lavfi: port libmpcodecs remove-logo filter

The code is based on the remove-logo filter in MPlayer/libmpcodecs, by Robert Edele, relicensed to LGPL with consent of the author. Address trac issue #249.
2012-03-10 14:01:28 +01:00
parent 087b9c326f
commit 2f83681c79
11 changed files with 832 additions and 2 deletions
--- a/libavfilter/lavfutils.c
+++ b/libavfilter/lavfutils.c
@@ -0,0 +1,95 @@
+/*
+ * 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/imgutils.h"
+#include "lavfutils.h"
+
+int ff_load_image(uint8_t *data[4], int linesize[4],
+                  int *w, int *h, enum PixelFormat *pix_fmt,
+                  const char *filename, void *log_ctx)
+{
+    AVInputFormat *iformat = NULL;
+    AVFormatContext *format_ctx;
+    AVCodec *codec;
+    AVCodecContext *codec_ctx;
+    AVFrame *frame;
+    int frame_decoded, ret = 0;
+    AVPacket pkt;
+
+    av_register_all();
+
+    iformat = av_find_input_format("image2");
+    if ((ret = avformat_open_input(&format_ctx, filename, iformat, NULL)) < 0) {
+        av_log(log_ctx, AV_LOG_ERROR,
+               "Failed to open input file '%s'\n", filename);
+        return ret;
+    }
+
+    codec_ctx = format_ctx->streams[0]->codec;
+    codec = avcodec_find_decoder(codec_ctx->codec_id);
+    if (!codec) {
+        av_log(log_ctx, AV_LOG_ERROR, "Failed to find codec\n");
+        ret = AVERROR(EINVAL);
+        goto end;
+    }
+
+    if ((ret = avcodec_open2(codec_ctx, codec, NULL)) < 0) {
+        av_log(log_ctx, AV_LOG_ERROR, "Failed to open codec\n");
+        goto end;
+    }
+
+    if (!(frame = avcodec_alloc_frame()) ) {
+        av_log(log_ctx, AV_LOG_ERROR, "Failed to alloc frame\n");
+        ret = AVERROR(ENOMEM);
+        goto end;
+    }
+
+    ret = av_read_frame(format_ctx, &pkt);
+    if (ret < 0) {
+        av_log(log_ctx, AV_LOG_ERROR, "Failed to read frame from file\n");
+        goto end;
+    }
+
+    ret = avcodec_decode_video2(codec_ctx, frame, &frame_decoded, &pkt);
+    if (ret < 0 || !frame_decoded) {
+        av_log(log_ctx, AV_LOG_ERROR, "Failed to decode image from file\n");
+        goto end;
+    }
+    ret = 0;
+
+    *w       = frame->width;
+    *h       = frame->height;
+    *pix_fmt = frame->format;
+
+    if ((ret = av_image_alloc(data, linesize, *w, *h, *pix_fmt, 16)) < 0)
+        goto end;
+    ret = 0;
+
+    av_image_copy(data, linesize, frame->data, frame->linesize, *pix_fmt, *w, *h);
+
+end:
+    if (codec_ctx)
+        avcodec_close(codec_ctx);
+    if (format_ctx)
+        avformat_close_input(&format_ctx);
+    av_freep(&frame);
+
+    if (ret < 0)
+        av_log(log_ctx, AV_LOG_ERROR, "Error loading image file '%s'\n", filename);
+    return ret;
+}