Merge commit 'b146d74730ab9ec5abede9066f770ad851e45fbc'

* commit 'b146d74730ab9ec5abede9066f770ad851e45fbc':
  indeo4: update AVCodecContext width/height on size change
  dfa: check that the caller set width/height properly.
  indeo5dec: Make sure we have had a valid gop header.
  cavsdec: check for changing w/h.
  lavc: set channel count from channel layout in avcodec_open2().
  doc/platform: Rework the Visual Studio linking section
  doc/faq: Change the Visual Studio entry to reflect current status
  doc/platform: Replace Visual Studio section with build instructions
  doc/platform: Nuke section on linking static MinGW-built libs with MSVC
  doc/platform: Remove false claim about MinGW installer
  doc/platform: Mention MinGW-w64
  dsputil_mmx: fix reading prior of the src array in sub_hfyu_median_prediction()
  mpegaudiodec: fix short_start calculation

Conflicts:
	doc/faq.texi
	doc/platform.texi
	libavcodec/cavsdec.c
	libavcodec/indeo5.c
	libavcodec/ivi_common.h

Merged-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/cavsdec.c

@@ -1073,11 +1073,12 @@ static int decode_seq_header(AVSContext *h) {
     h->profile =         get_bits(&s->gb,8);
     h->level =           get_bits(&s->gb,8);
     skip_bits1(&s->gb); //progressive sequence
-       width =           get_bits(&s->gb,14);
-       height =          get_bits(&s->gb,14);
+
+    width  = get_bits(&s->gb, 14);
+    height = get_bits(&s->gb, 14);
     if ((s->width || s->height) && (s->width != width || s->height != height)) {
         av_log_missing_feature(s, "Width/height changing in CAVS is", 0);
-        return -1;
+        return AVERROR_PATCHWELCOME;
     }
     if (width <= 0 || height <= 0) {
         av_log(s, AV_LOG_ERROR, "Dimensions invalid\n");
@@ -1085,6 +1086,7 @@ static int decode_seq_header(AVSContext *h) {
     }
     s->width  = width;
     s->height = height;
+
     skip_bits(&s->gb,2); //chroma format
     skip_bits(&s->gb,3); //sample_precision
     h->aspect_ratio =    get_bits(&s->gb,4);

libavcodec/dfa.c

@@ -22,6 +22,8 @@
 
 #include "avcodec.h"
 #include "bytestream.h"
+
+#include "libavutil/imgutils.h"
 #include "libavutil/lzo.h" // for av_memcpy_backptr
 
 typedef struct DfaContext {
@@ -34,9 +36,13 @@ typedef struct DfaContext {
 static av_cold int dfa_decode_init(AVCodecContext *avctx)
 {
     DfaContext *s = avctx->priv_data;
+    int ret;
 
     avctx->pix_fmt = PIX_FMT_PAL8;
 
+    if ((ret = av_image_check_size(avctx->width, avctx->height, 0, avctx)) < 0)
+        return ret;
+
     s->frame_buf = av_mallocz(avctx->width * avctx->height + AV_LZO_OUTPUT_PADDING);
     if (!s->frame_buf)
         return AVERROR(ENOMEM);

libavcodec/indeo5.c

@@ -321,8 +321,10 @@ static int decode_pic_hdr(IVI45DecContext *ctx, AVCodecContext *avctx)
 
     if (ctx->frame_type == FRAMETYPE_INTRA) {
         ctx->gop_invalid = 1;
-        if (decode_gop_header(ctx, avctx))
-            return -1;
+        if (decode_gop_header(ctx, avctx)) {
+            av_log(avctx, AV_LOG_ERROR, "Invalid GOP header, skipping frames.\n");
+            return AVERROR_INVALIDDATA;
+        }
         ctx->gop_invalid = 0;
     }
 

libavcodec/ivi_common.c

@@ -755,11 +755,13 @@ int ff_ivi_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
     ctx->frame_size = buf_size;
 
     result = ctx->decode_pic_hdr(ctx, avctx);
-    if (result || ctx->gop_invalid) {
+    if (result) {
         av_log(avctx, AV_LOG_ERROR,
                "Error while decoding picture header: %d\n", result);
         return -1;
     }
+    if (ctx->gop_invalid)
+        return AVERROR_INVALIDDATA;
 
     if (ctx->gop_flags & IVI5_IS_PROTECTED) {
         av_log(avctx, AV_LOG_ERROR, "Password-protected clip!\n");
@@ -805,8 +807,8 @@ int ff_ivi_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
     if (ctx->frame.data[0])
         avctx->release_buffer(avctx, &ctx->frame);
 
-    avcodec_set_dimensions(avctx, ctx->planes[0].width, ctx->planes[0].height);
     ctx->frame.reference = 0;
+    avcodec_set_dimensions(avctx, ctx->planes[0].width, ctx->planes[0].height);
     if ((result = avctx->get_buffer(avctx, &ctx->frame)) < 0) {
         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
         return result;

libavcodec/utils.c

@@ -1023,10 +1023,15 @@ int attribute_align_arg avcodec_open2(AVCodecContext *avctx, const AVCodec *code
         if (!avctx->bit_rate)
             avctx->bit_rate = get_bit_rate(avctx);
         /* validate channel layout from the decoder */
-        if (avctx->channel_layout &&
-            av_get_channel_layout_nb_channels(avctx->channel_layout) != avctx->channels) {
-            av_log(avctx, AV_LOG_WARNING, "channel layout does not match number of channels\n");
-            avctx->channel_layout = 0;
+        if (avctx->channel_layout) {
+            int channels = av_get_channel_layout_nb_channels(avctx->channel_layout);
+            if (!avctx->channels)
+                avctx->channels = channels;
+            else if (channels != avctx->channels) {
+                av_log(avctx, AV_LOG_WARNING,
+                       "channel layout does not match number of channels\n");
+                avctx->channel_layout = 0;
+            }
         }
     }
 end: