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#include "funcprotos.h"
#include <quicktime/quicktime.h>
#define LQT_LIBQUICKTIME
#include <quicktime/lqt_codecapi.h>
#include "twos.h"
/* We decode this many samples at a time */
#define SAMPLES_PER_BLOCK 1024
/* =================================== private for twos */
typedef struct
{
uint8_t *work_buffer;
long buffer_size;
int le; /* For 8 bits means unsigned operation, for more bits, little endian */
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;
float ** decode_sample_buffer_f;
int decode_sample_buffer_size;
int decode_sample_buffer_pos;
int decode_initialized;
int decode_block_align;
} quicktime_twos_codec_t;
static int byte_order(void)
{ /* 1 if little endian */
int16_t byteordertest;
int byteorder;
byteordertest = 0x0001;
byteorder = *((unsigned char *)&byteordertest);
return byteorder;
}
static int get_work_buffer(quicktime_t *file, int track, long bytes)
{
quicktime_twos_codec_t *codec = ((quicktime_codec_t*)file->atracks[track].codec)->priv;
if(codec->buffer_size < bytes)
{
codec->buffer_size = bytes + 128;
codec->work_buffer = realloc(codec->work_buffer, codec->buffer_size);
}
return 0;
}
/* =================================== public for twos */
static int delete_codec(quicktime_audio_map_t *atrack)
{
quicktime_twos_codec_t *codec = ((quicktime_codec_t*)atrack->codec)->priv;
if(codec->work_buffer) free(codec->work_buffer);
codec->work_buffer = 0;
codec->buffer_size = 0;
if(codec->decode_sample_buffer_i)
{
free(codec->decode_sample_buffer_i[0]);
free(codec->decode_sample_buffer_i);
}
if(codec->decode_sample_buffer_f)
{
free(codec->decode_sample_buffer_f[0]);
free(codec->decode_sample_buffer_f);
}
if(codec->decode_buffer)
free(codec->decode_buffer);
free(codec);
return 0;
}
static int swap_bytes(uint8_t *buffer, long samples, int bits)
{
long i = 0;
char byte1;
uint8_t *buffer1, *buffer2;
switch(bits)
{
case 8:
/* Swap sign */
for(i = 0; i < samples; i++)
buffer[i] ^= 0x80;
break;
case 16:
if(!byte_order()) return 0;
buffer1 = buffer;
buffer2 = buffer + 1;
while(i < samples * 2)
{
byte1 = buffer2[i];
buffer2[i] = buffer1[i];
buffer1[i] = byte1;
i += 2;
}
break;
case 24:
if(!byte_order()) return 0;
buffer1 = buffer;
buffer2 = buffer + 2;
while(i < samples * 3)
{
byte1 = buffer2[i];
buffer2[i] = buffer1[i];
buffer1[i] = byte1;
i += 3;
}
break;
default:
break;
}
return 0;
}
static int decode(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_twos_codec_t *codec = ((quicktime_codec_t*)track_map->codec)->priv;
int64_t chunk, chunk_sample;
int64_t i;
int samples_decoded, samples_copied;
int64_t samples_to_skip = 0;
int bits;
bits = quicktime_audio_bits(file, track);
// fprintf(stderr, "Bits: %d\n", bits);
if(!codec->decode_initialized)
{
codec->decode_initialized = 1;
if(bits <= 16)
{
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;
}
else
{
codec->decode_sample_buffer_f = malloc(sizeof(*(codec->decode_sample_buffer_f)) * file->atracks[track].channels);
codec->decode_sample_buffer_f[0] = malloc(sizeof(*(codec->decode_sample_buffer_f[0])) * file->atracks[track].channels *
SAMPLES_PER_BLOCK);
for(i = 1; i < file->atracks[track].channels; i++)
codec->decode_sample_buffer_f[i] = codec->decode_sample_buffer_f[0] + i * SAMPLES_PER_BLOCK;
}
codec->decode_block_align = track_map->channels * bits / 8;
/* 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;
/* Handle AVI byte order */
if(codec->le)
swap_bytes(codec->decode_buffer,
(codec->decode_buffer_size * track_map->channels) / codec->decode_block_align,
quicktime_audio_bits(file, track));
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;
if(codec->le)
swap_bytes(codec->decode_buffer,
(codec->decode_buffer_size * track_map->channels) / codec->decode_block_align,
quicktime_audio_bits(file, track));
}
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, "twos: Cannot skip backwards\n");
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;
/* Handle AVI byte order */
if(codec->le)
swap_bytes(codec->decode_buffer,
(codec->decode_buffer_size * track_map->channels) / codec->decode_block_align,
quicktime_audio_bits(file, track));
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 */
switch(bits)
{
case 8:
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] = ((int16_t)(*codec->decode_buffer_ptr)) << 8;
codec->decode_buffer_ptr++;
codec->decode_buffer_size--;
}
}
break;
case 16:
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] = ((int16_t)codec->decode_buffer_ptr[0]) << 8 |
((unsigned char)codec->decode_buffer_ptr[1]);
codec->decode_buffer_ptr+= 2;
codec->decode_buffer_size-=2;
}
}
break;
case 24:
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] = (float)((((int)codec->decode_buffer_ptr[0]) << 16) |
(((unsigned char)codec->decode_buffer_ptr[1]) << 8) |
((unsigned char)codec->decode_buffer_ptr[2])) / 0x7fffff;
codec->decode_buffer_ptr+= 3;
codec->decode_buffer_size-=3;
}
}
break;
default:
break;
}
}
/* Copy samples */
// fprintf(stderr, "Copy samples: %d\n", codec->decode_buffer_size);
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
codec->decode_sample_buffer_f, // 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
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;
#if 0 /* Old (hopefully obsolete version) */
int step = track_map->channels * quicktime_audio_bits(file, track) / 8;
get_work_buffer(file, track, samples * step);
/*
* printf("decode 1 %d\n", quicktime_audio_bits(file, track));
* sleep(1);
*/
result = !quicktime_read_audio(file, codec->work_buffer, samples, track);
/* Undo increment since this is done in codecs.c */
track_map->current_position -= samples;
/* Handle AVI byte order */
if(codec->le)
swap_bytes(codec->work_buffer,
samples,
track_map->channels,
quicktime_audio_bits(file, track));
switch(quicktime_audio_bits(file, track))
{
case 8:
if(output_i && !result)
{
for(i = 0, j = channel; i < samples; i++)
{
output_i[i] = ((int16_t)codec->work_buffer[j]) << 8;
j += step;
}
}
else
if(output_f && !result)
{
for(i = 0, j = channel; i < samples; i++)
{
output_f[i] = ((float)codec->work_buffer[j]) / 0x7f;
j += step;
}
}
break;
case 16:
if(output_i && !result)
{
for(i = 0, j = channel * 2; i < samples; i++)
{
output_i[i] = ((int16_t)codec->work_buffer[j]) << 8 |
((unsigned char)codec->work_buffer[j + 1]);
j += step;
}
}
else
if(output_f && !result)
{
for(i = 0, j = channel * 2; i < samples; i++)
{
output_f[i] = (float)((((int16_t)codec->work_buffer[j]) << 8) |
((unsigned char)codec->work_buffer[j + 1])) / 0x7fff;
j += step;
}
}
break;
case 24:
if(output_i && !result)
{
for(i = 0, j = channel * 3; i < samples; i++)
{
output_i[i] = (((int16_t)codec->work_buffer[j]) << 8) |
((unsigned char)codec->work_buffer[j + 1]);
j += step;
}
}
else
if(output_f && !result)
{
for(i = 0, j = channel * 3; i < samples; i++)
{
output_f[i] = (float)((((int)codec->work_buffer[j]) << 16) |
(((unsigned char)codec->work_buffer[j + 1]) << 8) |
((unsigned char)codec->work_buffer[j + 2])) / 0x7fffff;
j += step;
}
}
break;
default:
break;
}
return result;
#endif
}
#define CLAMP(x, y, z) ((x) = ((x) < (y) ? (y) : ((x) > (z) ? (z) : (x))))
static int encode(quicktime_t *file,
int16_t **input_i,
float **input_f,
int track,
long samples)
{
int result = 0;
long i, j;
quicktime_trak_t *trak;
quicktime_audio_map_t *track_map = &(file->atracks[track]);
quicktime_twos_codec_t *codec = ((quicktime_codec_t*)track_map->codec)->priv;
int step = track_map->channels * quicktime_audio_bits(file, track) / 8;
int sample;
float sample_f;
int bits = quicktime_audio_bits(file, track);
if(!codec->encode_initialized)
{
trak = track_map->track;
if(trak->strl)
{
/* strh stuff */
trak->strl->dwRate = (trak->mdia.minf.stbl.stsd.table[0].sample_rate * track_map->channels * bits) / 8;
trak->strl->dwScale = (track_map->channels * bits) / 8;
trak->strl->dwSampleSize = bits/8;
/* WAVEFORMATEX stuff */
trak->strl->nBlockAlign = trak->strl->dwScale;
trak->strl->nAvgBytesPerSec = trak->strl->dwRate;
trak->strl->wBitsPerSample = bits;
}
codec->encode_initialized = 1;
}
get_work_buffer(file, track, samples * step);
if(input_i)
{
for(i = 0; i < track_map->channels; i++)
{
switch(bits)
{
case 8:
for(j = 0; j < samples; j++)
{
sample = input_i[i][j] >> 8;
codec->work_buffer[j * step + i] = sample;
}
break;
case 16:
for(j = 0; j < samples; j++)
{
sample = input_i[i][j];
codec->work_buffer[j * step + i * 2] = ((unsigned int)sample & 0xff00) >> 8;
codec->work_buffer[j * step + i * 2 + 1] = ((unsigned int)sample) & 0xff;
}
break;
case 24:
for(j = 0; j < samples; j++)
{
sample = input_i[i][j];
codec->work_buffer[j * step + i * 3] = ((unsigned int)sample & 0xff00) >> 8;
codec->work_buffer[j * step + i * 3 + 1] = ((unsigned int)sample & 0xff);
codec->work_buffer[j * step + i * 3 + 2] = 0;
}
break;
}
}
}
else
{
for(i = 0; i < track_map->channels; i++)
{
switch(quicktime_audio_bits(file, track))
{
case 8:
for(j = 0; j < samples; j++)
{
sample_f = input_f[i][j];
if(sample_f < 0)
sample = (int)(sample_f * 0x7f - 0.5);
else
sample = (int)(sample_f * 0x7f + 0.5);
CLAMP(sample, -0x7f, 0x7f);
codec->work_buffer[j * step + i] = sample;
}
break;
case 16:
for(j = 0; j < samples; j++)
{
sample_f = input_f[i][j];
if(sample_f < 0)
sample = (int)(sample_f * 0x7fff - 0.5);
else
sample = (int)(sample_f * 0x7fff + 0.5);
CLAMP(sample, -0x7fff, 0x7fff);
codec->work_buffer[j * step + i * 2] = ((unsigned int)sample & 0xff00) >> 8;
codec->work_buffer[j * step + i * 2 + 1] = ((unsigned int)sample) & 0xff;
}
break;
case 24:
for(j = 0; j < samples; j++)
{
sample_f = input_f[i][j];
if(sample_f < 0)
sample = (int)(sample_f * 0x7fffff - 0.5);
else
sample = (int)(sample_f * 0x7fffff + 0.5);
CLAMP(sample, -0x7fffff, 0x7fffff);
codec->work_buffer[j * step + i * 3] = ((unsigned int)sample & 0xff0000) >> 16;
codec->work_buffer[j * step + i * 3 + 1] = ((unsigned int)sample & 0xff00) >> 8;
codec->work_buffer[j * step + i * 3 + 2] = ((unsigned int)sample) & 0xff;
}
break;
}
}
}
/* Handle AVI byte order */
if(codec->le)
swap_bytes(codec->work_buffer,
samples *
track_map->channels,
quicktime_audio_bits(file, track));
result = quicktime_write_audio(file, codec->work_buffer, samples, track);
return result;
}
void quicktime_init_codec_twos(quicktime_audio_map_t *atrack)
{
quicktime_twos_codec_t *codec;
quicktime_codec_t *codec_base = (quicktime_codec_t*)atrack->codec;
/* Init public items */
codec_base->delete_acodec = delete_codec;
codec_base->decode_audio = decode;
codec_base->encode_audio = encode;
codec_base->fourcc = QUICKTIME_TWOS;
codec_base->title = "Twos complement";
codec_base->desc = "Twos complement";
/* Init private items */
codec = codec_base->priv = calloc(1, sizeof(quicktime_twos_codec_t));
codec->work_buffer = 0;
codec->buffer_size = 0;
}
void quicktime_init_codec_sowt(quicktime_audio_map_t *atrack)
{
quicktime_twos_codec_t *codec;
quicktime_codec_t *codec_base = (quicktime_codec_t*)atrack->codec;
/* Init public items */
codec_base->delete_acodec = delete_codec;
codec_base->decode_audio = decode;
codec_base->encode_audio = encode;
codec_base->fourcc = "SOWT";
codec_base->title = "Twos complement (Little endian)";
codec_base->desc = "Twos complement (Little endian)";
codec_base->wav_id = 0x01;
/* Init private items */
codec = codec_base->priv = calloc(1, sizeof(quicktime_twos_codec_t));
codec->work_buffer = 0;
codec->buffer_size = 0;
codec->le = 1;
}
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