vp9-svc: Add decoder control to decode up to x spatial layers.

Change-Id: I85536473b8722424785c84c5b5520960b4e5744a

vp9/vp9_dx_iface.c

@@ -553,6 +553,9 @@ static vpx_codec_err_t decoder_decode(vpx_codec_alg_priv_t *ctx,
                                    ctx->decrypt_cb, ctx->decrypt_state);
   if (res != VPX_CODEC_OK) return res;
 
+  if (ctx->svc_decoding && ctx->svc_spatial_layer < frame_count - 1)
+    frame_count = ctx->svc_spatial_layer + 1;
+
   if (ctx->frame_parallel_decode) {
     // Decode in frame parallel mode. When decoding in this mode, the frame
     // passed to the decoder must be either a normal frame or a superframe with
@@ -1001,6 +1004,16 @@ static vpx_codec_err_t ctrl_set_skip_loop_filter(vpx_codec_alg_priv_t *ctx,
   return VPX_CODEC_OK;
 }
 
+static vpx_codec_err_t ctrl_set_spatial_layer_svc(vpx_codec_alg_priv_t *ctx,
+                                                  va_list args) {
+  ctx->svc_decoding = 1;
+  ctx->svc_spatial_layer = va_arg(args, int);
+  if (ctx->svc_spatial_layer < 0)
+    return VPX_CODEC_INVALID_PARAM;
+  else
+    return VPX_CODEC_OK;
+}
+
 static vpx_codec_ctrl_fn_map_t decoder_ctrl_maps[] = {
   { VP8_COPY_REFERENCE, ctrl_copy_reference },
 
@@ -1011,6 +1024,7 @@ static vpx_codec_ctrl_fn_map_t decoder_ctrl_maps[] = {
   { VPXD_SET_DECRYPTOR, ctrl_set_decryptor },
   { VP9_SET_BYTE_ALIGNMENT, ctrl_set_byte_alignment },
   { VP9_SET_SKIP_LOOP_FILTER, ctrl_set_skip_loop_filter },
+  { VP9_DECODE_SVC_SPATIAL_LAYER, ctrl_set_spatial_layer_svc },
 
   // Getters
   { VP8D_GET_LAST_REF_UPDATES, ctrl_get_last_ref_updates },

vp9/vp9_dx_iface.h

@@ -60,6 +60,10 @@ struct vpx_codec_alg_priv {
   void *ext_priv;  // Private data associated with the external frame buffers.
   vpx_get_frame_buffer_cb_fn_t get_ext_fb_cb;
   vpx_release_frame_buffer_cb_fn_t release_ext_fb_cb;
+
+  // Allow for decoding up to a given spatial layer for SVC stream.
+  int svc_decoding;
+  int svc_spatial_layer;
 };
 
 #endif  // VP9_VP9_DX_IFACE_H_

vpx/vp8dx.h

@@ -111,6 +111,11 @@ enum vp8_dec_control_id {
    */
   VP9_SET_SKIP_LOOP_FILTER,
 
+  /** control function to decode SVC stream up to the x spatial layers,
+   * where x is passed in through the control, and is 0 for base layer.
+   */
+  VP9_DECODE_SVC_SPATIAL_LAYER,
+
   VP8_DECODER_CTRL_ID_MAX
 };
 
@@ -162,6 +167,8 @@ VPX_CTRL_USE_TYPE(VP9D_GET_FRAME_SIZE, int *)
 #define VPX_CTRL_VP9D_GET_FRAME_SIZE
 VPX_CTRL_USE_TYPE(VP9_INVERT_TILE_DECODE_ORDER, int)
 #define VPX_CTRL_VP9_INVERT_TILE_DECODE_ORDER
+#define VPX_CTRL_VP9_DECODE_SVC_SPATIAL_LAYER
+VPX_CTRL_USE_TYPE(VP9_DECODE_SVC_SPATIAL_LAYER, int)
 
 /*!\endcond */
 /*! @} - end defgroup vp8_decoder */

vpxdec.c

@@ -92,31 +92,19 @@ static const arg_def_t md5arg =
 static const arg_def_t outbitdeptharg =
     ARG_DEF(NULL, "output-bit-depth", 1, "Output bit-depth for decoded frames");
 #endif
+static const arg_def_t svcdecodingarg = ARG_DEF(
+    NULL, "svc-decode-layer", 1, "Decode SVC stream up to given spatial layer");
 
-static const arg_def_t *all_args[] = { &codecarg,
-                                       &use_yv12,
-                                       &use_i420,
-                                       &flipuvarg,
-                                       &rawvideo,
-                                       &noblitarg,
-                                       &progressarg,
-                                       &limitarg,
-                                       &skiparg,
-                                       &postprocarg,
-                                       &summaryarg,
-                                       &outputfile,
-                                       &threadsarg,
-                                       &frameparallelarg,
-                                       &verbosearg,
-                                       &scalearg,
-                                       &fb_arg,
-                                       &md5arg,
-                                       &error_concealment,
-                                       &continuearg,
+static const arg_def_t *all_args[] = {
+  &codecarg,       &use_yv12,    &use_i420,   &flipuvarg,         &rawvideo,
+  &noblitarg,      &progressarg, &limitarg,   &skiparg,           &postprocarg,
+  &summaryarg,     &outputfile,  &threadsarg, &frameparallelarg,  &verbosearg,
+  &scalearg,       &fb_arg,      &md5arg,     &error_concealment, &continuearg,
 #if CONFIG_VP9_HIGHBITDEPTH
   &outbitdeptharg,
 #endif
-                                       NULL };
+  &svcdecodingarg, NULL
+};
 
 #if CONFIG_VP8_DECODER
 static const arg_def_t addnoise_level =
@@ -519,6 +507,8 @@ static int main_loop(int argc, const char **argv_) {
 #if CONFIG_VP9_HIGHBITDEPTH
   unsigned int output_bit_depth = 0;
 #endif
+  int svc_decoding = 0;
+  int svc_spatial_layer = 0;
 #if CONFIG_VP8_DECODER
   vp8_postproc_cfg_t vp8_pp_cfg = { 0, 0, 0 };
 #endif
@@ -610,6 +600,10 @@ static int main_loop(int argc, const char **argv_) {
       output_bit_depth = arg_parse_uint(&arg);
     }
 #endif
+    else if (arg_match(&arg, &svcdecodingarg, argi)) {
+      svc_decoding = 1;
+      svc_spatial_layer = arg_parse_uint(&arg);
+    }
 #if CONFIG_VP8_DECODER
     else if (arg_match(&arg, &addnoise_level, argi)) {
       postproc = 1;
@@ -726,7 +720,14 @@ static int main_loop(int argc, const char **argv_) {
             vpx_codec_error(&decoder));
     goto fail2;
   }
-
+  if (svc_decoding) {
+    if (vpx_codec_control(&decoder, VP9_DECODE_SVC_SPATIAL_LAYER,
+                          svc_spatial_layer)) {
+      fprintf(stderr, "Failed to set spatial layer for svc decode: %s\n",
+              vpx_codec_error(&decoder));
+      goto fail;
+    }
+  }
   if (!quiet) fprintf(stderr, "%s\n", decoder.name);
 
 #if CONFIG_VP8_DECODER