BMP encoder by Michel Bardiaux, mbardiaux mediaxim be

Originally committed as revision 7824 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 98 insertions, 0 deletions

diff --git a/libavcodec/bmpenc.c b/libavcodec/bmpenc.c
new file mode 100644
index 0000000000..3510385042
--- /dev/null
+++ b/libavcodec/bmpenc.c
@@ -0,0 +1,98 @@
+/*
+ * BMP image format encoder
+ * Copyright (c) 2006, 2007 Michel Bardiaux
+ *
+ * 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 "avcodec.h"
+#include "bytestream.h"
+#include "bmp.h"
+
+static int bmp_encode_init(AVCodecContext *avctx){
+    BMPContext *s = avctx->priv_data;
+
+    avcodec_get_frame_defaults((AVFrame*)&s->picture);
+    avctx->coded_frame = (AVFrame*)&s->picture;
+
+    return 0;
+}
+
+static int bmp_encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
+    BMPContext *s = avctx->priv_data;
+    AVFrame *pict = data;
+    AVFrame * const p= (AVFrame*)&s->picture;
+    int n_bytes_image, n_bytes_per_row, n_bytes, i, n, hsize;
+    uint8_t *ptr;
+    unsigned char* buf0 = buf;
+    *p = *pict;
+    p->pict_type= FF_I_TYPE;
+    p->key_frame= 1;
+    n_bytes_per_row = (avctx->width*3 + 3) & ~3;
+    n_bytes_image = avctx->height*n_bytes_per_row;
+
+    // STRUCTURE.field refer to the MSVC documentation for BITMAPFILEHEADER
+    // and related pages.
+#define SIZE_BITMAPFILEHEADER 14
+#define SIZE_BITMAPINFOHEADER 40
+    hsize = SIZE_BITMAPFILEHEADER + SIZE_BITMAPINFOHEADER;
+    n_bytes = n_bytes_image + hsize;
+    if(n_bytes>buf_size) {
+        av_log(avctx, AV_LOG_ERROR, "buf size too small (need %d, got %d)\n", n_bytes, buf_size);
+        return -1;
+    }
+    bytestream_put_byte(&buf, 'B');                   // BITMAPFILEHEADER.bfType
+    bytestream_put_byte(&buf, 'M');                   // do.
+    bytestream_put_le32(&buf, n_bytes);               // BITMAPFILEHEADER.bfSize
+    bytestream_put_le16(&buf, 0);                     // BITMAPFILEHEADER.bfReserved1
+    bytestream_put_le16(&buf, 0);                     // BITMAPFILEHEADER.bfReserved2
+    bytestream_put_le32(&buf, hsize);                 // BITMAPFILEHEADER.bfOffBits
+    bytestream_put_le32(&buf, SIZE_BITMAPINFOHEADER); // BITMAPINFOHEADER.biSize
+    bytestream_put_le32(&buf, avctx->width);          // BITMAPINFOHEADER.biWidth
+    bytestream_put_le32(&buf, avctx->height);         // BITMAPINFOHEADER.biHeight
+    bytestream_put_le16(&buf, 1);                     // BITMAPINFOHEADER.biPlanes
+    bytestream_put_le16(&buf, 24);                    // BITMAPINFOHEADER.biBitCount
+    bytestream_put_le32(&buf, BMP_RGB);               // BITMAPINFOHEADER.biCompression
+    bytestream_put_le32(&buf, n_bytes_image);         // BITMAPINFOHEADER.biSizeImage
+    bytestream_put_le32(&buf, 0);                     // BITMAPINFOHEADER.biXPelsPerMeter
+    bytestream_put_le32(&buf, 0);                     // BITMAPINFOHEADER.biYPelsPerMeter
+    bytestream_put_le32(&buf, 0);                     // BITMAPINFOHEADER.biClrUsed
+    bytestream_put_le32(&buf, 0);                     // BITMAPINFOHEADER.biClrImportant
+    // BMP files are bottom-to-top so we start from the end...
+    ptr = p->data[0] + (avctx->height - 1) * p->linesize[0];
+    buf = buf0 + hsize;
+    for(i = 0; i < avctx->height; i++) {
+        n = 3*avctx->width;
+        memcpy(buf, ptr, n);
+        buf += n;
+        memset(buf, 0, n_bytes_per_row-n);
+        buf += n_bytes_per_row-n;
+        ptr -= p->linesize[0]; // ... and go back
+    }
+    return n_bytes;
+}
+
+AVCodec bmp_encoder = {
+    "bmp",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_BMP,
+    sizeof(BMPContext),
+    bmp_encode_init,
+    bmp_encode_frame,
+    NULL, //encode_end,
+    .pix_fmts= (enum PixelFormat[]){PIX_FMT_BGR24, -1},
+};