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mcd, add dr_mp3 playback support

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kub 2021-04-16 21:31:30 +02:00
parent c9a715c777
commit eba9396473
4 changed files with 71 additions and 1 deletions
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3
.gitmodules vendored
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@ -13,3 +13,6 @@
[submodule "platform/common/minimp3"]
path = platform/common/minimp3
url = https://github.com/lieff/minimp3
[submodule "platform/common/dr_libs"]
path = platform/common/dr_libs
url = https://github.com/mackron/dr_libs

3
Makefile
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@ -245,7 +245,8 @@ OBJS += platform/common/mp3_helix.o
else ifeq "$(HAVE_LIBAVCODEC)" "1"
OBJS += platform/common/mp3_libavcodec.o
else
OBJS += platform/common/mp3_minimp3.o
#OBJS += platform/common/mp3_minimp3.o
OBJS += platform/common/mp3_drmp3.o
endif
endif

1
platform/common/dr_libs Submodule

@ -0,0 +1 @@
Subproject commit 343aa923439e59e7a9f7726f70edc77a4500bdec

65
platform/common/mp3_drmp3.c Normal file
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@ -0,0 +1,65 @@
/*
* MP3 decoding using dr_mp3
* (C) kub, 2020
*
* This work is licensed under the terms of MAME license.
* See COPYING file in the top-level directory.
*/
#include <stdio.h>
#include <pico/pico_int.h>
#define DR_MP3_IMPLEMENTATION
#include "dr_libs/dr_mp3.h"
#include "mp3.h"
static drmp3dec mp3dec;
static unsigned char mp3_input_buffer[2 * 1024];
int mp3dec_start(FILE *f, int fpos_start)
{
drmp3dec_init(&mp3dec);
return 0;
}
int mp3dec_decode(FILE *f, int *file_pos, int file_len)
{
drmp3dec_frame_info info;
unsigned char *readPtr;
int bytesLeft;
int offset; // mp3 frame offset from readPtr
int len;
int retry = 3;
do
{
if (*file_pos >= file_len)
return 1; /* EOF, nothing to do */
fseek(f, *file_pos, SEEK_SET);
bytesLeft = fread(mp3_input_buffer, 1, sizeof(mp3_input_buffer), f);
offset = mp3_find_sync_word(mp3_input_buffer, bytesLeft);
if (offset < 0) {
lprintf("find_sync_word (%i/%i) err %i\n",
*file_pos, file_len, offset);
*file_pos = file_len;
return 1; // EOF
}
*file_pos += offset;
readPtr = mp3_input_buffer + offset;
bytesLeft -= offset;
len = drmp3dec_decode_frame(&mp3dec, readPtr, bytesLeft, cdda_out_buffer, &info);
if (len > 0) // retrieved decoded data
*file_pos += info.frame_bytes;
else if (info.frame_bytes > 0) // no output but input consumed?
*file_pos += 1; // try to skip frame
else if (offset == 0) // bad frame?
*file_pos += 1; // try resyncing
// else // truncated frame, try more data
}
while (len <= 0 && --retry > 0);
return len <= 0;
}