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rockbox/firmware/pcm_record.c
Daniel Stenberg 2acc0ac542 Updated our source code header to explicitly mention that we are GPL v2 or 
later. We still need to hunt down snippets used that are not. 1324 modified
files...
http://www.rockbox.org/mail/archive/rockbox-dev-archive-2008-06/0060.shtml


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17847 a1c6a512-1295-4272-9138-f99709370657
2008-06-28 18:10:04 +00:00

1784 lines
54 KiB
C
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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2005 by Linus Nielsen Feltzing
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* 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
/***************************************************************************/
extern struct thread_entry *codec_thread_p;
/** 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 */
static int flush_interrupts = 0; /* Number of messages queued that
should interrupt a flush in
progress -
for a safety net and a prompt
response to stop, split and pause
requests -
only interrupts a flush initiated
by pcmrec_flush(0) */
/* Utility functions for setting/clearing flushing interrupt flag */
static inline void flush_interrupt(void)
{
flush_interrupts++;
logf("flush int: %d", flush_interrupts);
}
static inline void clear_flush_interrupt(void)
{
if (--flush_interrupts < 0)
flush_interrupts = 0;
}
/** 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_get_chunk(); get a ptr to next enc chunk
7.encoder: <process enc chunk> compress and store data to enc chunk
8.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
9.encoder: repeat 4. to 8.
A.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))
#define INC_ENC_INDEX(index) \
{ if (++index >= enc_num_chunks) index = 0; }
#define DEC_ENC_INDEX(index) \
{ if (--index < 0) index = enc_num_chunks - 1; }
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 */
#ifdef DEBUG
static unsigned long *wrap_id_p; /* magic at wrap position - a debugging
aid to check if the encoder data
spilled out of its chunk */
#endif /* DEBUG */
static volatile int dma_wr_pos; /* current DMA write pos */
static int pcm_rd_pos; /* current PCM read pos */
static int pcm_enc_pos; /* position encoder is processing */
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 pcmrec_context = false; /* called by pcmrec thread? */
static bool pcm_buffer_empty; /* all pcm chunks processed? */
/** file flushing **/
static int low_watermark; /* Low watermark to stop flush */
static int high_watermark; /* max chunk limit for data flush */
static unsigned long spinup_time = 35*HZ/10; /* Fudged spinup time */
static int last_ata_spinup_time = -1;/* previous spin time used */
#ifdef HAVE_PRIORITY_SCHEDULING
static int flood_watermark; /* boost thread priority when here */
#endif
/* Constants that control watermarks */
#define LOW_SECONDS 1 /* low watermark time till empty */
#define MINI_CHUNKS 10 /* chunk count for mini flush */
#ifdef HAVE_PRIORITY_SCHEDULING
#define PRIO_SECONDS 10 /* max flush time before priority boost */
#endif
#if MEM <= 16
#define PANIC_SECONDS 5 /* flood watermark time until full */
#define FLUSH_SECONDS 7 /* flush watermark time until full */
#else
#define PANIC_SECONDS 8
#define FLUSH_SECONDS 10
#endif /* MEM */
/** 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 */
#define FNQ_MAX_NUM_PATHS 64 /* maximum 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 */
#define FNQ_NEXT(pos) \
({ int p = (pos) + MAX_PATH; \
if (p >= fnq_size) \
p = 0; \
p; })
#define FNQ_PREV(pos) \
({ int p = (pos) - MAX_PATH; \
if (p < 0) \
p = fnq_size - MAX_PATH; \
p; })
enum
{
PCMREC_FLUSH_INTERRUPTABLE = 0x8000000, /* Flush can be interrupted by
incoming messages - combine
with other constants */
PCMREC_FLUSH_ALL = 0x7ffffff, /* Flush all files */
PCMREC_FLUSH_MINI = 0x7fffffe, /* Flush a small number of
chunks */
PCMREC_FLUSH_IF_HIGH = 0x0000000, /* Flush if high watermark
reached */
};
/***************************************************************************/
static struct event_queue pcmrec_queue SHAREDBSS_ATTR;
static struct queue_sender_list pcmrec_queue_send SHAREDBSS_ATTR;
static long pcmrec_stack[3*DEFAULT_STACK_SIZE/sizeof(long)];
static const char pcmrec_thread_name[] = "pcmrec";
static struct thread_entry *pcmrec_thread_p;
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, 0);
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 processing start position is inside current
write chunk */
if ((unsigned)(pcm_enc_pos - next_pos) < PCM_CHUNK_SIZE)
warnings |= PCMREC_W_PCM_BUFFER_OVF;
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();
}
/** 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);
pcmrec_thread_p =
create_thread(pcmrec_thread, pcmrec_stack, sizeof(pcmrec_stack),
0, pcmrec_thread_name IF_PRIO(, PRIORITY_RECORDING)
IF_COP(, CPU));
queue_enable_queue_send(&pcmrec_queue, &pcmrec_queue_send,
pcmrec_thread_p);
} /* pcm_rec_init */
/** audio_* group **/
/**
* 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, 0);
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, 0);
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, (intptr_t)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);
flush_interrupt();
queue_send(&pcmrec_queue, PCMREC_RECORD, (intptr_t)filename);
logf("audio_record_done");
} /* audio_record */
/**
* audio_record wrapper for API compatibility with HW codec
*/
void audio_new_file(const char *filename)
{
audio_record(filename);
} /* audio_new_file */
/**
* Stop current recording if recording
*/
void audio_stop_recording(void)
{
logf("audio_stop_recording");
flush_interrupt();
queue_post(&pcmrec_queue, PCMREC_STOP, 0);
logf("audio_stop_recording done");
} /* audio_stop_recording */
/**
* Pause current recording
*/
void audio_pause_recording(void)
{
logf("audio_pause_recording");
flush_interrupt();
queue_post(&pcmrec_queue, PCMREC_PAUSE, 0);
logf("audio_pause_recording done");
} /* audio_pause_recording */
/**
* Resume current recording if paused
*/
void audio_resume_recording(void)
{
logf("audio_resume_recording");
queue_post(&pcmrec_queue, PCMREC_RESUME, 0);
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 */
/***************************************************************************/
/* */
/* 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);
fnq_wr_pos = FNQ_NEXT(fnq_wr_pos);
if (fnq_rd_pos != fnq_wr_pos)
return true;
/* queue full */
fnq_rd_pos = FNQ_NEXT(fnq_rd_pos);
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_PREV(fnq_wr_pos);
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);
fnq_rd_pos = FNQ_NEXT(fnq_rd_pos);
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 */
if (close(*fd_p) != 0)
errors |= PCMREC_E_IO;
*fd_p = -1;
} /* pcmrec_close_file */
/** 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 %lu %lu",
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 */
/**
* Update buffer watermarks with spinup time compensation
*
* All this assumes reasonable data rates, chunk sizes and sufficient
* memory for the most part. Some dumb checks are included but perhaps
* are pointless since this all will break down at extreme limits that
* are currently not applicable to any supported device.
*/
static void pcmrec_refresh_watermarks(void)
{
logf("ata spinup: %d", ata_spinup_time);
/* set the low mark for when flushing stops if automatic */
low_watermark = (LOW_SECONDS*4*sample_rate + (enc_chunk_size-1))
/ enc_chunk_size;
logf("low wmk: %d", low_watermark);
#ifdef HAVE_PRIORITY_SCHEDULING
/* panic boost thread priority if 2 seconds of ground is lost -
this allows encoder to boost with just under a second of
pcm data (if not yet full enough to boost itself)
and not falsely trip the alarm. */
flood_watermark = enc_num_chunks -
(PANIC_SECONDS*4*sample_rate + (enc_chunk_size-1))
/ enc_chunk_size;
if (flood_watermark < low_watermark)
{
logf("warning: panic < low");
flood_watermark = low_watermark;
}
logf("flood at: %d", flood_watermark);
#endif
spinup_time = last_ata_spinup_time = ata_spinup_time;
/* write at 8s + st remaining in enc_buffer - range 12s to
20s total - default to 3.5s spinup. */
if (spinup_time == 0)
spinup_time = 35*HZ/10; /* default - cozy */
else if (spinup_time < 2*HZ)
spinup_time = 2*HZ; /* ludicrous - ramdisk? */
else if (spinup_time > 10*HZ)
spinup_time = 10*HZ; /* do you have a functioning HD? */
/* try to start writing with 10s remaining after disk spinup */
high_watermark = enc_num_chunks -
((FLUSH_SECONDS*HZ + spinup_time)*4*sample_rate +
(enc_chunk_size-1)*HZ) / (enc_chunk_size*HZ);
if (high_watermark < low_watermark)
{
high_watermark = low_watermark;
low_watermark /= 2;
logf("warning: low 'write at'");
}
logf("write at: %d", high_watermark);
} /* pcmrec_refresh_watermarks */
/**
* 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 or to
* a PCMREC_FLUSH_* constant.
*/
static void pcmrec_flush(unsigned flush_num)
{
#ifdef HAVE_PRIORITY_SCHEDULING
static unsigned long last_flush_tick; /* tick when function returned */
unsigned long start_tick; /* When flush started */
unsigned long prio_tick; /* Timeout for auto boost */
int prio_pcmrec; /* Current thread priority for pcmrec */
int prio_codec; /* Current thread priority for codec */
#endif
int num_ready; /* Number of chunks ready at start */
unsigned remaining; /* Number of file starts remaining */
unsigned chunks_flushed; /* Chunks flushed (for mini flush only) */
bool interruptable; /* Flush can be interupted */
num_ready = enc_wr_index - enc_rd_index;
if (num_ready < 0)
num_ready += enc_num_chunks;
/* save interruptable flag and remove it to get the actual count */
interruptable = (flush_num & PCMREC_FLUSH_INTERRUPTABLE) != 0;
flush_num &= ~PCMREC_FLUSH_INTERRUPTABLE;
if (flush_num == 0)
{
if (!is_recording)
return;
if (ata_spinup_time != last_ata_spinup_time)
pcmrec_refresh_watermarks();
/* enough available? no? then leave */
if (num_ready < high_watermark)
return;
} /* endif (flush_num == 0) */
#ifdef HAVE_PRIORITY_SCHEDULING
start_tick = current_tick;
prio_tick = start_tick + PRIO_SECONDS*HZ + spinup_time;
if (flush_num == 0 && TIME_BEFORE(current_tick, last_flush_tick + HZ/2))
{
/* if we're getting called too much and this isn't forced,
boost stat by expiring timeout in advance */
logf("too frequent flush");
prio_tick = current_tick - 1;
}
prio_pcmrec = -1;
prio_codec = -1; /* GCC is too stoopid to figure out it doesn't
need init */
#endif
logf("writing:%d(%d):%s%s", num_ready, flush_num,
interruptable ? "i" : "",
flush_num == PCMREC_FLUSH_MINI ? "m" : "");
cpu_boost(true);
remaining = flush_num;
chunks_flushed = 0;
while (num_ready > 0)
{
/* check current number of encoder chunks */
int num = enc_wr_index - enc_rd_index;
if (num < 0)
num += enc_num_chunks;
if (num <= low_watermark &&
(flush_num == PCMREC_FLUSH_IF_HIGH || num <= 0))
{
logf("low data: %d", num);
break; /* data remaining is below threshold */
}
if (interruptable && flush_interrupts > 0)
{
logf("int at: %d", num);
break; /* interrupted */
}
#ifdef HAVE_PRIORITY_SCHEDULING
if (prio_pcmrec == -1 && (num >= flood_watermark ||
TIME_AFTER(current_tick, prio_tick)))
{
/* losing ground or holding without progress - boost
priority until finished */
logf("pcmrec: boost (%s)",
num >= flood_watermark ? "num" : "time");
prio_pcmrec = thread_set_priority(NULL,
thread_get_priority(NULL) - 4);
prio_codec = thread_set_priority(codec_thread_p,
thread_get_priority(codec_thread_p) - 4);
}
#endif
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;
if (rec_fdata.chunk->flags & CHUNKF_START_FILE)
{
pcmrec_start_file();
if (--remaining == 0)
num_ready = 0; /* 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)
{
pcmrec_end_file();
break;
}
if (flush_num == PCMREC_FLUSH_MINI &&
++chunks_flushed >= MINI_CHUNKS)
{
logf("mini flush break");
break;
}
/* no yielding; the file apis called in the codecs do that
sufficiently */
} /* end while */
/* sync file */
if (rec_fdata.rec_file >= 0 && fsync(rec_fdata.rec_file) != 0)
errors |= PCMREC_E_IO;
cpu_boost(false);
#ifdef HAVE_PRIORITY_SCHEDULING
if (prio_pcmrec != -1)
{
/* return to original priorities */
logf("pcmrec: unboost priority");
thread_set_priority(NULL, prio_pcmrec);
thread_set_priority(codec_thread_p, prio_codec);
}
last_flush_tick = current_tick; /* save tick when we left */
#endif
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 int pcmrec_get_chunk_index(struct enc_chunk_hdr *chunk)
{
return ((char *)chunk - (char *)enc_buffer) / enc_chunk_size;
} /* pcmrec_get_chunk_index */
static struct enc_chunk_hdr * pcmrec_get_prev_chunk(int index)
{
DEC_ENC_INDEX(index);
return GET_ENC_CHUNK(index);
} /* pcmrec_get_prev_chunk */
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");
char path[MAX_PATH]; /* place to copy filename so sender can be released */
struct enc_buffer_event_data data;
bool (*fnq_add_fn)(const char *) = NULL; /* function to use to add
new filename */
struct enc_chunk_hdr *start = NULL; /* pointer to starting chunk of
stream */
bool did_flush = false; /* did a flush occurr? */
if (filename)
strncpy(path, filename, MAX_PATH);
queue_reply(&pcmrec_queue, 0); /* We have all we need */
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 = pcmrec_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;
pcmrec_context = true; /* switch encoder context */
enc_events_callback(ENC_REC_NEW_STREAM, &data);
pcmrec_context = false; /* switch back */
if (flags & CHUNKF_END_FILE)
{
int i = pcmrec_get_chunk_index(data.chunk);
pcmrec_get_prev_chunk(i)->flags |= CHUNKF_END_FILE;
}
if (start)
{
if (!(flags & CHUNKF_PRERECORD))
{
/* get stats on data added to start - sort of a prerecord
operation */
int i = pcmrec_get_chunk_index(data.chunk);
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");
pcmrec_flush(PCMREC_FLUSH_ALL);
did_flush = true;
}
fnq_add_fn(path);
}
/* Make sure to complete any interrupted high watermark */
if (!did_flush)
pcmrec_flush(PCMREC_FLUSH_IF_HIGH);
} /* pcmrec_new_stream */
/** event handlers for pcmrec thread */
/* PCMREC_INIT */
static void pcmrec_init(void)
{
unsigned char *buffer;
/* warings and errors */
warnings =
errors = 0;
pcmrec_close_file(&rec_fdata.rec_file);
rec_fdata.rec_file = -1;
/* pcm FIFO */
dma_lock = true;
pcm_rd_pos = 0;
dma_wr_pos = 0;
pcm_enc_pos = 0;
/* encoder FIFO */
enc_wr_index = 0;
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((uintptr_t)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 hardware setting to start monitoring now */
pcm_apply_settings();
queue_reply(&pcmrec_queue, 0); /* 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;
unsigned long flags;
int pre_index;
logf("pcmrec_record: %s", filename);
/* reset stats */
num_rec_bytes = 0;
num_rec_samples = 0;
if (!is_recording)
{
#if 0
accum_rec_bytes = 0;
accum_pcm_samples = 0;
#endif
warnings = 0; /* reset warnings */
rd_start = enc_wr_index;
pre_sample_ticks = 0;
pcmrec_refresh_watermarks();
if (pre_record_ticks)
{
int i = rd_start;
/* 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;
int pre_chunks = 0; /* Counter to limit prerecorded time to
prevent flood state at outset */
logf("pre-st: %ld", pre_record_sample_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;
pre_chunks++;
/* stop here if enough already */
if (pre_chunks >= high_watermark ||
pre_sample_ticks >= pre_record_sample_ticks)
{
logf("pre-chks: %d", pre_chunks);
break;
}
}
#if 0
accum_rec_bytes = num_rec_bytes;
accum_pcm_samples = num_rec_samples;
#endif
}
enc_rd_index = rd_start;
/* filename queue should be empty */
if (!pcmrec_fnq_is_empty())
{
logf("fnq: not empty!");
pcmrec_fnq_set_empty();
}
flags = CHUNKF_START_FILE;
if (pre_sample_ticks > 0)
flags |= CHUNKF_PRERECORD;
pre_index = enc_rd_index;
dma_lock = false;
is_paused = false;
is_recording = true;
}
else
{
/* already recording, just split the stream */
logf("inserting split");
flags = CHUNKF_START_FILE | CHUNKF_END_FILE;
pre_index = 0;
}
pcmrec_new_stream(filename, flags, pre_index);
logf("pcmrec_record done");
} /* pcmrec_record */
/* PCMREC_STOP */
static void pcmrec_stop(void)
{
logf("pcmrec_stop");
if (is_recording)
{
dma_lock = true; /* lock dma write position */
/* flush all available data first to avoid overflow while waiting
for encoding to finish */
pcmrec_flush(PCMREC_FLUSH_ALL);
/* wait for encoder to finish remaining data */
while (errors == 0 && !pcm_buffer_empty)
yield();
/* end stream at last data */
pcmrec_new_stream(NULL, CHUNKF_END_FILE, 0);
/* flush anything else encoder added */
pcmrec_flush(PCMREC_FLUSH_ALL);
/* 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;
}
else
{
logf("not recording");
}
logf("pcmrec_stop done");
} /* pcmrec_stop */
/* PCMREC_PAUSE */
static void pcmrec_pause(void)
{
logf("pcmrec_pause");
if (!is_recording)
{
logf("not recording");
}
else if (is_paused)
{
logf("already paused");
}
else
{
dma_lock = true;
is_paused = true;
}
logf("pcmrec_pause done");
} /* pcmrec_pause */
/* PCMREC_RESUME */
static void pcmrec_resume(void)
{
logf("pcmrec_resume");
if (!is_recording)
{
logf("not recording");
}
else if (!is_paused)
{
logf("not paused");
}
else
{
is_paused = false;
is_recording = true;
dma_lock = false;
}
logf("pcmrec_resume done");
} /* pcmrec_resume */
static void pcmrec_thread(void) __attribute__((noreturn));
static void pcmrec_thread(void)
{
struct queue_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)
{
/* Messages that interrupt this will complete it */
pcmrec_flush(PCMREC_FLUSH_IF_HIGH |
PCMREC_FLUSH_INTERRUPTABLE);
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:
clear_flush_interrupt();
pcmrec_record((const char *)ev.data);
break;
case PCMREC_STOP:
clear_flush_interrupt();
pcmrec_stop();
break;
case PCMREC_PAUSE:
clear_flush_interrupt();
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();
usb_acknowledge(SYS_USB_CONNECTED_ACK);
usb_wait_for_disconnect(&pcmrec_queue);
flush_interrupts = 0;
break;
} /* end switch */
} /* end while */
} /* pcmrec_thread */
/****************************************************************************/
/* */
/* following functions will be called by the encoder codec */
/* in a free-threaded manner */
/* */
/****************************************************************************/
/* 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;
cancel_cpu_boost(); /* Make sure no boost remains */
return;
}
enc_sample_rate = params->enc_sample_rate;
logf("enc sampr:%lu", enc_sample_rate);
pcm_rd_pos = dma_wr_pos;
pcm_enc_pos = pcm_rd_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:%lu", 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:%lu", resbytes);
bufsize = rec_buffer_size - (enc_buffer - pcm_buffer) -
resbytes - FNQ_MIN_NUM_PATHS*MAX_PATH
#ifdef DEBUG
- 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:%lu", bufsize);
#ifdef DEBUG
/* add magic at wraparound for spillover checks */
wrap_id_p = SKIPBYTES((unsigned long *)enc_buffer, bufsize);
bufsize += sizeof (*wrap_id_p);
*wrap_id_p = ENC_CHUNK_MAGIC;
#endif
/** 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 /= MAX_PATH;
if (fnq_size > FNQ_MAX_NUM_PATHS)
fnq_size = FNQ_MAX_NUM_PATHS;
fnq_size *= MAX_PATH;
logf("fnq files:%ld", fnq_size / MAX_PATH);
#if defined(DEBUG)
logf("ab :%08lX", (uintptr_t)audiobuf);
logf("pcm:%08lX", (uintptr_t)pcm_buffer);
logf("enc:%08lX", (uintptr_t)enc_buffer);
logf("res:%08lX", (uintptr_t)params->reserve_buffer);
logf("wip:%08lX", (uintptr_t)wrap_id_p);
logf("fnq:%08lX", (uintptr_t)fn_queue);
logf("end:%08lX", (uintptr_t)fn_queue + fnq_size);
logf("abe:%08lX", (uintptr_t)audiobufend);
#endif
/* init all chunk headers and reset indexes */
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 DEBUG
chunk->id = ENC_CHUNK_MAGIC;
#endif
chunk->flags = 0;
}
logf("enc_set_parameters done");
} /* enc_set_parameters */
/* return encoder chunk at current write position -
NOTE: can be called by pcmrec thread when splitting streams */
struct enc_chunk_hdr * enc_get_chunk(void)
{
struct enc_chunk_hdr *chunk = GET_ENC_CHUNK(enc_wr_index);
#ifdef DEBUG
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 -
NOTE: can be called by pcmrec thread when splitting streams */
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");
}
/* 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 and put up warning flag */
warnings |= PCMREC_W_ENC_BUFFER_OVF;
logf("enc_buffer ovf");
DEC_ENC_INDEX(enc_wr_index);
if (pcmrec_context)
{
/* if stream splitting, keep this out of circulation and
flush a small number, then readd - cannot risk losing
stream markers */
logf("mini flush");
pcmrec_flush(PCMREC_FLUSH_MINI);
INC_ENC_INDEX(enc_wr_index);
}
}
else
{
/* advance enc_rd_index for prerecording */
INC_ENC_INDEX(enc_rd_index);
}
} /* enc_finish_chunk */
/* 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;
pcm_enc_pos = pcm_rd_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);
}
if (avail >= (sample_rate << 2))
{
/* Filling up - boost codec */
trigger_cpu_boost();
}
pcm_buffer_empty = false;
return ptr;
}
/* not enough data available - encoder should idle */
pcm_buffer_empty = true;
cancel_cpu_boost();
/* Sleep long enough to allow one frame on average */
sleep(0);
return NULL;
} /* enc_get_pcm_data */
/* puts some pcm data back in the queue */
size_t enc_unget_pcm_data(size_t size)
{
int wp = dma_wr_pos;
size_t old_avail = ((pcm_rd_pos - wp) & PCM_CHUNK_MASK) -
2*PCM_CHUNK_SIZE;
/* allow one interrupt to occur during this call and not have the
new read position inside the DMA destination chunk */
if ((ssize_t)old_avail > 0)
{
/* limit size to amount of old data remaining */
if (size > old_avail)
size = old_avail;
pcm_enc_pos = (pcm_rd_pos - size) & PCM_CHUNK_MASK;
pcm_rd_pos = pcm_enc_pos;
return size;
}
return 0;
} /* enc_unget_pcm_data */
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