Merge commit '182cf170'

* commit '182cf170':
  vp8: Return stream format information from parser

Return codes are adjusted to consume the whole packet in case of error
as the API does not allow returning AVERROR codes (a negative return
value is valid).
Merged-by: Clément Bœsch <u@pkh.me>

libavcodec/vp8_parser.c

 /*
- * Copyright (C) 2008 Michael Niedermayer
- *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
@@ -18,15 +16,56 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
-#include "parser.h"
+#include "libavutil/intreadwrite.h"
+
+#include "avcodec.h"
 
 static int parse(AVCodecParserContext *s,
                  AVCodecContext *avctx,
                  const uint8_t **poutbuf, int *poutbuf_size,
                  const uint8_t *buf, int buf_size)
 {
-    s->pict_type = (buf[0] & 0x01) ? AV_PICTURE_TYPE_P
-                                   : AV_PICTURE_TYPE_I;
+    unsigned int frame_type;
+    unsigned int profile;
+
+    if (buf_size < 3)
+        return buf_size;
+
+    frame_type = buf[0] & 1;
+    profile    = (buf[0] >> 1) & 7;
+    if (profile > 3) {
+        av_log(avctx, AV_LOG_ERROR, "Invalid profile %u.\n", profile);
+        return buf_size;
+    }
+
+    avctx->profile = profile;
+    s->key_frame   = frame_type == 0;
+    s->pict_type   = frame_type ? AV_PICTURE_TYPE_P : AV_PICTURE_TYPE_I;
+    s->format      = AV_PIX_FMT_YUV420P;
+    s->field_order = AV_FIELD_PROGRESSIVE;
+    s->picture_structure = AV_PICTURE_STRUCTURE_FRAME;
+
+    if (frame_type == 0) {
+        unsigned int sync_code;
+        unsigned int width, height;
+
+        if (buf_size < 10)
+            return buf_size;
+
+        sync_code = AV_RL24(buf + 3);
+        if (sync_code != 0x2a019d) {
+            av_log(avctx, AV_LOG_ERROR, "Invalid sync code %06x.\n", sync_code);
+            return buf_size;
+        }
+
+        width  = AV_RL16(buf + 6) & 0x3fff;
+        height = AV_RL16(buf + 8) & 0x3fff;
+
+        s->width        = width;
+        s->height       = height;
+        s->coded_width  = FFALIGN(width,  16);
+        s->coded_height = FFALIGN(height, 16);
+    }
 
     *poutbuf      = buf;
     *poutbuf_size = buf_size;