ESP-IDF
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#include <stdint.h>
wav_header_t
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SourceVuESP-IDF Framework and ExamplesESP-IDFexamples/peripherals/i2s/i2s_examples_common/format_wav.h
 
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/* * SPDX-FileCopyrightText: 2022 Espressif Systems (Shanghai) CO LTD * * SPDX-License-Identifier: Unlicense OR CC0-1.0 *//* ... */ #pragma once #include <stdint.h> #ifdef __cplusplus extern "C" { #endif /** * @brief Header structure for WAV file with only one data chunk * * @note See this for reference: http://soundfile.sapp.org/doc/WaveFormat/ * * @note Assignment to variables in this struct directly is only possible for little endian architectures * (including Xtensa & RISC-V) *//* ... */ typedef struct { struct { char chunk_id[4]; /*!< Contains the letters "RIFF" in ASCII form */ uint32_t chunk_size; /*!< This is the size of the rest of the chunk following this number */ char chunk_format[4]; /*!< Contains the letters "WAVE" */ }{ ... } descriptor_chunk; /*!< Canonical WAVE format starts with the RIFF header */ struct { char subchunk_id[4]; /*!< Contains the letters "fmt " */ uint32_t subchunk_size; /*!< This is the size of the rest of the Subchunk which follows this number */ uint16_t audio_format; /*!< PCM = 1, values other than 1 indicate some form of compression */ uint16_t num_of_channels; /*!< Mono = 1, Stereo = 2, etc. */ uint32_t sample_rate; /*!< 8000, 44100, etc. */ uint32_t byte_rate; /*!< ==SampleRate * NumChannels * BitsPerSample s/ 8 */ uint16_t block_align; /*!< ==NumChannels * BitsPerSample / 8 */ uint16_t bits_per_sample; /*!< 8 bits = 8, 16 bits = 16, etc. */ }{ ... } fmt_chunk; /*!< The "fmt " subchunk describes the sound data's format */ struct { char subchunk_id[4]; /*!< Contains the letters "data" */ uint32_t subchunk_size; /*!< ==NumSamples * NumChannels * BitsPerSample / 8 */ int16_t data[0]; /*!< Holds raw audio data */ }{ ... } data_chunk; /*!< The "data" subchunk contains the size of the data and the actual sound */ }{ ... } wav_header_t; /** * @brief Default header for PCM format WAV files * *//* ... */ #define WAV_HEADER_PCM_DEFAULT(wav_sample_size, wav_sample_bits, wav_sample_rate, wav_channel_num) { \ .descriptor_chunk = { \ .chunk_id = {'R', 'I', 'F', 'F'}, \ .chunk_size = (wav_sample_size) + sizeof(wav_header_t) - 8, \ .chunk_format = {'W', 'A', 'V', 'E'} \ }{...}, \ .fmt_chunk = { \ .subchunk_id = {'f', 'm', 't', ' '}, \ .subchunk_size = 16, /* 16 for PCM */ \ .audio_format = 1, /* 1 for PCM */ \ .num_of_channels = (wav_channel_num), \ .sample_rate = (wav_sample_rate), \ .byte_rate = (wav_sample_bits) * (wav_sample_rate) * (wav_channel_num) / 8, \ .block_align = (wav_sample_bits) * (wav_channel_num) / 8, \ .bits_per_sample = (wav_sample_bits)\ }{...}, \ .data_chunk = { \ .subchunk_id = {'d', 'a', 't', 'a'}, \ .subchunk_size = (wav_sample_size) \ }{...} \ }{...} #ifdef __cplusplus }{...} #endif
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