Move sine windows to a separate file
[libav.git] / libavcodec / nellymoserdec.c
1 /*
2 * NellyMoser audio decoder
3 * Copyright (c) 2007 a840bda5870ba11f19698ff6eb9581dfb0f95fa5,
4 * 539459aeb7d425140b62a3ec7dbf6dc8e408a306, and
5 * 520e17cd55896441042b14df2566a6eb610ed444
6 * Copyright (c) 2007 Loic Minier <lool at dooz.org>
7 * Benjamin Larsson
8 *
9 * Permission is hereby granted, free of charge, to any person obtaining a
10 * copy of this software and associated documentation files (the "Software"),
11 * to deal in the Software without restriction, including without limitation
12 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
13 * and/or sell copies of the Software, and to permit persons to whom the
14 * Software is furnished to do so, subject to the following conditions:
15 *
16 * The above copyright notice and this permission notice shall be included in
17 * all copies or substantial portions of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
23 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
24 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
25 * DEALINGS IN THE SOFTWARE.
26 */
27
28 /**
29 * @file
30 * The 3 alphanumeric copyright notices are md5summed they are from the original
31 * implementors. The original code is available from http://code.google.com/p/nelly2pcm/
32 */
33
34 #include "nellymoser.h"
35 #include "libavutil/lfg.h"
36 #include "libavutil/random_seed.h"
37 #include "libavutil/audioconvert.h"
38 #include "avcodec.h"
39 #include "dsputil.h"
40 #include "fft.h"
41 #include "fmtconvert.h"
42 #include "sinewin.h"
43
44 #define ALT_BITSTREAM_READER_LE
45 #include "get_bits.h"
46
47
48 typedef struct NellyMoserDecodeContext {
49 AVCodecContext* avctx;
50 DECLARE_ALIGNED(16, float,float_buf)[NELLY_SAMPLES];
51 float state[128];
52 AVLFG random_state;
53 GetBitContext gb;
54 float scale_bias;
55 DSPContext dsp;
56 FFTContext imdct_ctx;
57 FmtConvertContext fmt_conv;
58 DECLARE_ALIGNED(16, float,imdct_out)[NELLY_BUF_LEN * 2];
59 } NellyMoserDecodeContext;
60
61 static void overlap_and_window(NellyMoserDecodeContext *s, float *state, float *audio, float *a_in)
62 {
63 int bot, top;
64
65 bot = 0;
66 top = NELLY_BUF_LEN-1;
67
68 while (bot < NELLY_BUF_LEN) {
69 audio[bot] = a_in [bot]*ff_sine_128[bot]
70 +state[bot]*ff_sine_128[top];
71
72 bot++;
73 top--;
74 }
75 memcpy(state, a_in + NELLY_BUF_LEN, sizeof(float)*NELLY_BUF_LEN);
76 }
77
78 static void nelly_decode_block(NellyMoserDecodeContext *s,
79 const unsigned char block[NELLY_BLOCK_LEN],
80 float audio[NELLY_SAMPLES])
81 {
82 int i,j;
83 float buf[NELLY_FILL_LEN], pows[NELLY_FILL_LEN];
84 float *aptr, *bptr, *pptr, val, pval;
85 int bits[NELLY_BUF_LEN];
86 unsigned char v;
87
88 init_get_bits(&s->gb, block, NELLY_BLOCK_LEN * 8);
89
90 bptr = buf;
91 pptr = pows;
92 val = ff_nelly_init_table[get_bits(&s->gb, 6)];
93 for (i=0 ; i<NELLY_BANDS ; i++) {
94 if (i > 0)
95 val += ff_nelly_delta_table[get_bits(&s->gb, 5)];
96 pval = -pow(2, val/2048) * s->scale_bias;
97 for (j = 0; j < ff_nelly_band_sizes_table[i]; j++) {
98 *bptr++ = val;
99 *pptr++ = pval;
100 }
101
102 }
103
104 ff_nelly_get_sample_bits(buf, bits);
105
106 for (i = 0; i < 2; i++) {
107 aptr = audio + i * NELLY_BUF_LEN;
108
109 init_get_bits(&s->gb, block, NELLY_BLOCK_LEN * 8);
110 skip_bits_long(&s->gb, NELLY_HEADER_BITS + i*NELLY_DETAIL_BITS);
111
112 for (j = 0; j < NELLY_FILL_LEN; j++) {
113 if (bits[j] <= 0) {
114 aptr[j] = M_SQRT1_2*pows[j];
115 if (av_lfg_get(&s->random_state) & 1)
116 aptr[j] *= -1.0;
117 } else {
118 v = get_bits(&s->gb, bits[j]);
119 aptr[j] = ff_nelly_dequantization_table[(1<<bits[j])-1+v]*pows[j];
120 }
121 }
122 memset(&aptr[NELLY_FILL_LEN], 0,
123 (NELLY_BUF_LEN - NELLY_FILL_LEN) * sizeof(float));
124
125 s->imdct_ctx.imdct_calc(&s->imdct_ctx, s->imdct_out, aptr);
126 /* XXX: overlapping and windowing should be part of a more
127 generic imdct function */
128 overlap_and_window(s, s->state, aptr, s->imdct_out);
129 }
130 }
131
132 static av_cold int decode_init(AVCodecContext * avctx) {
133 NellyMoserDecodeContext *s = avctx->priv_data;
134
135 s->avctx = avctx;
136 av_lfg_init(&s->random_state, 0);
137 ff_mdct_init(&s->imdct_ctx, 8, 1, 1.0);
138
139 dsputil_init(&s->dsp, avctx);
140 ff_fmt_convert_init(&s->fmt_conv, avctx);
141
142 s->scale_bias = 1.0/(1*8);
143
144 /* Generate overlap window */
145 if (!ff_sine_128[127])
146 ff_init_ff_sine_windows(7);
147
148 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
149 avctx->channel_layout = AV_CH_LAYOUT_MONO;
150 return 0;
151 }
152
153 static int decode_tag(AVCodecContext * avctx,
154 void *data, int *data_size,
155 AVPacket *avpkt) {
156 const uint8_t *buf = avpkt->data;
157 int buf_size = avpkt->size;
158 NellyMoserDecodeContext *s = avctx->priv_data;
159 int blocks, i;
160 int16_t* samples;
161 *data_size = 0;
162 samples = (int16_t*)data;
163
164 if (buf_size < avctx->block_align)
165 return buf_size;
166
167 if (buf_size % 64) {
168 av_log(avctx, AV_LOG_ERROR, "Tag size %d.\n", buf_size);
169 return buf_size;
170 }
171 blocks = buf_size / 64;
172 /* Normal numbers of blocks for sample rates:
173 * 8000 Hz - 1
174 * 11025 Hz - 2
175 * 16000 Hz - 3
176 * 22050 Hz - 4
177 * 44100 Hz - 8
178 */
179
180 for (i=0 ; i<blocks ; i++) {
181 nelly_decode_block(s, &buf[i*NELLY_BLOCK_LEN], s->float_buf);
182 s->fmt_conv.float_to_int16(&samples[i*NELLY_SAMPLES], s->float_buf, NELLY_SAMPLES);
183 *data_size += NELLY_SAMPLES*sizeof(int16_t);
184 }
185
186 return buf_size;
187 }
188
189 static av_cold int decode_end(AVCodecContext * avctx) {
190 NellyMoserDecodeContext *s = avctx->priv_data;
191
192 ff_mdct_end(&s->imdct_ctx);
193 return 0;
194 }
195
196 AVCodec ff_nellymoser_decoder = {
197 "nellymoser",
198 AVMEDIA_TYPE_AUDIO,
199 CODEC_ID_NELLYMOSER,
200 sizeof(NellyMoserDecodeContext),
201 decode_init,
202 NULL,
203 decode_end,
204 decode_tag,
205 .long_name = NULL_IF_CONFIG_SMALL("Nellymoser Asao"),
206 };
207