FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavutil/audio_fifo.c
Date: 2024-02-16 17:37:06
Exec Total Coverage
Lines: 79 104 76.0%
Functions: 10 11 90.9%
Branches: 42 66 63.6%

Line Branch Exec Source
1 /*
2 * Audio FIFO
3 * Copyright (c) 2012 Justin Ruggles <justin.ruggles@gmail.com>
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 /**
23 * @file
24 * Audio FIFO
25 */
26
27 #include <limits.h>
28 #include <stddef.h>
29
30 #include "audio_fifo.h"
31 #include "error.h"
32 #include "fifo.h"
33 #include "macros.h"
34 #include "mem.h"
35 #include "samplefmt.h"
36
37 struct AVAudioFifo {
38 AVFifo **buf; /**< single buffer for interleaved, per-channel buffers for planar */
39 int nb_buffers; /**< number of buffers */
40 int nb_samples; /**< number of samples currently in the FIFO */
41 int allocated_samples; /**< current allocated size, in samples */
42
43 int channels; /**< number of channels */
44 enum AVSampleFormat sample_fmt; /**< sample format */
45 int sample_size; /**< size, in bytes, of one sample in a buffer */
46 };
47
48 135 void av_audio_fifo_free(AVAudioFifo *af)
49 {
50
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135 if (af) {
51
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135 if (af->buf) {
52 int i;
53
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359 for (i = 0; i < af->nb_buffers; i++) {
54 224 av_fifo_freep2(&af->buf[i]);
55 }
56 135 av_freep(&af->buf);
57 }
58 135 av_free(af);
59 }
60 135 }
61
62 135 AVAudioFifo *av_audio_fifo_alloc(enum AVSampleFormat sample_fmt, int channels,
63 int nb_samples)
64 {
65 AVAudioFifo *af;
66 int buf_size, i;
67
68 /* get channel buffer size (also validates parameters) */
69
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135 if (av_samples_get_buffer_size(&buf_size, channels, nb_samples, sample_fmt, 1) < 0)
70 return NULL;
71
72 135 af = av_mallocz(sizeof(*af));
73
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135 if (!af)
74 return NULL;
75
76 135 af->channels = channels;
77 135 af->sample_fmt = sample_fmt;
78 135 af->sample_size = buf_size / nb_samples;
79
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135 af->nb_buffers = av_sample_fmt_is_planar(sample_fmt) ? channels : 1;
80
81 135 af->buf = av_calloc(af->nb_buffers, sizeof(*af->buf));
82
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135 if (!af->buf)
83 goto error;
84
85
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359 for (i = 0; i < af->nb_buffers; i++) {
86 224 af->buf[i] = av_fifo_alloc2(buf_size, 1, 0);
87
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224 if (!af->buf[i])
88 goto error;
89 }
90 135 af->allocated_samples = nb_samples;
91
92 135 return af;
93
94 error:
95 av_audio_fifo_free(af);
96 return NULL;
97 }
98
99 44 int av_audio_fifo_realloc(AVAudioFifo *af, int nb_samples)
100 {
101 44 const size_t cur_size = av_fifo_can_read (af->buf[0]) +
102 44 av_fifo_can_write(af->buf[0]);
103 int i, ret, buf_size;
104
105
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44 if ((ret = av_samples_get_buffer_size(&buf_size, af->channels, nb_samples,
106 af->sample_fmt, 1)) < 0)
107 return ret;
108
109
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44 if (buf_size > cur_size) {
110
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91 for (i = 0; i < af->nb_buffers; i++) {
111
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47 if ((ret = av_fifo_grow2(af->buf[i], buf_size - cur_size)) < 0)
112 return ret;
113 }
114 }
115 44 af->allocated_samples = nb_samples;
116 44 return 0;
117 }
118
119 6506 int av_audio_fifo_write(AVAudioFifo *af, void * const *data, int nb_samples)
120 {
121 int i, ret, size;
122
123 /* automatically reallocate buffers if needed */
124
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6506 if (av_audio_fifo_space(af) < nb_samples) {
125 44 int current_size = av_audio_fifo_size(af);
126 /* check for integer overflow in new size calculation */
127
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44 if (INT_MAX / 2 - current_size < nb_samples)
128 return AVERROR(EINVAL);
129 /* reallocate buffers */
130
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44 if ((ret = av_audio_fifo_realloc(af, 2 * (current_size + nb_samples))) < 0)
131 return ret;
132 }
133
134 6506 size = nb_samples * af->sample_size;
135
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18007 for (i = 0; i < af->nb_buffers; i++) {
136 11501 ret = av_fifo_write(af->buf[i], data[i], size);
137
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11501 if (ret < 0)
138 return AVERROR_BUG;
139 }
140 6506 af->nb_samples += nb_samples;
141
142 6506 return nb_samples;
143 }
144
145 6 int av_audio_fifo_peek(const AVAudioFifo *af, void * const *data, int nb_samples)
146 {
147 6 return av_audio_fifo_peek_at(af, data, nb_samples, 0);
148 }
149
150 60 int av_audio_fifo_peek_at(const AVAudioFifo *af, void * const *data,
151 int nb_samples, int offset)
152 {
153 int i, ret, size;
154
155
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60 if (offset < 0 || offset >= af->nb_samples)
156 return AVERROR(EINVAL);
157
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60 if (nb_samples < 0)
158 return AVERROR(EINVAL);
159 60 nb_samples = FFMIN(nb_samples, af->nb_samples);
160
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60 if (!nb_samples)
161 return 0;
162
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60 if (offset > af->nb_samples - nb_samples)
163 return AVERROR(EINVAL);
164
165 60 offset *= af->sample_size;
166 60 size = nb_samples * af->sample_size;
167
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141 for (i = 0; i < af->nb_buffers; i++) {
168
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81 if ((ret = av_fifo_peek(af->buf[i], data[i], size, offset)) < 0)
169 return AVERROR_BUG;
170 }
171
172 60 return nb_samples;
173 }
174
175 27796 int av_audio_fifo_read(AVAudioFifo *af, void * const *data, int nb_samples)
176 {
177 int i, size;
178
179
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27796 if (nb_samples < 0)
180 return AVERROR(EINVAL);
181 27796 nb_samples = FFMIN(nb_samples, af->nb_samples);
182
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27796 if (!nb_samples)
183 26278 return 0;
184
185 1518 size = nb_samples * af->sample_size;
186
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3039 for (i = 0; i < af->nb_buffers; i++) {
187
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1521 if (av_fifo_read(af->buf[i], data[i], size) < 0)
188 return AVERROR_BUG;
189 }
190 1518 af->nb_samples -= nb_samples;
191
192 1518 return nb_samples;
193 }
194
195 6 int av_audio_fifo_drain(AVAudioFifo *af, int nb_samples)
196 {
197 int i, size;
198
199
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6 if (nb_samples < 0)
200 return AVERROR(EINVAL);
201 6 nb_samples = FFMIN(nb_samples, af->nb_samples);
202
203
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6 if (nb_samples) {
204 6 size = nb_samples * af->sample_size;
205
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15 for (i = 0; i < af->nb_buffers; i++)
206 9 av_fifo_drain2(af->buf[i], size);
207 6 af->nb_samples -= nb_samples;
208 }
209 6 return 0;
210 }
211
212 void av_audio_fifo_reset(AVAudioFifo *af)
213 {
214 int i;
215
216 for (i = 0; i < af->nb_buffers; i++)
217 av_fifo_reset2(af->buf[i]);
218
219 af->nb_samples = 0;
220 }
221
222 112243 int av_audio_fifo_size(AVAudioFifo *af)
223 {
224 112243 return af->nb_samples;
225 }
226
227 6506 int av_audio_fifo_space(AVAudioFifo *af)
228 {
229 6506 return af->allocated_samples - af->nb_samples;
230 }
231