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/* |
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* Quicktime Graphics (SMC) Video Decoder |
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* Copyright (C) 2003 The FFmpeg project |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/** |
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* @file |
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* QT SMC Video Decoder by Mike Melanson (melanson@pcisys.net) |
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* For more information about the SMC format, visit: |
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* http://www.pcisys.net/~melanson/codecs/ |
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* |
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* The SMC decoder outputs PAL8 colorspace data. |
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*/ |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include "libavutil/intreadwrite.h" |
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#include "avcodec.h" |
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#include "bytestream.h" |
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#include "decode.h" |
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#include "internal.h" |
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#define CPAIR 2 |
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#define CQUAD 4 |
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#define COCTET 8 |
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#define COLORS_PER_TABLE 256 |
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typedef struct SmcContext { |
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AVCodecContext *avctx; |
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AVFrame *frame; |
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GetByteContext gb; |
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/* SMC color tables */ |
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unsigned char color_pairs[COLORS_PER_TABLE * CPAIR]; |
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unsigned char color_quads[COLORS_PER_TABLE * CQUAD]; |
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unsigned char color_octets[COLORS_PER_TABLE * COCTET]; |
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uint32_t pal[256]; |
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} SmcContext; |
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#define GET_BLOCK_COUNT() \ |
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(opcode & 0x10) ? (1 + bytestream2_get_byte(&s->gb)) : 1 + (opcode & 0x0F); |
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#define ADVANCE_BLOCK() \ |
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{ \ |
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pixel_ptr += 4; \ |
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if (pixel_ptr >= width) \ |
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{ \ |
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pixel_ptr = 0; \ |
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row_ptr += stride * 4; \ |
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} \ |
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total_blocks--; \ |
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if (total_blocks < !!n_blocks) \ |
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{ \ |
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av_log(s->avctx, AV_LOG_INFO, "warning: block counter just went negative (this should not happen)\n"); \ |
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return; \ |
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} \ |
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} |
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static void smc_decode_stream(SmcContext *s) |
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{ |
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int width = s->avctx->width; |
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int height = s->avctx->height; |
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int stride = s->frame->linesize[0]; |
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int i; |
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int chunk_size; |
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int buf_size = bytestream2_size(&s->gb); |
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unsigned char opcode; |
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int n_blocks; |
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unsigned int color_flags; |
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unsigned int color_flags_a; |
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unsigned int color_flags_b; |
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unsigned int flag_mask; |
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unsigned char * const pixels = s->frame->data[0]; |
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int image_size = height * s->frame->linesize[0]; |
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int row_ptr = 0; |
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int pixel_ptr = 0; |
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int pixel_x, pixel_y; |
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int row_inc = stride - 4; |
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int block_ptr; |
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int prev_block_ptr; |
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int prev_block_ptr1, prev_block_ptr2; |
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int prev_block_flag; |
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int total_blocks; |
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int color_table_index; /* indexes to color pair, quad, or octet tables */ |
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int pixel; |
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int color_pair_index = 0; |
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int color_quad_index = 0; |
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int color_octet_index = 0; |
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/* make the palette available */ |
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memcpy(s->frame->data[1], s->pal, AVPALETTE_SIZE); |
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bytestream2_skip(&s->gb, 1); |
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chunk_size = bytestream2_get_be24(&s->gb); |
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✗✓ |
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if (chunk_size != buf_size) |
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av_log(s->avctx, AV_LOG_INFO, "warning: MOV chunk size != encoded chunk size (%d != %d); using MOV chunk size\n", |
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chunk_size, buf_size); |
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chunk_size = buf_size; |
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total_blocks = ((s->avctx->width + 3) / 4) * ((s->avctx->height + 3) / 4); |
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/* traverse through the blocks */ |
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while (total_blocks) { |
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/* sanity checks */ |
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/* make sure the row pointer hasn't gone wild */ |
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✗✓ |
130697 |
if (row_ptr >= image_size) { |
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av_log(s->avctx, AV_LOG_INFO, "SMC decoder just went out of bounds (row ptr = %d, height = %d)\n", |
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row_ptr, image_size); |
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return; |
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} |
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✗✓ |
130697 |
if (bytestream2_get_bytes_left(&s->gb) < 1) { |
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av_log(s->avctx, AV_LOG_ERROR, "input too small\n"); |
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return; |
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} |
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130697 |
opcode = bytestream2_get_byte(&s->gb); |
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✓✓✗✓ ✓✓✓✓ ✗✗ |
130697 |
switch (opcode & 0xF0) { |
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/* skip n blocks */ |
144 |
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28630 |
case 0x00: |
145 |
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case 0x10: |
146 |
✓✓ |
28630 |
n_blocks = GET_BLOCK_COUNT(); |
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✓✓ |
447015 |
while (n_blocks--) { |
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✓✓✗✓
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418385 |
ADVANCE_BLOCK(); |
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} |
150 |
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28630 |
break; |
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152 |
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/* repeat last block n times */ |
153 |
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1068 |
case 0x20: |
154 |
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case 0x30: |
155 |
✓✓ |
1068 |
n_blocks = GET_BLOCK_COUNT(); |
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157 |
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/* sanity check */ |
158 |
✗✓✗✗
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1068 |
if ((row_ptr == 0) && (pixel_ptr == 0)) { |
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av_log(s->avctx, AV_LOG_INFO, "encountered repeat block opcode (%02X) but no blocks rendered yet\n", |
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opcode & 0xF0); |
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return; |
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} |
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/* figure out where the previous block started */ |
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✗✓ |
1068 |
if (pixel_ptr == 0) |
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prev_block_ptr1 = |
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(row_ptr - s->avctx->width * 4) + s->avctx->width - 4; |
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else |
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1068 |
prev_block_ptr1 = row_ptr + pixel_ptr - 4; |
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✓✓ |
3393 |
while (n_blocks--) { |
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2325 |
block_ptr = row_ptr + pixel_ptr; |
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2325 |
prev_block_ptr = prev_block_ptr1; |
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✓✓ |
11625 |
for (pixel_y = 0; pixel_y < 4; pixel_y++) { |
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✓✓ |
46500 |
for (pixel_x = 0; pixel_x < 4; pixel_x++) { |
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37200 |
pixels[block_ptr++] = pixels[prev_block_ptr++]; |
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} |
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9300 |
block_ptr += row_inc; |
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9300 |
prev_block_ptr += row_inc; |
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} |
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✓✓✗✓
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2325 |
ADVANCE_BLOCK(); |
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} |
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1068 |
break; |
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185 |
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/* repeat previous pair of blocks n times */ |
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case 0x40: |
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case 0x50: |
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n_blocks = GET_BLOCK_COUNT(); |
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n_blocks *= 2; |
190 |
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/* sanity check */ |
192 |
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if ((row_ptr == 0) && (pixel_ptr < 2 * 4)) { |
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av_log(s->avctx, AV_LOG_INFO, "encountered repeat block opcode (%02X) but not enough blocks rendered yet\n", |
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opcode & 0xF0); |
195 |
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return; |
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} |
197 |
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198 |
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/* figure out where the previous 2 blocks started */ |
199 |
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if (pixel_ptr == 0) |
200 |
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prev_block_ptr1 = (row_ptr - s->avctx->width * 4) + |
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s->avctx->width - 4 * 2; |
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else if (pixel_ptr == 4) |
203 |
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prev_block_ptr1 = (row_ptr - s->avctx->width * 4) + row_inc; |
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else |
205 |
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prev_block_ptr1 = row_ptr + pixel_ptr - 4 * 2; |
206 |
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207 |
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if (pixel_ptr == 0) |
208 |
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prev_block_ptr2 = (row_ptr - s->avctx->width * 4) + row_inc; |
209 |
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else |
210 |
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prev_block_ptr2 = row_ptr + pixel_ptr - 4; |
211 |
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212 |
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prev_block_flag = 0; |
213 |
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while (n_blocks--) { |
214 |
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block_ptr = row_ptr + pixel_ptr; |
215 |
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if (prev_block_flag) |
216 |
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prev_block_ptr = prev_block_ptr2; |
217 |
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else |
218 |
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prev_block_ptr = prev_block_ptr1; |
219 |
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prev_block_flag = !prev_block_flag; |
220 |
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221 |
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for (pixel_y = 0; pixel_y < 4; pixel_y++) { |
222 |
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for (pixel_x = 0; pixel_x < 4; pixel_x++) { |
223 |
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pixels[block_ptr++] = pixels[prev_block_ptr++]; |
224 |
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} |
225 |
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block_ptr += row_inc; |
226 |
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prev_block_ptr += row_inc; |
227 |
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} |
228 |
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ADVANCE_BLOCK(); |
229 |
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} |
230 |
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break; |
231 |
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232 |
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/* 1-color block encoding */ |
233 |
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11688 |
case 0x60: |
234 |
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case 0x70: |
235 |
✓✓ |
11688 |
n_blocks = GET_BLOCK_COUNT(); |
236 |
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11688 |
pixel = bytestream2_get_byte(&s->gb); |
237 |
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238 |
✓✓ |
62105 |
while (n_blocks--) { |
239 |
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50417 |
block_ptr = row_ptr + pixel_ptr; |
240 |
✓✓ |
252085 |
for (pixel_y = 0; pixel_y < 4; pixel_y++) { |
241 |
✓✓ |
1008340 |
for (pixel_x = 0; pixel_x < 4; pixel_x++) { |
242 |
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806672 |
pixels[block_ptr++] = pixel; |
243 |
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} |
244 |
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201668 |
block_ptr += row_inc; |
245 |
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} |
246 |
✓✓✗✓
|
50417 |
ADVANCE_BLOCK(); |
247 |
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} |
248 |
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11688 |
break; |
249 |
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250 |
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/* 2-color block encoding */ |
251 |
|
17912 |
case 0x80: |
252 |
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case 0x90: |
253 |
|
17912 |
n_blocks = (opcode & 0x0F) + 1; |
254 |
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255 |
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/* figure out which color pair to use to paint the 2-color block */ |
256 |
✓✓ |
17912 |
if ((opcode & 0xF0) == 0x80) { |
257 |
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/* fetch the next 2 colors from bytestream and store in next |
258 |
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* available entry in the color pair table */ |
259 |
✓✓ |
15813 |
for (i = 0; i < CPAIR; i++) { |
260 |
|
10542 |
pixel = bytestream2_get_byte(&s->gb); |
261 |
|
10542 |
color_table_index = CPAIR * color_pair_index + i; |
262 |
|
10542 |
s->color_pairs[color_table_index] = pixel; |
263 |
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} |
264 |
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/* this is the base index to use for this block */ |
265 |
|
5271 |
color_table_index = CPAIR * color_pair_index; |
266 |
|
5271 |
color_pair_index++; |
267 |
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/* wraparound */ |
268 |
✗✓ |
5271 |
if (color_pair_index == COLORS_PER_TABLE) |
269 |
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color_pair_index = 0; |
270 |
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} else |
271 |
|
12641 |
color_table_index = CPAIR * bytestream2_get_byte(&s->gb); |
272 |
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|
273 |
✓✓ |
36856 |
while (n_blocks--) { |
274 |
|
18944 |
color_flags = bytestream2_get_be16(&s->gb); |
275 |
|
18944 |
flag_mask = 0x8000; |
276 |
|
18944 |
block_ptr = row_ptr + pixel_ptr; |
277 |
✓✓ |
94720 |
for (pixel_y = 0; pixel_y < 4; pixel_y++) { |
278 |
✓✓ |
378880 |
for (pixel_x = 0; pixel_x < 4; pixel_x++) { |
279 |
✓✓ |
303104 |
if (color_flags & flag_mask) |
280 |
|
121822 |
pixel = color_table_index + 1; |
281 |
|
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else |
282 |
|
181282 |
pixel = color_table_index; |
283 |
|
303104 |
flag_mask >>= 1; |
284 |
|
303104 |
pixels[block_ptr++] = s->color_pairs[pixel]; |
285 |
|
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} |
286 |
|
75776 |
block_ptr += row_inc; |
287 |
|
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} |
288 |
✓✓✗✓
|
18944 |
ADVANCE_BLOCK(); |
289 |
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} |
290 |
|
17912 |
break; |
291 |
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292 |
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/* 4-color block encoding */ |
293 |
|
35882 |
case 0xA0: |
294 |
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case 0xB0: |
295 |
|
35882 |
n_blocks = (opcode & 0x0F) + 1; |
296 |
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|
297 |
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/* figure out which color quad to use to paint the 4-color block */ |
298 |
✓✓ |
35882 |
if ((opcode & 0xF0) == 0xA0) { |
299 |
|
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/* fetch the next 4 colors from bytestream and store in next |
300 |
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* available entry in the color quad table */ |
301 |
✓✓ |
72670 |
for (i = 0; i < CQUAD; i++) { |
302 |
|
58136 |
pixel = bytestream2_get_byte(&s->gb); |
303 |
|
58136 |
color_table_index = CQUAD * color_quad_index + i; |
304 |
|
58136 |
s->color_quads[color_table_index] = pixel; |
305 |
|
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} |
306 |
|
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/* this is the base index to use for this block */ |
307 |
|
14534 |
color_table_index = CQUAD * color_quad_index; |
308 |
|
14534 |
color_quad_index++; |
309 |
|
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/* wraparound */ |
310 |
✗✓ |
14534 |
if (color_quad_index == COLORS_PER_TABLE) |
311 |
|
|
color_quad_index = 0; |
312 |
|
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} else |
313 |
|
21348 |
color_table_index = CQUAD * bytestream2_get_byte(&s->gb); |
314 |
|
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|
315 |
✓✓ |
77041 |
while (n_blocks--) { |
316 |
|
41159 |
color_flags = bytestream2_get_be32(&s->gb); |
317 |
|
|
/* flag mask actually acts as a bit shift count here */ |
318 |
|
41159 |
flag_mask = 30; |
319 |
|
41159 |
block_ptr = row_ptr + pixel_ptr; |
320 |
✓✓ |
205795 |
for (pixel_y = 0; pixel_y < 4; pixel_y++) { |
321 |
✓✓ |
823180 |
for (pixel_x = 0; pixel_x < 4; pixel_x++) { |
322 |
|
658544 |
pixel = color_table_index + |
323 |
|
658544 |
((color_flags >> flag_mask) & 0x03); |
324 |
|
658544 |
flag_mask -= 2; |
325 |
|
658544 |
pixels[block_ptr++] = s->color_quads[pixel]; |
326 |
|
|
} |
327 |
|
164636 |
block_ptr += row_inc; |
328 |
|
|
} |
329 |
✓✓✗✓
|
41159 |
ADVANCE_BLOCK(); |
330 |
|
|
} |
331 |
|
35882 |
break; |
332 |
|
|
|
333 |
|
|
/* 8-color block encoding */ |
334 |
|
33474 |
case 0xC0: |
335 |
|
|
case 0xD0: |
336 |
|
33474 |
n_blocks = (opcode & 0x0F) + 1; |
337 |
|
|
|
338 |
|
|
/* figure out which color octet to use to paint the 8-color block */ |
339 |
✓✓ |
33474 |
if ((opcode & 0xF0) == 0xC0) { |
340 |
|
|
/* fetch the next 8 colors from bytestream and store in next |
341 |
|
|
* available entry in the color octet table */ |
342 |
✓✓ |
98883 |
for (i = 0; i < COCTET; i++) { |
343 |
|
87896 |
pixel = bytestream2_get_byte(&s->gb); |
344 |
|
87896 |
color_table_index = COCTET * color_octet_index + i; |
345 |
|
87896 |
s->color_octets[color_table_index] = pixel; |
346 |
|
|
} |
347 |
|
|
/* this is the base index to use for this block */ |
348 |
|
10987 |
color_table_index = COCTET * color_octet_index; |
349 |
|
10987 |
color_octet_index++; |
350 |
|
|
/* wraparound */ |
351 |
✗✓ |
10987 |
if (color_octet_index == COLORS_PER_TABLE) |
352 |
|
|
color_octet_index = 0; |
353 |
|
|
} else |
354 |
|
22487 |
color_table_index = COCTET * bytestream2_get_byte(&s->gb); |
355 |
|
|
|
356 |
✓✓ |
76047 |
while (n_blocks--) { |
357 |
|
|
/* |
358 |
|
|
For this input of 6 hex bytes: |
359 |
|
|
01 23 45 67 89 AB |
360 |
|
|
Mangle it to this output: |
361 |
|
|
flags_a = xx012456, flags_b = xx89A37B |
362 |
|
|
*/ |
363 |
|
|
/* build the color flags */ |
364 |
|
42573 |
int val1 = bytestream2_get_be16(&s->gb); |
365 |
|
42573 |
int val2 = bytestream2_get_be16(&s->gb); |
366 |
|
42573 |
int val3 = bytestream2_get_be16(&s->gb); |
367 |
|
42573 |
color_flags_a = ((val1 & 0xFFF0) << 8) | (val2 >> 4); |
368 |
|
42573 |
color_flags_b = ((val3 & 0xFFF0) << 8) | |
369 |
|
42573 |
((val1 & 0x0F) << 8) | ((val2 & 0x0F) << 4) | (val3 & 0x0F); |
370 |
|
|
|
371 |
|
42573 |
color_flags = color_flags_a; |
372 |
|
|
/* flag mask actually acts as a bit shift count here */ |
373 |
|
42573 |
flag_mask = 21; |
374 |
|
42573 |
block_ptr = row_ptr + pixel_ptr; |
375 |
✓✓ |
212865 |
for (pixel_y = 0; pixel_y < 4; pixel_y++) { |
376 |
|
|
/* reload flags at third row (iteration pixel_y == 2) */ |
377 |
✓✓ |
170292 |
if (pixel_y == 2) { |
378 |
|
42573 |
color_flags = color_flags_b; |
379 |
|
42573 |
flag_mask = 21; |
380 |
|
|
} |
381 |
✓✓ |
851460 |
for (pixel_x = 0; pixel_x < 4; pixel_x++) { |
382 |
|
681168 |
pixel = color_table_index + |
383 |
|
681168 |
((color_flags >> flag_mask) & 0x07); |
384 |
|
681168 |
flag_mask -= 3; |
385 |
|
681168 |
pixels[block_ptr++] = s->color_octets[pixel]; |
386 |
|
|
} |
387 |
|
170292 |
block_ptr += row_inc; |
388 |
|
|
} |
389 |
✓✓✗✓
|
42573 |
ADVANCE_BLOCK(); |
390 |
|
|
} |
391 |
|
33474 |
break; |
392 |
|
|
|
393 |
|
|
/* 16-color block encoding (every pixel is a different color) */ |
394 |
|
2043 |
case 0xE0: |
395 |
|
2043 |
n_blocks = (opcode & 0x0F) + 1; |
396 |
|
|
|
397 |
✓✓ |
4240 |
while (n_blocks--) { |
398 |
|
2197 |
block_ptr = row_ptr + pixel_ptr; |
399 |
✓✓ |
10985 |
for (pixel_y = 0; pixel_y < 4; pixel_y++) { |
400 |
✓✓ |
43940 |
for (pixel_x = 0; pixel_x < 4; pixel_x++) { |
401 |
|
35152 |
pixels[block_ptr++] = bytestream2_get_byte(&s->gb); |
402 |
|
|
} |
403 |
|
8788 |
block_ptr += row_inc; |
404 |
|
|
} |
405 |
✗✓✗✓
|
2197 |
ADVANCE_BLOCK(); |
406 |
|
|
} |
407 |
|
2043 |
break; |
408 |
|
|
|
409 |
|
|
case 0xF0: |
410 |
|
|
avpriv_request_sample(s->avctx, "0xF0 opcode"); |
411 |
|
|
break; |
412 |
|
|
} |
413 |
✓✓ |
130817 |
} |
414 |
|
|
|
415 |
|
120 |
return; |
416 |
|
|
} |
417 |
|
|
|
418 |
|
2 |
static av_cold int smc_decode_init(AVCodecContext *avctx) |
419 |
|
|
{ |
420 |
|
2 |
SmcContext *s = avctx->priv_data; |
421 |
|
|
|
422 |
|
2 |
s->avctx = avctx; |
423 |
|
2 |
avctx->pix_fmt = AV_PIX_FMT_PAL8; |
424 |
|
|
|
425 |
|
2 |
s->frame = av_frame_alloc(); |
426 |
✗✓ |
2 |
if (!s->frame) |
427 |
|
|
return AVERROR(ENOMEM); |
428 |
|
|
|
429 |
|
2 |
return 0; |
430 |
|
|
} |
431 |
|
|
|
432 |
|
120 |
static int smc_decode_frame(AVCodecContext *avctx, |
433 |
|
|
void *data, int *got_frame, |
434 |
|
|
AVPacket *avpkt) |
435 |
|
|
{ |
436 |
|
120 |
const uint8_t *buf = avpkt->data; |
437 |
|
120 |
int buf_size = avpkt->size; |
438 |
|
120 |
SmcContext *s = avctx->priv_data; |
439 |
|
|
int ret; |
440 |
|
120 |
int total_blocks = ((s->avctx->width + 3) / 4) * ((s->avctx->height + 3) / 4); |
441 |
|
|
|
442 |
✗✓ |
120 |
if (total_blocks / 1024 > avpkt->size) |
443 |
|
|
return AVERROR_INVALIDDATA; |
444 |
|
|
|
445 |
|
120 |
bytestream2_init(&s->gb, buf, buf_size); |
446 |
|
|
|
447 |
✗✓ |
120 |
if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0) |
448 |
|
|
return ret; |
449 |
|
|
|
450 |
|
120 |
s->frame->palette_has_changed = ff_copy_palette(s->pal, avpkt, avctx); |
451 |
|
|
|
452 |
|
120 |
smc_decode_stream(s); |
453 |
|
|
|
454 |
|
120 |
*got_frame = 1; |
455 |
✗✓ |
120 |
if ((ret = av_frame_ref(data, s->frame)) < 0) |
456 |
|
|
return ret; |
457 |
|
|
|
458 |
|
|
/* always report that the buffer was completely consumed */ |
459 |
|
120 |
return buf_size; |
460 |
|
|
} |
461 |
|
|
|
462 |
|
2 |
static av_cold int smc_decode_end(AVCodecContext *avctx) |
463 |
|
|
{ |
464 |
|
2 |
SmcContext *s = avctx->priv_data; |
465 |
|
|
|
466 |
|
2 |
av_frame_free(&s->frame); |
467 |
|
|
|
468 |
|
2 |
return 0; |
469 |
|
|
} |
470 |
|
|
|
471 |
|
|
AVCodec ff_smc_decoder = { |
472 |
|
|
.name = "smc", |
473 |
|
|
.long_name = NULL_IF_CONFIG_SMALL("QuickTime Graphics (SMC)"), |
474 |
|
|
.type = AVMEDIA_TYPE_VIDEO, |
475 |
|
|
.id = AV_CODEC_ID_SMC, |
476 |
|
|
.priv_data_size = sizeof(SmcContext), |
477 |
|
|
.init = smc_decode_init, |
478 |
|
|
.close = smc_decode_end, |
479 |
|
|
.decode = smc_decode_frame, |
480 |
|
|
.capabilities = AV_CODEC_CAP_DR1, |
481 |
|
|
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, |
482 |
|
|
}; |