Beispiel #1
0
/*
 * Writes the tag entry.
 *
 * The tag entry is the tag id, the tag type,
 * the count and the offset.
 *
 * The offset is the on the amount of data writen so far, as one
 * can't predict the total bytes that the tag entries will take.
 * This means those fields requires being updated later.
 */
static void
gst_exif_writer_write_tag_header (GstExifWriter * writer,
    guint16 exif_tag, guint16 exif_type, guint32 count, guint32 offset,
    gboolean is_data)
{
  GST_DEBUG ("Writing tag entry: id %x, type %u, count %u, offset %u",
      exif_tag, exif_type, count, offset);

  if (writer->byte_order == G_LITTLE_ENDIAN) {
    gst_byte_writer_put_uint16_le (&writer->tagwriter, exif_tag);
    gst_byte_writer_put_uint16_le (&writer->tagwriter, exif_type);
    gst_byte_writer_put_uint32_le (&writer->tagwriter, count);
    gst_byte_writer_put_uint32_le (&writer->tagwriter, offset);
  } else if (writer->byte_order == G_BIG_ENDIAN) {
    gst_byte_writer_put_uint16_be (&writer->tagwriter, exif_tag);
    gst_byte_writer_put_uint16_be (&writer->tagwriter, exif_type);
    gst_byte_writer_put_uint32_be (&writer->tagwriter, count);
    if (is_data) {
      gst_byte_writer_put_uint32_le (&writer->tagwriter, offset);
    } else {
      gst_byte_writer_put_uint32_be (&writer->tagwriter, offset);
    }
  } else {
    g_assert_not_reached ();
  }

  writer->tags_total++;
}
Beispiel #2
0
/**
 * gst_tag_list_to_exif_buffer_with_tiff_header:
 * @taglist: The taglist
 *
 * Formats the tags in taglist into exif structure, a tiff header
 * is put in the beginning of the buffer.
 *
 * Returns: A GstBuffer containing the data
 *
 * Since: 0.10.30
 */
GstBuffer *
gst_tag_list_to_exif_buffer_with_tiff_header (const GstTagList * taglist)
{
  GstBuffer *ifd;
  GstByteWriter writer;
  guint size;

  ifd = gst_tag_list_to_exif_buffer (taglist, G_BYTE_ORDER, 8);
  if (ifd == NULL) {
    GST_WARNING ("Failed to create exif buffer");
    return NULL;
  }
  size = TIFF_HEADER_SIZE + GST_BUFFER_SIZE (ifd);

  /* TODO what is the correct endianness here? */
  gst_byte_writer_init_with_size (&writer, size, FALSE);
  /* TIFF header */
  if (G_BYTE_ORDER == G_LITTLE_ENDIAN) {
    gst_byte_writer_put_uint16_le (&writer, TIFF_LITTLE_ENDIAN);
    gst_byte_writer_put_uint16_le (&writer, 42);
    gst_byte_writer_put_uint32_le (&writer, 8);
  } else {
    gst_byte_writer_put_uint16_be (&writer, TIFF_BIG_ENDIAN);
    gst_byte_writer_put_uint16_be (&writer, 42);
    gst_byte_writer_put_uint32_be (&writer, 8);
  }
  if (!gst_byte_writer_put_data (&writer, GST_BUFFER_DATA (ifd),
          GST_BUFFER_SIZE (ifd))) {
    GST_WARNING ("Byte writer size mismatch");
    /* reaching here is a programming error because we should have a buffer
     * large enough */
    g_assert_not_reached ();
    gst_buffer_unref (ifd);
    gst_byte_writer_reset (&writer);
    return NULL;
  }
  gst_buffer_unref (ifd);
  return gst_byte_writer_reset_and_get_buffer (&writer);
}
static GstBuffer *
gst_opus_enc_create_id_buffer (gint nchannels, gint n_stereo_streams,
    gint sample_rate, guint8 channel_mapping_family,
    const guint8 * channel_mapping)
{
  GstBuffer *buffer;
  GstByteWriter bw;
  gboolean hdl = TRUE;

  g_return_val_if_fail (nchannels > 0 && nchannels < 256, NULL);
  g_return_val_if_fail (n_stereo_streams >= 0, NULL);
  g_return_val_if_fail (n_stereo_streams <= nchannels - n_stereo_streams, NULL);

  gst_byte_writer_init (&bw);

  /* See http://wiki.xiph.org/OggOpus */
  hdl &= gst_byte_writer_put_data (&bw, (const guint8 *) "OpusHead", 8);
  hdl &= gst_byte_writer_put_uint8 (&bw, 0x01); /* version number */
  hdl &= gst_byte_writer_put_uint8 (&bw, nchannels);
  hdl &= gst_byte_writer_put_uint16_le (&bw, 0);        /* pre-skip */
  hdl &= gst_byte_writer_put_uint32_le (&bw, sample_rate);
  hdl &= gst_byte_writer_put_uint16_le (&bw, 0);        /* output gain */
  hdl &= gst_byte_writer_put_uint8 (&bw, channel_mapping_family);
  if (channel_mapping_family > 0) {
    hdl &= gst_byte_writer_put_uint8 (&bw, nchannels - n_stereo_streams);
    hdl &= gst_byte_writer_put_uint8 (&bw, n_stereo_streams);
    hdl &= gst_byte_writer_put_data (&bw, channel_mapping, nchannels);
  }

  if (!hdl)
    GST_WARNING ("Error creating header");

  buffer = gst_byte_writer_reset_and_get_buffer (&bw);

  GST_BUFFER_OFFSET (buffer) = 0;
  GST_BUFFER_OFFSET_END (buffer) = 0;

  return buffer;
}
Beispiel #4
0
static GstBuffer *
write_exif_ifd (const GstTagList * taglist, gboolean byte_order,
    guint32 base_offset, const GstExifTagMatch * tag_map)
{
  GstExifWriter writer;
  gint i;

  GST_DEBUG ("Formatting taglist %p as exif buffer. Byte order: %d, "
      "base_offset: %u", taglist, byte_order, base_offset);

  g_assert (byte_order == G_LITTLE_ENDIAN || byte_order == G_BIG_ENDIAN);

  if (!gst_tag_list_has_ifd_tags (taglist, tag_map)) {
    GST_DEBUG ("No tags for this ifd");
    return NULL;
  }

  gst_exif_writer_init (&writer, byte_order);

  /* write tag number as 0 */
  gst_byte_writer_put_uint16_le (&writer.tagwriter, 0);

  /* write both tag headers and data
   * in ascending id order */

  for (i = 0; tag_map[i].exif_tag != 0; i++) {

    /* special cases have NULL gst tag */
    if (tag_map[i].gst_tag == NULL) {
      GstBuffer *inner_ifd = NULL;
      const GstExifTagMatch *inner_tag_map = NULL;

      GST_LOG ("Inner ifd tag: %x", tag_map[i].exif_tag);

      if (tag_map[i].exif_tag == EXIF_GPS_IFD_TAG) {
        inner_tag_map = tag_map_gps;
      }

      if (inner_tag_map) {
        /* The base offset for this inner ifd is the sum of:
         * - the current base offset
         * - the total tag data of current this ifd
         * - the total data of the current ifd
         * - its own tag entry length still to be writen (12)
         * - 4 bytes for the next ifd entry still to be writen
         */
        inner_ifd = write_exif_ifd (taglist, byte_order, base_offset +
            gst_byte_writer_get_size (&writer.tagwriter) +
            gst_byte_writer_get_size (&writer.datawriter) + 12 + 4,
            inner_tag_map);
      }

      if (inner_ifd) {
        GST_DEBUG ("Adding inner ifd: %x", tag_map[i].exif_tag);
        gst_exif_writer_write_tag_header (&writer, tag_map[i].exif_tag,
            EXIF_TYPE_LONG, 1,
            gst_byte_writer_get_size (&writer.datawriter), FALSE);
        gst_byte_writer_put_data (&writer.datawriter,
            GST_BUFFER_DATA (inner_ifd), GST_BUFFER_SIZE (inner_ifd));
        gst_buffer_unref (inner_ifd);
      }
      continue;
    }

    GST_LOG ("Checking tag %s", tag_map[i].gst_tag);
    if (gst_tag_list_get_value_index (taglist, tag_map[i].gst_tag, 0) == NULL)
      continue;

    write_exif_tag_from_taglist (&writer, taglist, &tag_map[i]);
  }

  /* Add the next IFD offset, we just set it to 0 because
   * there is no easy way to predict what it is going to be.
   * The user might rewrite the value if needed */
  gst_byte_writer_put_uint32_le (&writer.tagwriter, 0);

  /* write the number of tags */
  gst_byte_writer_set_pos (&writer.tagwriter, 0);
  if (writer.byte_order == G_LITTLE_ENDIAN)
    gst_byte_writer_put_uint16_le (&writer.tagwriter, writer.tags_total);
  else
    gst_byte_writer_put_uint16_be (&writer.tagwriter, writer.tags_total);

  /* now that we know the tag headers size, we can add the offsets */
  gst_exif_tag_rewrite_offsets (&writer, base_offset);

  return gst_exif_writer_reset_and_get_buffer (&writer);
}
static gboolean
flx_decode_delta_flc (GstFlxDec * flxdec, GstByteReader * reader,
    GstByteWriter * writer)
{
  guint16 lines, start_l;

  g_return_val_if_fail (flxdec != NULL, FALSE);
  g_return_val_if_fail (flxdec->delta_data != NULL, FALSE);

  /* use last frame for delta */
  if (!gst_byte_writer_put_data (writer, flxdec->delta_data, flxdec->size))
    goto error;
  if (!gst_byte_reader_get_uint16_le (reader, &lines))
    goto error;

  if (lines > flxdec->hdr.height) {
    GST_ERROR_OBJECT (flxdec, "Invalid FLC packet detected. too many lines.");
    return FALSE;
  }

  start_l = lines;

  while (lines) {
    guint16 opcode;

    if (!gst_byte_writer_set_pos (writer,
            flxdec->hdr.width * (start_l - lines)))
      goto error;

    /* process opcode(s) */
    while (TRUE) {
      if (!gst_byte_reader_get_uint16_le (reader, &opcode))
        goto error;
      if ((opcode & 0xc000) == 0)
        break;

      if ((opcode & 0xc000) == 0xc000) {
        /* line skip count */
        gulong skip = (0x10000 - opcode);
        if (skip > flxdec->hdr.height) {
          GST_ERROR_OBJECT (flxdec, "Invalid FLC packet detected. "
              "skip line count too big.");
          return FALSE;
        }
        start_l += skip;
        if (!gst_byte_writer_set_pos (writer,
                gst_byte_writer_get_pos (writer) + flxdec->hdr.width * skip))
          goto error;
      } else {
        /* last pixel */
        if (!gst_byte_writer_set_pos (writer,
                gst_byte_writer_get_pos (writer) + flxdec->hdr.width))
          goto error;
        if (!gst_byte_writer_put_uint8 (writer, opcode & 0xff))
          goto error;
      }
    }

    /* last opcode is the packet count */
    GST_LOG_OBJECT (flxdec, "have %d packets", opcode);
    while (opcode--) {
      /* skip count */
      guint8 skip;
      gint8 count;

      if (!gst_byte_reader_get_uint8 (reader, &skip))
        goto error;
      if (!gst_byte_writer_set_pos (writer,
              gst_byte_writer_get_pos (writer) + skip))
        goto error;

      /* RLE count */
      if (!gst_byte_reader_get_int8 (reader, &count))
        goto error;

      if (count < 0) {
        guint16 x;

        /* replicate word run */
        count = ABS (count);

        GST_LOG_OBJECT (flxdec, "have replicate run of size %d at offset %d",
            count, skip);

        if (skip + count > flxdec->hdr.width) {
          GST_ERROR_OBJECT (flxdec, "Invalid FLC packet detected. "
              "line too long.");
          return FALSE;
        }

        if (!gst_byte_reader_get_uint16_le (reader, &x))
          goto error;

        while (count--) {
          if (!gst_byte_writer_put_uint16_le (writer, x)) {
            goto error;
          }
        }
      } else {
        GST_LOG_OBJECT (flxdec, "have literal run of size %d at offset %d",
            count, skip);

        if (skip + count > flxdec->hdr.width) {
          GST_ERROR_OBJECT (flxdec, "Invalid FLC packet detected. "
              "line too long.");
          return FALSE;
        }

        while (count--) {
          guint16 x;

          if (!gst_byte_reader_get_uint16_le (reader, &x))
            goto error;
          if (!gst_byte_writer_put_uint16_le (writer, x))
            goto error;
        }
      }
    }
    lines--;
  }

  return TRUE;

error:
  GST_ERROR_OBJECT (flxdec, "Failed to decode FLI packet");
  return FALSE;
}