mirror of https://git.ffmpeg.org/ffmpeg.git
496 lines
16 KiB
C
496 lines
16 KiB
C
/*
|
|
* Quicktime Graphics (SMC) Video Decoder
|
|
* Copyright (C) 2003 the ffmpeg project
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* This library 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
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*
|
|
*/
|
|
|
|
/**
|
|
* @file smc.c
|
|
* QT SMC Video Decoder by Mike Melanson (melanson@pcisys.net)
|
|
* For more information about the SMC format, visit:
|
|
* http://www.pcisys.net/~melanson/codecs/
|
|
*
|
|
* The SMC decoder outputs PAL8 colorspace data.
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
#include "common.h"
|
|
#include "avcodec.h"
|
|
#include "dsputil.h"
|
|
|
|
#define CPAIR 2
|
|
#define CQUAD 4
|
|
#define COCTET 8
|
|
|
|
#define COLORS_PER_TABLE 256
|
|
|
|
typedef struct SmcContext {
|
|
|
|
AVCodecContext *avctx;
|
|
DSPContext dsp;
|
|
AVFrame frame;
|
|
|
|
unsigned char *buf;
|
|
int size;
|
|
|
|
/* SMC color tables */
|
|
unsigned char color_pairs[COLORS_PER_TABLE * CPAIR];
|
|
unsigned char color_quads[COLORS_PER_TABLE * CQUAD];
|
|
unsigned char color_octets[COLORS_PER_TABLE * COCTET];
|
|
|
|
} SmcContext;
|
|
|
|
#define GET_BLOCK_COUNT() \
|
|
(opcode & 0x10) ? (1 + s->buf[stream_ptr++]) : 1 + (opcode & 0x0F);
|
|
|
|
#define ADVANCE_BLOCK() \
|
|
{ \
|
|
pixel_ptr += 4; \
|
|
if (pixel_ptr >= width) \
|
|
{ \
|
|
pixel_ptr = 0; \
|
|
row_ptr += stride * 4; \
|
|
} \
|
|
total_blocks--; \
|
|
if (total_blocks < 0) \
|
|
{ \
|
|
av_log(s->avctx, AV_LOG_INFO, "warning: block counter just went negative (this should not happen)\n"); \
|
|
return; \
|
|
} \
|
|
}
|
|
|
|
static void smc_decode_stream(SmcContext *s)
|
|
{
|
|
int width = s->avctx->width;
|
|
int height = s->avctx->height;
|
|
int stride = s->frame.linesize[0];
|
|
int i;
|
|
int stream_ptr = 0;
|
|
int chunk_size;
|
|
unsigned char opcode;
|
|
int n_blocks;
|
|
unsigned int color_flags;
|
|
unsigned int color_flags_a;
|
|
unsigned int color_flags_b;
|
|
unsigned int flag_mask;
|
|
|
|
unsigned char *pixels = s->frame.data[0];
|
|
|
|
int image_size = height * s->frame.linesize[0];
|
|
int row_ptr = 0;
|
|
int pixel_ptr = 0;
|
|
int pixel_x, pixel_y;
|
|
int row_inc = stride - 4;
|
|
int block_ptr;
|
|
int prev_block_ptr;
|
|
int prev_block_ptr1, prev_block_ptr2;
|
|
int prev_block_flag;
|
|
int total_blocks;
|
|
int color_table_index; /* indexes to color pair, quad, or octet tables */
|
|
int pixel;
|
|
|
|
int color_pair_index = 0;
|
|
int color_quad_index = 0;
|
|
int color_octet_index = 0;
|
|
|
|
/* make the palette available */
|
|
memcpy(s->frame.data[1], s->avctx->palctrl->palette, AVPALETTE_SIZE);
|
|
if (s->avctx->palctrl->palette_changed) {
|
|
s->frame.palette_has_changed = 1;
|
|
s->avctx->palctrl->palette_changed = 0;
|
|
}
|
|
|
|
chunk_size = BE_32(&s->buf[stream_ptr]) & 0x00FFFFFF;
|
|
stream_ptr += 4;
|
|
if (chunk_size != s->size)
|
|
av_log(s->avctx, AV_LOG_INFO, "warning: MOV chunk size != encoded chunk size (%d != %d); using MOV chunk size\n",
|
|
chunk_size, s->size);
|
|
|
|
chunk_size = s->size;
|
|
total_blocks = ((s->avctx->width + 3) / 4) * ((s->avctx->height + 3) / 4);
|
|
|
|
/* traverse through the blocks */
|
|
while (total_blocks) {
|
|
/* sanity checks */
|
|
/* make sure stream ptr hasn't gone out of bounds */
|
|
if (stream_ptr > chunk_size) {
|
|
av_log(s->avctx, AV_LOG_INFO, "SMC decoder just went out of bounds (stream ptr = %d, chunk size = %d)\n",
|
|
stream_ptr, chunk_size);
|
|
return;
|
|
}
|
|
/* make sure the row pointer hasn't gone wild */
|
|
if (row_ptr >= image_size) {
|
|
av_log(s->avctx, AV_LOG_INFO, "SMC decoder just went out of bounds (row ptr = %d, height = %d)\n",
|
|
row_ptr, image_size);
|
|
return;
|
|
}
|
|
|
|
opcode = s->buf[stream_ptr++];
|
|
switch (opcode & 0xF0) {
|
|
/* skip n blocks */
|
|
case 0x00:
|
|
case 0x10:
|
|
n_blocks = GET_BLOCK_COUNT();
|
|
while (n_blocks--) {
|
|
ADVANCE_BLOCK();
|
|
}
|
|
break;
|
|
|
|
/* repeat last block n times */
|
|
case 0x20:
|
|
case 0x30:
|
|
n_blocks = GET_BLOCK_COUNT();
|
|
|
|
/* sanity check */
|
|
if ((row_ptr == 0) && (pixel_ptr == 0)) {
|
|
av_log(s->avctx, AV_LOG_INFO, "encountered repeat block opcode (%02X) but no blocks rendered yet\n",
|
|
opcode & 0xF0);
|
|
break;
|
|
}
|
|
|
|
/* figure out where the previous block started */
|
|
if (pixel_ptr == 0)
|
|
prev_block_ptr1 =
|
|
(row_ptr - s->avctx->width * 4) + s->avctx->width - 4;
|
|
else
|
|
prev_block_ptr1 = row_ptr + pixel_ptr - 4;
|
|
|
|
while (n_blocks--) {
|
|
block_ptr = row_ptr + pixel_ptr;
|
|
prev_block_ptr = prev_block_ptr1;
|
|
for (pixel_y = 0; pixel_y < 4; pixel_y++) {
|
|
for (pixel_x = 0; pixel_x < 4; pixel_x++) {
|
|
pixels[block_ptr++] = pixels[prev_block_ptr++];
|
|
}
|
|
block_ptr += row_inc;
|
|
prev_block_ptr += row_inc;
|
|
}
|
|
ADVANCE_BLOCK();
|
|
}
|
|
break;
|
|
|
|
/* repeat previous pair of blocks n times */
|
|
case 0x40:
|
|
case 0x50:
|
|
n_blocks = GET_BLOCK_COUNT();
|
|
n_blocks *= 2;
|
|
|
|
/* sanity check */
|
|
if ((row_ptr == 0) && (pixel_ptr < 2 * 4)) {
|
|
av_log(s->avctx, AV_LOG_INFO, "encountered repeat block opcode (%02X) but not enough blocks rendered yet\n",
|
|
opcode & 0xF0);
|
|
break;
|
|
}
|
|
|
|
/* figure out where the previous 2 blocks started */
|
|
if (pixel_ptr == 0)
|
|
prev_block_ptr1 = (row_ptr - s->avctx->width * 4) +
|
|
s->avctx->width - 4 * 2;
|
|
else if (pixel_ptr == 4)
|
|
prev_block_ptr1 = (row_ptr - s->avctx->width * 4) + row_inc;
|
|
else
|
|
prev_block_ptr1 = row_ptr + pixel_ptr - 4 * 2;
|
|
|
|
if (pixel_ptr == 0)
|
|
prev_block_ptr2 = (row_ptr - s->avctx->width * 4) + row_inc;
|
|
else
|
|
prev_block_ptr2 = row_ptr + pixel_ptr - 4;
|
|
|
|
prev_block_flag = 0;
|
|
while (n_blocks--) {
|
|
block_ptr = row_ptr + pixel_ptr;
|
|
if (prev_block_flag)
|
|
prev_block_ptr = prev_block_ptr2;
|
|
else
|
|
prev_block_ptr = prev_block_ptr1;
|
|
prev_block_flag = !prev_block_flag;
|
|
|
|
for (pixel_y = 0; pixel_y < 4; pixel_y++) {
|
|
for (pixel_x = 0; pixel_x < 4; pixel_x++) {
|
|
pixels[block_ptr++] = pixels[prev_block_ptr++];
|
|
}
|
|
block_ptr += row_inc;
|
|
prev_block_ptr += row_inc;
|
|
}
|
|
ADVANCE_BLOCK();
|
|
}
|
|
break;
|
|
|
|
/* 1-color block encoding */
|
|
case 0x60:
|
|
case 0x70:
|
|
n_blocks = GET_BLOCK_COUNT();
|
|
pixel = s->buf[stream_ptr++];
|
|
|
|
while (n_blocks--) {
|
|
block_ptr = row_ptr + pixel_ptr;
|
|
for (pixel_y = 0; pixel_y < 4; pixel_y++) {
|
|
for (pixel_x = 0; pixel_x < 4; pixel_x++) {
|
|
pixels[block_ptr++] = pixel;
|
|
}
|
|
block_ptr += row_inc;
|
|
}
|
|
ADVANCE_BLOCK();
|
|
}
|
|
break;
|
|
|
|
/* 2-color block encoding */
|
|
case 0x80:
|
|
case 0x90:
|
|
n_blocks = (opcode & 0x0F) + 1;
|
|
|
|
/* figure out which color pair to use to paint the 2-color block */
|
|
if ((opcode & 0xF0) == 0x80) {
|
|
/* fetch the next 2 colors from bytestream and store in next
|
|
* available entry in the color pair table */
|
|
for (i = 0; i < CPAIR; i++) {
|
|
pixel = s->buf[stream_ptr++];
|
|
color_table_index = CPAIR * color_pair_index + i;
|
|
s->color_pairs[color_table_index] = pixel;
|
|
}
|
|
/* this is the base index to use for this block */
|
|
color_table_index = CPAIR * color_pair_index;
|
|
color_pair_index++;
|
|
/* wraparound */
|
|
if (color_pair_index == COLORS_PER_TABLE)
|
|
color_pair_index = 0;
|
|
} else
|
|
color_table_index = CPAIR * s->buf[stream_ptr++];
|
|
|
|
while (n_blocks--) {
|
|
color_flags = BE_16(&s->buf[stream_ptr]);
|
|
stream_ptr += 2;
|
|
flag_mask = 0x8000;
|
|
block_ptr = row_ptr + pixel_ptr;
|
|
for (pixel_y = 0; pixel_y < 4; pixel_y++) {
|
|
for (pixel_x = 0; pixel_x < 4; pixel_x++) {
|
|
if (color_flags & flag_mask)
|
|
pixel = color_table_index + 1;
|
|
else
|
|
pixel = color_table_index;
|
|
flag_mask >>= 1;
|
|
pixels[block_ptr++] = s->color_pairs[pixel];
|
|
}
|
|
block_ptr += row_inc;
|
|
}
|
|
ADVANCE_BLOCK();
|
|
}
|
|
break;
|
|
|
|
/* 4-color block encoding */
|
|
case 0xA0:
|
|
case 0xB0:
|
|
n_blocks = (opcode & 0x0F) + 1;
|
|
|
|
/* figure out which color quad to use to paint the 4-color block */
|
|
if ((opcode & 0xF0) == 0xA0) {
|
|
/* fetch the next 4 colors from bytestream and store in next
|
|
* available entry in the color quad table */
|
|
for (i = 0; i < CQUAD; i++) {
|
|
pixel = s->buf[stream_ptr++];
|
|
color_table_index = CQUAD * color_quad_index + i;
|
|
s->color_quads[color_table_index] = pixel;
|
|
}
|
|
/* this is the base index to use for this block */
|
|
color_table_index = CQUAD * color_quad_index;
|
|
color_quad_index++;
|
|
/* wraparound */
|
|
if (color_quad_index == COLORS_PER_TABLE)
|
|
color_quad_index = 0;
|
|
} else
|
|
color_table_index = CQUAD * s->buf[stream_ptr++];
|
|
|
|
while (n_blocks--) {
|
|
color_flags = BE_32(&s->buf[stream_ptr]);
|
|
stream_ptr += 4;
|
|
/* flag mask actually acts as a bit shift count here */
|
|
flag_mask = 30;
|
|
block_ptr = row_ptr + pixel_ptr;
|
|
for (pixel_y = 0; pixel_y < 4; pixel_y++) {
|
|
for (pixel_x = 0; pixel_x < 4; pixel_x++) {
|
|
pixel = color_table_index +
|
|
((color_flags >> flag_mask) & 0x03);
|
|
flag_mask -= 2;
|
|
pixels[block_ptr++] = s->color_quads[pixel];
|
|
}
|
|
block_ptr += row_inc;
|
|
}
|
|
ADVANCE_BLOCK();
|
|
}
|
|
break;
|
|
|
|
/* 8-color block encoding */
|
|
case 0xC0:
|
|
case 0xD0:
|
|
n_blocks = (opcode & 0x0F) + 1;
|
|
|
|
/* figure out which color octet to use to paint the 8-color block */
|
|
if ((opcode & 0xF0) == 0xC0) {
|
|
/* fetch the next 8 colors from bytestream and store in next
|
|
* available entry in the color octet table */
|
|
for (i = 0; i < COCTET; i++) {
|
|
pixel = s->buf[stream_ptr++];
|
|
color_table_index = COCTET * color_octet_index + i;
|
|
s->color_octets[color_table_index] = pixel;
|
|
}
|
|
/* this is the base index to use for this block */
|
|
color_table_index = COCTET * color_octet_index;
|
|
color_octet_index++;
|
|
/* wraparound */
|
|
if (color_octet_index == COLORS_PER_TABLE)
|
|
color_octet_index = 0;
|
|
} else
|
|
color_table_index = COCTET * s->buf[stream_ptr++];
|
|
|
|
while (n_blocks--) {
|
|
/*
|
|
For this input of 6 hex bytes:
|
|
01 23 45 67 89 AB
|
|
Mangle it to this output:
|
|
flags_a = xx012456, flags_b = xx89A37B
|
|
*/
|
|
/* build the color flags */
|
|
color_flags_a = color_flags_b = 0;
|
|
color_flags_a =
|
|
(s->buf[stream_ptr + 0] << 16) |
|
|
((s->buf[stream_ptr + 1] & 0xF0) << 8) |
|
|
((s->buf[stream_ptr + 2] & 0xF0) << 4) |
|
|
((s->buf[stream_ptr + 2] & 0x0F) << 4) |
|
|
((s->buf[stream_ptr + 3] & 0xF0) >> 4);
|
|
color_flags_b =
|
|
(s->buf[stream_ptr + 4] << 16) |
|
|
((s->buf[stream_ptr + 5] & 0xF0) << 8) |
|
|
((s->buf[stream_ptr + 1] & 0x0F) << 8) |
|
|
((s->buf[stream_ptr + 3] & 0x0F) << 4) |
|
|
(s->buf[stream_ptr + 5] & 0x0F);
|
|
stream_ptr += 6;
|
|
|
|
color_flags = color_flags_a;
|
|
/* flag mask actually acts as a bit shift count here */
|
|
flag_mask = 21;
|
|
block_ptr = row_ptr + pixel_ptr;
|
|
for (pixel_y = 0; pixel_y < 4; pixel_y++) {
|
|
/* reload flags at third row (iteration pixel_y == 2) */
|
|
if (pixel_y == 2) {
|
|
color_flags = color_flags_b;
|
|
flag_mask = 21;
|
|
}
|
|
for (pixel_x = 0; pixel_x < 4; pixel_x++) {
|
|
pixel = color_table_index +
|
|
((color_flags >> flag_mask) & 0x07);
|
|
flag_mask -= 3;
|
|
pixels[block_ptr++] = s->color_octets[pixel];
|
|
}
|
|
block_ptr += row_inc;
|
|
}
|
|
ADVANCE_BLOCK();
|
|
}
|
|
break;
|
|
|
|
/* 16-color block encoding (every pixel is a different color) */
|
|
case 0xE0:
|
|
n_blocks = (opcode & 0x0F) + 1;
|
|
|
|
while (n_blocks--) {
|
|
block_ptr = row_ptr + pixel_ptr;
|
|
for (pixel_y = 0; pixel_y < 4; pixel_y++) {
|
|
for (pixel_x = 0; pixel_x < 4; pixel_x++) {
|
|
pixels[block_ptr++] = s->buf[stream_ptr++];
|
|
}
|
|
block_ptr += row_inc;
|
|
}
|
|
ADVANCE_BLOCK();
|
|
}
|
|
break;
|
|
|
|
case 0xF0:
|
|
av_log(s->avctx, AV_LOG_INFO, "0xF0 opcode seen in SMC chunk (contact the developers)\n");
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int smc_decode_init(AVCodecContext *avctx)
|
|
{
|
|
SmcContext *s = (SmcContext *)avctx->priv_data;
|
|
|
|
s->avctx = avctx;
|
|
avctx->pix_fmt = PIX_FMT_PAL8;
|
|
avctx->has_b_frames = 0;
|
|
dsputil_init(&s->dsp, avctx);
|
|
|
|
s->frame.data[0] = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int smc_decode_frame(AVCodecContext *avctx,
|
|
void *data, int *data_size,
|
|
uint8_t *buf, int buf_size)
|
|
{
|
|
SmcContext *s = (SmcContext *)avctx->priv_data;
|
|
|
|
/* no supplementary picture */
|
|
if (buf_size == 0)
|
|
return 0;
|
|
|
|
s->buf = buf;
|
|
s->size = buf_size;
|
|
|
|
s->frame.reference = 1;
|
|
s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE |
|
|
FF_BUFFER_HINTS_REUSABLE | FF_BUFFER_HINTS_READABLE;
|
|
if (avctx->reget_buffer(avctx, &s->frame)) {
|
|
av_log(s->avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
|
|
return -1;
|
|
}
|
|
|
|
smc_decode_stream(s);
|
|
|
|
*data_size = sizeof(AVFrame);
|
|
*(AVFrame*)data = s->frame;
|
|
|
|
/* always report that the buffer was completely consumed */
|
|
return buf_size;
|
|
}
|
|
|
|
static int smc_decode_end(AVCodecContext *avctx)
|
|
{
|
|
SmcContext *s = (SmcContext *)avctx->priv_data;
|
|
|
|
if (s->frame.data[0])
|
|
avctx->release_buffer(avctx, &s->frame);
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVCodec smc_decoder = {
|
|
"smc",
|
|
CODEC_TYPE_VIDEO,
|
|
CODEC_ID_SMC,
|
|
sizeof(SmcContext),
|
|
smc_decode_init,
|
|
NULL,
|
|
smc_decode_end,
|
|
smc_decode_frame,
|
|
CODEC_CAP_DR1,
|
|
};
|