/* * Copyright (c) 2011 Mina Nagy Zaki * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * format audio filter */ #include "libavutil/avstring.h"#include "libavutil/channel_layout.h"#include "libavutil/common.h"#include "libavutil/mem.h"#include "libavutil/opt.h" #include "audio.h"#include "avfilter.h"#include "filters.h"#include "formats.h" typedef struct AFormatContext {    const AVClass   *class;     enum AVSampleFormat *formats;    unsigned          nb_formats;     int                 *sample_rates;    unsigned          nb_sample_rates;     AVChannelLayout     *channel_layouts;    unsigned          nb_channel_layouts;} AFormatContext; static const AVOptionArrayDef array_def = { .sep = '|' }; #define OFFSET(x) offsetof(AFormatContext, x)#define A AV_OPT_FLAG_AUDIO_PARAM#define F AV_OPT_FLAG_FILTERING_PARAMstatic const AVOption aformat_options[] = {    { "sample_fmts",     "A '|'-separated list of sample formats.",  OFFSET(formats),        AV_OPT_TYPE_SAMPLE_FMT | AV_OPT_TYPE_FLAG_ARRAY, .default_val.arr = &array_def, .flags = A|F },    { "f",               "A '|'-separated list of sample formats.",  OFFSET(formats),        AV_OPT_TYPE_SAMPLE_FMT | AV_OPT_TYPE_FLAG_ARRAY, .default_val.arr = &array_def, .flags = A|F },    { "sample_rates",    "A '|'-separated list of sample rates.",    OFFSET(sample_rates),        AV_OPT_TYPE_INT | AV_OPT_TYPE_FLAG_ARRAY, .default_val.arr = &array_def, .min = 1, .max = INT_MAX, .flags = A|F },    { "r",               "A '|'-separated list of sample rates.",    OFFSET(sample_rates),        AV_OPT_TYPE_INT | AV_OPT_TYPE_FLAG_ARRAY, .default_val.arr = &array_def, .min = 1, .max = INT_MAX, .flags = A|F },    { "channel_layouts", "A '|'-separated list of channel layouts.", OFFSET(channel_layouts),        AV_OPT_TYPE_CHLAYOUT | AV_OPT_TYPE_FLAG_ARRAY, .default_val.arr = &array_def, .flags = A|F },    { "cl",              "A '|'-separated list of channel layouts.", OFFSET(channel_layouts),        AV_OPT_TYPE_CHLAYOUT | AV_OPT_TYPE_FLAG_ARRAY, .default_val.arr = &array_def, .flags = A|F },    { NULL }}; AVFILTER_DEFINE_CLASS(aformat); static av_cold int init(AVFilterContext *ctx){    AFormatContext *s = ctx->priv;     // terminate format lists for ff_set*_from_list()    if (s->nb_formats) {        void *tmp = av_realloc_array(s->formats, s->nb_formats + 1,                                     sizeof(*s->formats));        if (!tmp)            return AVERROR(ENOMEM);        s->formats = tmp;        s->formats[s->nb_formats] = AV_SAMPLE_FMT_NONE;     }    if (s->nb_sample_rates) {        void *tmp = av_realloc_array(s->sample_rates, s->nb_sample_rates + 1,                                     sizeof(*s->sample_rates));        if (!tmp)            return AVERROR(ENOMEM);        s->sample_rates = tmp;        s->sample_rates[s->nb_sample_rates] = -1;    }    if (s->nb_channel_layouts) {        void *tmp = av_realloc_array(s->channel_layouts, s->nb_channel_layouts + 1,                                     sizeof(*s->channel_layouts));        if (!tmp)            return AVERROR(ENOMEM);        s->channel_layouts = tmp;        s->channel_layouts[s->nb_channel_layouts] = (AVChannelLayout){ .nb_channels = 0 };    }     return 0;} static int query_formats(const AVFilterContext *ctx,                         AVFilterFormatsConfig **cfg_in,                         AVFilterFormatsConfig **cfg_out){    const AFormatContext *s = ctx->priv;    int ret;     if (s->nb_formats) {        ret = ff_set_common_formats_from_list2(ctx, cfg_in, cfg_out, s->formats);        if (ret < 0)            return ret;    }     if (s->nb_sample_rates) {        ret = ff_set_common_samplerates_from_list2(ctx, cfg_in, cfg_out, s->sample_rates);        if (ret < 0)            return ret;    }     if (s->nb_channel_layouts) {        ret = ff_set_common_channel_layouts_from_list2(ctx, cfg_in, cfg_out, s->channel_layouts);        if (ret < 0)            return ret;    }     return 0;} const FFFilter ff_af_aformat = {    .p.name        = "aformat",    .p.description = NULL_IF_CONFIG_SMALL("Convert the input audio to one of the specified formats."),    .p.priv_class  = &aformat_class,    .p.flags       = AVFILTER_FLAG_METADATA_ONLY,    .init          = init,    .priv_size     = sizeof(AFormatContext),    FILTER_INPUTS(ff_audio_default_filterpad),    FILTER_OUTPUTS(ff_audio_default_filterpad),    FILTER_QUERY_FUNC2(query_formats),};