kaguya
53 lines
2.0 KiB
C
53 lines
2.0 KiB
C
#pragma once
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#include <stdint.h>
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#include <stdbool.h>
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#include "hda.h"
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/*
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* Minimal WAV (RIFF/WAVE) header types.
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* pcm_play_file() autodetects RIFF/WAVE and falls back to raw PCM if the
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* magic bytes aren't present.
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*/
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typedef struct __attribute__((packed)) {
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char chunk_id[4]; /* "RIFF" */
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uint32_t chunk_size; /* file size − 8 */
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char format[4]; /* "WAVE" */
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} wav_riff_t;
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typedef struct __attribute__((packed)) {
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char chunk_id[4]; /* "fmt " */
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uint32_t chunk_size; /* 16 for PCM */
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uint16_t audio_format; /* 1 = PCM (linear) */
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uint16_t channels;
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uint32_t sample_rate;
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uint32_t byte_rate; /* sample_rate * channels * bits_per_sample / 8 */
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uint16_t block_align;
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uint16_t bits_per_sample;
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} wav_fmt_chunk_t;
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/*
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* pcm_play_file - read a file from the ext2 root directory and play it via HDA.
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*
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* Supports:
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* • WAV – any PCM WAV (no compression): sample rate / channels / bit depth
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* are read from the "fmt " chunk automatically.
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* • Raw – no RIFF header; audio is assumed to be 48 000 Hz, 16-bit, stereo.
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* Override with pcm_play_raw() if file has a different format.
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*
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* The function allocates a physically-contiguous DMA buffer, reads the file,
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* starts playback, blocks until complete, then frees the buffer.
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*
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* @filename : name of the file in the ext2 root directory (e.g. "music.wav").
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* Returns : true on success.
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*/
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bool pcm_play_file(const char *filename);
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/*
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* pcm_play_raw - same as pcm_play_file but forces the given format instead of
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* auto-detecting from a WAV header. Useful for headerless .pcm files.
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*
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* @filename : file in ext2 root.
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* @fmt : sample rate / channels / bit depth.
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*/
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bool pcm_play_raw(const char *filename, hda_format_t fmt); |