mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-23 12:43:46 +02:00
Nellymoser ASAO decoder
Originally committed as revision 10741 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Benjamin Larsson
parent
85aec3bd48
commit
636b13c5fc
@ -99,6 +99,7 @@ version <next>
|
||||
- AMV audio and video decoder
|
||||
- DNxHD encoder
|
||||
- H.264 PAFF decoding
|
||||
- Nellymoser ASAO decoder
|
||||
|
||||
version 0.4.9-pre1:
|
||||
|
||||
|
||||
@ -316,6 +316,7 @@ following image formats are supported:
|
||||
@item DT$ Coherent Audio @tab @tab X
|
||||
@item ATRAC 3 @tab @tab X
|
||||
@item Monkey's Audio @tab @tab X @tab Only versions 3.97-3.99 are supported
|
||||
@item Nellymoser ASAO @tab @tab X
|
||||
@end multitable
|
||||
|
||||
@code{X} means that encoding (resp. decoding) is supported.
|
||||
|
||||
@ -128,6 +128,7 @@ OBJS-$(CONFIG_MSMPEG4V3_ENCODER) += msmpeg4.o msmpeg4data.o mpegvideo_enc.
|
||||
OBJS-$(CONFIG_MSRLE_DECODER) += msrle.o
|
||||
OBJS-$(CONFIG_MSVIDEO1_DECODER) += msvideo1.o
|
||||
OBJS-$(CONFIG_MSZH_DECODER) += lcldec.o
|
||||
OBJS-$(CONFIG_NELLYMOSER_DECODER) += nellymoserdec.o
|
||||
OBJS-$(CONFIG_NUV_DECODER) += nuv.o rtjpeg.o
|
||||
OBJS-$(CONFIG_PAM_ENCODER) += pnmenc.o pnm.o
|
||||
OBJS-$(CONFIG_PBM_ENCODER) += pnmenc.o pnm.o
|
||||
|
||||
@ -199,6 +199,7 @@ void avcodec_register_all(void)
|
||||
REGISTER_DECODER (MP3ADU, mp3adu);
|
||||
REGISTER_DECODER (MP3ON4, mp3on4);
|
||||
REGISTER_DECODER (MPC7, mpc7);
|
||||
REGISTER_DECODER (NELLYMOSER, nellymoser);
|
||||
REGISTER_DECODER (QDM2, qdm2);
|
||||
REGISTER_DECODER (RA_144, ra_144);
|
||||
REGISTER_DECODER (RA_288, ra_288);
|
||||
|
||||
@ -33,8 +33,8 @@
|
||||
#define AV_STRINGIFY(s) AV_TOSTRING(s)
|
||||
#define AV_TOSTRING(s) #s
|
||||
|
||||
#define LIBAVCODEC_VERSION_INT ((51<<16)+(45<<8)+0)
|
||||
#define LIBAVCODEC_VERSION 51.45.0
|
||||
#define LIBAVCODEC_VERSION_INT ((51<<16)+(46<<8)+0)
|
||||
#define LIBAVCODEC_VERSION 51.46.0
|
||||
#define LIBAVCODEC_BUILD LIBAVCODEC_VERSION_INT
|
||||
|
||||
#define LIBAVCODEC_IDENT "Lavc" AV_STRINGIFY(LIBAVCODEC_VERSION)
|
||||
@ -264,6 +264,7 @@ enum CodecID {
|
||||
CODEC_ID_ATRAC3,
|
||||
CODEC_ID_VOXWARE,
|
||||
CODEC_ID_APE,
|
||||
CODEC_ID_NELLYMOSER,
|
||||
|
||||
/* subtitle codecs */
|
||||
CODEC_ID_DVD_SUBTITLE= 0x17000,
|
||||
|
||||
481
libavcodec/nellymoserdec.c
Normal file
481
libavcodec/nellymoserdec.c
Normal file
@ -0,0 +1,481 @@
|
||||
/*
|
||||
* NellyMoser audio decoder
|
||||
* Copyright (c) 2007 a840bda5870ba11f19698ff6eb9581dfb0f95fa5,
|
||||
* 539459aeb7d425140b62a3ec7dbf6dc8e408a306, and
|
||||
* 520e17cd55896441042b14df2566a6eb610ed444
|
||||
* Copyright (c) 2007 Loic Minier <lool at dooz.org>
|
||||
* Benjamin Larsson
|
||||
*
|
||||
* Permission is hereby granted, free of charge, to any person obtaining a
|
||||
* copy of this software and associated documentation files (the "Software"),
|
||||
* to deal in the Software without restriction, including without limitation
|
||||
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
|
||||
* and/or sell copies of the Software, and to permit persons to whom the
|
||||
* Software is furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in
|
||||
* all copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
||||
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
|
||||
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
|
||||
* DEALINGS IN THE SOFTWARE.
|
||||
*/
|
||||
|
||||
/**
|
||||
* @file nellymoserdec.c
|
||||
* The 3 alphanumeric copyright notices are md5summed they are from the original
|
||||
* implementors. The original code is available from http://code.google.com/p/nelly2pcm/
|
||||
*/
|
||||
#include "avcodec.h"
|
||||
#include "random.h"
|
||||
#include "dsputil.h"
|
||||
|
||||
#define ALT_BITSTREAM_READER_LE
|
||||
#include "bitstream.h"
|
||||
|
||||
#define NELLY_BANDS 23
|
||||
#define NELLY_BLOCK_LEN 64
|
||||
#define NELLY_HEADER_BITS 116
|
||||
#define NELLY_DETAIL_BITS 198
|
||||
#define NELLY_BUF_LEN 128
|
||||
#define NELLY_FILL_LEN 124
|
||||
#define NELLY_BIT_CAP 6
|
||||
#define NELLY_BASE_OFF 4228
|
||||
#define NELLY_BASE_SHIFT 19
|
||||
#define NELLY_SAMPLES 256
|
||||
|
||||
static const float dequantization_table[127] = {
|
||||
0.0000000000,-0.8472560048, 0.7224709988, -1.5247479677, -0.4531480074, 0.3753609955, 1.4717899561,
|
||||
-1.9822579622, -1.1929379702, -0.5829370022, -0.0693780035, 0.3909569979,0.9069200158, 1.4862740040,
|
||||
2.2215409279, -2.3887870312, -1.8067539930, -1.4105420113, -1.0773609877, -0.7995010018,-0.5558109879,
|
||||
-0.3334020078, -0.1324490011, 0.0568020009, 0.2548770010, 0.4773550034, 0.7386850119, 1.0443060398,
|
||||
1.3954459429, 1.8098750114, 2.3918759823,-2.3893830776, -1.9884680510, -1.7514040470, -1.5643119812,
|
||||
-1.3922129869,-1.2164649963, -1.0469499826, -0.8905100226, -0.7645580173, -0.6454579830, -0.5259280205,
|
||||
-0.4059549868, -0.3029719889, -0.2096900046, -0.1239869967, -0.0479229987, 0.0257730000, 0.1001340002,
|
||||
0.1737180054, 0.2585540116, 0.3522900045, 0.4569880068, 0.5767750144, 0.7003160119, 0.8425520062,
|
||||
1.0093879700, 1.1821349859, 1.3534560204, 1.5320819616, 1.7332619429, 1.9722349644, 2.3978140354,
|
||||
-2.5756309032, -2.0573320389, -1.8984919786, -1.7727810144, -1.6662600040, -1.5742180347, -1.4993319511,
|
||||
-1.4316639900, -1.3652280569, -1.3000990152, -1.2280930281, -1.1588579416, -1.0921250582, -1.0135740042,
|
||||
-0.9202849865, -0.8287050128, -0.7374889851, -0.6447759867, -0.5590940118, -0.4857139885, -0.4110319912,
|
||||
-0.3459700048, -0.2851159871, -0.2341620028, -0.1870580018, -0.1442500055, -0.1107169986, -0.0739680007,
|
||||
-0.0365610011, -0.0073290002, 0.0203610007, 0.0479039997, 0.0751969963, 0.0980999991, 0.1220389977,
|
||||
0.1458999962, 0.1694349945, 0.1970459968, 0.2252430022, 0.2556869984, 0.2870100141, 0.3197099864,
|
||||
0.3525829911, 0.3889069855, 0.4334920049, 0.4769459963, 0.5204820037, 0.5644530058, 0.6122040153,
|
||||
0.6685929894, 0.7341650128, 0.8032159805, 0.8784040213, 0.9566209912, 1.0397069454, 1.1293770075,
|
||||
1.2211159468, 1.3080279827, 1.4024800062, 1.5056819916, 1.6227730513, 1.7724959850, 1.9430880547,
|
||||
2.2903931141
|
||||
};
|
||||
|
||||
static const uint8_t nelly_band_sizes_table[NELLY_BANDS] = {
|
||||
2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 4, 4, 5, 6, 6, 7, 8, 9, 10, 12, 14, 15
|
||||
};
|
||||
|
||||
static const uint16_t nelly_init_table[64] = {
|
||||
3134, 5342, 6870, 7792, 8569, 9185, 9744, 10191, 10631, 11061, 11434, 11770,
|
||||
12116, 12513, 12925, 13300, 13674, 14027, 14352, 14716, 15117, 15477, 15824,
|
||||
16157, 16513, 16804, 17090, 17401, 17679, 17948, 18238, 18520, 18764, 19078,
|
||||
19381, 19640, 19921, 20205, 20500, 20813, 21162, 21465, 21794, 22137, 22453,
|
||||
22756, 23067, 23350, 23636, 23926, 24227, 24521, 24819, 25107, 25414, 25730,
|
||||
26120, 26497, 26895, 27344, 27877, 28463, 29426, 31355
|
||||
};
|
||||
|
||||
static const int16_t nelly_delta_table[32] = {
|
||||
-11725, -9420, -7910, -6801, -5948, -5233, -4599, -4039, -3507, -3030, -2596,
|
||||
-2170, -1774, -1383, -1016, -660, -329, -1, 337, 696, 1085, 1512, 1962, 2433,
|
||||
2968, 3569, 4314, 5279, 6622, 8154, 10076, 12975
|
||||
};
|
||||
|
||||
typedef struct NellyMoserDecodeContext {
|
||||
AVCodecContext* avctx;
|
||||
float float_buf[NELLY_SAMPLES];
|
||||
float state[64];
|
||||
AVRandomState random_state;
|
||||
GetBitContext gb;
|
||||
int add_bias;
|
||||
int scale_bias;
|
||||
DSPContext dsp;
|
||||
FFTContext fftc;
|
||||
} NellyMoserDecodeContext;
|
||||
|
||||
|
||||
DECLARE_ALIGNED_16(float,sine_window[128]);
|
||||
DECLARE_ALIGNED_16(float,tcos[64]);
|
||||
DECLARE_ALIGNED_16(float,tsin[64]);
|
||||
DECLARE_ALIGNED_16(float,cos_tab[64]);
|
||||
|
||||
static inline int signed_shift(int i, int shift) {
|
||||
if (shift > 0)
|
||||
return i << shift;
|
||||
return i >> -shift;
|
||||
}
|
||||
|
||||
static void antialias(float *buf, float *audio)
|
||||
{
|
||||
int i, end, mid_hi, mid_lo;
|
||||
|
||||
end = NELLY_BUF_LEN-1;
|
||||
mid_hi = NELLY_BUF_LEN/2;
|
||||
mid_lo = mid_hi-1;
|
||||
|
||||
for (i = 0; i < NELLY_BUF_LEN/4; i++) {
|
||||
audio[2*i] = buf[2*i ]*tcos[i ] - buf[end-2*i]*tsin[i];
|
||||
audio[2*i+1] = -(buf[end-2*i ]*tcos[i ] + buf[2*i ]*tsin[i]);
|
||||
audio[end-2*i-1]= buf[end-2*i-1]*tcos[mid_lo-i] - buf[2*i+1 ]*tsin[mid_lo-i];
|
||||
audio[end-2*i ]= -(buf[2*i+1 ]*tcos[mid_lo-i] + buf[end-2*i]*tsin[mid_lo-i]);
|
||||
}
|
||||
}
|
||||
|
||||
static void complex2signal(float *audio)
|
||||
{
|
||||
int i, end, mid_hi, mid_lo;
|
||||
float *aptr, *sigptr, a, b, c, d, e, f, g;
|
||||
|
||||
end = NELLY_BUF_LEN-1;
|
||||
mid_hi = NELLY_BUF_LEN/2;
|
||||
mid_lo = mid_hi-1;
|
||||
|
||||
a = -audio[end];
|
||||
b = audio[end-1];
|
||||
c = -audio[1];
|
||||
d = cos_tab[0];
|
||||
e = audio[0];
|
||||
f = cos_tab[mid_lo];
|
||||
g = cos_tab[1];
|
||||
|
||||
audio[0] = d*e;
|
||||
audio[1] = b*g-a*f;
|
||||
audio[end-1] = a*g+b*f;
|
||||
audio[end] = c*(-d);
|
||||
|
||||
aptr = audio+end-2;
|
||||
sigptr = cos_tab+mid_hi-1;
|
||||
|
||||
for (i = 3; i < NELLY_BUF_LEN/2; i += 2) {
|
||||
a = audio[i-1];
|
||||
b = -audio[i];
|
||||
c = cos_tab[i/2];
|
||||
d = *sigptr;
|
||||
e = *(aptr-1);
|
||||
f = -(*aptr);
|
||||
|
||||
audio[i-1] = a*c+b*d;
|
||||
*aptr = a*d-b*c;
|
||||
|
||||
a = cos_tab[(i/2)+1];
|
||||
b = *(sigptr-1);
|
||||
|
||||
*(aptr-1) = b*e+a*f;
|
||||
audio[i] = a*e-b*f;
|
||||
|
||||
sigptr--;
|
||||
aptr -= 2;
|
||||
}
|
||||
}
|
||||
|
||||
static void overlap_and_window(NellyMoserDecodeContext *s, float *state, float *audio)
|
||||
{
|
||||
int bot, mid_up, mid_down, top;
|
||||
float s_bot, s_top;
|
||||
|
||||
bot = 0;
|
||||
top = NELLY_BUF_LEN-1;
|
||||
mid_up = NELLY_BUF_LEN/2;
|
||||
mid_down = (NELLY_BUF_LEN/2)-1;
|
||||
|
||||
while (bot < NELLY_BUF_LEN/4) {
|
||||
s_bot = audio[bot];
|
||||
s_top = audio[top];
|
||||
audio[bot] = (audio[mid_up]*sine_window[bot]-state[bot ]*sine_window[top])/s->scale_bias + s->add_bias;
|
||||
audio[top] = (-state[bot ]*sine_window[bot]-audio[mid_up]*sine_window[top])/s->scale_bias + s->add_bias;
|
||||
state[bot] = audio[mid_down];
|
||||
|
||||
audio[mid_down] = (s_top *sine_window[mid_down]-state[mid_down]*sine_window[mid_up])/s->scale_bias + s->add_bias;
|
||||
audio[mid_up ] = (-state[mid_down]*sine_window[mid_down]-s_top *sine_window[mid_up])/s->scale_bias + s->add_bias;
|
||||
state[mid_down] = s_bot;
|
||||
|
||||
bot++;
|
||||
mid_up++;
|
||||
mid_down--;
|
||||
top--;
|
||||
}
|
||||
}
|
||||
|
||||
static int sum_bits(short *buf, short shift, short off)
|
||||
{
|
||||
int b, i = 0, ret = 0;
|
||||
|
||||
for (i = 0; i < NELLY_FILL_LEN; i++) {
|
||||
b = buf[i]-off;
|
||||
b = ((b>>(shift-1))+1)>>1;
|
||||
ret += av_clip(b, 0, NELLY_BIT_CAP);
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int headroom(int *la)
|
||||
{
|
||||
int l;
|
||||
if (*la == 0) {
|
||||
return 31;
|
||||
}
|
||||
l = 30 - av_log2(FFABS(*la));
|
||||
*la <<= l;
|
||||
return l;
|
||||
}
|
||||
|
||||
|
||||
static void get_sample_bits(float *buf, int *bits)
|
||||
{
|
||||
int i, j;
|
||||
short sbuf[128];
|
||||
int bitsum = 0, last_bitsum, small_bitsum, big_bitsum;
|
||||
short shift, shift_saved;
|
||||
int max, sum, last_off, tmp;
|
||||
int big_off, small_off;
|
||||
int off;
|
||||
|
||||
max = 0;
|
||||
for (i = 0; i < NELLY_FILL_LEN; i++) {
|
||||
max = FFMAX(max, buf[i]);
|
||||
}
|
||||
shift = -16;
|
||||
shift += headroom(&max);
|
||||
|
||||
sum = 0;
|
||||
for (i = 0; i < NELLY_FILL_LEN; i++) {
|
||||
sbuf[i] = signed_shift(buf[i], shift);
|
||||
sbuf[i] = (3*sbuf[i])>>2;
|
||||
sum += sbuf[i];
|
||||
}
|
||||
|
||||
shift += 11;
|
||||
shift_saved = shift;
|
||||
sum -= NELLY_DETAIL_BITS << shift;
|
||||
shift += headroom(&sum);
|
||||
small_off = (NELLY_BASE_OFF * (sum>>16)) >> 15;
|
||||
shift = shift_saved - (NELLY_BASE_SHIFT+shift-31);
|
||||
|
||||
small_off = signed_shift(small_off, shift);
|
||||
|
||||
bitsum = sum_bits(sbuf, shift_saved, small_off);
|
||||
|
||||
if (bitsum != NELLY_DETAIL_BITS) {
|
||||
shift = 0;
|
||||
off = bitsum - NELLY_DETAIL_BITS;
|
||||
|
||||
for(shift=0; FFABS(off) <= 16383; shift++)
|
||||
off *= 2;
|
||||
|
||||
off = (off * NELLY_BASE_OFF) >> 15;
|
||||
shift = shift_saved-(NELLY_BASE_SHIFT+shift-15);
|
||||
|
||||
off = signed_shift(off, shift);
|
||||
|
||||
for (j = 1; j < 20; j++) {
|
||||
last_off = small_off;
|
||||
small_off += off;
|
||||
last_bitsum = bitsum;
|
||||
|
||||
bitsum = sum_bits(sbuf, shift_saved, small_off);
|
||||
|
||||
if ((bitsum-NELLY_DETAIL_BITS) * (last_bitsum-NELLY_DETAIL_BITS) <= 0)
|
||||
break;
|
||||
}
|
||||
|
||||
if (bitsum > NELLY_DETAIL_BITS) {
|
||||
big_off = small_off;
|
||||
small_off = last_off;
|
||||
big_bitsum=bitsum;
|
||||
small_bitsum=last_bitsum;
|
||||
} else {
|
||||
big_off = last_off;
|
||||
big_bitsum=last_bitsum;
|
||||
small_bitsum=bitsum;
|
||||
}
|
||||
|
||||
while (bitsum != NELLY_DETAIL_BITS && j <= 19) {
|
||||
off = (big_off+small_off)>>1;
|
||||
bitsum = sum_bits(sbuf, shift_saved, off);
|
||||
if (bitsum > NELLY_DETAIL_BITS) {
|
||||
big_off=off;
|
||||
big_bitsum=bitsum;
|
||||
} else {
|
||||
small_off = off;
|
||||
small_bitsum=bitsum;
|
||||
}
|
||||
j++;
|
||||
}
|
||||
|
||||
if (abs(big_bitsum-NELLY_DETAIL_BITS) >=
|
||||
abs(small_bitsum-NELLY_DETAIL_BITS)) {
|
||||
bitsum = small_bitsum;
|
||||
} else {
|
||||
small_off = big_off;
|
||||
bitsum = big_bitsum;
|
||||
}
|
||||
}
|
||||
|
||||
for (i = 0; i < NELLY_FILL_LEN; i++) {
|
||||
tmp = sbuf[i]-small_off;
|
||||
tmp = ((tmp>>(shift_saved-1))+1)>>1;
|
||||
bits[i] = av_clip(tmp, 0, NELLY_BIT_CAP);
|
||||
}
|
||||
|
||||
if (bitsum > NELLY_DETAIL_BITS) {
|
||||
tmp = i = 0;
|
||||
while (tmp < NELLY_DETAIL_BITS) {
|
||||
tmp += bits[i];
|
||||
i++;
|
||||
}
|
||||
|
||||
bits[i-1] -= tmp - NELLY_DETAIL_BITS;
|
||||
for(; i < NELLY_FILL_LEN; i++)
|
||||
bits[i] = 0;
|
||||
}
|
||||
}
|
||||
|
||||
void nelly_decode_block(NellyMoserDecodeContext *s, unsigned char block[NELLY_BLOCK_LEN], float audio[NELLY_SAMPLES])
|
||||
{
|
||||
int i,j;
|
||||
float buf[NELLY_BUF_LEN], pows[NELLY_BUF_LEN];
|
||||
float *aptr, *bptr, *pptr, val, pval;
|
||||
int bits[NELLY_BUF_LEN];
|
||||
unsigned char v;
|
||||
|
||||
init_get_bits(&s->gb, block, NELLY_BLOCK_LEN * 8);
|
||||
|
||||
bptr = buf;
|
||||
pptr = pows;
|
||||
val = nelly_init_table[get_bits(&s->gb, 6)];
|
||||
for (i=0 ; i<NELLY_BANDS ; i++) {
|
||||
if (i > 0)
|
||||
val += nelly_delta_table[get_bits(&s->gb, 5)];
|
||||
pval = pow(2, val/2048);
|
||||
for (j = 0; j < nelly_band_sizes_table[i]; j++) {
|
||||
*bptr++ = val;
|
||||
*pptr++ = pval;
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
memset(&buf[NELLY_FILL_LEN],0,4*sizeof(float));
|
||||
memset(&pows[NELLY_FILL_LEN],0,4*sizeof(float));
|
||||
|
||||
get_sample_bits(buf, bits);
|
||||
|
||||
for (i = 0; i < 2; i++) {
|
||||
aptr = audio+i*128;
|
||||
init_get_bits(&s->gb, block, NELLY_BLOCK_LEN * 8);
|
||||
skip_bits(&s->gb, NELLY_HEADER_BITS + i*NELLY_DETAIL_BITS);
|
||||
|
||||
for (j = 0; j < NELLY_FILL_LEN; j++) {
|
||||
if (bits[j] <= 0) {
|
||||
buf[j] = M_SQRT1_2*pows[j];
|
||||
if (av_random(&s->random_state) & 1)
|
||||
buf[j] *= -1.0;
|
||||
} else {
|
||||
v = get_bits(&s->gb, bits[j]);
|
||||
buf[j] = dequantization_table[(1<<bits[j])-1+v]*pows[j];
|
||||
}
|
||||
}
|
||||
|
||||
antialias(buf, aptr);
|
||||
ff_fft_permute(&s->fftc, (FFTComplex*)aptr);
|
||||
ff_fft_calc(&s->fftc, (FFTComplex*)aptr);
|
||||
complex2signal(aptr);
|
||||
overlap_and_window(s, s->state, aptr);
|
||||
}
|
||||
}
|
||||
|
||||
static int decode_init(AVCodecContext * avctx) {
|
||||
NellyMoserDecodeContext *s = avctx->priv_data;
|
||||
int i;
|
||||
float alpha;
|
||||
|
||||
s->avctx = avctx;
|
||||
av_init_random(0, &s->random_state);
|
||||
ff_fft_init(&s->fftc, 6, 1);
|
||||
dsputil_init(&s->dsp, avctx);
|
||||
|
||||
if(s->dsp.float_to_int16 == ff_float_to_int16_c) {
|
||||
s->add_bias = 385;
|
||||
s->scale_bias = 32768;
|
||||
} else {
|
||||
s->add_bias = 0;
|
||||
s->scale_bias = 1;
|
||||
}
|
||||
|
||||
/* Generate overlap window */
|
||||
if (!sine_window[0])
|
||||
for (i=0 ; i<128; i++) {
|
||||
sine_window[i] = sin((i + 0.5) / 256.0 * M_PI);
|
||||
}
|
||||
|
||||
/* Generate tables */
|
||||
if (!tcos[0])
|
||||
for(i=0;i<64;i++) {
|
||||
alpha = 2*M_PI * (i + 1.0 / 4.0) / 256;
|
||||
tcos[i] = cos(alpha);
|
||||
tsin[i] = -sin(alpha);
|
||||
cos_tab[i] = cos(i/128.0*M_PI)/8.0;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int decode_tag(AVCodecContext * avctx,
|
||||
void *data, int *data_size,
|
||||
uint8_t * buf, int buf_size) {
|
||||
NellyMoserDecodeContext *s = avctx->priv_data;
|
||||
int blocks, i;
|
||||
int16_t* samples;
|
||||
*data_size = 0;
|
||||
samples = (int16_t*)data;
|
||||
|
||||
if (buf_size < avctx->block_align)
|
||||
return buf_size;
|
||||
|
||||
switch (buf_size) {
|
||||
case 64: // 8000Hz
|
||||
blocks = 1; break;
|
||||
case 128: // 11025Hz
|
||||
blocks = 2; break;
|
||||
case 256: // 22050Hz
|
||||
blocks = 4; break;
|
||||
default:
|
||||
av_log(avctx, AV_LOG_DEBUG, "Tag size %d unknown, report sample!\n", buf_size);
|
||||
return buf_size;
|
||||
}
|
||||
|
||||
for (i=0 ; i<blocks ; i++) {
|
||||
nelly_decode_block(s, &buf[i*NELLY_BLOCK_LEN], s->float_buf);
|
||||
s->dsp.float_to_int16(&samples[i*NELLY_SAMPLES], s->float_buf, NELLY_SAMPLES);
|
||||
*data_size += NELLY_SAMPLES*sizeof(int16_t);
|
||||
}
|
||||
|
||||
return blocks*NELLY_SAMPLES*sizeof(int16_t);
|
||||
}
|
||||
|
||||
static int decode_end(AVCodecContext * avctx) {
|
||||
NellyMoserDecodeContext *s = avctx->priv_data;
|
||||
|
||||
ff_fft_end(&s->fftc);
|
||||
return 0;
|
||||
}
|
||||
|
||||
AVCodec nellymoser_decoder = {
|
||||
"nellymoser",
|
||||
CODEC_TYPE_AUDIO,
|
||||
CODEC_ID_NELLYMOSER,
|
||||
sizeof(NellyMoserDecodeContext),
|
||||
decode_init,
|
||||
NULL,
|
||||
decode_end,
|
||||
decode_tag,
|
||||
};
|
||||
|
||||
@ -50,6 +50,8 @@ static void flv_set_audio_codec(AVFormatContext *s, AVStream *astream, int flv_c
|
||||
case FLV_CODECID_NELLYMOSER_8HZ_MONO:
|
||||
acodec->sample_rate = 8000; //in case metadata does not otherwise declare samplerate
|
||||
case FLV_CODECID_NELLYMOSER:
|
||||
acodec->codec_id = CODEC_ID_NELLYMOSER;
|
||||
break;
|
||||
default:
|
||||
av_log(s, AV_LOG_INFO, "Unsupported audio codec (%x)\n", flv_codecid >> FLV_AUDIO_CODECID_OFFSET);
|
||||
acodec->codec_tag = flv_codecid >> FLV_AUDIO_CODECID_OFFSET;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user