Split out intel H263 decoder.

Originally committed as revision 21054 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 131 insertions, 0 deletions

diff --git a/libavcodec/intelh263dec.c b/libavcodec/intelh263dec.c
new file mode 100644
index 0000000000..4a0078b8c4
--- /dev/null
+++ b/libavcodec/intelh263dec.c
@@ -0,0 +1,131 @@
+/*
+ * H.263i decoder
+ *
+ * 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
+ */
+
+#include "mpegvideo.h"
+
+/* don't understand why they choose a different header ! */
+int ff_intel_h263_decode_picture_header(MpegEncContext *s)
+{
+    int format;
+
+    /* picture header */
+    if (get_bits_long(&s->gb, 22) != 0x20) {
+        av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n");
+        return -1;
+    }
+    s->picture_number = get_bits(&s->gb, 8); /* picture timestamp */
+
+    if (get_bits1(&s->gb) != 1) {
+        av_log(s->avctx, AV_LOG_ERROR, "Bad marker\n");
+        return -1;      /* marker */
+    }
+    if (get_bits1(&s->gb) != 0) {
+        av_log(s->avctx, AV_LOG_ERROR, "Bad H263 id\n");
+        return -1;      /* h263 id */
+    }
+    skip_bits1(&s->gb);         /* split screen off */
+    skip_bits1(&s->gb);         /* camera  off */
+    skip_bits1(&s->gb);         /* freeze picture release off */
+
+    format = get_bits(&s->gb, 3);
+    if (format != 7) {
+        av_log(s->avctx, AV_LOG_ERROR, "Intel H263 free format not supported\n");
+        return -1;
+    }
+    s->h263_plus = 0;
+
+    s->pict_type = FF_I_TYPE + get_bits1(&s->gb);
+
+    s->unrestricted_mv = get_bits1(&s->gb);
+    s->h263_long_vectors = s->unrestricted_mv;
+
+    if (get_bits1(&s->gb) != 0) {
+        av_log(s->avctx, AV_LOG_ERROR, "SAC not supported\n");
+        return -1;      /* SAC: off */
+    }
+    s->obmc= get_bits1(&s->gb);
+    s->pb_frame = get_bits1(&s->gb);
+
+    if(format == 7){
+        format = get_bits(&s->gb, 3);
+        if(format == 0 || format == 7){
+            av_log(s->avctx, AV_LOG_ERROR, "Wrong Intel H263 format\n");
+            return -1;
+        }
+        if(get_bits(&s->gb, 2))
+            av_log(s->avctx, AV_LOG_ERROR, "Bad value for reserved field\n");
+        s->loop_filter = get_bits1(&s->gb);
+        if(get_bits1(&s->gb))
+            av_log(s->avctx, AV_LOG_ERROR, "Bad value for reserved field\n");
+        if(get_bits1(&s->gb))
+            s->pb_frame = 2;
+        if(get_bits(&s->gb, 5))
+            av_log(s->avctx, AV_LOG_ERROR, "Bad value for reserved field\n");
+        if(get_bits(&s->gb, 5) != 1)
+            av_log(s->avctx, AV_LOG_ERROR, "Invalid marker\n");
+    }
+    if(format == 6){
+        int ar = get_bits(&s->gb, 4);
+        skip_bits(&s->gb, 9); // display width
+        skip_bits1(&s->gb);
+        skip_bits(&s->gb, 9); // display height
+        if(ar == 15){
+            skip_bits(&s->gb, 8); // aspect ratio - width
+            skip_bits(&s->gb, 8); // aspect ratio - height
+        }
+    }
+
+    s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
+    skip_bits1(&s->gb); /* Continuous Presence Multipoint mode: off */
+
+    if(s->pb_frame){
+        skip_bits(&s->gb, 3); //temporal reference for B-frame
+        skip_bits(&s->gb, 2); //dbquant
+    }
+
+    /* PEI */
+    while (get_bits1(&s->gb) != 0) {
+        skip_bits(&s->gb, 8);
+    }
+    s->f_code = 1;
+
+    s->y_dc_scale_table=
+    s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
+
+    if(s->avctx->debug&FF_DEBUG_PICT_INFO)
+        ff_h263_show_pict_info(s);
+
+    return 0;
+}
+
+AVCodec h263i_decoder = {
+    "h263i",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_H263I,
+    sizeof(MpegEncContext),
+    ff_h263_decode_init,
+    NULL,
+    ff_h263_decode_end,
+    ff_h263_decode_frame,
+    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
+    .long_name = NULL_IF_CONFIG_SMALL("Intel H.263"),
+    .pix_fmts= ff_pixfmt_list_420,
+};
+