[libav-devel] [PATCH 2/2] mlp_parser: Drop in-parser downmix functionality

[Vittorio Giovara]

request_channel_layout is a decoder option and it makes no sense
to have it in a parser.

See the previous commit for a more detailed explanation.

Signed-off-by: Vittorio Giovara <vittorio.giov...@gmail.com>
---
 libavcodec/mlp_parser.c | 23 +++--------------------
 libavcodec/mlp_parser.h |  2 --
 libavcodec/mlpdec.c     |  7 ++++++-
 3 files changed, 9 insertions(+), 23 deletions(-)

diff --git a/libavcodec/mlp_parser.c b/libavcodec/mlp_parser.c
index 7d73058e4c..bff6258cba 100644
--- a/libavcodec/mlp_parser.c
+++ b/libavcodec/mlp_parser.c
@@ -120,11 +120,6 @@ static uint64_t truehd_layout(int chanmap)
     return layout;
 }
 
-int ff_mlp_channel_layout_subset(uint64_t channel_layout, uint64_t mask)
-{
-    return channel_layout && ((channel_layout & mask) == channel_layout);
-}
-
 static int mlp_get_major_sync_size(const uint8_t * buf, int bufsize)
 {
     int has_extension, extensions = 0;
@@ -336,8 +331,6 @@ static int mlp_parse(AVCodecParserContext *s,
     } else {
         BitstreamContext bc;
         MLPHeaderInfo mh;
-        int stereo_requested = 
ff_mlp_channel_layout_subset(avctx->request_channel_layout,
-                                                            
AV_CH_LAYOUT_STEREO);
 
         bitstream_init8(&bc, buf + 4, buf_size - 4);
         if (ff_mlp_read_major_sync(avctx, &mh, &bc) < 0)
@@ -353,21 +346,11 @@ static int mlp_parse(AVCodecParserContext *s,
 
         if (mh.stream_type == 0xbb) {
             /* MLP stream */
-            if (stereo_requested && mh.num_substreams > 1) {
-                avctx->channels       = 2;
-                avctx->channel_layout = AV_CH_LAYOUT_STEREO;
-            } else {
-                avctx->channels       = mh.channels_mlp;
-                avctx->channel_layout = mh.channel_layout_mlp;
-            }
+            avctx->channels       = mh.channels_mlp;
+            avctx->channel_layout = mh.channel_layout_mlp;
         } else { /* mh.stream_type == 0xba */
             /* TrueHD stream */
-            if (stereo_requested && mh.num_substreams > 1) {
-                avctx->channels       = 2;
-                avctx->channel_layout = AV_CH_LAYOUT_STEREO;
-            } else if (!mh.channels_thd_stream2 ||
-                       
ff_mlp_channel_layout_subset(avctx->request_channel_layout,
-                                                    
mh.channel_layout_thd_stream1)) {
+            if (!mh.channels_thd_stream2) {
                 avctx->channels       = mh.channels_thd_stream1;
                 avctx->channel_layout = mh.channel_layout_thd_stream1;
             } else {
diff --git a/libavcodec/mlp_parser.h b/libavcodec/mlp_parser.h
index 946f4d240c..871b96db20 100644
--- a/libavcodec/mlp_parser.h
+++ b/libavcodec/mlp_parser.h
@@ -63,6 +63,4 @@ typedef struct MLPHeaderInfo
 
 int ff_mlp_read_major_sync(void *log, MLPHeaderInfo *mh, BitstreamContext *bc);
 
-int ff_mlp_channel_layout_subset(uint64_t channel_layout, uint64_t mask);
-
 #endif /* AVCODEC_MLP_PARSER_H */
diff --git a/libavcodec/mlpdec.c b/libavcodec/mlpdec.c
index fa94f6f5b4..10cf3abdab 100644
--- a/libavcodec/mlpdec.c
+++ b/libavcodec/mlpdec.c
@@ -178,6 +178,11 @@ static const uint64_t thd_channel_order[] = {
     AV_CH_LOW_FREQUENCY_2,                                   // LFE2
 };
 
+int mlp_channel_layout_subset(uint64_t channel_layout, uint64_t mask)
+{
+    return channel_layout && ((channel_layout & mask) == channel_layout);
+}
+
 static uint64_t thd_channel_layout_extract_channel(uint64_t channel_layout,
                                                    int index)
 {
@@ -511,7 +516,7 @@ static int read_restart_header(MLPDecodeContext *m, 
BitstreamContext *bc,
     s->max_channel        = max_channel;
     s->max_matrix_channel = max_matrix_channel;
 
-    if (ff_mlp_channel_layout_subset(m->avctx->request_channel_layout, 
s->mask) &&
+    if (mlp_channel_layout_subset(m->avctx->request_channel_layout, s->mask) &&
         m->max_decoded_substream > substr) {
         av_log(m->avctx, AV_LOG_DEBUG,
                "Extracting %d-channel downmix (0x%"PRIx64") from substream %d. 
"
-- 
2.12.0

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