tinycap Captured 0 frames on i.mx8mq android 13

peterwu2 — Thu, 30 Nov 2023 06:34:07 GMT

we use a hdmi-csi convertor LT6911.
LT6911 play I2S master. we connect to SAI3 of i.mx8mq.

hdmi plug to pc and playing youtube.

we can measure I2S signal. ( RXD0 , RXC, RXFS ) .

LT6911 have external osc, so the MCLK is not connect.

RXC = 48kHz (RXFS) x 32 x2 = 3.072MHz

RXD0RXCRXFS

the dts config.

lt6911c_1_codec: lt6911c_1-codec { compatible = "dummy-codec"; #sound-dai-cells = <0>; }; sound-lt6911c_1 { compatible = "simple-audio-card"; simple-audio-card,name = "lt6911c_1-audio"; simple-audio-card,format = "i2s"; simple-audio-card,frame-master = <&lt6911c_1_codec_dai>; simple-audio-card,bitclock-master = <&lt6911c_1_codec_dai>; lt6911c_1_codec_dai: simple-audio-card,cpu { sound-dai = <&sai3>; dai-tdm-slot-num = <2>; dai-tdm-slot-width = <32>; }; simple-audio-card,codec { sound-dai = <&lt6911c_1_codec 0>; }; }; &sai3 { #sound-dai-cells = <0>; pinctrl-names = "default"; pinctrl-0 = <&pinctrl_sai3>; assigned-clocks = <&clk IMX8MQ_CLK_SAI3>; assigned-clock-parents = <&clk IMX8MQ_AUDIO_PLL1_OUT>; assigned-clock-rates = <24576000>; clock-names = "bus", "mclk0", "mclk1", "mclk2", "mclk3", "pll8k", "pll11k"; clocks = <&clk IMX8MQ_CLK_SAI3_IPG>, <&clk IMX8MQ_CLK_DUMMY>, <&clk IMX8MQ_CLK_SAI3_ROOT>, <&clk IMX8MQ_CLK_DUMMY>, <&clk IMX8MQ_CLK_DUMMY>, <&clk IMX8MQ_AUDIO_PLL1_OUT>, <&clk IMX8MQ_AUDIO_PLL2_OUT>; fsl,sai-asynchronous; status = "okay"; }; pinctrl_sai3: sai3grp { fsl,pins = < MX8MQ_IOMUXC_SAI3_RXC_SAI3_RX_BCLK 0xd6 MX8MQ_IOMUXC_SAI3_RXFS_SAI3_RX_SYNC 0xd6 MX8MQ_IOMUXC_SAI3_RXD_SAI3_RX_DATA0 0xd6 >; };

sound cards ( there is pcmC0D0c )

chimera:/data # ls /dev/snd -al total 0 drwxr-xr-x 2 root root 220 1970-01-01 00:00 . drwxr-xr-x 24 root root 1960 1970-01-01 00:00 .. crw-rw---- 1 system audio 116, 3 1970-01-01 00:00 controlC0 crw-rw---- 1 system audio 116, 6 1970-01-01 00:00 controlC1 crw-rw---- 1 system audio 116, 9 1970-01-01 00:00 controlC2 crw-rw---- 1 system audio 116, 2 1970-01-01 00:00 pcmC0D0c crw-rw---- 1 system audio 116, 5 1970-01-01 00:00 pcmC1D0c crw-rw---- 1 system audio 116, 4 1970-01-01 00:00 pcmC1D0p crw-rw---- 1 system audio 116, 8 1970-01-01 00:00 pcmC2D0c crw-rw---- 1 system audio 116, 7 1970-01-01 00:00 pcmC2D0p crw-rw---- 1 system audio 116, 33 1970-01-01 00:00 timer chimera:/data # cat /proc/asound/cards 0 [lt6911c1audio ]: simple-card - lt6911c_1-audio lt6911c_1-audio 1 [btscoaudio ]: simple-card - bt-sco-audio bt-sco-audio 2 [wm8904audio ]: wm8904-audio - wm8904-audio wm8904-audio

we try to capture wav on android 13, it Captured 0 frames. the wav file is empty

# tinycap test.wav -D 0 Capturing sample: 2 ch, 44100 hz, 16 bit Captured 0 frames

the same configuration on android 11. capture wav is success.

why it fail on android 13, Any suggestion ?

Re: tinycap Captured 0 frames on i.mx8mq android 13

peterwu2 — Fri, 01 Dec 2023 02:43:55 GMT

It work. my typing error in dts

Re: tinycap Captured 0 frames on i.mx8mq android 13

peterwu2 — Fri, 01 Dec 2023 02:45:23 GMT

i.MX ProcessorsのトピックRe: tinycap Captured 0 frames on i.mx8mq android 13

tinycap Captured 0 frames on i.mx8mq android 13

Re: tinycap Captured 0 frames on i.mx8mq android 13

Re: tinycap Captured 0 frames on i.mx8mq android 13