ffmpeg: patch some E-AC-3 decoder calls.

Some samples (e.g. E-AC-3 from Blu-ray disc sources) would result
in two warnings being printed for each frame of every E-AC-3 track.

diff --git a/contrib/ffmpeg/A14-eac3-request-sample.patch b/contrib/ffmpeg/A14-eac3-request-sample.patch
new file mode 100644 (file)
index 0000000..5376533
--- /dev/null
+++ b/contrib/ffmpeg/A14-eac3-request-sample.patch
@@ -0,0 +1,87 @@
+From cce0074000cbcbe8f1fb3a9601cfb3ea0a50bc3f Mon Sep 17 00:00:00 2001
+From: Tim Walker <tdskywalker@gmail.com>
+Date: Fri, 1 Apr 2016 03:05:30 +0200
+Subject: [PATCH 1/2] eac3dec: don't call avpriv_request_sample every frame.
+
+These errors neither prevent nor stop successful decoding
+of the E-AC-3 stream's "core", causing avpriv_request_sample
+to be called for every single frame in the bitstream.
+---
+ libavcodec/ac3dec.h  |  2 ++
+ libavcodec/eac3dec.c | 10 ++++++++--
+ 2 files changed, 10 insertions(+), 2 deletions(-)
+
+diff --git a/libavcodec/ac3dec.h b/libavcodec/ac3dec.h
+index babd0a7..2468f5a 100644
+--- a/libavcodec/ac3dec.h
++++ b/libavcodec/ac3dec.h
+@@ -92,6 +92,8 @@ typedef struct AC3DecodeContext {
+     int lfe_mix_level_exists;               ///< indicates if lfemixlevcod is specified (lfemixlevcode)
+     int lfe_mix_level;                      ///< LFE mix level index                    (lfemixlevcod)
+     int eac3;                               ///< indicates if current frame is E-AC-3
++    int eac3_frame_dependent_found;         ///< bitstream has E-AC-3 dependent frame(s)
++    int eac3_subsbtreamid_found;            ///< bitstream has E-AC-3 additional substream(s)
+     int dolby_surround_mode;                ///< dolby surround mode                    (dsurmod)
+     int dolby_surround_ex_mode;             ///< dolby surround ex mode                 (dsurexmod)
+     int dolby_headphone_mode;               ///< dolby headphone mode                   (dheadphonmod)
+diff --git a/libavcodec/eac3dec.c b/libavcodec/eac3dec.c
+index b9d079c..fe52d27 100644
+--- a/libavcodec/eac3dec.c
++++ b/libavcodec/eac3dec.c
+@@ -300,7 +300,10 @@ int ff_eac3_parse_header(AC3DecodeContext *s)
+        application can select from. each independent stream can also contain
+        dependent streams which are used to add or replace channels. */
+     if (s->frame_type == EAC3_FRAME_TYPE_DEPENDENT) {
+-        avpriv_request_sample(s->avctx, "Dependent substream decoding");
++        if (!s->eac3_frame_dependent_found) {
++            s->eac3_frame_dependent_found = 1;
++            avpriv_request_sample(s->avctx, "Dependent substream decoding");
++        }
+         return AAC_AC3_PARSE_ERROR_FRAME_TYPE;
+     } else if (s->frame_type == EAC3_FRAME_TYPE_RESERVED) {
+         av_log(s->avctx, AV_LOG_ERROR, "Reserved frame type\n");
+@@ -312,7 +315,10 @@ int ff_eac3_parse_header(AC3DecodeContext *s)
+        associated to an independent stream have matching substream id's. */
+     if (s->substreamid) {
+         /* only decode substream with id=0. skip any additional substreams. */
+-        avpriv_request_sample(s->avctx, "Additional substreams");
++        if (!s->eac3_subsbtreamid_found) {
++            s->eac3_subsbtreamid_found = 1;
++            avpriv_request_sample(s->avctx, "Additional substreams");
++        }
+         return AAC_AC3_PARSE_ERROR_FRAME_TYPE;
+     }
+ 
+-- 
+2.5.4 (Apple Git-61)
+
+
+From bea249d14da03d249c78cb4dffc5d88121f3caa2 Mon Sep 17 00:00:00 2001
+From: Tim Walker <tdskywalker@gmail.com>
+Date: Fri, 1 Apr 2016 03:16:09 +0200
+Subject: [PATCH 2/2] ac3dec: change logging of skipped E-AC-3 substreams.
+
+Change log level from warning to debug: the E-AC-3 "core"
+substream can be successfully decoded without the additional
+and dependent substreams, and their presence is already
+indicated via avpriv_request_sample in ff_eac3_parse_header.
+---
+ libavcodec/ac3dec.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/libavcodec/ac3dec.c b/libavcodec/ac3dec.c
+index 4876ac0..02d02b2 100644
+--- a/libavcodec/ac3dec.c
++++ b/libavcodec/ac3dec.c
+@@ -1355,7 +1355,7 @@ static int ac3_decode_frame(AVCodecContext * avctx, void *data,
+             /* skip frame if CRC is ok. otherwise use error concealment. */
+             /* TODO: add support for substreams and dependent frames */
+             if (s->frame_type == EAC3_FRAME_TYPE_DEPENDENT || s->substreamid) {
+-                av_log(avctx, AV_LOG_WARNING, "unsupported frame type : "
++                av_log(avctx, AV_LOG_DEBUG, "unsupported frame type : "
+                        "skipping frame\n");
+                 *got_frame_ptr = 0;
+                 return buf_size;
+-- 
+2.5.4 (Apple Git-61)
+