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authorMichael Niedermayer <michaelni@gmx.at>2005-04-20 09:42:47 +0000
committerMichael Niedermayer <michaelni@gmx.at>2005-04-20 09:42:47 +0000
commit856dbbff7f3e7a78cc1a435cacf7f273f3e7277d (patch)
tree4ab5c84c19c477adcd4fe6cb9102192f89b9da52 /libavcodec/indeo2.c
parent29df259923ec9c4d65bc127aeb734569dc5eaae6 (diff)
downloadffmpeg-856dbbff7f3e7a78cc1a435cacf7f273f3e7277d.tar.gz
Indeo 2 decoder by (Kostya <> kostya.shishkov gmail com)
Originally committed as revision 4141 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/indeo2.c')
-rw-r--r--libavcodec/indeo2.c214
1 files changed, 214 insertions, 0 deletions
diff --git a/libavcodec/indeo2.c b/libavcodec/indeo2.c
new file mode 100644
index 0000000000..a2f4583c64
--- /dev/null
+++ b/libavcodec/indeo2.c
@@ -0,0 +1,214 @@
+/*
+ * Indel Indeo 2 codec
+ * Copyright (c) 2005 Konstantin Shishkov
+ *
+ * This library 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 of the License, or (at your option) any later version.
+ *
+ * This library 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 this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+/**
+ * @file indeo2.c
+ * Intel Indeo 2 decoder.
+ */
+
+#include "avcodec.h"
+#include "bitstream.h"
+#include "indeo2data.h"
+
+typedef struct Ir2Context{
+ AVCodecContext *avctx;
+ AVFrame picture;
+ GetBitContext gb;
+ int decode_delta;
+} Ir2Context;
+
+#define CODE_VLC_BITS 14
+static VLC ir2_vlc;
+
+/* Indeo 2 codes are in range 0x01..0x7F and 0x81..0x90 */
+static inline int ir2_get_code(GetBitContext *gb)
+{
+ int code;
+
+ code = get_vlc2(gb, ir2_vlc.table, CODE_VLC_BITS, 1) + 1;
+ if (code >= 0x80)
+ return (code + 1);
+ return code;
+}
+#define CLAMP_TO_BYTE(value) \
+if (value > 255) \
+ value = 255; \
+else if (value < 0) \
+ value = 0; \
+
+static void ir2_decode_plane(Ir2Context *ctx, int width, int height, uint8_t *dst, int stride,
+ const uint8_t *table)
+{
+ int i;
+ int j;
+ int out = 0;
+ int c;
+ int t;
+
+ /* first line contain absolute values, other lines contain deltas */
+ while (out < width){
+ c = ir2_get_code(&ctx->gb);
+ if(c > 0x80) { /* we have a run */
+ c -= 0x80;
+ for (i = 0; i < c * 2; i++)
+ dst[out++] = 0x80;
+ } else { /* copy two values from table */
+ dst[out++] = table[c * 2];
+ dst[out++] = table[(c * 2) + 1];
+ }
+ }
+ dst += stride;
+
+ for (j = 1; j < height; j++){
+ out = 0;
+ while (out < width){
+ c = ir2_get_code(&ctx->gb);
+ if(c > 0x80) { /* we have a skip */
+ c -= 0x80;
+ for (i = 0; i < c * 2; i++) {
+ dst[out] = dst[out - stride];
+ out++;
+ }
+ } else { /* add two deltas from table */
+ t = dst[out - stride] + (table[c * 2] - 128);
+ CLAMP_TO_BYTE(t);
+ dst[out] = t;
+ out++;
+ t = dst[out - stride] + (table[(c * 2) + 1] - 128);
+ CLAMP_TO_BYTE(t);
+ dst[out] = t;
+ out++;
+ }
+ }
+ dst += stride;
+ }
+}
+
+static void ir2_decode_plane_inter(Ir2Context *ctx, int width, int height, uint8_t *dst, int stride,
+ const uint8_t *table)
+{
+ int j;
+ int out = 0;
+ int c;
+ int t;
+
+ for (j = 0; j < height; j++){
+ out = 0;
+ while (out < width){
+ c = ir2_get_code(&ctx->gb);
+ if(c > 0x80) { /* we have a skip */
+ c -= 0x80;
+ out += c * 2;
+ } else { /* add two deltas from table */
+ t = dst[out] + (table[c * 2] - 128);
+ CLAMP_TO_BYTE(t);
+ dst[out] = t;
+ out++;
+ t = dst[out] + (table[(c * 2) + 1] - 128);
+ CLAMP_TO_BYTE(t);
+ dst[out] = t;
+ out++;
+ }
+ }
+ dst += stride;
+ }
+}
+
+static int ir2_decode_frame(AVCodecContext *avctx,
+ void *data, int *data_size,
+ uint8_t *buf, int buf_size)
+{
+ Ir2Context * const s = avctx->priv_data;
+ AVFrame *picture = data;
+ AVFrame * const p= (AVFrame*)&s->picture;
+ int start;
+ int i;
+
+ if(p->data[0])
+ avctx->release_buffer(avctx, p);
+
+ p->reference = 1;
+ p->buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
+ if (avctx->reget_buffer(avctx, p)) {
+ av_log(s->avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
+ return -1;
+ }
+
+ s->decode_delta = buf[18];
+
+ /* decide whether frame uses deltas or not */
+
+ for (i = 0; i < buf_size; i++)
+ buf[i] = ff_reverse[buf[i]];
+
+ start = 48; /* hardcoded for now */
+
+ init_get_bits(&s->gb, buf + start, buf_size - start);
+
+ if (s->decode_delta) { /* intraframe */
+ ir2_decode_plane(s, avctx->width, avctx->height,
+ s->picture.data[0], s->picture.linesize[0], ir2_luma_table);
+ /* swapped U and V */
+ ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
+ s->picture.data[2], s->picture.linesize[2], ir2_luma_table);
+ ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
+ s->picture.data[1], s->picture.linesize[1], ir2_luma_table);
+ } else { /* interframe */
+ ir2_decode_plane_inter(s, avctx->width, avctx->height,
+ s->picture.data[0], s->picture.linesize[0], ir2_luma_table);
+ /* swapped U and V */
+ ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
+ s->picture.data[2], s->picture.linesize[2], ir2_luma_table);
+ ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
+ s->picture.data[1], s->picture.linesize[1], ir2_luma_table);
+ }
+
+ *picture= *(AVFrame*)&s->picture;
+ *data_size = sizeof(AVPicture);
+
+ return buf_size;
+}
+
+static int ir2_decode_init(AVCodecContext *avctx){
+ Ir2Context * const ic = avctx->priv_data;
+
+ ic->avctx = avctx;
+
+ avctx->pix_fmt= PIX_FMT_YUV410P;
+
+ if (!ir2_vlc.table)
+ init_vlc(&ir2_vlc, CODE_VLC_BITS, IR2_CODES,
+ &ir2_codes[0][1], 4, 2,
+ &ir2_codes[0][0], 4, 2, 1);
+
+ return 0;
+}
+
+AVCodec indeo2_decoder = {
+ "indeo2",
+ CODEC_TYPE_VIDEO,
+ CODEC_ID_INDEO2,
+ sizeof(Ir2Context),
+ ir2_decode_init,
+ NULL,
+ NULL,
+ ir2_decode_frame,
+ CODEC_CAP_DR1,
+};