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2ba45a60 DM |
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 "libavutil/channel_layout.h" | |
35 | #include "libavutil/float_dsp.h" | |
36 | #include "libavutil/lfg.h" | |
37 | #include "libavutil/random_seed.h" | |
38 | #include "avcodec.h" | |
39 | #include "fft.h" | |
40 | #include "fmtconvert.h" | |
41 | #include "internal.h" | |
42 | #include "nellymoser.h" | |
43 | #include "sinewin.h" | |
44 | ||
45 | #define BITSTREAM_READER_LE | |
46 | #include "get_bits.h" | |
47 | ||
48 | ||
49 | typedef struct NellyMoserDecodeContext { | |
50 | AVCodecContext* avctx; | |
51 | AVLFG random_state; | |
52 | GetBitContext gb; | |
53 | float scale_bias; | |
f6fa7814 | 54 | AVFloatDSPContext *fdsp; |
2ba45a60 DM |
55 | FFTContext imdct_ctx; |
56 | DECLARE_ALIGNED(32, float, imdct_buf)[2][NELLY_BUF_LEN]; | |
57 | float *imdct_out; | |
58 | float *imdct_prev; | |
59 | } NellyMoserDecodeContext; | |
60 | ||
61 | static void nelly_decode_block(NellyMoserDecodeContext *s, | |
62 | const unsigned char block[NELLY_BLOCK_LEN], | |
63 | float audio[NELLY_SAMPLES]) | |
64 | { | |
65 | int i,j; | |
66 | float buf[NELLY_FILL_LEN], pows[NELLY_FILL_LEN]; | |
67 | float *aptr, *bptr, *pptr, val, pval; | |
68 | int bits[NELLY_BUF_LEN]; | |
69 | unsigned char v; | |
70 | ||
71 | init_get_bits(&s->gb, block, NELLY_BLOCK_LEN * 8); | |
72 | ||
73 | bptr = buf; | |
74 | pptr = pows; | |
75 | val = ff_nelly_init_table[get_bits(&s->gb, 6)]; | |
76 | for (i=0 ; i<NELLY_BANDS ; i++) { | |
77 | if (i > 0) | |
78 | val += ff_nelly_delta_table[get_bits(&s->gb, 5)]; | |
79 | pval = -pow(2, val/2048) * s->scale_bias; | |
80 | for (j = 0; j < ff_nelly_band_sizes_table[i]; j++) { | |
81 | *bptr++ = val; | |
82 | *pptr++ = pval; | |
83 | } | |
84 | ||
85 | } | |
86 | ||
87 | ff_nelly_get_sample_bits(buf, bits); | |
88 | ||
89 | for (i = 0; i < 2; i++) { | |
90 | aptr = audio + i * NELLY_BUF_LEN; | |
91 | ||
92 | init_get_bits(&s->gb, block, NELLY_BLOCK_LEN * 8); | |
93 | skip_bits_long(&s->gb, NELLY_HEADER_BITS + i*NELLY_DETAIL_BITS); | |
94 | ||
95 | for (j = 0; j < NELLY_FILL_LEN; j++) { | |
96 | if (bits[j] <= 0) { | |
97 | aptr[j] = M_SQRT1_2*pows[j]; | |
98 | if (av_lfg_get(&s->random_state) & 1) | |
99 | aptr[j] *= -1.0; | |
100 | } else { | |
101 | v = get_bits(&s->gb, bits[j]); | |
102 | aptr[j] = ff_nelly_dequantization_table[(1<<bits[j])-1+v]*pows[j]; | |
103 | } | |
104 | } | |
105 | memset(&aptr[NELLY_FILL_LEN], 0, | |
106 | (NELLY_BUF_LEN - NELLY_FILL_LEN) * sizeof(float)); | |
107 | ||
108 | s->imdct_ctx.imdct_half(&s->imdct_ctx, s->imdct_out, aptr); | |
f6fa7814 | 109 | s->fdsp->vector_fmul_window(aptr, s->imdct_prev + NELLY_BUF_LEN / 2, |
2ba45a60 DM |
110 | s->imdct_out, ff_sine_128, |
111 | NELLY_BUF_LEN / 2); | |
112 | FFSWAP(float *, s->imdct_out, s->imdct_prev); | |
113 | } | |
114 | } | |
115 | ||
116 | static av_cold int decode_init(AVCodecContext * avctx) { | |
117 | NellyMoserDecodeContext *s = avctx->priv_data; | |
118 | ||
119 | s->avctx = avctx; | |
120 | s->imdct_out = s->imdct_buf[0]; | |
121 | s->imdct_prev = s->imdct_buf[1]; | |
122 | av_lfg_init(&s->random_state, 0); | |
123 | ff_mdct_init(&s->imdct_ctx, 8, 1, 1.0); | |
124 | ||
f6fa7814 DM |
125 | s->fdsp = avpriv_float_dsp_alloc(avctx->flags & CODEC_FLAG_BITEXACT); |
126 | if (!s->fdsp) | |
127 | return AVERROR(ENOMEM); | |
2ba45a60 DM |
128 | |
129 | s->scale_bias = 1.0/(32768*8); | |
130 | avctx->sample_fmt = AV_SAMPLE_FMT_FLT; | |
131 | ||
132 | /* Generate overlap window */ | |
133 | if (!ff_sine_128[127]) | |
134 | ff_init_ff_sine_windows(7); | |
135 | ||
136 | avctx->channels = 1; | |
137 | avctx->channel_layout = AV_CH_LAYOUT_MONO; | |
138 | ||
139 | return 0; | |
140 | } | |
141 | ||
142 | static int decode_tag(AVCodecContext *avctx, void *data, | |
143 | int *got_frame_ptr, AVPacket *avpkt) | |
144 | { | |
145 | AVFrame *frame = data; | |
146 | const uint8_t *buf = avpkt->data; | |
147 | const uint8_t *side=av_packet_get_side_data(avpkt, 'F', NULL); | |
148 | int buf_size = avpkt->size; | |
149 | NellyMoserDecodeContext *s = avctx->priv_data; | |
150 | int blocks, i, ret; | |
151 | float *samples_flt; | |
152 | ||
153 | blocks = buf_size / NELLY_BLOCK_LEN; | |
154 | ||
155 | if (blocks <= 0) { | |
156 | av_log(avctx, AV_LOG_ERROR, "Packet is too small\n"); | |
157 | return AVERROR_INVALIDDATA; | |
158 | } | |
159 | ||
160 | if (buf_size % NELLY_BLOCK_LEN) { | |
161 | av_log(avctx, AV_LOG_WARNING, "Leftover bytes: %d.\n", | |
162 | buf_size % NELLY_BLOCK_LEN); | |
163 | } | |
164 | /* Normal numbers of blocks for sample rates: | |
165 | * 8000 Hz - 1 | |
166 | * 11025 Hz - 2 | |
167 | * 16000 Hz - 3 | |
168 | * 22050 Hz - 4 | |
169 | * 44100 Hz - 8 | |
170 | */ | |
171 | if(side && blocks>1 && avctx->sample_rate%11025==0 && (1<<((side[0]>>2)&3)) == blocks) | |
172 | avctx->sample_rate= 11025*(blocks/2); | |
173 | ||
174 | /* get output buffer */ | |
175 | frame->nb_samples = NELLY_SAMPLES * blocks; | |
176 | if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) | |
177 | return ret; | |
178 | samples_flt = (float *)frame->data[0]; | |
179 | ||
180 | for (i=0 ; i<blocks ; i++) { | |
181 | nelly_decode_block(s, buf, samples_flt); | |
182 | samples_flt += NELLY_SAMPLES; | |
183 | buf += NELLY_BLOCK_LEN; | |
184 | } | |
185 | ||
186 | *got_frame_ptr = 1; | |
187 | ||
188 | return buf_size; | |
189 | } | |
190 | ||
191 | static av_cold int decode_end(AVCodecContext * avctx) { | |
192 | NellyMoserDecodeContext *s = avctx->priv_data; | |
193 | ||
194 | ff_mdct_end(&s->imdct_ctx); | |
f6fa7814 | 195 | av_freep(&s->fdsp); |
2ba45a60 DM |
196 | |
197 | return 0; | |
198 | } | |
199 | ||
200 | AVCodec ff_nellymoser_decoder = { | |
201 | .name = "nellymoser", | |
202 | .long_name = NULL_IF_CONFIG_SMALL("Nellymoser Asao"), | |
203 | .type = AVMEDIA_TYPE_AUDIO, | |
204 | .id = AV_CODEC_ID_NELLYMOSER, | |
205 | .priv_data_size = sizeof(NellyMoserDecodeContext), | |
206 | .init = decode_init, | |
207 | .close = decode_end, | |
208 | .decode = decode_tag, | |
209 | .capabilities = CODEC_CAP_DR1 | CODEC_CAP_PARAM_CHANGE, | |
210 | .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLT, | |
211 | AV_SAMPLE_FMT_NONE }, | |
212 | }; |