shithub: libvpx

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Implementing right flushing for simple_encoder.

simple_encoder: Flush encoder. According to the current API spec we need
to call vpx_codec_encode() until vpx_codec_get_cx_data() returns NULL.

Change-Id: Ibc37706e5257a3d51e5421ca17f77ab41249d9b5

--- a/examples/simple_encoder.c

+++ b/examples/simple_encoder.c

@@ -118,11 +118,12 @@

   exit(EXIT_FAILURE);

 }

-static void encode_frame(vpx_codec_ctx_t *codec,

-                         vpx_image_t *img,

-                         int frame_index,

-                         int flags,

-                         VpxVideoWriter *writer) {

+static int encode_frame(vpx_codec_ctx_t *codec,

+                        vpx_image_t *img,

+                        int frame_index,

+                        int flags,

+                        VpxVideoWriter *writer) {

+  int got_pkts = 0;

   vpx_codec_iter_t iter = NULL;

   const vpx_codec_cx_pkt_t *pkt = NULL;

   const vpx_codec_err_t res = vpx_codec_encode(codec, img, frame_index, 1,

@@ -131,6 +132,8 @@

     die_codec(codec, "Failed to encode frame");

   while ((pkt = vpx_codec_get_cx_data(codec, &iter)) != NULL) {

+    got_pkts = 1;

+

     if (pkt->kind == VPX_CODEC_CX_FRAME_PKT) {

       const int keyframe = (pkt->data.frame.flags & VPX_FRAME_IS_KEY) != 0;

       if (!vpx_video_writer_write_frame(writer,

@@ -139,11 +142,12 @@

                                         pkt->data.frame.pts)) {

         die_codec(codec, "Failed to write compressed frame");

       }

-

       printf(keyframe ? "K" : ".");

       fflush(stdout);

     }

   }

+

+  return got_pkts;

 }

 int main(int argc, char **argv) {

@@ -230,6 +234,7 @@

   if (vpx_codec_enc_init(&codec, encoder->codec_interface(), &cfg, 0))

     die_codec(&codec, "Failed to initialize encoder");

+  // Encode frames.

   while (vpx_img_read(&raw, infile)) {

     int flags = 0;

     if (keyframe_interval > 0 && frame_count % keyframe_interval == 0)

@@ -236,7 +241,9 @@

       flags |= VPX_EFLAG_FORCE_KF;

     encode_frame(&codec, &raw, frame_count++, flags, writer);

   }

-  encode_frame(&codec, NULL, -1, 0, writer);  // flush the encoder

+

+  // Flush encoder.

+  while (encode_frame(&codec, NULL, -1, 0, writer)) {};

   printf("\n");

   fclose(infile);