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1 | /* | ||
2 | * RealAudio 2.0 (28.8K) | ||
3 | * Copyright (c) 2003 The FFmpeg project | ||
4 | * | ||
5 | * This file is part of FFmpeg. | ||
6 | * | ||
7 | * FFmpeg is free software; you can redistribute it and/or | ||
8 | * modify it under the terms of the GNU Lesser General Public | ||
9 | * License as published by the Free Software Foundation; either | ||
10 | * version 2.1 of the License, or (at your option) any later version. | ||
11 | * | ||
12 | * FFmpeg is distributed in the hope that it will be useful, | ||
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
15 | * Lesser General Public License for more details. | ||
16 | * | ||
17 | * You should have received a copy of the GNU Lesser General Public | ||
18 | * License along with FFmpeg; if not, write to the Free Software | ||
19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
20 | */ | ||
21 | |||
22 | #include "libavutil/channel_layout.h" | ||
23 | #include "libavutil/float_dsp.h" | ||
24 | #include "libavutil/internal.h" | ||
25 | #include "libavutil/mem.h" | ||
26 | #include "libavutil/mem_internal.h" | ||
27 | |||
28 | #define BITSTREAM_READER_LE | ||
29 | #include "avcodec.h" | ||
30 | #include "celp_filters.h" | ||
31 | #include "codec_internal.h" | ||
32 | #include "decode.h" | ||
33 | #include "get_bits.h" | ||
34 | #include "lpc_functions.h" | ||
35 | #include "ra288.h" | ||
36 | |||
37 | #define MAX_BACKWARD_FILTER_ORDER 36 | ||
38 | #define MAX_BACKWARD_FILTER_LEN 40 | ||
39 | #define MAX_BACKWARD_FILTER_NONREC 35 | ||
40 | #define ATTEN 0.5625 | ||
41 | #include "g728_template.c" | ||
42 | |||
43 | #define RA288_BLOCK_SIZE 5 | ||
44 | #define RA288_BLOCKS_PER_FRAME 32 | ||
45 | |||
46 | typedef struct RA288Context { | ||
47 | void (*vector_fmul)(float *dst, const float *src0, const float *src1, | ||
48 | int len); | ||
49 | DECLARE_ALIGNED(32, float, sp_lpc)[FFALIGN(36, 16)]; ///< LPC coefficients for speech data (spec: A) | ||
50 | DECLARE_ALIGNED(32, float, gain_lpc)[FFALIGN(10, 16)]; ///< LPC coefficients for gain (spec: GB) | ||
51 | |||
52 | /** speech data history (spec: SB). | ||
53 | * Its first 70 coefficients are updated only at backward filtering. | ||
54 | */ | ||
55 | float sp_hist[111]; | ||
56 | |||
57 | /// speech part of the gain autocorrelation (spec: REXP) | ||
58 | float sp_rec[37]; | ||
59 | |||
60 | /** log-gain history (spec: SBLG). | ||
61 | * Its first 28 coefficients are updated only at backward filtering. | ||
62 | */ | ||
63 | float gain_hist[38]; | ||
64 | |||
65 | /// recursive part of the gain autocorrelation (spec: REXPLG) | ||
66 | float gain_rec[11]; | ||
67 | } RA288Context; | ||
68 | |||
69 | 2 | static av_cold int ra288_decode_init(AVCodecContext *avctx) | |
70 | { | ||
71 | 2 | RA288Context *ractx = avctx->priv_data; | |
72 | AVFloatDSPContext *fdsp; | ||
73 | |||
74 | 2 | av_channel_layout_uninit(&avctx->ch_layout); | |
75 | 2 | avctx->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO; | |
76 | 2 | avctx->sample_fmt = AV_SAMPLE_FMT_FLT; | |
77 | |||
78 |
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2 | if (avctx->block_align != 38) { |
79 | ✗ | av_log(avctx, AV_LOG_ERROR, "unsupported block align\n"); | |
80 | ✗ | return AVERROR_PATCHWELCOME; | |
81 | } | ||
82 | |||
83 | 2 | fdsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT); | |
84 |
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2 | if (!fdsp) |
85 | ✗ | return AVERROR(ENOMEM); | |
86 | 2 | ractx->vector_fmul = fdsp->vector_fmul; | |
87 | 2 | av_free(fdsp); | |
88 | |||
89 | 2 | return 0; | |
90 | } | ||
91 | |||
92 | 78368 | static void decode(RA288Context *ractx, float gain, int cb_coef) | |
93 | { | ||
94 | int i; | ||
95 | double sumsum; | ||
96 | float sum, buffer[5]; | ||
97 | 78368 | float *block = ractx->sp_hist + 70 + 36; // current block | |
98 | 78368 | float *gain_block = ractx->gain_hist + 28; | |
99 | |||
100 | 78368 | memmove(ractx->sp_hist + 70, ractx->sp_hist + 75, 36*sizeof(*block)); | |
101 | |||
102 | /* block 46 of G.728 spec */ | ||
103 | 78368 | sum = 32.0; | |
104 |
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862048 | for (i=0; i < 10; i++) |
105 | 783680 | sum -= gain_block[9-i] * ractx->gain_lpc[i]; | |
106 | |||
107 | /* block 47 of G.728 spec */ | ||
108 | 78368 | sum = av_clipf(sum, 0, 60); | |
109 | |||
110 | /* block 48 of G.728 spec */ | ||
111 | /* exp(sum * 0.1151292546497) == pow(10.0,sum/20) */ | ||
112 | 78368 | sumsum = exp(sum * 0.1151292546497) * gain * (1.0/(1<<23)); | |
113 | |||
114 |
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470208 | for (i=0; i < 5; i++) |
115 | 391840 | buffer[i] = codetable[cb_coef][i] * sumsum; | |
116 | |||
117 | 78368 | sum = ff_scalarproduct_float_c(buffer, buffer, 5); | |
118 | |||
119 |
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78368 | sum = FFMAX(sum, 5.0 / (1<<24)); |
120 | |||
121 | /* shift and store */ | ||
122 | 78368 | memmove(gain_block, gain_block + 1, 9 * sizeof(*gain_block)); | |
123 | |||
124 | 78368 | gain_block[9] = 10 * log10(sum) + (10*log10(((1<<24)/5.)) - 32); | |
125 | |||
126 | 78368 | ff_celp_lp_synthesis_filterf(block, ractx->sp_lpc, buffer, 5, 36); | |
127 | 78368 | } | |
128 | |||
129 | /** | ||
130 | * Backward synthesis filter, find the LPC coefficients from past speech data. | ||
131 | */ | ||
132 | 19592 | static void backward_filter(RA288Context *ractx, | |
133 | float *hist, float *rec, const float *window, | ||
134 | float *lpc, const float *tab, | ||
135 | int order, int n, int non_rec, int move_size) | ||
136 | { | ||
137 | float temp[MAX_BACKWARD_FILTER_ORDER+1]; | ||
138 | |||
139 | 19592 | do_hybrid_window(ractx->vector_fmul, order, n, non_rec, temp, hist, rec, window); | |
140 | |||
141 |
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19592 | if (!compute_lpc_coefs(temp, 0, order, lpc, 0, 1, 1, NULL)) |
142 | 19588 | ractx->vector_fmul(lpc, lpc, tab, FFALIGN(order, 16)); | |
143 | |||
144 | 19592 | memmove(hist, hist + n, move_size*sizeof(*hist)); | |
145 | 19592 | } | |
146 | |||
147 | 2449 | static int ra288_decode_frame(AVCodecContext * avctx, AVFrame *frame, | |
148 | int *got_frame_ptr, AVPacket *avpkt) | ||
149 | { | ||
150 | 2449 | const uint8_t *buf = avpkt->data; | |
151 | 2449 | int buf_size = avpkt->size; | |
152 | float *out; | ||
153 | int i, ret; | ||
154 | 2449 | RA288Context *ractx = avctx->priv_data; | |
155 | GetBitContext gb; | ||
156 | |||
157 |
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2449 | if (buf_size < avctx->block_align) { |
158 | ✗ | av_log(avctx, AV_LOG_ERROR, | |
159 | "Error! Input buffer is too small [%d<%d]\n", | ||
160 | buf_size, avctx->block_align); | ||
161 | ✗ | return AVERROR_INVALIDDATA; | |
162 | } | ||
163 | |||
164 | 2449 | ret = init_get_bits8(&gb, buf, avctx->block_align); | |
165 |
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2449 | if (ret < 0) |
166 | ✗ | return ret; | |
167 | |||
168 | /* get output buffer */ | ||
169 | 2449 | frame->nb_samples = RA288_BLOCK_SIZE * RA288_BLOCKS_PER_FRAME; | |
170 |
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2449 | if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
171 | ✗ | return ret; | |
172 | 2449 | out = (float *)frame->data[0]; | |
173 | |||
174 |
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80817 | for (i=0; i < RA288_BLOCKS_PER_FRAME; i++) { |
175 | 78368 | float gain = amptable[get_bits(&gb, 3)]; | |
176 | 78368 | int cb_coef = get_bits(&gb, 6 + (i&1)); | |
177 | |||
178 | 78368 | decode(ractx, gain, cb_coef); | |
179 | |||
180 | 78368 | memcpy(out, &ractx->sp_hist[70 + 36], RA288_BLOCK_SIZE * sizeof(*out)); | |
181 | 78368 | out += RA288_BLOCK_SIZE; | |
182 | |||
183 |
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78368 | if ((i & 7) == 3) { |
184 | 9796 | backward_filter(ractx, ractx->sp_hist, ractx->sp_rec, syn_window, | |
185 | 9796 | ractx->sp_lpc, syn_bw_tab, 36, 40, 35, 70); | |
186 | |||
187 | 9796 | backward_filter(ractx, ractx->gain_hist, ractx->gain_rec, gain_window, | |
188 | 9796 | ractx->gain_lpc, gain_bw_tab, 10, 8, 20, 28); | |
189 | } | ||
190 | } | ||
191 | |||
192 | 2449 | *got_frame_ptr = 1; | |
193 | |||
194 | 2449 | return avctx->block_align; | |
195 | } | ||
196 | |||
197 | const FFCodec ff_ra_288_decoder = { | ||
198 | .p.name = "real_288", | ||
199 | CODEC_LONG_NAME("RealAudio 2.0 (28.8K)"), | ||
200 | .p.type = AVMEDIA_TYPE_AUDIO, | ||
201 | .p.id = AV_CODEC_ID_RA_288, | ||
202 | .priv_data_size = sizeof(RA288Context), | ||
203 | .init = ra288_decode_init, | ||
204 | FF_CODEC_DECODE_CB(ra288_decode_frame), | ||
205 | .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF, | ||
206 | }; | ||
207 |