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#include "funcprotos.h"
#include <quicktime/quicktime.h>
#define LQT_LIBQUICKTIME
#include <quicktime/lqt_codecapi.h>
#include "ulaw.h"
/* We decode this many samples at a time */
#define SAMPLES_PER_BLOCK 1024
typedef struct
{
float *ulawtofloat_table;
float *ulawtofloat_ptr;
int16_t *ulawtoint16_table;
int16_t *ulawtoint16_ptr;
unsigned char *int16toulaw_table;
unsigned char *int16toulaw_ptr;
unsigned char *read_buffer;
long read_size;
int encode_initialized;
/* Decode specific stuff */
int decode_buffer_size;
int decode_buffer_alloc;
uint8_t * decode_buffer;
uint8_t * decode_buffer_ptr;
int16_t ** decode_sample_buffer_i;
int decode_sample_buffer_size;
int decode_sample_buffer_pos;
int decode_initialized;
int decode_block_align;
} quicktime_ulaw_codec_t;
/* ==================================== private for ulaw */
#define uBIAS 0x84
#define uCLIP 32635
static int ulaw_init_ulawtofloat(quicktime_t *file, int track);
static int ulaw_init_ulawtoint16(quicktime_t *file, int track)
{
int i;
quicktime_audio_map_t *atrack = &(file->atracks[track]);
quicktime_ulaw_codec_t *codec = ((quicktime_codec_t*)atrack->codec)->priv;
/* We use the floating point table to get values for the 16 bit table */
ulaw_init_ulawtofloat(file, track);
if(!codec->ulawtoint16_table)
{
codec->ulawtoint16_table = malloc(sizeof(int16_t) * 256);
codec->ulawtoint16_ptr = codec->ulawtoint16_table;
for(i = 0; i < 256; i++)
{
codec->ulawtoint16_table[i] = (int)(32768 * codec->ulawtofloat_ptr[i]);
}
}
return 0;
}
static int16_t ulaw_bytetoint16(quicktime_ulaw_codec_t *codec, unsigned char input)
{
return codec->ulawtoint16_ptr[input];
}
static int ulaw_init_ulawtofloat(quicktime_t *file, int track)
{
int i;
quicktime_ulaw_codec_t *codec = ((quicktime_codec_t*)file->atracks[track].codec)->priv;
if(!codec->ulawtofloat_table)
{
static int exp_lut[8] = { 0, 132, 396, 924, 1980, 4092, 8316, 16764 };
int sign, exponent, mantissa, sample;
unsigned char ulawbyte;
codec->ulawtofloat_table = malloc(sizeof(float) * 256);
codec->ulawtofloat_ptr = codec->ulawtofloat_table;
for(i = 0; i < 256; i++)
{
ulawbyte = (unsigned char)i;
ulawbyte = ~ulawbyte;
sign = (ulawbyte & 0x80);
exponent = (ulawbyte >> 4) & 0x07;
mantissa = ulawbyte & 0x0F;
sample = exp_lut[exponent] + (mantissa << (exponent + 3));
if(sign != 0) sample = -sample;
codec->ulawtofloat_ptr[i] = (float)sample / 32768;
}
}
return 0;
}
#if 0
static float ulaw_bytetofloat(quicktime_ulaw_codec_t *codec, unsigned char input)
{
return codec->ulawtofloat_ptr[input];
}
#endif
static int ulaw_init_int16toulaw(quicktime_t *file, int track)
{
quicktime_audio_map_t *atrack = &(file->atracks[track]);
quicktime_ulaw_codec_t *codec = ((quicktime_codec_t*)atrack->codec)->priv;
if(!codec->int16toulaw_table)
{
int sign, exponent, mantissa;
unsigned char ulawbyte;
int sample;
int i;
int exp_lut[256] = {0,0,1,1,2,2,2,2,3,3,3,3,3,3,3,3,
4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7};
codec->int16toulaw_table = malloc(65536);
codec->int16toulaw_ptr = codec->int16toulaw_table + 32768;
for(i = -32768; i < 32768; i++)
{
sample = i;
/* Get the sample into sign-magnitude. */
sign = (sample >> 8) & 0x80; /* set aside the sign */
if(sign != 0) sample = -sample; /* get magnitude */
if(sample > uCLIP) sample = uCLIP; /* clip the magnitude */
/* Convert from 16 bit linear to ulaw. */
sample = sample + uBIAS;
exponent = exp_lut[(sample >> 7) & 0xFF];
mantissa = (sample >> (exponent + 3)) & 0x0F;
ulawbyte = ~(sign | (exponent << 4) | mantissa);
#ifdef ZEROTRAP
if (ulawbyte == 0) ulawbyte = 0x02; /* optional CCITT trap */
#endif
codec->int16toulaw_ptr[i] = ulawbyte;
}
}
return 0;
}
static float ulaw_int16tobyte(quicktime_ulaw_codec_t *codec, int16_t input)
{
return codec->int16toulaw_ptr[input];
}
static float ulaw_floattobyte(quicktime_ulaw_codec_t *codec, float input)
{
return codec->int16toulaw_ptr[(int)(input * 32768)];
}
#if 1
static int ulaw_get_read_buffer(quicktime_t *file, int track, long samples)
{
quicktime_ulaw_codec_t *codec = ((quicktime_codec_t*)file->atracks[track].codec)->priv;
if(codec->read_buffer && codec->read_size != samples)
{
free(codec->read_buffer);
codec->read_buffer = 0;
}
if(!codec->read_buffer)
{
int64_t bytes = samples * file->atracks[track].channels;
codec->read_size = samples;
if(!(codec->read_buffer = malloc(bytes))) return 1;
}
return 0;
}
#endif
static int ulaw_delete_tables(quicktime_audio_map_t *atrack)
{
quicktime_ulaw_codec_t *codec = ((quicktime_codec_t*)atrack->codec)->priv;
if(codec->ulawtofloat_table)
{
free(codec->ulawtofloat_table);
}
if(codec->ulawtoint16_table)
{
free(codec->ulawtoint16_table);
}
if(codec->int16toulaw_table)
{
free(codec->int16toulaw_table);
}
if(codec->read_buffer) free(codec->read_buffer);
codec->int16toulaw_table = 0;
codec->ulawtoint16_table = 0;
codec->ulawtofloat_table = 0;
codec->read_buffer = 0;
codec->read_size = 0;
return 0;
}
/* =================================== public for ulaw */
static int quicktime_delete_codec_ulaw(quicktime_audio_map_t *atrack)
{
quicktime_ulaw_codec_t *codec = ((quicktime_codec_t*)atrack->codec)->priv;
if(codec->decode_sample_buffer_i)
{
free(codec->decode_sample_buffer_i[0]);
free(codec->decode_sample_buffer_i);
}
if(codec->decode_buffer)
{
free(codec->decode_buffer);
}
ulaw_delete_tables(atrack);
free(codec);
return 0;
}
static int quicktime_decode_ulaw(quicktime_t *file,
int16_t **output_i,
float **output_f,
long samples,
int track)
{
int j;
quicktime_audio_map_t *track_map = &(file->atracks[track]);
quicktime_ulaw_codec_t *codec = ((quicktime_codec_t*)track_map->codec)->priv;
int64_t chunk, chunk_sample;
int64_t i;
int samples_decoded, samples_copied;
int samples_to_skip = 0;
if(!codec->decode_initialized)
{
codec->decode_initialized = 1;
codec->decode_sample_buffer_i = malloc(sizeof(*(codec->decode_sample_buffer_i)) * file->atracks[track].channels);
codec->decode_sample_buffer_i[0] = malloc(sizeof(*(codec->decode_sample_buffer_i[0])) * file->atracks[track].channels *
SAMPLES_PER_BLOCK);
for(i = 1; i < file->atracks[track].channels; i++)
codec->decode_sample_buffer_i[i] = codec->decode_sample_buffer_i[0] + i * SAMPLES_PER_BLOCK;
ulaw_init_ulawtoint16(file, track);
codec->decode_block_align = track_map->channels;
/* Read first chunk */
codec->decode_buffer_size = lqt_read_audio_chunk(file,
track, file->atracks[track].current_chunk,
&(codec->decode_buffer),
&(codec->decode_buffer_alloc));
if(codec->decode_buffer_size <= 0)
return 0;
codec->decode_buffer_ptr = codec->decode_buffer;
}
if(file->atracks[track].current_position != file->atracks[track].last_position)
{
/* Seeking happened */
quicktime_chunk_of_sample(&chunk_sample, &chunk,
file->atracks[track].track,
file->atracks[track].current_position);
/* Read the chunk */
if(file->atracks[track].current_chunk != chunk)
{
file->atracks[track].current_chunk = chunk;
codec->decode_buffer_size = lqt_read_audio_chunk(file,
track, file->atracks[track].current_chunk,
&(codec->decode_buffer),
&(codec->decode_buffer_alloc));
if(codec->decode_buffer_size <= 0)
return 0;
codec->decode_buffer_ptr = codec->decode_buffer;
}
else
{
codec->decode_buffer_size += (int)(codec->decode_buffer_ptr - codec->decode_buffer);
codec->decode_buffer_ptr = codec->decode_buffer;
}
/* Skip frames */
samples_to_skip = file->atracks[track].current_position - chunk_sample;
if(samples_to_skip < 0)
{
fprintf(stderr, "ulaw: Cannot skip %d samples backwards %lld %ld\n", samples_to_skip,
(long long)(file->atracks[track].current_position), file->atracks[track].last_position);
samples_to_skip = 0;
}
codec->decode_buffer_ptr = codec->decode_buffer + samples_to_skip * codec->decode_block_align;
codec->decode_buffer_size -= samples_to_skip * codec->decode_block_align;
codec->decode_sample_buffer_size = 0;
codec->decode_sample_buffer_pos = 0;
}
/* Decode until we are done */
samples_decoded = 0;
while(samples_decoded < samples)
{
/* Decode new frame if necessary */
if(!codec->decode_sample_buffer_size)
{
/* Get new chunk if necessary */
if(!codec->decode_buffer_size)
{
file->atracks[track].current_chunk++;
codec->decode_buffer_size = lqt_read_audio_chunk(file,
track, file->atracks[track].current_chunk,
&(codec->decode_buffer),
&(codec->decode_buffer_alloc));
if(codec->decode_buffer_size <= 0)
break;
codec->decode_buffer_ptr = codec->decode_buffer;
}
codec->decode_sample_buffer_size = codec->decode_buffer_size / codec->decode_block_align;
if(codec->decode_sample_buffer_size > SAMPLES_PER_BLOCK)
{
codec->decode_sample_buffer_size = SAMPLES_PER_BLOCK;
}
codec->decode_sample_buffer_pos = 0;
/* Decode the stuff */
for(i = 0; i < codec->decode_sample_buffer_size; i++)
{
for(j = 0; j < track_map->channels; j++)
{
codec->decode_sample_buffer_i[j][i] = ulaw_bytetoint16(codec, *codec->decode_buffer_ptr);
codec->decode_buffer_ptr++;
codec->decode_buffer_size--;
}
}
}
/* Copy samples */
samples_copied = lqt_copy_audio(output_i, // int16_t ** dst_i
output_f, // float ** dst_f
codec->decode_sample_buffer_i, // int16_t ** src_i
NULL, // float ** src_f
samples_decoded, // int dst_pos
codec->decode_sample_buffer_pos, // int src_pos
samples - samples_decoded, // int dst_size
codec->decode_sample_buffer_size, // int src_size
file->atracks[track].channels); // int num_channels
// fprintf(stderr, "Decode %d %d %d\n", codec->decode_sample_buffer_size, samples_copied, samples);
samples_decoded += samples_copied;
codec->decode_sample_buffer_size -= samples_copied;
codec->decode_sample_buffer_pos += samples_copied;
}
file->atracks[track].last_position = file->atracks[track].current_position + samples_decoded;
return samples_decoded;
}
static int quicktime_encode_ulaw(quicktime_t *file,
int16_t **input_i,
float **input_f,
int track,
long samples)
{
int result = 0;
int channel, step;
quicktime_ulaw_codec_t *codec = ((quicktime_codec_t*)file->atracks[track].codec)->priv;
quicktime_atom_t chunk_atom;
quicktime_audio_map_t *track_map = &file->atracks[track];
quicktime_trak_t *trak = track_map->track;
if(!codec->encode_initialized)
{
if(trak->strl)
{
/* strh stuff */
trak->strl->dwRate = trak->mdia.minf.stbl.stsd.table[0].sample_rate * track_map->channels;
trak->strl->dwScale = track_map->channels;
trak->strl->dwSampleSize = 1;
/* WAVEFORMATEX stuff */
trak->strl->nBlockAlign = trak->strl->dwScale;
trak->strl->nAvgBytesPerSec = trak->strl->dwRate;
trak->strl->wBitsPerSample = 8;
}
codec->encode_initialized = 1;
}
result = ulaw_init_int16toulaw(file, track);
result += ulaw_get_read_buffer(file, track, samples);
if(!result)
{
step = file->atracks[track].channels;
if(input_f)
{
for(channel = 0; channel < file->atracks[track].channels; channel++)
{
float *input_ptr = input_f[channel];
float *input_end = input_f[channel] + samples;
unsigned char *output = codec->read_buffer + channel;
while(input_ptr < input_end)
{
*output = ulaw_floattobyte(codec, *input_ptr++);
output += step;
}
}
}
else
if(input_i)
{
for(channel = 0; channel < file->atracks[track].channels; channel++)
{
int16_t *input_ptr = input_i[channel];
int16_t *input_end = input_i[channel] + samples;
unsigned char *output = codec->read_buffer + channel;
while(input_ptr < input_end)
{
*output = ulaw_int16tobyte(codec, *input_ptr++);
output += step;
}
}
}
quicktime_write_chunk_header(file, trak, &chunk_atom);
result = quicktime_write_data(file,
codec->read_buffer,
samples * file->atracks[track].channels);
quicktime_write_chunk_footer(file,
trak,
track_map->current_chunk,
&chunk_atom,
samples);
/* defeat fwrite's return */
if(result)
result = 0;
else
result = 1;
file->atracks[track].current_chunk++;
}
return result;
}
void quicktime_init_codec_ulaw(quicktime_audio_map_t *atrack)
{
quicktime_codec_t *codec_base = (quicktime_codec_t*)atrack->codec;
quicktime_ulaw_codec_t *codec;
/* Init public items */
codec_base->priv = calloc(1, sizeof(quicktime_ulaw_codec_t));
codec_base->delete_acodec = quicktime_delete_codec_ulaw;
codec_base->decode_video = 0;
codec_base->encode_video = 0;
codec_base->decode_audio = quicktime_decode_ulaw;
codec_base->encode_audio = quicktime_encode_ulaw;
codec_base->fourcc = QUICKTIME_ULAW;
codec_base->title = "uLaw";
codec_base->desc = "uLaw";
codec_base->wav_id = 0x07;
/* Init private items */
codec = ((quicktime_codec_t*)atrack->codec)->priv;
}
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