From 4e6eeaf01968a22748e27590d29f343323cca9c6 Mon Sep 17 00:00:00 2001
From: Bartlomiej Wolowiec <bartek.wolowiec@gmail.com>
Date: Mon, 24 Mar 2008 21:25:49 +0000
Subject: [PATCH] using stream type in eac3 parser

Originally committed as revision 12570 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavcodec/aac_ac3_parser.h | 1 +
 libavcodec/aac_parser.c     | 1 +
 libavcodec/ac3.h            | 7 +++++++
 libavcodec/ac3_parser.c     | 6 +++++-
 libavcodec/ac3_parser.h     | 1 +
 libavcodec/ac3dec.c         | 3 +++
 6 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/libavcodec/aac_ac3_parser.h b/libavcodec/aac_ac3_parser.h
index f93f8a8..4998250 100644
--- a/libavcodec/aac_ac3_parser.h
+++ b/libavcodec/aac_ac3_parser.h
@@ -37,6 +37,7 @@ typedef struct AACAC3ParseContext {
     int sample_rate;
     int bit_rate;
     int samples;
+    uint8_t stream_type;
 } AACAC3ParseContext;
 
 int ff_aac_ac3_parse(AVCodecParserContext *s1,
diff --git a/libavcodec/aac_parser.c b/libavcodec/aac_parser.c
index 37f014c..4e8ddc1 100644
--- a/libavcodec/aac_parser.c
+++ b/libavcodec/aac_parser.c
@@ -83,6 +83,7 @@ static int aac_sync(AACAC3ParseContext *hdr_info)
 static av_cold int aac_parse_init(AVCodecParserContext *s1)
 {
     AACAC3ParseContext *s = s1->priv_data;
+    s->stream_type = 0;
     s->inbuf_ptr = s->inbuf;
     s->header_size = AAC_HEADER_SIZE;
     s->sync = aac_sync;
diff --git a/libavcodec/ac3.h b/libavcodec/ac3.h
index b5fa789..7c2e3d9 100644
--- a/libavcodec/ac3.h
+++ b/libavcodec/ac3.h
@@ -84,6 +84,7 @@ typedef struct {
     uint8_t bitstream_id;
     uint8_t channel_mode;
     uint8_t lfe_on;
+    uint8_t stream_type;
     /** @} */
 
     /** @defgroup derived Derived values
@@ -97,6 +98,12 @@ typedef struct {
     /** @} */
 } AC3HeaderInfo;
 
+typedef enum {
+    EAC3_STREAM_TYPE_INDEPENDENT = 0,
+    EAC3_STREAM_TYPE_DEPENDENT,
+    EAC3_STREAM_TYPE_AC3_CONVERT,
+    EAC3_STREAM_TYPE_RESERVED
+} EAC3StreamType;
 
 void ac3_common_init(void);
 
diff --git a/libavcodec/ac3_parser.c b/libavcodec/ac3_parser.c
index 0a8c804..393133e 100644
--- a/libavcodec/ac3_parser.c
+++ b/libavcodec/ac3_parser.c
@@ -84,10 +84,14 @@ int ff_ac3_parse_header(const uint8_t buf[7], AC3HeaderInfo *hdr)
         hdr->bit_rate = (ff_ac3_bitrate_tab[frame_size_code>>1] * 1000) >> hdr->sr_shift;
         hdr->channels = ff_ac3_channels_tab[hdr->channel_mode] + hdr->lfe_on;
         hdr->frame_size = ff_ac3_frame_size_tab[frame_size_code][hdr->sr_code] * 2;
+        hdr->stream_type = 0;
     } else {
         /* Enhanced AC-3 */
         hdr->crc1 = 0;
-        skip_bits(&gbc, 2); // skip stream type
+        hdr->stream_type = get_bits(&gbc, 2);
+        if(hdr->stream_type == 3)
+            return AC3_PARSE_ERROR_STREAM_TYPE;
+
         skip_bits(&gbc, 3); // skip substream id
 
         hdr->frame_size = (get_bits(&gbc, 11) + 1) << 1;
diff --git a/libavcodec/ac3_parser.h b/libavcodec/ac3_parser.h
index ffac619..f82be02 100644
--- a/libavcodec/ac3_parser.h
+++ b/libavcodec/ac3_parser.h
@@ -30,6 +30,7 @@ typedef enum {
     AC3_PARSE_ERROR_BSID        = -2,
     AC3_PARSE_ERROR_SAMPLE_RATE = -3,
     AC3_PARSE_ERROR_FRAME_SIZE  = -4,
+    AC3_PARSE_ERROR_STREAM_TYPE = -5,
 } AC3ParseError;
 
 /**
diff --git a/libavcodec/ac3dec.c b/libavcodec/ac3dec.c
index 75208de..79a8606 100644
--- a/libavcodec/ac3dec.c
+++ b/libavcodec/ac3dec.c
@@ -1151,6 +1151,9 @@ static int ac3_decode_frame(AVCodecContext * avctx, void *data, int *data_size,
             case AC3_PARSE_ERROR_FRAME_SIZE:
                 av_log(avctx, AV_LOG_ERROR, "invalid frame size\n");
                 break;
+            case AC3_PARSE_ERROR_STREAM_TYPE:
+                av_log(avctx, AV_LOG_ERROR, "invalid stream type\n");
+                break;
             default:
                 av_log(avctx, AV_LOG_ERROR, "invalid header\n");
                 break;
-- 
2.7.4