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b4f5201967
If one looks at the many query_formats callbacks in existence, one will immediately recognize that there is one type of default callback for video and a slightly different default callback for audio: It is "return ff_set_common_formats_from_list(ctx, pix_fmts);" for video with a filter-specific pix_fmts list. For audio, it is the same with a filter-specific sample_fmts list together with ff_set_common_all_samplerates() and ff_set_common_all_channel_counts(). This commit allows to remove the boilerplate query_formats callbacks by replacing said callback with a union consisting the old callback and pointers for pixel and sample format arrays. For the not uncommon case in which these lists only contain a single entry (besides the sentinel) enum AVPixelFormat and enum AVSampleFormat fields are also added to the union to store them directly in the AVFilter, thereby avoiding a relocation. The state of said union will be contained in a new, dedicated AVFilter field (the nb_inputs and nb_outputs fields have been shrunk to uint8_t in order to create a hole for this new field; this is no problem, as the maximum of all the nb_inputs is four; for nb_outputs it is only two). The state's default value coincides with the earlier default of query_formats being unset, namely that the filter accepts all formats (and also sample rates and channel counts/layouts for audio) provided that these properties agree coincide for all inputs and outputs. By using different union members for audio and video filters the type-unsafety of using the same functions for audio and video lists will furthermore be more confined to formats.c than before. When the new fields are used, they will also avoid allocations: Currently something nearly equivalent to ff_default_query_formats() is called after every successful call to a query_formats callback; yet in the common case that the newly allocated AVFilterFormats are not used at all (namely if there are no free links) these newly allocated AVFilterFormats are freed again without ever being used. Filters no longer using the callback will not exhibit this any more. Reviewed-by: Paul B Mahol <onemda@gmail.com> Reviewed-by: Nicolas George <george@nsup.org> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
275 lines
9.1 KiB
C
275 lines
9.1 KiB
C
/*
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* Copyright (c) 2013 Nicolas George
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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 License
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* 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
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* GNU 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 License
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* along with FFmpeg; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <float.h>
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#include "libavutil/avassert.h"
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#include "libavutil/channel_layout.h"
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#include "libavutil/eval.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 "filters.h"
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#include "internal.h"
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typedef struct SineContext {
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const AVClass *class;
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double frequency;
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double beep_factor;
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char *samples_per_frame;
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AVExpr *samples_per_frame_expr;
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int sample_rate;
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int64_t duration;
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int16_t *sin;
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int64_t pts;
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uint32_t phi; ///< current phase of the sine (2pi = 1<<32)
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uint32_t dphi; ///< phase increment between two samples
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unsigned beep_period;
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unsigned beep_index;
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unsigned beep_length;
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uint32_t phi_beep; ///< current phase of the beep
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uint32_t dphi_beep; ///< phase increment of the beep
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} SineContext;
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#define CONTEXT SineContext
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#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
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#define OPT_GENERIC(name, field, def, min, max, descr, type, deffield, ...) \
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{ name, descr, offsetof(CONTEXT, field), AV_OPT_TYPE_ ## type, \
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{ .deffield = def }, min, max, FLAGS, __VA_ARGS__ }
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#define OPT_INT(name, field, def, min, max, descr, ...) \
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OPT_GENERIC(name, field, def, min, max, descr, INT, i64, __VA_ARGS__)
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#define OPT_DBL(name, field, def, min, max, descr, ...) \
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OPT_GENERIC(name, field, def, min, max, descr, DOUBLE, dbl, __VA_ARGS__)
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#define OPT_DUR(name, field, def, min, max, descr, ...) \
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OPT_GENERIC(name, field, def, min, max, descr, DURATION, str, __VA_ARGS__)
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#define OPT_STR(name, field, def, min, max, descr, ...) \
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OPT_GENERIC(name, field, def, min, max, descr, STRING, str, __VA_ARGS__)
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static const AVOption sine_options[] = {
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OPT_DBL("frequency", frequency, 440, 0, DBL_MAX, "set the sine frequency",),
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OPT_DBL("f", frequency, 440, 0, DBL_MAX, "set the sine frequency",),
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OPT_DBL("beep_factor", beep_factor, 0, 0, DBL_MAX, "set the beep frequency factor",),
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OPT_DBL("b", beep_factor, 0, 0, DBL_MAX, "set the beep frequency factor",),
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OPT_INT("sample_rate", sample_rate, 44100, 1, INT_MAX, "set the sample rate",),
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OPT_INT("r", sample_rate, 44100, 1, INT_MAX, "set the sample rate",),
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OPT_DUR("duration", duration, 0, 0, INT64_MAX, "set the audio duration",),
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OPT_DUR("d", duration, 0, 0, INT64_MAX, "set the audio duration",),
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OPT_STR("samples_per_frame", samples_per_frame, "1024", 0, 0, "set the number of samples per frame",),
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{NULL}
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};
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AVFILTER_DEFINE_CLASS(sine);
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#define LOG_PERIOD 15
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#define AMPLITUDE 4095
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#define AMPLITUDE_SHIFT 3
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static void make_sin_table(int16_t *sin)
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{
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unsigned half_pi = 1 << (LOG_PERIOD - 2);
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unsigned ampls = AMPLITUDE << AMPLITUDE_SHIFT;
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uint64_t unit2 = (uint64_t)(ampls * ampls) << 32;
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unsigned step, i, c, s, k, new_k, n2;
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/* Principle: if u = exp(i*a1) and v = exp(i*a2), then
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exp(i*(a1+a2)/2) = (u+v) / length(u+v) */
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sin[0] = 0;
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sin[half_pi] = ampls;
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for (step = half_pi; step > 1; step /= 2) {
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/* k = (1 << 16) * amplitude / length(u+v)
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In exact values, k is constant at a given step */
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k = 0x10000;
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for (i = 0; i < half_pi / 2; i += step) {
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s = sin[i] + sin[i + step];
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c = sin[half_pi - i] + sin[half_pi - i - step];
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n2 = s * s + c * c;
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/* Newton's method to solve n² * k² = unit² */
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while (1) {
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new_k = (k + unit2 / ((uint64_t)k * n2) + 1) >> 1;
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if (k == new_k)
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break;
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k = new_k;
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}
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sin[i + step / 2] = (k * s + 0x7FFF) >> 16;
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sin[half_pi - i - step / 2] = (k * c + 0x8000) >> 16;
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}
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}
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/* Unshift amplitude */
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for (i = 0; i <= half_pi; i++)
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sin[i] = (sin[i] + (1 << (AMPLITUDE_SHIFT - 1))) >> AMPLITUDE_SHIFT;
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/* Use symmetries to fill the other three quarters */
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for (i = 0; i < half_pi; i++)
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sin[half_pi * 2 - i] = sin[i];
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for (i = 0; i < 2 * half_pi; i++)
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sin[i + 2 * half_pi] = -sin[i];
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}
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static const char *const var_names[] = {
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"n",
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"pts",
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"t",
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"TB",
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NULL
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};
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enum {
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VAR_N,
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VAR_PTS,
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VAR_T,
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VAR_TB,
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VAR_VARS_NB
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};
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static av_cold int init(AVFilterContext *ctx)
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{
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int ret;
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SineContext *sine = ctx->priv;
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if (!(sine->sin = av_malloc(sizeof(*sine->sin) << LOG_PERIOD)))
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return AVERROR(ENOMEM);
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sine->dphi = ldexp(sine->frequency, 32) / sine->sample_rate + 0.5;
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make_sin_table(sine->sin);
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if (sine->beep_factor) {
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sine->beep_period = sine->sample_rate;
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sine->beep_length = sine->beep_period / 25;
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sine->dphi_beep = ldexp(sine->beep_factor * sine->frequency, 32) /
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sine->sample_rate + 0.5;
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}
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ret = av_expr_parse(&sine->samples_per_frame_expr,
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sine->samples_per_frame, var_names,
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NULL, NULL, NULL, NULL, 0, sine);
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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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SineContext *sine = ctx->priv;
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av_expr_free(sine->samples_per_frame_expr);
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sine->samples_per_frame_expr = NULL;
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av_freep(&sine->sin);
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}
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static av_cold int query_formats(AVFilterContext *ctx)
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{
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SineContext *sine = ctx->priv;
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static const int64_t chlayouts[] = { AV_CH_LAYOUT_MONO, -1 };
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int sample_rates[] = { sine->sample_rate, -1 };
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static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_S16,
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AV_SAMPLE_FMT_NONE };
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int ret = ff_set_common_formats_from_list(ctx, sample_fmts);
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if (ret < 0)
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return ret;
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ret = ff_set_common_channel_layouts_from_list(ctx, chlayouts);
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if (ret < 0)
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return ret;
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return ff_set_common_samplerates_from_list(ctx, sample_rates);
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}
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static av_cold int config_props(AVFilterLink *outlink)
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{
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SineContext *sine = outlink->src->priv;
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sine->duration = av_rescale(sine->duration, sine->sample_rate, AV_TIME_BASE);
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return 0;
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}
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static int activate(AVFilterContext *ctx)
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{
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AVFilterLink *outlink = ctx->outputs[0];
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SineContext *sine = ctx->priv;
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AVFrame *frame;
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double values[VAR_VARS_NB] = {
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[VAR_N] = outlink->frame_count_in,
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[VAR_PTS] = sine->pts,
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[VAR_T] = sine->pts * av_q2d(outlink->time_base),
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[VAR_TB] = av_q2d(outlink->time_base),
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};
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int i, nb_samples = lrint(av_expr_eval(sine->samples_per_frame_expr, values, sine));
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int16_t *samples;
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if (!ff_outlink_frame_wanted(outlink))
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return FFERROR_NOT_READY;
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if (nb_samples <= 0) {
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av_log(sine, AV_LOG_WARNING, "nb samples expression evaluated to %d, "
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"defaulting to 1024\n", nb_samples);
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nb_samples = 1024;
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}
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if (sine->duration) {
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nb_samples = FFMIN(nb_samples, sine->duration - sine->pts);
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av_assert1(nb_samples >= 0);
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if (!nb_samples) {
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ff_outlink_set_status(outlink, AVERROR_EOF, sine->pts);
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return 0;
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}
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}
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if (!(frame = ff_get_audio_buffer(outlink, nb_samples)))
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return AVERROR(ENOMEM);
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samples = (int16_t *)frame->data[0];
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for (i = 0; i < nb_samples; i++) {
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samples[i] = sine->sin[sine->phi >> (32 - LOG_PERIOD)];
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sine->phi += sine->dphi;
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if (sine->beep_index < sine->beep_length) {
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samples[i] += sine->sin[sine->phi_beep >> (32 - LOG_PERIOD)] * 2;
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sine->phi_beep += sine->dphi_beep;
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}
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if (++sine->beep_index == sine->beep_period)
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sine->beep_index = 0;
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}
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frame->pts = sine->pts;
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sine->pts += nb_samples;
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return ff_filter_frame(outlink, frame);
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}
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static const AVFilterPad sine_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_props,
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},
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};
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const AVFilter ff_asrc_sine = {
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.name = "sine",
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.description = NULL_IF_CONFIG_SMALL("Generate sine wave audio signal."),
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.init = init,
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.uninit = uninit,
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.activate = activate,
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.priv_size = sizeof(SineContext),
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.inputs = NULL,
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FILTER_OUTPUTS(sine_outputs),
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FILTER_QUERY_FUNC(query_formats),
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.priv_class = &sine_class,
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};
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