contrib: add AppStream metadata

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

diff --git a/examples/am7xxx-play.c b/examples/am7xxx-play.c
index 9deffd2..81aff84 100644 (file)
--- a/examples/am7xxx-play.c
+++ b/examples/am7xxx-play.c
@@ -177,7 +177,7 @@ static int video_output_init(struct video_output_ctx *output_ctx,
                goto out;
        }
 
                goto out;
        }
 

-       /* Calculate the new output dimension so the original picture is shown
+       /* Calculate the new output dimension so the original frame is shown

         * in its entirety */
        ret = am7xxx_calc_scaled_image_dimensions(dev,
                                                  upscale,
         * in its entirety */
        ret = am7xxx_calc_scaled_image_dimensions(dev,
                                                  upscale,


@@ -211,6 +211,7 @@ static int video_output_init(struct video_output_ctx *output_ctx,
                goto out;
        }
 
                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;
        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,
 static int am7xxx_play(const char *input_format_string,
                       AVDictionary **input_options,
                       const char *input_path,


@@ -268,16 +330,16 @@ static int am7xxx_play(const char *input_format_string,
 {
        struct video_input_ctx input_ctx;
        struct video_output_ctx output_ctx;
 {
        struct video_input_ctx input_ctx;
        struct video_output_ctx output_ctx;

-       AVFrame *picture_raw;
-       AVFrame *picture_scaled;
+       AVFrame *frame_raw;
+       AVFrame *frame_scaled;

        int out_buf_size;
        uint8_t *out_buf;
        int out_buf_size;
        uint8_t *out_buf;

-       int out_picture_size;
-       uint8_t *out_picture;
+       int out_frame_size;
+       uint8_t *out_frame;

        struct SwsContext *sw_scale_ctx;
        AVPacket in_packet;
        AVPacket out_packet;
        struct SwsContext *sw_scale_ctx;
        AVPacket in_packet;
        AVPacket out_packet;

-       int got_picture;
+       int got_frame;

        int got_packet;
        int ret;
 
        int got_packet;
        int ret;
 


@@ -294,23 +356,23 @@ static int am7xxx_play(const char *input_format_string,
        }
 
        /* allocate an input frame */
        }
 
        /* allocate an input frame */

-       picture_raw = av_frame_alloc();
-       if (picture_raw == NULL) {
-               fprintf(stderr, "cannot allocate the raw picture frame!\n");
+       frame_raw = av_frame_alloc();
+       if (frame_raw == NULL) {
+               fprintf(stderr, "cannot allocate the raw frame!\n");

                ret = -ENOMEM;
                goto cleanup_output;
        }
 
        /* allocate output frame */
                ret = -ENOMEM;
                goto cleanup_output;
        }
 
        /* allocate output frame */

-       picture_scaled = av_frame_alloc();
-       if (picture_scaled == NULL) {
-               fprintf(stderr, "cannot allocate the scaled picture!\n");
+       frame_scaled = av_frame_alloc();
+       if (frame_scaled == NULL) {
+               fprintf(stderr, "cannot allocate the scaled frame!\n");

                ret = -ENOMEM;
                ret = -ENOMEM;

-               goto cleanup_picture_raw;
+               goto cleanup_frame_raw;

        }
        }

-       picture_scaled->format = (output_ctx.codec_ctx)->pix_fmt;
-       picture_scaled->width = (output_ctx.codec_ctx)->width;
-       picture_scaled->height = (output_ctx.codec_ctx)->height;
+       frame_scaled->format = (output_ctx.codec_ctx)->pix_fmt;
+       frame_scaled->width = (output_ctx.codec_ctx)->width;
+       frame_scaled->height = (output_ctx.codec_ctx)->height;

 
        /* calculate the bytes needed for the output image and create buffer for the output image */
        out_buf_size = av_image_get_buffer_size((output_ctx.codec_ctx)->pix_fmt,
 
        /* calculate the bytes needed for the output image and create buffer for the output image */
        out_buf_size = av_image_get_buffer_size((output_ctx.codec_ctx)->pix_fmt,


@@ -321,12 +383,12 @@ static int am7xxx_play(const char *input_format_string,
        if (out_buf == NULL) {
                fprintf(stderr, "cannot allocate output data buffer!\n");
                ret = -ENOMEM;
        if (out_buf == NULL) {
                fprintf(stderr, "cannot allocate output data buffer!\n");
                ret = -ENOMEM;

-               goto cleanup_picture_scaled;
+               goto cleanup_frame_scaled;

        }
 
        }
 

-       /* assign appropriate parts of buffer to image planes in picture_scaled */
-       av_image_fill_arrays(picture_scaled->data,
-                            picture_scaled->linesize,
+       /* assign appropriate parts of buffer to image planes in frame_scaled */
+       av_image_fill_arrays(frame_scaled->data,
+                            frame_scaled->linesize,

                             out_buf,
                             (output_ctx.codec_ctx)->pix_fmt,
                             (output_ctx.codec_ctx)->width,
                             out_buf,
                             (output_ctx.codec_ctx)->pix_fmt,
                             (output_ctx.codec_ctx)->width,


@@ -368,8 +430,8 @@ static int am7xxx_play(const char *input_format_string,
                }
 
                /* decode */
                }
 
                /* decode */

-               got_picture = 0;
-               ret = avcodec_decode_video2(input_ctx.codec_ctx, picture_raw, &got_picture, &in_packet);
+               got_frame = 0;
+               ret = decode(input_ctx.codec_ctx, frame_raw, &got_frame, &in_packet);

                if (ret < 0) {
                        fprintf(stderr, "cannot decode video\n");
                        run = 0;
                if (ret < 0) {
                        fprintf(stderr, "cannot decode video\n");
                        run = 0;


@@ -377,41 +439,41 @@ static int am7xxx_play(const char *input_format_string,
                }
 
                /* if we got the complete frame */
                }
 
                /* if we got the complete frame */

-               if (got_picture) {
-                       /* 
-                        * Rescaling the picture also changes its pixel format
+               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()
                         */
                        sws_scale(sw_scale_ctx,
                         * to the raw format supported by the projector if
                         * this was set in video_output_init()
                         */
                        sws_scale(sw_scale_ctx,

-                                 (const uint8_t * const *)picture_raw->data,
-                                 picture_raw->linesize,
+                                 (const uint8_t * const *)frame_raw->data,
+                                 frame_raw->linesize,

                                  0,
                                  (input_ctx.codec_ctx)->height,
                                  0,
                                  (input_ctx.codec_ctx)->height,

-                                 picture_scaled->data,
-                                 picture_scaled->linesize);
+                                 frame_scaled->data,
+                                 frame_scaled->linesize);

 
                        if (output_ctx.raw_output) {
 
                        if (output_ctx.raw_output) {

-                               out_picture = out_buf;
-                               out_picture_size = out_buf_size;
+                               out_frame = out_buf;
+                               out_frame_size = out_buf_size;

                        } else {
                        } else {

-                               picture_scaled->quality = (output_ctx.codec_ctx)->global_quality;
+                               frame_scaled->quality = (output_ctx.codec_ctx)->global_quality;

                                av_init_packet(&out_packet);
                                out_packet.data = NULL;
                                out_packet.size = 0;
                                got_packet = 0;
                                av_init_packet(&out_packet);
                                out_packet.data = NULL;
                                out_packet.size = 0;
                                got_packet = 0;

-                               ret = avcodec_encode_video2(output_ctx.codec_ctx,
-                                                           &out_packet,
-                                                           picture_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;
                                        goto end_while;
                                }
 
                                if (ret < 0 || !got_packet) {
                                        fprintf(stderr, "cannot encode video\n");
                                        run = 0;
                                        goto end_while;
                                }
 

-                               out_picture = out_packet.data;
-                               out_picture_size = out_packet.size;
+                               out_frame = out_packet.data;
+                               out_frame_size = out_packet.size;

                        }
 
 #ifdef DEBUG
                        }
 
 #ifdef DEBUG


@@ -423,7 +485,7 @@ static int am7xxx_play(const char *input_format_string,
                                else
                                        snprintf(filename, NAME_MAX, "out.raw");
                                file = fopen(filename, "wb");
                                else
                                        snprintf(filename, NAME_MAX, "out.raw");
                                file = fopen(filename, "wb");

-                               fwrite(out_picture, 1, out_picture_size, file);
+                               fwrite(out_frame, 1, out_frame_size, file);

                                fclose(file);
                        }
 #else
                                fclose(file);
                        }
 #else


@@ -434,8 +496,8 @@ static int am7xxx_play(const char *input_format_string,
                                                      image_format,
                                                      (output_ctx.codec_ctx)->width,
                                                      (output_ctx.codec_ctx)->height,
                                                      image_format,
                                                      (output_ctx.codec_ctx)->width,
                                                      (output_ctx.codec_ctx)->height,

-                                                     out_picture,
-                                                     out_picture_size);
+                                                     out_frame,
+                                                     out_frame_size);

                        if (ret < 0) {
                                perror("am7xxx_send_image_async");
                                run = 0;
                        if (ret < 0) {
                                perror("am7xxx_send_image_async");
                                run = 0;


@@ -451,10 +513,10 @@ end_while:
        sws_freeContext(sw_scale_ctx);
 cleanup_out_buf:
        av_free(out_buf);
        sws_freeContext(sw_scale_ctx);
 cleanup_out_buf:
        av_free(out_buf);

-cleanup_picture_scaled:
-       av_frame_free(&picture_scaled);
-cleanup_picture_raw:
-       av_frame_free(&picture_raw);
+cleanup_frame_scaled:
+       av_frame_free(&frame_scaled);
+cleanup_frame_raw:
+       av_frame_free(&frame_raw);

 
 cleanup_output:
        /* Freeing the codec context is needed as well,
 
 cleanup_output:
        /* Freeing the codec context is needed as well,