C++ (Cpp) GST_AUDIO_INFO_IS_FLOAT Beispiele

Beispiel #1

Datei: gstwavenc.c Projekt: collects/gst-plugins-good

static gboolean
gst_wavenc_sink_setcaps (GstPad * pad, GstCaps * caps)
{
  GstWavEnc *wavenc;
  GstStructure *structure;
  const gchar *name;
  gint chans, rate;
  GstCaps *ccaps;

  wavenc = GST_WAVENC (gst_pad_get_parent (pad));

  ccaps = gst_pad_get_current_caps (pad);
  if (wavenc->sent_header && ccaps && !gst_caps_can_intersect (caps, ccaps)) {
    gst_caps_unref (ccaps);
    GST_WARNING_OBJECT (wavenc, "cannot change format in middle of stream");
    goto fail;
  }
  if (ccaps)
    gst_caps_unref (ccaps);

  GST_DEBUG_OBJECT (wavenc, "got caps: %" GST_PTR_FORMAT, caps);

  structure = gst_caps_get_structure (caps, 0);
  name = gst_structure_get_name (structure);

  if (!gst_structure_get_int (structure, "channels", &chans) ||
      !gst_structure_get_int (structure, "rate", &rate)) {
    GST_WARNING_OBJECT (wavenc, "caps incomplete");
    goto fail;
  }

  if (strcmp (name, "audio/x-raw") == 0) {
    GstAudioInfo info;

    if (!gst_audio_info_from_caps (&info, caps))
      goto fail;

    if (GST_AUDIO_INFO_IS_INTEGER (&info))
      wavenc->format = GST_RIFF_WAVE_FORMAT_PCM;
    else if (GST_AUDIO_INFO_IS_FLOAT (&info))
      wavenc->format = GST_RIFF_WAVE_FORMAT_IEEE_FLOAT;
    else
      goto fail;

    wavenc->width = GST_AUDIO_INFO_WIDTH (&info);
  } else if (strcmp (name, "audio/x-alaw") == 0) {
    wavenc->format = GST_RIFF_WAVE_FORMAT_ALAW;
    wavenc->width = 8;
  } else if (strcmp (name, "audio/x-mulaw") == 0) {
    wavenc->format = GST_RIFF_WAVE_FORMAT_MULAW;
    wavenc->width = 8;
  } else {
    GST_WARNING_OBJECT (wavenc, "Unsupported format %s", name);
    goto fail;
  }

  wavenc->channels = chans;
  wavenc->rate = rate;

  GST_LOG_OBJECT (wavenc,
      "accepted caps: format=0x%04x chans=%u width=%u rate=%u",
      wavenc->format, wavenc->channels, wavenc->width, wavenc->rate);

  gst_object_unref (wavenc);
  return TRUE;

fail:
  gst_object_unref (wavenc);
  return FALSE;
}

Beispiel #2

Datei: gstosxaudioringbuffer.c Projekt: DylanZA/gst-plugins-good

static gboolean
gst_osx_audio_ring_buffer_acquire (GstAudioRingBuffer * buf,
    GstAudioRingBufferSpec * spec)
{
  gboolean ret = FALSE, is_passthrough = FALSE;
  GstOsxAudioRingBuffer *osxbuf;
  AudioStreamBasicDescription format;

  osxbuf = GST_OSX_AUDIO_RING_BUFFER (buf);

  if (RINGBUFFER_IS_SPDIF (spec->type)) {
    format.mFormatID = kAudioFormat60958AC3;
    format.mSampleRate = (double) GST_AUDIO_INFO_RATE (&spec->info);
    format.mChannelsPerFrame = 2;
    format.mFormatFlags = kAudioFormatFlagIsSignedInteger |
        kAudioFormatFlagIsPacked | kAudioFormatFlagIsNonMixable;
    format.mBytesPerFrame = 0;
    format.mBitsPerChannel = 16;
    format.mBytesPerPacket = 6144;
    format.mFramesPerPacket = 1536;
    format.mReserved = 0;
    spec->segsize = 6144;
    spec->segtotal = 10;
    is_passthrough = TRUE;
  } else {
    int width, depth;
    /* Fill out the audio description we're going to be using */
    format.mFormatID = kAudioFormatLinearPCM;
    format.mSampleRate = (double) GST_AUDIO_INFO_RATE (&spec->info);
    format.mChannelsPerFrame = GST_AUDIO_INFO_CHANNELS (&spec->info);
    if (GST_AUDIO_INFO_IS_FLOAT (&spec->info)) {
      format.mFormatFlags = kAudioFormatFlagsNativeFloatPacked;
      width = depth = GST_AUDIO_INFO_WIDTH (&spec->info);
    } else {
      format.mFormatFlags = kAudioFormatFlagIsSignedInteger;
      width = GST_AUDIO_INFO_WIDTH (&spec->info);
      depth = GST_AUDIO_INFO_DEPTH (&spec->info);
      if (width == depth) {
        format.mFormatFlags |= kAudioFormatFlagIsPacked;
      } else {
        format.mFormatFlags |= kAudioFormatFlagIsAlignedHigh;
      }
    }

    if (GST_AUDIO_INFO_IS_BIG_ENDIAN (&spec->info)) {
      format.mFormatFlags |= kAudioFormatFlagIsBigEndian;
    }

    format.mBytesPerFrame = GST_AUDIO_INFO_BPF (&spec->info);
    format.mBitsPerChannel = depth;
    format.mBytesPerPacket = GST_AUDIO_INFO_BPF (&spec->info);
    format.mFramesPerPacket = 1;
    format.mReserved = 0;
    spec->segsize =
        (spec->latency_time * GST_AUDIO_INFO_RATE (&spec->info) /
        G_USEC_PER_SEC) * GST_AUDIO_INFO_BPF (&spec->info);
    spec->segtotal = spec->buffer_time / spec->latency_time;
    is_passthrough = FALSE;
  }

  GST_DEBUG_OBJECT (osxbuf, "Format: " CORE_AUDIO_FORMAT,
      CORE_AUDIO_FORMAT_ARGS (format));

  /* gst_audio_ring_buffer_set_channel_positions is not called
   * since the AUs perform channel reordering themselves.
   * (see gst_core_audio_set_channel_layout) */

  buf->size = spec->segtotal * spec->segsize;
  buf->memory = g_malloc0 (buf->size);

  ret = gst_core_audio_initialize (osxbuf->core_audio, format, spec->caps,
      is_passthrough);

  if (!ret) {
    g_free (buf->memory);
    buf->memory = NULL;
    buf->size = 0;
  }

  osxbuf->segoffset = 0;

  return ret;
}