mirror of
https://github.com/FFmpeg/FFmpeg.git
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e06c147581
Improve overall consistency/improve readability.
287 lines
9.5 KiB
C
287 lines
9.5 KiB
C
/*
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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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* resampling 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/opt.h"
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#include "libavutil/samplefmt.h"
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#include "libavutil/avassert.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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double ratio;
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struct SwrContext *swr;
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int64_t next_pts;
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int req_fullfilled;
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} AResampleContext;
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static av_cold int init(AVFilterContext *ctx, const char *args)
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{
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AResampleContext *aresample = ctx->priv;
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int ret = 0;
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char *argd = av_strdup(args);
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aresample->next_pts = AV_NOPTS_VALUE;
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aresample->swr = swr_alloc();
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if (!aresample->swr) {
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ret = AVERROR(ENOMEM);
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goto end;
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}
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if (args) {
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char *ptr = argd, *token;
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while (token = av_strtok(ptr, ":", &ptr)) {
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char *value;
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av_strtok(token, "=", &value);
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if (value) {
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if ((ret = av_opt_set(aresample->swr, token, value, 0)) < 0)
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goto end;
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} else {
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int out_rate;
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if ((ret = ff_parse_sample_rate(&out_rate, token, ctx)) < 0)
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goto end;
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if ((ret = av_opt_set_int(aresample->swr, "osr", out_rate, 0)) < 0)
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goto end;
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}
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}
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}
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end:
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av_free(argd);
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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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AResampleContext *aresample = ctx->priv;
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swr_free(&aresample->swr);
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}
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static int query_formats(AVFilterContext *ctx)
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{
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AResampleContext *aresample = ctx->priv;
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int out_rate = av_get_int(aresample->swr, "osr", NULL);
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uint64_t out_layout = av_get_int(aresample->swr, "ocl", NULL);
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enum AVSampleFormat out_format = av_get_int(aresample->swr, "osf", NULL);
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AVFilterLink *inlink = ctx->inputs[0];
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AVFilterLink *outlink = ctx->outputs[0];
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AVFilterFormats *in_formats = ff_all_formats(AVMEDIA_TYPE_AUDIO);
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AVFilterFormats *out_formats;
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AVFilterFormats *in_samplerates = ff_all_samplerates();
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AVFilterFormats *out_samplerates;
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AVFilterChannelLayouts *in_layouts = ff_all_channel_layouts();
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AVFilterChannelLayouts *out_layouts;
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ff_formats_ref (in_formats, &inlink->out_formats);
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ff_formats_ref (in_samplerates, &inlink->out_samplerates);
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ff_channel_layouts_ref(in_layouts, &inlink->out_channel_layouts);
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if(out_rate > 0) {
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out_samplerates = ff_make_format_list((int[]){ out_rate, -1 });
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} else {
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out_samplerates = ff_all_samplerates();
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}
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ff_formats_ref(out_samplerates, &outlink->in_samplerates);
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if(out_format != AV_SAMPLE_FMT_NONE) {
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out_formats = ff_make_format_list((int[]){ out_format, -1 });
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} else
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out_formats = ff_all_formats(AVMEDIA_TYPE_AUDIO);
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ff_formats_ref(out_formats, &outlink->in_formats);
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if(out_layout) {
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out_layouts = avfilter_make_format64_list((int64_t[]){ out_layout, -1 });
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} else
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out_layouts = ff_all_channel_layouts();
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ff_channel_layouts_ref(out_layouts, &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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AResampleContext *aresample = ctx->priv;
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int out_rate;
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uint64_t out_layout;
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enum AVSampleFormat out_format;
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char inchl_buf[128], outchl_buf[128];
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aresample->swr = swr_alloc_set_opts(aresample->swr,
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outlink->channel_layout, outlink->format, outlink->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 (!aresample->swr)
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return AVERROR(ENOMEM);
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ret = swr_init(aresample->swr);
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if (ret < 0)
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return ret;
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out_rate = av_get_int(aresample->swr, "osr", NULL);
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out_layout = av_get_int(aresample->swr, "ocl", NULL);
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out_format = av_get_int(aresample->swr, "osf", NULL);
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outlink->time_base = (AVRational) {1, out_rate};
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av_assert0(outlink->sample_rate == out_rate);
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av_assert0(outlink->channel_layout == out_layout);
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av_assert0(outlink->format == out_format);
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aresample->ratio = (double)outlink->sample_rate / inlink->sample_rate;
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av_get_channel_layout_string(inchl_buf, sizeof(inchl_buf), -1, inlink ->channel_layout);
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av_get_channel_layout_string(outchl_buf, sizeof(outchl_buf), -1, outlink->channel_layout);
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av_log(ctx, AV_LOG_VERBOSE, "chl:%s fmt:%s r:%dHz -> chl:%s fmt:%s r:%dHz\n",
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inchl_buf, av_get_sample_fmt_name(inlink->format), inlink->sample_rate,
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outchl_buf, av_get_sample_fmt_name(outlink->format), outlink->sample_rate);
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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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AResampleContext *aresample = inlink->dst->priv;
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const int n_in = insamplesref->audio->nb_samples;
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int n_out = n_in * aresample->ratio * 2 + 256;
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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_out);
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int ret;
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if(!outsamplesref)
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return AVERROR(ENOMEM);
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avfilter_copy_buffer_ref_props(outsamplesref, insamplesref);
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outsamplesref->format = outlink->format;
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outsamplesref->audio->channels = outlink->channels;
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outsamplesref->audio->channel_layout = outlink->channel_layout;
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outsamplesref->audio->sample_rate = outlink->sample_rate;
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if(insamplesref->pts != AV_NOPTS_VALUE) {
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int64_t inpts = av_rescale(insamplesref->pts, inlink->time_base.num * (int64_t)outlink->sample_rate * inlink->sample_rate, inlink->time_base.den);
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int64_t outpts= swr_next_pts(aresample->swr, inpts);
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aresample->next_pts =
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outsamplesref->pts = ROUNDED_DIV(outpts, inlink->sample_rate);
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} else {
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outsamplesref->pts = AV_NOPTS_VALUE;
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}
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n_out = swr_convert(aresample->swr, outsamplesref->extended_data, n_out,
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(void *)insamplesref->extended_data, n_in);
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if (n_out <= 0) {
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avfilter_unref_buffer(outsamplesref);
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avfilter_unref_buffer(insamplesref);
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return 0;
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}
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outsamplesref->audio->nb_samples = n_out;
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ret = ff_filter_frame(outlink, outsamplesref);
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aresample->req_fullfilled= 1;
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avfilter_unref_buffer(insamplesref);
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return ret;
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}
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static int request_frame(AVFilterLink *outlink)
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{
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AVFilterContext *ctx = outlink->src;
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AResampleContext *aresample = ctx->priv;
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AVFilterLink *const inlink = outlink->src->inputs[0];
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int ret;
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aresample->req_fullfilled = 0;
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do{
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ret = ff_request_frame(ctx->inputs[0]);
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}while(!aresample->req_fullfilled && ret>=0);
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if (ret == AVERROR_EOF) {
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AVFilterBufferRef *outsamplesref;
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int n_out = 4096;
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outsamplesref = ff_get_audio_buffer(outlink, AV_PERM_WRITE, n_out);
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if (!outsamplesref)
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return AVERROR(ENOMEM);
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n_out = swr_convert(aresample->swr, outsamplesref->extended_data, n_out, 0, 0);
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if (n_out <= 0) {
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avfilter_unref_buffer(outsamplesref);
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return (n_out == 0) ? AVERROR_EOF : n_out;
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}
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outsamplesref->audio->sample_rate = outlink->sample_rate;
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outsamplesref->audio->nb_samples = n_out;
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#if 0
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outsamplesref->pts = aresample->next_pts;
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if(aresample->next_pts != AV_NOPTS_VALUE)
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aresample->next_pts += av_rescale_q(n_out, (AVRational){1 ,outlink->sample_rate}, outlink->time_base);
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#else
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outsamplesref->pts = swr_next_pts(aresample->swr, INT64_MIN);
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outsamplesref->pts = ROUNDED_DIV(outsamplesref->pts, inlink->sample_rate);
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#endif
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ff_filter_frame(outlink, outsamplesref);
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return 0;
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}
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return ret;
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}
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static const AVFilterPad aresample_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 aresample_outputs[] = {
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{
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.name = "default",
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.config_props = config_output,
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.request_frame = request_frame,
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.type = AVMEDIA_TYPE_AUDIO,
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},
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{ NULL },
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};
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AVFilter avfilter_af_aresample = {
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.name = "aresample",
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.description = NULL_IF_CONFIG_SMALL("Resample audio data."),
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.init = init,
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.uninit = uninit,
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.query_formats = query_formats,
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.priv_size = sizeof(AResampleContext),
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.inputs = aresample_inputs,
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.outputs = aresample_outputs,
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};
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