SSRC app note needed

[alexjaw]

In this xmos forum thread , there is binary and source code from infiniteimprobability that provides an SSRC example. Would be great if it could be run with the latest sw_usb_audio. Have successfully run the binary provided by infiniteimprobability. Now I am trying to compile the source code with sw_usb_audio - usb_audio6.15.2. This is what I have done so far (replacing/adding code to sw_usb_audio from the source code provided from infiniteimprobability):

• Replaced main.xc in sc_usb_audio - 6.15.2
• Replaced usb_buffer.c and .h in usb_buffer of sc_usb_audio - 6.15.2
• Replaced Makefile in sw_usb_audio - usb_audio6.15.2 and added USED_MODULES += lib_src
• Replaced customdefines.h
• Added dsp_wrapper.c, .h, src_manager.c, .h to src/extensions. Replaced #include "SSRC.h" with #include "ssrc.h" in dsp_wrapper.c.

I did not expect to be able to compile the code without errors, but the errors that I get are confusing me - asrc_ctrl_t from lib_src is recognized but not ssrc_ctrl_t:

xmake CONFIG=i0o2xxxxxx all 
Checking build modules
WARNING: Required version of lib_xassert is >=2.0.0 and actual version has greater major version: 3.0.0. There could be API incompatibilities.
Using build modules: module_usb_shared module_xud module_usb_audio module_spdif_tx module_spdif_rx module_usb_midi module_dfu module_usb_device module_i2c_shared module_i2c_single_port module_adat_tx module_adat_rx lib_src(1.0.0) module_queue module_locks lib_logging(2.1.0) lib_xassert(3.0.0)
Analyzing dsp_wrapper.c
In file included from ../src/extensions/dsp_wrapper.c:9:
In file included from /home/alexander/workspace-xmos/lib_src/src/ssrc.h:25:
/home/alexander/workspace-xmos/lib_src/api/src.h:59:63: error: unknown type name 'ssrc_ctrl_t'; did you mean 'asrc_ctrl_t'?
void ssrc_init(const fs_code_t sr_in, const fs_code_t sr_out, ssrc_ctrl_t ssrc_ctrl[],
                                                              ^~~~~~~~~~~
                                                              asrc_ctrl_t
/home/alexander/workspace-xmos/lib_src/src/asrc.h:184:11: note: 'asrc_ctrl_t' declared here
        } asrc_ctrl_t;
          ^
In file included from ../src/extensions/dsp_wrapper.c:9:
In file included from /home/alexander/workspace-xmos/lib_src/src/ssrc.h:25:
/home/alexander/workspace-xmos/lib_src/api/src.h:69:54: error: unknown type name 'ssrc_ctrl_t'; did you mean 'asrc_ctrl_t'?
unsigned ssrc_process(int in_buff[], int out_buff[], ssrc_ctrl_t ssrc_ctrl[]);
                                                     ^~~~~~~~~~~
                                                     asrc_ctrl_t
/home/alexander/workspace-xmos/lib_src/src/asrc.h:184:11: note: 'asrc_ctrl_t' declared here
        } asrc_ctrl_t;
          ^
../src/extensions/dsp_wrapper.c:20:8: error: unknown type name 'SSRCState_t'
static SSRCState_t     sSSRCState[SSRC_N_CHANNELS];
       ^
../src/extensions/dsp_wrapper.c:21:52: error: use of undeclared identifier 'SSRC_N_IN_SAMPLES'
static int             iSSRCStack[SSRC_N_CHANNELS][SSRC_STACK_LENGTH_MULT * NUM_SSRC_SAMPS_IN];
                                                   ^
/home/alexander/workspace-xmos/lib_src/src/ssrc.h:35:77: note: expanded from macro 'SSRC_STACK_LENGTH_MULT'
    #define        SSRC_STACK_LENGTH_MULT                (SSRC_N_CHANNELS * SSRC_N_IN_SAMPLES)    // Multiplier for stack length (stack length = this value x the number of input samples to process)
                                                                            ^
../src/extensions/dsp_wrapper.c:22:8: error: unknown type name 'SSRCCtrl_t'; did you mean 'FIRCtrl_t'?
static SSRCCtrl_t      sSSRCCtrl[SSRC_N_CHANNELS];
       ^~~~~~~~~~
       FIRCtrl_t
/home/alexander/workspace-xmos/lib_src/src/FIR.h:211:11: note: 'FIRCtrl_t' declared here
        } FIRCtrl_t;
          ^
../src/extensions/dsp_wrapper.c:33:25: error: no member named 'psState' in 'struct _FIRCtrl'
    sSSRCCtrl[instance].psState                   = &sSSRCState[instance];
    ~~~~~~~~~~~~~~~~~~~ ^
../src/extensions/dsp_wrapper.c:34:25: error: no member named 'piStack' in 'struct _FIRCtrl'
    sSSRCCtrl[instance].piStack                   = iSSRCStack[instance];
    ~~~~~~~~~~~~~~~~~~~ ^
../src/extensions/dsp_wrapper.c:40:25: error: no member named 'uiDitherOnOff' in 'struct _FIRCtrl'
    sSSRCCtrl[instance].uiDitherOnOff             = SSRC_DITHER_OFF;
    ~~~~~~~~~~~~~~~~~~~ ^
../src/extensions/dsp_wrapper.c:41:25: error: no member named 'uiRndSeedInit' in 'struct _FIRCtrl'
    sSSRCCtrl[instance].uiRndSeedInit             = 1234567;
    ~~~~~~~~~~~~~~~~~~~ ^
../src/extensions/dsp_wrapper.c:44:25: error: no member named 'eInFs' in 'struct _FIRCtrl'
    sSSRCCtrl[instance].eInFs                     = sr_in;
    ~~~~~~~~~~~~~~~~~~~ ^
../src/extensions/dsp_wrapper.c:45:25: error: no member named 'eOutFs' in 'struct _FIRCtrl'
    sSSRCCtrl[instance].eOutFs                    = sr_out;
    ~~~~~~~~~~~~~~~~~~~ ^
../src/extensions/dsp_wrapper.c:48:18: warning: incompatible pointer types passing 'FIRCtrl_t *' (aka 'struct _FIRCtrl *') to parameter of type 'ssrc_ctrl_t *' (aka 'struct _SSRCCtrl *') [-Wincompatible-pointer-types]
    if(SSRC_init(&sSSRCCtrl[instance]) != SSRC_NO_ERROR) bomb_out();
                 ^~~~~~~~~~~~~~~~~~~~
/home/alexander/workspace-xmos/lib_src/src/ssrc.h:178:65: note: passing argument to parameter 'pssrc_ctrl' here
        SSRCReturnCodes_t                SSRC_init(ssrc_ctrl_t* pssrc_ctrl);    
                                                                ^
../src/extensions/dsp_wrapper.c:63:18: warning: incompatible pointer types passing 'FIRCtrl_t *' (aka 'struct _FIRCtrl *') to parameter of type 'ssrc_ctrl_t *' (aka 'struct _SSRCCtrl *') [-Wincompatible-pointer-types]
    if(SSRC_proc(&sSSRCCtrl[instance]) != SSRC_NO_ERROR) bomb_out();
                 ^~~~~~~~~~~~~~~~~~~~
/home/alexander/workspace-xmos/lib_src/src/ssrc.h:196:65: note: passing argument to parameter 'pssrc_ctrl' here
        SSRCReturnCodes_t                SSRC_proc(ssrc_ctrl_t* pssrc_ctrl);                            
                                                                ^
../src/extensions/dsp_wrapper.c:64:50: error: no member named 'puiNOutSamples' in 'struct _FIRCtrl'; did you mean 'uiNOutSamples'?
    unsigned n_samps_out = (*sSSRCCtrl[instance].puiNOutSamples);   //Get number of samples returned
                                                 ^~~~~~~~~~~~~~
                                                 uiNOutSamples
/home/alexander/workspace-xmos/lib_src/src/FIR.h:196:53: note: 'uiNOutSamples' declared here
            unsigned int                            uiNOutSamples;    // Number of output samples produced
                                                    ^
../src/extensions/dsp_wrapper.c:64:29: error: indirection requires pointer operand ('unsigned int' invalid)
    unsigned n_samps_out = (*sSSRCCtrl[instance].puiNOutSamples);   //Get number of samples returned
                            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2 warnings and 13 errors generated.
xmake[1]: *** [.build_i0o2xxxxxx/src/extensions/dsp_wrapper.c.pca.xml.decouple] Error 1
xmake: *** [analyze] Error 2```

[ed-xmos]

Hi @alexjaw, this github issue relates to an enhancement and details related to that, rather than a support channel. Can I ask that we move this support conversation back onto the forum? Of course anything that comes out of that can be added to this issue tracker. Ed, aka inifiniteimprobablility

[alexjaw]

No problem. I have made further progress and will update the forum thread when I have merged your demo with the latest usb app.