summaryrefslogtreecommitdiff
path: root/ffmpeg1/libavcodec/tiertexseqv.c
diff options
context:
space:
mode:
Diffstat (limited to 'ffmpeg1/libavcodec/tiertexseqv.c')
-rw-r--r--ffmpeg1/libavcodec/tiertexseqv.c267
1 files changed, 0 insertions, 267 deletions
diff --git a/ffmpeg1/libavcodec/tiertexseqv.c b/ffmpeg1/libavcodec/tiertexseqv.c
deleted file mode 100644
index f892e4d..0000000
--- a/ffmpeg1/libavcodec/tiertexseqv.c
+++ /dev/null
@@ -1,267 +0,0 @@
-/*
- * Tiertex Limited SEQ Video Decoder
- * Copyright (c) 2006 Gregory Montoir (cyx@users.sourceforge.net)
- *
- * 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
- * Tiertex Limited SEQ video decoder
- */
-
-#include "avcodec.h"
-#define BITSTREAM_READER_LE
-#include "get_bits.h"
-#include "internal.h"
-
-
-typedef struct SeqVideoContext {
- AVCodecContext *avctx;
- AVFrame frame;
-} SeqVideoContext;
-
-
-static const unsigned char *seq_unpack_rle_block(const unsigned char *src,
- const unsigned char *src_end,
- unsigned char *dst, int dst_size)
-{
- int i, len, sz;
- GetBitContext gb;
- int code_table[64];
-
- /* get the rle codes */
- init_get_bits(&gb, src, (src_end - src) * 8);
- for (i = 0, sz = 0; i < 64 && sz < dst_size; i++) {
- if (get_bits_left(&gb) < 4)
- return NULL;
- code_table[i] = get_sbits(&gb, 4);
- sz += FFABS(code_table[i]);
- }
- src += (get_bits_count(&gb) + 7) / 8;
-
- /* do the rle unpacking */
- for (i = 0; i < 64 && dst_size > 0; i++) {
- len = code_table[i];
- if (len < 0) {
- len = -len;
- if (src_end - src < 1)
- return NULL;
- memset(dst, *src++, FFMIN(len, dst_size));
- } else {
- if (src_end - src < len)
- return NULL;
- memcpy(dst, src, FFMIN(len, dst_size));
- src += len;
- }
- dst += len;
- dst_size -= len;
- }
- return src;
-}
-
-static const unsigned char *seq_decode_op1(SeqVideoContext *seq,
- const unsigned char *src,
- const unsigned char *src_end,
- unsigned char *dst)
-{
- const unsigned char *color_table;
- int b, i, len, bits;
- GetBitContext gb;
- unsigned char block[8 * 8];
-
- if (src_end - src < 1)
- return NULL;
- len = *src++;
- if (len & 0x80) {
- switch (len & 3) {
- case 1:
- src = seq_unpack_rle_block(src, src_end, block, sizeof(block));
- for (b = 0; b < 8; b++) {
- memcpy(dst, &block[b * 8], 8);
- dst += seq->frame.linesize[0];
- }
- break;
- case 2:
- src = seq_unpack_rle_block(src, src_end, block, sizeof(block));
- for (i = 0; i < 8; i++) {
- for (b = 0; b < 8; b++)
- dst[b * seq->frame.linesize[0]] = block[i * 8 + b];
- ++dst;
- }
- break;
- }
- } else {
- if (len <= 0)
- return NULL;
- bits = ff_log2_tab[len - 1] + 1;
- if (src_end - src < len + 8 * bits)
- return NULL;
- color_table = src;
- src += len;
- init_get_bits(&gb, src, bits * 8 * 8); src += bits * 8;
- for (b = 0; b < 8; b++) {
- for (i = 0; i < 8; i++)
- dst[i] = color_table[get_bits(&gb, bits)];
- dst += seq->frame.linesize[0];
- }
- }
-
- return src;
-}
-
-static const unsigned char *seq_decode_op2(SeqVideoContext *seq,
- const unsigned char *src,
- const unsigned char *src_end,
- unsigned char *dst)
-{
- int i;
-
- if (src_end - src < 8 * 8)
- return NULL;
-
- for (i = 0; i < 8; i++) {
- memcpy(dst, src, 8);
- src += 8;
- dst += seq->frame.linesize[0];
- }
-
- return src;
-}
-
-static const unsigned char *seq_decode_op3(SeqVideoContext *seq,
- const unsigned char *src,
- const unsigned char *src_end,
- unsigned char *dst)
-{
- int pos, offset;
-
- do {
- if (src_end - src < 2)
- return NULL;
- pos = *src++;
- offset = ((pos >> 3) & 7) * seq->frame.linesize[0] + (pos & 7);
- dst[offset] = *src++;
- } while (!(pos & 0x80));
-
- return src;
-}
-
-static int seqvideo_decode(SeqVideoContext *seq, const unsigned char *data, int data_size)
-{
- const unsigned char *data_end = data + data_size;
- GetBitContext gb;
- int flags, i, j, x, y, op;
- unsigned char c[3];
- unsigned char *dst;
- uint32_t *palette;
-
- flags = *data++;
-
- if (flags & 1) {
- palette = (uint32_t *)seq->frame.data[1];
- if (data_end - data < 256 * 3)
- return AVERROR_INVALIDDATA;
- for (i = 0; i < 256; i++) {
- for (j = 0; j < 3; j++, data++)
- c[j] = (*data << 2) | (*data >> 4);
- palette[i] = 0xFFU << 24 | AV_RB24(c);
- }
- seq->frame.palette_has_changed = 1;
- }
-
- if (flags & 2) {
- if (data_end - data < 128)
- return AVERROR_INVALIDDATA;
- init_get_bits(&gb, data, 128 * 8); data += 128;
- for (y = 0; y < 128; y += 8)
- for (x = 0; x < 256; x += 8) {
- dst = &seq->frame.data[0][y * seq->frame.linesize[0] + x];
- op = get_bits(&gb, 2);
- switch (op) {
- case 1:
- data = seq_decode_op1(seq, data, data_end, dst);
- break;
- case 2:
- data = seq_decode_op2(seq, data, data_end, dst);
- break;
- case 3:
- data = seq_decode_op3(seq, data, data_end, dst);
- break;
- }
- if (!data)
- return AVERROR_INVALIDDATA;
- }
- }
- return 0;
-}
-
-static av_cold int seqvideo_decode_init(AVCodecContext *avctx)
-{
- SeqVideoContext *seq = avctx->priv_data;
-
- seq->avctx = avctx;
- avctx->pix_fmt = AV_PIX_FMT_PAL8;
-
- avcodec_get_frame_defaults(&seq->frame);
-
- return 0;
-}
-
-static int seqvideo_decode_frame(AVCodecContext *avctx,
- void *data, int *got_frame,
- AVPacket *avpkt)
-{
- const uint8_t *buf = avpkt->data;
- int buf_size = avpkt->size;
- int ret;
-
- SeqVideoContext *seq = avctx->priv_data;
-
- if ((ret = ff_reget_buffer(avctx, &seq->frame)) < 0)
- return ret;
-
- if (seqvideo_decode(seq, buf, buf_size))
- return AVERROR_INVALIDDATA;
-
- if ((ret = av_frame_ref(data, &seq->frame)) < 0)
- return ret;
- *got_frame = 1;
-
- return buf_size;
-}
-
-static av_cold int seqvideo_decode_end(AVCodecContext *avctx)
-{
- SeqVideoContext *seq = avctx->priv_data;
-
- av_frame_unref(&seq->frame);
-
- return 0;
-}
-
-AVCodec ff_tiertexseqvideo_decoder = {
- .name = "tiertexseqvideo",
- .type = AVMEDIA_TYPE_VIDEO,
- .id = AV_CODEC_ID_TIERTEXSEQVIDEO,
- .priv_data_size = sizeof(SeqVideoContext),
- .init = seqvideo_decode_init,
- .close = seqvideo_decode_end,
- .decode = seqvideo_decode_frame,
- .capabilities = CODEC_CAP_DR1,
- .long_name = NULL_IF_CONFIG_SMALL("Tiertex Limited SEQ video"),
-};
generated by cgit v1.2.3 (git 2.39.1) at 2025-12-06 16:16:11 +0000