1 /* 2 * Copyright (c) 2011 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #include "arith_routines.h" 12 #include "settings.h" 13 14 15 /* 16 * terminate and return byte stream; 17 * returns the number of bytes in the stream 18 */ WebRtcIsac_EncTerminate(Bitstr * streamdata)19int WebRtcIsac_EncTerminate(Bitstr *streamdata) /* in-/output struct containing bitstream */ 20 { 21 uint8_t *stream_ptr; 22 23 24 /* point to the right place in the stream buffer */ 25 stream_ptr = streamdata->stream + streamdata->stream_index; 26 27 /* find minimum length (determined by current interval width) */ 28 if ( streamdata->W_upper > 0x01FFFFFF ) 29 { 30 streamdata->streamval += 0x01000000; 31 /* add carry to buffer */ 32 if (streamdata->streamval < 0x01000000) 33 { 34 /* propagate carry */ 35 while ( !(++(*--stream_ptr)) ); 36 /* put pointer back to the old value */ 37 stream_ptr = streamdata->stream + streamdata->stream_index; 38 } 39 /* write remaining data to bitstream */ 40 *stream_ptr++ = (uint8_t) (streamdata->streamval >> 24); 41 } 42 else 43 { 44 streamdata->streamval += 0x00010000; 45 /* add carry to buffer */ 46 if (streamdata->streamval < 0x00010000) 47 { 48 /* propagate carry */ 49 while ( !(++(*--stream_ptr)) ); 50 /* put pointer back to the old value */ 51 stream_ptr = streamdata->stream + streamdata->stream_index; 52 } 53 /* write remaining data to bitstream */ 54 *stream_ptr++ = (uint8_t) (streamdata->streamval >> 24); 55 *stream_ptr++ = (uint8_t) ((streamdata->streamval >> 16) & 0x00FF); 56 } 57 58 /* calculate stream length */ 59 return (int)(stream_ptr - streamdata->stream); 60 } 61