Resample only works on PCM format.
To covert 16bits to 32bits PCM, if all use little endian, you need only left shift 16 bits, no need resample.
If you want to change 16bits mp3 to 32bits mp3, you need firstly decode mp3 into pcm, convert to 32 bits then re-encode to mp3.

The mentioned issue is a network issue. You can replace https://dl.espressif.com/dl/audio/ff-16b-2c-44100hz.mp3 to a valid address that you can access. Also you can try to ping espressif.com to check whether success or not g_stream$ ping espressif.com PING espressif.com (143.204.215.83) 56(84) bytes...

播放音量主要是 es8388_set_voice_volume(int volume)这个API控制的你可以把音量设置为90看声音大不大

You can see the define on: https://github.com/espressif/esp-adf/blob/master/components/audio_board/lyrat_mini_v1_1/board.c#L116 If you use customized board, you can create a folder like following and put your board defines into it https://github.com/espressif/esp-adf/tree/master/examples/get-started...

Have you change the code below:
int ret = i2s_read(CODEC_ADC_I2S_PORT, buf, len, &bytes_read, wait_time);
changed to
int ret = i2s_read(1, buf, len, &bytes_read, wait_time);

For that record and playback use same I2S.

Seems there is not enough memory.

E (15715) FIR_RESAMPLE: failed to allocate p_out buffer.size 196608 line 2010

Please try to enable PSRAM, after enabled adf module will try to use PSRAM firstly.
Menuconfig -> Component Config -> esp32 specific --> support for external, SPI-connected RAM

audio_pipeline_link is used to connect elements from first one to last one It allocates ring buffer for data exchange between audio element. audio_pipeline_unlink do the reverse work, it disconnects elements from each other, and free ringbuffer. audio_pipeline_breakup_elements just disconnect elemen...

opus目前和其他decoder往上提供相同的接口，因为不是每个decoder都支持设置volume，所以不会单独开出来特殊的API来设置音量 从代码上看opus设置gain也只是做了一次乘法 if(st->decode_gain) { opus_val32 gain; gain = celt_exp2(MULT16_16_P15(QCONST16(6.48814081e-4f, 25), st->decode_gain)); for (i=0;i<frame_size*st->channels;i++) { opus_val32 x; x = MULT16_32_P16(pcm ,gain)...

使用esp_audio相对来说比较简单
1: esp_audio_duration_get 可以用来获取duration
2: esp_audio_time_get可以用来获取当前播放时间
3: esp_audio_seek 可以用来seek到特定的位置

To make all code runs ok you need change following code also: change code in audio_element.c esp_err_t audio_element_set_ringbuf_done(audio_element_handle_t el) { int ret = ESP_OK; if (NULL == el) { return ESP_FAIL; } if (el->out.output_rb) { ret |= rb_done_write(el->out.output_rb); for (int i = 0; ...