C++ (Cpp) gst_wildmidi_clip_buffer Examples

Example #1

/* generate audio data and advance internal timers */
static GstBuffer *
gst_wildmidi_get_buffer (GstWildmidi * wildmidi)
{
  size_t size;
  gint64 samples;
  GstBuffer *buffer;
  GstSegment *segment;
  GstMapInfo info;
  guint bpf;

  bpf = wildmidi->bytes_per_frame;

  buffer = gst_buffer_new_and_alloc (256 * bpf);

  gst_buffer_map (buffer, &info, GST_MAP_READWRITE);

  GST_OBJECT_LOCK (wildmidi);
  size = WildMidi_GetOutput (wildmidi->song, (gpointer) info.data,
      (unsigned long int) info.size);
  GST_OBJECT_UNLOCK (wildmidi);

  gst_buffer_unmap (buffer, &info);

  if (size == 0) {
    gst_buffer_unref (buffer);
    return NULL;
  }

  /* adjust buffer size */
  gst_buffer_resize (buffer, 0, size);

  segment = wildmidi->o_segment;

  GST_BUFFER_OFFSET (buffer) = segment->position;
  GST_BUFFER_TIMESTAMP (buffer) =
      gst_util_uint64_scale_int (segment->position, GST_SECOND, WILDMIDI_RATE);

  samples = size / bpf;
  segment->position += samples;

  GST_BUFFER_OFFSET_END (buffer) = segment->position;
  GST_BUFFER_DURATION (buffer) =
      gst_util_uint64_scale_int (segment->position, GST_SECOND,
      WILDMIDI_RATE) - GST_BUFFER_TIMESTAMP (buffer);

  GST_DEBUG_OBJECT (wildmidi, "buffer ts: %" GST_TIME_FORMAT ", "
      "duration: %" GST_TIME_FORMAT " (%" G_GINT64_FORMAT " samples)",
      GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)),
      GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)), samples);

  return gst_wildmidi_clip_buffer (wildmidi, buffer);
}

Example #2

File: gstwildmidi.c Project: zsx/ossbuild

/* generate audio data and advance internal timers */
static GstBuffer *
gst_wildmidi_get_buffer (GstWildmidi * wildmidi)
{
  size_t bytes_read;
  gint64 samples;
  GstBuffer *buffer;
  GstSegment *segment;
  guint8 *data;
  guint size;
  guint bpf;

  bpf = wildmidi->bytes_per_frame;

  buffer = gst_buffer_new_and_alloc (256 * bpf);

  data = GST_BUFFER_DATA (buffer);
  size = GST_BUFFER_SIZE (buffer);

  GST_OBJECT_LOCK (wildmidi);
  bytes_read = WildMidi_GetOutput (wildmidi->song, (char *) data,
      (unsigned long int) size);
  GST_OBJECT_UNLOCK (wildmidi);

  if (bytes_read == 0) {
    gst_buffer_unref (buffer);
    return NULL;
  }

  /* adjust buffer size */
  size = GST_BUFFER_SIZE (buffer) = bytes_read;

  segment = wildmidi->o_segment;

  GST_BUFFER_OFFSET (buffer) = segment->last_stop;
  GST_BUFFER_TIMESTAMP (buffer) =
      gst_util_uint64_scale_int (segment->last_stop, GST_SECOND, WILDMIDI_RATE);

  samples = size / bpf;
  segment->last_stop += samples;

  GST_BUFFER_OFFSET_END (buffer) = segment->last_stop;
  GST_BUFFER_DURATION (buffer) =
      gst_util_uint64_scale_int (segment->last_stop, GST_SECOND,
      WILDMIDI_RATE) - GST_BUFFER_TIMESTAMP (buffer);

  GST_DEBUG_OBJECT (wildmidi, "buffer ts: %" GST_TIME_FORMAT ", "
      "duration: %" GST_TIME_FORMAT " (%" G_GINT64_FORMAT " samples)",
      GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)),
      GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)), samples);

  return gst_wildmidi_clip_buffer (wildmidi, buffer);
}