2 * Copyright (c) 2011 Mina Nagy Zaki
4 * This file is part of Libav.
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.
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.
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
26 #include "libavutil/audioconvert.h"
27 #include "libavutil/avstring.h"
28 #include "libavutil/opt.h"
35 typedef struct AFormatContext {
38 AVFilterFormats *formats;
39 AVFilterFormats *sample_rates;
40 AVFilterChannelLayouts *channel_layouts;
43 char *sample_rates_str;
44 char *channel_layouts_str;
47 #define OFFSET(x) offsetof(AFormatContext, x)
48 #define A AV_OPT_FLAG_AUDIO_PARAM
49 static const AVOption options[] = {
50 { "sample_fmts", "A comma-separated list of sample formats.", OFFSET(formats_str), AV_OPT_TYPE_STRING, .flags = A },
51 { "sample_rates", "A comma-separated list of sample rates.", OFFSET(sample_rates_str), AV_OPT_TYPE_STRING, .flags = A },
52 { "channel_layouts", "A comma-separated list of channel layouts.", OFFSET(channel_layouts_str), AV_OPT_TYPE_STRING, .flags = A },
56 static const AVClass aformat_class = {
57 .class_name = "aformat filter",
58 .item_name = av_default_item_name,
60 .version = LIBAVUTIL_VERSION_INT,
63 #define PARSE_FORMATS(str, type, list, add_to_list, get_fmt, none, desc) \
65 char *next, *cur = str; \
68 next = strchr(cur, ','); \
72 if ((fmt = get_fmt(cur)) == none) { \
73 av_log(ctx, AV_LOG_ERROR, "Error parsing " desc ": %s.\n", cur);\
74 ret = AVERROR(EINVAL); \
77 add_to_list(&list, fmt); \
83 static int get_sample_rate(const char *samplerate)
85 int ret = strtol(samplerate, NULL, 0);
89 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
91 AFormatContext *s = ctx->priv;
95 av_log(ctx, AV_LOG_ERROR, "No parameters supplied.\n");
96 return AVERROR(EINVAL);
99 s->class = &aformat_class;
100 av_opt_set_defaults(s);
102 if ((ret = av_set_options_string(s, args, "=", ":")) < 0) {
103 av_log(ctx, AV_LOG_ERROR, "Error parsing options string '%s'.\n", args);
107 PARSE_FORMATS(s->formats_str, enum AVSampleFormat, s->formats,
108 ff_add_format, av_get_sample_fmt, AV_SAMPLE_FMT_NONE, "sample format");
109 PARSE_FORMATS(s->sample_rates_str, int, s->sample_rates, ff_add_format,
110 get_sample_rate, 0, "sample rate");
111 PARSE_FORMATS(s->channel_layouts_str, uint64_t, s->channel_layouts,
112 ff_add_channel_layout, av_get_channel_layout, 0,
120 static int query_formats(AVFilterContext *ctx)
122 AFormatContext *s = ctx->priv;
124 ff_set_common_formats(ctx, s->formats ? s->formats :
125 ff_all_formats(AVMEDIA_TYPE_AUDIO));
126 ff_set_common_samplerates(ctx, s->sample_rates ? s->sample_rates :
127 ff_all_samplerates());
128 ff_set_common_channel_layouts(ctx, s->channel_layouts ? s->channel_layouts :
129 ff_all_channel_layouts());
134 AVFilter avfilter_af_aformat = {
136 .description = NULL_IF_CONFIG_SMALL("Convert the input audio to one of the specified formats."),
138 .query_formats = query_formats,
139 .priv_size = sizeof(AFormatContext),
141 .inputs = (AVFilterPad[]) {{ .name = "default",
142 .type = AVMEDIA_TYPE_AUDIO,
143 .filter_samples = ff_null_filter_samples },
145 .outputs = (AVFilterPad[]) {{ .name = "default",
146 .type = AVMEDIA_TYPE_AUDIO},