tools: add seek_print.

Useful for testing seek implementations.

.gitignore

@@ -67,3 +67,4 @@
 /tools/probetest
 /tools/qt-faststart
 /tools/trasher
+/tools/seek_print

libavformat/Makefile

@@ -449,3 +449,4 @@ TOOLS     = aviocat                                                     \
             ismindex                                                    \
             pktdumper                                                   \
             probetest                                                   \
+            seek_print                                                  \

tools/seek_print.c

@@ -0,0 +1,107 @@
+/*
+ * Copyright (c) 2013 Nicolas George
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with FFmpeg; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <unistd.h>
+
+#include "config.h"
+#if HAVE_UNISTD_H
+#include <unistd.h>             /* getopt */
+#endif
+
+#include "libavformat/avformat.h"
+#include "libavutil/timestamp.h"
+
+#if !HAVE_GETOPT
+#include "compat/getopt.c"
+#endif
+
+static void usage(int ret)
+{
+    fprintf(ret ? stderr : stdout,
+            "Usage: seek_print file [command ...]\n"
+            "Commands:\n"
+            "    read\n"
+            "    seek:stream:min_ts:ts:max_ts:flags\n"
+            );
+    exit(ret);
+}
+
+int main(int argc, char **argv)
+{
+    int opt, ret, stream, flags;
+    const char *filename;
+    AVFormatContext *avf = NULL;
+    int64_t min_ts, max_ts, ts;
+    AVPacket packet;
+
+    while ((opt = getopt(argc, argv, "h")) != -1) {
+        switch (opt) {
+        case 'h':
+            usage(0);
+        default:
+            usage(1);
+        }
+    }
+    argc -= optind;
+    argv += optind;
+    if (!argc)
+        usage(1);
+    filename = *argv;
+    argv++;
+    argc--;
+
+    av_register_all();
+    if ((ret = avformat_open_input(&avf, filename, NULL, NULL)) < 0) {
+        fprintf(stderr, "%s: %s\n", filename, av_err2str(ret));
+        return 1;
+    }
+    if ((ret = avformat_find_stream_info(avf, NULL)) < 0) {
+        fprintf(stderr, "%s: could not find codec parameters: %s\n", filename,
+                av_err2str(ret));
+        return 1;
+    }
+
+    for (; argc; argc--, argv++) {
+        if (!strcmp(*argv, "read")) {
+            ret = av_read_frame(avf, &packet);
+            if (ret < 0) {
+                printf("read: %d (%s)\n", ret, av_err2str(ret));
+            } else {
+                AVRational *tb = &avf->streams[packet.stream_index]->time_base;
+                printf("read: %d size=%d stream=%d dts=%s (%s) pts=%s (%s)\n",
+                       ret, packet.size, packet.stream_index,
+                       av_ts2str(packet.dts), av_ts2timestr(packet.dts, tb),
+                       av_ts2str(packet.pts), av_ts2timestr(packet.pts, tb));
+                av_free_packet(&packet);
+            }
+        } else if (sscanf(*argv, "seek:%i:%"PRIi64":%"PRIi64":%"PRIi64":%i",
+                   &stream, &min_ts, &ts, &max_ts, &flags) == 5) {
+            ret = avformat_seek_file(avf, stream, min_ts, ts, max_ts, flags);
+            printf("seek: %d (%s)\n", ret, av_err2str(ret));
+        } else {
+            fprintf(stderr, "'%s': unknown command\n", *argv);
+            return 1;
+        }
+    }
+
+    avformat_close_input(&avf);
+
+    return 0;
+}