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path: root/libavutil/samplefmt.c (plain)
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1/*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19#include "common.h"
20#include "samplefmt.h"
21
22#include <stdio.h>
23#include <stdlib.h>
24#include <string.h>
25
26typedef struct SampleFmtInfo {
27 char name[8];
28 int bits;
29 int planar;
30 enum AVSampleFormat altform; ///< planar<->packed alternative form
31} SampleFmtInfo;
32
33/** this table gives more information about formats */
34static const SampleFmtInfo sample_fmt_info[AV_SAMPLE_FMT_NB] = {
35 [AV_SAMPLE_FMT_U8] = { .name = "u8", .bits = 8, .planar = 0, .altform = AV_SAMPLE_FMT_U8P },
36 [AV_SAMPLE_FMT_S16] = { .name = "s16", .bits = 16, .planar = 0, .altform = AV_SAMPLE_FMT_S16P },
37 [AV_SAMPLE_FMT_S32] = { .name = "s32", .bits = 32, .planar = 0, .altform = AV_SAMPLE_FMT_S32P },
38 [AV_SAMPLE_FMT_S64] = { .name = "s64", .bits = 64, .planar = 0, .altform = AV_SAMPLE_FMT_S64P },
39 [AV_SAMPLE_FMT_FLT] = { .name = "flt", .bits = 32, .planar = 0, .altform = AV_SAMPLE_FMT_FLTP },
40 [AV_SAMPLE_FMT_DBL] = { .name = "dbl", .bits = 64, .planar = 0, .altform = AV_SAMPLE_FMT_DBLP },
41 [AV_SAMPLE_FMT_U8P] = { .name = "u8p", .bits = 8, .planar = 1, .altform = AV_SAMPLE_FMT_U8 },
42 [AV_SAMPLE_FMT_S16P] = { .name = "s16p", .bits = 16, .planar = 1, .altform = AV_SAMPLE_FMT_S16 },
43 [AV_SAMPLE_FMT_S32P] = { .name = "s32p", .bits = 32, .planar = 1, .altform = AV_SAMPLE_FMT_S32 },
44 [AV_SAMPLE_FMT_S64P] = { .name = "s64p", .bits = 64, .planar = 1, .altform = AV_SAMPLE_FMT_S64 },
45 [AV_SAMPLE_FMT_FLTP] = { .name = "fltp", .bits = 32, .planar = 1, .altform = AV_SAMPLE_FMT_FLT },
46 [AV_SAMPLE_FMT_DBLP] = { .name = "dblp", .bits = 64, .planar = 1, .altform = AV_SAMPLE_FMT_DBL },
47};
48
49const char *av_get_sample_fmt_name(enum AVSampleFormat sample_fmt)
50{
51 if (sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB)
52 return NULL;
53 return sample_fmt_info[sample_fmt].name;
54}
55
56enum AVSampleFormat av_get_sample_fmt(const char *name)
57{
58 int i;
59
60 for (i = 0; i < AV_SAMPLE_FMT_NB; i++)
61 if (!strcmp(sample_fmt_info[i].name, name))
62 return i;
63 return AV_SAMPLE_FMT_NONE;
64}
65
66enum AVSampleFormat av_get_alt_sample_fmt(enum AVSampleFormat sample_fmt, int planar)
67{
68 if (sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB)
69 return AV_SAMPLE_FMT_NONE;
70 if (sample_fmt_info[sample_fmt].planar == planar)
71 return sample_fmt;
72 return sample_fmt_info[sample_fmt].altform;
73}
74
75enum AVSampleFormat av_get_packed_sample_fmt(enum AVSampleFormat sample_fmt)
76{
77 if (sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB)
78 return AV_SAMPLE_FMT_NONE;
79 if (sample_fmt_info[sample_fmt].planar)
80 return sample_fmt_info[sample_fmt].altform;
81 return sample_fmt;
82}
83
84enum AVSampleFormat av_get_planar_sample_fmt(enum AVSampleFormat sample_fmt)
85{
86 if (sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB)
87 return AV_SAMPLE_FMT_NONE;
88 if (sample_fmt_info[sample_fmt].planar)
89 return sample_fmt;
90 return sample_fmt_info[sample_fmt].altform;
91}
92
93char *av_get_sample_fmt_string (char *buf, int buf_size, enum AVSampleFormat sample_fmt)
94{
95 /* print header */
96 if (sample_fmt < 0)
97 snprintf(buf, buf_size, "name " " depth");
98 else if (sample_fmt < AV_SAMPLE_FMT_NB) {
99 SampleFmtInfo info = sample_fmt_info[sample_fmt];
100 snprintf (buf, buf_size, "%-6s" " %2d ", info.name, info.bits);
101 }
102
103 return buf;
104}
105
106int av_get_bytes_per_sample(enum AVSampleFormat sample_fmt)
107{
108 return sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB ?
109 0 : sample_fmt_info[sample_fmt].bits >> 3;
110}
111
112int av_sample_fmt_is_planar(enum AVSampleFormat sample_fmt)
113{
114 if (sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB)
115 return 0;
116 return sample_fmt_info[sample_fmt].planar;
117}
118
119int av_samples_get_buffer_size(int *linesize, int nb_channels, int nb_samples,
120 enum AVSampleFormat sample_fmt, int align)
121{
122 int line_size;
123 int sample_size = av_get_bytes_per_sample(sample_fmt);
124 int planar = av_sample_fmt_is_planar(sample_fmt);
125
126 /* validate parameter ranges */
127 if (!sample_size || nb_samples <= 0 || nb_channels <= 0)
128 return AVERROR(EINVAL);
129
130 /* auto-select alignment if not specified */
131 if (!align) {
132 if (nb_samples > INT_MAX - 31)
133 return AVERROR(EINVAL);
134 align = 1;
135 nb_samples = FFALIGN(nb_samples, 32);
136 }
137
138 /* check for integer overflow */
139 if (nb_channels > INT_MAX / align ||
140 (int64_t)nb_channels * nb_samples > (INT_MAX - (align * nb_channels)) / sample_size)
141 return AVERROR(EINVAL);
142
143 line_size = planar ? FFALIGN(nb_samples * sample_size, align) :
144 FFALIGN(nb_samples * sample_size * nb_channels, align);
145 if (linesize)
146 *linesize = line_size;
147
148 return planar ? line_size * nb_channels : line_size;
149}
150
151int av_samples_fill_arrays(uint8_t **audio_data, int *linesize,
152 const uint8_t *buf, int nb_channels, int nb_samples,
153 enum AVSampleFormat sample_fmt, int align)
154{
155 int ch, planar, buf_size, line_size;
156
157 planar = av_sample_fmt_is_planar(sample_fmt);
158 buf_size = av_samples_get_buffer_size(&line_size, nb_channels, nb_samples,
159 sample_fmt, align);
160 if (buf_size < 0)
161 return buf_size;
162
163 audio_data[0] = (uint8_t *)buf;
164 for (ch = 1; planar && ch < nb_channels; ch++)
165 audio_data[ch] = audio_data[ch-1] + line_size;
166
167 if (linesize)
168 *linesize = line_size;
169
170 return buf_size;
171}
172
173int av_samples_alloc(uint8_t **audio_data, int *linesize, int nb_channels,
174 int nb_samples, enum AVSampleFormat sample_fmt, int align)
175{
176 uint8_t *buf;
177 int size = av_samples_get_buffer_size(NULL, nb_channels, nb_samples,
178 sample_fmt, align);
179 if (size < 0)
180 return size;
181
182 buf = av_malloc(size);
183 if (!buf)
184 return AVERROR(ENOMEM);
185
186 size = av_samples_fill_arrays(audio_data, linesize, buf, nb_channels,
187 nb_samples, sample_fmt, align);
188 if (size < 0) {
189 av_free(buf);
190 return size;
191 }
192
193 av_samples_set_silence(audio_data, 0, nb_samples, nb_channels, sample_fmt);
194
195 return size;
196}
197
198int av_samples_alloc_array_and_samples(uint8_t ***audio_data, int *linesize, int nb_channels,
199 int nb_samples, enum AVSampleFormat sample_fmt, int align)
200{
201 int ret, nb_planes = av_sample_fmt_is_planar(sample_fmt) ? nb_channels : 1;
202
203 *audio_data = av_calloc(nb_planes, sizeof(**audio_data));
204 if (!*audio_data)
205 return AVERROR(ENOMEM);
206 ret = av_samples_alloc(*audio_data, linesize, nb_channels,
207 nb_samples, sample_fmt, align);
208 if (ret < 0)
209 av_freep(audio_data);
210 return ret;
211}
212
213int av_samples_copy(uint8_t **dst, uint8_t * const *src, int dst_offset,
214 int src_offset, int nb_samples, int nb_channels,
215 enum AVSampleFormat sample_fmt)
216{
217 int planar = av_sample_fmt_is_planar(sample_fmt);
218 int planes = planar ? nb_channels : 1;
219 int block_align = av_get_bytes_per_sample(sample_fmt) * (planar ? 1 : nb_channels);
220 int data_size = nb_samples * block_align;
221 int i;
222
223 dst_offset *= block_align;
224 src_offset *= block_align;
225
226 if((dst[0] < src[0] ? src[0] - dst[0] : dst[0] - src[0]) >= data_size) {
227 for (i = 0; i < planes; i++)
228 memcpy(dst[i] + dst_offset, src[i] + src_offset, data_size);
229 } else {
230 for (i = 0; i < planes; i++)
231 memmove(dst[i] + dst_offset, src[i] + src_offset, data_size);
232 }
233
234 return 0;
235}
236
237int av_samples_set_silence(uint8_t **audio_data, int offset, int nb_samples,
238 int nb_channels, enum AVSampleFormat sample_fmt)
239{
240 int planar = av_sample_fmt_is_planar(sample_fmt);
241 int planes = planar ? nb_channels : 1;
242 int block_align = av_get_bytes_per_sample(sample_fmt) * (planar ? 1 : nb_channels);
243 int data_size = nb_samples * block_align;
244 int fill_char = (sample_fmt == AV_SAMPLE_FMT_U8 ||
245 sample_fmt == AV_SAMPLE_FMT_U8P) ? 0x80 : 0x00;
246 int i;
247
248 offset *= block_align;
249
250 for (i = 0; i < planes; i++)
251 memset(audio_data[i] + offset, fill_char, data_size);
252
253 return 0;
254}
255
generated by cgit at 2024-05-17 18:51:26 (GMT)