mirror of
https://github.com/FFmpeg/FFmpeg.git
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233 lines
6.3 KiB
C
233 lines
6.3 KiB
C
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/*
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* Tiertex Limited SEQ Video Decoder
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* Copyright (c) 2006 Gregory Montoir (cyx@users.sourceforge.net)
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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 tiertexseqv.c
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* Tiertex Limited SEQ video decoder
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*/
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#include "avcodec.h"
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#include "common.h"
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#define ALT_BITSTREAM_READER_LE
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#include "bitstream.h"
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typedef struct SeqVideoContext {
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AVCodecContext *avctx;
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AVFrame frame;
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unsigned int palette[256];
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unsigned char block[8 * 8];
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} SeqVideoContext;
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static unsigned char *seq_unpack_rle_block(unsigned char *src, unsigned char *dst, int dst_size)
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{
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int i, len, sz;
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GetBitContext gb;
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int code_table[64];
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/* get the rle codes (at most 64 bytes) */
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init_get_bits(&gb, src, 64 * 8);
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for (i = 0, sz = 0; i < 64 && sz < dst_size; i++) {
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code_table[i] = get_sbits(&gb, 4);
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sz += FFABS(code_table[i]);
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}
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src += (get_bits_count(&gb) + 7) / 8;
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/* do the rle unpacking */
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for (i = 0; i < 64 && dst_size > 0; i++) {
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len = code_table[i];
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if (len < 0) {
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len = -len;
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memset(dst, *src++, FFMIN(len, dst_size));
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} else {
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memcpy(dst, src, FFMIN(len, dst_size));
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src += len;
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}
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dst += len;
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dst_size -= len;
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}
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return src;
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}
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static unsigned char *seq_decode_op1(SeqVideoContext *seq, unsigned char *src, unsigned char *dst)
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{
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unsigned char *color_table;
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int b, i, len, bits;
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GetBitContext gb;
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len = *src++;
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if (len & 0x80) {
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switch (len & 3) {
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case 1:
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src = seq_unpack_rle_block(src, seq->block, sizeof(seq->block));
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for (b = 0; b < 8; b++) {
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memcpy(dst, &seq->block[b * 8], 8);
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dst += seq->frame.linesize[0];
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}
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break;
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case 2:
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src = seq_unpack_rle_block(src, seq->block, sizeof(seq->block));
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for (i = 0; i < 8; i++) {
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for (b = 0; b < 8; b++)
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dst[b * seq->frame.linesize[0]] = seq->block[i * 8 + b];
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++dst;
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}
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break;
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}
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} else {
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color_table = src;
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src += len;
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bits = ff_log2_tab[len - 1] + 1;
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init_get_bits(&gb, src, bits * 8 * 8); src += bits * 8;
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for (b = 0; b < 8; b++) {
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for (i = 0; i < 8; i++)
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dst[i] = color_table[get_bits(&gb, bits)];
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dst += seq->frame.linesize[0];
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}
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}
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return src;
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}
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static unsigned char *seq_decode_op2(SeqVideoContext *seq, unsigned char *src, unsigned char *dst)
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{
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int i;
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for (i = 0; i < 8; i++) {
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memcpy(dst, src, 8);
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src += 8;
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dst += seq->frame.linesize[0];
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}
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return src;
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}
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static unsigned char *seq_decode_op3(SeqVideoContext *seq, unsigned char *src, unsigned char *dst)
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{
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int pos, offset;
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do {
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pos = *src++;
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offset = ((pos >> 3) & 7) * seq->frame.linesize[0] + (pos & 7);
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dst[offset] = *src++;
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} while (!(pos & 0x80));
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return src;
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}
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static void seqvideo_decode(SeqVideoContext *seq, unsigned char *data, int data_size)
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{
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GetBitContext gb;
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int flags, i, j, x, y, op;
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unsigned char c[3];
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unsigned char *dst;
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flags = *data++;
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if (flags & 1) {
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for (i = 0; i < 256; i++) {
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for (j = 0; j < 3; j++, data++)
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c[j] = (*data << 2) | (*data >> 4);
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seq->palette[i] = (c[0] << 16) | (c[1] << 8) | c[2];
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}
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memcpy(seq->frame.data[1], seq->palette, sizeof(seq->palette));
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seq->frame.palette_has_changed = 1;
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}
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if (flags & 2) {
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init_get_bits(&gb, data, 128 * 8); data += 128;
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for (y = 0; y < 128; y += 8)
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for (x = 0; x < 256; x += 8) {
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dst = &seq->frame.data[0][y * seq->frame.linesize[0] + x];
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op = get_bits(&gb, 2);
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switch (op) {
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case 1:
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data = seq_decode_op1(seq, data, dst);
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break;
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case 2:
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data = seq_decode_op2(seq, data, dst);
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break;
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case 3:
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data = seq_decode_op3(seq, data, dst);
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break;
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}
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}
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}
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}
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static int seqvideo_decode_init(AVCodecContext *avctx)
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{
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SeqVideoContext *seq = (SeqVideoContext *)avctx->priv_data;
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seq->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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seq->frame.data[0] = NULL;
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return 0;
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}
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static int seqvideo_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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SeqVideoContext *seq = (SeqVideoContext *)avctx->priv_data;
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seq->frame.reference = 1;
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seq->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
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if (avctx->reget_buffer(avctx, &seq->frame)) {
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av_log(seq->avctx, AV_LOG_ERROR, "tiertexseqvideo: reget_buffer() failed\n");
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return -1;
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}
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seqvideo_decode(seq, buf, buf_size);
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*data_size = sizeof(AVFrame);
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*(AVFrame *)data = seq->frame;
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return buf_size;
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}
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static int seqvideo_decode_end(AVCodecContext *avctx)
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{
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SeqVideoContext *seq = (SeqVideoContext *)avctx->priv_data;
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if (seq->frame.data[0])
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avctx->release_buffer(avctx, &seq->frame);
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return 0;
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}
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AVCodec tiertexseqvideo_decoder = {
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"tiertexseqvideo",
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CODEC_TYPE_VIDEO,
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CODEC_ID_TIERTEXSEQVIDEO,
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sizeof(SeqVideoContext),
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seqvideo_decode_init,
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NULL,
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seqvideo_decode_end,
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seqvideo_decode_frame,
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CODEC_CAP_DR1,
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};
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