git.sesse.net Git - ffmpeg/blob - 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 '|'-separated list of sample formats.",  OFFSET(formats_str),         AV_OPT_TYPE_STRING, .flags = A|F },
  53     { "f",               "A '|'-separated list of sample formats.",  OFFSET(formats_str),         AV_OPT_TYPE_STRING, .flags = A|F },
  54     { "sample_rates",    "A '|'-separated list of sample rates.",    OFFSET(sample_rates_str),    AV_OPT_TYPE_STRING, .flags = A|F },
  55     { "r",               "A '|'-separated list of sample rates.",    OFFSET(sample_rates_str),    AV_OPT_TYPE_STRING, .flags = A|F },
  56     { "channel_layouts", "A '|'-separated list of channel layouts.", OFFSET(channel_layouts_str), AV_OPT_TYPE_STRING, .flags = A|F },
  57     { "cl",              "A '|'-separated list of channel layouts.", OFFSET(channel_layouts_str), AV_OPT_TYPE_STRING, .flags = A|F },
  58     { NULL }
  59 };
  60
  61 AVFILTER_DEFINE_CLASS(aformat);
  62
  63 #define PARSE_FORMATS(str, type, list, add_to_list, unref_fn, get_fmt, none, desc)    \
  64 do {                                                                        \
  65     char *next, *cur = str, sep;                                            \
  66     int ret;                                                                \
  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         if ((ret = add_to_list(&list, fmt)) < 0) {                          \
  86             unref_fn(&list);                                                \
  87             return ret;                                                     \
  88         }                                                                   \
  89                                                                             \
  90         cur = next;                                                         \
  91     }                                                                       \
  92 } while (0)
  93
  94 static int get_sample_rate(const char *samplerate)
  95 {
  96     int ret = strtol(samplerate, NULL, 0);
  97     return FFMAX(ret, 0);
  98 }
  99
 100 static av_cold int init(AVFilterContext *ctx)
 101 {
 102     AFormatContext *s = ctx->priv;
 103
 104     PARSE_FORMATS(s->formats_str, enum AVSampleFormat, s->formats,
 105                   ff_add_format, ff_formats_unref, av_get_sample_fmt, AV_SAMPLE_FMT_NONE, "sample format");
 106     PARSE_FORMATS(s->sample_rates_str, int, s->sample_rates, ff_add_format, ff_formats_unref,
 107                   get_sample_rate, 0, "sample rate");
 108     PARSE_FORMATS(s->channel_layouts_str, uint64_t, s->channel_layouts,
 109                   ff_add_channel_layout, ff_channel_layouts_unref, av_get_channel_layout, 0,
 110                   "channel layout");
 111
 112     return 0;
 113 }
 114
 115 static int query_formats(AVFilterContext *ctx)
 116 {
 117     AFormatContext *s = ctx->priv;
 118     int ret;
 119
 120     ret = ff_set_common_formats(ctx, s->formats ? s->formats :
 121                                             ff_all_formats(AVMEDIA_TYPE_AUDIO));
 122     if (ret < 0)
 123         return ret;
 124     ret = ff_set_common_samplerates(ctx, s->sample_rates ? s->sample_rates :
 125                                                      ff_all_samplerates());
 126     if (ret < 0)
 127         return ret;
 128     return ff_set_common_channel_layouts(ctx, s->channel_layouts ? s->channel_layouts :
 129                                                             ff_all_channel_counts());
 130 }
 131
 132 static const AVFilterPad avfilter_af_aformat_inputs[] = {
 133     {
 134         .name = "default",
 135         .type = AVMEDIA_TYPE_AUDIO,
 136     },
 137     { NULL }
 138 };
 139
 140 static const AVFilterPad avfilter_af_aformat_outputs[] = {
 141     {
 142         .name = "default",
 143         .type = AVMEDIA_TYPE_AUDIO
 144     },
 145     { NULL }
 146 };
 147
 148 AVFilter ff_af_aformat = {
 149     .name          = "aformat",
 150     .description   = NULL_IF_CONFIG_SMALL("Convert the input audio to one of the specified formats."),
 151     .init          = init,
 152     .query_formats = query_formats,
 153     .priv_size     = sizeof(AFormatContext),
 154     .priv_class    = &aformat_class,
 155     .inputs        = avfilter_af_aformat_inputs,
 156     .outputs       = avfilter_af_aformat_outputs,
 157 };