debian/patches: new FFmpeg-5.0-compatibility.patch

[libam7xxx.git] / examples / am7xxx-play.c

diff --git a/examples/am7xxx-play.c b/examples/am7xxx-play.c
index 4987c62..81aff84 100644 (file)
--- a/examples/am7xxx-play.c
+++ b/examples/am7xxx-play.c
@@ -211,6 +211,7 @@ static int video_output_init(struct video_output_ctx *output_ctx,
                goto out;
        }
 
+       /* YUVJ420P is deprecated in swscaler, but mjpeg still relies on it. */
        output_codec_ctx->pix_fmt    = AV_PIX_FMT_YUVJ420P;
        output_codec_ctx->codec_id   = AV_CODEC_ID_MJPEG;
        output_codec_ctx->codec_type = AVMEDIA_TYPE_VIDEO;
@@ -256,6 +257,67 @@ out:
 }
 
 
+/*
+ * Wrap the new avcodec API from FFMpeg 3.1 to minimize the changes in the
+ * user code.
+ *
+ * If the use of the wrappers were to be made conditional, a check like the
+ * following could be used:
+ *
+ *     #if (LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(57, 48, 101))
+ *
+ * As derived from the APIchanges document:
+ * https://github.com/FFmpeg/FFmpeg/blob/master/doc/APIchanges
+ *
+ * The wrapper implementation has been taken from:
+ * https://blogs.gentoo.org/lu_zero/2016/03/29/new-avcodec-api/
+ */
+static int decode(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *pkt)
+{
+       int ret;
+
+       *got_frame = 0;
+
+       if (pkt) {
+               ret = avcodec_send_packet(avctx, pkt);
+               /*
+                * In particular, we don't expect AVERROR(EAGAIN), because we
+                * read all decoded frames with avcodec_receive_frame() until
+                * done.
+                */
+               if (ret < 0)
+                       return ret == AVERROR_EOF ? 0 : ret;
+       }
+
+       ret = avcodec_receive_frame(avctx, frame);
+       if (ret < 0 && ret != AVERROR(EAGAIN) && ret != AVERROR_EOF)
+               return ret;
+       if (ret >= 0)
+               *got_frame = 1;
+
+       return 0;
+}
+
+static int encode(AVCodecContext *avctx, AVPacket *pkt, int *got_packet, AVFrame *frame)
+{
+       int ret;
+
+       *got_packet = 0;
+
+       ret = avcodec_send_frame(avctx, frame);
+       if (ret < 0)
+               return ret;
+
+       ret = avcodec_receive_packet(avctx, pkt);
+       if (!ret)
+               *got_packet = 1;
+       if (ret == AVERROR(EAGAIN))
+               return 0;
+
+       return ret;
+}
+
+
 static int am7xxx_play(const char *input_format_string,
                       AVDictionary **input_options,
                       const char *input_path,
@@ -369,7 +431,7 @@ static int am7xxx_play(const char *input_format_string,
 
                /* decode */
                got_frame = 0;
-               ret = avcodec_decode_video2(input_ctx.codec_ctx, frame_raw, &got_frame, &in_packet);
+               ret = decode(input_ctx.codec_ctx, frame_raw, &got_frame, &in_packet);
                if (ret < 0) {
                        fprintf(stderr, "cannot decode video\n");
                        run = 0;
@@ -378,7 +440,7 @@ static int am7xxx_play(const char *input_format_string,
 
                /* if we got the complete frame */
                if (got_frame) {
-                       /* 
+                       /*
                         * Rescaling the frame also changes its pixel format
                         * to the raw format supported by the projector if
                         * this was set in video_output_init()
@@ -400,10 +462,10 @@ static int am7xxx_play(const char *input_format_string,
                                out_packet.data = NULL;
                                out_packet.size = 0;
                                got_packet = 0;
-                               ret = avcodec_encode_video2(output_ctx.codec_ctx,
-                                                           &out_packet,
-                                                           frame_scaled,
-                                                           &got_packet);
+                               ret = encode(output_ctx.codec_ctx,
+                                            &out_packet,
+                                            &got_packet,
+                                            frame_scaled);
                                if (ret < 0 || !got_packet) {
                                        fprintf(stderr, "cannot encode video\n");
                                        run = 0;