making act segmenter

1 files changed, 201 insertions, 0 deletions

diff --git a/ffmpeg/libavcodec/vc1_parser.c b/ffmpeg/libavcodec/vc1_parser.c
new file mode 100644
index 0000000..53af61c
--- /dev/null
+++ b/ffmpeg/libavcodec/vc1_parser.c
@@ -0,0 +1,201 @@
+/*
+ * VC-1 and WMV3 parser
+ * Copyright (c) 2006-2007 Konstantin Shishkov
+ * Partly based on vc9.c (c) 2005 Anonymous, Alex Beregszaszi, Michael Niedermayer
+ *
+ * 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
+ * VC-1 and WMV3 parser
+ */
+
+#include "parser.h"
+#include "vc1.h"
+#include "get_bits.h"
+
+typedef struct {
+    ParseContext pc;
+    VC1Context v;
+} VC1ParseContext;
+
+static void vc1_extract_headers(AVCodecParserContext *s, AVCodecContext *avctx,
+                                const uint8_t *buf, int buf_size)
+{
+    VC1ParseContext *vpc = s->priv_data;
+    GetBitContext gb;
+    const uint8_t *start, *end, *next;
+    uint8_t *buf2 = av_mallocz(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
+
+    vpc->v.s.avctx = avctx;
+    vpc->v.parse_only = 1;
+    next = buf;
+    s->repeat_pict = 0;
+
+    for(start = buf, end = buf + buf_size; next < end; start = next){
+        int buf2_size, size;
+
+        next = find_next_marker(start + 4, end);
+        size = next - start - 4;
+        buf2_size = vc1_unescape_buffer(start + 4, size, buf2);
+        init_get_bits(&gb, buf2, buf2_size * 8);
+        if(size <= 0) continue;
+        switch(AV_RB32(start)){
+        case VC1_CODE_SEQHDR:
+            ff_vc1_decode_sequence_header(avctx, &vpc->v, &gb);
+            break;
+        case VC1_CODE_ENTRYPOINT:
+            ff_vc1_decode_entry_point(avctx, &vpc->v, &gb);
+            break;
+        case VC1_CODE_FRAME:
+            if(vpc->v.profile < PROFILE_ADVANCED)
+                ff_vc1_parse_frame_header    (&vpc->v, &gb);
+            else
+                ff_vc1_parse_frame_header_adv(&vpc->v, &gb);
+
+            /* keep AV_PICTURE_TYPE_BI internal to VC1 */
+            if (vpc->v.s.pict_type == AV_PICTURE_TYPE_BI)
+                s->pict_type = AV_PICTURE_TYPE_B;
+            else
+                s->pict_type = vpc->v.s.pict_type;
+
+            if (avctx->ticks_per_frame > 1){
+                // process pulldown flags
+                s->repeat_pict = 1;
+                // Pulldown flags are only valid when 'broadcast' has been set.
+                // So ticks_per_frame will be 2
+                if (vpc->v.rff){
+                    // repeat field
+                    s->repeat_pict = 2;
+                }else if (vpc->v.rptfrm){
+                    // repeat frames
+                    s->repeat_pict = vpc->v.rptfrm * 2 + 1;
+                }
+            }
+
+            break;
+        }
+    }
+
+    av_free(buf2);
+}
+
+/**
+ * Find the end of the current frame in the bitstream.
+ * @return the position of the first byte of the next frame, or -1
+ */
+static int vc1_find_frame_end(ParseContext *pc, const uint8_t *buf,
+                               int buf_size) {
+    int pic_found, i;
+    uint32_t state;
+
+    pic_found= pc->frame_start_found;
+    state= pc->state;
+
+    i=0;
+    if(!pic_found){
+        for(i=0; i<buf_size; i++){
+            state= (state<<8) | buf[i];
+            if(state == VC1_CODE_FRAME || state == VC1_CODE_FIELD){
+                i++;
+                pic_found=1;
+                break;
+            }
+        }
+    }
+
+    if(pic_found){
+        /* EOF considered as end of frame */
+        if (buf_size == 0)
+            return 0;
+        for(; i<buf_size; i++){
+            state= (state<<8) | buf[i];
+            if(IS_MARKER(state) && state != VC1_CODE_FIELD && state != VC1_CODE_SLICE){
+                pc->frame_start_found=0;
+                pc->state=-1;
+                return i-3;
+            }
+        }
+    }
+    pc->frame_start_found= pic_found;
+    pc->state= state;
+    return END_NOT_FOUND;
+}
+
+static int vc1_parse(AVCodecParserContext *s,
+                           AVCodecContext *avctx,
+                           const uint8_t **poutbuf, int *poutbuf_size,
+                           const uint8_t *buf, int buf_size)
+{
+    VC1ParseContext *vpc = s->priv_data;
+    int next;
+
+    if(s->flags & PARSER_FLAG_COMPLETE_FRAMES){
+        next= buf_size;
+    }else{
+        next= vc1_find_frame_end(&vpc->pc, buf, buf_size);
+
+        if (ff_combine_frame(&vpc->pc, next, &buf, &buf_size) < 0) {
+            *poutbuf = NULL;
+            *poutbuf_size = 0;
+            return buf_size;
+        }
+    }
+
+    vc1_extract_headers(s, avctx, buf, buf_size);
+
+    *poutbuf = buf;
+    *poutbuf_size = buf_size;
+    return next;
+}
+
+static int vc1_split(AVCodecContext *avctx,
+                           const uint8_t *buf, int buf_size)
+{
+    int i;
+    uint32_t state= -1;
+    int charged=0;
+
+    for(i=0; i<buf_size; i++){
+        state= (state<<8) | buf[i];
+        if(IS_MARKER(state)){
+            if(state == VC1_CODE_SEQHDR || state == VC1_CODE_ENTRYPOINT){
+                charged=1;
+            }else if(charged){
+                return i-3;
+            }
+        }
+    }
+    return 0;
+}
+
+static int vc1_parse_init(AVCodecParserContext *s)
+{
+    VC1ParseContext *vpc = s->priv_data;
+    vpc->v.s.slice_context_count = 1;
+    return ff_vc1_init_common(&vpc->v);
+}
+
+AVCodecParser ff_vc1_parser = {
+    .codec_ids      = { AV_CODEC_ID_VC1 },
+    .priv_data_size = sizeof(VC1ParseContext),
+    .parser_init    = vc1_parse_init,
+    .parser_parse   = vc1_parse,
+    .parser_close   = ff_parse_close,
+    .split          = vc1_split,
+};