2007-10-15 16:26:02 +00:00
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/*
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* NellyMoser audio decoder
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* Copyright (c) 2007 a840bda5870ba11f19698ff6eb9581dfb0f95fa5,
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* 539459aeb7d425140b62a3ec7dbf6dc8e408a306, and
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* 520e17cd55896441042b14df2566a6eb610ed444
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* Copyright (c) 2007 Loic Minier <lool at dooz.org>
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* Benjamin Larsson
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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/**
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2009-02-01 02:00:19 +00:00
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* @file libavcodec/nellymoserdec.c
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2007-10-15 16:26:02 +00:00
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* The 3 alphanumeric copyright notices are md5summed they are from the original
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* implementors. The original code is available from http://code.google.com/p/nelly2pcm/
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*/
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2008-05-09 11:56:36 +00:00
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2008-06-08 20:45:18 +00:00
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#include "nellymoser.h"
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2009-03-20 21:15:02 +00:00
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#include "libavutil/lfg.h"
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#include "libavutil/random_seed.h"
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2007-10-15 16:26:02 +00:00
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#include "avcodec.h"
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#include "dsputil.h"
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#define ALT_BITSTREAM_READER_LE
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#include "bitstream.h"
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typedef struct NellyMoserDecodeContext {
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AVCodecContext* avctx;
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2007-10-18 15:16:07 +00:00
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DECLARE_ALIGNED_16(float,float_buf[NELLY_SAMPLES]);
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2008-04-16 14:59:23 +00:00
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float state[128];
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2009-03-20 21:15:02 +00:00
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AVLFG random_state;
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2007-10-15 16:26:02 +00:00
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GetBitContext gb;
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int add_bias;
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2008-04-16 15:28:11 +00:00
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float scale_bias;
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2007-10-15 16:26:02 +00:00
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DSPContext dsp;
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2007-11-03 14:34:25 +00:00
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MDCTContext imdct_ctx;
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DECLARE_ALIGNED_16(float,imdct_out[NELLY_BUF_LEN * 2]);
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2007-10-15 16:26:02 +00:00
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} NellyMoserDecodeContext;
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2008-04-16 13:28:13 +00:00
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static void overlap_and_window(NellyMoserDecodeContext *s, float *state, float *audio, float *a_in)
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2007-10-15 16:26:02 +00:00
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{
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2008-04-16 15:33:30 +00:00
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int bot, top;
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2007-10-15 16:26:02 +00:00
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bot = 0;
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top = NELLY_BUF_LEN-1;
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2008-04-16 15:03:07 +00:00
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while (bot < NELLY_BUF_LEN) {
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2009-01-17 20:06:08 +00:00
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audio[bot] = a_in [bot]*ff_sine_128[bot]
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+state[bot]*ff_sine_128[top] + s->add_bias;
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2007-10-15 16:26:02 +00:00
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bot++;
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top--;
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}
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2008-04-16 14:59:23 +00:00
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memcpy(state, a_in + NELLY_BUF_LEN, sizeof(float)*NELLY_BUF_LEN);
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2007-10-15 16:26:02 +00:00
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}
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2008-05-01 15:20:57 +00:00
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static void nelly_decode_block(NellyMoserDecodeContext *s,
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const unsigned char block[NELLY_BLOCK_LEN],
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float audio[NELLY_SAMPLES])
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2007-10-15 16:26:02 +00:00
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{
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int i,j;
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2007-11-03 14:34:25 +00:00
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float buf[NELLY_FILL_LEN], pows[NELLY_FILL_LEN];
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2007-10-15 16:26:02 +00:00
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float *aptr, *bptr, *pptr, val, pval;
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int bits[NELLY_BUF_LEN];
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unsigned char v;
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init_get_bits(&s->gb, block, NELLY_BLOCK_LEN * 8);
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bptr = buf;
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pptr = pows;
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2008-06-08 20:45:18 +00:00
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val = ff_nelly_init_table[get_bits(&s->gb, 6)];
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2007-10-15 16:26:02 +00:00
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for (i=0 ; i<NELLY_BANDS ; i++) {
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if (i > 0)
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2008-06-08 20:45:18 +00:00
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val += ff_nelly_delta_table[get_bits(&s->gb, 5)];
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2008-04-16 15:30:04 +00:00
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pval = -pow(2, val/2048) * s->scale_bias;
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2008-06-08 20:45:18 +00:00
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for (j = 0; j < ff_nelly_band_sizes_table[i]; j++) {
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2007-10-15 16:26:02 +00:00
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*bptr++ = val;
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*pptr++ = pval;
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}
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}
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2008-06-08 20:45:18 +00:00
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ff_nelly_get_sample_bits(buf, bits);
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2007-10-15 16:26:02 +00:00
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for (i = 0; i < 2; i++) {
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2007-11-03 14:34:25 +00:00
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aptr = audio + i * NELLY_BUF_LEN;
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2007-10-15 16:26:02 +00:00
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init_get_bits(&s->gb, block, NELLY_BLOCK_LEN * 8);
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skip_bits(&s->gb, NELLY_HEADER_BITS + i*NELLY_DETAIL_BITS);
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for (j = 0; j < NELLY_FILL_LEN; j++) {
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if (bits[j] <= 0) {
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2007-11-03 14:34:25 +00:00
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aptr[j] = M_SQRT1_2*pows[j];
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2009-03-20 21:15:02 +00:00
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if (av_lfg_get(&s->random_state) & 1)
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2007-11-03 14:34:25 +00:00
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aptr[j] *= -1.0;
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2007-10-15 16:26:02 +00:00
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} else {
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v = get_bits(&s->gb, bits[j]);
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2008-06-08 20:45:18 +00:00
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aptr[j] = ff_nelly_dequantization_table[(1<<bits[j])-1+v]*pows[j];
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2007-10-15 16:26:02 +00:00
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}
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}
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2007-11-03 14:34:25 +00:00
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memset(&aptr[NELLY_FILL_LEN], 0,
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(NELLY_BUF_LEN - NELLY_FILL_LEN) * sizeof(float));
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2008-08-12 00:38:30 +00:00
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ff_imdct_calc(&s->imdct_ctx, s->imdct_out, aptr);
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2007-11-03 14:34:25 +00:00
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/* XXX: overlapping and windowing should be part of a more
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generic imdct function */
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2008-04-16 13:28:13 +00:00
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overlap_and_window(s, s->state, aptr, s->imdct_out);
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2007-10-15 16:26:02 +00:00
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}
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}
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2008-03-21 03:11:20 +00:00
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static av_cold int decode_init(AVCodecContext * avctx) {
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2007-10-15 16:26:02 +00:00
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NellyMoserDecodeContext *s = avctx->priv_data;
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s->avctx = avctx;
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2009-03-20 21:15:02 +00:00
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av_lfg_init(&s->random_state, ff_random_get_seed());
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2007-11-03 14:34:25 +00:00
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ff_mdct_init(&s->imdct_ctx, 8, 1);
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2007-10-15 16:26:02 +00:00
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dsputil_init(&s->dsp, avctx);
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if(s->dsp.float_to_int16 == ff_float_to_int16_c) {
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s->add_bias = 385;
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2008-04-16 15:28:11 +00:00
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s->scale_bias = 1.0/(8*32768);
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2007-10-15 16:26:02 +00:00
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} else {
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s->add_bias = 0;
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2008-04-16 15:28:11 +00:00
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s->scale_bias = 1.0/(1*8);
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2007-10-15 16:26:02 +00:00
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}
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/* Generate overlap window */
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2009-01-17 20:06:08 +00:00
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if (!ff_sine_128[127])
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ff_sine_window_init(ff_sine_128, 128);
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2007-10-15 16:26:02 +00:00
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2008-07-31 10:47:31 +00:00
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avctx->sample_fmt = SAMPLE_FMT_S16;
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2008-11-16 09:54:09 +00:00
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avctx->channel_layout = CH_LAYOUT_MONO;
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2007-10-15 16:26:02 +00:00
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return 0;
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}
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static int decode_tag(AVCodecContext * avctx,
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void *data, int *data_size,
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2008-02-01 03:26:31 +00:00
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const uint8_t * buf, int buf_size) {
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2007-10-15 16:26:02 +00:00
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NellyMoserDecodeContext *s = avctx->priv_data;
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int blocks, i;
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int16_t* samples;
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*data_size = 0;
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samples = (int16_t*)data;
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if (buf_size < avctx->block_align)
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return buf_size;
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switch (buf_size) {
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case 64: // 8000Hz
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blocks = 1; break;
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case 128: // 11025Hz
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blocks = 2; break;
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case 256: // 22050Hz
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blocks = 4; break;
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2007-11-14 15:31:47 +00:00
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case 512: // 44100Hz
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blocks = 8; break;
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2007-10-15 16:26:02 +00:00
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default:
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2008-07-23 12:21:56 +00:00
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av_log(avctx, AV_LOG_DEBUG, "Tag size %d.\n", buf_size);
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2007-10-15 16:26:02 +00:00
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return buf_size;
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}
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for (i=0 ; i<blocks ; i++) {
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nelly_decode_block(s, &buf[i*NELLY_BLOCK_LEN], s->float_buf);
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s->dsp.float_to_int16(&samples[i*NELLY_SAMPLES], s->float_buf, NELLY_SAMPLES);
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*data_size += NELLY_SAMPLES*sizeof(int16_t);
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}
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2007-11-14 08:22:15 +00:00
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return buf_size;
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2007-10-15 16:26:02 +00:00
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}
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2008-03-21 03:11:20 +00:00
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static av_cold int decode_end(AVCodecContext * avctx) {
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2007-10-15 16:26:02 +00:00
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NellyMoserDecodeContext *s = avctx->priv_data;
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2007-11-03 14:34:25 +00:00
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ff_mdct_end(&s->imdct_ctx);
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2007-10-15 16:26:02 +00:00
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return 0;
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}
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AVCodec nellymoser_decoder = {
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"nellymoser",
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CODEC_TYPE_AUDIO,
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CODEC_ID_NELLYMOSER,
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sizeof(NellyMoserDecodeContext),
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decode_init,
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NULL,
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decode_end,
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decode_tag,
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2008-06-12 21:50:13 +00:00
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.long_name = NULL_IF_CONFIG_SMALL("Nellymoser Asao"),
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2007-10-15 16:26:02 +00:00
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};
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