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af_aformat.c
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1 /*
2  * Copyright (c) 2011 Mina Nagy Zaki
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg 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  * FFmpeg 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 FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 /**
22  * @file
23  * format audio filter
24  */
25 
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 #define F AV_OPT_FLAG_FILTERING_PARAM
51 static const AVOption aformat_options[] = {
52  { "sample_fmts", "A comma-separated list of sample formats.", OFFSET(formats_str), AV_OPT_TYPE_STRING, .flags = A|F },
53  { "sample_rates", "A comma-separated list of sample rates.", OFFSET(sample_rates_str), AV_OPT_TYPE_STRING, .flags = A|F },
54  { "channel_layouts", "A comma-separated list of channel layouts.", OFFSET(channel_layouts_str), AV_OPT_TYPE_STRING, .flags = A|F },
55  { NULL }
56 };
57 
58 AVFILTER_DEFINE_CLASS(aformat);
59 
60 #define PARSE_FORMATS(str, type, list, add_to_list, get_fmt, none, desc) \
61 do { \
62  char *next, *cur = str, sep; \
63  \
64  if (str && strchr(str, ',')) { \
65  av_log(ctx, AV_LOG_WARNING, "This syntax is deprecated, use '|' to "\
66  "separate %s.\n", desc); \
67  sep = ','; \
68  } else \
69  sep = '|'; \
70  \
71  while (cur) { \
72  type fmt; \
73  next = strchr(cur, sep); \
74  if (next) \
75  *next++ = 0; \
76  \
77  if ((fmt = get_fmt(cur)) == none) { \
78  av_log(ctx, AV_LOG_ERROR, "Error parsing " desc ": %s.\n", cur);\
79  return AVERROR(EINVAL); \
80  } \
81  add_to_list(&list, fmt); \
82  \
83  cur = next; \
84  } \
85 } while (0)
86 
87 static int get_sample_rate(const char *samplerate)
88 {
89  int ret = strtol(samplerate, NULL, 0);
90  return FFMAX(ret, 0);
91 }
92 
93 static av_cold int init(AVFilterContext *ctx)
94 {
95  AFormatContext *s = ctx->priv;
96 
100  get_sample_rate, 0, "sample rate");
103  "channel layout");
104 
105  return 0;
106 }
107 
109 {
110  AFormatContext *s = ctx->priv;
111  int ret;
112 
113  ret = ff_set_common_formats(ctx, s->formats ? s->formats :
115  if (ret < 0)
116  return ret;
119  if (ret < 0)
120  return ret;
123 }
124 
126  {
127  .name = "default",
128  .type = AVMEDIA_TYPE_AUDIO,
129  },
130  { NULL }
131 };
132 
134  {
135  .name = "default",
136  .type = AVMEDIA_TYPE_AUDIO
137  },
138  { NULL }
139 };
140 
142  .name = "aformat",
143  .description = NULL_IF_CONFIG_SMALL("Convert the input audio to one of the specified formats."),
144  .init = init,
145  .query_formats = query_formats,
146  .priv_size = sizeof(AFormatContext),
147  .priv_class = &aformat_class,
148  .inputs = avfilter_af_aformat_inputs,
149  .outputs = avfilter_af_aformat_outputs,
150 };