FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/ra288.c
Date: 2025-07-08 13:42:56
Exec Total Coverage
Lines: 57 64 89.1%
Functions: 4 4 100.0%
Branches: 17 22 77.3%
Line Branch Exec Source
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