avcodec/mediacodec: add av_mediacodec_render_buffer_at_time()

The existing av_mediacodec_release_buffer allows the user to render
or discard the Surface-backed frame. This new method allows the user
to control exactly when the frame will be rendered to its SurfaceView.

Available since Android API 21.

Signed-off-by: Aman Gupta <aman@tmm1.net>

1 files changed, 21 insertions, 0 deletions

diff --git a/libavcodec/mediacodec.c b/libavcodec/mediacodec.c
index b0aae43..aa14624 100644
--- a/libavcodec/mediacodec.c
+++ b/libavcodec/mediacodec.c
@@ -102,6 +102,22 @@ int av_mediacodec_release_buffer(AVMediaCodecBuffer *buffer, int render)
     return 0;
 }
 
+int av_mediacodec_render_buffer_at_time(AVMediaCodecBuffer *buffer, int64_t time)
+{
+    MediaCodecDecContext *ctx = buffer->ctx;
+    int released = atomic_fetch_add(&buffer->released, 1);
+
+    if (!released && (ctx->delay_flush || buffer->serial == atomic_load(&ctx->serial))) {
+        atomic_fetch_sub(&ctx->hw_buffer_count, 1);
+        av_log(ctx->avctx, AV_LOG_DEBUG,
+               "Rendering output buffer %zd (%p) ts=%"PRId64" with time=%"PRId64" [%d pending]\n",
+               buffer->index, buffer, buffer->pts, time, atomic_load(&ctx->hw_buffer_count));
+        return ff_AMediaCodec_releaseOutputBufferAtTime(ctx->codec, buffer->index, time);
+    }
+
+    return 0;
+}
+
 #else
 
 #include <stdlib.h>
@@ -125,4 +141,9 @@ int av_mediacodec_release_buffer(AVMediaCodecBuffer *buffer, int render)
     return AVERROR(ENOSYS);
 }
 
+int av_mediacodec_render_buffer_at_time(AVMediaCodecBuffer *buffer, int64_t time)
+{
+    return AVERROR(ENOSYS);
+}
+
 #endif