OBS插件学习入门：一个非常简单的、调节音量的filter-白红宇

OBS插件学习入门：一个非常简单的、调节音量的filter

阅读量：6867 次

发布时间：2019-06-26

本文共 1988 字，大约阅读时间需要 6 分钟。

一个非常简单的、调节音量的filter，非线性调节：

#include 
     
      #include 
      
       struct volume_data {    obs_source_t *context;    size_t channels;    float factor;};static const char *volume_name(void *unused){    UNUSED_PARAMETER(unused);    return obs_module_text("Volume");}static void volume_destroy(void *data){    struct volume_data *gf = data;    bfree(gf);}static void volume_update(void *data, obs_data_t *s){    struct volume_data *gf = data;    double val = obs_data_get_double(s, "volume");    gf->channels = audio_output_get_channels(obs_get_audio());    gf->factor = (float)val;}static void *volume_create(obs_data_t *settings, obs_source_t *filter){    struct volume_data *gf = bzalloc(sizeof(*gf));    gf->context = filter;    volume_update(gf, settings);    return gf;}static struct obs_audio_data *volume_filter_audio(void *data, struct obs_audio_data *audio){    struct volume_data *gf = data;    const size_t channels = gf->channels;    float **adata = (float**)audio->data;    const float factor = gf->factor;    for (size_t c = 0; c < channels; c++) {        if (audio->data[c]) {            for (size_t i = 0; i < audio->frames; i++) {                adata[c][i] *= factor;            }        }    }    return audio;}static void volume_defaults(obs_data_t *s){    obs_data_set_default_double(s, "volume", 1.0f);}static obs_properties_t *volume_properties(void *data){    obs_properties_t *ppts = obs_properties_create();    obs_properties_add_float_slider(ppts, "volume", "Volume", 0, 1.0, 0.1);    UNUSED_PARAMETER(data);    return ppts;}struct obs_source_info volume_filter = {    .id = "volume_filter",    .type = OBS_SOURCE_TYPE_FILTER,    .output_flags = OBS_SOURCE_AUDIO,    .get_name = volume_name,    .create = volume_create,    .destroy = volume_destroy,    .update = volume_update,    .filter_audio = volume_filter_audio,    .get_defaults = volume_defaults,    .get_properties = volume_properties,};