libvpx: Add VP9 decoder.

source/libvpx/vpx/src/vpx_encoder.c

 /*
  *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 
 /*!\file
  * \brief Provides the high level interface to wrap encoder algorithms.
  *
  */
 #include <limits.h>
 #include <string.h>
 #include "vpx/internal/vpx_codec_internal.h"
 #include "vpx_config.h"
 
 #define SAVE_STATUS(ctx,var) (ctx?(ctx->err = var):var)
 
 vpx_codec_err_t vpx_codec_enc_init_ver(vpx_codec_ctx_t      *ctx,
                                        vpx_codec_iface_t    *iface,
                                        vpx_codec_enc_cfg_t  *cfg,
                                        vpx_codec_flags_t     flags,
-                                       int                   ver)
-{
-    vpx_codec_err_t res;
+                                       int                   ver) {
+  vpx_codec_err_t res;
 
-    if (ver != VPX_ENCODER_ABI_VERSION)
-        res = VPX_CODEC_ABI_MISMATCH;
-    else if (!ctx || !iface || !cfg)
-        res = VPX_CODEC_INVALID_PARAM;
-    else if (iface->abi_version != VPX_CODEC_INTERNAL_ABI_VERSION)
-        res = VPX_CODEC_ABI_MISMATCH;
-    else if (!(iface->caps & VPX_CODEC_CAP_ENCODER))
-        res = VPX_CODEC_INCAPABLE;
-    else if ((flags & VPX_CODEC_USE_XMA) && !(iface->caps & VPX_CODEC_CAP_XMA))
-        res = VPX_CODEC_INCAPABLE;
-    else if ((flags & VPX_CODEC_USE_PSNR)
-             && !(iface->caps & VPX_CODEC_CAP_PSNR))
-        res = VPX_CODEC_INCAPABLE;
-    else if ((flags & VPX_CODEC_USE_OUTPUT_PARTITION)
-             && !(iface->caps & VPX_CODEC_CAP_OUTPUT_PARTITION))
-        res = VPX_CODEC_INCAPABLE;
-    else
-    {
-        ctx->iface = iface;
-        ctx->name = iface->name;
-        ctx->priv = NULL;
-        ctx->init_flags = flags;
-        ctx->config.enc = cfg;
-        res = ctx->iface->init(ctx, NULL);
+  if (ver != VPX_ENCODER_ABI_VERSION)
+    res = VPX_CODEC_ABI_MISMATCH;
+  else if (!ctx || !iface || !cfg)
+    res = VPX_CODEC_INVALID_PARAM;
+  else if (iface->abi_version != VPX_CODEC_INTERNAL_ABI_VERSION)
+    res = VPX_CODEC_ABI_MISMATCH;
+  else if (!(iface->caps & VPX_CODEC_CAP_ENCODER))
+    res = VPX_CODEC_INCAPABLE;
+  else if ((flags & VPX_CODEC_USE_XMA) && !(iface->caps & VPX_CODEC_CAP_XMA))
+    res = VPX_CODEC_INCAPABLE;
+  else if ((flags & VPX_CODEC_USE_PSNR)
+           && !(iface->caps & VPX_CODEC_CAP_PSNR))
+    res = VPX_CODEC_INCAPABLE;
+  else if ((flags & VPX_CODEC_USE_OUTPUT_PARTITION)
+           && !(iface->caps & VPX_CODEC_CAP_OUTPUT_PARTITION))
+    res = VPX_CODEC_INCAPABLE;
+  else {
+    ctx->iface = iface;
+    ctx->name = iface->name;
+    ctx->priv = NULL;
+    ctx->init_flags = flags;
+    ctx->config.enc = cfg;
+    res = ctx->iface->init(ctx, NULL);
 
-        if (res)
-        {
-            ctx->err_detail = ctx->priv ? ctx->priv->err_detail : NULL;
-            vpx_codec_destroy(ctx);
-        }
-
-        if (ctx->priv)
-            ctx->priv->iface = ctx->iface;
+    if (res) {
+      ctx->err_detail = ctx->priv ? ctx->priv->err_detail : NULL;
+      vpx_codec_destroy(ctx);
     }
 
-    return SAVE_STATUS(ctx, res);
+    if (ctx->priv)
+      ctx->priv->iface = ctx->iface;
+  }
+
+  return SAVE_STATUS(ctx, res);
 }
 
 vpx_codec_err_t vpx_codec_enc_init_multi_ver(vpx_codec_ctx_t      *ctx,
                                              vpx_codec_iface_t    *iface,
                                              vpx_codec_enc_cfg_t  *cfg,
                                              int                   num_enc,
                                              vpx_codec_flags_t     flags,
                                              vpx_rational_t       *dsf,
-                                             int                   ver)
-{
-    vpx_codec_err_t res = 0;
+                                             int                   ver) {
+  vpx_codec_err_t res = 0;
 
-    if (ver != VPX_ENCODER_ABI_VERSION)
-        res = VPX_CODEC_ABI_MISMATCH;
-    else if (!ctx || !iface || !cfg || (num_enc > 16 || num_enc < 1))
-        res = VPX_CODEC_INVALID_PARAM;
-    else if (iface->abi_version != VPX_CODEC_INTERNAL_ABI_VERSION)
-        res = VPX_CODEC_ABI_MISMATCH;
-    else if (!(iface->caps & VPX_CODEC_CAP_ENCODER))
-        res = VPX_CODEC_INCAPABLE;
-    else if ((flags & VPX_CODEC_USE_XMA) && !(iface->caps & VPX_CODEC_CAP_XMA))
-        res = VPX_CODEC_INCAPABLE;
-    else if ((flags & VPX_CODEC_USE_PSNR)
-             && !(iface->caps & VPX_CODEC_CAP_PSNR))
-        res = VPX_CODEC_INCAPABLE;
-    else if ((flags & VPX_CODEC_USE_OUTPUT_PARTITION)
-             && !(iface->caps & VPX_CODEC_CAP_OUTPUT_PARTITION))
-        res = VPX_CODEC_INCAPABLE;
-    else
-    {
-        int i;
-        void *mem_loc = NULL;
+  if (ver != VPX_ENCODER_ABI_VERSION)
+    res = VPX_CODEC_ABI_MISMATCH;
+  else if (!ctx || !iface || !cfg || (num_enc > 16 || num_enc < 1))
+    res = VPX_CODEC_INVALID_PARAM;
+  else if (iface->abi_version != VPX_CODEC_INTERNAL_ABI_VERSION)
+    res = VPX_CODEC_ABI_MISMATCH;
+  else if (!(iface->caps & VPX_CODEC_CAP_ENCODER))
+    res = VPX_CODEC_INCAPABLE;
+  else if ((flags & VPX_CODEC_USE_XMA) && !(iface->caps & VPX_CODEC_CAP_XMA))
+    res = VPX_CODEC_INCAPABLE;
+  else if ((flags & VPX_CODEC_USE_PSNR)
+           && !(iface->caps & VPX_CODEC_CAP_PSNR))
+    res = VPX_CODEC_INCAPABLE;
+  else if ((flags & VPX_CODEC_USE_OUTPUT_PARTITION)
+           && !(iface->caps & VPX_CODEC_CAP_OUTPUT_PARTITION))
+    res = VPX_CODEC_INCAPABLE;
+  else {
+    int i;
+    void *mem_loc = NULL;
 
-        if(!(res = iface->enc.mr_get_mem_loc(cfg, &mem_loc)))
-        {
-            for (i = 0; i < num_enc; i++)
-            {
-                vpx_codec_priv_enc_mr_cfg_t mr_cfg;
+    if (!(res = iface->enc.mr_get_mem_loc(cfg, &mem_loc))) {
+      for (i = 0; i < num_enc; i++) {
+        vpx_codec_priv_enc_mr_cfg_t mr_cfg;
 
-                /* Validate down-sampling factor. */
-                if(dsf->num < 1 || dsf->num > 4096 || dsf->den < 1 ||
-                   dsf->den > dsf->num)
-                {
-                    res = VPX_CODEC_INVALID_PARAM;
-                    break;
-                }
+        /* Validate down-sampling factor. */
+        if (dsf->num < 1 || dsf->num > 4096 || dsf->den < 1 ||
+            dsf->den > dsf->num) {
+          res = VPX_CODEC_INVALID_PARAM;
+          break;
+        }
 
-                mr_cfg.mr_low_res_mode_info = mem_loc;
-                mr_cfg.mr_total_resolutions = num_enc;
-                mr_cfg.mr_encoder_id = num_enc-1-i;
-                mr_cfg.mr_down_sampling_factor.num = dsf->num;
-                mr_cfg.mr_down_sampling_factor.den = dsf->den;
+        mr_cfg.mr_low_res_mode_info = mem_loc;
+        mr_cfg.mr_total_resolutions = num_enc;
+        mr_cfg.mr_encoder_id = num_enc - 1 - i;
+        mr_cfg.mr_down_sampling_factor.num = dsf->num;
+        mr_cfg.mr_down_sampling_factor.den = dsf->den;
 
-                /* Force Key-frame synchronization. Namely, encoder at higher
-                 * resolution always use the same frame_type chosen by the
-                 * lowest-resolution encoder.
-                 */
-                if(mr_cfg.mr_encoder_id)
-                    cfg->kf_mode = VPX_KF_DISABLED;
+        /* Force Key-frame synchronization. Namely, encoder at higher
+         * resolution always use the same frame_type chosen by the
+         * lowest-resolution encoder.
+         */
+        if (mr_cfg.mr_encoder_id)
+          cfg->kf_mode = VPX_KF_DISABLED;
 
-                ctx->iface = iface;
-                ctx->name = iface->name;
-                ctx->priv = NULL;
-                ctx->init_flags = flags;
-                ctx->config.enc = cfg;
-                res = ctx->iface->init(ctx, &mr_cfg);
+        ctx->iface = iface;
+        ctx->name = iface->name;
+        ctx->priv = NULL;
+        ctx->init_flags = flags;
+        ctx->config.enc = cfg;
+        res = ctx->iface->init(ctx, &mr_cfg);
 
-                if (res)
-                {
-                    const char *error_detail =
-                        ctx->priv ? ctx->priv->err_detail : NULL;
-                    /* Destroy current ctx */
-                    ctx->err_detail = error_detail;
-                    vpx_codec_destroy(ctx);
+        if (res) {
+          const char *error_detail =
+            ctx->priv ? ctx->priv->err_detail : NULL;
+          /* Destroy current ctx */
+          ctx->err_detail = error_detail;
+          vpx_codec_destroy(ctx);
 
-                    /* Destroy already allocated high-level ctx */
-                    while (i)
-                    {
-                        ctx--;
-                        ctx->err_detail = error_detail;
-                        vpx_codec_destroy(ctx);
-                        i--;
-                    }
-                }
+          /* Destroy already allocated high-level ctx */
+          while (i) {
+            ctx--;
+            ctx->err_detail = error_detail;
+            vpx_codec_destroy(ctx);
+            i--;
+          }
+        }
 
-                if (ctx->priv)
-                    ctx->priv->iface = ctx->iface;
+        if (ctx->priv)
+          ctx->priv->iface = ctx->iface;
 
-                if (res)
-                    break;
+        if (res)
+          break;
 
-                ctx++;
-                cfg++;
-                dsf++;
-            }
-        }
+        ctx++;
+        cfg++;
+        dsf++;
+      }
     }
+  }
 
-    return SAVE_STATUS(ctx, res);
+  return SAVE_STATUS(ctx, res);
 }
 
 
 vpx_codec_err_t  vpx_codec_enc_config_default(vpx_codec_iface_t    *iface,
-        vpx_codec_enc_cfg_t  *cfg,
-        unsigned int          usage)
-{
-    vpx_codec_err_t res;
-    vpx_codec_enc_cfg_map_t *map;
+                                              vpx_codec_enc_cfg_t  *cfg,
+                                              unsigned int          usage) {
+  vpx_codec_err_t res;
+  vpx_codec_enc_cfg_map_t *map;
 
-    if (!iface || !cfg || usage > INT_MAX)
-        res = VPX_CODEC_INVALID_PARAM;
-    else if (!(iface->caps & VPX_CODEC_CAP_ENCODER))
-        res = VPX_CODEC_INCAPABLE;
-    else
-    {
-        res = VPX_CODEC_INVALID_PARAM;
+  if (!iface || !cfg || usage > INT_MAX)
+    res = VPX_CODEC_INVALID_PARAM;
+  else if (!(iface->caps & VPX_CODEC_CAP_ENCODER))
+    res = VPX_CODEC_INCAPABLE;
+  else {
+    res = VPX_CODEC_INVALID_PARAM;
 
-        for (map = iface->enc.cfg_maps; map->usage >= 0; map++)
-        {
-            if (map->usage == (int)usage)
-            {
-                *cfg = map->cfg;
-                cfg->g_usage = usage;
-                res = VPX_CODEC_OK;
-                break;
-            }
-        }
+    for (map = iface->enc.cfg_maps; map->usage >= 0; map++) {
+      if (map->usage == (int)usage) {
+        *cfg = map->cfg;
+        cfg->g_usage = usage;
+        res = VPX_CODEC_OK;
+        break;
+      }
     }
+  }
 
-    return res;
+  return res;
 }
 
 
 #if ARCH_X86 || ARCH_X86_64
 /* On X86, disable the x87 unit's internal 80 bit precision for better
  * consistency with the SSE unit's 64 bit precision.
  */
 #include "vpx_ports/x86.h"
 #define FLOATING_POINT_INIT() do {\
-        unsigned short x87_orig_mode = x87_set_double_precision();
+    unsigned short x87_orig_mode = x87_set_double_precision();
 #define FLOATING_POINT_RESTORE() \
-    x87_set_control_word(x87_orig_mode); }while(0)
+  x87_set_control_word(x87_orig_mode); }while(0)
 
 
 #else
 static void FLOATING_POINT_INIT() {}
 static void FLOATING_POINT_RESTORE() {}
 #endif
 
 
 vpx_codec_err_t  vpx_codec_encode(vpx_codec_ctx_t            *ctx,
                                   const vpx_image_t          *img,
                                   vpx_codec_pts_t             pts,
                                   unsigned long               duration,
                                   vpx_enc_frame_flags_t       flags,
-                                  unsigned long               deadline)
-{
-    vpx_codec_err_t res = 0;
-
-    if (!ctx || (img && !duration))
-        res = VPX_CODEC_INVALID_PARAM;
+                                  unsigned long               deadline) {
+  vpx_codec_err_t res = 0;
+
+  if (!ctx || (img && !duration))
+    res = VPX_CODEC_INVALID_PARAM;
+  else if (!ctx->iface || !ctx->priv)
+    res = VPX_CODEC_ERROR;
+  else if (!(ctx->iface->caps & VPX_CODEC_CAP_ENCODER))
+    res = VPX_CODEC_INCAPABLE;
+  else {
+    /* Execute in a normalized floating point environment, if the platform
+     * requires it.
+     */
+    unsigned int num_enc = ctx->priv->enc.total_encoders;
+
+    FLOATING_POINT_INIT();
+
+    if (num_enc == 1)
+      res = ctx->iface->enc.encode(ctx->priv->alg_priv, img, pts,
+                                   duration, flags, deadline);
+    else {
+      /* Multi-resolution encoding:
+       * Encode multi-levels in reverse order. For example,
+       * if mr_total_resolutions = 3, first encode level 2,
+       * then encode level 1, and finally encode level 0.
+       */
+      int i;
+
+      ctx += num_enc - 1;
+      if (img) img += num_enc - 1;
+
+      for (i = num_enc - 1; i >= 0; i--) {
+        if ((res = ctx->iface->enc.encode(ctx->priv->alg_priv, img, pts,
+                                          duration, flags, deadline)))
+          break;
+
+        ctx--;
+        if (img) img--;
+      }
+      ctx++;
+    }
+
+    FLOATING_POINT_RESTORE();
+  }
+
+  return SAVE_STATUS(ctx, res);
+}
+
+
+const vpx_codec_cx_pkt_t *vpx_codec_get_cx_data(vpx_codec_ctx_t   *ctx,
+                                                vpx_codec_iter_t  *iter) {
+  const vpx_codec_cx_pkt_t *pkt = NULL;
+
+  if (ctx) {
+    if (!iter)
+      ctx->err = VPX_CODEC_INVALID_PARAM;
     else if (!ctx->iface || !ctx->priv)
-        res = VPX_CODEC_ERROR;
+      ctx->err = VPX_CODEC_ERROR;
     else if (!(ctx->iface->caps & VPX_CODEC_CAP_ENCODER))
-        res = VPX_CODEC_INCAPABLE;
+      ctx->err = VPX_CODEC_INCAPABLE;
     else
-    {
-        /* Execute in a normalized floating point environment, if the platform
-         * requires it.
-         */
-        unsigned int num_enc =ctx->priv->enc.total_encoders;
-
-        FLOATING_POINT_INIT();
-
-        if (num_enc == 1)
-            res = ctx->iface->enc.encode(ctx->priv->alg_priv, img, pts,
-                                         duration, flags, deadline);
-        else
-        {
-            /* Multi-resolution encoding:
-             * Encode multi-levels in reverse order. For example,
-             * if mr_total_resolutions = 3, first encode level 2,
-             * then encode level 1, and finally encode level 0.
-             */
-            int i;
-
-            ctx += num_enc - 1;
-            if (img) img += num_enc - 1;
-
-            for (i = num_enc-1; i >= 0; i--)
-            {
-                if ((res = ctx->iface->enc.encode(ctx->priv->alg_priv, img, pts,
-                                                  duration, flags, deadline)))
-                    break;
-
-                ctx--;
-                if (img) img--;
-            }
-            ctx++;
-        }
-
-        FLOATING_POINT_RESTORE();
+      pkt = ctx->iface->enc.get_cx_data(ctx->priv->alg_priv, iter);
+  }
+
+  if (pkt && pkt->kind == VPX_CODEC_CX_FRAME_PKT) {
+    /* If the application has specified a destination area for the
+     * compressed data, and the codec has not placed the data there,
+     * and it fits, copy it.
+     */
+    char *dst_buf = ctx->priv->enc.cx_data_dst_buf.buf;
+
+    if (dst_buf
+        && pkt->data.raw.buf != dst_buf
+        && pkt->data.raw.sz
+        + ctx->priv->enc.cx_data_pad_before
+        + ctx->priv->enc.cx_data_pad_after
+        <= ctx->priv->enc.cx_data_dst_buf.sz) {
+      vpx_codec_cx_pkt_t *modified_pkt = &ctx->priv->enc.cx_data_pkt;
+
+      memcpy(dst_buf + ctx->priv->enc.cx_data_pad_before,
+             pkt->data.raw.buf, pkt->data.raw.sz);
+      *modified_pkt = *pkt;
+      modified_pkt->data.raw.buf = dst_buf;
+      modified_pkt->data.raw.sz += ctx->priv->enc.cx_data_pad_before
+                                   + ctx->priv->enc.cx_data_pad_after;
+      pkt = modified_pkt;
     }
 
-    return SAVE_STATUS(ctx, res);
-}
-
-
-const vpx_codec_cx_pkt_t *vpx_codec_get_cx_data(vpx_codec_ctx_t   *ctx,
-        vpx_codec_iter_t  *iter)
-{
-    const vpx_codec_cx_pkt_t *pkt = NULL;
-
-    if (ctx)
-    {
-        if (!iter)
-            ctx->err = VPX_CODEC_INVALID_PARAM;
-        else if (!ctx->iface || !ctx->priv)
-            ctx->err = VPX_CODEC_ERROR;
-        else if (!(ctx->iface->caps & VPX_CODEC_CAP_ENCODER))
-            ctx->err = VPX_CODEC_INCAPABLE;
-        else
-            pkt = ctx->iface->enc.get_cx_data(ctx->priv->alg_priv, iter);
+    if (dst_buf == pkt->data.raw.buf) {
+      ctx->priv->enc.cx_data_dst_buf.buf = dst_buf + pkt->data.raw.sz;
+      ctx->priv->enc.cx_data_dst_buf.sz -= pkt->data.raw.sz;
     }
-
-    if (pkt && pkt->kind == VPX_CODEC_CX_FRAME_PKT)
-    {
-        /* If the application has specified a destination area for the
-         * compressed data, and the codec has not placed the data there,
-         * and it fits, copy it.
-         */
-        char *dst_buf = ctx->priv->enc.cx_data_dst_buf.buf;
-
-        if (dst_buf
-            && pkt->data.raw.buf != dst_buf
-            && pkt->data.raw.sz
-            + ctx->priv->enc.cx_data_pad_before
-            + ctx->priv->enc.cx_data_pad_after
-            <= ctx->priv->enc.cx_data_dst_buf.sz)
-        {
-            vpx_codec_cx_pkt_t *modified_pkt = &ctx->priv->enc.cx_data_pkt;
-
-            memcpy(dst_buf + ctx->priv->enc.cx_data_pad_before,
-                   pkt->data.raw.buf, pkt->data.raw.sz);
-            *modified_pkt = *pkt;
-            modified_pkt->data.raw.buf = dst_buf;
-            modified_pkt->data.raw.sz += ctx->priv->enc.cx_data_pad_before
-                                         + ctx->priv->enc.cx_data_pad_after;
-            pkt = modified_pkt;
-        }
-
-        if (dst_buf == pkt->data.raw.buf)
-        {
-            ctx->priv->enc.cx_data_dst_buf.buf = dst_buf + pkt->data.raw.sz;
-            ctx->priv->enc.cx_data_dst_buf.sz -= pkt->data.raw.sz;
-        }
-    }
-
-    return pkt;
+  }
+
+  return pkt;
 }
 
 
 vpx_codec_err_t vpx_codec_set_cx_data_buf(vpx_codec_ctx_t       *ctx,
-        const vpx_fixed_buf_t *buf,
-        unsigned int           pad_before,
-        unsigned int           pad_after)
-{
-    if (!ctx || !ctx->priv)
-        return VPX_CODEC_INVALID_PARAM;
-
-    if (buf)
-    {
-        ctx->priv->enc.cx_data_dst_buf = *buf;
-        ctx->priv->enc.cx_data_pad_before = pad_before;
-        ctx->priv->enc.cx_data_pad_after = pad_after;
-    }
+                                          const vpx_fixed_buf_t *buf,
+                                          unsigned int           pad_before,
+                                          unsigned int           pad_after) {
+  if (!ctx || !ctx->priv)
+    return VPX_CODEC_INVALID_PARAM;
+
+  if (buf) {
+    ctx->priv->enc.cx_data_dst_buf = *buf;
+    ctx->priv->enc.cx_data_pad_before = pad_before;
+    ctx->priv->enc.cx_data_pad_after = pad_after;
+  } else {
+    ctx->priv->enc.cx_data_dst_buf.buf = NULL;
+    ctx->priv->enc.cx_data_dst_buf.sz = 0;
+    ctx->priv->enc.cx_data_pad_before = 0;
+    ctx->priv->enc.cx_data_pad_after = 0;
+  }
+
+  return VPX_CODEC_OK;
+}
+
+
+const vpx_image_t *vpx_codec_get_preview_frame(vpx_codec_ctx_t   *ctx) {
+  vpx_image_t *img = NULL;
+
+  if (ctx) {
+    if (!ctx->iface || !ctx->priv)
+      ctx->err = VPX_CODEC_ERROR;
+    else if (!(ctx->iface->caps & VPX_CODEC_CAP_ENCODER))
+      ctx->err = VPX_CODEC_INCAPABLE;
+    else if (!ctx->iface->enc.get_preview)
+      ctx->err = VPX_CODEC_INCAPABLE;
     else
-    {
-        ctx->priv->enc.cx_data_dst_buf.buf = NULL;
-        ctx->priv->enc.cx_data_dst_buf.sz = 0;
-        ctx->priv->enc.cx_data_pad_before = 0;
-        ctx->priv->enc.cx_data_pad_after = 0;
-    }
-
-    return VPX_CODEC_OK;
-}
-
-
-const vpx_image_t *vpx_codec_get_preview_frame(vpx_codec_ctx_t   *ctx)
-{
-    vpx_image_t *img = NULL;
-
-    if (ctx)
-    {
-        if (!ctx->iface || !ctx->priv)
-            ctx->err = VPX_CODEC_ERROR;
-        else if (!(ctx->iface->caps & VPX_CODEC_CAP_ENCODER))
-            ctx->err = VPX_CODEC_INCAPABLE;
-        else if (!ctx->iface->enc.get_preview)
-            ctx->err = VPX_CODEC_INCAPABLE;
-        else
-            img = ctx->iface->enc.get_preview(ctx->priv->alg_priv);
-    }
-
-    return img;
-}
-
-
-vpx_fixed_buf_t *vpx_codec_get_global_headers(vpx_codec_ctx_t   *ctx)
-{
-    vpx_fixed_buf_t *buf = NULL;
-
-    if (ctx)
-    {
-        if (!ctx->iface || !ctx->priv)
-            ctx->err = VPX_CODEC_ERROR;
-        else if (!(ctx->iface->caps & VPX_CODEC_CAP_ENCODER))
-            ctx->err = VPX_CODEC_INCAPABLE;
-        else if (!ctx->iface->enc.get_glob_hdrs)
-            ctx->err = VPX_CODEC_INCAPABLE;
-        else
-            buf = ctx->iface->enc.get_glob_hdrs(ctx->priv->alg_priv);
-    }
-
-    return buf;
+      img = ctx->iface->enc.get_preview(ctx->priv->alg_priv);
+  }
+
+  return img;
+}
+
+
+vpx_fixed_buf_t *vpx_codec_get_global_headers(vpx_codec_ctx_t   *ctx) {
+  vpx_fixed_buf_t *buf = NULL;
+
+  if (ctx) {
+    if (!ctx->iface || !ctx->priv)
+      ctx->err = VPX_CODEC_ERROR;
+    else if (!(ctx->iface->caps & VPX_CODEC_CAP_ENCODER))
+      ctx->err = VPX_CODEC_INCAPABLE;
+    else if (!ctx->iface->enc.get_glob_hdrs)
+      ctx->err = VPX_CODEC_INCAPABLE;
+    else
+      buf = ctx->iface->enc.get_glob_hdrs(ctx->priv->alg_priv);
+  }
+
+  return buf;
 }
 
 
 vpx_codec_err_t  vpx_codec_enc_config_set(vpx_codec_ctx_t            *ctx,
-        const vpx_codec_enc_cfg_t  *cfg)
-{
-    vpx_codec_err_t res;
-
-    if (!ctx || !ctx->iface || !ctx->priv || !cfg)
-        res = VPX_CODEC_INVALID_PARAM;
-    else if (!(ctx->iface->caps & VPX_CODEC_CAP_ENCODER))
-        res = VPX_CODEC_INCAPABLE;
-    else
-        res = ctx->iface->enc.cfg_set(ctx->priv->alg_priv, cfg);
-
-    return SAVE_STATUS(ctx, res);
+                                          const vpx_codec_enc_cfg_t  *cfg) {
+  vpx_codec_err_t res;
+
+  if (!ctx || !ctx->iface || !ctx->priv || !cfg)
+    res = VPX_CODEC_INVALID_PARAM;
+  else if (!(ctx->iface->caps & VPX_CODEC_CAP_ENCODER))
+    res = VPX_CODEC_INCAPABLE;
+  else
+    res = ctx->iface->enc.cfg_set(ctx->priv->alg_priv, cfg);
+
+  return SAVE_STATUS(ctx, res);
 }
 
 
 int vpx_codec_pkt_list_add(struct vpx_codec_pkt_list *list,
-                           const struct vpx_codec_cx_pkt *pkt)
-{
-    if (list->cnt < list->max)
-    {
-        list->pkts[list->cnt++] = *pkt;
-        return 0;
-    }
-
-    return 1;
+                           const struct vpx_codec_cx_pkt *pkt) {
+  if (list->cnt < list->max) {
+    list->pkts[list->cnt++] = *pkt;
+    return 0;
+  }
+
+  return 1;
 }
 
 
 const vpx_codec_cx_pkt_t *vpx_codec_pkt_list_get(struct vpx_codec_pkt_list *list,
-        vpx_codec_iter_t           *iter)
-{
-    const vpx_codec_cx_pkt_t *pkt;
-
-    if (!(*iter))
-    {
-        *iter = list->pkts;
-    }
-
-    pkt = (const void *) * iter;
-
-    if ((size_t)(pkt - list->pkts) < list->cnt)
-        *iter = pkt + 1;
-    else
-        pkt = NULL;
-
-    return pkt;
-}
+                                                 vpx_codec_iter_t           *iter) {
+  const vpx_codec_cx_pkt_t *pkt;
+
+  if (!(*iter)) {
+    *iter = list->pkts;
+  }
+
+  pkt = (const void *) * iter;
+
+  if ((size_t)(pkt - list->pkts) < list->cnt)
+    *iter = pkt + 1;
+  else
+    pkt = NULL;
+
+  return pkt;
+}