[FFmpeg-devel] [PATCH] lavf: add data: URI scheme.

[Nicolas George]

Signed-off-by: Nicolas George <nicolas.george at normalesup.org>
---
 Changelog                |    1 +
 libavformat/Makefile     |    1 +
 libavformat/allformats.c |    1 +
 libavformat/data_uri.c   |  110 ++++++++++++++++++++++++++++++++++++++++++++++
 libavformat/version.h    |    4 +-
 5 files changed, 115 insertions(+), 2 deletions(-)
 create mode 100644 libavformat/data_uri.c

diff --git a/Changelog b/Changelog
index 9eec45c..7b408ef 100644
--- a/Changelog
+++ b/Changelog
@@ -50,6 +50,7 @@ version <next>:
 - documentation split into per-component manuals
 - pp (postproc) filter ported from MPlayer
 - NIST Sphere demuxer
+- data: URI scheme
 
 
 version 1.0:
diff --git a/libavformat/Makefile b/libavformat/Makefile
index 587fa42..2787a8a 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -401,6 +401,7 @@ OBJS-$(CONFIG_BLURAY_PROTOCOL)           += bluray.o
 OBJS-$(CONFIG_CACHE_PROTOCOL)            += cache.o
 OBJS-$(CONFIG_CONCAT_PROTOCOL)           += concat.o
 OBJS-$(CONFIG_CRYPTO_PROTOCOL)           += crypto.o
+OBJS-$(CONFIG_DATA_PROTOCOL)             += data_uri.o
 OBJS-$(CONFIG_FFRTMPCRYPT_PROTOCOL)      += rtmpcrypt.o rtmpdh.o
 OBJS-$(CONFIG_FFRTMPHTTP_PROTOCOL)       += rtmphttp.o
 OBJS-$(CONFIG_FILE_PROTOCOL)             += file.o
diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index 6b4c27b..432e5b6 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -288,6 +288,7 @@ void av_register_all(void)
     REGISTER_PROTOCOL (CACHE, cache);
     REGISTER_PROTOCOL (CONCAT, concat);
     REGISTER_PROTOCOL (CRYPTO, crypto);
+    REGISTER_PROTOCOL (DATA, data);
     REGISTER_PROTOCOL (FFRTMPCRYPT, ffrtmpcrypt);
     REGISTER_PROTOCOL (FFRTMPHTTP, ffrtmphttp);
     REGISTER_PROTOCOL (FILE, file);
diff --git a/libavformat/data_uri.c b/libavformat/data_uri.c
new file mode 100644
index 0000000..124f0f0
--- /dev/null
+++ b/libavformat/data_uri.c
@@ -0,0 +1,110 @@
+/*
+ * Copyright (c) 2012 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 <string.h>
+#include "libavutil/avstring.h"
+#include "libavutil/base64.h"
+#include "url.h"
+
+typedef struct {
+    const uint8_t *data;
+    void *tofree;
+    size_t size;
+    size_t pos;
+} DataContext;
+
+static av_cold int data_open(URLContext *h, const char *uri, int flags)
+{
+    DataContext *dc = h->priv_data;
+    const char *data, *opt, *next;
+    char *ddata;
+    int ret, base64 = 0;
+    size_t in_size;
+
+    av_strstart(uri, "data:", &uri);
+    data = strchr(uri, ',');
+    if (!data)
+        return AVERROR(EINVAL);
+    opt = uri;
+    while (opt < data) {
+        next = av_x_if_null(memchr(opt, ';', data - opt), data);
+        if (opt == uri) {
+            if (!memchr(opt, '/', next - opt)) /* basic validity check */
+                return AVERROR(EINVAL);
+            av_log(h, AV_LOG_VERBOSE, "Content-type: %.*s\n",
+                   (int)(next - opt), opt);
+        } else {
+            if (!av_strncasecmp(opt, "base64", next - opt)) {
+                base64 = 1;
+            } else {
+                av_log(h, AV_LOG_VERBOSE, "Ignoring option '%.*s'\n",
+                       (int)(next - opt), opt);
+            }
+        }
+        opt = next + 1;
+    }
+
+    data++;
+    in_size = strlen(data);
+    if (base64) {
+        size_t out_size = 3 * in_size / 4 + 1;
+
+        if (out_size > INT_MAX || !(ddata = av_malloc(out_size)))
+            return AVERROR(ENOMEM);
+        if ((ret = av_base64_decode(ddata, data, out_size)) < 0) {
+            av_free(ddata);
+            return ret;
+        }
+        dc->data = dc->tofree = ddata;
+        dc->size = ret;
+    } else {
+        dc->data = data;
+        dc->size = in_size;
+    }
+    return 0;
+}
+
+static av_cold int data_close(URLContext *h)
+{
+    DataContext *dc = h->priv_data;
+
+    av_freep(&dc->tofree);
+    return 0;
+}
+
+static int data_read(URLContext *h, unsigned char *buf, int size)
+{
+    DataContext *dc = h->priv_data;
+
+    if (dc->pos >= dc->size)
+        return AVERROR_EOF;
+    size = FFMIN(size, dc->size - dc->pos);
+    memcpy(buf, dc->data + dc->pos, size);
+    dc->pos += size;
+    return size;
+}
+
+URLProtocol ff_data_protocol = {
+    .name           = "data",
+    .url_open       = data_open,
+    .url_close      = data_close,
+    .url_read       = data_read,
+    .priv_data_size = sizeof(DataContext),
+};
diff --git a/libavformat/version.h b/libavformat/version.h
index bd14e56..8a22dd4 100644
--- a/libavformat/version.h
+++ b/libavformat/version.h
@@ -30,8 +30,8 @@
 #include "libavutil/avutil.h"
 
 #define LIBAVFORMAT_VERSION_MAJOR 54
-#define LIBAVFORMAT_VERSION_MINOR 50
-#define LIBAVFORMAT_VERSION_MICRO 102
+#define LIBAVFORMAT_VERSION_MINOR 51
+#define LIBAVFORMAT_VERSION_MICRO 100
 
 #define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
                                                LIBAVFORMAT_VERSION_MINOR, \
-- 
1.7.10.4