audiomp3: rename to MP3Decoder

1 files changed, 0 insertions, 352 deletions

diff --git a/shared-module/audiomp3/MP3File.c b/shared-module/audiomp3/MP3File.c
deleted file mode 100644
index 515aa0086..000000000
--- a/shared-module/audiomp3/MP3File.c
+++ /dev/null
@@ -1,352 +0,0 @@
-/*
- * This file is part of the Micro Python project, http://micropython.org/
- *
- * The MIT License (MIT)
- *
- * Copyright (c) 2018 Scott Shawcroft for Adafruit Industries
- * Copyright (c) 2019 Jeff Epler for Adafruit Industries
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- */
-
-#include "shared-bindings/audiomp3/MP3File.h"
-
-#include <stdint.h>
-#include <string.h>
-#include <math.h>
-
-#include "py/mperrno.h"
-#include "py/runtime.h"
-
-#include "shared-module/audiomp3/MP3File.h"
-#include "supervisor/shared/translate.h"
-#include "lib/mp3/src/mp3common.h"
-
-#define MAX_BUFFER_LEN (MAX_NSAMP * MAX_NGRAN * MAX_NCHAN * sizeof(int16_t))
-
-/** Fill the input buffer if it is less than half full.
- *
- * Returns true if the input buffer contains any useful data,
- * false otherwise.  (The input buffer will be padded to the end with
- * 0 bytes, which do not interfere with MP3 decoding)
- *
- * Raises OSError if f_read fails.
- *
- * Sets self->eof if any read of the file returns 0 bytes
- */
-STATIC bool mp3file_update_inbuf(audiomp3_mp3file_obj_t* self) {
-    // If buffer is over half full, do nothing
-    if (self->inbuf_offset < self->inbuf_length/2) return true;
-
-    // If we didn't previously reach the end of file, we can try reading now
-    if (!self->eof) {
-
-        // Move the unconsumed portion of the buffer to the start
-        uint8_t *end_of_buffer = self->inbuf + self->inbuf_length;
-        uint8_t *new_end_of_data = self->inbuf + self->inbuf_length - self->inbuf_offset;
-        memmove(self->inbuf, self->inbuf + self->inbuf_offset,
-            self->inbuf_length - self->inbuf_offset);
-        self->inbuf_offset = 0;
-
-        UINT to_read = end_of_buffer - new_end_of_data;
-        UINT bytes_read = 0;
-        memset(new_end_of_data, 0, to_read);
-        if (f_read(&self->file->fp, new_end_of_data, to_read, &bytes_read) != FR_OK) {
-            self->eof = true;
-            mp_raise_OSError(MP_EIO);
-        }
-
-        if (bytes_read == 0) {
-            self->eof = true;
-        }
-
-        if (to_read != bytes_read) {
-            new_end_of_data += bytes_read;
-            memset(new_end_of_data, 0, end_of_buffer - new_end_of_data);
-        }
-
-    }
-
-    // Return true iff there are at least some useful bytes in the buffer
-    return self->inbuf_offset < self->inbuf_length;
-}
-
-#define READ_PTR(self) (self->inbuf + self->inbuf_offset)
-#define BYTES_LEFT(self) (self->inbuf_length - self->inbuf_offset)
-#define CONSUME(self, n) (self->inbuf_offset += n)
-
-// http://id3.org/d3v2.3.0
-// http://id3.org/id3v2.3.0
-STATIC void mp3file_skip_id3v2(audiomp3_mp3file_obj_t* self) {
-    mp3file_update_inbuf(self);
-    if (BYTES_LEFT(self) < 10) {
-        return;
-    }
-    uint8_t *data = READ_PTR(self);
-    if (!(
-            data[0] == 'I' &&
-            data[1] == 'D' &&
-            data[2] == '3' &&
-            data[3] != 0xff &&
-            data[4] != 0xff &&
-            (data[5] & 0x1f) == 0 &&
-            (data[6] & 0x80) == 0 &&
-            (data[7] & 0x80) == 0 &&
-            (data[8] & 0x80) == 0 &&
-            (data[9] & 0x80) == 0)) {
-        return;
-    }
-    uint32_t size = (data[6] << 21) | (data[7] << 14) | (data[8] << 7) | (data[9]);
-    size += 10; // size excludes the "header" (but not the "extended header")
-    // First, deduct from size whatever is left in buffer
-    uint32_t to_consume = MIN(size, BYTES_LEFT(self));
-    CONSUME(self, to_consume);
-    size -= to_consume;
-
-    // Next, seek in the file after the header
-    f_lseek(&self->file->fp, f_tell(&self->file->fp) + size);
-    return;
-}
-
-/* If a sync word can be found, advance to it and return true.  Otherwise,
- * return false.
- */
-STATIC bool mp3file_find_sync_word(audiomp3_mp3file_obj_t* self) {
-    do {
-        mp3file_update_inbuf(self);
-        int offset = MP3FindSyncWord(READ_PTR(self), BYTES_LEFT(self));
-        if (offset >= 0) {
-            CONSUME(self, offset);
-            mp3file_update_inbuf(self);
-            return true;
-        }
-        CONSUME(self, MAX(0, BYTES_LEFT(self) - 16));
-    } while (!self->eof);
-    return false;
-}
-
-STATIC bool mp3file_get_next_frame_info(audiomp3_mp3file_obj_t* self, MP3FrameInfo* fi) {
-    int err;
-    do {
-        err = MP3GetNextFrameInfo(self->decoder, fi, READ_PTR(self));
-        if (err == ERR_MP3_NONE) {
-            break;
-        }
-        CONSUME(self, 1);
-        mp3file_find_sync_word(self);
-    } while (!self->eof);
-    return err == ERR_MP3_NONE;
-}
-
-void common_hal_audiomp3_mp3file_construct(audiomp3_mp3file_obj_t* self,
-                                           pyb_file_obj_t* file,
-                                           uint8_t *buffer,
-                                           size_t buffer_size) {
-    // XXX Adafruit_MP3 uses a 2kB input buffer and two 4kB output buffers.
-    // for a whopping total of 10kB buffers (+mp3 decoder state and frame buffer)
-    // At 44kHz, that's 23ms of output audio data.
-    //
-    // We will choose a slightly different allocation strategy for the output:
-    // Make sure the buffers are sized exactly to match (a multiple of) the
-    // frame size; this is typically 2304 * 2 bytes, so a little bit bigger
-    // than the two 4kB output buffers, except that the alignment allows to
-    // never allocate that extra frame buffer.
-
-    self->inbuf_length = 2048;
-    self->inbuf_offset = self->inbuf_length;
-    self->inbuf = m_malloc(self->inbuf_length, false);
-    if (self->inbuf == NULL) {
-        common_hal_audiomp3_mp3file_deinit(self);
-        mp_raise_msg(&mp_type_MemoryError,
-                     translate("Couldn't allocate input buffer"));
-    }
-    self->decoder = MP3InitDecoder();
-    if (self->decoder == NULL) {
-        common_hal_audiomp3_mp3file_deinit(self);
-        mp_raise_msg(&mp_type_MemoryError,
-                     translate("Couldn't allocate decoder"));
-    }
-
-    if ((intptr_t)buffer & 1) {
-        buffer += 1; buffer_size -= 1;
-    }
-    if (buffer_size >= 2 * MAX_BUFFER_LEN) {
-        self->buffers[0] = (int16_t*)(void*)buffer;
-        self->buffers[1] = (int16_t*)(void*)(buffer + MAX_BUFFER_LEN);
-    } else {
-        self->buffers[0] = m_malloc(MAX_BUFFER_LEN, false);
-        if (self->buffers[0] == NULL) {
-            common_hal_audiomp3_mp3file_deinit(self);
-            mp_raise_msg(&mp_type_MemoryError,
-                         translate("Couldn't allocate first buffer"));
-        }
-
-        self->buffers[1] = m_malloc(MAX_BUFFER_LEN, false);
-        if (self->buffers[1] == NULL) {
-            common_hal_audiomp3_mp3file_deinit(self);
-            mp_raise_msg(&mp_type_MemoryError,
-                         translate("Couldn't allocate second buffer"));
-        }
-    }
-
-    common_hal_audiomp3_mp3file_set_file(self, file);
-}
-
-void common_hal_audiomp3_mp3file_set_file(audiomp3_mp3file_obj_t* self, pyb_file_obj_t* file) {
-    self->file = file;
-    f_lseek(&self->file->fp, 0);
-    self->inbuf_offset = self->inbuf_length;
-    self->eof = 0;
-    self->other_channel = -1;
-    mp3file_update_inbuf(self);
-    mp3file_find_sync_word(self);
-    // It **SHOULD** not be necessary to do this; the buffer should be filled
-    // with fresh content before it is returned by get_buffer().  The fact that
-    // this is necessary to avoid a glitch at the start of playback of a second
-    // track using the same decoder object means there's still a bug in
-    // get_buffer() that I didn't understand.
-    memset(self->buffers[0], 0, MAX_BUFFER_LEN);
-    memset(self->buffers[1], 0, MAX_BUFFER_LEN);
-    MP3FrameInfo fi;
-    if(!mp3file_get_next_frame_info(self, &fi)) {
-        mp_raise_msg(&mp_type_RuntimeError,
-                     translate("Failed to parse MP3 file"));
-    }
-
-    self->sample_rate = fi.samprate;
-    self->channel_count = fi.nChans;
-    self->frame_buffer_size = fi.outputSamps*sizeof(int16_t);
-    self->len = 2 * self->frame_buffer_size;
-}
-
-void common_hal_audiomp3_mp3file_deinit(audiomp3_mp3file_obj_t* self) {
-    MP3FreeDecoder(self->decoder);
-    self->decoder = NULL;
-    self->inbuf = NULL;
-    self->buffers[0] = NULL;
-    self->buffers[1] = NULL;
-    self->file = NULL;
-}
-
-bool common_hal_audiomp3_mp3file_deinited(audiomp3_mp3file_obj_t* self) {
-    return self->buffers[0] == NULL;
-}
-
-uint32_t common_hal_audiomp3_mp3file_get_sample_rate(audiomp3_mp3file_obj_t* self) {
-    return self->sample_rate;
-}
-
-void common_hal_audiomp3_mp3file_set_sample_rate(audiomp3_mp3file_obj_t* self,
-                                                 uint32_t sample_rate) {
-    self->sample_rate = sample_rate;
-}
-
-uint8_t common_hal_audiomp3_mp3file_get_bits_per_sample(audiomp3_mp3file_obj_t* self) {
-    return 16;
-}
-
-uint8_t common_hal_audiomp3_mp3file_get_channel_count(audiomp3_mp3file_obj_t* self) {
-    return self->channel_count;
-}
-
-bool audiomp3_mp3file_samples_signed(audiomp3_mp3file_obj_t* self) {
-    return true;
-}
-
-void audiomp3_mp3file_reset_buffer(audiomp3_mp3file_obj_t* self,
-                                   bool single_channel,
-                                   uint8_t channel) {
-    if (single_channel && channel == 1) {
-        return;
-    }
-    // We don't reset the buffer index in case we're looping and we have an odd number of buffer
-    // loads
-    f_lseek(&self->file->fp, 0);
-    self->inbuf_offset = self->inbuf_length;
-    self->eof = 0;
-    self->other_channel = -1;
-    mp3file_update_inbuf(self);
-    mp3file_skip_id3v2(self);
-    mp3file_find_sync_word(self);
-}
-
-audioio_get_buffer_result_t audiomp3_mp3file_get_buffer(audiomp3_mp3file_obj_t* self,
-                                                        bool single_channel,
-                                                        uint8_t channel,
-                                                        uint8_t** bufptr,
-                                                        uint32_t* buffer_length) {
-    if (!self->inbuf) {
-        return GET_BUFFER_ERROR;
-    }
-    if (!single_channel) {
-        channel = 0;
-    }
-
-    *buffer_length = self->frame_buffer_size;
-
-    if (channel == self->other_channel) {
-        *bufptr = (uint8_t*)(self->buffers[self->other_buffer_index] + channel);
-        self->other_channel = -1;
-        return GET_BUFFER_MORE_DATA;
-    }
-
-
-    self->buffer_index = !self->buffer_index;
-    self->other_channel = 1-channel;
-    self->other_buffer_index = self->buffer_index;
-    int16_t *buffer = (int16_t *)(void *)self->buffers[self->buffer_index];
-    *bufptr = (uint8_t*)buffer;
-
-    mp3file_skip_id3v2(self);
-    if (!mp3file_find_sync_word(self)) {
-        return self->eof ? GET_BUFFER_DONE : GET_BUFFER_ERROR;
-    }
-    int bytes_left = BYTES_LEFT(self);
-    uint8_t *inbuf = READ_PTR(self);
-    int err = MP3Decode(self->decoder, &inbuf, &bytes_left, buffer, 0);
-    CONSUME(self, BYTES_LEFT(self) - bytes_left);
-    if (err) {
-        return GET_BUFFER_DONE;
-    }
-
-    return GET_BUFFER_MORE_DATA;
-}
-
-void audiomp3_mp3file_get_buffer_structure(audiomp3_mp3file_obj_t* self, bool single_channel,
-                                           bool* single_buffer, bool* samples_signed,
-                                           uint32_t* max_buffer_length, uint8_t* spacing) {
-    *single_buffer = false;
-    *samples_signed = true;
-    *max_buffer_length = self->frame_buffer_size;
-    if (single_channel) {
-        *spacing = self->channel_count;
-    } else {
-        *spacing = 1;
-    }
-}
-
-float common_hal_audiomp3_mp3file_get_rms_level(audiomp3_mp3file_obj_t* self) {
-    float sumsq = 0.f;
-    // Assumes no DC component to the audio.  Is that a safe assumption?
-    int16_t *buffer = (int16_t *)(void *)self->buffers[self->buffer_index];
-    for(size_t i=0; i<self->frame_buffer_size / sizeof(int16_t); i++) {
-        sumsq += (float)buffer[i] * buffer[i];
-    }
-    return sqrtf(sumsq) / (self->frame_buffer_size / sizeof(int16_t));
-}