Merge remote-tracking branch 'qatar/release/0.8' into release/0.10

* qatar/release/0.8: (154 commits)
  Update Changelog for the 0.8.1 Release
  dca: include libavutil/mathematics.h for possibly missing M_SQRT1_2
  dca: don't use av_clip_uintp2().
  snow: check reference frame indices.
  snow: reject unsupported chroma shifts.
  xa_adpcm: limit filter to prevent xa_adpcm_table[] array bounds overruns.
  h264: increase reference poc list from 16 to 32.
  h264: stricter reference limit enforcement.
  h264: improve parsing of broken AVC SPS
  Replace computations of remaining bits with calls to get_bits_left().
  png: convert to bytestream2 API.
  roqvideo: convert to bytestream2 API.
  smc: port to bytestream2 API.
  tgq: convert to bytestream2 API.
  algmm: convert to bytestream2 API.
  jvdec: unbreak video decoding
  h264: Fix invalid interlaced/progressive MB combinations for direct mode prediction.
  libx264: add 'stats' private option for setting 2pass stats filename.
  libx264: fix help text for slice-max-size option.
  avconv: reindent
  ...

Conflicts:
	Changelog
	RELEASE
	avconv.c
	doc/APIchanges
	ffplay.c
	libavcodec/Makefile
	libavcodec/aacdec.c
	libavcodec/alsdec.c
	libavcodec/atrac3.c
	libavcodec/avcodec.h
	libavcodec/dvdata.c
	libavcodec/fraps.c
	libavcodec/golomb.h
	libavcodec/h264.c
	libavcodec/h264.h
	libavcodec/h264_cabac.c
	libavcodec/h264_cavlc.c
	libavcodec/h264_direct.c
	libavcodec/h264_parser.c
	libavcodec/h264_ps.c
	libavcodec/h264idct_template.c
	libavcodec/indeo3.c
	libavcodec/kgv1dec.c
	libavcodec/kmvc.c
	libavcodec/mjpegbdec.c
	libavcodec/mmvideo.c
	libavcodec/mpegaudiodec.c
	libavcodec/mpegvideo.h
	libavcodec/options.c
	libavcodec/pngdec.c
	libavcodec/roqvideodec.c
	libavcodec/shorten.c
	libavcodec/svq3.c
	libavcodec/utils.c
	libavcodec/version.h
	libavcodec/wmadec.c
	libavcodec/xxan.c
	libavformat/Makefile
	libavformat/asfdec.c
	libavformat/dv.c
	libavformat/mov.c
	libavformat/nsvdec.c
	libavformat/utils.c
	libavformat/version.h
	libavutil/avutil.h
	libavutil/error.c
	libavutil/error.h
	libswscale/swscale.c
	libswscale/utils.c
	libswscale/x86/swscale_template.c
	tests/ref/acodec/g722

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

libavcodec/utils.c

@@ -703,6 +703,21 @@ int attribute_align_arg avcodec_open2(AVCodecContext *avctx, AVCodec *codec, AVD
     int ret = 0;
     AVDictionary *tmp = NULL;
 
+    if (avcodec_is_open(avctx))
+        return 0;
+
+    if ((!codec && !avctx->codec)) {
+        av_log(avctx, AV_LOG_ERROR, "No codec provided to avcodec_open2().\n");
+        return AVERROR(EINVAL);
+    }
+    if ((codec && avctx->codec && codec != avctx->codec)) {
+        av_log(avctx, AV_LOG_ERROR, "This AVCodecContext was allocated for %s, "
+               "but %s passed to avcodec_open2().\n", avctx->codec->name, codec->name);
+        return AVERROR(EINVAL);
+    }
+    if (!codec)
+        codec = avctx->codec;
+
     if (avctx->extradata_size < 0 || avctx->extradata_size >= FF_MAX_EXTRADATA_SIZE)
         return AVERROR(EINVAL);
 
@@ -722,11 +737,6 @@ int attribute_align_arg avcodec_open2(AVCodecContext *avctx, AVCodec *codec, AVD
         goto end;
     }
 
-    if(avctx->codec || !codec) {
-        ret = AVERROR(EINVAL);
-        goto end;
-    }
-
     avctx->internal = av_mallocz(sizeof(AVCodecInternal));
     if (!avctx->internal) {
         ret = AVERROR(ENOMEM);
@@ -816,6 +826,12 @@ int attribute_align_arg avcodec_open2(AVCodecContext *avctx, AVCodec *codec, AVD
            avctx->error_recognition, avctx->err_recognition);
 #endif
 
+    if (avctx->codec_type == AVMEDIA_TYPE_AUDIO &&
+        (!avctx->time_base.num || !avctx->time_base.den)) {
+        avctx->time_base.num = 1;
+        avctx->time_base.den = avctx->sample_rate;
+    }
+
     if (!HAVE_THREADS)
         av_log(avctx, AV_LOG_WARNING, "Warning: not compiled with thread support, using thread emulation\n");
 
@@ -1421,14 +1437,17 @@ av_cold int avcodec_close(AVCodecContext *avctx)
         return -1;
     }
 
-    if (HAVE_THREADS && avctx->thread_opaque)
-        ff_thread_free(avctx);
-    if (avctx->codec && avctx->codec->close)
-        avctx->codec->close(avctx);
-    avcodec_default_free_buffers(avctx);
-    avctx->coded_frame = NULL;
-    av_freep(&avctx->internal);
-    if (avctx->codec && avctx->codec->priv_class)
+    if (avcodec_is_open(avctx)) {
+        if (HAVE_THREADS && avctx->thread_opaque)
+            ff_thread_free(avctx);
+        if (avctx->codec && avctx->codec->close)
+            avctx->codec->close(avctx);
+        avcodec_default_free_buffers(avctx);
+        avctx->coded_frame = NULL;
+        av_freep(&avctx->internal);
+    }
+
+    if (avctx->priv_data && avctx->codec && avctx->codec->priv_class)
         av_opt_free(avctx->priv_data);
     av_opt_free(avctx);
     av_freep(&avctx->priv_data);
@@ -2009,3 +2028,8 @@ enum AVMediaType avcodec_get_type(enum CodecID codec_id)
 
     return AVMEDIA_TYPE_UNKNOWN;
 }
+
+int avcodec_is_open(AVCodecContext *s)
+{
+    return !!s->internal;
+}