ac3_parser: add a public function for parsing the data required by the demuxer

Make the current semi-public avpriv_ac3_parse_header() private to lavc.

Signed-off-by: Diego Biurrun <diego@biurrun.de>

1 files changed, 33 insertions, 2 deletions

diff --git a/libavcodec/ac3_parser.c b/libavcodec/ac3_parser.c
index 970484810b..53189e0d4e 100644
--- a/libavcodec/ac3_parser.c
+++ b/libavcodec/ac3_parser.c
@@ -20,15 +20,19 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#include "config.h"
+
 #include "libavutil/channel_layout.h"
 #include "parser.h"
 #include "ac3_parser.h"
+#include "ac3_parser_internal.h"
 #include "aac_ac3_parser.h"
 #include "get_bits.h"
 
 
 #define AC3_HEADER_SIZE 7
 
+#if CONFIG_AC3_PARSER
 
 static const uint8_t eac3_blocks[4] = {
     1, 2, 3, 6
@@ -47,7 +51,7 @@ static const uint8_t center_levels[4] = { 4, 5, 6, 5 };
 static const uint8_t surround_levels[4] = { 4, 6, 7, 6 };
 
 
-int avpriv_ac3_parse_header(GetBitContext *gbc, AC3HeaderInfo *hdr)
+int ff_ac3_parse_header(GetBitContext *gbc, AC3HeaderInfo *hdr)
 {
     int frame_size_code;
 
@@ -144,6 +148,24 @@ int avpriv_ac3_parse_header(GetBitContext *gbc, AC3HeaderInfo *hdr)
     return 0;
 }
 
+int av_ac3_parse_header(const uint8_t *buf, size_t size,
+                        uint8_t *bitstream_id, uint16_t *frame_size)
+{
+    GetBitContext gb;
+    AC3HeaderInfo hdr;
+    int err;
+
+    init_get_bits8(&gb, buf, size);
+    err = ff_ac3_parse_header(&gb, &hdr);
+    if (err < 0)
+        return AVERROR_INVALIDDATA;
+
+    *bitstream_id = hdr.bitstream_id;
+    *frame_size   = hdr.frame_size;
+
+    return 0;
+}
+
 static int ac3_sync(uint64_t state, AACAC3ParseContext *hdr_info,
         int *need_next_header, int *new_frame_start)
 {
@@ -156,7 +178,7 @@ static int ac3_sync(uint64_t state, AACAC3ParseContext *hdr_info,
     GetBitContext gbc;
 
     init_get_bits(&gbc, tmp.u8+8-AC3_HEADER_SIZE, 54);
-    err = avpriv_ac3_parse_header(&gbc, &hdr);
+    err = ff_ac3_parse_header(&gbc, &hdr);
 
     if(err < 0)
         return 0;
@@ -195,3 +217,12 @@ AVCodecParser ff_ac3_parser = {
     .parser_parse   = ff_aac_ac3_parse,
     .parser_close   = ff_parse_close,
 };
+
+#else
+
+int av_ac3_parse_header(const uint8_t *buf, size_t size,
+                        uint8_t *bitstream_id, uint16_t *frame_size)
+{
+    return AVERROR(ENOSYS);
+}
+#endif