mirror of https://git.ffmpeg.org/ffmpeg.git
178 lines
6.6 KiB
C
178 lines
6.6 KiB
C
/*
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* Copyright (c) 2011 Mina Nagy Zaki
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* format audio filter
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*/
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#include "libavutil/avstring.h"
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#include "libavutil/channel_layout.h"
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#include "libavutil/common.h"
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#include "libavutil/opt.h"
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#include "audio.h"
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#include "avfilter.h"
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#include "formats.h"
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#include "internal.h"
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typedef struct AFormatContext {
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const AVClass *class;
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AVFilterFormats *formats;
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AVFilterFormats *sample_rates;
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AVFilterChannelLayouts *channel_layouts;
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char *formats_str;
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char *sample_rates_str;
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char *channel_layouts_str;
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} AFormatContext;
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#define OFFSET(x) offsetof(AFormatContext, x)
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#define A AV_OPT_FLAG_AUDIO_PARAM
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#define F AV_OPT_FLAG_FILTERING_PARAM
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static const AVOption aformat_options[] = {
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{ "sample_fmts", "A '|'-separated list of sample formats.", OFFSET(formats_str), AV_OPT_TYPE_STRING, .flags = A|F },
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{ "f", "A '|'-separated list of sample formats.", OFFSET(formats_str), AV_OPT_TYPE_STRING, .flags = A|F },
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{ "sample_rates", "A '|'-separated list of sample rates.", OFFSET(sample_rates_str), AV_OPT_TYPE_STRING, .flags = A|F },
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{ "r", "A '|'-separated list of sample rates.", OFFSET(sample_rates_str), AV_OPT_TYPE_STRING, .flags = A|F },
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{ "channel_layouts", "A '|'-separated list of channel layouts.", OFFSET(channel_layouts_str), AV_OPT_TYPE_STRING, .flags = A|F },
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{ "cl", "A '|'-separated list of channel layouts.", OFFSET(channel_layouts_str), AV_OPT_TYPE_STRING, .flags = A|F },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(aformat);
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#define PARSE_FORMATS(str, type, list, add_to_list, get_fmt, none, desc) \
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do { \
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char *next, *cur = str; \
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int ret; \
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\
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while (cur) { \
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type fmt; \
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next = strchr(cur, '|'); \
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if (next) \
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*next++ = 0; \
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\
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if ((fmt = get_fmt(cur)) == none) { \
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av_log(ctx, AV_LOG_ERROR, "Error parsing " desc ": %s.\n", cur);\
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return AVERROR(EINVAL); \
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} \
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if ((ret = add_to_list(&list, fmt)) < 0) { \
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return ret; \
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} \
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\
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cur = next; \
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} \
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} while (0)
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static int get_sample_rate(const char *samplerate)
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{
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int ret = strtol(samplerate, NULL, 0);
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return FFMAX(ret, 0);
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}
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static int parse_channel_layouts(AVFilterContext *ctx)
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{
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AFormatContext *s = ctx->priv;
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char *next, *cur = s->channel_layouts_str;
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AVChannelLayout fmt = { 0 };
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int ret;
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while (cur) {
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next = strchr(cur, '|');
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if (next)
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*next++ = 0;
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ret = av_channel_layout_from_string(&fmt, cur);
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if (ret < 0) {
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av_log(ctx, AV_LOG_ERROR, "Error parsing channel layout: %s.\n", cur);
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return AVERROR(EINVAL);
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}
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ret = ff_add_channel_layout(&s->channel_layouts, &fmt);
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av_channel_layout_uninit(&fmt);
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if (ret < 0)
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return ret;
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cur = next;
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}
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return 0;
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}
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static av_cold int init(AVFilterContext *ctx)
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{
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AFormatContext *s = ctx->priv;
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int ret;
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PARSE_FORMATS(s->formats_str, enum AVSampleFormat, s->formats,
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ff_add_format, av_get_sample_fmt, AV_SAMPLE_FMT_NONE, "sample format");
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PARSE_FORMATS(s->sample_rates_str, int, s->sample_rates, ff_add_format,
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get_sample_rate, 0, "sample rate");
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ret = parse_channel_layouts(ctx);
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if (ret < 0)
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return ret;
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return 0;
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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AFormatContext *s = ctx->priv;
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ff_formats_unref(&s->formats);
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ff_formats_unref(&s->sample_rates);
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ff_channel_layouts_unref(&s->channel_layouts);
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}
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static int query_formats(AVFilterContext *ctx)
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{
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AFormatContext *s = ctx->priv;
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int ret;
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ret = ff_set_common_formats(ctx, s->formats ? s->formats :
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ff_all_formats(AVMEDIA_TYPE_AUDIO));
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s->formats = NULL;
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if (ret < 0)
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return ret;
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ret = ff_set_common_samplerates(ctx, s->sample_rates ? s->sample_rates :
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ff_all_samplerates());
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s->sample_rates = NULL;
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if (ret < 0)
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return ret;
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ret = ff_set_common_channel_layouts(ctx, s->channel_layouts ? s->channel_layouts :
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ff_all_channel_counts());
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s->channel_layouts = NULL;
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return ret;
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}
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const AVFilter ff_af_aformat = {
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.name = "aformat",
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.description = NULL_IF_CONFIG_SMALL("Convert the input audio to one of the specified formats."),
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.init = init,
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.uninit = uninit,
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.priv_size = sizeof(AFormatContext),
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.priv_class = &aformat_class,
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.flags = AVFILTER_FLAG_METADATA_ONLY,
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FILTER_INPUTS(ff_audio_default_filterpad),
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FILTER_OUTPUTS(ff_audio_default_filterpad),
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FILTER_QUERY_FUNC(query_formats),
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};
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