diff options
author | Anton Khirnov <anton@khirnov.net> | 2012-05-06 11:00:53 +0400 |
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committer | Anton Khirnov <anton@khirnov.net> | 2012-05-14 23:36:11 +0400 |
commit | fb604ae8500d4ee7de6af61387c11618b3dea25b (patch) | |
tree | e7b0a3f698797c26f6335a1be0ed975c9056b22c /libavfilter/af_aformat.c | |
parent | a2cd9be212fca02dd3d6ee65cb6ab9f84c5e28e5 (diff) |
lavfi: add aformat filter
Based on a patch by Mina Nagy Zaki <mnzaki@gmail.com>
Diffstat (limited to 'libavfilter/af_aformat.c')
-rw-r--r-- | libavfilter/af_aformat.c | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/libavfilter/af_aformat.c b/libavfilter/af_aformat.c new file mode 100644 index 0000000000..84442d379e --- /dev/null +++ b/libavfilter/af_aformat.c @@ -0,0 +1,148 @@ +/* + * Copyright (c) 2011 Mina Nagy Zaki + * + * This file is part of Libav. + * + * Libav 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. + * + * Libav 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 Libav; 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/audioconvert.h" +#include "libavutil/avstring.h" +#include "libavutil/opt.h" + +#include "audio.h" +#include "avfilter.h" +#include "formats.h" +#include "internal.h" + +typedef struct AFormatContext { + const AVClass *class; + + AVFilterFormats *formats; + AVFilterFormats *sample_rates; + AVFilterChannelLayouts *channel_layouts; + + char *formats_str; + char *sample_rates_str; + char *channel_layouts_str; +} AFormatContext; + +#define OFFSET(x) offsetof(AFormatContext, x) +#define A AV_OPT_FLAG_AUDIO_PARAM +static const AVOption options[] = { + { "sample_fmts", "A comma-separated list of sample formats.", OFFSET(formats_str), AV_OPT_TYPE_STRING, .flags = A }, + { "sample_rates", "A comma-separated list of sample rates.", OFFSET(sample_rates_str), AV_OPT_TYPE_STRING, .flags = A }, + { "channel_layouts", "A comma-separated list of channel layouts.", OFFSET(channel_layouts_str), AV_OPT_TYPE_STRING, .flags = A }, + { NULL }, +}; + +static const AVClass aformat_class = { + .class_name = "aformat filter", + .item_name = av_default_item_name, + .option = options, + .version = LIBAVUTIL_VERSION_INT, +}; + +#define PARSE_FORMATS(str, type, list, add_to_list, get_fmt, none, desc) \ +do { \ + char *next, *cur = str; \ + while (cur) { \ + type fmt; \ + next = strchr(cur, ','); \ + if (next) \ + *next++ = 0; \ + \ + if ((fmt = get_fmt(cur)) == none) { \ + av_log(ctx, AV_LOG_ERROR, "Error parsing " desc ": %s.\n", cur);\ + ret = AVERROR(EINVAL); \ + goto fail; \ + } \ + add_to_list(&list, fmt); \ + \ + cur = next; \ + } \ +} while (0) + +static int get_sample_rate(const char *samplerate) +{ + int ret = strtol(samplerate, NULL, 0); + return FFMAX(ret, 0); +} + +static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque) +{ + AFormatContext *s = ctx->priv; + int ret; + + if (!args) { + av_log(ctx, AV_LOG_ERROR, "No parameters supplied.\n"); + return AVERROR(EINVAL); + } + + s->class = &aformat_class; + av_opt_set_defaults(s); + + if ((ret = av_set_options_string(s, args, "=", ":")) < 0) { + av_log(ctx, AV_LOG_ERROR, "Error parsing options string '%s'.\n", args); + return ret; + } + + PARSE_FORMATS(s->formats_str, enum AVSampleFormat, s->formats, + avfilter_add_format, av_get_sample_fmt, AV_SAMPLE_FMT_NONE, "sample format"); + PARSE_FORMATS(s->sample_rates_str, int, s->sample_rates, avfilter_add_format, + get_sample_rate, 0, "sample rate"); + PARSE_FORMATS(s->channel_layouts_str, uint64_t, s->channel_layouts, + ff_add_channel_layout, av_get_channel_layout, 0, + "channel layout"); + +fail: + av_opt_free(s); + return ret; +} + +static int query_formats(AVFilterContext *ctx) +{ + AFormatContext *s = ctx->priv; + + avfilter_set_common_formats(ctx, s->formats ? s->formats : + avfilter_all_formats(AVMEDIA_TYPE_AUDIO)); + ff_set_common_samplerates(ctx, s->sample_rates ? s->sample_rates : + ff_all_samplerates()); + ff_set_common_channel_layouts(ctx, s->channel_layouts ? s->channel_layouts : + ff_all_channel_layouts()); + + return 0; +} + +AVFilter avfilter_af_aformat = { + .name = "aformat", + .description = NULL_IF_CONFIG_SMALL("Convert the input audio to one of the specified formats."), + .init = init, + .query_formats = query_formats, + .priv_size = sizeof(AFormatContext), + + .inputs = (AVFilterPad[]) {{ .name = "default", + .type = AVMEDIA_TYPE_AUDIO, + .filter_samples = ff_null_filter_samples }, + { .name = NULL}}, + .outputs = (AVFilterPad[]) {{ .name = "default", + .type = AVMEDIA_TYPE_AUDIO}, + { .name = NULL}}, +}; |