2 * This file is part of Libav.
4 * Libav 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.
9 * Libav 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.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with Libav; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 #include "samplefmt.h"
26 typedef struct SampleFmtInfo {
30 enum AVSampleFormat altform; ///< planar<->packed alternative form
33 /** this table gives more information about formats */
34 static 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_FLT] = { .name = "flt", .bits = 32, .planar = 0, .altform = AV_SAMPLE_FMT_FLTP },
39 [AV_SAMPLE_FMT_DBL] = { .name = "dbl", .bits = 64, .planar = 0, .altform = AV_SAMPLE_FMT_DBLP },
40 [AV_SAMPLE_FMT_U8P] = { .name = "u8p", .bits = 8, .planar = 1, .altform = AV_SAMPLE_FMT_U8 },
41 [AV_SAMPLE_FMT_S16P] = { .name = "s16p", .bits = 16, .planar = 1, .altform = AV_SAMPLE_FMT_S16 },
42 [AV_SAMPLE_FMT_S32P] = { .name = "s32p", .bits = 32, .planar = 1, .altform = AV_SAMPLE_FMT_S32 },
43 [AV_SAMPLE_FMT_FLTP] = { .name = "fltp", .bits = 32, .planar = 1, .altform = AV_SAMPLE_FMT_FLT },
44 [AV_SAMPLE_FMT_DBLP] = { .name = "dblp", .bits = 64, .planar = 1, .altform = AV_SAMPLE_FMT_DBL },
47 const char *av_get_sample_fmt_name(enum AVSampleFormat sample_fmt)
49 if (sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB)
51 return sample_fmt_info[sample_fmt].name;
54 enum AVSampleFormat av_get_sample_fmt(const char *name)
58 for (i = 0; i < AV_SAMPLE_FMT_NB; i++)
59 if (!strcmp(sample_fmt_info[i].name, name))
61 return AV_SAMPLE_FMT_NONE;
64 enum AVSampleFormat av_get_packed_sample_fmt(enum AVSampleFormat sample_fmt)
66 if (sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB)
67 return AV_SAMPLE_FMT_NONE;
68 if (sample_fmt_info[sample_fmt].planar)
69 return sample_fmt_info[sample_fmt].altform;
73 enum AVSampleFormat av_get_planar_sample_fmt(enum AVSampleFormat sample_fmt)
75 if (sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB)
76 return AV_SAMPLE_FMT_NONE;
77 if (sample_fmt_info[sample_fmt].planar)
79 return sample_fmt_info[sample_fmt].altform;
82 char *av_get_sample_fmt_string (char *buf, int buf_size, enum AVSampleFormat sample_fmt)
86 snprintf(buf, buf_size, "name " " depth");
87 else if (sample_fmt < AV_SAMPLE_FMT_NB) {
88 SampleFmtInfo info = sample_fmt_info[sample_fmt];
89 snprintf (buf, buf_size, "%-6s" " %2d ", info.name, info.bits);
95 int av_get_bytes_per_sample(enum AVSampleFormat sample_fmt)
97 return sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB ?
98 0 : sample_fmt_info[sample_fmt].bits >> 3;
101 int av_sample_fmt_is_planar(enum AVSampleFormat sample_fmt)
103 if (sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB)
105 return sample_fmt_info[sample_fmt].planar;
108 int av_samples_get_buffer_size(int *linesize, int nb_channels, int nb_samples,
109 enum AVSampleFormat sample_fmt, int align)
112 int sample_size = av_get_bytes_per_sample(sample_fmt);
113 int planar = av_sample_fmt_is_planar(sample_fmt);
115 /* validate parameter ranges */
116 if (!sample_size || nb_samples <= 0 || nb_channels <= 0)
117 return AVERROR(EINVAL);
119 /* auto-select alignment if not specified */
122 nb_samples = FFALIGN(nb_samples, 32);
125 /* check for integer overflow */
126 if (nb_channels > INT_MAX / align ||
127 (int64_t)nb_channels * nb_samples > (INT_MAX - (align * nb_channels)) / sample_size)
128 return AVERROR(EINVAL);
130 line_size = planar ? FFALIGN(nb_samples * sample_size, align) :
131 FFALIGN(nb_samples * sample_size * nb_channels, align);
133 *linesize = line_size;
135 return planar ? line_size * nb_channels : line_size;
138 int av_samples_fill_arrays(uint8_t **audio_data, int *linesize,
139 const uint8_t *buf, int nb_channels, int nb_samples,
140 enum AVSampleFormat sample_fmt, int align)
142 int ch, planar, buf_size, line_size;
144 planar = av_sample_fmt_is_planar(sample_fmt);
145 buf_size = av_samples_get_buffer_size(&line_size, nb_channels, nb_samples,
151 for (ch = 1; planar && ch < nb_channels; ch++)
152 audio_data[ch] = audio_data[ch-1] + line_size;
155 *linesize = line_size;
160 int av_samples_alloc(uint8_t **audio_data, int *linesize, int nb_channels,
161 int nb_samples, enum AVSampleFormat sample_fmt, int align)
164 int size = av_samples_get_buffer_size(NULL, nb_channels, nb_samples,
169 buf = av_malloc(size);
171 return AVERROR(ENOMEM);
173 size = av_samples_fill_arrays(audio_data, linesize, buf, nb_channels,
174 nb_samples, sample_fmt, align);
180 av_samples_set_silence(audio_data, 0, nb_samples, nb_channels, sample_fmt);
185 int av_samples_copy(uint8_t **dst, uint8_t * const *src, int dst_offset,
186 int src_offset, int nb_samples, int nb_channels,
187 enum AVSampleFormat sample_fmt)
189 int planar = av_sample_fmt_is_planar(sample_fmt);
190 int planes = planar ? nb_channels : 1;
191 int block_align = av_get_bytes_per_sample(sample_fmt) * (planar ? 1 : nb_channels);
192 int data_size = nb_samples * block_align;
195 dst_offset *= block_align;
196 src_offset *= block_align;
198 for (i = 0; i < planes; i++)
199 memcpy(dst[i] + dst_offset, src[i] + src_offset, data_size);
204 int av_samples_set_silence(uint8_t **audio_data, int offset, int nb_samples,
205 int nb_channels, enum AVSampleFormat sample_fmt)
207 int planar = av_sample_fmt_is_planar(sample_fmt);
208 int planes = planar ? nb_channels : 1;
209 int block_align = av_get_bytes_per_sample(sample_fmt) * (planar ? 1 : nb_channels);
210 int data_size = nb_samples * block_align;
211 int fill_char = (sample_fmt == AV_SAMPLE_FMT_U8 ||
212 sample_fmt == AV_SAMPLE_FMT_U8P) ? 0x80 : 0x00;
215 offset *= block_align;
217 for (i = 0; i < planes; i++)
218 memset(audio_data[i] + offset, fill_char, data_size);