mp3_libmad_player.c File Reference

#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include "compiler.h"
#include "file.h"
#include "conf_audio_player.h"
#include "audio_mixer.h"
#include "mad.h"
#include "reader_id3.h"
#include "com_task.h"
#include "navigation.h"
#include "audio_interface.h"

Data Structures
struct	mp3_play_data
	This is a private message structure. More...

Macros
#define	FILEPOSDELAY   4000
#define	MP3_MAX_DATA_REQUESTED   (2881 + MAD_BUFFER_GUARD)
	Maximal number of input bytes requested by the decoder at once. More...
#define	NBSAVFILEPOS   200
#define	OFFSETFILEPOS   50
#define	PCM_BUF_BYTE_SIZE   (PCM_BUF_SAMP_SIZE * 2 * sizeof(int16_t))
	Size of each PCM buffer in bytes. More...
#define	PCM_BUF_SAMP_SIZE   1152
	Size of each PCM buffer in samples per channel. More...

Functions
static enum mad_flow	error (void *data, struct mad_stream *stream, struct mad_frame *frame)
	This is the error callback function. More...
static enum mad_flow	header (void *data, struct mad_header const *header)
static enum mad_flow	input (void *data, struct mad_stream *stream)
	This is the input callback. More...
static enum mad_flow	output (void *data, const struct mad_header *header, struct mad_pcm *pcm)
	This is the output callback function. More...
bool	play_mp3 (const char *filename, bool verbose)
	This is the function called by ushell_task() to perform all the MP3 decoding. More...

Variables
uint16_t	cptms
uint16_t	FilePosPtr
uint32_t	g_player_currentTime_ms
uint32_t	g_player_duration
Ai_player_flag_t	g_player_flag
uint32_t	g_player_target_file_pos
uint8_t	g_smooth_com_cnt
uint32_t	time_goal
	This is the header callback function. More...
uint32_t	TimeStampOffset
uint32_t *	tSavFilePos

#define FILEPOSDELAY   4000

Referenced by header().

#define MP3_MAX_DATA_REQUESTED   (2881 + MAD_BUFFER_GUARD)

Maximal number of input bytes requested by the decoder at once.

Referenced by input(), and play_mp3().

#define NBSAVFILEPOS   200

Referenced by header(), and play_mp3().

#define OFFSETFILEPOS   50

Referenced by header().

#define PCM_BUF_BYTE_SIZE   (PCM_BUF_SAMP_SIZE * 2 * sizeof(int16_t))

Size of each PCM buffer in bytes.

Referenced by play_mp3().

#define PCM_BUF_SAMP_SIZE   1152

Size of each PCM buffer in samples per channel.

static enum mad_flow error ( void *  data, struct mad_stream *  stream, struct mad_frame *  frame  )

static

This is the error callback function.

It is called whenever a decoding error occurs. The error is indicated by stream->error; the list of possible MAD_ERROR_* errors can be found in the mad.h (or stream.h) header file.

References data, mad_stream::error, mp3_play_data::frame_buf_guard, MAD_ERROR_LOSTSYNC, MAD_FLOW_CONTINUE, mad_stream::this_frame, and mp3_play_data::verbose.

Referenced by et024006_DrawFilledCircle(), and play_mp3().

static enum mad_flow header ( void *  data, struct mad_header const *  header  )

static

References cptms, data, mad_header::duration, file_seek(), FILEPOSDELAY, FilePosPtr, mad_timer_t::fraction, FS_SEEK_SET, g_player_currentTime_ms, g_player_duration, g_player_target_file_pos, MAD_FLOW_CONTINUE, MAD_FLOW_IGNORE, MAD_TIMER_RESOLUTION, mp3_play_data::mp3_pos, mp3_play_data::mp3_start_file_pos, NBSAVFILEPOS, OFFSETFILEPOS, PLAYER_FLAG_FFW, PLAYER_FLAG_FRW, PLAYER_FLAG_NORMAL, Ai_player_flag_t::status_fast, time_goal, TimeStampOffset, and tSavFilePos.

Referenced by play_mp3().

static enum mad_flow input ( void *  data, struct mad_stream *  stream  )

static

This is the input callback.

The purpose of this callback is to (re)fill the stream buffer which is to be decoded.

References data, file_eof(), file_getpos(), file_read_buf(), mp3_play_data::frame_buf, mp3_play_data::frame_buf_data_size, mp3_play_data::frame_buf_end, mp3_play_data::frame_buf_guard, MAD_BUFFER_GUARD, MAD_FLOW_BREAK, MAD_FLOW_CONTINUE, MAD_FLOW_STOP, mad_stream_buffer(), mp3_play_data::mp3_end_file_pos, MP3_MAX_DATA_REQUESTED, mp3_play_data::mp3_pos, nav_checkdisk_disable(), nav_checkdisk_enable(), mad_stream::next_frame, PLAYER_FLAG_STOP, Ai_player_flag_t::status, and mp3_play_data::unrecoverable_error.

static enum mad_flow output ( void *  data, const struct mad_header *  header, struct mad_pcm *  pcm  )

static

This is the output callback function.

It is called after each frame of MPEG audio data has been completely decoded. The purpose of this callback is to output (or play) the decoded PCM audio.

References audio_mixer_dacs_flush, audio_mixer_dacs_output, audio_mixer_dacs_setup, audio_mixer_get_buffer, audio_mixer_mute_audio, mad_pcm::channels, com_task(), data, mad_header::duration, mp3_play_data::duration_played, fat_check_mount_select_open(), FS_NAV_ID_AUDIO, g_smooth_com_cnt, mad_pcm::length, MAD_FLOW_CONTINUE, MAD_FLOW_STOP, mad_timer_add(), mad_timer_compare(), mad_timer_zero, nav_select(), PLAYER_FLAG_NORMAL, PLAYER_FLAG_PAUSE, PLAYER_FLAG_PLAY, PLAYER_FLAG_STOP, mad_pcm::samplerate, mad_pcm::samples, Ai_player_flag_t::status, and Ai_player_flag_t::status_fast.

bool play_mp3	(	const char *	filename,
		bool	verbose
	)

This is the function called by ushell_task() to perform all the MP3 decoding.

Returns

false in case of error, otherwise return true.

It instantiates a decoder object and configures it with the input, output, and error callback functions above. A single call to mad_decoder_run() continues until a callback function returns MAD_FLOW_STOP (to stop decoding) or MAD_FLOW_BREAK (to stop decoding and signal an error).

References St_id3size::appended_tag, audio_mixer_close, audio_mixer_create_buffers, audio_mixer_dacs_flush, cptms, error(), file_close(), file_open(), file_seek(), filename, FilePosPtr, FOPEN_MODE_R, mp3_play_data::frame_buf, mp3_play_data::frame_buf_end, mp3_play_data::frame_buf_guard, FS_NAV_ID_AUDIO, FS_SEEK_SET, header(), input, mad_decoder_finish(), mad_decoder_init(), MAD_DECODER_MODE_SYNC, mad_decoder_run(), mad_timer_zero, mp3_play_data::mp3_end_file_pos, MP3_MAX_DATA_REQUESTED, mp3_play_data::mp3_start_file_pos, nav_file_lgt(), nav_select(), NBSAVFILEPOS, output, PCM_BUF_BYTE_SIZE, St_id3size::prepended_tag, reader_id3_size(), time_goal, TimeStampOffset, tSavFilePos, and mp3_play_data::unrecoverable_error.

Referenced by codec_mp3_task().

uint16_t cptms

Referenced by header(), and play_mp3().

uint16_t FilePosPtr

Referenced by header(), and play_mp3().

uint32_t g_player_currentTime_ms

Referenced by header().

uint32_t g_player_duration

Referenced by header().

Ai_player_flag_t g_player_flag

uint32_t g_player_target_file_pos

Referenced by header().

uint8_t g_smooth_com_cnt

Referenced by output().

uint32_t time_goal

This is the header callback function.

It is called whenever a asf header is found

Referenced by header(), and play_mp3().

uint32_t TimeStampOffset

Referenced by header(), and play_mp3().

uint32_t* tSavFilePos

Referenced by header(), and play_mp3().