making act segmenter

1 files changed, 69 insertions, 0 deletions

diff --git a/ffmpeg/libavcodec/aac_parser.c b/ffmpeg/libavcodec/aac_parser.c
new file mode 100644
index 0000000..ab6ca4e
--- /dev/null
+++ b/ffmpeg/libavcodec/aac_parser.c
@@ -0,0 +1,69 @@
+/*
+ * Audio and Video frame extraction
+ * Copyright (c) 2003 Fabrice Bellard
+ * Copyright (c) 2003 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
+ */
+
+#include "parser.h"
+#include "aac_ac3_parser.h"
+#include "aacadtsdec.h"
+#include "get_bits.h"
+#include "mpeg4audio.h"
+
+static int aac_sync(uint64_t state, AACAC3ParseContext *hdr_info,
+        int *need_next_header, int *new_frame_start)
+{
+    GetBitContext bits;
+    AACADTSHeaderInfo hdr;
+    int size;
+    union {
+        uint64_t u64;
+        uint8_t  u8[8];
+    } tmp;
+
+    tmp.u64 = av_be2ne64(state);
+    init_get_bits(&bits, tmp.u8+8-AAC_ADTS_HEADER_SIZE, AAC_ADTS_HEADER_SIZE * 8);
+
+    if ((size = avpriv_aac_parse_header(&bits, &hdr)) < 0)
+        return 0;
+    *need_next_header = 0;
+    *new_frame_start  = 1;
+    hdr_info->sample_rate = hdr.sample_rate;
+    hdr_info->channels    = ff_mpeg4audio_channels[hdr.chan_config];
+    hdr_info->samples     = hdr.samples;
+    hdr_info->bit_rate    = hdr.bit_rate;
+    return size;
+}
+
+static av_cold int aac_parse_init(AVCodecParserContext *s1)
+{
+    AACAC3ParseContext *s = s1->priv_data;
+    s->header_size = AAC_ADTS_HEADER_SIZE;
+    s->sync = aac_sync;
+    return 0;
+}
+
+
+AVCodecParser ff_aac_parser = {
+    .codec_ids      = { AV_CODEC_ID_AAC },
+    .priv_data_size = sizeof(AACAC3ParseContext),
+    .parser_init    = aac_parse_init,
+    .parser_parse   = ff_aac_ac3_parse,
+    .parser_close   = ff_parse_close,
+};