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author | anders <anders@b3059339-0415-0410-9bf9-f77b7e298cf2> | 2002-02-25 13:31:26 +0000 |
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committer | anders <anders@b3059339-0415-0410-9bf9-f77b7e298cf2> | 2002-02-25 13:31:26 +0000 |
commit | 330d33256f51e049ee93458b43cef557a8a96f7e (patch) | |
tree | f2ce84ccba67afdef2672aa17c1923a6481ed368 /libao2 | |
parent | 4b6f1667dbc44aebfae5de7d92ae5b8a2095c243 (diff) | |
download | mpv-330d33256f51e049ee93458b43cef557a8a96f7e.tar.bz2 mpv-330d33256f51e049ee93458b43cef557a8a96f7e.tar.xz |
Adding SW volume control
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@4860 b3059339-0415-0410-9bf9-f77b7e298cf2
Diffstat (limited to 'libao2')
-rw-r--r-- | libao2/Makefile | 2 | ||||
-rw-r--r-- | libao2/ao_plugin.c | 13 | ||||
-rw-r--r-- | libao2/audio_plugin.h | 10 | ||||
-rw-r--r-- | libao2/pl_volume.c | 133 |
4 files changed, 152 insertions, 6 deletions
diff --git a/libao2/Makefile b/libao2/Makefile index fe4a787fbc..96d730db63 100644 --- a/libao2/Makefile +++ b/libao2/Makefile @@ -4,7 +4,7 @@ include config.mak LIBNAME = libao2.a # TODO: moveout ao_sdl.c so it's only used when SDL is detected -SRCS=afmt.c audio_out.c ao_mpegpes.c ao_null.c ao_pcm.c ao_plugin.c pl_delay.c pl_format.c pl_surround.c remez.c pl_resample.c $(OPTIONAL_SRCS) +SRCS=afmt.c audio_out.c ao_mpegpes.c ao_null.c ao_pcm.c ao_plugin.c pl_delay.c pl_format.c pl_surround.c remez.c pl_resample.c pl_volume.c $(OPTIONAL_SRCS) OBJS=$(SRCS:.c=.o) diff --git a/libao2/ao_plugin.c b/libao2/ao_plugin.c index 8038660977..a5907438cd 100644 --- a/libao2/ao_plugin.c +++ b/libao2/ao_plugin.c @@ -36,8 +36,8 @@ typedef struct ao_plugin_local_data_s static ao_plugin_local_data_t ao_plugin_local_data={NULL,0,0.0,NULL,NULL,AO_PLUGINS}; // global data -volatile ao_plugin_data_t ao_plugin_data; // Data used by the plugins -volatile ao_plugin_cfg_t ao_plugin_cfg=CFG_DEFAULTS; // Set in cfg-mplayer.h +ao_plugin_data_t ao_plugin_data; // Data used by the plugins +ao_plugin_cfg_t ao_plugin_cfg=CFG_DEFAULTS; // Set in cfg-mplayer.h // to set/get/query special features/parameters static int control(int cmd,int arg){ @@ -45,6 +45,15 @@ static int control(int cmd,int arg){ case AOCONTROL_SET_PLUGIN_DRIVER: ao_plugin_local_data.driver=(ao_functions_t*)arg; return CONTROL_OK; + case AOCONTROL_GET_VOLUME: + case AOCONTROL_SET_VOLUME: + { + int r=audio_plugin_volume.control(cmd,arg); + if(CONTROL_OK != r) + return driver()->control(cmd,arg); + else + return r; + } default: return driver()->control(cmd,arg); } diff --git a/libao2/audio_plugin.h b/libao2/audio_plugin.h index cfe71792ce..145b4e3e14 100644 --- a/libao2/audio_plugin.h +++ b/libao2/audio_plugin.h @@ -35,27 +35,30 @@ typedef struct ao_plugin_cfg_s int pl_format_type; // Output format int pl_delay_len; // Number of samples to delay sound output int pl_resample_fout; // Output frequency from resampling + int pl_volume_volume; // Initial volume setting } ao_plugin_cfg_t; -extern volatile ao_plugin_cfg_t ao_plugin_cfg; +extern ao_plugin_cfg_t ao_plugin_cfg; // Configuration defaults #define CFG_DEFAULTS { \ NULL, \ AFMT_S16_LE, \ 0, \ - 48000 \ + 48000, \ + 255 \ }; // This block should not be available in the pl_xxxx files // due to compilation issues #ifndef PLUGIN -#define NPL 4+1 // Number of PLugins ( +1 list ends with NULL ) +#define NPL 5+1 // Number of PLugins ( +1 list ends with NULL ) // List of plugins extern ao_plugin_functions_t audio_plugin_delay; extern ao_plugin_functions_t audio_plugin_format; extern ao_plugin_functions_t audio_plugin_surround; extern ao_plugin_functions_t audio_plugin_resample; +extern ao_plugin_functions_t audio_plugin_volume; #define AO_PLUGINS { \ @@ -63,6 +66,7 @@ extern ao_plugin_functions_t audio_plugin_resample; &audio_plugin_format, \ &audio_plugin_surround, \ &audio_plugin_resample, \ + &audio_plugin_volume, \ NULL \ } #endif /* PLUGIN */ diff --git a/libao2/pl_volume.c b/libao2/pl_volume.c new file mode 100644 index 0000000000..8c31cae92f --- /dev/null +++ b/libao2/pl_volume.c @@ -0,0 +1,133 @@ +/* This audio output plugin changes the volume of the sound, and can + be used when the mixer doesn't support the PCM channel. The volume + is set in fixed steps between 0 - 2^8. */ + +#define PLUGIN + +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <inttypes.h> + +#include "audio_out.h" +#include "audio_plugin.h" +#include "audio_plugin_internal.h" +#include "afmt.h" + +static ao_info_t info = +{ + "Volume control audio plugin", + "volume", + "Anders", + "" +}; + +LIBAO_PLUGIN_EXTERN(volume) + +// local data +typedef struct pl_volume_s +{ + uint16_t volume; // output volume level + int inuse; // This plugin is in use TRUE, FALSE + int format; // sample fomat +} pl_volume_t; + +static pl_volume_t pl_volume={0,0,0}; + +// to set/get/query special features/parameters +static int control(int cmd,int arg){ + switch(cmd){ + case AOCONTROL_PLUGIN_SET_LEN: + return CONTROL_OK; + case AOCONTROL_GET_VOLUME:{ + if(pl_volume.inuse){ + ((ao_control_vol_t *)arg)->right=((float)pl_volume.volume)/2.55; + ((ao_control_vol_t *)arg)->left=((float)pl_volume.volume)/2.55; + return CONTROL_OK; + } + else + return CONTROL_ERROR; + } + case AOCONTROL_SET_VOLUME:{ + if(pl_volume.inuse){ + // Calculate avarage between left and right + float vol =2.55*((((ao_control_vol_t *)arg)->right)+(((ao_control_vol_t *)arg)->left))/2; + pl_volume.volume=(uint16_t)vol; + // Volume must be between 0 and 255 + if(vol > 255) + pl_volume.volume = 0xFF; + if(vol < 0) + pl_volume.volume = 0; + return CONTROL_OK; + } + else + return CONTROL_ERROR; + } + } + return CONTROL_UNKNOWN; +} + +// open & setup audio device +// return: 1=success 0=fail +static int init(){ + // Sanity sheck this plugin supports AFMT_U8 and AFMT_S16_LE + switch(ao_plugin_data.format){ + case(AFMT_U8): + case(AFMT_S16_LE): + break; + default: + fprintf(stderr,"[pl_volume] Audio format not yet suported \n"); + return 0; + } + // Initialize volume to this value + pl_volume.volume=ao_plugin_cfg.pl_volume_volume; + pl_volume.format=ao_plugin_data.format; + /* The inuse flag is used in control to detremine if the return + value since that function always is called from ao_plugin regardless + of wether this plugin is in use or not. */ + pl_volume.inuse=1; + // Tell the world what we are up to + printf("[pl_volume] Software volume control in use.\n"); + return 1; +} + +// close plugin +static void uninit(){ + pl_volume.inuse=0; +} + +// empty buffers +static void reset(){ +} + +// processes 'ao_plugin_data.len' bytes of 'data' +// called for every block of data +static int play(){ + register int i=0; + // Change the volume. + switch(pl_volume.format){ + case(AFMT_U8):{ + register uint8_t* data=(uint8_t*)ao_plugin_data.data; + for(i=0;i<ao_plugin_data.len;i++){ + data[i]=(((data[i]-128) * pl_volume.volume) >> 8) + 128; + } + break; + } + case(AFMT_S16_LE):{ + register int len=ao_plugin_data.len>>1; + register int16_t* data=(int16_t*)ao_plugin_data.data; + for(i=0;i<len;i++) + data[i]=(data[i]* pl_volume.volume)>>8; + break; + } + default: + return 0; + } + return 1; + +} + + + + + |