DCP_ASSERT (false);
}
-shared_ptr<dcp::OpenJPEGImage>
-dcp::decompress_j2k (Data data, int reduce)
-{
- return dcp::decompress_j2k (data.data.get(), data.size, reduce);
-}
-
-class ReadBuffer
-{
-public:
- ReadBuffer (uint8_t* data, int64_t size)
- : _data (data)
- , _size (size)
- , _offset (0)
- {}
-
- OPJ_SIZE_T read (void* buffer, OPJ_SIZE_T nb_bytes)
- {
- int64_t N = min (nb_bytes, _size - _offset);
- memcpy (buffer, _data + _offset, N);
- _offset += N;
- return N;
- }
-
-private:
- uint8_t* _data;
- OPJ_SIZE_T _size;
- OPJ_SIZE_T _offset;
-};
-
-static OPJ_SIZE_T
-read_function (void* buffer, OPJ_SIZE_T nb_bytes, void* data)
-{
- return reinterpret_cast<ReadBuffer*>(data)->read (buffer, nb_bytes);
-}
-
-static void
-read_free_function (void* data)
-{
- delete reinterpret_cast<ReadBuffer*>(data);
-}
-
-/** Decompress a JPEG2000 image to a bitmap.
- * @param data JPEG2000 data.
- * @param size Size of data in bytes.
- * @param reduce A power of 2 by which to reduce the size of the decoded image;
- * e.g. 0 reduces by (2^0 == 1), ie keeping the same size.
- * 1 reduces by (2^1 == 2), ie halving the size of the image.
- * This is useful for scaling 4K DCP images down to 2K.
- * @return OpenJPEGImage.
- */
-shared_ptr<dcp::OpenJPEGImage>
-dcp::decompress_j2k (uint8_t* data, int64_t size, int reduce)
-{
- uint8_t const jp2_magic[] = {
- 0x00,
- 0x00,
- 0x00,
- 0x0c,
- 'j',
- 'P',
- 0x20,
- 0x20
- };
-
- OPJ_CODEC_FORMAT format = OPJ_CODEC_J2K;
- if (size >= int (sizeof (jp2_magic)) && memcmp (data, jp2_magic, sizeof (jp2_magic)) == 0) {
- format = OPJ_CODEC_JP2;
- }
-
- opj_codec_t* decoder = opj_create_decompress (format);
- if (!decoder) {
- boost::throw_exception (DCPReadError ("could not create JPEG2000 decompresser"));
- }
- opj_dparameters_t parameters;
- opj_set_default_decoder_parameters (¶meters);
- parameters.cp_reduce = reduce;
- opj_setup_decoder (decoder, ¶meters);
-
- opj_stream_t* stream = opj_stream_default_create (OPJ_TRUE);
- if (!stream) {
- throw MiscError ("could not create JPEG2000 stream");
- }
-
- opj_stream_set_read_function (stream, read_function);
- ReadBuffer* buffer = new ReadBuffer (data, size);
- opj_stream_set_user_data (stream, buffer, read_free_function);
- opj_stream_set_user_data_length (stream, size);
-
- opj_image_t* image = 0;
- opj_read_header (stream, decoder, &image);
- if (opj_decode (decoder, stream, image) == OPJ_FALSE) {
- opj_destroy_codec (decoder);
- opj_stream_destroy (stream);
- if (format == OPJ_CODEC_J2K) {
- boost::throw_exception (DCPReadError (String::compose ("could not decode JPEG2000 codestream of %1 bytes.", size)));
- } else {
- boost::throw_exception (DCPReadError (String::compose ("could not decode JP2 file of %1 bytes.", size)));
- }
- }
-
- opj_destroy_codec (decoder);
- opj_stream_destroy (stream);
-
- image->x1 = rint (float(image->x1) / pow (2, reduce));
- image->y1 = rint (float(image->y1) / pow (2, reduce));
- return shared_ptr<OpenJPEGImage> (new OpenJPEGImage (image));
-}
-
-class WriteBuffer
-{
-public:
-/* XXX: is there a better strategy for this? */
-#define MAX_J2K_SIZE (1024 * 1024 * 2)
- WriteBuffer ()
- : _data (shared_array<uint8_t> (new uint8_t[MAX_J2K_SIZE]), MAX_J2K_SIZE)
- , _offset (0)
- {}
-
- OPJ_SIZE_T write (void* buffer, OPJ_SIZE_T nb_bytes)
- {
- DCP_ASSERT ((_offset + nb_bytes) < MAX_J2K_SIZE);
- memcpy (_data.data.get() + _offset, buffer, nb_bytes);
- _offset += nb_bytes;
- return nb_bytes;
- }
-
- Data data () const {
- return _data;
- }
-
-private:
- Data _data;
- OPJ_SIZE_T _offset;
-};
-
-static OPJ_SIZE_T
-write_function (void* buffer, OPJ_SIZE_T nb_bytes, void* data)
-{
- return reinterpret_cast<WriteBuffer*>(data)->write (buffer, nb_bytes);
-}
-
-static void
-write_free_function (void* data)
-{
- delete reinterpret_cast<WriteBuffer*>(data);
-}
-
-Data
-dcp::compress_j2k (shared_ptr<const OpenJPEGImage> xyz, int bandwidth, int frames_per_second, bool threed, bool fourk)
-{
- /* XXX: should probably use opj_set_*_handler */
-
- /* Set the max image and component sizes based on frame_rate */
- int max_cs_len = ((float) bandwidth) / 8 / frames_per_second;
- if (threed) {
- /* In 3D we have only half the normal bandwidth per eye */
- max_cs_len /= 2;
- }
- int const max_comp_size = max_cs_len / 1.25;
-
- /* get a J2K compressor handle */
- opj_codec_t* encoder = opj_create_compress (OPJ_CODEC_J2K);
- if (encoder == 0) {
- throw MiscError ("could not create JPEG2000 encoder");
- }
-
- /* Set encoding parameters to default values */
- opj_cparameters_t parameters;
- opj_set_default_encoder_parameters (¶meters);
-
- /* Set default cinema parameters */
- parameters.tile_size_on = OPJ_FALSE;
- parameters.cp_tdx = 1;
- parameters.cp_tdy = 1;
-
- /* Tile part */
- parameters.tp_flag = 'C';
- parameters.tp_on = 1;
-
- /* Tile and Image shall be at (0,0) */
- parameters.cp_tx0 = 0;
- parameters.cp_ty0 = 0;
- parameters.image_offset_x0 = 0;
- parameters.image_offset_y0 = 0;
-
- /* Codeblock size = 32x32 */
- parameters.cblockw_init = 32;
- parameters.cblockh_init = 32;
- parameters.csty |= 0x01;
-
- /* The progression order shall be CPRL */
- parameters.prog_order = OPJ_CPRL;
-
- /* No ROI */
- parameters.roi_compno = -1;
-
- parameters.subsampling_dx = 1;
- parameters.subsampling_dy = 1;
-
- /* 9-7 transform */
- parameters.irreversible = 1;
-
- parameters.tcp_rates[0] = 0;
- parameters.tcp_numlayers++;
- parameters.cp_disto_alloc = 1;
- parameters.cp_rsiz = fourk ? OPJ_CINEMA4K : OPJ_CINEMA2K;
- if (fourk) {
- parameters.numpocs = 2;
- parameters.POC[0].tile = 1;
- parameters.POC[0].resno0 = 0;
- parameters.POC[0].compno0 = 0;
- parameters.POC[0].layno1 = 1;
- parameters.POC[0].resno1 = parameters.numresolution - 1;
- parameters.POC[0].compno1 = 3;
- parameters.POC[0].prg1 = OPJ_CPRL;
- parameters.POC[1].tile = 1;
- parameters.POC[1].resno0 = parameters.numresolution - 1;
- parameters.POC[1].compno0 = 0;
- parameters.POC[1].layno1 = 1;
- parameters.POC[1].resno1 = parameters.numresolution;
- parameters.POC[1].compno1 = 3;
- parameters.POC[1].prg1 = OPJ_CPRL;
- }
-
- parameters.cp_comment = strdup ("libdcp");
- parameters.cp_cinema = fourk ? OPJ_CINEMA4K_24 : OPJ_CINEMA2K_24;
-
- /* 3 components, so use MCT */
- parameters.tcp_mct = 1;
-
- /* set max image */
- parameters.max_comp_size = max_comp_size;
- parameters.tcp_rates[0] = ((float) (3 * xyz->size().width * xyz->size().height * 12)) / (max_cs_len * 8);
-
- /* Setup the encoder parameters using the current image and user parameters */
- opj_setup_encoder (encoder, ¶meters, xyz->opj_image());
-
- opj_stream_t* stream = opj_stream_default_create (OPJ_FALSE);
- if (!stream) {
- throw MiscError ("could not create JPEG2000 stream");
- }
-
- opj_stream_set_write_function (stream, write_function);
- WriteBuffer* buffer = new WriteBuffer ();
- opj_stream_set_user_data (stream, buffer, write_free_function);
-
- if (!opj_start_compress (encoder, xyz->opj_image(), stream)) {
- throw MiscError ("could not start JPEG2000 encoding");
- }
-
- if (!opj_encode (encoder, stream)) {
- opj_destroy_codec (encoder);
- opj_stream_destroy (stream);
- throw MiscError ("JPEG2000 encoding failed");
- }
-
- if (!opj_end_compress (encoder, stream)) {
- throw MiscError ("could not end JPEG2000 encoding");
- }
-
- Data enc (buffer->data ());
-
- free (parameters.cp_comment);
- opj_destroy_codec (encoder);
- opj_stream_destroy (stream);
-
- return enc;
-}
-
/** @param s A string.
* @return true if the string contains only space, newline or tab characters, or is empty.
*/
projects / libdcp.git / blobdiff