1/*
2 * This file is part of Libav.
3 *
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.
8 *
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.
13 *
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
17 */
18
19#include "samplefmt.h"
20
21#include <stdio.h>
22#include <stdlib.h>
23#include <string.h>
24
25typedef struct SampleFmtInfo {
26    const char *name;
27    int bits;
28    int planar;
29} SampleFmtInfo;
30
31/** this table gives more information about formats */
32static const SampleFmtInfo sample_fmt_info[AV_SAMPLE_FMT_NB] = {
33    [AV_SAMPLE_FMT_U8]   = { .name =   "u8", .bits =  8, .planar = 0 },
34    [AV_SAMPLE_FMT_S16]  = { .name =  "s16", .bits = 16, .planar = 0 },
35    [AV_SAMPLE_FMT_S32]  = { .name =  "s32", .bits = 32, .planar = 0 },
36    [AV_SAMPLE_FMT_FLT]  = { .name =  "flt", .bits = 32, .planar = 0 },
37    [AV_SAMPLE_FMT_DBL]  = { .name =  "dbl", .bits = 64, .planar = 0 },
38    [AV_SAMPLE_FMT_U8P]  = { .name =  "u8p", .bits =  8, .planar = 1 },
39    [AV_SAMPLE_FMT_S16P] = { .name = "s16p", .bits = 16, .planar = 1 },
40    [AV_SAMPLE_FMT_S32P] = { .name = "s32p", .bits = 32, .planar = 1 },
41    [AV_SAMPLE_FMT_FLTP] = { .name = "fltp", .bits = 32, .planar = 1 },
42    [AV_SAMPLE_FMT_DBLP] = { .name = "dblp", .bits = 64, .planar = 1 },
43};
44
45const char *av_get_sample_fmt_name(enum AVSampleFormat sample_fmt)
46{
47    if (sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB)
48        return NULL;
49    return sample_fmt_info[sample_fmt].name;
50}
51
52enum AVSampleFormat av_get_sample_fmt(const char *name)
53{
54    int i;
55
56    for (i = 0; i < AV_SAMPLE_FMT_NB; i++)
57        if (!strcmp(sample_fmt_info[i].name, name))
58            return i;
59    return AV_SAMPLE_FMT_NONE;
60}
61
62char *av_get_sample_fmt_string (char *buf, int buf_size, enum AVSampleFormat sample_fmt)
63{
64    /* print header */
65    if (sample_fmt < 0)
66        snprintf(buf, buf_size, "name  " " depth");
67    else if (sample_fmt < AV_SAMPLE_FMT_NB) {
68        SampleFmtInfo info = sample_fmt_info[sample_fmt];
69        snprintf (buf, buf_size, "%-6s" "   %2d ", info.name, info.bits);
70    }
71
72    return buf;
73}
74
75int av_get_bytes_per_sample(enum AVSampleFormat sample_fmt)
76{
77     return sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB ?
78        0 : sample_fmt_info[sample_fmt].bits >> 3;
79}
80
81#if FF_API_GET_BITS_PER_SAMPLE_FMT
82int av_get_bits_per_sample_fmt(enum AVSampleFormat sample_fmt)
83{
84    return sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB ?
85        0 : sample_fmt_info[sample_fmt].bits;
86}
87#endif
88
89int av_sample_fmt_is_planar(enum AVSampleFormat sample_fmt)
90{
91     if (sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB)
92         return 0;
93     return sample_fmt_info[sample_fmt].planar;
94}
95
96int av_samples_get_buffer_size(int *linesize, int nb_channels, int nb_samples,
97                               enum AVSampleFormat sample_fmt, int align)
98{
99    int line_size;
100    int sample_size = av_get_bytes_per_sample(sample_fmt);
101    int planar      = av_sample_fmt_is_planar(sample_fmt);
102
103    /* validate parameter ranges */
104    if (!sample_size || nb_samples <= 0 || nb_channels <= 0)
105        return AVERROR(EINVAL);
106
107    /* check for integer overflow */
108    if (nb_channels > INT_MAX / align ||
109        (int64_t)nb_channels * nb_samples > (INT_MAX - (align * nb_channels)) / sample_size)
110        return AVERROR(EINVAL);
111
112    line_size = planar ? FFALIGN(nb_samples * sample_size,               align) :
113                         FFALIGN(nb_samples * sample_size * nb_channels, align);
114    if (linesize)
115        *linesize = line_size;
116
117    return planar ? line_size * nb_channels : line_size;
118}
119
120int av_samples_fill_arrays(uint8_t **audio_data, int *linesize,
121                           uint8_t *buf, int nb_channels, int nb_samples,
122                           enum AVSampleFormat sample_fmt, int align)
123{
124    int ch, planar, buf_size;
125
126    planar   = av_sample_fmt_is_planar(sample_fmt);
127    buf_size = av_samples_get_buffer_size(linesize, nb_channels, nb_samples,
128                                          sample_fmt, align);
129    if (buf_size < 0)
130        return buf_size;
131
132    audio_data[0] = buf;
133    for (ch = 1; planar && ch < nb_channels; ch++)
134        audio_data[ch] = audio_data[ch-1] + *linesize;
135
136    return 0;
137}
138
139int av_samples_alloc(uint8_t **audio_data, int *linesize, int nb_channels,
140                     int nb_samples, enum AVSampleFormat sample_fmt, int align)
141{
142    uint8_t *buf;
143    int size = av_samples_get_buffer_size(NULL, nb_channels, nb_samples,
144                                          sample_fmt, align);
145    if (size < 0)
146        return size;
147
148    buf = av_mallocz(size);
149    if (!buf)
150        return AVERROR(ENOMEM);
151
152    size = av_samples_fill_arrays(audio_data, linesize, buf, nb_channels,
153                                  nb_samples, sample_fmt, align);
154    if (size < 0) {
155        av_free(buf);
156        return size;
157    }
158    return 0;
159}
160