mirror of https://git.ffmpeg.org/ffmpeg.git
400 lines
14 KiB
C
400 lines
14 KiB
C
/*
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* FLI/FLC Animation Video Decoder
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* Copyright (C) 2003, 2004 the ffmpeg project
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*
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* This library 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 of the License, or (at your option) any later version.
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*
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* This library 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 this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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/**
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* @file flic.c
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* Autodesk Animator FLI/FLC Video Decoder
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* by Mike Melanson (melanson@pcisys.net)
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* for more information on the .fli/.flc file format and all of its many
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* variations, visit:
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* http://www.compuphase.com/flic.htm
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*
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* This decoder outputs PAL8 colorspace data. To use this decoder, be
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* sure that your demuxer sends the FLI file header to the decoder via
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* the extradata chunk in AVCodecContext. The chunk should be 128 bytes
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* large. The only exception is for FLI files from the game "Magic Carpet",
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* in which the header is only 12 bytes.
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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 <unistd.h>
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#include "common.h"
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#include "avcodec.h"
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#include "bswap.h"
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#define FLI_256_COLOR 4
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#define FLI_DELTA 7
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#define FLI_COLOR 11
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#define FLI_LC 12
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#define FLI_BLACK 13
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#define FLI_BRUN 15
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#define FLI_COPY 16
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#define FLI_MINI 18
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#define LE_16(x) ((((uint8_t*)(x))[1] << 8) | ((uint8_t*)(x))[0])
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#define LE_32(x) ((((uint8_t*)(x))[3] << 24) | \
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(((uint8_t*)(x))[2] << 16) | \
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(((uint8_t*)(x))[1] << 8) | \
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((uint8_t*)(x))[0])
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typedef struct FlicDecodeContext {
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AVCodecContext *avctx;
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AVFrame frame;
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unsigned int palette[256];
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int new_palette;
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int fli_type; /* either 0xAF11 or 0xAF12, affects palette resolution */
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} FlicDecodeContext;
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static int flic_decode_init(AVCodecContext *avctx)
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{
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FlicDecodeContext *s = (FlicDecodeContext *)avctx->priv_data;
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unsigned char *fli_header = (unsigned char *)avctx->extradata;
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s->avctx = avctx;
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avctx->pix_fmt = PIX_FMT_PAL8;
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avctx->has_b_frames = 0;
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if (s->avctx->extradata_size == 12) {
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/* special case for magic carpet FLIs */
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s->fli_type = 0xAF13;
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} else if (s->avctx->extradata_size == 128) {
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s->fli_type = LE_16(&fli_header[4]);
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} else {
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av_log(avctx, AV_LOG_ERROR, "Expected extradata of 12 or 128 bytes\n");
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return -1;
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}
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s->frame.data[0] = NULL;
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s->new_palette = 0;
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return 0;
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}
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static int flic_decode_frame(AVCodecContext *avctx,
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void *data, int *data_size,
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uint8_t *buf, int buf_size)
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{
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FlicDecodeContext *s = (FlicDecodeContext *)avctx->priv_data;
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int stream_ptr = 0;
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int stream_ptr_after_color_chunk;
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int pixel_ptr;
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int palette_ptr;
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unsigned char palette_idx1;
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unsigned char palette_idx2;
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unsigned int frame_size;
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int num_chunks;
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unsigned int chunk_size;
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int chunk_type;
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int i, j;
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int color_packets;
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int color_changes;
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int color_shift;
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unsigned char r, g, b;
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int lines;
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int compressed_lines;
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int starting_line;
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signed short line_packets;
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int y_ptr;
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signed char byte_run;
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int pixel_skip;
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int pixel_countdown;
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unsigned char *pixels;
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s->frame.reference = 1;
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s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
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if (avctx->reget_buffer(avctx, &s->frame) < 0) {
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av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
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return -1;
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}
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pixels = s->frame.data[0];
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frame_size = LE_32(&buf[stream_ptr]);
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stream_ptr += 6; /* skip the magic number */
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num_chunks = LE_16(&buf[stream_ptr]);
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stream_ptr += 10; /* skip padding */
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frame_size -= 16;
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/* iterate through the chunks */
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while ((frame_size > 0) && (num_chunks > 0)) {
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chunk_size = LE_32(&buf[stream_ptr]);
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stream_ptr += 4;
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chunk_type = LE_16(&buf[stream_ptr]);
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stream_ptr += 2;
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switch (chunk_type) {
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case FLI_256_COLOR:
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case FLI_COLOR:
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stream_ptr_after_color_chunk = stream_ptr + chunk_size - 6;
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s->new_palette = 1;
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/* check special case: If this file is from the Magic Carpet
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* game and uses 6-bit colors even though it reports 256-color
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* chunks in a 0xAF12-type file (fli_type is set to 0xAF13 during
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* initialization) */
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if ((chunk_type == FLI_256_COLOR) && (s->fli_type != 0xAF13))
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color_shift = 0;
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else
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color_shift = 2;
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/* set up the palette */
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color_packets = LE_16(&buf[stream_ptr]);
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stream_ptr += 2;
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palette_ptr = 0;
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for (i = 0; i < color_packets; i++) {
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/* first byte is how many colors to skip */
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palette_ptr += buf[stream_ptr++];
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/* next byte indicates how many entries to change */
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color_changes = buf[stream_ptr++];
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/* if there are 0 color changes, there are actually 256 */
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if (color_changes == 0)
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color_changes = 256;
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for (j = 0; j < color_changes; j++) {
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/* wrap around, for good measure */
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if (palette_ptr >= 256)
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palette_ptr = 0;
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r = buf[stream_ptr++] << color_shift;
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g = buf[stream_ptr++] << color_shift;
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b = buf[stream_ptr++] << color_shift;
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s->palette[palette_ptr++] = (r << 16) | (g << 8) | b;
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}
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}
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/* color chunks sometimes have weird 16-bit alignment issues;
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* therefore, take the hardline approach and set the stream_ptr
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* to the value calculated w.r.t. the size specified by the color
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* chunk header */
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stream_ptr = stream_ptr_after_color_chunk;
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break;
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case FLI_DELTA:
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y_ptr = 0;
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compressed_lines = LE_16(&buf[stream_ptr]);
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stream_ptr += 2;
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while (compressed_lines > 0) {
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line_packets = LE_16(&buf[stream_ptr]);
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stream_ptr += 2;
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if (line_packets < 0) {
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line_packets = -line_packets;
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y_ptr += line_packets * s->frame.linesize[0];
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} else {
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compressed_lines--;
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pixel_ptr = y_ptr;
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pixel_countdown = s->avctx->width;
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for (i = 0; i < line_packets; i++) {
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/* account for the skip bytes */
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pixel_skip = buf[stream_ptr++];
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pixel_ptr += pixel_skip;
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pixel_countdown -= pixel_skip;
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byte_run = buf[stream_ptr++];
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if (byte_run < 0) {
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byte_run = -byte_run;
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palette_idx1 = buf[stream_ptr++];
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palette_idx2 = buf[stream_ptr++];
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for (j = 0; j < byte_run; j++, pixel_countdown -= 2) {
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pixels[pixel_ptr++] = palette_idx1;
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pixels[pixel_ptr++] = palette_idx2;
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}
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} else {
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for (j = 0; j < byte_run * 2; j++, pixel_countdown--) {
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palette_idx1 = buf[stream_ptr++];
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pixels[pixel_ptr++] = palette_idx1;
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}
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}
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}
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y_ptr += s->frame.linesize[0];
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}
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}
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break;
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case FLI_LC:
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/* line compressed */
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starting_line = LE_16(&buf[stream_ptr]);
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stream_ptr += 2;
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y_ptr = 0;
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y_ptr += starting_line * s->frame.linesize[0];
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compressed_lines = LE_16(&buf[stream_ptr]);
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stream_ptr += 2;
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while (compressed_lines > 0) {
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pixel_ptr = y_ptr;
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pixel_countdown = s->avctx->width;
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line_packets = buf[stream_ptr++];
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if (line_packets > 0) {
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for (i = 0; i < line_packets; i++) {
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/* account for the skip bytes */
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pixel_skip = buf[stream_ptr++];
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pixel_ptr += pixel_skip;
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pixel_countdown -= pixel_skip;
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byte_run = buf[stream_ptr++];
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if (byte_run > 0) {
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for (j = 0; j < byte_run; j++, pixel_countdown--) {
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palette_idx1 = buf[stream_ptr++];
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pixels[pixel_ptr++] = palette_idx1;
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}
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} else {
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byte_run = -byte_run;
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palette_idx1 = buf[stream_ptr++];
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for (j = 0; j < byte_run; j++, pixel_countdown--) {
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pixels[pixel_ptr++] = palette_idx1;
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}
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}
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}
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}
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y_ptr += s->frame.linesize[0];
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compressed_lines--;
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}
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break;
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case FLI_BLACK:
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/* set the whole frame to color 0 (which is usually black) */
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memset(pixels, 0,
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s->frame.linesize[0] * s->avctx->height);
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break;
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case FLI_BRUN:
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/* Byte run compression: This chunk type only occurs in the first
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* FLI frame and it will update the entire frame. */
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y_ptr = 0;
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for (lines = 0; lines < s->avctx->height; lines++) {
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pixel_ptr = y_ptr;
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/* disregard the line packets; instead, iterate through all
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* pixels on a row */
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stream_ptr++;
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pixel_countdown = s->avctx->width;
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while (pixel_countdown > 0) {
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byte_run = buf[stream_ptr++];
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if (byte_run > 0) {
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palette_idx1 = buf[stream_ptr++];
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for (j = 0; j < byte_run; j++) {
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pixels[pixel_ptr++] = palette_idx1;
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pixel_countdown--;
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if (pixel_countdown < 0)
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av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
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pixel_countdown);
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}
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} else { /* copy bytes if byte_run < 0 */
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byte_run = -byte_run;
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for (j = 0; j < byte_run; j++) {
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palette_idx1 = buf[stream_ptr++];
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pixels[pixel_ptr++] = palette_idx1;
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pixel_countdown--;
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if (pixel_countdown < 0)
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av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
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pixel_countdown);
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}
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}
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}
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y_ptr += s->frame.linesize[0];
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}
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break;
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case FLI_COPY:
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/* copy the chunk (uncompressed frame) */
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if (chunk_size - 6 > s->avctx->width * s->avctx->height) {
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av_log(avctx, AV_LOG_ERROR, "In chunk FLI_COPY : source data (%d bytes) " \
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"bigger than image, skipping chunk\n", chunk_size - 6);
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stream_ptr += chunk_size - 6;
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} else {
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for (y_ptr = 0; y_ptr < s->frame.linesize[0] * s->avctx->height;
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y_ptr += s->frame.linesize[0]) {
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memcpy(&pixels[y_ptr], &buf[stream_ptr],
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s->avctx->width);
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stream_ptr += s->avctx->width;
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}
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}
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break;
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case FLI_MINI:
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/* some sort of a thumbnail? disregard this chunk... */
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stream_ptr += chunk_size - 6;
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break;
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default:
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av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type);
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break;
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}
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frame_size -= chunk_size;
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num_chunks--;
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}
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/* by the end of the chunk, the stream ptr should equal the frame
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* size (minus 1, possibly); if it doesn't, issue a warning */
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if ((stream_ptr != buf_size) && (stream_ptr != buf_size - 1))
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av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \
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"and final chunk ptr = %d\n", buf_size, stream_ptr);
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/* make the palette available on the way out */
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// if (s->new_palette) {
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if (1) {
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memcpy(s->frame.data[1], s->palette, AVPALETTE_SIZE);
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s->frame.palette_has_changed = 1;
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s->new_palette = 0;
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}
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*data_size=sizeof(AVFrame);
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*(AVFrame*)data = s->frame;
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return buf_size;
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}
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static int flic_decode_end(AVCodecContext *avctx)
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{
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FlicDecodeContext *s = avctx->priv_data;
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if (s->frame.data[0])
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avctx->release_buffer(avctx, &s->frame);
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return 0;
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}
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AVCodec flic_decoder = {
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"flic",
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CODEC_TYPE_VIDEO,
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CODEC_ID_FLIC,
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sizeof(FlicDecodeContext),
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flic_decode_init,
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NULL,
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flic_decode_end,
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flic_decode_frame,
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CODEC_CAP_DR1,
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NULL
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};
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