visualization.h File Reference

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Macros
#define	AUDIO_VISUALIZATION_SAMPLE_RATE   48000
#define	AUDIO_VISUALIZATION_COLOR_STANDARD   0
#define	AUDIO_VISUALIZATION_COLOR_DARKER   1
#define	AUDIO_VISUALIZATION_COLOR_BRIGHTER   2

Enumerations
enum	audio_visualization_source_t {   AUDIO_VISUALIZATION_SOURCE_MIC = 0 , AUDIO_VISUALIZATION_SOURCE_MEDIA , AUDIO_VISUALIZATION_SOURCE_REMOTE , AUDIO_VISUALIZATION_SOURCE_LOCAL_MIX ,   AUDIO_VISUALIZATION_SOURCE_MIX , AUDIO_VISUALIZATION_SOURCE_COUNT }

Functions
void	audio_visualization_submit (audio_visualization_source_t source, const float *samples, size_t count)
void	audio_visualization_submit_stereo (audio_visualization_source_t source, const float *samples, size_t count)
void	audio_visualization_read (audio_visualization_source_t source, float *samples, size_t count)

Macro Definition Documentation

AUDIO_VISUALIZATION_COLOR_BRIGHTER

#define AUDIO_VISUALIZATION_COLOR_BRIGHTER   2

Definition at line 18 of file visualization.h.

Referenced by mirror_render_audio_visualization(), and visualization_color_for_level().

AUDIO_VISUALIZATION_COLOR_DARKER

#define AUDIO_VISUALIZATION_COLOR_DARKER   1

Definition at line 17 of file visualization.h.

Referenced by visualization_color_for_level().

AUDIO_VISUALIZATION_COLOR_STANDARD

#define AUDIO_VISUALIZATION_COLOR_STANDARD   0

Definition at line 16 of file visualization.h.

AUDIO_VISUALIZATION_SAMPLE_RATE

#define AUDIO_VISUALIZATION_SAMPLE_RATE   48000

Definition at line 14 of file visualization.h.

Referenced by audio_visualization_render_fft().

Enumeration Type Documentation

audio_visualization_source_t

enum audio_visualization_source_t

Enumerator
AUDIO_VISUALIZATION_SOURCE_MIC
AUDIO_VISUALIZATION_SOURCE_MEDIA
AUDIO_VISUALIZATION_SOURCE_REMOTE
AUDIO_VISUALIZATION_SOURCE_LOCAL_MIX
AUDIO_VISUALIZATION_SOURCE_MIX
AUDIO_VISUALIZATION_SOURCE_COUNT

Definition at line 5 of file visualization.h.

             {
  AUDIO_VISUALIZATION_SOURCE_MIC = 0,
  AUDIO_VISUALIZATION_SOURCE_MEDIA,
  AUDIO_VISUALIZATION_SOURCE_REMOTE,
  AUDIO_VISUALIZATION_SOURCE_LOCAL_MIX,
  AUDIO_VISUALIZATION_SOURCE_MIX,
  AUDIO_VISUALIZATION_SOURCE_COUNT
} audio_visualization_source_t;

Function Documentation

audio_visualization_read()

void audio_visualization_read	(	audio_visualization_source_t	source,
		float *	samples,
		size_t	count )

Definition at line 108 of file visualization.c.

                                                                                                 {
  if (!samples)
    return;
  if (source < AUDIO_VISUALIZATION_SOURCE_MIC || source >= AUDIO_VISUALIZATION_SOURCE_COUNT) {
    memset(samples, 0, count * sizeof(float));
    return;
  }
  static_mutex_lock_named(&history_mutex, "audio_visualization_history");
  size_t available_count = count < VISUALIZATION_HISTORY ? count : VISUALIZATION_HISTORY;
  size_t output_offset = count - available_count;
  for (size_t i = 0; i < count; i++)
    samples[i] = 0.0f;
  size_t first_source = source;
  size_t last_source = source;
  if (source == AUDIO_VISUALIZATION_SOURCE_MIX) {
    first_source = AUDIO_VISUALIZATION_SOURCE_MIC;
    last_source = AUDIO_VISUALIZATION_SOURCE_REMOTE;
  } else if (source == AUDIO_VISUALIZATION_SOURCE_LOCAL_MIX) {
    first_source = AUDIO_VISUALIZATION_SOURCE_MIC;
    last_source = AUDIO_VISUALIZATION_SOURCE_MEDIA;
  }
  for (size_t current = first_source; current <= last_source; current++) {
    size_t start = (write_position[current] + VISUALIZATION_HISTORY - available_count) % VISUALIZATION_HISTORY;
    for (size_t i = 0; i < available_count; i++)
      samples[output_offset + i] += history[current][(start + i) % VISUALIZATION_HISTORY];
  }
  static_mutex_unlock(&history_mutex);
  for (size_t i = 0; i < count; i++)
    samples[i] = fmaxf(-1.0f, fminf(1.0f, samples[i]));
}

References AUDIO_VISUALIZATION_SOURCE_COUNT, AUDIO_VISUALIZATION_SOURCE_LOCAL_MIX, AUDIO_VISUALIZATION_SOURCE_MEDIA, AUDIO_VISUALIZATION_SOURCE_MIC, AUDIO_VISUALIZATION_SOURCE_MIX, AUDIO_VISUALIZATION_SOURCE_REMOTE, source, and VISUALIZATION_HISTORY.

Referenced by audio_visualization_render_fft(), and audio_visualization_render_waveform().

audio_visualization_submit()

void audio_visualization_submit	(	audio_visualization_source_t	source,
		const float *	samples,
		size_t	count )

Definition at line 93 of file visualization.c.

                                                                                                         {
  if ((!GET_OPTION(waveform) && !GET_OPTION(fft)) || !samples || source < AUDIO_VISUALIZATION_SOURCE_MIC ||
      source > AUDIO_VISUALIZATION_SOURCE_REMOTE)
    return;
  static_mutex_lock_named(&history_mutex, "audio_visualization_history");
  size_t position = write_position[source];
  for (size_t i = 0; i < count; i++) {
    float sample = samples[i];
    history[source][position] = isfinite(sample) ? fmaxf(-1.0f, fminf(1.0f, sample)) : 0.0f;
    position = (position + 1) % VISUALIZATION_HISTORY;
  }
  write_position[source] = position;
  static_mutex_unlock(&history_mutex);
}

References AUDIO_VISUALIZATION_SOURCE_MIC, AUDIO_VISUALIZATION_SOURCE_REMOTE, GET_OPTION, source, and VISUALIZATION_HISTORY.

Referenced by audio_visualization_submit_stereo(), and mirror_submit_audio_samples().

audio_visualization_submit_stereo()

void audio_visualization_submit_stereo	(	audio_visualization_source_t	source,
		const float *	samples,
		size_t	count )

Downmix interleaved stereo only for display analysis, preserving its sample clock.

Definition at line 78 of file visualization.c.

                                                                                                                {
  if (!samples || count % 2)
    return;
  float mono[480];
  for (size_t offset = 0; offset < count;) {
    size_t frames = (count - offset) / 2;
    if (frames > 480)
      frames = 480;
    for (size_t i = 0; i < frames; i++)
      mono[i] = samples[offset + i * 2] * 0.5f + samples[offset + i * 2 + 1] * 0.5f;
    audio_visualization_submit(source, mono, frames);
    offset += frames * 2;
  }
}

References audio_visualization_submit(), and source.

Referenced by audio_write_samples().