GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavfilter/af_resample.c Lines: 0 167 0.0 %
Date: 2020-08-14 10:39:37 Branches: 0 110 0.0 %

Line Branch Exec Source
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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/avassert.h"
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#include "libavutil/avstring.h"
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#include "libavutil/common.h"
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#include "libavutil/dict.h"
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#include "libavutil/mathematics.h"
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#include "libavutil/opt.h"
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#include "libavresample/avresample.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 ResampleContext {
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    const AVClass *class;
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    AVAudioResampleContext *avr;
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    AVDictionary *options;
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    int resampling;
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    int64_t next_pts;
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    int64_t next_in_pts;
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    /* set by filter_frame() to signal an output frame to request_frame() */
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    int got_output;
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} ResampleContext;
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static av_cold int init(AVFilterContext *ctx, AVDictionary **opts)
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{
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    ResampleContext *s = ctx->priv;
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    const AVClass *avr_class = avresample_get_class();
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    AVDictionaryEntry *e = NULL;
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    while ((e = av_dict_get(*opts, "", e, AV_DICT_IGNORE_SUFFIX))) {
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        if (av_opt_find(&avr_class, e->key, NULL, 0,
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                        AV_OPT_SEARCH_FAKE_OBJ | AV_OPT_SEARCH_CHILDREN))
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            av_dict_set(&s->options, e->key, e->value, 0);
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    }
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    e = NULL;
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    while ((e = av_dict_get(s->options, "", e, AV_DICT_IGNORE_SUFFIX)))
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        av_dict_set(opts, e->key, NULL, 0);
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    /* do not allow the user to override basic format options */
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    av_dict_set(&s->options,  "in_channel_layout", NULL, 0);
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    av_dict_set(&s->options, "out_channel_layout", NULL, 0);
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    av_dict_set(&s->options,  "in_sample_fmt",     NULL, 0);
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    av_dict_set(&s->options, "out_sample_fmt",     NULL, 0);
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    av_dict_set(&s->options,  "in_sample_rate",    NULL, 0);
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    av_dict_set(&s->options, "out_sample_rate",    NULL, 0);
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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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    ResampleContext *s = ctx->priv;
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    if (s->avr) {
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        avresample_close(s->avr);
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        avresample_free(&s->avr);
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    }
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    av_dict_free(&s->options);
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}
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static int query_formats(AVFilterContext *ctx)
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{
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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, *out_formats, *in_samplerates, *out_samplerates;
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    AVFilterChannelLayouts *in_layouts, *out_layouts;
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    int ret;
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    if (!(in_formats      = ff_all_formats         (AVMEDIA_TYPE_AUDIO)) ||
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        !(out_formats     = ff_all_formats         (AVMEDIA_TYPE_AUDIO)) ||
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        !(in_samplerates  = ff_all_samplerates     (                  )) ||
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        !(out_samplerates = ff_all_samplerates     (                  )) ||
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        !(in_layouts      = ff_all_channel_layouts (                  )) ||
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        !(out_layouts     = ff_all_channel_layouts (                  )))
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        return AVERROR(ENOMEM);
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    if ((ret = ff_formats_ref         (in_formats,      &inlink->out_formats        )) < 0 ||
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        (ret = ff_formats_ref         (out_formats,     &outlink->in_formats        )) < 0 ||
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        (ret = ff_formats_ref         (in_samplerates,  &inlink->out_samplerates    )) < 0 ||
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        (ret = ff_formats_ref         (out_samplerates, &outlink->in_samplerates    )) < 0 ||
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        (ret = ff_channel_layouts_ref (in_layouts,      &inlink->out_channel_layouts)) < 0 ||
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        (ret = ff_channel_layouts_ref (out_layouts,     &outlink->in_channel_layouts)) < 0)
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        return ret;
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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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    AVFilterContext *ctx = outlink->src;
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    AVFilterLink *inlink = ctx->inputs[0];
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    ResampleContext   *s = ctx->priv;
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    char buf1[64], buf2[64];
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    int ret;
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    int64_t resampling_forced;
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    if (s->avr) {
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        avresample_close(s->avr);
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        avresample_free(&s->avr);
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    }
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    if (inlink->channel_layout == outlink->channel_layout &&
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        inlink->sample_rate    == outlink->sample_rate    &&
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        (inlink->format        == outlink->format ||
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        (av_get_channel_layout_nb_channels(inlink->channel_layout)  == 1 &&
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         av_get_channel_layout_nb_channels(outlink->channel_layout) == 1 &&
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         av_get_planar_sample_fmt(inlink->format) ==
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         av_get_planar_sample_fmt(outlink->format))))
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        return 0;
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    if (!(s->avr = avresample_alloc_context()))
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        return AVERROR(ENOMEM);
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    if (s->options) {
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        int ret;
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        AVDictionaryEntry *e = NULL;
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        while ((e = av_dict_get(s->options, "", e, AV_DICT_IGNORE_SUFFIX)))
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            av_log(ctx, AV_LOG_VERBOSE, "lavr option: %s=%s\n", e->key, e->value);
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        ret = av_opt_set_dict(s->avr, &s->options);
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        if (ret < 0)
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            return ret;
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    }
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    av_opt_set_int(s->avr,  "in_channel_layout", inlink ->channel_layout, 0);
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    av_opt_set_int(s->avr, "out_channel_layout", outlink->channel_layout, 0);
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    av_opt_set_int(s->avr,  "in_sample_fmt",     inlink ->format,         0);
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    av_opt_set_int(s->avr, "out_sample_fmt",     outlink->format,         0);
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    av_opt_set_int(s->avr,  "in_sample_rate",    inlink ->sample_rate,    0);
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    av_opt_set_int(s->avr, "out_sample_rate",    outlink->sample_rate,    0);
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    if ((ret = avresample_open(s->avr)) < 0)
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        return ret;
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    av_opt_get_int(s->avr, "force_resampling", 0, &resampling_forced);
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    s->resampling = resampling_forced || (inlink->sample_rate != outlink->sample_rate);
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    if (s->resampling) {
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        outlink->time_base = (AVRational){ 1, outlink->sample_rate };
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        s->next_pts        = AV_NOPTS_VALUE;
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        s->next_in_pts     = AV_NOPTS_VALUE;
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    } else
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        outlink->time_base = inlink->time_base;
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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 srate:%d cl:%s -> fmt:%s srate:%d cl:%s\n",
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           av_get_sample_fmt_name(inlink ->format), inlink ->sample_rate, buf1,
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           av_get_sample_fmt_name(outlink->format), outlink->sample_rate, buf2);
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    return 0;
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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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    ResampleContext   *s = ctx->priv;
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    int ret = 0;
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    s->got_output = 0;
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    while (ret >= 0 && !s->got_output)
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        ret = ff_request_frame(ctx->inputs[0]);
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    /* flush the lavr delay buffer */
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    if (ret == AVERROR_EOF && s->avr) {
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        AVFrame *frame;
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        int nb_samples = avresample_get_out_samples(s->avr, 0);
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        if (!nb_samples)
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            return ret;
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        frame = ff_get_audio_buffer(outlink, nb_samples);
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        if (!frame)
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            return AVERROR(ENOMEM);
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        ret = avresample_convert(s->avr, frame->extended_data,
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                                 frame->linesize[0], nb_samples,
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                                 NULL, 0, 0);
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        if (ret <= 0) {
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            av_frame_free(&frame);
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            return (ret == 0) ? AVERROR_EOF : ret;
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        }
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        frame->nb_samples = ret;
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        frame->pts = s->next_pts;
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        return ff_filter_frame(outlink, frame);
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    }
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    return ret;
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}
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static int filter_frame(AVFilterLink *inlink, AVFrame *in)
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{
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    AVFilterContext  *ctx = inlink->dst;
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    ResampleContext    *s = ctx->priv;
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    AVFilterLink *outlink = ctx->outputs[0];
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    int ret;
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    if (s->avr) {
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        AVFrame *out;
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        int delay, nb_samples;
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        /* maximum possible samples lavr can output */
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        delay      = avresample_get_delay(s->avr);
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        nb_samples = avresample_get_out_samples(s->avr, in->nb_samples);
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        out = ff_get_audio_buffer(outlink, nb_samples);
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        if (!out) {
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            ret = AVERROR(ENOMEM);
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            goto fail;
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        }
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        ret = avresample_convert(s->avr, out->extended_data, out->linesize[0],
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                                 nb_samples, in->extended_data, in->linesize[0],
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                                 in->nb_samples);
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        if (ret <= 0) {
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            av_frame_free(&out);
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            if (ret < 0)
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                goto fail;
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        }
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        av_assert0(!avresample_available(s->avr));
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        if (s->resampling && s->next_pts == AV_NOPTS_VALUE) {
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            if (in->pts == AV_NOPTS_VALUE) {
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                av_log(ctx, AV_LOG_WARNING, "First timestamp is missing, "
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                       "assuming 0.\n");
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                s->next_pts = 0;
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            } else
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                s->next_pts = av_rescale_q(in->pts, inlink->time_base,
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                                           outlink->time_base);
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        }
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        if (ret > 0) {
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            out->nb_samples = ret;
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            ret = av_frame_copy_props(out, in);
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            if (ret < 0) {
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                av_frame_free(&out);
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                goto fail;
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            }
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            if (s->resampling) {
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                out->sample_rate = outlink->sample_rate;
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                /* Only convert in->pts if there is a discontinuous jump.
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                   This ensures that out->pts tracks the number of samples actually
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                   output by the resampler in the absence of such a jump.
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                   Otherwise, the rounding in av_rescale_q() and av_rescale()
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                   causes off-by-1 errors. */
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                if (in->pts != AV_NOPTS_VALUE && in->pts != s->next_in_pts) {
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                    out->pts = av_rescale_q(in->pts, inlink->time_base,
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                                                outlink->time_base) -
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                                   av_rescale(delay, outlink->sample_rate,
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                                              inlink->sample_rate);
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                } else
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                    out->pts = s->next_pts;
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                s->next_pts = out->pts + out->nb_samples;
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                s->next_in_pts = in->pts + in->nb_samples;
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            } else
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                out->pts = in->pts;
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            ret = ff_filter_frame(outlink, out);
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            s->got_output = 1;
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        }
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fail:
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        av_frame_free(&in);
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    } else {
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        in->format = outlink->format;
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        ret = ff_filter_frame(outlink, in);
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        s->got_output = 1;
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    }
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    return ret;
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}
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#if FF_API_CHILD_CLASS_NEXT
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static const AVClass *resample_child_class_next(const AVClass *prev)
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{
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    return prev ? NULL : avresample_get_class();
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}
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#endif
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static const AVClass *resample_child_class_iterate(void **iter)
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{
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    const AVClass *c = *iter ? NULL : avresample_get_class();
319
    *iter = (void*)(uintptr_t)c;
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    return c;
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}
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static void *resample_child_next(void *obj, void *prev)
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{
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    ResampleContext *s = obj;
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    return prev ? NULL : s->avr;
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}
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static const AVClass resample_class = {
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    .class_name       = "resample",
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    .item_name        = av_default_item_name,
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    .version          = LIBAVUTIL_VERSION_INT,
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#if FF_API_CHILD_CLASS_NEXT
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    .child_class_next = resample_child_class_next,
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#endif
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    .child_class_iterate = resample_child_class_iterate,
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    .child_next       = resample_child_next,
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};
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static const AVFilterPad avfilter_af_resample_inputs[] = {
341
    {
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        .name          = "default",
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        .type          = AVMEDIA_TYPE_AUDIO,
344
        .filter_frame  = filter_frame,
345
    },
346
    { NULL }
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};
348
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static const AVFilterPad avfilter_af_resample_outputs[] = {
350
    {
351
        .name          = "default",
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        .type          = AVMEDIA_TYPE_AUDIO,
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        .config_props  = config_output,
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        .request_frame = request_frame
355
    },
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    { NULL }
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};
358
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AVFilter ff_af_resample = {
360
    .name          = "resample",
361
    .description   = NULL_IF_CONFIG_SMALL("Audio resampling and conversion."),
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    .priv_size     = sizeof(ResampleContext),
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    .priv_class    = &resample_class,
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    .init_dict     = init,
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    .uninit        = uninit,
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    .query_formats = query_formats,
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    .inputs        = avfilter_af_resample_inputs,
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    .outputs       = avfilter_af_resample_outputs,
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};