Imported Debian version 2.5.0~trusty1.1

[deb_ffmpeg.git] / ffmpeg / libavformat / webpenc.c

diff --git a/ffmpeg/libavformat/webpenc.c b/ffmpeg/libavformat/webpenc.c
new file mode 100644 (file)
index 0000000..ee110de
--- /dev/null
+++ b/ffmpeg/libavformat/webpenc.c
@@ -0,0 +1,169 @@
+/*
+ * webp muxer
+ * Copyright (c) 2014 Michael Niedermayer
+ *
+ * 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 "libavutil/intreadwrite.h"
+#include "libavutil/opt.h"
+#include "avformat.h"
+#include "internal.h"
+
+typedef struct WebpContext{
+    AVClass *class;
+    int frame_count;
+    AVPacket last_pkt;
+    int loop;
+} WebpContext;
+
+static int webp_write_header(AVFormatContext *s)
+{
+    AVStream *st;
+
+    if (s->nb_streams != 1) {
+        av_log(s, AV_LOG_ERROR, "Only exactly 1 stream is supported\n");
+        return AVERROR(EINVAL);
+    }
+    st = s->streams[0];
+    if (st->codec->codec_id != AV_CODEC_ID_WEBP) {
+        av_log(s, AV_LOG_ERROR, "Only WebP is supported\n");
+        return AVERROR(EINVAL);
+    }
+    avpriv_set_pts_info(st, 24, 1, 1000);
+
+    avio_write(s->pb, "RIFF\0\0\0\0WEBP", 12);
+
+    return 0;
+}
+
+static int flush(AVFormatContext *s, int trailer, int64_t pts)
+{
+    WebpContext *w = s->priv_data;
+    AVStream *st = s->streams[0];
+
+    if (w->last_pkt.size) {
+        int skip = 0;
+        unsigned flags = 0;
+        int vp8x = 0;
+
+        if (AV_RL32(w->last_pkt.data) == AV_RL32("RIFF"))
+            skip = 12;
+        if (AV_RL32(w->last_pkt.data + skip) == AV_RL32("VP8X")) {
+            flags |= w->last_pkt.data[skip + 4 + 4];
+            vp8x = 1;
+            skip += AV_RL32(w->last_pkt.data + skip + 4) + 8;
+        }
+
+        w->frame_count ++;
+
+        if (w->frame_count == 1) {
+            if (!trailer) {
+                vp8x = 1;
+                flags |= 2 + 16;
+            }
+
+            if (vp8x) {
+                avio_write(s->pb, "VP8X", 4);
+                avio_wl32(s->pb, 10);
+                avio_w8(s->pb, flags);
+                avio_wl24(s->pb, 0);
+                avio_wl24(s->pb, st->codec->width - 1);
+                avio_wl24(s->pb, st->codec->height - 1);
+            }
+            if (!trailer) {
+                avio_write(s->pb, "ANIM", 4);
+                avio_wl32(s->pb, 6);
+                avio_wl32(s->pb, 0xFFFFFFFF);
+                avio_wl16(s->pb, w->loop);
+            }
+        }
+
+        if (w->frame_count > trailer) {
+            avio_write(s->pb, "ANMF", 4);
+            avio_wl32(s->pb, 16 + w->last_pkt.size - skip);
+            avio_wl24(s->pb, 0);
+            avio_wl24(s->pb, 0);
+            avio_wl24(s->pb, st->codec->width - 1);
+            avio_wl24(s->pb, st->codec->height - 1);
+            if (w->last_pkt.pts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE) {
+                avio_wl24(s->pb, pts - w->last_pkt.pts);
+            } else
+                avio_wl24(s->pb, w->last_pkt.duration);
+            avio_w8(s->pb, 0);
+        }
+        avio_write(s->pb, w->last_pkt.data + skip, w->last_pkt.size - skip);
+        av_free_packet(&w->last_pkt);
+    }
+
+    return 0;
+}
+
+static int webp_write_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    WebpContext *w = s->priv_data;
+    int ret;
+
+    if ((ret = flush(s, 0, pkt->pts)) < 0)
+        return ret;
+
+    av_copy_packet(&w->last_pkt, pkt);
+
+    return 0;
+}
+
+static int webp_write_trailer(AVFormatContext *s)
+{
+    unsigned filesize;
+    int ret;
+
+    if ((ret = flush(s, 1, AV_NOPTS_VALUE)) < 0)
+        return ret;
+
+    filesize = avio_tell(s->pb);
+    avio_seek(s->pb, 4, SEEK_SET);
+    avio_wl32(s->pb, filesize - 8);
+
+    return 0;
+}
+
+#define OFFSET(x) offsetof(WebpContext, x)
+#define ENC AV_OPT_FLAG_ENCODING_PARAM
+static const AVOption options[] = {
+    { "loop", "Number of times to loop the output: 0 - infinite loop", OFFSET(loop),
+      AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 65535, ENC },
+    { NULL },
+};
+
+static const AVClass webp_muxer_class = {
+    .class_name = "WebP muxer",
+    .item_name  = av_default_item_name,
+    .version    = LIBAVUTIL_VERSION_INT,
+    .option     = options,
+};
+AVOutputFormat ff_webp_muxer = {
+    .name           = "webp",
+    .long_name      = NULL_IF_CONFIG_SMALL("WebP"),
+    .extensions     = "webp",
+    .priv_data_size = sizeof(WebpContext),
+    .video_codec    = AV_CODEC_ID_WEBP,
+    .write_header   = webp_write_header,
+    .write_packet   = webp_write_packet,
+    .write_trailer  = webp_write_trailer,
+    .priv_class     = &webp_muxer_class,
+    .flags          = AVFMT_VARIABLE_FPS,
+};