mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-08-27 11:51:49 +02:00
187 lines
6.1 KiB
C
187 lines
6.1 KiB
C
/*
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* Copyright (c) 2010 S.N. Hemanth Meenakshisundaram <smeenaks@ucsd.edu>
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* Copyright (c) 2011 Stefano Sabatini
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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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* sample format and channel layout conversion 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 "libswresample/swresample.h"
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#include "avfilter.h"
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#include "audio.h"
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#include "internal.h"
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typedef struct {
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enum AVSampleFormat out_sample_fmt;
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int64_t out_chlayout;
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struct SwrContext *swr;
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} AConvertContext;
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static av_cold int init(AVFilterContext *ctx, const char *args0)
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{
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AConvertContext *aconvert = ctx->priv;
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char *arg, *ptr = NULL;
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int ret = 0;
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char *args = av_strdup(args0);
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aconvert->out_sample_fmt = AV_SAMPLE_FMT_NONE;
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aconvert->out_chlayout = 0;
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if ((arg = av_strtok(args, ":", &ptr)) && strcmp(arg, "auto")) {
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if ((ret = ff_parse_sample_format(&aconvert->out_sample_fmt, arg, ctx)) < 0)
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goto end;
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}
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if ((arg = av_strtok(NULL, ":", &ptr)) && strcmp(arg, "auto")) {
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if ((ret = ff_parse_channel_layout(&aconvert->out_chlayout, arg, ctx)) < 0)
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goto end;
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}
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end:
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av_freep(&args);
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return ret;
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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AConvertContext *aconvert = ctx->priv;
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swr_free(&aconvert->swr);
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}
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static int query_formats(AVFilterContext *ctx)
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{
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AVFilterFormats *formats = NULL;
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AConvertContext *aconvert = ctx->priv;
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AVFilterLink *inlink = ctx->inputs[0];
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AVFilterLink *outlink = ctx->outputs[0];
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AVFilterChannelLayouts *layouts;
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ff_formats_ref(ff_all_formats(AVMEDIA_TYPE_AUDIO),
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&inlink->out_formats);
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if (aconvert->out_sample_fmt != AV_SAMPLE_FMT_NONE) {
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formats = NULL;
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ff_add_format(&formats, aconvert->out_sample_fmt);
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ff_formats_ref(formats, &outlink->in_formats);
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} else
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ff_formats_ref(ff_all_formats(AVMEDIA_TYPE_AUDIO),
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&outlink->in_formats);
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ff_channel_layouts_ref(ff_all_channel_layouts(),
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&inlink->out_channel_layouts);
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if (aconvert->out_chlayout != 0) {
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layouts = NULL;
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ff_add_channel_layout(&layouts, aconvert->out_chlayout);
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ff_channel_layouts_ref(layouts, &outlink->in_channel_layouts);
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} else
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ff_channel_layouts_ref(ff_all_channel_layouts(),
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&outlink->in_channel_layouts);
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return 0;
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}
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static int config_output(AVFilterLink *outlink)
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{
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int ret;
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AVFilterContext *ctx = outlink->src;
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AVFilterLink *inlink = ctx->inputs[0];
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AConvertContext *aconvert = ctx->priv;
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char buf1[64], buf2[64];
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/* if not specified in args, use the format and layout of the output */
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if (aconvert->out_sample_fmt == AV_SAMPLE_FMT_NONE)
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aconvert->out_sample_fmt = outlink->format;
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if (aconvert->out_chlayout == 0)
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aconvert->out_chlayout = outlink->channel_layout;
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aconvert->swr = swr_alloc_set_opts(aconvert->swr,
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aconvert->out_chlayout, aconvert->out_sample_fmt, inlink->sample_rate,
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inlink->channel_layout, inlink->format, inlink->sample_rate,
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0, ctx);
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if (!aconvert->swr)
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return AVERROR(ENOMEM);
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ret = swr_init(aconvert->swr);
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if (ret < 0)
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return ret;
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av_get_channel_layout_string(buf1, sizeof(buf1),
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-1, inlink ->channel_layout);
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av_get_channel_layout_string(buf2, sizeof(buf2),
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-1, outlink->channel_layout);
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av_log(ctx, AV_LOG_VERBOSE,
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"fmt:%s cl:%s -> fmt:%s cl:%s\n",
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av_get_sample_fmt_name(inlink ->format), buf1,
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av_get_sample_fmt_name(outlink->format), buf2);
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return 0;
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}
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static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *insamplesref)
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{
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AConvertContext *aconvert = inlink->dst->priv;
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const int n = insamplesref->audio->nb_samples;
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AVFilterLink *const outlink = inlink->dst->outputs[0];
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AVFilterBufferRef *outsamplesref = ff_get_audio_buffer(outlink, AV_PERM_WRITE, n);
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int ret;
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swr_convert(aconvert->swr, outsamplesref->data, n,
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(void *)insamplesref->data, n);
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avfilter_copy_buffer_ref_props(outsamplesref, insamplesref);
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outsamplesref->audio->channels = outlink->channels;
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outsamplesref->audio->channel_layout = outlink->channel_layout;
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ret = ff_filter_frame(outlink, outsamplesref);
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avfilter_unref_buffer(insamplesref);
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return ret;
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}
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static const AVFilterPad aconvert_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_AUDIO,
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.filter_frame = filter_frame,
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.min_perms = AV_PERM_READ,
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},
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{ NULL }
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};
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static const AVFilterPad aconvert_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_AUDIO,
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.config_props = config_output,
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},
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{ NULL }
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};
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AVFilter avfilter_af_aconvert = {
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.name = "aconvert",
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.description = NULL_IF_CONFIG_SMALL("Convert the input audio to sample_fmt:channel_layout."),
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.priv_size = sizeof(AConvertContext),
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.init = init,
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.uninit = uninit,
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.query_formats = query_formats,
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.inputs = aconvert_inputs,
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.outputs = aconvert_outputs,
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};
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