diff options
Diffstat (limited to 'contrib/ffmpeg/libavcodec/nellymoserdec.c')
| -rw-r--r-- | contrib/ffmpeg/libavcodec/nellymoserdec.c | 411 |
1 files changed, 0 insertions, 411 deletions
diff --git a/contrib/ffmpeg/libavcodec/nellymoserdec.c b/contrib/ffmpeg/libavcodec/nellymoserdec.c deleted file mode 100644 index 7c83bd562..000000000 --- a/contrib/ffmpeg/libavcodec/nellymoserdec.c +++ /dev/null @@ -1,411 +0,0 @@ -/* - * 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 (2 * NELLY_BUF_LEN) - -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; - DECLARE_ALIGNED_16(float,float_buf[NELLY_SAMPLES]); - float state[64]; - AVRandomState random_state; - GetBitContext gb; - int add_bias; - int scale_bias; - DSPContext dsp; - MDCTContext imdct_ctx; - DECLARE_ALIGNED_16(float,imdct_tmp[NELLY_BUF_LEN]); - DECLARE_ALIGNED_16(float,imdct_out[NELLY_BUF_LEN * 2]); -} NellyMoserDecodeContext; - -static DECLARE_ALIGNED_16(float,sine_window[128]); - -static inline int signed_shift(int i, int shift) { - if (shift > 0) - return i << shift; - return i >> -shift; -} - -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(const 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, const unsigned char block[NELLY_BLOCK_LEN], float audio[NELLY_SAMPLES]) -{ - int i,j; - float buf[NELLY_FILL_LEN], pows[NELLY_FILL_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; - } - - } - - get_sample_bits(buf, bits); - - for (i = 0; i < 2; i++) { - aptr = audio + i * NELLY_BUF_LEN; - - 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) { - aptr[j] = M_SQRT1_2*pows[j]; - if (av_random(&s->random_state) & 1) - aptr[j] *= -1.0; - } else { - v = get_bits(&s->gb, bits[j]); - aptr[j] = dequantization_table[(1<<bits[j])-1+v]*pows[j]; - } - } - memset(&aptr[NELLY_FILL_LEN], 0, - (NELLY_BUF_LEN - NELLY_FILL_LEN) * sizeof(float)); - - s->imdct_ctx.fft.imdct_calc(&s->imdct_ctx, s->imdct_out, - aptr, s->imdct_tmp); - /* XXX: overlapping and windowing should be part of a more - generic imdct function */ - memcpy(&aptr[0],&s->imdct_out[NELLY_BUF_LEN+NELLY_BUF_LEN/2], (NELLY_BUF_LEN/2)*sizeof(float)); - memcpy(&aptr[NELLY_BUF_LEN / 2],&s->imdct_out[0],(NELLY_BUF_LEN/2)*sizeof(float)); - overlap_and_window(s, s->state, aptr); - } -} - -static int decode_init(AVCodecContext * avctx) { - NellyMoserDecodeContext *s = avctx->priv_data; - int i; - - s->avctx = avctx; - av_init_random(0, &s->random_state); - ff_mdct_init(&s->imdct_ctx, 8, 1); - - dsputil_init(&s->dsp, avctx); - - if(s->dsp.float_to_int16 == ff_float_to_int16_c) { - s->add_bias = 385; - s->scale_bias = 8*32768; - } else { - s->add_bias = 0; - s->scale_bias = 1*8; - } - - /* Generate overlap window */ - if (!sine_window[0]) - for (i=0 ; i<128; i++) { - sine_window[i] = sin((i + 0.5) / 256.0 * M_PI); - } - - return 0; -} - -static int decode_tag(AVCodecContext * avctx, - void *data, int *data_size, - const 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; - case 512: // 44100Hz - blocks = 8; break; - default: - av_log(avctx, AV_LOG_ERROR, "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 buf_size; -} - -static int decode_end(AVCodecContext * avctx) { - NellyMoserDecodeContext *s = avctx->priv_data; - - ff_mdct_end(&s->imdct_ctx); - return 0; -} - -AVCodec nellymoser_decoder = { - "nellymoser", - CODEC_TYPE_AUDIO, - CODEC_ID_NELLYMOSER, - sizeof(NellyMoserDecodeContext), - decode_init, - NULL, - decode_end, - decode_tag, -}; - |