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Diffstat (limited to 'ffmpeg1/libavcodec/tiertexseqv.c')
-rw-r--r--ffmpeg1/libavcodec/tiertexseqv.c267
1 files changed, 267 insertions, 0 deletions
diff --git a/ffmpeg1/libavcodec/tiertexseqv.c b/ffmpeg1/libavcodec/tiertexseqv.c
new file mode 100644
index 0000000..f892e4d
--- /dev/null
+++ b/ffmpeg1/libavcodec/tiertexseqv.c
@@ -0,0 +1,267 @@
+/*
+ * 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"),
+};
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