cannam@154: /*********************************************************************** cannam@154: Copyright (c) 2006-2011, Skype Limited. All rights reserved. cannam@154: Redistribution and use in source and binary forms, with or without cannam@154: modification, are permitted provided that the following conditions cannam@154: are met: cannam@154: - Redistributions of source code must retain the above copyright notice, cannam@154: this list of conditions and the following disclaimer. cannam@154: - Redistributions in binary form must reproduce the above copyright cannam@154: notice, this list of conditions and the following disclaimer in the cannam@154: documentation and/or other materials provided with the distribution. cannam@154: - Neither the name of Internet Society, IETF or IETF Trust, nor the cannam@154: names of specific contributors, may be used to endorse or promote cannam@154: products derived from this software without specific prior written cannam@154: permission. cannam@154: THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" cannam@154: AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE cannam@154: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE cannam@154: ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE cannam@154: LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR cannam@154: CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF cannam@154: SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS cannam@154: INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN cannam@154: CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) cannam@154: ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE cannam@154: POSSIBILITY OF SUCH DAMAGE. cannam@154: ***********************************************************************/ cannam@154: cannam@154: #ifdef HAVE_CONFIG_H cannam@154: #include "config.h" cannam@154: #endif cannam@154: cannam@154: #include "main.h" cannam@154: #include "tuning_parameters.h" cannam@154: cannam@154: /* Control internal sampling rate */ cannam@154: opus_int silk_control_audio_bandwidth( cannam@154: silk_encoder_state *psEncC, /* I/O Pointer to Silk encoder state */ cannam@154: silk_EncControlStruct *encControl /* I Control structure */ cannam@154: ) cannam@154: { cannam@154: opus_int fs_kHz; cannam@154: opus_int orig_kHz; cannam@154: opus_int32 fs_Hz; cannam@154: cannam@154: orig_kHz = psEncC->fs_kHz; cannam@154: /* Handle a bandwidth-switching reset where we need to be aware what the last sampling rate was. */ cannam@154: if( orig_kHz == 0 ) { cannam@154: orig_kHz = psEncC->sLP.saved_fs_kHz; cannam@154: } cannam@154: fs_kHz = orig_kHz; cannam@154: fs_Hz = silk_SMULBB( fs_kHz, 1000 ); cannam@154: if( fs_Hz == 0 ) { cannam@154: /* Encoder has just been initialized */ cannam@154: fs_Hz = silk_min( psEncC->desiredInternal_fs_Hz, psEncC->API_fs_Hz ); cannam@154: fs_kHz = silk_DIV32_16( fs_Hz, 1000 ); cannam@154: } else if( fs_Hz > psEncC->API_fs_Hz || fs_Hz > psEncC->maxInternal_fs_Hz || fs_Hz < psEncC->minInternal_fs_Hz ) { cannam@154: /* Make sure internal rate is not higher than external rate or maximum allowed, or lower than minimum allowed */ cannam@154: fs_Hz = psEncC->API_fs_Hz; cannam@154: fs_Hz = silk_min( fs_Hz, psEncC->maxInternal_fs_Hz ); cannam@154: fs_Hz = silk_max( fs_Hz, psEncC->minInternal_fs_Hz ); cannam@154: fs_kHz = silk_DIV32_16( fs_Hz, 1000 ); cannam@154: } else { cannam@154: /* State machine for the internal sampling rate switching */ cannam@154: if( psEncC->sLP.transition_frame_no >= TRANSITION_FRAMES ) { cannam@154: /* Stop transition phase */ cannam@154: psEncC->sLP.mode = 0; cannam@154: } cannam@154: if( psEncC->allow_bandwidth_switch || encControl->opusCanSwitch ) { cannam@154: /* Check if we should switch down */ cannam@154: if( silk_SMULBB( orig_kHz, 1000 ) > psEncC->desiredInternal_fs_Hz ) cannam@154: { cannam@154: /* Switch down */ cannam@154: if( psEncC->sLP.mode == 0 ) { cannam@154: /* New transition */ cannam@154: psEncC->sLP.transition_frame_no = TRANSITION_FRAMES; cannam@154: cannam@154: /* Reset transition filter state */ cannam@154: silk_memset( psEncC->sLP.In_LP_State, 0, sizeof( psEncC->sLP.In_LP_State ) ); cannam@154: } cannam@154: if( encControl->opusCanSwitch ) { cannam@154: /* Stop transition phase */ cannam@154: psEncC->sLP.mode = 0; cannam@154: cannam@154: /* Switch to a lower sample frequency */ cannam@154: fs_kHz = orig_kHz == 16 ? 12 : 8; cannam@154: } else { cannam@154: if( psEncC->sLP.transition_frame_no <= 0 ) { cannam@154: encControl->switchReady = 1; cannam@154: /* Make room for redundancy */ cannam@154: encControl->maxBits -= encControl->maxBits * 5 / ( encControl->payloadSize_ms + 5 ); cannam@154: } else { cannam@154: /* Direction: down (at double speed) */ cannam@154: psEncC->sLP.mode = -2; cannam@154: } cannam@154: } cannam@154: } cannam@154: else cannam@154: /* Check if we should switch up */ cannam@154: if( silk_SMULBB( orig_kHz, 1000 ) < psEncC->desiredInternal_fs_Hz ) cannam@154: { cannam@154: /* Switch up */ cannam@154: if( encControl->opusCanSwitch ) { cannam@154: /* Switch to a higher sample frequency */ cannam@154: fs_kHz = orig_kHz == 8 ? 12 : 16; cannam@154: cannam@154: /* New transition */ cannam@154: psEncC->sLP.transition_frame_no = 0; cannam@154: cannam@154: /* Reset transition filter state */ cannam@154: silk_memset( psEncC->sLP.In_LP_State, 0, sizeof( psEncC->sLP.In_LP_State ) ); cannam@154: cannam@154: /* Direction: up */ cannam@154: psEncC->sLP.mode = 1; cannam@154: } else { cannam@154: if( psEncC->sLP.mode == 0 ) { cannam@154: encControl->switchReady = 1; cannam@154: /* Make room for redundancy */ cannam@154: encControl->maxBits -= encControl->maxBits * 5 / ( encControl->payloadSize_ms + 5 ); cannam@154: } else { cannam@154: /* Direction: up */ cannam@154: psEncC->sLP.mode = 1; cannam@154: } cannam@154: } cannam@154: } else { cannam@154: if (psEncC->sLP.mode<0) cannam@154: psEncC->sLP.mode = 1; cannam@154: } cannam@154: } cannam@154: } cannam@154: cannam@154: return fs_kHz; cannam@154: }