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/* |
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* Copyright (c) 2011 Stefano Sabatini |
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* Copyright (c) 2012 Justin Ruggles <justin.ruggles@gmail.com> |
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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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* audio volume filter |
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*/ |
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#include "libavutil/channel_layout.h" |
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#include "libavutil/common.h" |
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#include "libavutil/eval.h" |
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#include "libavutil/ffmath.h" |
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#include "libavutil/float_dsp.h" |
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#include "libavutil/intreadwrite.h" |
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#include "libavutil/opt.h" |
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#include "libavutil/replaygain.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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#include "af_volume.h" |
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static const char * const precision_str[] = { |
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"fixed", "float", "double" |
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}; |
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static const char *const var_names[] = { |
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"n", ///< frame number (starting at zero) |
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"nb_channels", ///< number of channels |
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"nb_consumed_samples", ///< number of samples consumed by the filter |
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"nb_samples", ///< number of samples in the current frame |
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"pos", ///< position in the file of the frame |
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"pts", ///< frame presentation timestamp |
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"sample_rate", ///< sample rate |
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"startpts", ///< PTS at start of stream |
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"startt", ///< time at start of stream |
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"t", ///< time in the file of the frame |
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"tb", ///< timebase |
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"volume", ///< last set value |
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NULL |
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}; |
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#define OFFSET(x) offsetof(VolumeContext, x) |
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#define A AV_OPT_FLAG_AUDIO_PARAM |
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#define F AV_OPT_FLAG_FILTERING_PARAM |
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#define T AV_OPT_FLAG_RUNTIME_PARAM |
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static const AVOption volume_options[] = { |
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{ "volume", "set volume adjustment expression", |
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OFFSET(volume_expr), AV_OPT_TYPE_STRING, { .str = "1.0" }, .flags = A|F|T }, |
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{ "precision", "select mathematical precision", |
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OFFSET(precision), AV_OPT_TYPE_INT, { .i64 = PRECISION_FLOAT }, PRECISION_FIXED, PRECISION_DOUBLE, A|F, "precision" }, |
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{ "fixed", "select 8-bit fixed-point", 0, AV_OPT_TYPE_CONST, { .i64 = PRECISION_FIXED }, INT_MIN, INT_MAX, A|F, "precision" }, |
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{ "float", "select 32-bit floating-point", 0, AV_OPT_TYPE_CONST, { .i64 = PRECISION_FLOAT }, INT_MIN, INT_MAX, A|F, "precision" }, |
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{ "double", "select 64-bit floating-point", 0, AV_OPT_TYPE_CONST, { .i64 = PRECISION_DOUBLE }, INT_MIN, INT_MAX, A|F, "precision" }, |
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{ "eval", "specify when to evaluate expressions", OFFSET(eval_mode), AV_OPT_TYPE_INT, {.i64 = EVAL_MODE_ONCE}, 0, EVAL_MODE_NB-1, .flags = A|F, "eval" }, |
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{ "once", "eval volume expression once", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_ONCE}, .flags = A|F, .unit = "eval" }, |
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{ "frame", "eval volume expression per-frame", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_FRAME}, .flags = A|F, .unit = "eval" }, |
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{ "replaygain", "Apply replaygain side data when present", |
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OFFSET(replaygain), AV_OPT_TYPE_INT, { .i64 = REPLAYGAIN_DROP }, REPLAYGAIN_DROP, REPLAYGAIN_ALBUM, A|F, "replaygain" }, |
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{ "drop", "replaygain side data is dropped", 0, AV_OPT_TYPE_CONST, { .i64 = REPLAYGAIN_DROP }, 0, 0, A|F, "replaygain" }, |
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{ "ignore", "replaygain side data is ignored", 0, AV_OPT_TYPE_CONST, { .i64 = REPLAYGAIN_IGNORE }, 0, 0, A|F, "replaygain" }, |
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{ "track", "track gain is preferred", 0, AV_OPT_TYPE_CONST, { .i64 = REPLAYGAIN_TRACK }, 0, 0, A|F, "replaygain" }, |
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{ "album", "album gain is preferred", 0, AV_OPT_TYPE_CONST, { .i64 = REPLAYGAIN_ALBUM }, 0, 0, A|F, "replaygain" }, |
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{ "replaygain_preamp", "Apply replaygain pre-amplification", |
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OFFSET(replaygain_preamp), AV_OPT_TYPE_DOUBLE, { .dbl = 0.0 }, -15.0, 15.0, A|F }, |
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{ "replaygain_noclip", "Apply replaygain clipping prevention", |
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OFFSET(replaygain_noclip), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, A|F }, |
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{ NULL } |
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}; |
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AVFILTER_DEFINE_CLASS(volume); |
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static int set_expr(AVExpr **pexpr, const char *expr, void *log_ctx) |
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{ |
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int ret; |
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AVExpr *old = NULL; |
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✗✓ |
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if (*pexpr) |
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old = *pexpr; |
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ret = av_expr_parse(pexpr, expr, var_names, |
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NULL, NULL, NULL, NULL, 0, log_ctx); |
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✗✓ |
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if (ret < 0) { |
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av_log(log_ctx, AV_LOG_ERROR, |
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"Error when evaluating the volume expression '%s'\n", expr); |
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*pexpr = old; |
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return ret; |
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} |
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av_expr_free(old); |
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return 0; |
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} |
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static av_cold int init(AVFilterContext *ctx) |
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{ |
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VolumeContext *vol = ctx->priv; |
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vol->fdsp = avpriv_float_dsp_alloc(0); |
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✗✓ |
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if (!vol->fdsp) |
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return AVERROR(ENOMEM); |
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return set_expr(&vol->volume_pexpr, vol->volume_expr, ctx); |
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} |
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static av_cold void uninit(AVFilterContext *ctx) |
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{ |
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VolumeContext *vol = ctx->priv; |
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av_expr_free(vol->volume_pexpr); |
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av_opt_free(vol); |
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av_freep(&vol->fdsp); |
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} |
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static int query_formats(AVFilterContext *ctx) |
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{ |
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VolumeContext *vol = ctx->priv; |
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AVFilterFormats *formats = NULL; |
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AVFilterChannelLayouts *layouts; |
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static const enum AVSampleFormat sample_fmts[][7] = { |
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[PRECISION_FIXED] = { |
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AV_SAMPLE_FMT_U8, |
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AV_SAMPLE_FMT_U8P, |
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AV_SAMPLE_FMT_S16, |
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AV_SAMPLE_FMT_S16P, |
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AV_SAMPLE_FMT_S32, |
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AV_SAMPLE_FMT_S32P, |
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AV_SAMPLE_FMT_NONE |
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}, |
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[PRECISION_FLOAT] = { |
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AV_SAMPLE_FMT_FLT, |
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AV_SAMPLE_FMT_FLTP, |
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AV_SAMPLE_FMT_NONE |
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}, |
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[PRECISION_DOUBLE] = { |
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AV_SAMPLE_FMT_DBL, |
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AV_SAMPLE_FMT_DBLP, |
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AV_SAMPLE_FMT_NONE |
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} |
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}; |
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int ret; |
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layouts = ff_all_channel_counts(); |
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✗✓ |
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if (!layouts) |
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return AVERROR(ENOMEM); |
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ret = ff_set_common_channel_layouts(ctx, layouts); |
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✗✓ |
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if (ret < 0) |
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return ret; |
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formats = ff_make_format_list(sample_fmts[vol->precision]); |
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✗✓ |
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if (!formats) |
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return AVERROR(ENOMEM); |
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ret = ff_set_common_formats(ctx, formats); |
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✗✓ |
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if (ret < 0) |
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return ret; |
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formats = ff_all_samplerates(); |
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✗✓ |
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if (!formats) |
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return AVERROR(ENOMEM); |
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return ff_set_common_samplerates(ctx, formats); |
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} |
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static inline void scale_samples_u8(uint8_t *dst, const uint8_t *src, |
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int nb_samples, int volume) |
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{ |
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int i; |
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for (i = 0; i < nb_samples; i++) |
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dst[i] = av_clip_uint8(((((int64_t)src[i] - 128) * volume + 128) >> 8) + 128); |
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} |
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static inline void scale_samples_u8_small(uint8_t *dst, const uint8_t *src, |
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int nb_samples, int volume) |
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{ |
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int i; |
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for (i = 0; i < nb_samples; i++) |
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dst[i] = av_clip_uint8((((src[i] - 128) * volume + 128) >> 8) + 128); |
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} |
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static inline void scale_samples_s16(uint8_t *dst, const uint8_t *src, |
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int nb_samples, int volume) |
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{ |
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int i; |
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int16_t *smp_dst = (int16_t *)dst; |
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const int16_t *smp_src = (const int16_t *)src; |
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for (i = 0; i < nb_samples; i++) |
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smp_dst[i] = av_clip_int16(((int64_t)smp_src[i] * volume + 128) >> 8); |
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} |
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static inline void scale_samples_s16_small(uint8_t *dst, const uint8_t *src, |
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int nb_samples, int volume) |
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{ |
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int i; |
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int16_t *smp_dst = (int16_t *)dst; |
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const int16_t *smp_src = (const int16_t *)src; |
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✓✓ |
529459 |
for (i = 0; i < nb_samples; i++) |
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529200 |
smp_dst[i] = av_clip_int16((smp_src[i] * volume + 128) >> 8); |
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} |
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static inline void scale_samples_s32(uint8_t *dst, const uint8_t *src, |
217 |
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int nb_samples, int volume) |
218 |
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{ |
219 |
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int i; |
220 |
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int32_t *smp_dst = (int32_t *)dst; |
221 |
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const int32_t *smp_src = (const int32_t *)src; |
222 |
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for (i = 0; i < nb_samples; i++) |
223 |
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smp_dst[i] = av_clipl_int32((((int64_t)smp_src[i] * volume + 128) >> 8)); |
224 |
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} |
225 |
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226 |
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static av_cold void volume_init(VolumeContext *vol) |
227 |
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{ |
228 |
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vol->samples_align = 1; |
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230 |
✗✓✗✓ ✗✗ |
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switch (av_get_packed_sample_fmt(vol->sample_fmt)) { |
231 |
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case AV_SAMPLE_FMT_U8: |
232 |
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if (vol->volume_i < 0x1000000) |
233 |
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vol->scale_samples = scale_samples_u8_small; |
234 |
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else |
235 |
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vol->scale_samples = scale_samples_u8; |
236 |
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break; |
237 |
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case AV_SAMPLE_FMT_S16: |
238 |
✓✗ |
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if (vol->volume_i < 0x10000) |
239 |
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1 |
vol->scale_samples = scale_samples_s16_small; |
240 |
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else |
241 |
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vol->scale_samples = scale_samples_s16; |
242 |
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1 |
break; |
243 |
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case AV_SAMPLE_FMT_S32: |
244 |
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vol->scale_samples = scale_samples_s32; |
245 |
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break; |
246 |
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1 |
case AV_SAMPLE_FMT_FLT: |
247 |
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1 |
vol->samples_align = 4; |
248 |
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1 |
break; |
249 |
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case AV_SAMPLE_FMT_DBL: |
250 |
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vol->samples_align = 8; |
251 |
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break; |
252 |
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} |
253 |
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254 |
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2 |
if (ARCH_X86) |
255 |
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ff_volume_init_x86(vol); |
256 |
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} |
257 |
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258 |
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2 |
static int set_volume(AVFilterContext *ctx) |
259 |
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{ |
260 |
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VolumeContext *vol = ctx->priv; |
261 |
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262 |
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2 |
vol->volume = av_expr_eval(vol->volume_pexpr, vol->var_values, NULL); |
263 |
✗✓ |
2 |
if (isnan(vol->volume)) { |
264 |
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if (vol->eval_mode == EVAL_MODE_ONCE) { |
265 |
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av_log(ctx, AV_LOG_ERROR, "Invalid value NaN for volume\n"); |
266 |
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return AVERROR(EINVAL); |
267 |
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} else { |
268 |
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av_log(ctx, AV_LOG_WARNING, "Invalid value NaN for volume, setting to 0\n"); |
269 |
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vol->volume = 0; |
270 |
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} |
271 |
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} |
272 |
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2 |
vol->var_values[VAR_VOLUME] = vol->volume; |
273 |
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274 |
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2 |
av_log(ctx, AV_LOG_VERBOSE, "n:%f t:%f pts:%f precision:%s ", |
275 |
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vol->var_values[VAR_N], vol->var_values[VAR_T], vol->var_values[VAR_PTS], |
276 |
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precision_str[vol->precision]); |
277 |
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278 |
✓✓ |
2 |
if (vol->precision == PRECISION_FIXED) { |
279 |
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1 |
vol->volume_i = (int)(vol->volume * 256 + 0.5); |
280 |
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1 |
vol->volume = vol->volume_i / 256.0; |
281 |
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1 |
av_log(ctx, AV_LOG_VERBOSE, "volume_i:%d/255 ", vol->volume_i); |
282 |
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} |
283 |
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2 |
av_log(ctx, AV_LOG_VERBOSE, "volume:%f volume_dB:%f\n", |
284 |
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2 |
vol->volume, 20.0*log10(vol->volume)); |
285 |
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286 |
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2 |
volume_init(vol); |
287 |
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2 |
return 0; |
288 |
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} |
289 |
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290 |
|
2 |
static int config_output(AVFilterLink *outlink) |
291 |
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{ |
292 |
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2 |
AVFilterContext *ctx = outlink->src; |
293 |
|
2 |
VolumeContext *vol = ctx->priv; |
294 |
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2 |
AVFilterLink *inlink = ctx->inputs[0]; |
295 |
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296 |
|
2 |
vol->sample_fmt = inlink->format; |
297 |
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2 |
vol->channels = inlink->channels; |
298 |
✓✓ |
2 |
vol->planes = av_sample_fmt_is_planar(inlink->format) ? vol->channels : 1; |
299 |
|
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|
300 |
|
2 |
vol->var_values[VAR_N] = |
301 |
|
2 |
vol->var_values[VAR_NB_CONSUMED_SAMPLES] = |
302 |
|
2 |
vol->var_values[VAR_NB_SAMPLES] = |
303 |
|
2 |
vol->var_values[VAR_POS] = |
304 |
|
2 |
vol->var_values[VAR_PTS] = |
305 |
|
2 |
vol->var_values[VAR_STARTPTS] = |
306 |
|
2 |
vol->var_values[VAR_STARTT] = |
307 |
|
2 |
vol->var_values[VAR_T] = |
308 |
|
2 |
vol->var_values[VAR_VOLUME] = NAN; |
309 |
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|
310 |
|
2 |
vol->var_values[VAR_NB_CHANNELS] = inlink->channels; |
311 |
|
2 |
vol->var_values[VAR_TB] = av_q2d(inlink->time_base); |
312 |
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2 |
vol->var_values[VAR_SAMPLE_RATE] = inlink->sample_rate; |
313 |
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|
314 |
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2 |
av_log(inlink->src, AV_LOG_VERBOSE, "tb:%f sample_rate:%f nb_channels:%f\n", |
315 |
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vol->var_values[VAR_TB], |
316 |
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vol->var_values[VAR_SAMPLE_RATE], |
317 |
|
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vol->var_values[VAR_NB_CHANNELS]); |
318 |
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|
319 |
|
2 |
return set_volume(ctx); |
320 |
|
|
} |
321 |
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|
322 |
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static int process_command(AVFilterContext *ctx, const char *cmd, const char *args, |
323 |
|
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char *res, int res_len, int flags) |
324 |
|
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{ |
325 |
|
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VolumeContext *vol = ctx->priv; |
326 |
|
|
int ret = AVERROR(ENOSYS); |
327 |
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|
328 |
|
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if (!strcmp(cmd, "volume")) { |
329 |
|
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if ((ret = set_expr(&vol->volume_pexpr, args, ctx)) < 0) |
330 |
|
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return ret; |
331 |
|
|
if (vol->eval_mode == EVAL_MODE_ONCE) |
332 |
|
|
set_volume(ctx); |
333 |
|
|
} |
334 |
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|
335 |
|
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return ret; |
336 |
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|
} |
337 |
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|
338 |
|
300 |
static int filter_frame(AVFilterLink *inlink, AVFrame *buf) |
339 |
|
|
{ |
340 |
|
300 |
AVFilterContext *ctx = inlink->dst; |
341 |
|
300 |
VolumeContext *vol = inlink->dst->priv; |
342 |
|
300 |
AVFilterLink *outlink = inlink->dst->outputs[0]; |
343 |
|
300 |
int nb_samples = buf->nb_samples; |
344 |
|
|
AVFrame *out_buf; |
345 |
|
|
int64_t pos; |
346 |
|
300 |
AVFrameSideData *sd = av_frame_get_side_data(buf, AV_FRAME_DATA_REPLAYGAIN); |
347 |
|
|
int ret; |
348 |
|
|
|
349 |
✗✓✗✗
|
300 |
if (sd && vol->replaygain != REPLAYGAIN_IGNORE) { |
350 |
|
|
if (vol->replaygain != REPLAYGAIN_DROP) { |
351 |
|
|
AVReplayGain *replaygain = (AVReplayGain*)sd->data; |
352 |
|
|
int32_t gain = 100000; |
353 |
|
|
uint32_t peak = 100000; |
354 |
|
|
float g, p; |
355 |
|
|
|
356 |
|
|
if (vol->replaygain == REPLAYGAIN_TRACK && |
357 |
|
|
replaygain->track_gain != INT32_MIN) { |
358 |
|
|
gain = replaygain->track_gain; |
359 |
|
|
|
360 |
|
|
if (replaygain->track_peak != 0) |
361 |
|
|
peak = replaygain->track_peak; |
362 |
|
|
} else if (replaygain->album_gain != INT32_MIN) { |
363 |
|
|
gain = replaygain->album_gain; |
364 |
|
|
|
365 |
|
|
if (replaygain->album_peak != 0) |
366 |
|
|
peak = replaygain->album_peak; |
367 |
|
|
} else { |
368 |
|
|
av_log(inlink->dst, AV_LOG_WARNING, "Both ReplayGain gain " |
369 |
|
|
"values are unknown.\n"); |
370 |
|
|
} |
371 |
|
|
g = gain / 100000.0f; |
372 |
|
|
p = peak / 100000.0f; |
373 |
|
|
|
374 |
|
|
av_log(inlink->dst, AV_LOG_VERBOSE, |
375 |
|
|
"Using gain %f dB from replaygain side data.\n", g); |
376 |
|
|
|
377 |
|
|
vol->volume = ff_exp10((g + vol->replaygain_preamp) / 20); |
378 |
|
|
if (vol->replaygain_noclip) |
379 |
|
|
vol->volume = FFMIN(vol->volume, 1.0 / p); |
380 |
|
|
vol->volume_i = (int)(vol->volume * 256 + 0.5); |
381 |
|
|
|
382 |
|
|
volume_init(vol); |
383 |
|
|
} |
384 |
|
|
av_frame_remove_side_data(buf, AV_FRAME_DATA_REPLAYGAIN); |
385 |
|
|
} |
386 |
|
|
|
387 |
✓✓ |
300 |
if (isnan(vol->var_values[VAR_STARTPTS])) { |
388 |
✓✗ |
2 |
vol->var_values[VAR_STARTPTS] = TS2D(buf->pts); |
389 |
✓✗ |
2 |
vol->var_values[VAR_STARTT ] = TS2T(buf->pts, inlink->time_base); |
390 |
|
|
} |
391 |
✓✗ |
300 |
vol->var_values[VAR_PTS] = TS2D(buf->pts); |
392 |
✓✗ |
300 |
vol->var_values[VAR_T ] = TS2T(buf->pts, inlink->time_base); |
393 |
|
300 |
vol->var_values[VAR_N ] = inlink->frame_count_out; |
394 |
|
|
|
395 |
|
300 |
pos = buf->pkt_pos; |
396 |
✓✓ |
300 |
vol->var_values[VAR_POS] = pos == -1 ? NAN : pos; |
397 |
✗✓ |
300 |
if (vol->eval_mode == EVAL_MODE_FRAME) |
398 |
|
|
set_volume(ctx); |
399 |
|
|
|
400 |
✓✗✗✓
|
300 |
if (vol->volume == 1.0 || vol->volume_i == 256) { |
401 |
|
|
out_buf = buf; |
402 |
|
|
goto end; |
403 |
|
|
} |
404 |
|
|
|
405 |
|
|
/* do volume scaling in-place if input buffer is writable */ |
406 |
✓✗ |
300 |
if (av_frame_is_writable(buf) |
407 |
✓✓✓✗
|
300 |
&& (vol->precision != PRECISION_FIXED || vol->volume_i > 0)) { |
408 |
|
300 |
out_buf = buf; |
409 |
|
|
} else { |
410 |
|
|
out_buf = ff_get_audio_buffer(outlink, nb_samples); |
411 |
|
|
if (!out_buf) { |
412 |
|
|
av_frame_free(&buf); |
413 |
|
|
return AVERROR(ENOMEM); |
414 |
|
|
} |
415 |
|
|
ret = av_frame_copy_props(out_buf, buf); |
416 |
|
|
if (ret < 0) { |
417 |
|
|
av_frame_free(&out_buf); |
418 |
|
|
av_frame_free(&buf); |
419 |
|
|
return ret; |
420 |
|
|
} |
421 |
|
|
} |
422 |
|
|
|
423 |
✓✓✓✗
|
300 |
if (vol->precision != PRECISION_FIXED || vol->volume_i > 0) { |
424 |
|
|
int p, plane_samples; |
425 |
|
|
|
426 |
✓✓ |
300 |
if (av_sample_fmt_is_planar(buf->format)) |
427 |
|
41 |
plane_samples = FFALIGN(nb_samples, vol->samples_align); |
428 |
|
|
else |
429 |
|
259 |
plane_samples = FFALIGN(nb_samples * vol->channels, vol->samples_align); |
430 |
|
|
|
431 |
✓✓ |
300 |
if (vol->precision == PRECISION_FIXED) { |
432 |
✓✓ |
518 |
for (p = 0; p < vol->planes; p++) { |
433 |
|
259 |
vol->scale_samples(out_buf->extended_data[p], |
434 |
|
259 |
buf->extended_data[p], plane_samples, |
435 |
|
|
vol->volume_i); |
436 |
|
|
} |
437 |
✓✗ |
41 |
} else if (av_get_packed_sample_fmt(vol->sample_fmt) == AV_SAMPLE_FMT_FLT) { |
438 |
✓✓ |
123 |
for (p = 0; p < vol->planes; p++) { |
439 |
|
82 |
vol->fdsp->vector_fmul_scalar((float *)out_buf->extended_data[p], |
440 |
|
82 |
(const float *)buf->extended_data[p], |
441 |
|
82 |
vol->volume, plane_samples); |
442 |
|
|
} |
443 |
|
|
} else { |
444 |
|
|
for (p = 0; p < vol->planes; p++) { |
445 |
|
|
vol->fdsp->vector_dmul_scalar((double *)out_buf->extended_data[p], |
446 |
|
|
(const double *)buf->extended_data[p], |
447 |
|
|
vol->volume, plane_samples); |
448 |
|
|
} |
449 |
|
|
} |
450 |
|
|
} |
451 |
|
|
|
452 |
|
300 |
emms_c(); |
453 |
|
|
|
454 |
✓✗ |
300 |
if (buf != out_buf) |
455 |
|
|
av_frame_free(&buf); |
456 |
|
|
|
457 |
|
300 |
end: |
458 |
|
300 |
vol->var_values[VAR_NB_CONSUMED_SAMPLES] += out_buf->nb_samples; |
459 |
|
300 |
return ff_filter_frame(outlink, out_buf); |
460 |
|
|
} |
461 |
|
|
|
462 |
|
|
static const AVFilterPad avfilter_af_volume_inputs[] = { |
463 |
|
|
{ |
464 |
|
|
.name = "default", |
465 |
|
|
.type = AVMEDIA_TYPE_AUDIO, |
466 |
|
|
.filter_frame = filter_frame, |
467 |
|
|
}, |
468 |
|
|
{ NULL } |
469 |
|
|
}; |
470 |
|
|
|
471 |
|
|
static const AVFilterPad avfilter_af_volume_outputs[] = { |
472 |
|
|
{ |
473 |
|
|
.name = "default", |
474 |
|
|
.type = AVMEDIA_TYPE_AUDIO, |
475 |
|
|
.config_props = config_output, |
476 |
|
|
}, |
477 |
|
|
{ NULL } |
478 |
|
|
}; |
479 |
|
|
|
480 |
|
|
AVFilter ff_af_volume = { |
481 |
|
|
.name = "volume", |
482 |
|
|
.description = NULL_IF_CONFIG_SMALL("Change input volume."), |
483 |
|
|
.query_formats = query_formats, |
484 |
|
|
.priv_size = sizeof(VolumeContext), |
485 |
|
|
.priv_class = &volume_class, |
486 |
|
|
.init = init, |
487 |
|
|
.uninit = uninit, |
488 |
|
|
.inputs = avfilter_af_volume_inputs, |
489 |
|
|
.outputs = avfilter_af_volume_outputs, |
490 |
|
|
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, |
491 |
|
|
.process_command = process_command, |
492 |
|
|
}; |