From cab63a8b594cdc365bb2581a12b3ac8e6dd480b2 Mon Sep 17 00:00:00 2001
From: Vittorio Giovara <vittorio.giovara@gmail.com>
Date: Fri, 2 Oct 2015 12:43:39 +0200
Subject: [PATCH] dv: Mark internal frame reference as const

Silence a warning due to frame assignment in dvenc. All uses of the
reference in dvdec are read only, except the ones in the main decoding
function, so use the frame pointer directly there.
---
 libavcodec/dv.h    |  2 +-
 libavcodec/dvdec.c | 13 +++++++------
 2 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/libavcodec/dv.h b/libavcodec/dv.h
index b458aeab29..d032405a26 100644
--- a/libavcodec/dv.h
+++ b/libavcodec/dv.h
@@ -39,7 +39,7 @@ typedef struct DVwork_chunk {
 
 typedef struct DVVideoContext {
     const AVDVProfile *sys;
-    AVFrame         *frame;
+    const AVFrame   *frame;
     AVCodecContext  *avctx;
     uint8_t         *buf;
 
diff --git a/libavcodec/dvdec.c b/libavcodec/dvdec.c
index 9ee9933cdc..463d108b28 100644
--- a/libavcodec/dvdec.c
+++ b/libavcodec/dvdec.c
@@ -350,6 +350,7 @@ static int dvvideo_decode_frame(AVCodecContext *avctx, void *data,
     uint8_t *buf = avpkt->data;
     int buf_size = avpkt->size;
     DVVideoContext *s = avctx->priv_data;
+    AVFrame *frame = data;
     const uint8_t *vsc_pack;
     int apt, is16_9, ret;
     const AVDVProfile *sys;
@@ -369,9 +370,9 @@ static int dvvideo_decode_frame(AVCodecContext *avctx, void *data,
         s->sys = sys;
     }
 
-    s->frame            = data;
-    s->frame->key_frame = 1;
-    s->frame->pict_type = AV_PICTURE_TYPE_I;
+    s->frame            = frame;
+    frame->key_frame    = 1;
+    frame->pict_type    = AV_PICTURE_TYPE_I;
     avctx->pix_fmt      = s->sys->pix_fmt;
     avctx->framerate    = av_inv_q(s->sys->time_base);
 
@@ -388,12 +389,12 @@ static int dvvideo_decode_frame(AVCodecContext *avctx, void *data,
         ff_set_sar(avctx, s->sys->sar[is16_9]);
     }
 
-    if (ff_get_buffer(avctx, s->frame, 0) < 0) {
+    if (ff_get_buffer(avctx, frame, 0) < 0) {
         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
         return -1;
     }
-    s->frame->interlaced_frame = 1;
-    s->frame->top_field_first  = 0;
+    frame->interlaced_frame = 1;
+    frame->top_field_first  = 0;
 
     s->buf = buf;
     avctx->execute(avctx, dv_decode_video_segment, s->work_chunks, NULL,