Add defines for audio offload and non-blocking write
- Defines audio output flags for offloaded playback of compressed
streams, and non-blocking HAL write()/drain()
- Adds audio_offload_info_t to pass additional information about a
compressed stream when offloading
Change-Id: I4592d0877edd39e68d0c1035d0652adbd397bf3a
Signed-off-by: Richard Fitzgerald <rf@opensource.wolfsonmicro.com>
Signed-off-by: Eric Laurent <elaurent@google.com>
diff --git a/include/system/audio.h b/include/system/audio.h
index da235dd..c49b0ee 100644
--- a/include/system/audio.h
+++ b/include/system/audio.h
@@ -383,9 +383,41 @@
// controls related to voice calls.
AUDIO_OUTPUT_FLAG_FAST = 0x4, // output supports "fast tracks",
// defined elsewhere
- AUDIO_OUTPUT_FLAG_DEEP_BUFFER = 0x8 // use deep audio buffers
+ AUDIO_OUTPUT_FLAG_DEEP_BUFFER = 0x8, // use deep audio buffers
+ AUDIO_OUTPUT_FLAG_COMPRESS_OFFLOAD = 0x10, // offload playback of compressed
+ // streams to hardware codec
+ AUDIO_OUTPUT_FLAG_NON_BLOCKING = 0x20 // use non-blocking write
} audio_output_flags_t;
+/* Additional information about compressed streams offloaded to
+ * hardware playback
+ * The version and size fields must be initialized by the caller by using
+ * one of the constants defined here.
+ */
+typedef struct {
+ uint16_t version; // version of the info structure
+ uint16_t size; // total size of the structure including version and size
+ uint32_t sample_rate; // sample rate in Hz
+ audio_channel_mask_t channel_mask; // channel mask
+ audio_format_t format; // audio format
+ audio_stream_type_t stream_type; // stream type
+ uint32_t bit_rate; // bit rate in bits per second
+ int64_t duration_us; // duration in microseconds, -1 if unknown
+ bool has_video; // true if stream is tied to a video stream
+ bool is_streaming; // true if streaming, false if local playback
+} audio_offload_info_t;
+
+#define AUDIO_MAKE_OFFLOAD_INFO_VERSION(maj,min) \
+ ((((maj) & 0xff) << 8) | ((min) & 0xff))
+
+#define AUDIO_OFFLOAD_INFO_VERSION_0_1 AUDIO_MAKE_OFFLOAD_INFO_VERSION(0, 1)
+#define AUDIO_OFFLOAD_INFO_VERSION_CURRENT AUDIO_OFFLOAD_INFO_VERSION_0_1
+
+static const audio_offload_info_t AUDIO_INFO_INITIALIZER = {
+ version: AUDIO_OFFLOAD_INFO_VERSION_CURRENT,
+ size: sizeof(audio_offload_info_t),
+};
+
static inline bool audio_is_output_device(audio_devices_t device)
{
if (((device & AUDIO_DEVICE_BIT_IN) == 0) &&