493 lines
17 KiB
C
493 lines
17 KiB
C
/*
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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/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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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 },
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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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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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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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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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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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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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if (!formats)
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return AVERROR(ENOMEM);
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ret = ff_set_common_formats(ctx, formats);
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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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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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for (i = 0; i < nb_samples; i++)
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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,
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int nb_samples, int volume)
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{
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int i;
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int32_t *smp_dst = (int32_t *)dst;
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const int32_t *smp_src = (const int32_t *)src;
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for (i = 0; i < nb_samples; i++)
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smp_dst[i] = av_clipl_int32((((int64_t)smp_src[i] * volume + 128) >> 8));
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}
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static av_cold void volume_init(VolumeContext *vol)
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{
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vol->samples_align = 1;
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switch (av_get_packed_sample_fmt(vol->sample_fmt)) {
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case AV_SAMPLE_FMT_U8:
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if (vol->volume_i < 0x1000000)
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vol->scale_samples = scale_samples_u8_small;
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else
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vol->scale_samples = scale_samples_u8;
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break;
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case AV_SAMPLE_FMT_S16:
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if (vol->volume_i < 0x10000)
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vol->scale_samples = scale_samples_s16_small;
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else
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vol->scale_samples = scale_samples_s16;
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break;
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case AV_SAMPLE_FMT_S32:
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vol->scale_samples = scale_samples_s32;
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break;
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case AV_SAMPLE_FMT_FLT:
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vol->samples_align = 4;
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break;
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case AV_SAMPLE_FMT_DBL:
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vol->samples_align = 8;
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break;
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}
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if (ARCH_X86)
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ff_volume_init_x86(vol);
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}
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static int set_volume(AVFilterContext *ctx)
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{
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VolumeContext *vol = ctx->priv;
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vol->volume = av_expr_eval(vol->volume_pexpr, vol->var_values, NULL);
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if (isnan(vol->volume)) {
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if (vol->eval_mode == EVAL_MODE_ONCE) {
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av_log(ctx, AV_LOG_ERROR, "Invalid value NaN for volume\n");
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return AVERROR(EINVAL);
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} else {
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av_log(ctx, AV_LOG_WARNING, "Invalid value NaN for volume, setting to 0\n");
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vol->volume = 0;
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}
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}
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vol->var_values[VAR_VOLUME] = vol->volume;
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av_log(ctx, AV_LOG_VERBOSE, "n:%f t:%f pts:%f precision:%s ",
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vol->var_values[VAR_N], vol->var_values[VAR_T], vol->var_values[VAR_PTS],
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precision_str[vol->precision]);
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if (vol->precision == PRECISION_FIXED) {
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vol->volume_i = (int)(vol->volume * 256 + 0.5);
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vol->volume = vol->volume_i / 256.0;
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av_log(ctx, AV_LOG_VERBOSE, "volume_i:%d/255 ", vol->volume_i);
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}
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av_log(ctx, AV_LOG_VERBOSE, "volume:%f volume_dB:%f\n",
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vol->volume, 20.0*log(vol->volume)/M_LN10);
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volume_init(vol);
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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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VolumeContext *vol = ctx->priv;
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AVFilterLink *inlink = ctx->inputs[0];
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vol->sample_fmt = inlink->format;
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vol->channels = inlink->channels;
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vol->planes = av_sample_fmt_is_planar(inlink->format) ? vol->channels : 1;
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vol->var_values[VAR_N] =
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vol->var_values[VAR_NB_CONSUMED_SAMPLES] =
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vol->var_values[VAR_NB_SAMPLES] =
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vol->var_values[VAR_POS] =
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vol->var_values[VAR_PTS] =
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vol->var_values[VAR_STARTPTS] =
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vol->var_values[VAR_STARTT] =
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vol->var_values[VAR_T] =
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vol->var_values[VAR_VOLUME] = NAN;
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vol->var_values[VAR_NB_CHANNELS] = inlink->channels;
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vol->var_values[VAR_TB] = av_q2d(inlink->time_base);
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vol->var_values[VAR_SAMPLE_RATE] = inlink->sample_rate;
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av_log(inlink->src, AV_LOG_VERBOSE, "tb:%f sample_rate:%f nb_channels:%f\n",
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vol->var_values[VAR_TB],
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vol->var_values[VAR_SAMPLE_RATE],
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vol->var_values[VAR_NB_CHANNELS]);
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return set_volume(ctx);
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}
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static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
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char *res, int res_len, int flags)
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{
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VolumeContext *vol = ctx->priv;
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int ret = AVERROR(ENOSYS);
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if (!strcmp(cmd, "volume")) {
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if ((ret = set_expr(&vol->volume_pexpr, args, ctx)) < 0)
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return ret;
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if (vol->eval_mode == EVAL_MODE_ONCE)
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set_volume(ctx);
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}
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return ret;
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}
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#define D2TS(d) (isnan(d) ? AV_NOPTS_VALUE : (int64_t)(d))
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#define TS2D(ts) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts))
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#define TS2T(ts, tb) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts)*av_q2d(tb))
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static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
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{
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AVFilterContext *ctx = inlink->dst;
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VolumeContext *vol = inlink->dst->priv;
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AVFilterLink *outlink = inlink->dst->outputs[0];
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int nb_samples = buf->nb_samples;
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AVFrame *out_buf;
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int64_t pos;
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AVFrameSideData *sd = av_frame_get_side_data(buf, AV_FRAME_DATA_REPLAYGAIN);
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int ret;
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if (sd && vol->replaygain != REPLAYGAIN_IGNORE) {
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if (vol->replaygain != REPLAYGAIN_DROP) {
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AVReplayGain *replaygain = (AVReplayGain*)sd->data;
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int32_t gain = 100000;
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uint32_t peak = 100000;
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float g, p;
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if (vol->replaygain == REPLAYGAIN_TRACK &&
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replaygain->track_gain != INT32_MIN) {
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gain = replaygain->track_gain;
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if (replaygain->track_peak != 0)
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peak = replaygain->track_peak;
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} else if (replaygain->album_gain != INT32_MIN) {
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gain = replaygain->album_gain;
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if (replaygain->album_peak != 0)
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peak = replaygain->album_peak;
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} else {
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av_log(inlink->dst, AV_LOG_WARNING, "Both ReplayGain gain "
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"values are unknown.\n");
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}
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g = gain / 100000.0f;
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p = peak / 100000.0f;
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av_log(inlink->dst, AV_LOG_VERBOSE,
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"Using gain %f dB from replaygain side data.\n", g);
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vol->volume = pow(10, (g + vol->replaygain_preamp) / 20);
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if (vol->replaygain_noclip)
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vol->volume = FFMIN(vol->volume, 1.0 / p);
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vol->volume_i = (int)(vol->volume * 256 + 0.5);
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volume_init(vol);
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}
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av_frame_remove_side_data(buf, AV_FRAME_DATA_REPLAYGAIN);
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}
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if (isnan(vol->var_values[VAR_STARTPTS])) {
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vol->var_values[VAR_STARTPTS] = TS2D(buf->pts);
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vol->var_values[VAR_STARTT ] = TS2T(buf->pts, inlink->time_base);
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}
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vol->var_values[VAR_PTS] = TS2D(buf->pts);
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vol->var_values[VAR_T ] = TS2T(buf->pts, inlink->time_base);
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vol->var_values[VAR_N ] = inlink->frame_count;
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pos = av_frame_get_pkt_pos(buf);
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vol->var_values[VAR_POS] = pos == -1 ? NAN : pos;
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if (vol->eval_mode == EVAL_MODE_FRAME)
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set_volume(ctx);
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if (vol->volume == 1.0 || vol->volume_i == 256) {
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out_buf = buf;
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goto end;
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}
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/* do volume scaling in-place if input buffer is writable */
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if (av_frame_is_writable(buf)
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&& (vol->precision != PRECISION_FIXED || vol->volume_i > 0)) {
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out_buf = buf;
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} else {
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out_buf = ff_get_audio_buffer(inlink, nb_samples);
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if (!out_buf)
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return AVERROR(ENOMEM);
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ret = av_frame_copy_props(out_buf, buf);
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if (ret < 0) {
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av_frame_free(&out_buf);
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av_frame_free(&buf);
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return ret;
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}
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}
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if (vol->precision != PRECISION_FIXED || vol->volume_i > 0) {
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int p, plane_samples;
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if (av_sample_fmt_is_planar(buf->format))
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plane_samples = FFALIGN(nb_samples, vol->samples_align);
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else
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plane_samples = FFALIGN(nb_samples * vol->channels, vol->samples_align);
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if (vol->precision == PRECISION_FIXED) {
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for (p = 0; p < vol->planes; p++) {
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vol->scale_samples(out_buf->extended_data[p],
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buf->extended_data[p], plane_samples,
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vol->volume_i);
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}
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} else if (av_get_packed_sample_fmt(vol->sample_fmt) == AV_SAMPLE_FMT_FLT) {
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for (p = 0; p < vol->planes; p++) {
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vol->fdsp->vector_fmul_scalar((float *)out_buf->extended_data[p],
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|
(const float *)buf->extended_data[p],
|
|
vol->volume, plane_samples);
|
|
}
|
|
} else {
|
|
for (p = 0; p < vol->planes; p++) {
|
|
vol->fdsp->vector_dmul_scalar((double *)out_buf->extended_data[p],
|
|
(const double *)buf->extended_data[p],
|
|
vol->volume, plane_samples);
|
|
}
|
|
}
|
|
}
|
|
|
|
emms_c();
|
|
|
|
if (buf != out_buf)
|
|
av_frame_free(&buf);
|
|
|
|
end:
|
|
vol->var_values[VAR_NB_CONSUMED_SAMPLES] += out_buf->nb_samples;
|
|
return ff_filter_frame(outlink, out_buf);
|
|
}
|
|
|
|
static const AVFilterPad avfilter_af_volume_inputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
|
.filter_frame = filter_frame,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
static const AVFilterPad avfilter_af_volume_outputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
|
.config_props = config_output,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
AVFilter ff_af_volume = {
|
|
.name = "volume",
|
|
.description = NULL_IF_CONFIG_SMALL("Change input volume."),
|
|
.query_formats = query_formats,
|
|
.priv_size = sizeof(VolumeContext),
|
|
.priv_class = &volume_class,
|
|
.init = init,
|
|
.uninit = uninit,
|
|
.inputs = avfilter_af_volume_inputs,
|
|
.outputs = avfilter_af_volume_outputs,
|
|
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
|
|
.process_command = process_command,
|
|
};
|