static void
gst_exif_writer_init (GstExifWriter * writer, gint byte_order)
{
gst_byte_writer_init (&writer->tagwriter);
gst_byte_writer_init (&writer->datawriter);
writer->byte_order = byte_order;
writer->tags_total = 0;
if (writer->byte_order != G_LITTLE_ENDIAN &&
writer->byte_order != G_BIG_ENDIAN) {
GST_WARNING ("Unexpected byte order %d, using system default: %d",
writer->byte_order, G_BYTE_ORDER);
writer->byte_order = G_BYTE_ORDER;
}
}
/**
* gst_byte_writer_init_with_size:
* @writer: #GstByteWriter instance
* @size: Initial size of data
* @fixed: If %TRUE the data can't be reallocated
*
* Initializes @writer with the given initial data size.
*
* Since: 0.10.26
*/
void
gst_byte_writer_init_with_size (GstByteWriter * writer, guint size,
gboolean fixed)
{
g_return_if_fail (writer != NULL);
gst_byte_writer_init (writer);
writer->parent.data = g_malloc (size);
writer->alloc_size = size;
writer->fixed = fixed;
writer->owned = TRUE;
}
/**
* gst_byte_writer_init_with_data:
* @writer: #GstByteWriter instance
* @data: Memory area for writing
* @size: Size of @data in bytes
* @initialized: If %TRUE the complete data can be read from the beginning
*
* Initializes @writer with the given
* memory area. If @initialized is %TRUE it is possible to
* read @size bytes from the #GstByteWriter from the beginning.
*
* Since: 0.10.26
*/
void
gst_byte_writer_init_with_data (GstByteWriter * writer, guint8 * data,
guint size, gboolean initialized)
{
g_return_if_fail (writer != NULL);
gst_byte_writer_init (writer);
writer->parent.data = data;
writer->parent.size = (initialized) ? size : 0;
writer->alloc_size = size;
writer->fixed = TRUE;
writer->owned = FALSE;
}
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;
}
