* MLP codec common header file
* Copyright (c) 2007-2008 Ian Caulfield
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
- * FFmpeg is distributed in the hope that it will be useful,
+ * Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/** Last possible matrix channel for each codec */
#define MAX_MATRIX_CHANNEL_MLP 5
#define MAX_MATRIX_CHANNEL_TRUEHD 7
-/** Maximum number of channels that can be decoded. */
-#define MAX_CHANNELS 16
+/** Maximum number of channels in a valid stream.
+ * MLP : 5.1 + 2 noise channels -> 8 channels
+ * TrueHD: 7.1 -> 8 channels
+ */
+#define MAX_CHANNELS 8
/** Maximum number of matrices used in decoding; most streams have one matrix
* per output channel, but some rematrix a channel (usually 0) more than once.
*/
-#define MAX_MATRICES 15
+#define MAX_MATRICES_MLP 6
+#define MAX_MATRICES_TRUEHD 8
+#define MAX_MATRICES 8
/** Maximum number of substreams that can be decoded.
* MLP's limit is 2. TrueHD supports at least up to 3.
*/
#define MAX_SUBSTREAMS 3
+/** which multiple of 48000 the maximum sample rate is */
+#define MAX_RATEFACTOR 4
/** maximum sample frequency seen in files */
-#define MAX_SAMPLERATE 192000
+#define MAX_SAMPLERATE (MAX_RATEFACTOR * 48000)
/** maximum number of audio samples within one access unit */
-#define MAX_BLOCKSIZE (40 * (MAX_SAMPLERATE / 48000))
+#define MAX_BLOCKSIZE (40 * MAX_RATEFACTOR)
/** next power of two greater than MAX_BLOCKSIZE */
-#define MAX_BLOCKSIZE_POW2 (64 * (MAX_SAMPLERATE / 48000))
+#define MAX_BLOCKSIZE_POW2 (64 * MAX_RATEFACTOR)
/** number of allowed filters */
#define NUM_FILTERS 2
#define IIR 1
/** filter data */
-typedef struct {
+typedef struct FilterParams {
uint8_t order; ///< number of taps in filter
uint8_t shift; ///< Right shift to apply to output of filter.
- int32_t coeff[MAX_FIR_ORDER];
int32_t state[MAX_FIR_ORDER];
} FilterParams;
/** sample data coding information */
-typedef struct {
+typedef struct ChannelParams {
FilterParams filter_params[NUM_FILTERS];
+ int32_t coeff[NUM_FILTERS][MAX_FIR_ORDER];
int16_t huff_offset; ///< Offset to apply to residual values.
int32_t sign_huff_offset; ///< sign/rounding-corrected version of huff_offset