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| /* | ||
| xdrv_42_i2s.cpp - I2S audio support for Tasmota | ||
| Copyright (C) 2024 gemu2015 | ||
| This program is free software: you can redistribute it and/or modify | ||
| it under the terms of the GNU General Public License as published by | ||
| the Free Software Foundation, either version 3 of the License, or | ||
| (at your option) any later version. | ||
| This program is distributed in the hope that it will be useful, | ||
| but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| GNU General Public License for more details. | ||
| You should have received a copy of the GNU General Public License | ||
| along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
| */ | ||
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| #include "tasmota_options.h" | ||
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| #ifdef USE_I2S_MOD | ||
| #define XDRV_42 42 | ||
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| #include "module.h" | ||
| #include "module_defines.h" | ||
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| #define I2S_REV 1 << 16 | 4 | ||
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| PUSH_OPTIONS | ||
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| MODULE_DESCRIPTOR("I2SAUDIO", MODULE_TYPE_DRIVER, I2S_REV, "", 0, "", 0, "", 0, "", 0) | ||
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| // all functions must be declared MUDULE_PART | ||
| MODULE_PART int32_t I2SAudio_Init(); | ||
| MODULE_PART void I2S_PlayWave(void); | ||
| MODULE_PART void I2SAudio_Deinit(); | ||
| MODULE_PART int32_t mod_func_execute(uint32_t sel); | ||
| MODULE_END | ||
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| typedef struct { | ||
| uint16_t dummy; | ||
| } MODULE_MEMORY; | ||
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| int32_t I2SAudio_Init() { | ||
| ALLOCMEM | ||
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| initialized = true; | ||
| return 0; | ||
| } | ||
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| // RIFF header | ||
| typedef struct { | ||
| uint32_t ChunkID; //"RIFF" | ||
| uint32_t ChunkSize; //"36 + sizeof(wav_data_t) + data" | ||
| uint32_t Format; // "WAV" | ||
| } wav_riff_t; | ||
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| // FMT header | ||
| typedef struct { | ||
| uint32_t Subchunk1ID; //"fmt " | ||
| uint32_t Subchunk1Size; //16 (PCM) | ||
| uint16_t AudioFormat; // 1 'cause PCM | ||
| uint16_t NumChannels; // mono = 1; stereo = 2 | ||
| uint32_t SampleRate; // 8000, 44100, etc. | ||
| uint32_t ByteRate; //== SampleRate * NumChannels * byte | ||
| uint16_t BlockAlign; //== NumChannels * bytePerSample | ||
| uint16_t BytesPerSample; //8 byte = 8, 16 byte = 16, etc. | ||
| } wav_fmt_t; | ||
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| // Data header | ||
| typedef struct { | ||
| uint32_t Subchunk2ID; //"data" | ||
| uint32_t Subchunk2Size; //== NumSamples * NumChannels * bytePerSample/8 | ||
| } wav_data_t; | ||
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| // complete header | ||
| typedef struct { | ||
| wav_riff_t Riff; | ||
| wav_fmt_t Fmt; | ||
| wav_data_t Data; | ||
| } wav_header_t; | ||
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| const char S_JSON_FNF[] PROGMEM = "{\"File %s not found\"}"; | ||
| const char S_JSON_ILLF[] PROGMEM = "{\"Illegal File format\"}"; | ||
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| void I2S_PlayWave(void) { | ||
| SETREGS | ||
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| char *cp = XdrvMailbox->data; | ||
| while (*cp == ' ') cp++; | ||
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| File_p *wf; | ||
| wf = fopen(cp, 'r'); | ||
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| if (!wf) { | ||
| // file not found | ||
| Response_P(GSTR(S_JSON_FNF), cp); | ||
| return; | ||
| } | ||
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| int16_t buffer[512]; | ||
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| uint32_t fsize = fsize(wf); | ||
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| // check for RIFF | ||
| fread((char*)buffer, 1, sizeof(wav_header_t), wf); | ||
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| wav_header_t *wh = (wav_header_t *)buffer; | ||
| // 0x52494646 | ||
| if (wh->Riff.ChunkID != 0x46464952 && wh->Fmt.NumChannels != 1) { | ||
| fclose(wf); | ||
| Response_P(GSTR(S_JSON_ILLF)); | ||
| return; | ||
| } | ||
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| // read rest of header we assume 1 channel 8 khz | ||
| fsize -= sizeof(wav_header_t); | ||
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| i2s_begin(); | ||
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| i2s_set_rate(wh->Fmt.SampleRate); | ||
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| //while (fpos(wf) < fsize) { | ||
| while (1) { | ||
| uint32_t bytesread = fread((char*)buffer, 1, sizeof(buffer), wf); | ||
| if (!bytesread) { | ||
| break; | ||
| } | ||
| for (uint32_t i = 0; i < bytesread / 2; i++) { | ||
| i2s_write_sample(buffer[i]); | ||
| OsWatchLoop(); | ||
| } | ||
| } | ||
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| i2s_end(); | ||
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| fclose(wf); | ||
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| ResponseCmndDone(); | ||
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| return; | ||
| } | ||
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| const char I2S_Commands[] PROGMEM = | ||
| "I2S|" // Prefix | ||
| "pw"; | ||
| void (*const I2S_Command[])(void) PROGMEM = {&I2S_PlayWave}; | ||
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| void I2SAudio_Deinit() { | ||
| SETREGS | ||
| RETMEM | ||
| } | ||
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| /*********************************************************************************************\ | ||
| * Interface | ||
| \*********************************************************************************************/ | ||
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| static int32_t mod_func_execute(uint32_t sel) { | ||
| SETREGS | ||
| bool result = false; | ||
| switch (sel) { | ||
| case FUNC_INIT: | ||
| result = I2SAudio_Init(); | ||
| break; | ||
| case FUNC_COMMAND: | ||
| result = DecodeCommand(I2S_Commands, I2S_Command); | ||
| break; | ||
| case FUNC_DEINIT: | ||
| I2SAudio_Deinit(); | ||
| break; | ||
| } | ||
| return result; | ||
| } | ||
| PULL_OPTIONS | ||
| #endif // USE_I2S_MOD |
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