TAK demuxer, decoder and parser

Signed-off-by: Paul B Mahol <onemda@gmail.com>

1 files changed, 126 insertions, 0 deletions

diff --git a/libavcodec/tak_parser.c b/libavcodec/tak_parser.c
new file mode 100644
index 0000000000..dcc37eca8f
--- /dev/null
+++ b/libavcodec/tak_parser.c
@@ -0,0 +1,126 @@
+/*
+ * TAK parser
+ * Copyright (c) 2012 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
+ * TAK parser
+ **/
+
+#include "parser.h"
+#include "tak.h"
+
+typedef struct TAKParseContext {
+    ParseContext  pc;
+    TAKStreamInfo ti;
+    int index;
+} TAKParseContext;
+
+static av_cold int tak_init(AVCodecParserContext *s)
+{
+    ff_tak_init_crc();
+    return 0;
+}
+
+static int tak_parse(AVCodecParserContext *s, AVCodecContext *avctx,
+                     const uint8_t **poutbuf, int *poutbuf_size,
+                     const uint8_t *buf, int buf_size)
+{
+    TAKParseContext *t = s->priv_data;
+    ParseContext *pc = &t->pc;
+    int next = END_NOT_FOUND;
+    GetBitContext gb;
+    int consumed = 0;
+    int needed = buf_size ? TAK_MAX_FRAME_HEADER_BYTES : 8;
+
+    if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
+        TAKStreamInfo ti;
+        init_get_bits(&gb, buf, buf_size);
+        if (!ff_tak_decode_frame_header(avctx, &gb, &ti, 127))
+            s->duration = t->ti.last_frame_samples ? t->ti.last_frame_samples :
+                                                     t->ti.frame_samples;
+        *poutbuf      = buf;
+        *poutbuf_size = buf_size;
+        return buf_size;
+    }
+
+    while (buf_size || t->index + needed <= pc->index) {
+        if (buf_size && t->index + TAK_MAX_FRAME_HEADER_BYTES > pc->index) {
+            int tmp_buf_size = FFMIN(2 * TAK_MAX_FRAME_HEADER_BYTES, buf_size);
+            const uint8_t *tmp_buf = buf;
+
+            ff_combine_frame(pc, END_NOT_FOUND, &tmp_buf, &tmp_buf_size);
+            consumed += tmp_buf_size;
+            buf      += tmp_buf_size;
+            buf_size -= tmp_buf_size;
+        }
+
+        for (; t->index + needed <= pc->index; t->index++) {
+            if (pc->buffer[ t->index     ] == 0xFF &&
+                pc->buffer[ t->index + 1 ] == 0xA0) {
+                TAKStreamInfo ti;
+
+                init_get_bits(&gb, pc->buffer + t->index,
+                              8 * (pc->index - t->index));
+                if (!ff_tak_decode_frame_header(avctx, &gb,
+                        pc->frame_start_found ? &ti : &t->ti, 127) &&
+                    !ff_tak_check_crc(pc->buffer + t->index,
+                                      get_bits_count(&gb) / 8)) {
+                    if (!pc->frame_start_found) {
+                        pc->frame_start_found = 1;
+                        s->duration = t->ti.last_frame_samples ?
+                                      t->ti.last_frame_samples :
+                                      t->ti.frame_samples;
+                    } else {
+                        pc->frame_start_found = 0;
+                        next = t->index - pc->index;
+                        t->index = 0;
+                        goto found;
+                    }
+                }
+            }
+        }
+    }
+found:
+
+    if (consumed && !buf_size && next == END_NOT_FOUND ||
+        ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
+        *poutbuf      = NULL;
+        *poutbuf_size = 0;
+        return buf_size + consumed;
+    }
+
+    if (next != END_NOT_FOUND) {
+        next += consumed;
+        pc->overread = FFMAX(0, -next);
+    }
+
+    *poutbuf      = buf;
+    *poutbuf_size = buf_size;
+    return next;
+}
+
+AVCodecParser ff_tak_parser = {
+    .codec_ids      = { AV_CODEC_ID_TAK },
+    .priv_data_size = sizeof(TAKParseContext),
+    .parser_init    = tak_init,
+    .parser_parse   = tak_parse,
+    .parser_close   = ff_parse_close,
+};