ffmpeg/libavfilter/af_aformat.c

   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"
  27 #include "libavutil/channel_layout.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
  39     AVFilterFormats *formats;
  40     AVFilterFormats *sample_rates;
  41     AVFilterChannelLayouts *channel_layouts;
  42
  43     char *formats_str;
  44     char *sample_rates_str;
  45     char *channel_layouts_str;
  46 } AFormatContext;
  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
  97     PARSE_FORMATS(s->formats_str, enum AVSampleFormat, s->formats,
  98                   ff_add_format, av_get_sample_fmt, AV_SAMPLE_FMT_NONE, "sample format");
  99     PARSE_FORMATS(s->sample_rates_str, int, s->sample_rates, ff_add_format,
 100                   get_sample_rate, 0, "sample rate");
 101     PARSE_FORMATS(s->channel_layouts_str, uint64_t, s->channel_layouts,
 102                   ff_add_channel_layout, av_get_channel_layout, 0,
 103                   "channel layout");
 104
 105     return 0;
 106 }
 107
 108 static int query_formats(AVFilterContext *ctx)
 109 {
 110     AFormatContext *s = ctx->priv;
 111
 112     ff_set_common_formats(ctx, s->formats ? s->formats :
 113                                             ff_all_formats(AVMEDIA_TYPE_AUDIO));
 114     ff_set_common_samplerates(ctx, s->sample_rates ? s->sample_rates :
 115                                                      ff_all_samplerates());
 116     ff_set_common_channel_layouts(ctx, s->channel_layouts ? s->channel_layouts :
 117                                                             ff_all_channel_counts());
 118
 119     return 0;
 120 }
 121
 122 static const AVFilterPad avfilter_af_aformat_inputs[] = {
 123     {
 124         .name = "default",
 125         .type = AVMEDIA_TYPE_AUDIO,
 126     },
 127     { NULL }
 128 };
 129
 130 static const AVFilterPad avfilter_af_aformat_outputs[] = {
 131     {
 132         .name = "default",
 133         .type = AVMEDIA_TYPE_AUDIO
 134     },
 135     { NULL }
 136 };
 137
 138 AVFilter ff_af_aformat = {
 139     .name          = "aformat",
 140     .description   = NULL_IF_CONFIG_SMALL("Convert the input audio to one of the specified formats."),
 141     .init          = init,
 142     .query_formats = query_formats,
 143     .priv_size     = sizeof(AFormatContext),
 144     .priv_class    = &aformat_class,
 145     .inputs        = avfilter_af_aformat_inputs,
 146     .outputs       = avfilter_af_aformat_outputs,
 147 };