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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2006 Antonius Hellmann
* Copyright (C) 2006-2013 Michael Sevakis
*
* 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 <inttypes.h>
#include <stdio.h>
#include "codeclib.h"
CODEC_ENC_HEADER
struct aiff_header
{
uint8_t form_id[4]; /* 00h - 'FORM' */
uint32_t form_size; /* 04h - size of file - 8 */
uint8_t aiff_id[4]; /* 08h - 'AIFF' */
uint8_t comm_id[4]; /* 0Ch - 'COMM' */
int32_t comm_size; /* 10h - num_channels through sample_rate
(18) */
int16_t num_channels; /* 14h - 1=M, 2=S, etc. */
uint32_t num_sample_frames; /* 16h - num samples for each channel */
int16_t sample_size; /* 1ah - 1-32 bits per sample */
uint8_t sample_rate[10]; /* 1ch - IEEE 754 80-bit floating point */
uint8_t ssnd_id[4]; /* 26h - "SSND" */
int32_t ssnd_size; /* 2ah - size of chunk from offset to
end of pcm data */
uint32_t offset; /* 2eh - data offset from end of header */
uint32_t block_size; /* 32h - pcm data alignment */
/* 36h */
} __attribute__((packed));
#define PCM_DEPTH_BYTES 2
#define PCM_DEPTH_BITS 16
#define PCM_SAMP_PER_CHUNK 2048
static int num_channels;
static uint32_t sample_rate;
static size_t frame_size;
static size_t pcm_size;
static uint32_t num_sample_frames;
/* Template headers */
static const struct aiff_header aiff_template_header =
{
{ 'F', 'O', 'R', 'M' }, /* form_id */
0, /* form_size (*) */
{ 'A', 'I', 'F', 'F' }, /* aiff_id */
{ 'C', 'O', 'M', 'M' }, /* comm_id */
htobe32(18), /* comm_size */
0, /* num_channels (*) */
0, /* num_sample_frames (*) */
htobe16(PCM_DEPTH_BITS), /* sample_size */
{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, /* sample_rate (*) */
{ 'S', 'S', 'N', 'D' }, /* ssnd_id */
0, /* ssnd_size (*) */
htobe32(0), /* offset */
htobe32(0), /* block_size */
/* (*) updated when finalizing stream */
};
static inline void frame_htobe(uint32_t *p, size_t size)
{
#ifdef ROCKBOX_LITTLE_ENDIAN
/* Byte-swap samples, stereo or mono */
do
{
uint32_t t;
t = swap_odd_even32(*p); *p++ = t;
t = swap_odd_even32(*p); *p++ = t;
t = swap_odd_even32(*p); *p++ = t;
t = swap_odd_even32(*p); *p++ = t;
t = swap_odd_even32(*p); *p++ = t;
t = swap_odd_even32(*p); *p++ = t;
t = swap_odd_even32(*p); *p++ = t;
t = swap_odd_even32(*p); *p++ = t;
}
while (size -= 8 * 2 * PCM_DEPTH_BYTES);
#endif /* ROCKBOX_LITTLE_ENDIAN */
(void)p; (void)size;
}
/* convert unsigned 32 bit value to 80-bit floating point number */
static void uint32_h_to_ieee754_extended_be(uint8_t f[10], uint32_t l)
{
ci->memset(f, 0, 10);
if (l == 0)
return;
int shift = __builtin_clz(l);
/* sign always zero - bit 79 */
/* exponent is 0-31 (normalized: 30 - shift + 16383) - bits 64-78 */
f[0] = 0x40;
f[1] = (uint8_t)(30 - shift);
/* mantissa is value left justified with most significant non-zero
bit stored in bit 63 - bits 0-63 */
l <<= shift;
f[2] = (uint8_t)(l >> 24);
f[3] = (uint8_t)(l >> 16);
f[4] = (uint8_t)(l >> 8);
f[5] = (uint8_t)(l >> 0);
}
static int on_stream_data(struct enc_chunk_data *data)
{
size_t size = data->hdr.size;
if (ci->enc_stream_write(data->data, size) != (ssize_t)size)
return -1;
pcm_size += size;
num_sample_frames += data->pcm_count;
return 0;
}
static int on_stream_start(void)
{
/* reset sample count */
pcm_size = 0;
num_sample_frames = 0;
/* write template header */
if (ci->enc_stream_write(&aiff_template_header,
sizeof (struct aiff_header))
!= sizeof (struct aiff_header))
return -1;
return 0;
}
static int on_stream_end(union enc_chunk_hdr *hdr)
{
/* update template header */
struct aiff_header aiff;
if (hdr->err)
{
/* Called for stream error; get correct data size */
ssize_t size = ci->enc_stream_lseek(0, SEEK_END);
if (size > (ssize_t)sizeof (aiff))
{
pcm_size = size - sizeof (aiff);
num_sample_frames = pcm_size / (PCM_DEPTH_BYTES*num_channels);
}
}
if (ci->enc_stream_lseek(0, SEEK_SET) != 0)
return -1;
if (ci->enc_stream_read(&aiff, sizeof (aiff)) != sizeof (aiff))
return -2;
/* 'FORM' chunk */
aiff.form_size = htobe32(pcm_size + sizeof (aiff) - 8);
/* 'COMM' chunk */
aiff.num_channels = htobe16(num_channels);
aiff.num_sample_frames = htobe32(num_sample_frames);
uint32_h_to_ieee754_extended_be(aiff.sample_rate, sample_rate);
/* 'SSND' chunk */
aiff.ssnd_size = htobe32(pcm_size + 8);
if (ci->enc_stream_lseek(0, SEEK_SET) != 0)
return -3;
if (ci->enc_stream_write(&aiff, sizeof (aiff)) != sizeof (aiff))
return -4;
return 0;
}
/* this is the codec entry point */
enum codec_status codec_main(enum codec_entry_call_reason reason)
{
return CODEC_OK;
(void)reason;
}
/* this is called for each file to process */
enum codec_status ICODE_ATTR codec_run(void)
{
enum { GETBUF_ENC, GETBUF_PCM } getbuf = GETBUF_ENC;
struct enc_chunk_data *data = NULL;
/* main encoding loop */
while (1)
{
enum codec_command_action action = ci->get_command(NULL);
if (action != CODEC_ACTION_NULL)
break;
/* First obtain output buffer; when available, get PCM data */
switch (getbuf)
{
case GETBUF_ENC:
if (!(data = ci->enc_encbuf_get_buffer(frame_size)))
continue;
getbuf = GETBUF_PCM;
case GETBUF_PCM:
if (!ci->enc_pcmbuf_read(data->data, PCM_SAMP_PER_CHUNK))
continue;
getbuf = GETBUF_ENC;
}
data->hdr.size = frame_size;
data->pcm_count = PCM_SAMP_PER_CHUNK;
frame_htobe((uint32_t *)data->data, frame_size);
ci->enc_pcmbuf_advance(PCM_SAMP_PER_CHUNK);
ci->enc_encbuf_finish_buffer();
}
return CODEC_OK;
}
/* this is called by recording system */
int ICODE_ATTR enc_callback(enum enc_callback_reason reason,
void *params)
{
if (LIKELY(reason == ENC_CB_STREAM))
{
switch (((union enc_chunk_hdr *)params)->type)
{
case CHUNK_T_DATA:
return on_stream_data(params);
case CHUNK_T_STREAM_START:
return on_stream_start();
case CHUNK_T_STREAM_END:
return on_stream_end(params);
}
}
else if (reason == ENC_CB_INPUTS)
{
struct enc_inputs *inputs = params;
sample_rate = inputs->sample_rate;
num_channels = inputs->num_channels;
frame_size = PCM_SAMP_PER_CHUNK*PCM_DEPTH_BYTES*num_channels;
}
return 0;
}
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