Libav
af_aformat.c
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1 /*
2  * Copyright (c) 2011 Mina Nagy Zaki
3  *
4  * This file is part of Libav.
5  *
6  * Libav is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * Libav is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with Libav; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
26 #include "libavutil/avstring.h"
28 #include "libavutil/common.h"
29 #include "libavutil/opt.h"
30 
31 #include "audio.h"
32 #include "avfilter.h"
33 #include "formats.h"
34 #include "internal.h"
35 
36 typedef struct AFormatContext {
37  const AVClass *class;
38 
42 
43  char *formats_str;
47 
48 #define OFFSET(x) offsetof(AFormatContext, x)
49 #define A AV_OPT_FLAG_AUDIO_PARAM
50 static const AVOption options[] = {
51  { "sample_fmts", "A comma-separated list of sample formats.", OFFSET(formats_str), AV_OPT_TYPE_STRING, .flags = A },
52  { "sample_rates", "A comma-separated list of sample rates.", OFFSET(sample_rates_str), AV_OPT_TYPE_STRING, .flags = A },
53  { "channel_layouts", "A comma-separated list of channel layouts.", OFFSET(channel_layouts_str), AV_OPT_TYPE_STRING, .flags = A },
54  { NULL },
55 };
56 
57 static const AVClass aformat_class = {
58  .class_name = "aformat filter",
59  .item_name = av_default_item_name,
60  .option = options,
61  .version = LIBAVUTIL_VERSION_INT,
62 };
63 
64 #define PARSE_FORMATS(str, type, list, add_to_list, get_fmt, none, desc) \
65 do { \
66  char *next, *cur = str, sep; \
67  \
68  if (str && strchr(str, ',')) { \
69  av_log(ctx, AV_LOG_WARNING, "This syntax is deprecated, use '|' to "\
70  "separate %s.\n", desc); \
71  sep = ','; \
72  } else \
73  sep = '|'; \
74  \
75  while (cur) { \
76  type fmt; \
77  next = strchr(cur, sep); \
78  if (next) \
79  *next++ = 0; \
80  \
81  if ((fmt = get_fmt(cur)) == none) { \
82  av_log(ctx, AV_LOG_ERROR, "Error parsing " desc ": %s.\n", cur);\
83  return AVERROR(EINVAL); \
84  } \
85  add_to_list(&list, fmt); \
86  \
87  cur = next; \
88  } \
89 } while (0)
90 
91 static int get_sample_rate(const char *samplerate)
92 {
93  int ret = strtol(samplerate, NULL, 0);
94  return FFMAX(ret, 0);
95 }
96 
97 static av_cold int init(AVFilterContext *ctx)
98 {
99  AFormatContext *s = ctx->priv;
100 
104  get_sample_rate, 0, "sample rate");
107  "channel layout");
108 
109  return 0;
110 }
111 
113 {
114  AFormatContext *s = ctx->priv;
115 
116  ff_set_common_formats(ctx, s->formats ? s->formats :
122 
123  return 0;
124 }
125 
127  {
128  .name = "default",
129  .type = AVMEDIA_TYPE_AUDIO,
130  },
131  { NULL }
132 };
133 
135  {
136  .name = "default",
137  .type = AVMEDIA_TYPE_AUDIO
138  },
139  { NULL }
140 };
141 
143  .name = "aformat",
144  .description = NULL_IF_CONFIG_SMALL("Convert the input audio to one of the specified formats."),
145  .init = init,
146  .query_formats = query_formats,
147  .priv_size = sizeof(AFormatContext),
148  .priv_class = &aformat_class,
149 
150  .inputs = avfilter_af_aformat_inputs,
151  .outputs = avfilter_af_aformat_outputs,
152 };