making act segmenter

1 files changed, 96 insertions, 0 deletions

diff --git a/ffmpeg/libavcodec/adx_parser.c b/ffmpeg/libavcodec/adx_parser.c
new file mode 100644
index 0000000..706e242
--- /dev/null
+++ b/ffmpeg/libavcodec/adx_parser.c
@@ -0,0 +1,96 @@
+/*
+ * Copyright (c) 2011  Justin Ruggles
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * ADX audio parser
+ *
+ * Splits packets into individual blocks.
+ */
+
+#include "libavutil/intreadwrite.h"
+#include "parser.h"
+#include "adx.h"
+
+typedef struct ADXParseContext {
+    ParseContext pc;
+    int header_size;
+    int block_size;
+    int remaining;
+} ADXParseContext;
+
+static int adx_parse(AVCodecParserContext *s1,
+                           AVCodecContext *avctx,
+                           const uint8_t **poutbuf, int *poutbuf_size,
+                           const uint8_t *buf, int buf_size)
+{
+    ADXParseContext *s = s1->priv_data;
+    ParseContext *pc = &s->pc;
+    int next = END_NOT_FOUND;
+    int i;
+    uint64_t state = pc->state64;
+
+    if (!s->header_size) {
+        for (i = 0; i < buf_size; i++) {
+            state = (state << 8) | buf[i];
+            /* check for fixed fields in ADX header for possible match */
+            if ((state & 0xFFFF0000FFFFFF00) == 0x8000000003120400ULL) {
+                int channels    = state & 0xFF;
+                int header_size = ((state >> 32) & 0xFFFF) + 4;
+                if (channels > 0 && header_size >= 8) {
+                    s->header_size = header_size;
+                    s->block_size  = BLOCK_SIZE * channels;
+                    s->remaining   = i - 7 + s->header_size + s->block_size;
+                    break;
+                }
+            }
+        }
+        pc->state64 = state;
+    }
+
+    if (s->header_size) {
+        if (!s->remaining)
+            s->remaining = s->block_size;
+        if (s->remaining <= buf_size) {
+            next = s->remaining;
+            s->remaining = 0;
+        } else
+            s->remaining -= buf_size;
+    }
+
+    if (ff_combine_frame(pc, next, &buf, &buf_size) < 0 || !buf_size) {
+        *poutbuf      = NULL;
+        *poutbuf_size = 0;
+        return buf_size;
+    }
+
+    s1->duration = BLOCK_SAMPLES;
+
+    *poutbuf = buf;
+    *poutbuf_size = buf_size;
+    return next;
+}
+
+AVCodecParser ff_adx_parser = {
+    .codec_ids      = { AV_CODEC_ID_ADPCM_ADX },
+    .priv_data_size = sizeof(ADXParseContext),
+    .parser_parse   = adx_parse,
+    .parser_close   = ff_parse_close,
+};