michael@0: /*********************************************************************** michael@0: Copyright (c) 2006-2011, Skype Limited. All rights reserved. michael@0: Redistribution and use in source and binary forms, with or without michael@0: modification, are permitted provided that the following conditions michael@0: are met: michael@0: - Redistributions of source code must retain the above copyright notice, michael@0: this list of conditions and the following disclaimer. michael@0: - Redistributions in binary form must reproduce the above copyright michael@0: notice, this list of conditions and the following disclaimer in the michael@0: documentation and/or other materials provided with the distribution. michael@0: - Neither the name of Internet Society, IETF or IETF Trust, nor the michael@0: names of specific contributors, may be used to endorse or promote michael@0: products derived from this software without specific prior written michael@0: permission. michael@0: THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" michael@0: AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE michael@0: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE michael@0: ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE michael@0: LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR michael@0: CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF michael@0: SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS michael@0: INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN michael@0: CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) michael@0: ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE michael@0: POSSIBILITY OF SUCH DAMAGE. michael@0: ***********************************************************************/ michael@0: michael@0: #ifdef HAVE_CONFIG_H michael@0: #include "config.h" michael@0: #endif michael@0: michael@0: #include "main.h" michael@0: #include "tuning_parameters.h" michael@0: michael@0: /* Control internal sampling rate */ michael@0: opus_int silk_control_audio_bandwidth( michael@0: silk_encoder_state *psEncC, /* I/O Pointer to Silk encoder state */ michael@0: silk_EncControlStruct *encControl /* I Control structure */ michael@0: ) michael@0: { michael@0: opus_int fs_kHz; michael@0: opus_int32 fs_Hz; michael@0: michael@0: fs_kHz = psEncC->fs_kHz; michael@0: fs_Hz = silk_SMULBB( fs_kHz, 1000 ); michael@0: if( fs_Hz == 0 ) { michael@0: /* Encoder has just been initialized */ michael@0: fs_Hz = silk_min( psEncC->desiredInternal_fs_Hz, psEncC->API_fs_Hz ); michael@0: fs_kHz = silk_DIV32_16( fs_Hz, 1000 ); michael@0: } else if( fs_Hz > psEncC->API_fs_Hz || fs_Hz > psEncC->maxInternal_fs_Hz || fs_Hz < psEncC->minInternal_fs_Hz ) { michael@0: /* Make sure internal rate is not higher than external rate or maximum allowed, or lower than minimum allowed */ michael@0: fs_Hz = psEncC->API_fs_Hz; michael@0: fs_Hz = silk_min( fs_Hz, psEncC->maxInternal_fs_Hz ); michael@0: fs_Hz = silk_max( fs_Hz, psEncC->minInternal_fs_Hz ); michael@0: fs_kHz = silk_DIV32_16( fs_Hz, 1000 ); michael@0: } else { michael@0: /* State machine for the internal sampling rate switching */ michael@0: if( psEncC->sLP.transition_frame_no >= TRANSITION_FRAMES ) { michael@0: /* Stop transition phase */ michael@0: psEncC->sLP.mode = 0; michael@0: } michael@0: if( psEncC->allow_bandwidth_switch || encControl->opusCanSwitch ) { michael@0: /* Check if we should switch down */ michael@0: if( silk_SMULBB( psEncC->fs_kHz, 1000 ) > psEncC->desiredInternal_fs_Hz ) michael@0: { michael@0: /* Switch down */ michael@0: if( psEncC->sLP.mode == 0 ) { michael@0: /* New transition */ michael@0: psEncC->sLP.transition_frame_no = TRANSITION_FRAMES; michael@0: michael@0: /* Reset transition filter state */ michael@0: silk_memset( psEncC->sLP.In_LP_State, 0, sizeof( psEncC->sLP.In_LP_State ) ); michael@0: } michael@0: if( encControl->opusCanSwitch ) { michael@0: /* Stop transition phase */ michael@0: psEncC->sLP.mode = 0; michael@0: michael@0: /* Switch to a lower sample frequency */ michael@0: fs_kHz = psEncC->fs_kHz == 16 ? 12 : 8; michael@0: } else { michael@0: if( psEncC->sLP.transition_frame_no <= 0 ) { michael@0: encControl->switchReady = 1; michael@0: /* Make room for redundancy */ michael@0: encControl->maxBits -= encControl->maxBits * 5 / ( encControl->payloadSize_ms + 5 ); michael@0: } else { michael@0: /* Direction: down (at double speed) */ michael@0: psEncC->sLP.mode = -2; michael@0: } michael@0: } michael@0: } michael@0: else michael@0: /* Check if we should switch up */ michael@0: if( silk_SMULBB( psEncC->fs_kHz, 1000 ) < psEncC->desiredInternal_fs_Hz ) michael@0: { michael@0: /* Switch up */ michael@0: if( encControl->opusCanSwitch ) { michael@0: /* Switch to a higher sample frequency */ michael@0: fs_kHz = psEncC->fs_kHz == 8 ? 12 : 16; michael@0: michael@0: /* New transition */ michael@0: psEncC->sLP.transition_frame_no = 0; michael@0: michael@0: /* Reset transition filter state */ michael@0: silk_memset( psEncC->sLP.In_LP_State, 0, sizeof( psEncC->sLP.In_LP_State ) ); michael@0: michael@0: /* Direction: up */ michael@0: psEncC->sLP.mode = 1; michael@0: } else { michael@0: if( psEncC->sLP.mode == 0 ) { michael@0: encControl->switchReady = 1; michael@0: /* Make room for redundancy */ michael@0: encControl->maxBits -= encControl->maxBits * 5 / ( encControl->payloadSize_ms + 5 ); michael@0: } else { michael@0: /* Direction: up */ michael@0: psEncC->sLP.mode = 1; michael@0: } michael@0: } michael@0: } else { michael@0: if (psEncC->sLP.mode<0) michael@0: psEncC->sLP.mode = 1; michael@0: } michael@0: } michael@0: } michael@0: michael@0: return fs_kHz; michael@0: }