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k9copy/k9decmpeg/decode.cpp

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/*
* decode.c
* Copyright (C) 2000-2003 Michel Lespinasse <walken@zoy.org>
* Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
*
* This file is part of mpeg2dec, a free MPEG-2 video stream decoder.
* See http://libmpeg2.sourceforge.net/ for updates.
*
* mpeg2dec 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.
*
* mpeg2dec is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#include "k9common.h"
#include <string.h> /* memcmp/memset, try to remove */
#include <stdlib.h>
#include "mpeg2.h"
#include "attributes.h"
#include "mpeg2_internal.h"
static int mpeg2_accels = 0;
#define BUFFER_SIZE (1194 * 1024)
const mpeg2_info_t * mpeg2_info (mpeg2dec_t * mpeg2dec)
{
return &(mpeg2dec->info);
}
static inline int skip_chunk (mpeg2dec_t * mpeg2dec, int bytes)
{
uint8_t * current;
uint32_t shift;
uint8_t * limit;
uint8_t byte;
if (!bytes)
return 0;
current = mpeg2dec->buf_start;
shift = mpeg2dec->shift;
limit = current + bytes;
do {
byte = *current++;
if (shift == 0x00000100) {
int skipped;
mpeg2dec->shift = 0xffffff00;
skipped = current - mpeg2dec->buf_start;
mpeg2dec->buf_start = current;
return skipped;
}
shift = (shift | byte) << 8;
} while (current < limit);
mpeg2dec->shift = shift;
mpeg2dec->buf_start = current;
return 0;
}
static inline int copy_chunk (mpeg2dec_t * mpeg2dec, int bytes)
{
uint8_t * current;
uint32_t shift;
uint8_t * chunk_ptr;
uint8_t * limit;
uint8_t byte;
if (!bytes)
return 0;
current = mpeg2dec->buf_start;
shift = mpeg2dec->shift;
chunk_ptr = mpeg2dec->chunk_ptr;
limit = current + bytes;
do {
byte = *current++;
if (shift == 0x00000100) {
int copied;
mpeg2dec->shift = 0xffffff00;
mpeg2dec->chunk_ptr = chunk_ptr + 1;
copied = current - mpeg2dec->buf_start;
mpeg2dec->buf_start = current;
return copied;
}
shift = (shift | byte) << 8;
*chunk_ptr++ = byte;
} while (current < limit);
mpeg2dec->shift = shift;
mpeg2dec->buf_start = current;
return 0;
}
void mpeg2_buffer (mpeg2dec_t * mpeg2dec, uint8_t * start, uint8_t * end)
{
mpeg2dec->buf_start = start;
mpeg2dec->buf_end = end;
}
int mpeg2_getpos (mpeg2dec_t * mpeg2dec)
{
return mpeg2dec->buf_end - mpeg2dec->buf_start;
}
static inline mpeg2_state_t seek_chunk (mpeg2dec_t * mpeg2dec)
{
int size, skipped;
size = mpeg2dec->buf_end - mpeg2dec->buf_start;
skipped = skip_chunk (mpeg2dec, size);
if (!skipped) {
mpeg2dec->bytes_since_tag += size;
return STATE_BUFFER;
}
mpeg2dec->bytes_since_tag += skipped;
mpeg2dec->code = mpeg2dec->buf_start[-1];
return (mpeg2_state_t)-1;
}
mpeg2_state_t mpeg2_seek_header (mpeg2dec_t * mpeg2dec)
{
while (mpeg2dec->code != 0xb3 &&
((mpeg2dec->code != 0xb7 && mpeg2dec->code != 0xb8 &&
mpeg2dec->code) || mpeg2dec->sequence.width == (unsigned)-1))
if (seek_chunk (mpeg2dec) == STATE_BUFFER)
return STATE_BUFFER;
mpeg2dec->chunk_start = mpeg2dec->chunk_ptr = mpeg2dec->chunk_buffer;
mpeg2dec->user_data_len = 0;
return (mpeg2dec->code ? mpeg2_parse_header (mpeg2dec) :
mpeg2_header_picture_start (mpeg2dec));
}
#define RECEIVED(code,state) (((state) << 8) + (code))
mpeg2_state_t mpeg2_parse (mpeg2dec_t * mpeg2dec)
{
int size_buffer, size_chunk, copied;
if (mpeg2dec->action) {
mpeg2_state_t state;
state = mpeg2dec->action (mpeg2dec);
if ((int)state >= 0)
return state;
}
while (1) {
while ((unsigned) (mpeg2dec->code - mpeg2dec->first_decode_slice) <
mpeg2dec->nb_decode_slices) {
size_buffer = mpeg2dec->buf_end - mpeg2dec->buf_start;
size_chunk = (mpeg2dec->chunk_buffer + BUFFER_SIZE -
mpeg2dec->chunk_ptr);
if (size_buffer <= size_chunk) {
copied = copy_chunk (mpeg2dec, size_buffer);
if (!copied) {
mpeg2dec->bytes_since_tag += size_buffer;
mpeg2dec->chunk_ptr += size_buffer;
return STATE_BUFFER;
}
} else {
copied = copy_chunk (mpeg2dec, size_chunk);
if (!copied) {
/* filled the chunk buffer without finding a start code */
mpeg2dec->bytes_since_tag += size_chunk;
mpeg2dec->action = seek_chunk;
return STATE_INVALID;
}
}
mpeg2dec->bytes_since_tag += copied;
mpeg2_slice (&(mpeg2dec->decoder), mpeg2dec->code,
mpeg2dec->chunk_start);
mpeg2dec->code = mpeg2dec->buf_start[-1];
mpeg2dec->chunk_ptr = mpeg2dec->chunk_start;
}
if ((unsigned) (mpeg2dec->code - 1) >= 0xb0 - 1)
break;
if (seek_chunk (mpeg2dec) == STATE_BUFFER)
return STATE_BUFFER;
}
switch (mpeg2dec->code) {
case 0x00:
mpeg2dec->action = mpeg2_header_picture_start;
return mpeg2dec->state;
case 0xb7:
mpeg2dec->action = mpeg2_header_end;
break;
case 0xb3:
case 0xb8:
mpeg2dec->action = mpeg2_parse_header;
break;
default:
mpeg2dec->action = seek_chunk;
return STATE_INVALID;
}
return (mpeg2dec->state == STATE_SLICE) ? STATE_SLICE : STATE_INVALID;
}
mpeg2_state_t mpeg2_parse_header (mpeg2dec_t * mpeg2dec)
{
static int (* process_header[]) (mpeg2dec_t * mpeg2dec) = {
mpeg2_header_picture, mpeg2_header_extension, mpeg2_header_user_data,
mpeg2_header_sequence, NULL, NULL, NULL, NULL, mpeg2_header_gop
};
int size_buffer, size_chunk, copied;
mpeg2dec->action = mpeg2_parse_header;
mpeg2dec->info.user_data = NULL; mpeg2dec->info.user_data_len = 0;
while (1) {
size_buffer = mpeg2dec->buf_end - mpeg2dec->buf_start;
size_chunk = (mpeg2dec->chunk_buffer + BUFFER_SIZE -
mpeg2dec->chunk_ptr);
if (size_buffer <= size_chunk) {
copied = copy_chunk (mpeg2dec, size_buffer);
if (!copied) {
mpeg2dec->bytes_since_tag += size_buffer;
mpeg2dec->chunk_ptr += size_buffer;
return STATE_BUFFER;
}
} else {
copied = copy_chunk (mpeg2dec, size_chunk);
if (!copied) {
/* filled the chunk buffer without finding a start code */
mpeg2dec->bytes_since_tag += size_chunk;
mpeg2dec->code = 0xb4;
mpeg2dec->action = mpeg2_seek_header;
return STATE_INVALID;
}
}
mpeg2dec->bytes_since_tag += copied;
if (process_header[mpeg2dec->code & 0x0b] (mpeg2dec)) {
mpeg2dec->code = mpeg2dec->buf_start[-1];
mpeg2dec->action = mpeg2_seek_header;
return STATE_INVALID;
}
mpeg2dec->code = mpeg2dec->buf_start[-1];
switch (RECEIVED (mpeg2dec->code, mpeg2dec->state)) {
/* state transition after a sequence header */
case RECEIVED (0x00, STATE_SEQUENCE):
mpeg2dec->action = mpeg2_header_picture_start;
case RECEIVED (0xb8, STATE_SEQUENCE):
mpeg2_header_sequence_finalize (mpeg2dec);
break;
/* other legal state transitions */
case RECEIVED (0x00, STATE_GOP):
mpeg2_header_gop_finalize (mpeg2dec);
mpeg2dec->action = mpeg2_header_picture_start;
break;
case RECEIVED (0x01, STATE_PICTURE):
case RECEIVED (0x01, STATE_PICTURE_2ND):
mpeg2_header_picture_finalize (mpeg2dec, mpeg2_accels);
mpeg2dec->action = mpeg2_header_slice_start;
break;
/* legal headers within a given state */
case RECEIVED (0xb2, STATE_SEQUENCE):
case RECEIVED (0xb2, STATE_GOP):
case RECEIVED (0xb2, STATE_PICTURE):
case RECEIVED (0xb2, STATE_PICTURE_2ND):
case RECEIVED (0xb5, STATE_SEQUENCE):
case RECEIVED (0xb5, STATE_PICTURE):
case RECEIVED (0xb5, STATE_PICTURE_2ND):
mpeg2dec->chunk_ptr = mpeg2dec->chunk_start;
continue;
default:
mpeg2dec->action = mpeg2_seek_header;
return STATE_INVALID;
}
mpeg2dec->chunk_start = mpeg2dec->chunk_ptr = mpeg2dec->chunk_buffer;
mpeg2dec->user_data_len = 0;
return mpeg2dec->state;
}
}
int mpeg2_convert (mpeg2dec_t * mpeg2dec, mpeg2_convert_t convert, void * arg)
{
mpeg2_convert_init_t convert_init;
int error;
error = convert (MPEG2_CONVERT_SET, NULL, &(mpeg2dec->sequence), 0,
mpeg2_accels, arg, &convert_init);
if (!error) {
mpeg2dec->convert = convert;
mpeg2dec->convert_arg = arg;
mpeg2dec->convert_id_size = convert_init.id_size;
mpeg2dec->convert_stride = 0;
}
return error;
}
int mpeg2_stride (mpeg2dec_t * mpeg2dec, int stride)
{
if (!mpeg2dec->convert) {
if (stride < (int) mpeg2dec->sequence.width)
stride = mpeg2dec->sequence.width;
mpeg2dec->decoder.stride_frame = stride;
} else {
mpeg2_convert_init_t convert_init;
stride = mpeg2dec->convert (MPEG2_CONVERT_STRIDE, NULL,
&(mpeg2dec->sequence), stride,
mpeg2_accels, mpeg2dec->convert_arg,
&convert_init);
mpeg2dec->convert_id_size = convert_init.id_size;
mpeg2dec->convert_stride = stride;
}
return stride;
}
void mpeg2_set_buf (mpeg2dec_t * mpeg2dec, uint8_t * buf[3], void * id)
{
mpeg2_fbuf_t * fbuf;
if (mpeg2dec->custom_fbuf) {
if (mpeg2dec->state == STATE_SEQUENCE) {
mpeg2dec->fbuf[2] = mpeg2dec->fbuf[1];
mpeg2dec->fbuf[1] = mpeg2dec->fbuf[0];
}
mpeg2_set_fbuf (mpeg2dec, (mpeg2dec->decoder.coding_type ==
PIC_FLAG_CODING_TYPE_B));
fbuf = mpeg2dec->fbuf[0];
} else {
fbuf = &(mpeg2dec->fbuf_alloc[mpeg2dec->alloc_index].fbuf);
mpeg2dec->alloc_index_user = ++mpeg2dec->alloc_index;
}
fbuf->buf[0] = buf[0];
fbuf->buf[1] = buf[1];
fbuf->buf[2] = buf[2];
fbuf->id = id;
}
void mpeg2_custom_fbuf (mpeg2dec_t * mpeg2dec, int custom_fbuf)
{
mpeg2dec->custom_fbuf = custom_fbuf;
}
void mpeg2_skip (mpeg2dec_t * mpeg2dec, int skip)
{
mpeg2dec->first_decode_slice = 1;
mpeg2dec->nb_decode_slices = skip ? 0 : (0xb0 - 1);
}
void mpeg2_slice_region (mpeg2dec_t * mpeg2dec, int start, int end)
{
start = (start < 1) ? 1 : (start > 0xb0) ? 0xb0 : start;
end = (end < start) ? start : (end > 0xb0) ? 0xb0 : end;
mpeg2dec->first_decode_slice = start;
mpeg2dec->nb_decode_slices = end - start;
}
void mpeg2_tag_picture (mpeg2dec_t * mpeg2dec, uint32_t tag, uint32_t tag2)
{
mpeg2dec->tag_previous = mpeg2dec->tag_current;
mpeg2dec->tag2_previous = mpeg2dec->tag2_current;
mpeg2dec->tag_current = tag;
mpeg2dec->tag2_current = tag2;
mpeg2dec->num_tags++;
mpeg2dec->bytes_since_tag = 0;
}
uint32_t mpeg2_accel (uint32_t accel)
{
if (!mpeg2_accels) {
if (accel & MPEG2_ACCEL_DETECT)
accel |= mpeg2_detect_accel ();
mpeg2_accels = accel |= MPEG2_ACCEL_DETECT;
mpeg2_cpu_state_init (accel);
mpeg2_idct_init (accel);
mpeg2_mc_init (accel);
}
return mpeg2_accels & ~MPEG2_ACCEL_DETECT;
}
void mpeg2_reset (mpeg2dec_t * mpeg2dec, int full_reset)
{
mpeg2dec->buf_start = mpeg2dec->buf_end = NULL;
mpeg2dec->num_tags = 0;
mpeg2dec->shift = 0xffffff00;
mpeg2dec->code = 0xb4;
mpeg2dec->action = mpeg2_seek_header;
mpeg2dec->state = STATE_INVALID;
mpeg2dec->first = 1;
mpeg2_reset_info(&(mpeg2dec->info));
mpeg2dec->info.gop = NULL;
mpeg2dec->info.user_data = NULL;
mpeg2dec->info.user_data_len = 0;
if (full_reset) {
mpeg2dec->info.sequence = NULL;
mpeg2_header_state_init (mpeg2dec);
}
}
mpeg2dec_t * mpeg2_init (void)
{
mpeg2dec_t * mpeg2dec;
mpeg2_accel (MPEG2_ACCEL_DETECT);
mpeg2dec = (mpeg2dec_t *) mpeg2_malloc (sizeof (mpeg2dec_t),
MPEG2_ALLOC_MPEG2DEC);
if (mpeg2dec == NULL)
return NULL;
memset (mpeg2dec->decoder.DCTblock, 0, 64 * sizeof (int16_t));
memset (mpeg2dec->quantizer_matrix, 0, 4 * 64 * sizeof (uint8_t));
mpeg2dec->chunk_buffer = (uint8_t *) mpeg2_malloc (BUFFER_SIZE + 4,
MPEG2_ALLOC_CHUNK);
mpeg2dec->sequence.width = (unsigned)-1;
mpeg2_reset (mpeg2dec, 1);
return mpeg2dec;
}
void mpeg2_close (mpeg2dec_t * mpeg2dec)
{
mpeg2_header_state_init (mpeg2dec);
mpeg2_free (mpeg2dec->chunk_buffer);
mpeg2_free (mpeg2dec);
}
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