summaryrefslogtreecommitdiffstats
path: root/media/libopus/silk/decode_frame.c
diff options
context:
space:
mode:
Diffstat (limited to 'media/libopus/silk/decode_frame.c')
-rw-r--r--media/libopus/silk/decode_frame.c129
1 files changed, 129 insertions, 0 deletions
diff --git a/media/libopus/silk/decode_frame.c b/media/libopus/silk/decode_frame.c
new file mode 100644
index 000000000..a605d95ac
--- /dev/null
+++ b/media/libopus/silk/decode_frame.c
@@ -0,0 +1,129 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "main.h"
+#include "stack_alloc.h"
+#include "PLC.h"
+
+/****************/
+/* Decode frame */
+/****************/
+opus_int silk_decode_frame(
+ silk_decoder_state *psDec, /* I/O Pointer to Silk decoder state */
+ ec_dec *psRangeDec, /* I/O Compressor data structure */
+ opus_int16 pOut[], /* O Pointer to output speech frame */
+ opus_int32 *pN, /* O Pointer to size of output frame */
+ opus_int lostFlag, /* I 0: no loss, 1 loss, 2 decode fec */
+ opus_int condCoding, /* I The type of conditional coding to use */
+ int arch /* I Run-time architecture */
+)
+{
+ VARDECL( silk_decoder_control, psDecCtrl );
+ opus_int L, mv_len, ret = 0;
+ SAVE_STACK;
+
+ L = psDec->frame_length;
+ ALLOC( psDecCtrl, 1, silk_decoder_control );
+ psDecCtrl->LTP_scale_Q14 = 0;
+
+ /* Safety checks */
+ silk_assert( L > 0 && L <= MAX_FRAME_LENGTH );
+
+ if( lostFlag == FLAG_DECODE_NORMAL ||
+ ( lostFlag == FLAG_DECODE_LBRR && psDec->LBRR_flags[ psDec->nFramesDecoded ] == 1 ) )
+ {
+ VARDECL( opus_int16, pulses );
+ ALLOC( pulses, (L + SHELL_CODEC_FRAME_LENGTH - 1) &
+ ~(SHELL_CODEC_FRAME_LENGTH - 1), opus_int16 );
+ /*********************************************/
+ /* Decode quantization indices of side info */
+ /*********************************************/
+ silk_decode_indices( psDec, psRangeDec, psDec->nFramesDecoded, lostFlag, condCoding );
+
+ /*********************************************/
+ /* Decode quantization indices of excitation */
+ /*********************************************/
+ silk_decode_pulses( psRangeDec, pulses, psDec->indices.signalType,
+ psDec->indices.quantOffsetType, psDec->frame_length );
+
+ /********************************************/
+ /* Decode parameters and pulse signal */
+ /********************************************/
+ silk_decode_parameters( psDec, psDecCtrl, condCoding );
+
+ /********************************************************/
+ /* Run inverse NSQ */
+ /********************************************************/
+ silk_decode_core( psDec, psDecCtrl, pOut, pulses, arch );
+
+ /********************************************************/
+ /* Update PLC state */
+ /********************************************************/
+ silk_PLC( psDec, psDecCtrl, pOut, 0, arch );
+
+ psDec->lossCnt = 0;
+ psDec->prevSignalType = psDec->indices.signalType;
+ silk_assert( psDec->prevSignalType >= 0 && psDec->prevSignalType <= 2 );
+
+ /* A frame has been decoded without errors */
+ psDec->first_frame_after_reset = 0;
+ } else {
+ /* Handle packet loss by extrapolation */
+ silk_PLC( psDec, psDecCtrl, pOut, 1, arch );
+ }
+
+ /*************************/
+ /* Update output buffer. */
+ /*************************/
+ silk_assert( psDec->ltp_mem_length >= psDec->frame_length );
+ mv_len = psDec->ltp_mem_length - psDec->frame_length;
+ silk_memmove( psDec->outBuf, &psDec->outBuf[ psDec->frame_length ], mv_len * sizeof(opus_int16) );
+ silk_memcpy( &psDec->outBuf[ mv_len ], pOut, psDec->frame_length * sizeof( opus_int16 ) );
+
+ /************************************************/
+ /* Comfort noise generation / estimation */
+ /************************************************/
+ silk_CNG( psDec, psDecCtrl, pOut, L );
+
+ /****************************************************************/
+ /* Ensure smooth connection of extrapolated and good frames */
+ /****************************************************************/
+ silk_PLC_glue_frames( psDec, pOut, L );
+
+ /* Update some decoder state variables */
+ psDec->lagPrev = psDecCtrl->pitchL[ psDec->nb_subfr - 1 ];
+
+ /* Set output frame length */
+ *pN = L;
+
+ RESTORE_STACK;
+ return ret;
+}