Add stream_cb example

Signed-off-by: wm4 <wm4@nowhere>

2 files changed, 104 insertions, 0 deletions

diff --git a/libmpv/README.md b/libmpv/README.md
index f1b7828..cc9e5dd 100644
--- a/libmpv/README.md
+++ b/libmpv/README.md
@@ -118,3 +118,8 @@ video is not a normal QML element. Uses the opengl-cb API for video.
 
 Show how to embed the mpv OpenGL renderer in SDL. Uses the opengl-cb API for
 video.
+
+### streamcb
+
+Demonstrates use of the custom stream API.
+
diff --git a/libmpv/streamcb/simple-streamcb.c b/libmpv/streamcb/simple-streamcb.c
new file mode 100644
index 0000000..cec7725
--- /dev/null
+++ b/libmpv/streamcb/simple-streamcb.c
@@ -0,0 +1,99 @@
+// Build with: gcc -o simple-streamcb simple-streamcb.c `pkg-config --libs --cflags mpv`
+
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <mpv/client.h>
+#include <mpv/stream_cb.h>
+
+static int64_t read_fn(void *cookie, char *buf, uint64_t nbytes)
+{
+    FILE *fp = cookie;
+    size_t ret = fread(buf, 1, nbytes, fp);
+    if (ret == 0) {
+        return feof(fp) ? 0 : -1;
+    }
+    return ret;
+}
+
+static int64_t seek_fn(void *cookie, int64_t offset)
+{
+    FILE *fp = cookie;
+    // not 64-bit safe
+    int r = fseek(fp, offset, SEEK_SET);
+    return r < 0 ? MPV_ERROR_GENERIC : r;
+}
+
+static void close_fn(void *cookie)
+{
+    FILE *fp = cookie;
+    fclose(fp);
+}
+
+static int open_fn(void *user_data, char *uri, mpv_stream_cb_info *info)
+{
+    FILE *fp = fopen((char *)user_data, "r");
+    info->cookie = fp;
+    info->read_fn = read_fn;
+    info->seek_fn = seek_fn;
+    info->close_fn = close_fn;
+    return fp ? 0 : MPV_ERROR_LOADING_FAILED;
+}
+
+static inline void check_error(int status)
+{
+    if (status < 0) {
+        printf("mpv API error: %s\n", mpv_error_string(status));
+        exit(1);
+    }
+}
+
+int main(int argc, char *argv[])
+{
+    if (argc != 2) {
+        printf("pass a single media file as argument\n");
+        return 1;
+    }
+
+    mpv_handle *ctx = mpv_create();
+    if (!ctx) {
+        printf("failed creating context\n");
+        return 1;
+    }
+
+    // Enable default key bindings, so the user can actually interact with
+    // the player (and e.g. close the window).
+    check_error(mpv_set_option_string(ctx, "input-default-bindings", "yes"));
+
+    mpv_set_option_string(ctx, "input-vo-keyboard", "yes");
+    int val = 1;
+    check_error(mpv_set_option(ctx, "osc", MPV_FORMAT_FLAG, &val));
+
+    // Done setting up options.
+    check_error(mpv_initialize(ctx));
+
+    check_error(mpv_request_log_messages(ctx, "v"));
+
+    check_error(mpv_stream_cb_add_ro(ctx, "myprotocol", argv[1], open_fn));
+
+    // Play this file.
+    const char *cmd[] = {"loadfile", "myprotocol://fake", NULL};
+    check_error(mpv_command(ctx, cmd));
+
+    // Let it play, and wait until the user quits.
+    while (1) {
+        mpv_event *event = mpv_wait_event(ctx, 10000);
+        if (event->event_id == MPV_EVENT_LOG_MESSAGE) {
+            struct mpv_event_log_message *msg = (struct mpv_event_log_message *)event->data;
+            printf("[%s] %s: %s", msg->prefix, msg->level, msg->text);
+            continue;
+        }
+        printf("event: %s\n", mpv_event_name(event->event_id));
+        if (event->event_id == MPV_EVENT_SHUTDOWN)
+            break;
+    }
+
+    mpv_terminate_destroy(ctx);
+    return 0;
+}