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Properly implement volume in warble. dB cut only.

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Change-Id: I34b77287ba0b1a0002db3d52e893a52c50593362
This commit is contained in:
Michael Sevakis 2013-04-25 23:46:17 -04:00
parent 5314fb2103
commit a2d8d4293a
2 changed files with 36 additions and 9 deletions
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1
lib/rbcodec/rbcodecconfig-example.h
View file

@ -2,7 +2,6 @@
#define RBCODECCONFIG_H_INCLUDED
#define HAVE_PITCHCONTROL
//#define HAVE_SW_VOLUME_CONTROL
#define HAVE_SW_TONE_CONTROLS
#define HAVE_ALBUMART
#define NUM_CORES 1

44
lib/rbcodec/test/warble.c
View file

@ -84,6 +84,11 @@ static bool use_dsp = true;
static bool enable_loop = false;
static const char *config = "";
/* Volume control */
#define VOL_FRACBITS 31
#define VOL_FACTOR_UNITY (1u << VOL_FRACBITS)
static uint32_t playback_vol_factor = VOL_FACTOR_UNITY;
static int input_fd;
static enum codec_command_action codec_action;
static intptr_t codec_action_param = 0;
@ -250,6 +255,33 @@ static void playback_init(void)
playback_decode_sema = SDL_CreateSemaphore(0);
}
static void playback_copy_audio_buffer_S16SYS(
void *dst, const void *src, int len)
{
int64_t factor = playback_vol_factor;
if (factor == VOL_FACTOR_UNITY) {
memcpy(dst, src, len);
} else {
const int16_t *s = src;
int16_t *d = dst;
while (len) {
*d++ = factor * *s++ >> VOL_FRACBITS;
*d++ = factor * *s++ >> VOL_FRACBITS;
len -= sizeof (int16_t) * 2;
}
}
}
static void playback_set_volume(int volume)
{
if (volume > 0)
volume = 0;
playback_vol_factor = pow(10, (double)volume / 20.0) * VOL_FACTOR_UNITY;
}
static void playback_callback(void *userdata, Uint8 *stream, int len)
{
while (len > 0) {
@ -268,7 +300,8 @@ static void playback_callback(void *userdata, Uint8 *stream, int len)
}
char *play_buffer = playback_buffer[playback_play_ind];
int copy_len = MIN(len, PLAYBACK_BUFFER_SIZE - playback_play_pos);
memcpy(stream, play_buffer + playback_play_pos, copy_len);
playback_copy_audio_buffer_S16SYS(stream,
play_buffer + playback_play_pos, copy_len);
len -= copy_len;
stream += copy_len;
playback_play_pos += copy_len;
@ -360,11 +393,8 @@ static void perform_config(void)
codec_action_param = atoi(val);
} else if (!strncmp(name, "tempo=", 6)) {
dsp_set_timestretch(atof(val) * PITCH_SPEED_100);
#ifdef HAVE_SW_VOLUME_CONTROL
} else if (!strncmp(name, "vol=", 4)) {
global_settings.volume = atoi(val);
dsp_callback(DSP_CALLBACK_SET_SW_VOLUME, 0);
#endif
playback_set_volume(atoi(val));
} else {
fprintf(stderr, "error: unrecognized config \"%.*s\"\n",
(int)(eq - name), name);
@ -814,9 +844,7 @@ static void print_help(const char *progname)
" rate=<n> Multiply rate by <n> [1.0]\n"
" seek=<n> Seek <n> ms into the file\n"
" tempo=<n> Timestretch by <n> [1.0]\n"
#ifdef HAVE_SW_VOLUME_CONTROL
" vol=<n> Set volume to <n> dB [0]\n"
#endif
" vol=<n> Set volume attenuation to <n> dB [-0]\n"
" wait=<n> Don't apply remaining configuration until\n"
" <n> total samples have output\n"
"\n"