{"id":1808,"date":"2020-09-15T22:49:07","date_gmt":"2020-09-15T20:49:07","guid":{"rendered":"https:\/\/www.pschatzmann.ch\/home\/?p=1808"},"modified":"2024-03-21T08:02:07","modified_gmt":"2024-03-21T07:02:07","slug":"sending-sound-from-an-esp32-to-a-bluetooth-sink-e-g-bluetooth-speaker","status":"publish","type":"post","link":"https:\/\/www.pschatzmann.ch\/home\/2020\/09\/15\/sending-sound-from-an-esp32-to-a-bluetooth-sink-e-g-bluetooth-speaker\/","title":{"rendered":"Sending Sound from an ESP32 to a Bluetooth Sink (e.g. Bluetooth Speaker)"},"content":{"rendered":"<p>A couple of months ago, I described how you can use my <a href=\"https:\/\/www.pschatzmann.ch\/home\/2020\/03\/27\/1255\/\">Arduino A2DP library<\/a> to receive music with an ESP32 via Bluetooth e.g. from a mobile phone.<\/p>\n<p>I have extended the library and implemented the <strong>BluetoothA2DPSource<\/strong> class that you can use to to the opposite and send sound data from an ESP32 to a Bluetooth Receiver:<\/p>\n<pre><code>#include \"BluetoothA2DPSource.h\"\n#include &lt;math.h&gt; \n\nBluetoothA2DPSource a2dp_source;\n\nvoid setup() {\n  a2dp_source.start(\"MyMusic\", get_sound_data);  \n}\n\nvoid loop() {\n}\n\n<\/code><\/pre>\n<p>That&#8217;s pretty easy to use: In the start you just indicate the Bluetooth Device name that you want to connect to and indicate a call back function. So the only challenge is to provide an implementation for the <strong>get_sound_data callback method<\/strong>. The supported audio codec in ESP32 A2DP is SBC: SBC audio stream is encoded from PCM data normally formatted as <strong>44.1kHz sampling rate<\/strong> with <strong>two-channel 16-bit<\/strong> sample data.<\/p>\n<p>Here is an simple implementation that just generates some sound with the help of the <strong>sin()<\/strong> function:<\/p>\n<pre><code>#define c3_frequency  130.81\n#define c4_frequency  261.63 \n\n\/\/ The supported audio codec in ESP32 A2DP is SBC. SBC audio stream is encoded\n\/\/ from PCM data normally formatted as 44.1kHz sampling rate, two-channel 16-bit sample data\nint32_t get_data(uint8_t *data, int32_t len) {\n    if (len &lt; 0 || data == NULL) {\n        return 0;\n    }\n    Channels* ch_data = (Channels*) data;\n    static double m_time = 0.0;\n    double m_amplitude = 10000;  \/\/ max -32,768 to 32,767\n    double m_deltaTime = 1.0 \/ 44100;\n    double m_phase = 0.0;\n    double double_Pi = PI * 2.0;\n    for (int sample = 0; sample &lt; len\/4; ++sample) {\n        ch_data[sample].channel1 = m_amplitude * sin(double_Pi * c3_frequency * m_time + m_phase);\n        ch_data[sample].channel2 = m_amplitude * sin(double_Pi * c4_frequency * m_time + m_phase);\n        m_time += m_deltaTime;\n    }\n    return len;\n}\n\n<\/code><\/pre>\n<p>The new <strong>version 1.1<\/strong> of the library is available new on <a href=\"https:\/\/github.com\/pschatzmann\/ESP32-A2DP\">Github<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A couple of months ago, I described how you can use my Arduino A2DP library to receive music with an ESP32 via Bluetooth e.g. from a mobile phone. I have extended the library and implemented the BluetoothA2DPSource class that you can use to to the opposite and send sound data [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1307,"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],"tags":[46],"class_list":["post-1808","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-arduino","tag-communications"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Sending Sound from an ESP32 to a Bluetooth Sink (e.g. Bluetooth Speaker) - 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\/2020\/09\/15\/sending-sound-from-an-esp32-to-a-bluetooth-sink-e-g-bluetooth-speaker\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Sending Sound from an ESP32 to a Bluetooth Sink (e.g. Bluetooth Speaker) - Phil Schatzmann\" \/>\n<meta property=\"og:description\" content=\"A couple of months ago, I described how you can use my Arduino A2DP library to receive music with an ESP32 via Bluetooth e.g. from a mobile phone. I have extended the library and implemented the BluetoothA2DPSource class that you can use to to the opposite and send sound data [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.pschatzmann.ch\/home\/2020\/09\/15\/sending-sound-from-an-esp32-to-a-bluetooth-sink-e-g-bluetooth-speaker\/\" \/>\n<meta property=\"og:site_name\" content=\"Phil Schatzmann\" \/>\n<meta property=\"article:published_time\" content=\"2020-09-15T20:49:07+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-03-21T07:02:07+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.pschatzmann.ch\/wp-content\/uploads\/2020\/03\/esp32.jpeg\" \/>\n\t<meta property=\"og:image:width\" content=\"266\" \/>\n\t<meta property=\"og:image:height\" content=\"190\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"pschatzmann\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"pschatzmann\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.pschatzmann.ch\\\/home\\\/2020\\\/09\\\/15\\\/sending-sound-from-an-esp32-to-a-bluetooth-sink-e-g-bluetooth-speaker\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.pschatzmann.ch\\\/home\\\/2020\\\/09\\\/15\\\/sending-sound-from-an-esp32-to-a-bluetooth-sink-e-g-bluetooth-speaker\\\/\"},\"author\":{\"name\":\"pschatzmann\",\"@id\":\"https:\\\/\\\/www.pschatzmann.ch\\\/home\\\/#\\\/schema\\\/person\\\/73a53638a4e34e8373405fd737dac9b1\"},\"headline\":\"Sending Sound from an ESP32 to a Bluetooth Sink (e.g. Bluetooth Speaker)\",\"datePublished\":\"2020-09-15T20:49:07+00:00\",\"dateModified\":\"2024-03-21T07:02:07+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.pschatzmann.ch\\\/home\\\/2020\\\/09\\\/15\\\/sending-sound-from-an-esp32-to-a-bluetooth-sink-e-g-bluetooth-speaker\\\/\"},\"wordCount\":174,\"commentCount\":36,\"publisher\":{\"@id\":\"https:\\\/\\\/www.pschatzmann.ch\\\/home\\\/#\\\/schema\\\/person\\\/73a53638a4e34e8373405fd737dac9b1\"},\"image\":{\"@id\":\"https:\\\/\\\/www.pschatzmann.ch\\\/home\\\/2020\\\/09\\\/15\\\/sending-sound-from-an-esp32-to-a-bluetooth-sink-e-g-bluetooth-speaker\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.pschatzmann.ch\\\/wp-content\\\/uploads\\\/2020\\\/03\\\/esp32.jpeg\",\"keywords\":[\"Communications\"],\"articleSection\":[\"Arduino\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.pschatzmann.ch\\\/home\\\/2020\\\/09\\\/15\\\/sending-sound-from-an-esp32-to-a-bluetooth-sink-e-g-bluetooth-speaker\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.pschatzmann.ch\\\/home\\\/2020\\\/09\\\/15\\\/sending-sound-from-an-esp32-to-a-bluetooth-sink-e-g-bluetooth-speaker\\\/\",\"url\":\"https:\\\/\\\/www.pschatzmann.ch\\\/home\\\/2020\\\/09\\\/15\\\/sending-sound-from-an-esp32-to-a-bluetooth-sink-e-g-bluetooth-speaker\\\/\",\"name\":\"Sending Sound from an ESP32 to a Bluetooth Sink (e.g. Bluetooth Speaker) - 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