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atmel-samd: Fix AudioOut buffer playback by supporting bytes_per_sample.

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Thanks to @ntoll for finding this bug!
This commit is contained in:
Scott Shawcroft 2017-06-20 11:18:46 -07:00 committed by Scott Shawcroft
parent 5e231bd8f9
commit f878bc4efc
3 changed files with 21 additions and 12 deletions
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9
atmel-samd/common-hal/audioio/AudioOut.c
View File

@ -104,6 +104,7 @@ void audioout_reset(void) {
void audioout_background(void) {
if (MP_STATE_VM(audioout_block_counter) != NULL &&
active_audioout != NULL &&
active_audioout->second_buffer != NULL &&
active_audioout->last_loaded_block < tc_get_count_value(MP_STATE_VM(audioout_block_counter))) {
uint8_t* buffer;
if (tc_get_count_value(MP_STATE_VM(audioout_block_counter)) % 2 == 1) {
@ -133,6 +134,7 @@ void audioout_background(void) {
descriptor = active_audioout->second_descriptor;
}
descriptor->BTCNT.reg = length_read / active_audioout->bytes_per_sample;
descriptor->SRCADDR.reg = ((uint32_t) buffer) + length_read;
descriptor->DESCADDR.reg = 0;
}
}
@ -349,7 +351,8 @@ static void shared_construct(audioio_audioout_obj_t* self, const mcu_pin_obj_t*
void common_hal_audioio_audioout_construct_from_buffer(audioio_audioout_obj_t* self,
const mcu_pin_obj_t* pin,
uint16_t* buffer,
uint32_t len) {
uint32_t len,
uint8_t bytes_per_sample) {
self->pin = pin;
if (pin != &pin_PA02) {
mp_raise_ValueError("Invalid pin");
@ -361,8 +364,8 @@ void common_hal_audioio_audioout_construct_from_buffer(audioio_audioout_obj_t* s
self->buffer = (uint8_t*) buffer;
self->second_buffer = NULL;
// Input len is a count. Internal len is in bytes.
self->len = 2 * len;
self->bytes_per_sample = bytes_per_sample;
self->len = len;
self->frequency = 8000;
}

18
shared-bindings/audioio/AudioOut.c
View File

@ -27,6 +27,7 @@
#include <stdint.h>
#include "lib/utils/context_manager_helpers.h"
#include "py/binary.h"
#include "py/objproperty.h"
#include "py/runtime.h"
#include "shared-bindings/microcontroller/Pin.h"
@ -62,11 +63,11 @@
//|
//| # Generate one period of sine wav.
//| length = 8000 // 440
//| b = array.array("H", [0] * length)
//| sine_wave = array.array("H", [0] * length)
//| for i in range(length):
//| b[i] = int(math.sin(math.pi * 2 * i / 18) * (2 ** 15) + 2 ** 15)
//| sine_wave[i] = int(math.sin(math.pi * 2 * i / 18) * (2 ** 15) + 2 ** 15)
//|
//| sample = audioio.AudioOut(board.SPEAKER, sin_wave)
//| sample = audioio.AudioOut(board.SPEAKER, sine_wave)
//| sample.play(loop=True)
//| time.sleep(1)
//| sample.stop()
@ -106,12 +107,15 @@ STATIC mp_obj_t audioio_audioout_make_new(const mp_obj_type_t *type, size_t n_ar
if (MP_OBJ_IS_TYPE(args[1], &fatfs_type_fileio)) {
common_hal_audioio_audioout_construct_from_file(self, pin, MP_OBJ_TO_PTR(args[1]));
} else if (mp_get_buffer(args[1], &bufinfo, MP_BUFFER_READ)) {
if (bufinfo.len % 2 == 1) {
mp_raise_ValueError("sample_source must be an even number of bytes (two per sample)");
uint8_t bytes_per_sample = 1;
if (bufinfo.typecode == 'H') {
bytes_per_sample = 2;
} else if (bufinfo.typecode != 'B' && bufinfo.typecode != BYTEARRAY_TYPECODE) {
mp_raise_ValueError("sample_source buffer must be a bytearray or array of type 'H' or 'B'");
}
common_hal_audioio_audioout_construct_from_buffer(self, pin, ((uint16_t*)bufinfo.buf), bufinfo.len / 2);
common_hal_audioio_audioout_construct_from_buffer(self, pin, ((uint16_t*)bufinfo.buf), bufinfo.len, bytes_per_sample);
} else {
mp_raise_TypeError("sample_source must be a file or bytes-like object.");
mp_raise_TypeError("sample_source must be a file or bytes-like object");
}
return MP_OBJ_FROM_PTR(self);

6
shared-bindings/audioio/AudioOut.h
View File

@ -33,8 +33,10 @@
extern const mp_obj_type_t audioio_audioout_type;
void common_hal_audioio_audioout_construct_from_buffer(audioio_audioout_obj_t* self, const mcu_pin_obj_t* pin, uint16_t* buffer, uint32_t len);
void common_hal_audioio_audioout_construct_from_file(audioio_audioout_obj_t* self, const mcu_pin_obj_t* pin, pyb_file_obj_t* file);
void common_hal_audioio_audioout_construct_from_buffer(audioio_audioout_obj_t* self,
const mcu_pin_obj_t* pin, uint16_t* buffer, uint32_t len, uint8_t bytes_per_sample);
void common_hal_audioio_audioout_construct_from_file(audioio_audioout_obj_t* self,
const mcu_pin_obj_t* pin, pyb_file_obj_t* file);
void common_hal_audioio_audioout_deinit(audioio_audioout_obj_t* self);
void common_hal_audioio_audioout_play(audioio_audioout_obj_t* self, bool loop);