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/audioconvert.h"
  27 #include "libavutil/avstring.h"
  28 #include "avfilter.h"
  29 #include "internal.h"
  30
  31 typedef struct {
  32     AVFilterFormats *formats, *chlayouts, *packing;
  33 } AFormatContext;
  34
  35 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
  36 {
  37     AFormatContext * const aformat = ctx->priv;
  38     char *fmts_str = NULL, *fmt_str, *ptr = NULL;
  39     int64_t fmt;
  40     int ret;
  41
  42     if (!args)
  43         goto arg_fail;
  44
  45 #define ADD_FORMATS(all_formats, fmt_name, fmt_type, fmts_list)         \
  46     fmts_str = av_get_token(&args, ":");                                \
  47     if (!fmts_str || !*fmts_str)                                        \
  48         goto arg_fail;                                                  \
  49     if (!strcmp(fmts_str, "all")) {                                     \
  50         aformat->fmts_list = all_formats;                               \
  51     } else {                                                            \
  52         for (fmt_str = fmts_str;                                        \
  53              fmt_str = strtok_r(fmt_str, ",", &ptr); fmt_str = NULL) {  \
  54             if ((ret = ff_parse_##fmt_name((fmt_type *)&fmt,            \
  55                                            fmt_str, ctx)) < 0) {        \
  56                 av_freep(&fmts_str);                                    \
  57                 return ret;                                             \
  58             }                                                           \
  59             avfilter_add_format(&aformat->fmts_list, fmt);              \
  60         }                                                               \
  61     }                                                                   \
  62     av_freep(&fmts_str);                                                \
  63     if (*args)                                                          \
  64         args++;
  65
  66     ADD_FORMATS(avfilter_all_formats(AVMEDIA_TYPE_AUDIO), sample_format, int, formats);
  67     ADD_FORMATS(avfilter_all_channel_layouts(), channel_layout, int64_t, chlayouts);
  68     ADD_FORMATS(avfilter_all_packing_formats(), packing_format, int, packing);
  69
  70     return 0;
  71
  72 arg_fail:
  73     av_log(ctx, AV_LOG_ERROR, "Invalid arguments, they must be of the form "
  74                               "sample_fmts:channel_layouts:packing_fmts\n");
  75     av_freep(&fmts_str);
  76     return AVERROR(EINVAL);
  77 }
  78
  79 static int query_formats(AVFilterContext *ctx)
  80 {
  81     AFormatContext * const aformat = ctx->priv;
  82
  83     avfilter_set_common_sample_formats (ctx, aformat->formats);
  84     avfilter_set_common_channel_layouts(ctx, aformat->chlayouts);
  85     avfilter_set_common_packing_formats(ctx, aformat->packing);
  86     return 0;
  87 }
  88
  89 static void filter_samples(AVFilterLink *inlink, AVFilterBufferRef *insamplesref)
  90 {
  91     avfilter_filter_samples(inlink->dst->outputs[0], insamplesref);
  92 }
  93
  94 AVFilter avfilter_af_aformat = {
  95     .name          = "aformat",
  96     .description   = NULL_IF_CONFIG_SMALL("Convert the input audio to one of the specified formats."),
  97     .init          = init,
  98     .query_formats = query_formats,
  99     .priv_size     = sizeof(AFormatContext),
 100
 101     .inputs        = (AVFilterPad[]) {{ .name            = "default",
 102                                         .type            = AVMEDIA_TYPE_AUDIO,
 103                                         .filter_samples  = filter_samples},
 104                                       { .name = NULL}},
 105     .outputs       = (AVFilterPad[]) {{ .name            = "default",
 106                                         .type            = AVMEDIA_TYPE_AUDIO},
 107                                       { .name = NULL}},
 108 };