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Diffstat (limited to 'ffmpeg/libavcodec/indeo2.c')
-rw-r--r--ffmpeg/libavcodec/indeo2.c258
1 files changed, 258 insertions, 0 deletions
diff --git a/ffmpeg/libavcodec/indeo2.c b/ffmpeg/libavcodec/indeo2.c
new file mode 100644
index 0000000..f8e7415
--- /dev/null
+++ b/ffmpeg/libavcodec/indeo2.c
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+/*
+ * Intel Indeo 2 codec
+ * Copyright (c) 2005 Konstantin Shishkov
+ *
+ * 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
+ * Intel Indeo 2 decoder.
+ */
+
+#define BITSTREAM_READER_LE
+#include "libavutil/attributes.h"
+#include "avcodec.h"
+#include "get_bits.h"
+#include "indeo2data.h"
+#include "internal.h"
+#include "mathops.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)
+{
+ return get_vlc2(gb, ir2_vlc.table, CODE_VLC_BITS, 1) + 1;
+}
+
+static int 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;
+
+ if (width & 1)
+ return AVERROR_INVALIDDATA;
+
+ /* 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 -= 0x7F;
+ if (out + c*2 > width)
+ return AVERROR_INVALIDDATA;
+ 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 -= 0x7F;
+ if (out + c*2 > width)
+ return AVERROR_INVALIDDATA;
+ 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);
+ t = av_clip_uint8(t);
+ dst[out] = t;
+ out++;
+ t = dst[out - stride] + (table[(c * 2) + 1] - 128);
+ t = av_clip_uint8(t);
+ dst[out] = t;
+ out++;
+ }
+ }
+ dst += stride;
+ }
+ return 0;
+}
+
+static int 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;
+
+ if (width & 1)
+ return AVERROR_INVALIDDATA;
+
+ 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 -= 0x7F;
+ out += c * 2;
+ } else { /* add two deltas from table */
+ t = dst[out] + (((table[c * 2] - 128)*3) >> 2);
+ t = av_clip_uint8(t);
+ dst[out] = t;
+ out++;
+ t = dst[out] + (((table[(c * 2) + 1] - 128)*3) >> 2);
+ t = av_clip_uint8(t);
+ dst[out] = t;
+ out++;
+ }
+ }
+ dst += stride;
+ }
+ return 0;
+}
+
+static int ir2_decode_frame(AVCodecContext *avctx,
+ void *data, int *got_frame,
+ AVPacket *avpkt)
+{
+ Ir2Context * const s = avctx->priv_data;
+ const uint8_t *buf = avpkt->data;
+ int buf_size = avpkt->size;
+ AVFrame *picture = data;
+ AVFrame * const p = &s->picture;
+ int start, ret;
+
+ if ((ret = ff_reget_buffer(avctx, p)) < 0)
+ return ret;
+
+ start = 48; /* hardcoded for now */
+
+ if (start >= buf_size) {
+ av_log(s->avctx, AV_LOG_ERROR, "input buffer size too small (%d)\n", buf_size);
+ return AVERROR_INVALIDDATA;
+ }
+
+ s->decode_delta = buf[18];
+
+ /* decide whether frame uses deltas or not */
+#ifndef BITSTREAM_READER_LE
+ for (i = 0; i < buf_size; i++)
+ buf[i] = ff_reverse[buf[i]];
+#endif
+
+ init_get_bits(&s->gb, buf + start, (buf_size - start) * 8);
+
+ if (s->decode_delta) { /* intraframe */
+ if ((ret = ir2_decode_plane(s, avctx->width, avctx->height,
+ s->picture.data[0], s->picture.linesize[0],
+ ir2_luma_table)) < 0)
+ return ret;
+
+ /* swapped U and V */
+ if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
+ s->picture.data[2], s->picture.linesize[2],
+ ir2_luma_table)) < 0)
+ return ret;
+ if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
+ s->picture.data[1], s->picture.linesize[1],
+ ir2_luma_table)) < 0)
+ return ret;
+ } else { /* interframe */
+ if ((ret = ir2_decode_plane_inter(s, avctx->width, avctx->height,
+ s->picture.data[0], s->picture.linesize[0],
+ ir2_luma_table)) < 0)
+ return ret;
+ /* swapped U and V */
+ if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
+ s->picture.data[2], s->picture.linesize[2],
+ ir2_luma_table)) < 0)
+ return ret;
+ if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
+ s->picture.data[1], s->picture.linesize[1],
+ ir2_luma_table)) < 0)
+ return ret;
+ }
+
+ if ((ret = av_frame_ref(picture, &s->picture)) < 0)
+ return ret;
+
+ *got_frame = 1;
+
+ return buf_size;
+}
+
+static av_cold int ir2_decode_init(AVCodecContext *avctx)
+{
+ Ir2Context * const ic = avctx->priv_data;
+ static VLC_TYPE vlc_tables[1 << CODE_VLC_BITS][2];
+
+ avcodec_get_frame_defaults(&ic->picture);
+ ic->avctx = avctx;
+
+ avctx->pix_fmt= AV_PIX_FMT_YUV410P;
+
+ avcodec_get_frame_defaults(&ic->picture);
+
+ ir2_vlc.table = vlc_tables;
+ ir2_vlc.table_allocated = 1 << CODE_VLC_BITS;
+#ifdef BITSTREAM_READER_LE
+ init_vlc(&ir2_vlc, CODE_VLC_BITS, IR2_CODES,
+ &ir2_codes[0][1], 4, 2,
+ &ir2_codes[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC | INIT_VLC_LE);
+#else
+ init_vlc(&ir2_vlc, CODE_VLC_BITS, IR2_CODES,
+ &ir2_codes[0][1], 4, 2,
+ &ir2_codes[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC);
+#endif
+
+ return 0;
+}
+
+static av_cold int ir2_decode_end(AVCodecContext *avctx)
+{
+ Ir2Context * const ic = avctx->priv_data;
+ AVFrame *pic = &ic->picture;
+
+ av_frame_unref(pic);
+
+ return 0;
+}
+
+AVCodec ff_indeo2_decoder = {
+ .name = "indeo2",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_CODEC_ID_INDEO2,
+ .priv_data_size = sizeof(Ir2Context),
+ .init = ir2_decode_init,
+ .close = ir2_decode_end,
+ .decode = ir2_decode_frame,
+ .capabilities = CODEC_CAP_DR1,
+ .long_name = NULL_IF_CONFIG_SMALL("Intel Indeo 2"),
+};
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