diff --git a/Cargo.lock b/Cargo.lock
index 83e207e7..80cc3963 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -80,6 +80,11 @@ name = "byte-slice-cast"
 version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "byte-slice-cast"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "byteorder"
 version = "1.2.4"
@@ -433,22 +438,21 @@ dependencies = [
 
 [[package]]
 name = "glib"
-version = "0.5.0"
+version = "0.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "glib-sys 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "gobject-sys 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glib-sys 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gobject-sys 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.42 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "glib-sys"
-version = "0.6.0"
+version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bitflags 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.42 (registry+https://github.com/rust-lang/crates.io-index)",
  "pkg-config 0.3.12 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -477,185 +481,180 @@ dependencies = [
 
 [[package]]
 name = "gobject-sys"
-version = "0.6.0"
+version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bitflags 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "glib-sys 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glib-sys 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.42 (registry+https://github.com/rust-lang/crates.io-index)",
  "pkg-config 0.3.12 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "gstreamer"
-version = "0.11.4"
+version = "0.12.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "cfg-if 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "glib 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "glib-sys 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "gobject-sys 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "gstreamer-sys 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glib 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glib-sys 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gobject-sys 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gstreamer-sys 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.42 (registry+https://github.com/rust-lang/crates.io-index)",
- "muldiv 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "num-rational 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
+ "muldiv 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-rational 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "gstreamer-app"
-version = "0.11.2"
+version = "0.12.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
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- "gstreamer-sys 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glib 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glib-sys 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gobject-sys 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gstreamer 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gstreamer-app-sys 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gstreamer-base 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gstreamer-base-sys 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gstreamer-sys 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.42 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
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-version = "0.5.0"
+version = "0.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
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- "gstreamer-sys 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glib-sys 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gstreamer-base-sys 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gstreamer-sys 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.42 (registry+https://github.com/rust-lang/crates.io-index)",
  "pkg-config 0.3.12 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
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-version = "0.11.3"
+version = "0.12.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
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- "gstreamer-sys 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glib 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glib-sys 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gobject-sys 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gstreamer 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gstreamer-audio-sys 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gstreamer-sys 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "gstreamer-audio-sys"
-version = "0.5.0"
+version = "0.6.0"
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- "gstreamer-sys 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glib-sys 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gobject-sys 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gstreamer-base-sys 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gstreamer-sys 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
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  "pkg-config 0.3.12 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
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 source = "registry+https://github.com/rust-lang/crates.io-index"
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- "gstreamer-sys 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glib 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glib-sys 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gobject-sys 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gstreamer 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gstreamer-base-sys 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gstreamer-sys 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
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-version = "0.5.0"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
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- "gstreamer-sys 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glib-sys 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gobject-sys 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gstreamer-sys 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.42 (registry+https://github.com/rust-lang/crates.io-index)",
  "pkg-config 0.3.12 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "gstreamer-player"
-version = "0.11.3"
+version = "0.12.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
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- "gstreamer-video 0.11.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glib 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glib-sys 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gobject-sys 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gstreamer 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gstreamer-player-sys 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gstreamer-sys 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
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 [[package]]
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-version = "0.5.0"
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+ "gstreamer-video-sys 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
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 [[package]]
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- "gobject-sys 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glib-sys 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gobject-sys 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.42 (registry+https://github.com/rust-lang/crates.io-index)",
  "pkg-config 0.3.12 (registry+https://github.com/rust-lang/crates.io-index)",
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 [[package]]
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- "gstreamer-video-sys 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glib 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glib-sys 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gobject-sys 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gstreamer 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gstreamer-base 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gstreamer-base-sys 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gstreamer-sys 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gstreamer-video-sys 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.42 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
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-version = "0.5.0"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
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- "gobject-sys 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "gstreamer-base-sys 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "gstreamer-sys 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glib-sys 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gobject-sys 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gstreamer-base-sys 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gstreamer-sys 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
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  "pkg-config 0.3.12 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -856,7 +855,7 @@ dependencies = [
 
 [[package]]
 name = "muldiv"
-version = "0.1.1"
+version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -896,7 +895,7 @@ dependencies = [
 
 [[package]]
 name = "num-rational"
-version = "0.1.42"
+version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "num-integer 0.1.39 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1178,12 +1177,12 @@ dependencies = [
 name = "servo-media-gstreamer"
 version = "0.1.0"
 dependencies = [
- "byte-slice-cast 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "glib 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "gstreamer 0.11.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "gstreamer-app 0.11.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "gstreamer-audio 0.11.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "gstreamer-player 0.11.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byte-slice-cast 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glib 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gstreamer 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gstreamer-app 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gstreamer-audio 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gstreamer-player 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "ipc-channel 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "servo-media-audio 0.1.0",
@@ -1554,6 +1553,7 @@ dependencies = [
 "checksum block 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "0d8c1fef690941d3e7788d328517591fecc684c084084702d6ff1641e993699a"
 "checksum build_const 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "39092a32794787acd8525ee150305ff051b0aa6cc2abaf193924f5ab05425f39"
 "checksum byte-slice-cast 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "5a865e7bfa6c3b79216ccba767d4dc66e4f9f65f1ed4639e73faff3c4a2485d7"
+"checksum byte-slice-cast 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "28346c117b50270785fbc123bd6e4ecad20d0c6d5f43d081dc80a3abcc62be64"
 "checksum byteorder 1.2.4 (registry+https://github.com/rust-lang/crates.io-index)" = "8389c509ec62b9fe8eca58c502a0acaf017737355615243496cde4994f8fa4f9"
 "checksum bzip2 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "42b7c3cbf0fa9c1b82308d57191728ca0256cb821220f4e2fd410a72ade26e3b"
 "checksum bzip2-sys 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "2c5162604199bbb17690ede847eaa6120a3f33d5ab4dcc8e7c25b16d849ae79b"
@@ -1595,22 +1595,22 @@ dependencies = [
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@@ -1633,12 +1633,12 @@ dependencies = [
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diff --git a/audio/src/buffer_source_node.rs b/audio/src/buffer_source_node.rs
index cab9f169..486f7444 100644
--- a/audio/src/buffer_source_node.rs
+++ b/audio/src/buffer_source_node.rs
@@ -216,6 +216,10 @@ impl AudioBuffer {
     pub fn chans(&self) -> u8 {
         self.buffers.len() as u8
     }
+
+    pub fn data_chan_mut(&mut self, chan: u8) -> &mut [f32] {
+        &mut self.buffers[chan as usize]
+    }
 }
 
 impl From<Vec<f32>> for AudioBuffer {