summaryrefslogtreecommitdiff
path: root/src/libffmpeg/libavcodec/smc.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/libffmpeg/libavcodec/smc.c')
-rw-r--r--src/libffmpeg/libavcodec/smc.c493
1 files changed, 0 insertions, 493 deletions
diff --git a/src/libffmpeg/libavcodec/smc.c b/src/libffmpeg/libavcodec/smc.c
deleted file mode 100644
index 349e5f81c..000000000
--- a/src/libffmpeg/libavcodec/smc.c
+++ /dev/null
@@ -1,493 +0,0 @@
-/*
- * Quicktime Graphics (SMC) Video Decoder
- * Copyright (C) 2003 the ffmpeg project
- *
- * This file is part of FFmpeg.
- *
- * FFmpeg 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 2.1 of the License, or (at your option) any later version.
- *
- * FFmpeg 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 FFmpeg; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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 = AV_RB32(&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 = AV_RB16(&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 = AV_RB32(&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;
-
- 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,
-};
generated by cgit v1.2.3 (git 2.25.1) at 2025-04-25 14:00:03 +0000