diff options
Diffstat (limited to 'libavfilter/af_volume_stefano.c')
-rw-r--r-- | libavfilter/af_volume_stefano.c | 201 |
1 files changed, 0 insertions, 201 deletions
diff --git a/libavfilter/af_volume_stefano.c b/libavfilter/af_volume_stefano.c deleted file mode 100644 index 7608083..0000000 --- a/libavfilter/af_volume_stefano.c +++ /dev/null @@ -1,201 +0,0 @@ -/* - * Copyright (c) 2011 Stefano Sabatini - * - * This file is part of FFmpeg. - * - * FFmpeg is free software; you can redistribute it and/or - * modify it under the terms of the GNU Lesser General Public - * License as published by the Free Software Foundation; either - * version 2.1 of the License, or (at your option) any later version. - * - * FFmpeg is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with FFmpeg; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA - */ - -/** - * @file - * audio volume filter - * based on ffmpeg.c code - */ - -#include "libavutil/channel_layout.h" -#include "libavutil/eval.h" -#include "audio.h" -#include "avfilter.h" -#include "formats.h" - -typedef struct { - double volume; - int volume_i; -} VolumeContext; - -static av_cold int init(AVFilterContext *ctx, const char *args) -{ - VolumeContext *vol = ctx->priv; - char *tail; - int ret = 0; - - vol->volume = 1.0; - - if (args) { - /* parse the number as a decimal number */ - double d = strtod(args, &tail); - - if (*tail) { - if (!strcmp(tail, "dB")) { - /* consider the argument an adjustement in decibels */ - d = pow(10, d/20); - } else { - /* parse the argument as an expression */ - ret = av_expr_parse_and_eval(&d, args, NULL, NULL, - NULL, NULL, NULL, NULL, - NULL, 0, ctx); - } - } - - if (ret < 0) { - av_log(ctx, AV_LOG_ERROR, - "Invalid volume argument '%s'\n", args); - return AVERROR(EINVAL); - } - - if (d < 0 || d > 65536) { /* 65536 = INT_MIN / (128 * 256) */ - av_log(ctx, AV_LOG_ERROR, - "Negative or too big volume value %f\n", d); - return AVERROR(EINVAL); - } - - vol->volume = d; - } - - vol->volume_i = (int)(vol->volume * 256 + 0.5); - av_log(ctx, AV_LOG_VERBOSE, "volume=%f\n", vol->volume); - return 0; -} - -static int query_formats(AVFilterContext *ctx) -{ - AVFilterFormats *formats = NULL; - AVFilterChannelLayouts *layouts; - enum AVSampleFormat sample_fmts[] = { - AV_SAMPLE_FMT_U8, - AV_SAMPLE_FMT_S16, - AV_SAMPLE_FMT_S32, - AV_SAMPLE_FMT_FLT, - AV_SAMPLE_FMT_DBL, - AV_SAMPLE_FMT_NONE - }; - - layouts = ff_all_channel_layouts(); - if (!layouts) - return AVERROR(ENOMEM); - ff_set_common_channel_layouts(ctx, layouts); - - formats = ff_make_format_list(sample_fmts); - if (!formats) - return AVERROR(ENOMEM); - ff_set_common_formats(ctx, formats); - - formats = ff_all_samplerates(); - if (!formats) - return AVERROR(ENOMEM); - ff_set_common_samplerates(ctx, formats); - - return 0; -} - -static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *insamples) -{ - VolumeContext *vol = inlink->dst->priv; - AVFilterLink *outlink = inlink->dst->outputs[0]; - const int nb_samples = insamples->audio->nb_samples * - av_get_channel_layout_nb_channels(insamples->audio->channel_layout); - const double volume = vol->volume; - const int volume_i = vol->volume_i; - int i; - - if (volume_i != 256) { - switch (insamples->format) { - case AV_SAMPLE_FMT_U8: - { - uint8_t *p = (void *)insamples->data[0]; - for (i = 0; i < nb_samples; i++) { - int v = (((*p - 128) * volume_i + 128) >> 8) + 128; - *p++ = av_clip_uint8(v); - } - break; - } - case AV_SAMPLE_FMT_S16: - { - int16_t *p = (void *)insamples->data[0]; - for (i = 0; i < nb_samples; i++) { - int v = ((int64_t)*p * volume_i + 128) >> 8; - *p++ = av_clip_int16(v); - } - break; - } - case AV_SAMPLE_FMT_S32: - { - int32_t *p = (void *)insamples->data[0]; - for (i = 0; i < nb_samples; i++) { - int64_t v = (((int64_t)*p * volume_i + 128) >> 8); - *p++ = av_clipl_int32(v); - } - break; - } - case AV_SAMPLE_FMT_FLT: - { - float *p = (void *)insamples->data[0]; - float scale = (float)volume; - for (i = 0; i < nb_samples; i++) { - *p++ *= scale; - } - break; - } - case AV_SAMPLE_FMT_DBL: - { - double *p = (void *)insamples->data[0]; - for (i = 0; i < nb_samples; i++) { - *p *= volume; - p++; - } - break; - } - } - } - return ff_filter_frame(outlink, insamples); -} - -static const AVFilterPad volume_inputs[] = { - { - .name = "default", - .type = AVMEDIA_TYPE_AUDIO, - .filter_frame = filter_frame, - .min_perms = AV_PERM_READ | AV_PERM_WRITE, - }, - { NULL }, -}; - -static const AVFilterPad volume_outputs[] = { - { - .name = "default", - .type = AVMEDIA_TYPE_AUDIO, - }, - { NULL }, -}; - -AVFilter avfilter_af_volume = { - .name = "volume", - .description = NULL_IF_CONFIG_SMALL("Change input volume."), - .query_formats = query_formats, - .priv_size = sizeof(VolumeContext), - .init = init, - .inputs = volume_inputs, - .outputs = volume_outputs, -}; |