{"id":3024,"date":"2021-04-29T16:05:34","date_gmt":"2021-04-29T14:05:34","guid":{"rendered":"https:\/\/www.pschatzmann.ch\/home\/?p=3024"},"modified":"2024-03-21T07:58:27","modified_gmt":"2024-03-21T06:58:27","slug":"bluetooth-a2dp-streaming-from-files-on-a-sd-card","status":"publish","type":"post","link":"https:\/\/www.pschatzmann.ch\/home\/2021\/04\/29\/bluetooth-a2dp-streaming-from-files-on-a-sd-card\/","title":{"rendered":"Bluetooth A2DP &#8211; Streaming of Files on a SD card"},"content":{"rendered":"<p>In my <a href=\"https:\/\/github.com\/pschatzmann\/ESP32-A2DP\">Arduino ESP32-A2DP library<\/a> I am providing some very simple examples that show how to transform the ESP32 into a A2DP source and transmit sound to a Bluetooth Sink (e.g. some Bluetooth Speakers).<\/p>\n<p>I had quite a few questions on how to do this with files, microphones and I2S as input. So I started a <a href=\"https:\/\/github.com\/pschatzmann\/arduino-audio-tools\">small &#8220;glue&#8221; project which provides some additional audio tools<\/a>. I plan to provide plenty of additional examples and some more advances scenarios.<\/p>\n<p>In my <a href=\"https:\/\/www.pschatzmann.ch\/home\/2021\/04\/29\/bluetooth-a2dp-streaming-from-an-digital-i2s-microphone\/\">last blog<\/a>, I showed how to read audio data from I2S using a <strong>digital microphone<\/strong>. In this blog I provide the RAW audio data directly from <strong>a file on a SD card<\/strong>! In some future posts, I will demonstrate how to process different file formats.<\/p>\n<h1>Streaming from Files on a SD card<\/h1>\n<h2>The Sketch<\/h2>\n<p>Here is the Arduino Sketch that you can use with an I2S audio source:<\/p>\n<pre><code>#include \"BluetoothA2DPSource.h\"\n#include &lt;SPI.h&gt;\n#include &lt;SD.h&gt;\n\nBluetoothA2DPSource a2dp_source;\nFile sound_file;\nconst char* file_name = \"\/audio.raw\";\nconst int sd_ss_pin = 5;\nconst int frame_size_bytes = sizeof(int16_t) * 2;\n\n\/\/ callback used by A2DP to provide the sound data\nint32_t get_sound_data(Channels* data, int32_t len) {\n  \/\/ the data in the file must be in int16 with 2 channels \n  size_t result_len_bytes = sound_file.read((uint8_t*)data, len * frame_size_bytes );\n  \/\/ result is in number of frames\n  int32_t result_len = result_len_bytes \/ frame_size_bytes;\n  ESP_LOGD(\"get_sound_data\", \"%d -&gt; %d\",len );\n  return result_len;\n}\n\n\/\/ Arduino Setup\nvoid setup(void) {\n  Serial.begin(115200);\n\n  \/\/ Setup SD and open file\n  SD.begin(sd_ss_pin);\n  sound_file = SD.open(file_name, FILE_READ);\n\n  \/\/ start the bluetooth\n  Serial.println(\"starting A2DP...\");\n  a2dp_source.start(\"MyMusic\", get_sound_data);  \n}\n\n\/\/ Arduino loop - repeated processing \nvoid loop() {\n}\n\n<\/code><\/pre>\n<p>The get_sound_data() callback is quite straight forward:  We are directly reading the raw audio file from the SD card. The audio file must be available using 16 bit integers with 2 channels. In the callback we just need to translate between number of frames and bytes!<\/p>\n<p><a href=\"https:\/\/www.audacityteam.org\/\">Audacity<\/a> might help you to create the right file format: export with the file name <strong>audio.raw<\/strong> as <strong>RAW<\/strong> <strong>signed 16 bit PCM<\/strong> and copy it to the SD card. In my example I was using the file <a href=\"https:\/\/pschatzmann.github.io\/Resources\/audio\/audio.raw\">audio.raw<\/a>.<\/p>\n<h2>The Device<\/h2>\n<p><img decoding=\"async\" src=\"https:\/\/pschatzmann.github.io\/Resources\/img\/sd-module.jpeg\" alt=\"sd\" \/><\/p>\n<p>The SD module is connected with the help of the SPI bus<\/p>\n<h2>Pins<\/h2>\n<table>\n<thead>\n<tr>\n<th>SD<\/th>\n<th>ESP32<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>VCC<\/td>\n<td>5V<\/td>\n<\/tr>\n<tr>\n<td>GND<\/td>\n<td>GND<\/td>\n<\/tr>\n<tr>\n<td>CS<\/td>\n<td>CS GP5<\/td>\n<\/tr>\n<tr>\n<td>SCK<\/td>\n<td>SCK GP18<\/td>\n<\/tr>\n<tr>\n<td>MOSI<\/td>\n<td>MOSI GP23<\/td>\n<\/tr>\n<tr>\n<td>MISO<\/td>\n<td>MISO GP19<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Source Code<\/h2>\n<p>Both the <a href=\"https:\/\/github.com\/pschatzmann\/arduino-audio-tools\">project<\/a> and the <a href=\"https:\/\/github.com\/pschatzmann\/arduino-audio-tools\/blob\/main\/examples\/examples-basic-api\/base-player-a2dp\/base-player-a2dp.ino\">example<\/a> can be found on Github.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In my Arduino ESP32-A2DP library I am providing some very simple examples that show how to transform the ESP32 into a A2DP source and transmit sound to a Bluetooth Sink (e.g. some Bluetooth Speakers). I had quite a few questions on how to do this with files, microphones and I2S [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3025,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_crdt_document":"","_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"footnotes":""},"categories":[20,22],"tags":[46],"class_list":["post-3024","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-arduino","category-machine-sound","tag-communications"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Bluetooth A2DP - Streaming of Files on a SD card - Phil Schatzmann<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.pschatzmann.ch\/home\/2021\/04\/29\/bluetooth-a2dp-streaming-from-files-on-a-sd-card\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Bluetooth A2DP - Streaming of Files on a SD card - Phil Schatzmann\" \/>\n<meta property=\"og:description\" content=\"In my Arduino ESP32-A2DP library I am providing some very simple examples that show how to transform the ESP32 into a A2DP source and transmit sound to a Bluetooth Sink (e.g. some Bluetooth Speakers). 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