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rockbox/firmware/pcm_record.c
Michael Sevakis 36c940555c SWCODEC recording: More cleanup of stuff after queue additions and audio driver unification. 
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@11783 a1c6a512-1295-4272-9138-f99709370657
2006-12-17 11:03:19 +00:00

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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2005 by Linus Nielsen Feltzing
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "system.h"
#include "kernel.h"
#include "logf.h"
#include "thread.h"
#include <string.h>
#include "ata.h"
#include "usb.h"
#include "buffer.h"
#include "general.h"
#include "audio.h"
#include "sound.h"
#include "id3.h"
#ifdef HAVE_SPDIF_IN
#include "spdif.h"
#endif
/***************************************************************************/
/**
* APIs implemented in the target tree portion:
* Public -
* pcm_init_recording
* pcm_close_recording
* Semi-private -
* pcm_rec_dma_start
* pcm_rec_dma_stop
*/
/** These items may be implemented target specifically or need to
be shared semi-privately **/
/* the registered callback function for when more data is available */
volatile pcm_more_callback_type2 pcm_callback_more_ready = NULL;
/* DMA transfer in is currently active */
volatile bool pcm_recording = false;
/** General recording state **/
static bool is_recording; /* We are recording */
static bool is_paused; /* We have paused */
static unsigned long errors; /* An error has occured */
static unsigned long warnings; /* Warning */
/** Stats on encoded data for current file **/
static size_t num_rec_bytes; /* Num bytes recorded */
static unsigned long num_rec_samples; /* Number of PCM samples recorded */
/** Stats on encoded data for all files from start to stop **/
#if 0
static unsigned long long accum_rec_bytes; /* total size written to chunks */
static unsigned long long accum_pcm_samples; /* total pcm count processed */
#endif
/* Keeps data about current file and is sent as event data for codec */
static struct enc_file_event_data rec_fdata IDATA_ATTR =
{
.chunk = NULL,
.new_enc_size = 0,
.new_num_pcm = 0,
.rec_file = -1,
.num_pcm_samples = 0
};
/** These apply to current settings **/
static int rec_source; /* current rec_source setting */
static int rec_frequency; /* current frequency setting */
static unsigned long sample_rate; /* Sample rate in HZ */
static int num_channels; /* Current number of channels */
static struct encoder_config enc_config; /* Current encoder configuration */
static unsigned long pre_record_ticks; /* pre-record time in ticks */
/****************************************************************************
use 2 circular buffers:
pcm_buffer=DMA output buffer: chunks (8192 Bytes) of raw pcm audio data
enc_buffer=encoded audio buffer: storage for encoder output data
Flow:
1. when entering recording_screen DMA feeds the ringbuffer pcm_buffer
2. if enough pcm data are available the encoder codec does encoding of pcm
chunks (4-8192 Bytes) into ringbuffer enc_buffer in codec_thread
3. pcmrec_callback detects enc_buffer 'near full' and writes data to disk
Functions calls (basic encoder steps):
1.main: audio_load_encoder(); start the encoder
2.encoder: enc_get_inputs(); get encoder recording settings
3.encoder: enc_set_parameters(); set the encoder parameters
4.encoder: enc_get_pcm_data(); get n bytes of unprocessed pcm data
5.encoder: enc_unget_pcm_data(); put n bytes of data back (optional)
6.encoder: enc_pcm_buf_near_empty(); if !0: reduce cpu_boost
7.encoder: enc_get_chunk(); get a ptr to next enc chunk
8.encoder: <process enc chunk> compress and store data to enc chunk
9.encoder: enc_finish_chunk(); inform main about chunk processed and
is available to be written to a file.
Encoder can place any number of chunks
of PCM data in a single output chunk
but must stay within its output chunk
size
A.encoder: repeat 4. to 9.
B.pcmrec: enc_events_callback(); called for certain events
(*) Optional step
****************************************************************************/
/** buffer parameters where incoming PCM data is placed **/
#define PCM_NUM_CHUNKS 256 /* Power of 2 */
#define PCM_CHUNK_SIZE 8192 /* Power of 2 */
#define PCM_CHUNK_MASK (PCM_NUM_CHUNKS*PCM_CHUNK_SIZE - 1)
#define GET_PCM_CHUNK(offset) ((long *)(pcm_buffer + (offset)))
#define GET_ENC_CHUNK(index) ENC_CHUNK_HDR(enc_buffer + enc_chunk_size*(index))
#ifdef PCMREC_PARANOID
static void paranoid_set_code(unsigned long code, int line)
{
logf("%08X at %d", code, line);
if ((long)code < 0)
errors |= code;
else
warnings |= code;
}
#define PARANOID_ENC_INDEX_CHECK(index) \
{ if (index != index##_last) \
paranoid_set_code((&index == &enc_rd_index) ? \
PCMREC_E_ENC_RD_INDEX_TRASHED : PCMREC_E_ENC_WR_INDEX_TRASHED, \
__LINE__); }
#define PARANOID_PCM_POS_CHECK(pos) \
{ if (pos != pos##_last) \
paranoid_set_code((&pos == &pcm_rd_pos) ? \
PCMREC_W_PCM_RD_POS_TRASHED : PCMREC_W_DMA_WR_POS_TRASHED, \
__LINE__); }
#define PARANOID_SET_LAST(var) \
; var##_last = var
#define PARANOID_CHUNK_CHECK(chunk) \
paranoid_chunk_check(chunk)
#else
#define PARANOID_ENC_INDEX_CHECK(index)
#define PARANOID_PCM_POS_CHECK(pos)
#define PARANOID_SET_LAST(var)
#define PARANOID_CHUNK_CHECK(chunk)
#endif
#define INC_ENC_INDEX(index) \
PARANOID_ENC_INDEX_CHECK(index) \
{ if (++index >= enc_num_chunks) index = 0; } \
PARANOID_SET_LAST(index)
#define DEC_ENC_INDEX(index) \
PARANOID_ENC_INDEX_CHECK(index) \
{ if (--index < 0) index = enc_num_chunks - 1; } \
PARANOID_SET_LAST(index)
#define SET_ENC_INDEX(index, value) \
PARANOID_ENC_INDEX_CHECK(index) \
index = value \
PARANOID_SET_LAST(index)
#define SET_PCM_POS(pos, value) \
PARANOID_PCM_POS_CHECK(pos) \
pos = value \
PARANOID_SET_LAST(pos)
static size_t rec_buffer_size; /* size of available buffer */
static unsigned char *pcm_buffer; /* circular recording buffer */
static unsigned char *enc_buffer; /* circular encoding buffer */
static volatile int dma_wr_pos; /* current DMA write pos */
static int pcm_rd_pos; /* current PCM read pos */
static volatile bool dma_lock; /* lock DMA write position */
static int enc_wr_index; /* encoder chunk write index */
static int enc_rd_index; /* encoder chunk read index */
static int enc_num_chunks; /* number of chunks in ringbuffer */
static size_t enc_chunk_size; /* maximum encoder chunk size */
static unsigned long enc_sample_rate; /* sample rate used by encoder */
static bool wav_queue_empty; /* all wav chunks processed? */
/** file flushing **/
static int write_threshold; /* max chunk limit for data flush */
static int panic_threshold; /* boost thread prio when here */
static int spinup_time = -1;/* last ata_spinup_time */
/** encoder events **/
static void (*enc_events_callback)(enum enc_events event, void *data);
/** Path queue for files to write **/
#define FNQ_MIN_NUM_PATHS 16 /* minimum number of paths to hold */
static unsigned char *fn_queue; /* pointer to first filename */
static ssize_t fnq_size; /* capacity of queue in bytes */
static int fnq_rd_pos; /* current read position */
static int fnq_wr_pos; /* current write position */
/** extra debugging info positioned away from other vars **/
#ifdef PCMREC_PARANOID
static unsigned long *wrap_id_p; /* magic at end of encoding buffer */
static volatile int dma_wr_pos_last; /* previous dma write position */
static int pcm_rd_pos_last; /* previous pcm read position */
static int enc_rd_index_last; /* previsou encoder read position */
static int enc_wr_index_last; /* previsou encoder read position */
#endif
/***************************************************************************/
static struct event_queue pcmrec_queue;
static struct queue_sender_list pcmrec_queue_send;
static long pcmrec_stack[3*DEFAULT_STACK_SIZE/sizeof(long)];
static const char pcmrec_thread_name[] = "pcmrec";
static void pcmrec_thread(void);
enum
{
PCMREC_NULL = 0,
PCMREC_INIT, /* enable recording */
PCMREC_CLOSE, /* close recording */
PCMREC_OPTIONS, /* set recording options */
PCMREC_RECORD, /* record a new file */
PCMREC_STOP, /* stop the current recording */
PCMREC_PAUSE, /* pause the current recording */
PCMREC_RESUME, /* resume the current recording */
#if 0
PCMREC_FLUSH_NUM, /* flush a number of files out */
#endif
};
/*******************************************************************/
/* Functions that are not executing in the pcmrec_thread first */
/*******************************************************************/
/* Callback for when more data is ready - called in interrupt context */
static int pcm_rec_have_more(int status)
{
if (status < 0)
{
/* some error condition */
if (status == DMA_REC_ERROR_DMA)
{
/* Flush recorded data to disk and stop recording */
queue_post(&pcmrec_queue, PCMREC_STOP, NULL);
return -1;
}
/* else try again next transmission */
}
else if (!dma_lock)
{
/* advance write position */
int next_pos = (dma_wr_pos + PCM_CHUNK_SIZE) & PCM_CHUNK_MASK;
/* set pcm ovf if read position is inside current write chunk */
if ((unsigned)(pcm_rd_pos - next_pos) < PCM_CHUNK_SIZE)
warnings |= PCMREC_W_PCM_BUFFER_OVF;
#ifdef PCMREC_PARANOID
/* write position must always be on PCM_CHUNK_SIZE boundary -
anything else is corruption */
if (next_pos & (PCM_CHUNK_SIZE-1))
{
logf("dma_wr_pos unalgn: %d", next_pos);
warnings |= PCMREC_W_DMA_WR_POS_ALIGN;
next_pos &= ~PCM_CHUNK_SIZE; /* re-align */
}
#endif
SET_PCM_POS(dma_wr_pos, next_pos);
}
pcm_record_more(GET_PCM_CHUNK(dma_wr_pos), PCM_CHUNK_SIZE);
return 0;
} /* pcm_rec_have_more */
static void reset_hardware(void)
{
/* reset pcm to defaults (playback only) */
pcm_set_frequency(HW_SAMPR_DEFAULT);
audio_set_output_source(AUDIO_SRC_PLAYBACK);
pcm_apply_settings(true);
}
/** pcm_rec_* group **/
/**
* Clear all errors and warnings
*/
void pcm_rec_error_clear(void)
{
errors = warnings = 0;
} /* pcm_rec_error_clear */
/**
* Check mode, errors and warnings
*/
unsigned long pcm_rec_status(void)
{
unsigned long ret = 0;
if (is_recording)
ret |= AUDIO_STATUS_RECORD;
else if (pre_record_ticks)
ret |= AUDIO_STATUS_PRERECORD;
if (is_paused)
ret |= AUDIO_STATUS_PAUSE;
if (errors)
ret |= AUDIO_STATUS_ERROR;
if (warnings)
ret |= AUDIO_STATUS_WARNING;
return ret;
} /* pcm_rec_status */
/**
* Return warnings that have occured since recording started
*/
unsigned long pcm_rec_get_warnings(void)
{
return warnings;
}
#if 0
int pcm_rec_current_bitrate(void)
{
if (accum_pcm_samples == 0)
return 0;
return (int)(8*accum_rec_bytes*enc_sample_rate / (1000*accum_pcm_samples));
} /* pcm_rec_current_bitrate */
#endif
#if 0
int pcm_rec_encoder_afmt(void)
{
return enc_config.afmt;
} /* pcm_rec_encoder_afmt */
#endif
#if 0
int pcm_rec_rec_format(void)
{
return afmt_rec_format[enc_config.afmt];
} /* pcm_rec_rec_format */
#endif
#ifdef HAVE_SPDIF_IN
unsigned long pcm_rec_sample_rate(void)
{
/* Which is better ?? */
#if 0
return enc_sample_rate;
#endif
return sample_rate;
} /* audio_get_sample_rate */
#endif
/**
* Creates pcmrec_thread
*/
void pcm_rec_init(void)
{
queue_init(&pcmrec_queue, true);
queue_enable_queue_send(&pcmrec_queue, &pcmrec_queue_send);
create_thread(pcmrec_thread, pcmrec_stack, sizeof(pcmrec_stack),
pcmrec_thread_name, PRIORITY_RECORDING);
} /* pcm_rec_init */
/** audio_* group **/
/* NOTE: The following posting functions are really only single-thread safe
at the moment since a response to a particular message at a particular
position in the queue can't be distinguished */
/**
* Initializes recording - call before calling any other recording function
*/
void audio_init_recording(unsigned int buffer_offset)
{
logf("audio_init_recording");
queue_send(&pcmrec_queue, PCMREC_INIT, NULL);
logf("audio_init_recording done");
(void)buffer_offset;
} /* audio_init_recording */
/**
* Closes recording - call audio_stop_recording first
*/
void audio_close_recording(void)
{
logf("audio_close_recording");
queue_send(&pcmrec_queue, PCMREC_CLOSE, NULL);
logf("audio_close_recording done");
} /* audio_close_recording */
/**
* Sets recording parameters
*/
void audio_set_recording_options(struct audio_recording_options *options)
{
logf("audio_set_recording_options");
queue_send(&pcmrec_queue, PCMREC_OPTIONS, (void *)options);
logf("audio_set_recording_options done");
} /* audio_set_recording_options */
/**
* Start recording if not recording or else split
*/
void audio_record(const char *filename)
{
logf("audio_record: %s", filename);
queue_send(&pcmrec_queue, PCMREC_RECORD, (void *)filename);
logf("audio_record_done");
} /* audio_record */
/**
* Stop current recording if recording
*/
void audio_stop_recording(void)
{
logf("audio_stop_recording");
queue_send(&pcmrec_queue, PCMREC_STOP, NULL);
logf("audio_stop_recording done");
} /* audio_stop_recording */
/**
* Pause current recording
*/
void audio_pause_recording(void)
{
logf("audio_pause_recording");
queue_send(&pcmrec_queue, PCMREC_PAUSE, NULL);
logf("audio_pause_recording done");
} /* audio_pause_recording */
/**
* Resume current recording if paused
*/
void audio_resume_recording(void)
{
logf("audio_resume_recording");
queue_send(&pcmrec_queue, PCMREC_RESUME, NULL);
logf("audio_resume_recording done");
} /* audio_resume_recording */
/**
* Note that microphone is mono, only left value is used
* See audiohw_set_recvol() for exact ranges.
*
* @param type AUDIO_GAIN_MIC, AUDIO_GAIN_LINEIN
*
*/
void audio_set_recording_gain(int left, int right, int type)
{
//logf("rcmrec: t=%d l=%d r=%d", type, left, right);
audiohw_set_recvol(left, right, type);
} /* audio_set_recording_gain */
/** Information about current state **/
/**
* Return current recorded time in ticks (playback eqivalent time)
*/
unsigned long audio_recorded_time(void)
{
if (!is_recording || enc_sample_rate == 0)
return 0;
/* return actual recorded time a la encoded data even if encoder rate
doesn't match the pcm rate */
return (long)(HZ*(unsigned long long)num_rec_samples / enc_sample_rate);
} /* audio_recorded_time */
/**
* Return number of bytes encoded to output
*/
unsigned long audio_num_recorded_bytes(void)
{
if (!is_recording)
return 0;
return num_rec_bytes;
} /* audio_num_recorded_bytes */
#ifdef HAVE_SPDIF_IN
/**
* Return SPDIF sample rate index in audio_master_sampr_list. Since we base
* our reading on the actual SPDIF sample rate (which might be a bit
* inaccurate), we round off to the closest sample rate that is supported by
* SPDIF.
*/
int audio_get_spdif_sample_rate(void)
{
unsigned long measured_rate = spdif_measure_frequency();
/* Find which SPDIF sample rate we're closest to. */
return round_value_to_list32(measured_rate, audio_master_sampr_list,
SAMPR_NUM_FREQ, false);
} /* audio_get_spdif_sample_rate */
#endif /* HAVE_SPDIF_IN */
/***************************************************************************/
/* */
/* Functions that execute in the context of pcmrec_thread */
/* */
/***************************************************************************/
/** Filename Queue **/
/* returns true if the queue is empty */
static inline bool pcmrec_fnq_is_empty(void)
{
return fnq_rd_pos == fnq_wr_pos;
} /* pcmrec_fnq_is_empty */
/* empties the filename queue */
static inline void pcmrec_fnq_set_empty(void)
{
fnq_rd_pos = fnq_wr_pos;
} /* pcmrec_fnq_set_empty */
/* returns true if the queue is full */
static bool pcmrec_fnq_is_full(void)
{
ssize_t size = fnq_wr_pos - fnq_rd_pos;
if (size < 0)
size += fnq_size;
return size >= fnq_size - MAX_PATH;
} /* pcmrec_fnq_is_full */
/* queue another filename - will overwrite oldest one if full */
static bool pcmrec_fnq_add_filename(const char *filename)
{
strncpy(fn_queue + fnq_wr_pos, filename, MAX_PATH);
if ((fnq_wr_pos += MAX_PATH) >= fnq_size)
fnq_wr_pos = 0;
if (fnq_rd_pos != fnq_wr_pos)
return true;
/* queue full */
if ((fnq_rd_pos += MAX_PATH) >= fnq_size)
fnq_rd_pos = 0;
return true;
} /* pcmrec_fnq_add_filename */
/* replace the last filename added */
static bool pcmrec_fnq_replace_tail(const char *filename)
{
int pos;
if (pcmrec_fnq_is_empty())
return false;
pos = fnq_wr_pos - MAX_PATH;
if (pos < 0)
pos = fnq_size - MAX_PATH;
strncpy(fn_queue + pos, filename, MAX_PATH);
return true;
} /* pcmrec_fnq_replace_tail */
/* pulls the next filename from the queue */
static bool pcmrec_fnq_get_filename(char *filename)
{
if (pcmrec_fnq_is_empty())
return false;
if (filename)
strncpy(filename, fn_queue + fnq_rd_pos, MAX_PATH);
if ((fnq_rd_pos += MAX_PATH) >= fnq_size)
fnq_rd_pos = 0;
return true;
} /* pcmrec_fnq_get_filename */
/* close the file number pointed to by fd_p */
static void pcmrec_close_file(int *fd_p)
{
if (*fd_p < 0)
return; /* preserve error */
close(*fd_p);
*fd_p = -1;
} /* pcmrec_close_file */
#ifdef PCMREC_PARANOID
static void paranoid_chunk_check(const struct enc_chunk_hdr *chunk)
{
/* check integrity of things that must be ok - data or not */
/* check magic in header */
if (chunk->id != ENC_CHUNK_MAGIC)
{
errors |= PCMREC_E_BAD_CHUNK | PCMREC_E_CHUNK_OVF;
logf("bad chunk: %d", chunk - (struct enc_chunk_hdr *)enc_buffer);
}
/* check magic wrap id */
if (*wrap_id_p != ENC_CHUNK_MAGIC)
{
errors |= PCMREC_E_BAD_CHUNK | PCMREC_E_CHUNK_OVF;
logf("bad magic at wrap pos");
}
if (chunk->enc_data == NULL) /* has data? */
return;
/* check that data points to something after header */
if (chunk->enc_data < ENC_CHUNK_SKIP_HDR(chunk->enc_data, chunk))
{
errors |= PCMREC_E_BAD_CHUNK;
logf("chk ptr < hdr end");
}
/* check if data end is within chunk */
if (chunk->enc_data + chunk->enc_size >
(unsigned char *)chunk + enc_chunk_size)
{
errors |= PCMREC_E_BAD_CHUNK;
logf("chk data > chk end");
}
if ((chunk->flags & ~CHUNKF_ALLFLAGS) != 0)
{
errors |= PCMREC_E_BAD_CHUNK;
logf("chk bad flags %08X", chunk->flags);
}
} /* paranoid_chunk_check */
#endif /* PCMREC_PARANOID */
/** Data Flushing **/
/**
* called after callback to update sizes if codec changed the amount of data
* a chunk represents
*/
static inline void pcmrec_update_sizes_inl(size_t prev_enc_size,
unsigned long prev_num_pcm)
{
if (rec_fdata.new_enc_size != prev_enc_size)
{
ssize_t size_diff = rec_fdata.new_enc_size - prev_enc_size;
num_rec_bytes += size_diff;
#if 0
accum_rec_bytes += size_diff;
#endif
}
if (rec_fdata.new_num_pcm != prev_num_pcm)
{
unsigned long pcm_diff = rec_fdata.new_num_pcm - prev_num_pcm;
num_rec_samples += pcm_diff;
#if 0
accum_pcm_samples += pcm_diff;
#endif
}
} /* pcmrec_update_sizes_inl */
/* don't need to inline every instance */
static void pcmrec_update_sizes(size_t prev_enc_size,
unsigned long prev_num_pcm)
{
pcmrec_update_sizes_inl(prev_enc_size, prev_num_pcm);
} /* pcmrec_update_sizes */
static void pcmrec_start_file(void)
{
size_t enc_size = rec_fdata.new_enc_size;
unsigned long num_pcm = rec_fdata.new_num_pcm;
int curr_rec_file = rec_fdata.rec_file;
char filename[MAX_PATH];
/* must always pull the filename that matches with this queue */
if (!pcmrec_fnq_get_filename(filename))
{
logf("start file: fnq empty");
*filename = '\0';
errors |= PCMREC_E_FNQ_DESYNC;
}
else if (errors != 0)
{
logf("start file: error already");
}
else if (curr_rec_file >= 0)
{
/* Any previous file should have been closed */
logf("start file: file already open");
errors |= PCMREC_E_FNQ_DESYNC;
}
if (errors != 0)
rec_fdata.chunk->flags |= CHUNKF_ERROR;
/* encoder can set error flag here and should increase
enc_new_size and pcm_new_size to reflect additional
data written if any */
rec_fdata.filename = filename;
enc_events_callback(ENC_START_FILE, &rec_fdata);
if (errors == 0 && (rec_fdata.chunk->flags & CHUNKF_ERROR))
{
logf("start file: enc error");
errors |= PCMREC_E_ENCODER;
}
if (errors != 0)
{
pcmrec_close_file(&curr_rec_file);
/* Write no more to this file */
rec_fdata.chunk->flags |= CHUNKF_END_FILE;
}
else
{
pcmrec_update_sizes(enc_size, num_pcm);
}
rec_fdata.chunk->flags &= ~CHUNKF_START_FILE;
} /* pcmrec_start_file */
static inline void pcmrec_write_chunk(void)
{
size_t enc_size = rec_fdata.new_enc_size;
unsigned long num_pcm = rec_fdata.new_num_pcm;
if (errors != 0)
rec_fdata.chunk->flags |= CHUNKF_ERROR;
enc_events_callback(ENC_WRITE_CHUNK, &rec_fdata);
if ((long)rec_fdata.chunk->flags >= 0)
{
pcmrec_update_sizes_inl(enc_size, num_pcm);
}
else if (errors == 0)
{
logf("wr chk enc error %d %d",
rec_fdata.chunk->enc_size, rec_fdata.chunk->num_pcm);
errors |= PCMREC_E_ENCODER;
}
} /* pcmrec_write_chunk */
static void pcmrec_end_file(void)
{
/* all data in output buffer for current file will have been
written and encoder can now do any nescessary steps to
finalize the written file */
size_t enc_size = rec_fdata.new_enc_size;
unsigned long num_pcm = rec_fdata.new_num_pcm;
enc_events_callback(ENC_END_FILE, &rec_fdata);
if (errors == 0)
{
if (rec_fdata.chunk->flags & CHUNKF_ERROR)
{
logf("end file: enc error");
errors |= PCMREC_E_ENCODER;
}
else
{
pcmrec_update_sizes(enc_size, num_pcm);
}
}
/* Force file close if error */
if (errors != 0)
pcmrec_close_file(&rec_fdata.rec_file);
rec_fdata.chunk->flags &= ~CHUNKF_END_FILE;
} /* pcmrec_end_file */
/**
* Process the chunks
*
* This function is called when queue_get_w_tmo times out.
*
* Set flush_num to the number of files to flush to disk.
* flush_num = -1 to flush all available chunks to disk.
* flush_num = 0 normal write thresholding
* flush_num = 1 or greater - all available chunks of current file plus
* flush_num file starts if first chunk has been processed.
*
*/
static void pcmrec_flush(unsigned flush_num)
{
static unsigned long last_flush_tick = 0;
unsigned long start_tick;
int num_ready, num;
int prio;
int i;
num_ready = enc_wr_index - enc_rd_index;
if (num_ready < 0)
num_ready += enc_num_chunks;
num = num_ready;
if (flush_num == 0)
{
if (!is_recording)
return;
if (ata_spinup_time != spinup_time)
{
/* spinup time has changed, calculate new write threshold */
logf("new t spinup : %d", ata_spinup_time);
unsigned long st = spinup_time = ata_spinup_time;
/* write at 5s + st remaining in enc_buffer */
if (st < 2*HZ)
st = 2*HZ; /* my drive is usually < 250 ticks :) */
else if (st > 10*HZ)
st = 10*HZ;
write_threshold = enc_num_chunks -
(int)(((5ull*HZ + st)*4ull*sample_rate + (enc_chunk_size-1)) /
(enc_chunk_size*HZ));
if (write_threshold < 0)
write_threshold = 0;
else if (write_threshold > panic_threshold)
write_threshold = panic_threshold;
logf("new wr thresh: %d", write_threshold);
}
if (num_ready < write_threshold)
return;
/* if we're getting called too much and this isn't forced,
boost stat */
if (current_tick - last_flush_tick < HZ/2)
num = panic_threshold;
}
start_tick = current_tick;
prio = -1;
logf("writing: %d (%d)", num_ready, flush_num);
cpu_boost(true);
for (i = 0; i < num_ready; i++)
{
if (prio == -1 && (num >= panic_threshold ||
current_tick - start_tick > 10*HZ))
{
/* losing ground - boost priority until finished */
logf("pcmrec: boost priority");
prio = thread_set_priority(NULL, thread_get_priority(NULL)-1);
}
rec_fdata.chunk = GET_ENC_CHUNK(enc_rd_index);
rec_fdata.new_enc_size = rec_fdata.chunk->enc_size;
rec_fdata.new_num_pcm = rec_fdata.chunk->num_pcm;
PARANOID_CHUNK_CHECK(rec_fdata.chunk);
if (rec_fdata.chunk->flags & CHUNKF_START_FILE)
{
pcmrec_start_file();
if (--flush_num == 0)
i = num_ready; /* stop on next loop - must write this
chunk if it has data */
}
pcmrec_write_chunk();
if (rec_fdata.chunk->flags & CHUNKF_END_FILE)
pcmrec_end_file();
INC_ENC_INDEX(enc_rd_index);
if (errors != 0)
break;
if (prio == -1)
{
num = enc_wr_index - enc_rd_index;
if (num < 0)
num += enc_num_chunks;
}
/* no yielding, the file apis called in the codecs do that */
} /* end for */
/* sync file */
if (rec_fdata.rec_file >= 0)
fsync(rec_fdata.rec_file);
cpu_boost(false);
if (prio != -1)
{
/* return to original priority */
logf("pcmrec: unboost priority");
thread_set_priority(NULL, prio);
}
last_flush_tick = current_tick; /* save tick when we left */
logf("done");
} /* pcmrec_flush */
/**
* Marks a new stream in the buffer and gives the encoder a chance for special
* handling of transition from one to the next. The encoder may change the
* chunk that ends the old stream by requesting more chunks and similiarly for
* the new but must always advance the position though the interface. It can
* later reject any data it cares to when writing the file but should mark the
* chunk so it can recognize this. ENC_WRITE_CHUNK event must be able to accept
* a NULL data pointer without error as well.
*/
static void pcmrec_new_stream(const char *filename, /* next file name */
unsigned long flags, /* CHUNKF_* flags */
int pre_index) /* index for prerecorded data */
{
logf("pcmrec_new_stream");
struct enc_buffer_event_data data;
bool (*fnq_add_fn)(const char *) = NULL;
struct enc_chunk_hdr *start = NULL;
int get_chunk_index(struct enc_chunk_hdr *chunk)
{
return ((char *)chunk - (char *)enc_buffer) / enc_chunk_size;
}
struct enc_chunk_hdr * get_prev_chunk(int index)
{
#ifdef PCMREC_PARANOID
int index_last = index;
#endif
DEC_ENC_INDEX(index);
return GET_ENC_CHUNK(index);
}
data.pre_chunk = NULL;
data.chunk = GET_ENC_CHUNK(enc_wr_index);
/* end chunk */
if (flags & CHUNKF_END_FILE)
{
data.chunk->flags &= CHUNKF_START_FILE | CHUNKF_END_FILE;
if (data.chunk->flags & CHUNKF_START_FILE)
{
/* cannot start and end on same unprocessed chunk */
logf("file end on start");
flags &= ~CHUNKF_END_FILE;
}
else if (enc_rd_index == enc_wr_index)
{
/* all data flushed but file not ended - chunk will be left
empty */
logf("end on dead end");
data.chunk->flags = 0;
data.chunk->enc_size = 0;
data.chunk->num_pcm = 0;
data.chunk->enc_data = NULL;
INC_ENC_INDEX(enc_wr_index);
data.chunk = GET_ENC_CHUNK(enc_wr_index);
}
else
{
struct enc_chunk_hdr *last = get_prev_chunk(enc_wr_index);
if (last->flags & CHUNKF_END_FILE)
{
/* end already processed and marked - can't end twice */
logf("file end again");
flags &= ~CHUNKF_END_FILE;
}
}
}
/* start chunk */
if (flags & CHUNKF_START_FILE)
{
bool pre = flags & CHUNKF_PRERECORD;
if (pre)
{
logf("stream prerecord start");
start = data.pre_chunk = GET_ENC_CHUNK(pre_index);
start->flags &= CHUNKF_START_FILE | CHUNKF_PRERECORD;
}
else
{
logf("stream normal start");
start = data.chunk;
start->flags &= CHUNKF_START_FILE;
}
/* if encoder hasn't yet processed the last start - abort the start
of the previous file queued or else it will be empty and invalid */
if (start->flags & CHUNKF_START_FILE)
{
logf("replacing fnq tail: %s", filename);
fnq_add_fn = pcmrec_fnq_replace_tail;
}
else
{
logf("adding filename: %s", filename);
fnq_add_fn = pcmrec_fnq_add_filename;
}
}
data.flags = flags;
enc_events_callback(ENC_REC_NEW_STREAM, &data);
if (flags & CHUNKF_END_FILE)
{
int i = get_chunk_index(data.chunk);
get_prev_chunk(i)->flags |= CHUNKF_END_FILE;
}
if (start)
{
char buf[MAX_PATH]; /* place to copy in case we're full */
if (!(flags & CHUNKF_PRERECORD))
{
/* get stats on data added to start - sort of a prerecord operation */
int i = get_chunk_index(data.chunk);
#ifdef PCMREC_PARANOID
int i_last = i;
#endif
struct enc_chunk_hdr *chunk = data.chunk;
logf("start data: %d %d", i, enc_wr_index);
num_rec_bytes = 0;
num_rec_samples = 0;
while (i != enc_wr_index)
{
num_rec_bytes += chunk->enc_size;
num_rec_samples += chunk->num_pcm;
INC_ENC_INDEX(i);
chunk = GET_ENC_CHUNK(i);
}
start->flags &= ~CHUNKF_START_FILE;
start = data.chunk;
}
start->flags |= CHUNKF_START_FILE;
/* flush all pending files out if full and adding */
if (fnq_add_fn == pcmrec_fnq_add_filename && pcmrec_fnq_is_full())
{
logf("fnq full");
/* make a local copy of filename and let sender go as this
flush will hang the screen for a bit otherwise */
strncpy(buf, filename, MAX_PATH);
filename = buf;
queue_reply(&pcmrec_queue, NULL);
pcmrec_flush(-1);
}
fnq_add_fn(filename);
}
} /* pcmrec_new_stream */
/** event handlers for pcmrec thread */
/* PCMREC_INIT */
static void pcmrec_init(void)
{
unsigned char *buffer;
rec_fdata.rec_file = -1;
/* warings and errors */
warnings =
errors = 0;
/* pcm FIFO */
dma_lock = true;
SET_PCM_POS(pcm_rd_pos, 0);
SET_PCM_POS(dma_wr_pos, 0);
/* encoder FIFO */
SET_ENC_INDEX(enc_wr_index, 0);
SET_ENC_INDEX(enc_rd_index, 0);
/* filename queue */
fnq_rd_pos = 0;
fnq_wr_pos = 0;
/* stats */
num_rec_bytes = 0;
num_rec_samples = 0;
#if 0
accum_rec_bytes = 0;
accum_pcm_samples = 0;
#endif
pre_record_ticks = 0;
is_recording = false;
is_paused = false;
buffer = audio_get_recording_buffer(&rec_buffer_size);
/* Line align pcm_buffer 2^4=16 bytes */
pcm_buffer = (unsigned char *)ALIGN_UP_P2((unsigned long)buffer, 4);
enc_buffer = pcm_buffer + ALIGN_UP_P2(PCM_NUM_CHUNKS*PCM_CHUNK_SIZE +
PCM_MAX_FEED_SIZE, 2);
/* Adjust available buffer for possible align advancement */
rec_buffer_size -= pcm_buffer - buffer;
pcm_init_recording();
} /* pcmrec_init */
/* PCMREC_CLOSE */
static void pcmrec_close(void)
{
dma_lock = true;
pre_record_ticks = 0; /* Can't be prerecording any more */
warnings = 0;
pcm_close_recording();
reset_hardware();
audio_remove_encoder();
} /* pcmrec_close */
/* PCMREC_OPTIONS */
static void pcmrec_set_recording_options(struct audio_recording_options *options)
{
/* stop DMA transfer */
dma_lock = true;
pcm_stop_recording();
rec_frequency = options->rec_frequency;
rec_source = options->rec_source;
num_channels = options->rec_channels == 1 ? 1 : 2;
pre_record_ticks = options->rec_prerecord_time * HZ;
enc_config = options->enc_config;
enc_config.afmt = rec_format_afmt[enc_config.rec_format];
#ifdef HAVE_SPDIF_IN
if (rec_source == AUDIO_SRC_SPDIF)
{
/* must measure SPDIF sample rate before configuring codecs */
unsigned long sr = spdif_measure_frequency();
/* round to master list for SPDIF rate */
int index = round_value_to_list32(sr, audio_master_sampr_list,
SAMPR_NUM_FREQ, false);
sample_rate = audio_master_sampr_list[index];
/* round to HW playback rates for monitoring */
index = round_value_to_list32(sr, hw_freq_sampr,
HW_NUM_FREQ, false);
pcm_set_frequency(hw_freq_sampr[index]);
/* encoders with a limited number of rates do their own rounding */
}
else
#endif
{
/* set sample rate from frequency selection */
sample_rate = rec_freq_sampr[rec_frequency];
pcm_set_frequency(sample_rate);
}
/* set monitoring */
audio_set_output_source(rec_source);
/* apply pcm settings to hardware */
pcm_apply_settings(true);
queue_reply(&pcmrec_queue, NULL); /* Release sender */
if (audio_load_encoder(enc_config.afmt))
{
/* start DMA transfer */
dma_lock = pre_record_ticks == 0;
pcm_record_data(pcm_rec_have_more, GET_PCM_CHUNK(dma_wr_pos),
PCM_CHUNK_SIZE);
}
else
{
logf("set rec opt: enc load failed");
errors |= PCMREC_E_LOAD_ENCODER;
}
} /* pcmrec_set_recording_options */
/* PCMREC_RECORD - start recording (not gapless)
or split stream (gapless) */
static void pcmrec_record(const char *filename)
{
unsigned long pre_sample_ticks;
int rd_start;
logf("pcmrec_record: %s", filename);
/* reset stats */
num_rec_bytes = 0;
num_rec_samples = 0;
if (is_recording)
{
/* already recording, just split the stream */
logf("inserting split");
pcmrec_new_stream(filename,
CHUNKF_START_FILE | CHUNKF_END_FILE,
0);
goto record_done;
}
#if 0
accum_rec_bytes = 0;
accum_pcm_samples = 0;
#endif
spinup_time = -1;
warnings = 0; /* reset warnings */
rd_start = enc_wr_index;
pre_sample_ticks = 0;
if (pre_record_ticks)
{
int i = rd_start;
#ifdef PCMREC_PARANOID
int i_last = i;
#endif
/* calculate number of available chunks */
unsigned long avail_pre_chunks = (enc_wr_index - enc_rd_index +
enc_num_chunks) % enc_num_chunks;
/* overflow at 974 seconds of prerecording at 44.1kHz */
unsigned long pre_record_sample_ticks = enc_sample_rate*pre_record_ticks;
/* Get exact measure of recorded data as number of samples aren't
nescessarily going to be the max for each chunk */
for (; avail_pre_chunks-- > 0;)
{
struct enc_chunk_hdr *chunk;
unsigned long chunk_sample_ticks;
DEC_ENC_INDEX(i);
chunk = GET_ENC_CHUNK(i);
/* must have data to be counted */
if (chunk->enc_data == NULL)
continue;
chunk_sample_ticks = chunk->num_pcm*HZ;
rd_start = i;
pre_sample_ticks += chunk_sample_ticks;
num_rec_bytes += chunk->enc_size;
num_rec_samples += chunk->num_pcm;
/* stop here if enough already */
if (pre_sample_ticks >= pre_record_sample_ticks)
break;
}
#if 0
accum_rec_bytes = num_rec_bytes;
accum_pcm_samples = num_rec_samples;
#endif
}
SET_ENC_INDEX(enc_rd_index, rd_start);
/* filename queue should be empty */
if (!pcmrec_fnq_is_empty())
{
logf("fnq: not empty!");
pcmrec_fnq_set_empty();
}
dma_lock = false;
is_paused = false;
is_recording = true;
pcmrec_new_stream(filename,
CHUNKF_START_FILE |
(pre_sample_ticks > 0 ? CHUNKF_PRERECORD : 0),
enc_rd_index);
record_done:
logf("pcmrec_record done");
} /* pcmrec_record */
/* PCMREC_STOP */
static void pcmrec_stop(void)
{
logf("pcmrec_stop");
if (!is_recording)
{
logf("not recording");
goto not_recording;
}
dma_lock = true; /* lock dma write position */
queue_reply(&pcmrec_queue, NULL);
/* flush all available data first to avoid overflow while waiting
for encoding to finish */
pcmrec_flush(-1);
/* wait for encoder to finish remaining data */
while (errors == 0 && !wav_queue_empty)
yield();
/* end stream at last data */
pcmrec_new_stream(NULL, CHUNKF_END_FILE, 0);
/* flush anything else encoder added */
pcmrec_flush(-1);
/* remove any pending file start not yet processed - should be at
most one at enc_wr_index */
pcmrec_fnq_get_filename(NULL);
/* encoder should abort any chunk it was in midst of processing */
GET_ENC_CHUNK(enc_wr_index)->flags = CHUNKF_ABORT;
/* filename queue should be empty */
if (!pcmrec_fnq_is_empty())
{
logf("fnq: not empty!");
pcmrec_fnq_set_empty();
}
/* be absolutely sure the file is closed */
if (errors != 0)
pcmrec_close_file(&rec_fdata.rec_file);
rec_fdata.rec_file = -1;
is_recording = false;
is_paused = false;
dma_lock = pre_record_ticks == 0;
not_recording:
logf("pcmrec_stop done");
} /* pcmrec_stop */
/* PCMREC_PAUSE */
static void pcmrec_pause(void)
{
logf("pcmrec_pause");
if (!is_recording)
{
logf("not recording");
goto not_recording_or_paused;
}
else if (is_paused)
{
logf("already paused");
goto not_recording_or_paused;
}
dma_lock = true; /* fix DMA write pointer at current position */
is_paused = true;
not_recording_or_paused:
logf("pcmrec_pause done");
} /* pcmrec_pause */
/* PCMREC_RESUME */
static void pcmrec_resume(void)
{
logf("pcmrec_resume");
if (!is_recording)
{
logf("not recording");
goto not_recording_or_not_paused;
}
else if (!is_paused)
{
logf("not paused");
goto not_recording_or_not_paused;
}
is_paused = false;
is_recording = true;
dma_lock = false;
not_recording_or_not_paused:
logf("pcmrec_resume done");
} /* pcmrec_resume */
static void pcmrec_thread(void) __attribute__((noreturn));
static void pcmrec_thread(void)
{
struct event ev;
logf("thread pcmrec start");
while(1)
{
if (is_recording)
{
/* Poll periodically to flush data */
queue_wait_w_tmo(&pcmrec_queue, &ev, HZ/5);
if (ev.id == SYS_TIMEOUT)
{
pcmrec_flush(0); /* flush if getting full */
continue;
}
}
else
{
/* Not doing anything - sit and wait for commands */
queue_wait(&pcmrec_queue, &ev);
}
switch (ev.id)
{
case PCMREC_INIT:
pcmrec_init();
break;
case PCMREC_CLOSE:
pcmrec_close();
break;
case PCMREC_OPTIONS:
pcmrec_set_recording_options(
(struct audio_recording_options *)ev.data);
break;
case PCMREC_RECORD:
pcmrec_record((const char *)ev.data);
break;
case PCMREC_STOP:
pcmrec_stop();
break;
case PCMREC_PAUSE:
pcmrec_pause();
break;
case PCMREC_RESUME:
pcmrec_resume();
break;
#if 0
case PCMREC_FLUSH_NUM:
pcmrec_flush((unsigned)ev.data);
break;
#endif
case SYS_USB_CONNECTED:
if (is_recording)
break;
pcmrec_close();
reset_hardware();
usb_acknowledge(SYS_USB_CONNECTED_ACK);
usb_wait_for_disconnect(&pcmrec_queue);
break;
} /* end switch */
queue_reply(&pcmrec_queue, NULL);
} /* end while */
} /* pcmrec_thread */
/****************************************************************************/
/* */
/* following functions will be called by the encoder codec */
/* */
/****************************************************************************/
/* pass the encoder settings to the encoder */
void enc_get_inputs(struct enc_inputs *inputs)
{
inputs->sample_rate = sample_rate;
inputs->num_channels = num_channels;
inputs->config = &enc_config;
} /* enc_get_inputs */
/* set the encoder dimensions (called by encoder codec at initialization and
termination) */
void enc_set_parameters(struct enc_parameters *params)
{
size_t bufsize, resbytes;
logf("enc_set_parameters");
if (!params)
{
logf("reset");
/* Encoder is terminating */
memset(&enc_config, 0, sizeof (enc_config));
enc_sample_rate = 0;
return;
}
enc_sample_rate = params->enc_sample_rate;
logf("enc sampr:%d", enc_sample_rate);
SET_PCM_POS(pcm_rd_pos, dma_wr_pos);
enc_config.afmt = params->afmt;
/* addition of the header is always implied - chunk size 4-byte aligned */
enc_chunk_size =
ALIGN_UP_P2(ENC_CHUNK_HDR_SIZE + params->chunk_size, 2);
enc_events_callback = params->events_callback;
logf("chunk size:%d", enc_chunk_size);
/*** Configure the buffers ***/
/* Layout of recording buffer:
* [ax] = possible alignment x multiple
* [sx] = possible size alignment of x multiple
* |[a16]|[s4]:PCM Buffer+PCM Guard|[s4 each]:Encoder Chunks|->
* |[[s4]:Reserved Bytes]|Filename Queue->|[space]|
*/
resbytes = ALIGN_UP_P2(params->reserve_bytes, 2);
logf("resbytes:%d", resbytes);
bufsize = rec_buffer_size - (enc_buffer - pcm_buffer) -
resbytes - FNQ_MIN_NUM_PATHS*MAX_PATH
#ifdef PCMREC_PARANOID
- sizeof (*wrap_id_p)
#endif
;
enc_num_chunks = bufsize / enc_chunk_size;
logf("num chunks:%d", enc_num_chunks);
/* get real amount used by encoder chunks */
bufsize = enc_num_chunks*enc_chunk_size;
logf("enc size:%d", bufsize);
#ifdef PCMREC_PARANOID
/* add magic at wraparound */
wrap_id_p = SKIPBYTES((unsigned long *)enc_buffer, bufsize);
bufsize += sizeof (*wrap_id_p);
*wrap_id_p = ENC_CHUNK_MAGIC;
#endif /* PCMREC_PARANOID */
/* panic boost thread priority at 1 second remaining */
panic_threshold = enc_num_chunks -
(4*sample_rate + (enc_chunk_size-1)) / enc_chunk_size;
if (panic_threshold < 0)
panic_threshold = 0;
logf("panic thr:%d", panic_threshold);
/** set OUT parameters **/
params->enc_buffer = enc_buffer;
params->buf_chunk_size = enc_chunk_size;
params->num_chunks = enc_num_chunks;
/* calculate reserve buffer start and return pointer to encoder */
params->reserve_buffer = NULL;
if (resbytes > 0)
{
params->reserve_buffer = enc_buffer + bufsize;
bufsize += resbytes;
}
/* place filename queue at end of buffer using up whatever remains */
fnq_rd_pos = 0; /* reset */
fnq_wr_pos = 0; /* reset */
fn_queue = enc_buffer + bufsize;
fnq_size = pcm_buffer + rec_buffer_size - fn_queue;
fnq_size = ALIGN_DOWN(fnq_size, MAX_PATH);
logf("fnq files: %d", fnq_size / MAX_PATH);
#if 0
logf("ab :%08X", (unsigned long)audiobuf);
logf("pcm:%08X", (unsigned long)pcm_buffer);
logf("enc:%08X", (unsigned long)enc_buffer);
logf("res:%08X", (unsigned long)params->reserve_buffer);
#ifdef PCMREC_PARANOID
logf("wip:%08X", (unsigned long)wrap_id_p);
#endif
logf("fnq:%08X", (unsigned long)fn_queue);
logf("end:%08X", (unsigned long)fn_queue + fnq_size);
logf("abe:%08X", (unsigned long)audiobufend);
#endif
/* init all chunk headers and reset indexes */
SET_ENC_INDEX(enc_rd_index, 0);
for (enc_wr_index = enc_num_chunks; enc_wr_index > 0; )
{
struct enc_chunk_hdr *chunk = GET_ENC_CHUNK(--enc_wr_index);
#ifdef PCMREC_PARANOID
chunk->id = ENC_CHUNK_MAGIC;
#endif
chunk->flags = 0;
}
logf("enc_set_parameters done");
} /* enc_set_parameters */
/* return encoder chunk at current write position */
struct enc_chunk_hdr * enc_get_chunk(void)
{
struct enc_chunk_hdr *chunk = GET_ENC_CHUNK(enc_wr_index);
#ifdef PCMREC_PARANOID
if (chunk->id != ENC_CHUNK_MAGIC || *wrap_id_p != ENC_CHUNK_MAGIC)
{
errors |= PCMREC_E_CHUNK_OVF;
logf("finish chk ovf: %d", enc_wr_index);
}
#endif
chunk->flags &= CHUNKF_START_FILE;
if (!is_recording)
chunk->flags |= CHUNKF_PRERECORD;
return chunk;
} /* enc_get_chunk */
/* releases the current chunk into the available chunks */
void enc_finish_chunk(void)
{
struct enc_chunk_hdr *chunk = GET_ENC_CHUNK(enc_wr_index);
if ((long)chunk->flags < 0)
{
/* encoder set error flag */
errors |= PCMREC_E_ENCODER;
logf("finish chk enc error");
}
PARANOID_CHUNK_CHECK(chunk);
/* advance enc_wr_index to the next encoder chunk */
INC_ENC_INDEX(enc_wr_index);
if (enc_rd_index != enc_wr_index)
{
num_rec_bytes += chunk->enc_size;
num_rec_samples += chunk->num_pcm;
#if 0
accum_rec_bytes += chunk->enc_size;
accum_pcm_samples += chunk->num_pcm;
#endif
}
else if (is_recording) /* buffer full */
{
/* keep current position - but put up warning flag */
warnings |= PCMREC_W_ENC_BUFFER_OVF;
logf("enc_buffer ovf");
DEC_ENC_INDEX(enc_wr_index);
}
else
{
/* advance enc_rd_index for prerecording */
INC_ENC_INDEX(enc_rd_index);
}
} /* enc_finish_chunk */
/* checks near empty state on pcm input buffer */
int enc_pcm_buf_near_empty(void)
{
/* less than 1sec raw data? => unboost encoder */
int wp = dma_wr_pos;
size_t avail = (wp - pcm_rd_pos) & PCM_CHUNK_MASK;
return avail < (sample_rate << 2) ? 1 : 0;
} /* enc_pcm_buf_near_empty */
/* passes a pointer to next chunk of unprocessed wav data */
/* TODO: this really should give the actual size returned */
unsigned char * enc_get_pcm_data(size_t size)
{
int wp = dma_wr_pos;
size_t avail = (wp - pcm_rd_pos) & PCM_CHUNK_MASK;
/* limit the requested pcm data size */
if (size > PCM_MAX_FEED_SIZE)
size = PCM_MAX_FEED_SIZE;
if (avail >= size)
{
unsigned char *ptr = pcm_buffer + pcm_rd_pos;
int next_pos = (pcm_rd_pos + size) & PCM_CHUNK_MASK;
SET_PCM_POS(pcm_rd_pos, next_pos);
pcm_rd_pos = next_pos;
/* ptr must point to continous data at wraparound position */
if ((size_t)pcm_rd_pos < size)
memcpy(pcm_buffer + PCM_NUM_CHUNKS*PCM_CHUNK_SIZE,
pcm_buffer, pcm_rd_pos);
wav_queue_empty = false;
return ptr;
}
/* not enough data available - encoder should idle */
wav_queue_empty = true;
return NULL;
} /* enc_get_pcm_data */
/* puts some pcm data back in the queue */
size_t enc_unget_pcm_data(size_t size)
{
/* can't let DMA advance write position when doing this */
int level = set_irq_level(HIGHEST_IRQ_LEVEL);
if (pcm_rd_pos != dma_wr_pos)
{
/* disallow backing up into current DMA write chunk */
size_t old_avail = (pcm_rd_pos - dma_wr_pos - PCM_CHUNK_SIZE)
& PCM_CHUNK_MASK;
int next_pos;
/* limit size to amount of old data remaining */
if (size > old_avail)
size = old_avail;
next_pos = (pcm_rd_pos - size) & PCM_CHUNK_MASK;
SET_PCM_POS(pcm_rd_pos, next_pos);
}
set_irq_level(level);
return size;
} /* enc_unget_pcm_data */
/** Low level pcm recording apis **/
/****************************************************************************
* Functions that do not require targeted implementation but only a targeted
* interface
*/
void pcm_record_data(pcm_more_callback_type2 more_ready,
void *start, size_t size)
{
if (!(start && size))
return;
pcm_callback_more_ready = more_ready;
pcm_rec_dma_start(start, size);
} /* pcm_record_data */
void pcm_stop_recording(void)
{
if (pcm_recording)
pcm_rec_dma_stop();
} /* pcm_stop_recording */
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