C++ (Cpp) gst_bit_reader_peek_bits_uint8_unchecked示例

示例#1

文件： gstac3parse.c 项目： nnikos123/gst-plugins-good

static gboolean
gst_ac3_parse_frame_header (GstAc3Parse * parse, GstBuffer * buf, gint skip,
    guint * framesize, guint * rate, guint * chans, guint * blocks,
    guint * sid, gboolean * eac)
{
  GstBitReader bits;
  guint16 sync;
  guint8 bsid;
  GstMapInfo map;
  gboolean ret = FALSE;

  gst_buffer_map (buf, &map, GST_MAP_READ);
  gst_bit_reader_init (&bits, map.data, map.size);

  GST_MEMDUMP_OBJECT (parse, "AC3 frame sync", map.data, MIN (map.size, 16));

  gst_bit_reader_skip_unchecked (&bits, skip * 8);

  sync = gst_bit_reader_get_bits_uint16_unchecked (&bits, 16);
  gst_bit_reader_skip_unchecked (&bits, 16 + 8);
  bsid = gst_bit_reader_peek_bits_uint8_unchecked (&bits, 5);

  if (G_UNLIKELY (sync != 0x0b77))
    goto cleanup;

  GST_LOG_OBJECT (parse, "bsid = %d", bsid);

  if (bsid <= 10) {
    if (eac)
      *eac = FALSE;
    ret = gst_ac3_parse_frame_header_ac3 (parse, buf, skip, framesize, rate,
        chans, blocks, sid);
    goto cleanup;
  } else if (bsid <= 16) {
    if (eac)
      *eac = TRUE;
    ret = gst_ac3_parse_frame_header_eac3 (parse, buf, skip, framesize, rate,
        chans, blocks, sid);
    goto cleanup;
  } else {
    GST_DEBUG_OBJECT (parse, "unexpected bsid %d", bsid);
    ret = FALSE;
    goto cleanup;
  }

  GST_DEBUG_OBJECT (parse, "unexpected bsid %d", bsid);

cleanup:
  gst_buffer_unmap (buf, &map);

  return ret;
}

示例#2

文件： gstac3parse.c 项目： freedesktop-unofficial-mirror/gstreamer-sdk__gst-plugins-good

static gboolean
gst_ac3_parse_frame_header (GstAc3Parse * parse, GstBuffer * buf, gint skip,
    guint * framesize, guint * rate, guint * chans, guint * blocks,
    guint * sid, gboolean * eac)
{
  GstBitReader bits = GST_BIT_READER_INIT_FROM_BUFFER (buf);
  guint16 sync;
  guint8 bsid;

  GST_MEMDUMP_OBJECT (parse, "AC3 frame sync", GST_BUFFER_DATA (buf), 16);

  gst_bit_reader_skip_unchecked (&bits, skip * 8);

  sync = gst_bit_reader_get_bits_uint16_unchecked (&bits, 16);
  gst_bit_reader_skip_unchecked (&bits, 16 + 8);
  bsid = gst_bit_reader_peek_bits_uint8_unchecked (&bits, 5);

  if (G_UNLIKELY (sync != 0x0b77))
    return FALSE;

  GST_LOG_OBJECT (parse, "bsid = %d", bsid);

  if (bsid <= 10) {
    if (eac)
      *eac = FALSE;
    return gst_ac3_parse_frame_header_ac3 (parse, buf, skip, framesize, rate,
        chans, blocks, sid);
  } else if (bsid <= 16) {
    if (eac)
      *eac = TRUE;
    return gst_ac3_parse_frame_header_eac3 (parse, buf, skip, framesize, rate,
        chans, blocks, sid);
  } else {
    GST_DEBUG_OBJECT (parse, "unexpected bsid %d", bsid);
    return FALSE;
  }
}