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 "error.h"
20 #include "macros.h"
21 #include "mem.h"
22 #include "samplefmt.h"
23
24 #include <limits.h>
25 #include <stdio.h>
26 #include <string.h>
27
28 typedef struct SampleFmtInfo {
29 char name[8];
30 int bits;
31 int planar;
32 enum AVSampleFormat altform; ///< planar<->packed alternative form
33 } SampleFmtInfo;
34
35 /** this table gives more information about formats */
36 static const SampleFmtInfo sample_fmt_info[AV_SAMPLE_FMT_NB] = {
37 [AV_SAMPLE_FMT_U8] = { .name = "u8", .bits = 8, .planar = 0, .altform = AV_SAMPLE_FMT_U8P },
38 [AV_SAMPLE_FMT_S16] = { .name = "s16", .bits = 16, .planar = 0, .altform = AV_SAMPLE_FMT_S16P },
39 [AV_SAMPLE_FMT_S32] = { .name = "s32", .bits = 32, .planar = 0, .altform = AV_SAMPLE_FMT_S32P },
40 [AV_SAMPLE_FMT_S64] = { .name = "s64", .bits = 64, .planar = 0, .altform = AV_SAMPLE_FMT_S64P },
41 [AV_SAMPLE_FMT_FLT] = { .name = "flt", .bits = 32, .planar = 0, .altform = AV_SAMPLE_FMT_FLTP },
42 [AV_SAMPLE_FMT_DBL] = { .name = "dbl", .bits = 64, .planar = 0, .altform = AV_SAMPLE_FMT_DBLP },
43 [AV_SAMPLE_FMT_U8P] = { .name = "u8p", .bits = 8, .planar = 1, .altform = AV_SAMPLE_FMT_U8 },
44 [AV_SAMPLE_FMT_S16P] = { .name = "s16p", .bits = 16, .planar = 1, .altform = AV_SAMPLE_FMT_S16 },
45 [AV_SAMPLE_FMT_S32P] = { .name = "s32p", .bits = 32, .planar = 1, .altform = AV_SAMPLE_FMT_S32 },
46 [AV_SAMPLE_FMT_S64P] = { .name = "s64p", .bits = 64, .planar = 1, .altform = AV_SAMPLE_FMT_S64 },
47 [AV_SAMPLE_FMT_FLTP] = { .name = "fltp", .bits = 32, .planar = 1, .altform = AV_SAMPLE_FMT_FLT },
48 [AV_SAMPLE_FMT_DBLP] = { .name = "dblp", .bits = 64, .planar = 1, .altform = AV_SAMPLE_FMT_DBL },
49 };
50
av_get_sample_fmt_name(enum AVSampleFormat sample_fmt)51 const char *av_get_sample_fmt_name(enum AVSampleFormat sample_fmt)
52 {
53 if (sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB)
54 return NULL;
55 return sample_fmt_info[sample_fmt].name;
56 }
57
av_get_sample_fmt(const char *name)58 enum AVSampleFormat av_get_sample_fmt(const char *name)
59 {
60 int i;
61
62 for (i = 0; i < AV_SAMPLE_FMT_NB; i++)
63 if (!strcmp(sample_fmt_info[i].name, name))
64 return i;
65 return AV_SAMPLE_FMT_NONE;
66 }
67
av_get_alt_sample_fmt(enum AVSampleFormat sample_fmt, int planar)68 enum AVSampleFormat av_get_alt_sample_fmt(enum AVSampleFormat sample_fmt, int planar)
69 {
70 if (sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB)
71 return AV_SAMPLE_FMT_NONE;
72 if (sample_fmt_info[sample_fmt].planar == planar)
73 return sample_fmt;
74 return sample_fmt_info[sample_fmt].altform;
75 }
76
av_get_packed_sample_fmt(enum AVSampleFormat sample_fmt)77 enum AVSampleFormat av_get_packed_sample_fmt(enum AVSampleFormat sample_fmt)
78 {
79 if (sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB)
80 return AV_SAMPLE_FMT_NONE;
81 if (sample_fmt_info[sample_fmt].planar)
82 return sample_fmt_info[sample_fmt].altform;
83 return sample_fmt;
84 }
85
av_get_planar_sample_fmt(enum AVSampleFormat sample_fmt)86 enum AVSampleFormat av_get_planar_sample_fmt(enum AVSampleFormat sample_fmt)
87 {
88 if (sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB)
89 return AV_SAMPLE_FMT_NONE;
90 if (sample_fmt_info[sample_fmt].planar)
91 return sample_fmt;
92 return sample_fmt_info[sample_fmt].altform;
93 }
94
av_get_sample_fmt_string(char *buf, int buf_size, enum AVSampleFormat sample_fmt)95 char *av_get_sample_fmt_string (char *buf, int buf_size, enum AVSampleFormat sample_fmt)
96 {
97 /* print header */
98 if (sample_fmt < 0)
99 snprintf(buf, buf_size, "name " " depth");
100 else if (sample_fmt < AV_SAMPLE_FMT_NB) {
101 SampleFmtInfo info = sample_fmt_info[sample_fmt];
102 snprintf (buf, buf_size, "%-6s" " %2d ", info.name, info.bits);
103 }
104
105 return buf;
106 }
107
av_get_bytes_per_sample(enum AVSampleFormat sample_fmt)108 int av_get_bytes_per_sample(enum AVSampleFormat sample_fmt)
109 {
110 return sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB ?
111 0 : sample_fmt_info[sample_fmt].bits >> 3;
112 }
113
av_sample_fmt_is_planar(enum AVSampleFormat sample_fmt)114 int av_sample_fmt_is_planar(enum AVSampleFormat sample_fmt)
115 {
116 if (sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB)
117 return 0;
118 return sample_fmt_info[sample_fmt].planar;
119 }
120
av_samples_get_buffer_size(int *linesize, int nb_channels, int nb_samples, enum AVSampleFormat sample_fmt, int align)121 int av_samples_get_buffer_size(int *linesize, int nb_channels, int nb_samples,
122 enum AVSampleFormat sample_fmt, int align)
123 {
124 int line_size;
125 int sample_size = av_get_bytes_per_sample(sample_fmt);
126 int planar = av_sample_fmt_is_planar(sample_fmt);
127
128 /* validate parameter ranges */
129 if (!sample_size || nb_samples <= 0 || nb_channels <= 0)
130 return AVERROR(EINVAL);
131
132 /* auto-select alignment if not specified */
133 if (!align) {
134 if (nb_samples > INT_MAX - 31)
135 return AVERROR(EINVAL);
136 align = 1;
137 nb_samples = FFALIGN(nb_samples, 32);
138 }
139
140 /* check for integer overflow */
141 if (nb_channels > INT_MAX / align ||
142 (int64_t)nb_channels * nb_samples > (INT_MAX - (align * nb_channels)) / sample_size)
143 return AVERROR(EINVAL);
144
145 line_size = planar ? FFALIGN(nb_samples * sample_size, align) :
146 FFALIGN(nb_samples * sample_size * nb_channels, align);
147 if (linesize)
148 *linesize = line_size;
149
150 return planar ? line_size * nb_channels : line_size;
151 }
152
av_samples_fill_arrays(uint8_t **audio_data, int *linesize, const uint8_t *buf, int nb_channels, int nb_samples, enum AVSampleFormat sample_fmt, int align)153 int av_samples_fill_arrays(uint8_t **audio_data, int *linesize,
154 const uint8_t *buf, int nb_channels, int nb_samples,
155 enum AVSampleFormat sample_fmt, int align)
156 {
157 int ch, planar, buf_size, line_size;
158
159 planar = av_sample_fmt_is_planar(sample_fmt);
160 buf_size = av_samples_get_buffer_size(&line_size, nb_channels, nb_samples,
161 sample_fmt, align);
162 if (buf_size < 0)
163 return buf_size;
164
165 if (linesize)
166 *linesize = line_size;
167
168 memset(audio_data, 0, planar
169 ? sizeof(*audio_data) * nb_channels
170 : sizeof(*audio_data));
171
172 if (!buf)
173 return buf_size;
174
175 audio_data[0] = (uint8_t *)buf;
176 for (ch = 1; planar && ch < nb_channels; ch++)
177 audio_data[ch] = audio_data[ch-1] + line_size;
178
179 return buf_size;
180 }
181
av_samples_alloc(uint8_t **audio_data, int *linesize, int nb_channels, int nb_samples, enum AVSampleFormat sample_fmt, int align)182 int av_samples_alloc(uint8_t **audio_data, int *linesize, int nb_channels,
183 int nb_samples, enum AVSampleFormat sample_fmt, int align)
184 {
185 uint8_t *buf;
186 int size = av_samples_get_buffer_size(NULL, nb_channels, nb_samples,
187 sample_fmt, align);
188 if (size < 0)
189 return size;
190
191 buf = av_malloc(size);
192 if (!buf)
193 return AVERROR(ENOMEM);
194
195 size = av_samples_fill_arrays(audio_data, linesize, buf, nb_channels,
196 nb_samples, sample_fmt, align);
197 if (size < 0) {
198 av_free(buf);
199 return size;
200 }
201
202 av_samples_set_silence(audio_data, 0, nb_samples, nb_channels, sample_fmt);
203
204 return size;
205 }
206
av_samples_alloc_array_and_samples(uint8_t ***audio_data, int *linesize, int nb_channels, int nb_samples, enum AVSampleFormat sample_fmt, int align)207 int av_samples_alloc_array_and_samples(uint8_t ***audio_data, int *linesize, int nb_channels,
208 int nb_samples, enum AVSampleFormat sample_fmt, int align)
209 {
210 int ret, nb_planes = av_sample_fmt_is_planar(sample_fmt) ? nb_channels : 1;
211
212 *audio_data = av_calloc(nb_planes, sizeof(**audio_data));
213 if (!*audio_data)
214 return AVERROR(ENOMEM);
215 ret = av_samples_alloc(*audio_data, linesize, nb_channels,
216 nb_samples, sample_fmt, align);
217 if (ret < 0)
218 av_freep(audio_data);
219 return ret;
220 }
221
av_samples_copy(uint8_t **dst, uint8_t * const *src, int dst_offset, int src_offset, int nb_samples, int nb_channels, enum AVSampleFormat sample_fmt)222 int av_samples_copy(uint8_t **dst, uint8_t * const *src, int dst_offset,
223 int src_offset, int nb_samples, int nb_channels,
224 enum AVSampleFormat sample_fmt)
225 {
226 int planar = av_sample_fmt_is_planar(sample_fmt);
227 int planes = planar ? nb_channels : 1;
228 int block_align = av_get_bytes_per_sample(sample_fmt) * (planar ? 1 : nb_channels);
229 int data_size = nb_samples * block_align;
230 int i;
231
232 dst_offset *= block_align;
233 src_offset *= block_align;
234
235 if((dst[0] < src[0] ? src[0] - dst[0] : dst[0] - src[0]) >= data_size) {
236 for (i = 0; i < planes; i++)
237 memcpy(dst[i] + dst_offset, src[i] + src_offset, data_size);
238 } else {
239 for (i = 0; i < planes; i++)
240 memmove(dst[i] + dst_offset, src[i] + src_offset, data_size);
241 }
242
243 return 0;
244 }
245
av_samples_set_silence(uint8_t **audio_data, int offset, int nb_samples, int nb_channels, enum AVSampleFormat sample_fmt)246 int av_samples_set_silence(uint8_t **audio_data, int offset, int nb_samples,
247 int nb_channels, enum AVSampleFormat sample_fmt)
248 {
249 int planar = av_sample_fmt_is_planar(sample_fmt);
250 int planes = planar ? nb_channels : 1;
251 int block_align = av_get_bytes_per_sample(sample_fmt) * (planar ? 1 : nb_channels);
252 int data_size = nb_samples * block_align;
253 int fill_char = (sample_fmt == AV_SAMPLE_FMT_U8 ||
254 sample_fmt == AV_SAMPLE_FMT_U8P) ? 0x80 : 0x00;
255 int i;
256
257 offset *= block_align;
258
259 for (i = 0; i < planes; i++)
260 memset(audio_data[i] + offset, fill_char, data_size);
261
262 return 0;
263 }
264