (MODE_EXT_MS_STEREO | MODE_EXT_I_STEREO)) ==
MODE_EXT_MS_STEREO)
g->global_gain -= 2;
if (s->lsf)
g->switch_point = get_bits(&s->gb, 1);
for(i=0;i<2;i++)
g->table_select[i] = get_bits(&s->gb, 5);
- for(i=0;i<3;i++)
+ for(i=0;i<3;i++)
g->subblock_gain[i] = get_bits(&s->gb, 3);
/* compute huffman coded region sizes */
if (g->block_type == 2)
g->region_size[0] = (36 / 2);
else {
- if (s->sample_rate_index <= 2)
+ if (s->sample_rate_index <= 2)
g->region_size[0] = (36 / 2);
- else if (s->sample_rate_index != 8)
+ else if (s->sample_rate_index != 8)
g->region_size[0] = (54 / 2);
else
g->region_size[0] = (108 / 2);
/* compute huffman coded region sizes */
region_address1 = get_bits(&s->gb, 4);
region_address2 = get_bits(&s->gb, 3);
- dprintf("region1=%d region2=%d\n",
+ dprintf("region1=%d region2=%d\n",
region_address1, region_address2);
- g->region_size[0] =
+ g->region_size[0] =
band_index_long[s->sample_rate_index][region_address1 + 1] >> 1;
l = region_address1 + region_address2 + 2;
/* should not overflow */
if (l > 22)
l = 22;
- g->region_size[1] =
+ g->region_size[1] =
band_index_long[s->sample_rate_index][l] >> 1;
}
/* convert region offsets to region sizes and truncate
g->long_end = 6;
else
g->long_end = 4; /* 8000 Hz */
-
+
if (s->sample_rate_index != 8)
g->short_start = 3;
else
- g->short_start = 2;
+ g->short_start = 2;
} else {
g->long_end = 0;
g->short_start = 0;
g->short_start = 13;
g->long_end = 22;
}
-
+
g->preflag = 0;
if (!s->lsf)
g->preflag = get_bits(&s->gb, 1);
for(gr=0;gr<nb_granules;gr++) {
for(ch=0;ch<s->nb_channels;ch++) {
g = &granules[ch][gr];
-
+
bits_pos = get_bits_count(&s->gb);
-
+
if (!s->lsf) {
uint8_t *sc;
int slen, slen1, slen2;
}
#if defined(DEBUG)
{
- printf("scfsi=%x gr=%d ch=%d scale_factors:\n",
+ printf("scfsi=%x gr=%d ch=%d scale_factors:\n",
g->scfsi, gr, ch);
for(i=0;i<j;i++)
printf(" %d", g->scale_factors[i]);
g->scale_factors[j] = 0;
#if defined(DEBUG)
{
- printf("gr=%d ch=%d scale_factors:\n",
+ printf("gr=%d ch=%d scale_factors:\n",
gr, ch);
for(i=0;i<40;i++)
printf(" %d", g->scale_factors[i]);
#if defined(DEBUG)
sample_dump(1, g->sb_hybrid, 576);
#endif
- compute_imdct(s, g, &s->sb_samples[ch][18 * gr][0], s->mdct_buf[ch]);
+ compute_imdct(s, g, &s->sb_samples[ch][18 * gr][0], s->mdct_buf[ch]);
#if defined(DEBUG)
sample_dump(2, &s->sb_samples[ch][18 * gr][0], 576);
#endif
return nb_granules * 18;
}
-static int mp_decode_frame(MPADecodeContext *s,
+static int mp_decode_frame(MPADecodeContext *s,
OUT_INT *samples)
{
int i, nb_frames, ch;
OUT_INT *samples_ptr;
- init_get_bits(&s->gb, s->inbuf + HEADER_SIZE,
+ init_get_bits(&s->gb, s->inbuf + HEADER_SIZE,
(s->inbuf_ptr - s->inbuf - HEADER_SIZE)*8);
-
+
/* skip error protection field */
if (s->error_protection)
get_bits(&s->gb, 16);
samples_ptr = samples + ch;
for(i=0;i<nb_frames;i++) {
ff_mpa_synth_filter(s->synth_buf[ch], &(s->synth_buf_offset[ch]),
- window, &s->dither_state,
- samples_ptr, s->nb_channels,
+ window, &s->dither_state,
+ samples_ptr, s->nb_channels,
s->sb_samples[ch][i]);
samples_ptr += 32 * s->nb_channels;
}
}
#ifdef DEBUG
- s->frame_count++;
+ s->frame_count++;
#endif
return nb_frames * 32 * sizeof(OUT_INT) * s->nb_channels;
}
static int decode_frame(AVCodecContext * avctx,
- void *data, int *data_size,
- uint8_t * buf, int buf_size)
+ void *data, int *data_size,
+ uint8_t * buf, int buf_size)
{
MPADecodeContext *s = avctx->priv_data;
uint32_t header;
buf_ptr = buf;
while (buf_size > 0) {
- len = s->inbuf_ptr - s->inbuf;
- if (s->frame_size == 0) {
+ len = s->inbuf_ptr - s->inbuf;
+ if (s->frame_size == 0) {
/* special case for next header for first frame in free
format case (XXX: find a simpler method) */
if (s->free_format_next_header != 0) {
s->free_format_next_header = 0;
goto got_header;
}
- /* no header seen : find one. We need at least HEADER_SIZE
+ /* no header seen : find one. We need at least HEADER_SIZE
bytes to parse it */
- len = HEADER_SIZE - len;
- if (len > buf_size)
- len = buf_size;
- if (len > 0) {
- memcpy(s->inbuf_ptr, buf_ptr, len);
- buf_ptr += len;
- buf_size -= len;
- s->inbuf_ptr += len;
- }
- if ((s->inbuf_ptr - s->inbuf) >= HEADER_SIZE) {
+ len = HEADER_SIZE - len;
+ if (len > buf_size)
+ len = buf_size;
+ if (len > 0) {
+ memcpy(s->inbuf_ptr, buf_ptr, len);
+ buf_ptr += len;
+ buf_size -= len;
+ s->inbuf_ptr += len;
+ }
+ if ((s->inbuf_ptr - s->inbuf) >= HEADER_SIZE) {
got_header:
- header = (s->inbuf[0] << 24) | (s->inbuf[1] << 16) |
- (s->inbuf[2] << 8) | s->inbuf[3];
+ header = (s->inbuf[0] << 24) | (s->inbuf[1] << 16) |
+ (s->inbuf[2] << 8) | s->inbuf[3];
- if (ff_mpa_check_header(header) < 0) {
- /* no sync found : move by one byte (inefficient, but simple!) */
- memmove(s->inbuf, s->inbuf + 1, s->inbuf_ptr - s->inbuf - 1);
- s->inbuf_ptr--;
+ if (ff_mpa_check_header(header) < 0) {
+ /* no sync found : move by one byte (inefficient, but simple!) */
+ memmove(s->inbuf, s->inbuf + 1, s->inbuf_ptr - s->inbuf - 1);
+ s->inbuf_ptr--;
dprintf("skip %x\n", header);
/* reset free format frame size to give a chance
to get a new bitrate */
s->free_format_frame_size = 0;
- } else {
- if (decode_header(s, header) == 1) {
+ } else {
+ if (decode_header(s, header) == 1) {
/* free format: prepare to compute frame size */
- s->frame_size = -1;
+ s->frame_size = -1;
}
/* update codec info */
avctx->sample_rate = s->sample_rate;
avctx->frame_size = 1152;
break;
}
- }
- }
+ }
+ }
} else if (s->frame_size == -1) {
/* free format : find next sync to compute frame size */
- len = MPA_MAX_CODED_FRAME_SIZE - len;
- if (len > buf_size)
- len = buf_size;
+ len = MPA_MAX_CODED_FRAME_SIZE - len;
+ if (len > buf_size)
+ len = buf_size;
if (len == 0) {
- /* frame too long: resync */
+ /* frame too long: resync */
s->frame_size = 0;
- memmove(s->inbuf, s->inbuf + 1, s->inbuf_ptr - s->inbuf - 1);
- s->inbuf_ptr--;
+ memmove(s->inbuf, s->inbuf + 1, s->inbuf_ptr - s->inbuf - 1);
+ s->inbuf_ptr--;
} else {
uint8_t *p, *pend;
uint32_t header1;
s->free_format_frame_size -= padding * 4;
else
s->free_format_frame_size -= padding;
- dprintf("free frame size=%d padding=%d\n",
+ dprintf("free frame size=%d padding=%d\n",
s->free_format_frame_size, padding);
decode_header(s, header1);
goto next_data;
s->inbuf_ptr += len;
buf_size -= len;
}
- } else if (len < s->frame_size) {
+ } else if (len < s->frame_size) {
if (s->frame_size > MPA_MAX_CODED_FRAME_SIZE)
s->frame_size = MPA_MAX_CODED_FRAME_SIZE;
- len = s->frame_size - len;
- if (len > buf_size)
- len = buf_size;
- memcpy(s->inbuf_ptr, buf_ptr, len);
- buf_ptr += len;
- s->inbuf_ptr += len;
- buf_size -= len;
- }
+ len = s->frame_size - len;
+ if (len > buf_size)
+ len = buf_size;
+ memcpy(s->inbuf_ptr, buf_ptr, len);
+ buf_ptr += len;
+ s->inbuf_ptr += len;
+ buf_size -= len;
+ }
next_data:
- if (s->frame_size > 0 &&
+ if (s->frame_size > 0 &&
(s->inbuf_ptr - s->inbuf) >= s->frame_size) {
if (avctx->parse_only) {
/* simply return the frame data */
} else {
out_size = mp_decode_frame(s, out_samples);
}
- s->inbuf_ptr = s->inbuf;
- s->frame_size = 0;
- *data_size = out_size;
- break;
- }
+ s->inbuf_ptr = s->inbuf;
+ s->frame_size = 0;
+ if(out_size>=0)
+ *data_size = out_size;
+ else
+ av_log(avctx, AV_LOG_DEBUG, "Error while decoding mpeg audio frame\n"); //FIXME return -1 / but also return the number of bytes consumed
+ break;
+ }
}
return buf_ptr - buf;
}
static int decode_frame_adu(AVCodecContext * avctx,
- void *data, int *data_size,
- uint8_t * buf, int buf_size)
+ void *data, int *data_size,
+ uint8_t * buf, int buf_size)
{
MPADecodeContext *s = avctx->priv_data;
uint32_t header;
}
+/* Next 3 arrays are indexed by channel config number (passed via codecdata) */
+static int mp3Frames[16] = {0,1,1,2,3,3,4,5,2}; /* number of mp3 decoder instances */
+static int mp3Channels[16] = {0,1,2,3,4,5,6,8,4}; /* total output channels */
+/* offsets into output buffer, assume output order is FL FR BL BR C LFE */
+static int chan_offset[9][5] = {
+ {0},
+ {0}, // C
+ {0}, // FLR
+ {2,0}, // C FLR
+ {2,0,3}, // C FLR BS
+ {4,0,2}, // C FLR BLRS
+ {4,0,2,5}, // C FLR BLRS LFE
+ {4,0,2,6,5}, // C FLR BLRS BLR LFE
+ {0,2} // FLR BLRS
+};
+
+
+static int decode_init_mp3on4(AVCodecContext * avctx)
+{
+ MP3On4DecodeContext *s = avctx->priv_data;
+ int i;
+
+ if ((avctx->extradata_size < 2) || (avctx->extradata == NULL)) {
+ av_log(avctx, AV_LOG_ERROR, "Codec extradata missing or too short.\n");
+ return -1;
+ }
+
+ s->chan_cfg = (((unsigned char *)avctx->extradata)[1] >> 3) & 0x0f;
+ s->frames = mp3Frames[s->chan_cfg];
+ if(!s->frames) {
+ av_log(avctx, AV_LOG_ERROR, "Invalid channel config number.\n");
+ return -1;
+ }
+ avctx->channels = mp3Channels[s->chan_cfg];
+
+ /* Init the first mp3 decoder in standard way, so that all tables get builded
+ * We replace avctx->priv_data with the context of the first decoder so that
+ * decode_init() does not have to be changed.
+ * Other decoders will be inited here copying data from the first context
+ */
+ // Allocate zeroed memory for the first decoder context
+ s->mp3decctx[0] = av_mallocz(sizeof(MPADecodeContext));
+ // Put decoder context in place to make init_decode() happy
+ avctx->priv_data = s->mp3decctx[0];
+ decode_init(avctx);
+ // Restore mp3on4 context pointer
+ avctx->priv_data = s;
+ s->mp3decctx[0]->adu_mode = 1; // Set adu mode
+
+ /* Create a separate codec/context for each frame (first is already ok).
+ * Each frame is 1 or 2 channels - up to 5 frames allowed
+ */
+ for (i = 1; i < s->frames; i++) {
+ s->mp3decctx[i] = av_mallocz(sizeof(MPADecodeContext));
+ s->mp3decctx[i]->compute_antialias = s->mp3decctx[0]->compute_antialias;
+ s->mp3decctx[i]->inbuf = &s->mp3decctx[i]->inbuf1[0][BACKSTEP_SIZE];
+ s->mp3decctx[i]->inbuf_ptr = s->mp3decctx[i]->inbuf;
+ s->mp3decctx[i]->adu_mode = 1;
+ }
+
+ return 0;
+}
+
+
+static int decode_close_mp3on4(AVCodecContext * avctx)
+{
+ MP3On4DecodeContext *s = avctx->priv_data;
+ int i;
+
+ for (i = 0; i < s->frames; i++)
+ if (s->mp3decctx[i])
+ av_free(s->mp3decctx[i]);
+
+ return 0;
+}
+
+
+static int decode_frame_mp3on4(AVCodecContext * avctx,
+ void *data, int *data_size,
+ uint8_t * buf, int buf_size)
+{
+ MP3On4DecodeContext *s = avctx->priv_data;
+ MPADecodeContext *m;
+ int len, out_size = 0;
+ uint32_t header;
+ OUT_INT *out_samples = data;
+ OUT_INT decoded_buf[MPA_FRAME_SIZE * MPA_MAX_CHANNELS];
+ OUT_INT *outptr, *bp;
+ int fsize;
+ unsigned char *start2 = buf, *start;
+ int fr, i, j, n;
+ int off = avctx->channels;
+ int *coff = chan_offset[s->chan_cfg];
+
+ len = buf_size;
+
+ // Discard too short frames
+ if (buf_size < HEADER_SIZE) {
+ *data_size = 0;
+ return buf_size;
+ }
+
+ // If only one decoder interleave is not needed
+ outptr = s->frames == 1 ? out_samples : decoded_buf;
+
+ for (fr = 0; fr < s->frames; fr++) {
+ start = start2;
+ fsize = (start[0] << 4) | (start[1] >> 4);
+ start2 += fsize;
+ if (fsize > len)
+ fsize = len;
+ len -= fsize;
+ if (fsize > MPA_MAX_CODED_FRAME_SIZE)
+ fsize = MPA_MAX_CODED_FRAME_SIZE;
+ m = s->mp3decctx[fr];
+ assert (m != NULL);
+ /* copy original to new */
+ m->inbuf_ptr = m->inbuf + fsize;
+ memcpy(m->inbuf, start, fsize);
+
+ // Get header
+ header = (m->inbuf[0] << 24) | (m->inbuf[1] << 16) |
+ (m->inbuf[2] << 8) | m->inbuf[3] | 0xfff00000;
+
+ if (ff_mpa_check_header(header) < 0) { // Bad header, discard block
+ *data_size = 0;
+ return buf_size;
+ }
+
+ decode_header(m, header);
+ mp_decode_frame(m, decoded_buf);
+
+ n = MPA_FRAME_SIZE * m->nb_channels;
+ out_size += n * sizeof(OUT_INT);
+ if(s->frames > 1) {
+ /* interleave output data */
+ bp = out_samples + coff[fr];
+ if(m->nb_channels == 1) {
+ for(j = 0; j < n; j++) {
+ *bp = decoded_buf[j];
+ bp += off;
+ }
+ } else {
+ for(j = 0; j < n; j++) {
+ bp[0] = decoded_buf[j++];
+ bp[1] = decoded_buf[j];
+ bp += off;
+ }
+ }
+ }
+ }
+
+ /* update codec info */
+ avctx->sample_rate = s->mp3decctx[0]->sample_rate;
+ avctx->frame_size= buf_size;
+ avctx->bit_rate = 0;
+ for (i = 0; i < s->frames; i++)
+ avctx->bit_rate += s->mp3decctx[i]->bit_rate;
+
+ *data_size = out_size;
+ return buf_size;
+}
+
+
AVCodec mp2_decoder =
{
"mp2",
decode_frame_adu,
CODEC_CAP_PARSE_ONLY,
};
+
+AVCodec mp3on4_decoder =
+{
+ "mp3on4",
+ CODEC_TYPE_AUDIO,
+ CODEC_ID_MP3ON4,
+ sizeof(MP3On4DecodeContext),
+ decode_init_mp3on4,
+ NULL,
+ decode_close_mp3on4,
+ decode_frame_mp3on4,
+ 0
+};
projects / ffmpeg / blobdiff