[FFmpeg-devel] [PATCH] DPX image encoder
Peter Ross
pross at xvid.org
Mon Mar 28 14:26:40 CEST 2011
---
1. HEADER_SIZE is the length of the DPX Generic header.
2. Have updated to use accurate header descriptions, per SMPTE-268M-2003.
Thanks Kieran for picking up on this.
Changelog | 1 +
doc/general.texi | 2 +-
libavcodec/Makefile | 1 +
libavcodec/allcodecs.c | 2 +-
libavcodec/dpxenc.c | 136 ++++++++++++++++++++++++++++++++++++++++++++++++
5 files changed, 140 insertions(+), 2 deletions(-)
create mode 100644 libavcodec/dpxenc.c
diff --git a/Changelog b/Changelog
index c91faab..761f790 100644
--- a/Changelog
+++ b/Changelog
@@ -81,6 +81,7 @@ version <next>:
- Linux framebuffer input device added
- Apple HTTP Live Streaming protocol handler
- sndio support for playback and record
+- DPX image encoder
version 0.6:
diff --git a/doc/general.texi b/doc/general.texi
index 23ffb0d..29fb997 100644
--- a/doc/general.texi
+++ b/doc/general.texi
@@ -275,7 +275,7 @@ following image formats are supported:
@tab Only uncompressed GIFs are generated.
@item BMP @tab X @tab X
@tab Microsoft BMP image
- at item DPX @tab @tab X
+ at item DPX @tab X @tab X
@tab Digital Picture Exchange
@item JPEG @tab X @tab X
@tab Progressive JPEG is not supported.
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 2dc9f93..7ee7035 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -110,6 +110,7 @@ OBJS-$(CONFIG_DNXHD_ENCODER) += dnxhdenc.o dnxhddata.o \
ratecontrol.o mpeg12data.o \
mpegvideo.o
OBJS-$(CONFIG_DPX_DECODER) += dpx.o
+OBJS-$(CONFIG_DPX_ENCODER) += dpxenc.o
OBJS-$(CONFIG_DSICINAUDIO_DECODER) += dsicinav.o
OBJS-$(CONFIG_DSICINVIDEO_DECODER) += dsicinav.o
OBJS-$(CONFIG_DVBSUB_DECODER) += dvbsubdec.o
diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
index 695b25b..833ad3c 100644
--- a/libavcodec/allcodecs.c
+++ b/libavcodec/allcodecs.c
@@ -89,7 +89,7 @@ void avcodec_register_all(void)
REGISTER_DECODER (CSCD, cscd);
REGISTER_DECODER (CYUV, cyuv);
REGISTER_ENCDEC (DNXHD, dnxhd);
- REGISTER_DECODER (DPX, dpx);
+ REGISTER_ENCDEC (DPX, dpx);
REGISTER_DECODER (DSICINVIDEO, dsicinvideo);
REGISTER_ENCDEC (DVVIDEO, dvvideo);
REGISTER_DECODER (DXA, dxa);
diff --git a/libavcodec/dpxenc.c b/libavcodec/dpxenc.c
new file mode 100644
index 0000000..416a346
--- /dev/null
+++ b/libavcodec/dpxenc.c
@@ -0,0 +1,136 @@
+/*
+ * DPX (.dpx) image encoder
+ * Copyright (c) 2011 Peter Ross <pross at xvid.org>
+ *
+ * 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/imgutils.h"
+#include "avcodec.h"
+
+typedef struct DPXContext {
+ AVFrame picture;
+ int big_endian;
+ int bits_per_component;
+ int descriptor;
+} DPXContext;
+
+static av_cold int encode_init(AVCodecContext *avctx)
+{
+ DPXContext *s = avctx->priv_data;
+
+ avctx->coded_frame = &s->picture;
+ avctx->coded_frame->pict_type = FF_I_TYPE;
+ avctx->coded_frame->key_frame = 1;
+
+ s->big_endian = 1;
+ s->bits_per_component = 8;
+ s->descriptor = 50; /* RGB */
+
+ switch (avctx->pix_fmt) {
+ case PIX_FMT_RGB24:
+ break;
+ case PIX_FMT_RGBA:
+ s->descriptor = 51; /* RGBA */
+ break;
+ case PIX_FMT_RGB48LE:
+ s->big_endian = 0;
+ case PIX_FMT_RGB48BE:
+ s->bits_per_component = avctx->bits_per_raw_sample ? avctx->bits_per_raw_sample : 16;
+ break;
+ default:
+ av_log(avctx, AV_LOG_INFO, "unsupported pixel format\n");
+ return -1;
+ }
+
+ return 0;
+}
+
+#define write16(p, value) \
+do { \
+ if (s->big_endian) AV_WB16(p, value); \
+ else AV_WL16(p, value); \
+} while(0)
+
+#define write32(p, value) \
+do { \
+ if (s->big_endian) AV_WB32(p, value); \
+ else AV_WL32(p, value); \
+} while(0)
+
+static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data)
+{
+ DPXContext *s = avctx->priv_data;
+ int size;
+
+#define HEADER_SIZE 0x680 /* DPX Generic header size */
+ if (buf_size < HEADER_SIZE)
+ return -1;
+
+ memset(buf, 0, HEADER_SIZE);
+
+ /* File information header */
+ write32(buf, MKBETAG('S','D','P','X'));
+ write32(buf + 4, HEADER_SIZE);
+ memcpy (buf + 8, "V1.0", 4);
+ write32(buf + 0x14, 1); /* new image */
+ write32(buf + 0x18, HEADER_SIZE);
+ memcpy (buf + 0xA0, LIBAVCODEC_IDENT, FFMIN(sizeof(LIBAVCODEC_IDENT), 100));
+ write32(buf + 0x294, 0xFFFFFFFF); /* unencrypted */
+
+ /* Image information header */
+ write16(buf + 0x300, 0); /* orientation; left to right, top to bottom */
+ write16(buf + 0x302, 1); /* number of elements */
+ write32(buf + 0x304, avctx->width);
+ write32(buf + 0x308, avctx->height);
+ buf[0x320] = s->descriptor;
+ buf[0x321] = 2; /* linear transfer */
+ buf[0x322] = 2; /* linear colorimetric */
+ buf[0x323] = s->bits_per_component;
+
+ /* Image source information header */
+ write32(buf + 0x540, avctx->sample_aspect_ratio.num);
+ write32(buf + 0x544, avctx->sample_aspect_ratio.den);
+
+ size = avpicture_layout((AVPicture*)data, avctx->pix_fmt,
+ avctx->width, avctx->height,
+ buf + HEADER_SIZE, buf_size - HEADER_SIZE);
+ if (size < 0)
+ return size;
+
+ size += HEADER_SIZE;
+
+ write32(buf + 0x10, size); /* file size */
+ return size;
+}
+
+AVCodec ff_dpx_encoder = {
+ "dpx",
+ AVMEDIA_TYPE_VIDEO,
+ CODEC_ID_DPX,
+ sizeof(DPXContext),
+ encode_init,
+ encode_frame,
+ .pix_fmts= (const enum PixelFormat[]){
+ PIX_FMT_RGB24,
+ PIX_FMT_RGBA,
+ PIX_FMT_RGB48LE,
+ PIX_FMT_RGB48BE,
+ PIX_FMT_NONE},
+ .long_name = NULL_IF_CONFIG_SMALL("DPX image"),
+};
--
1.7.4.1
-- Peter
(A907 E02F A6E5 0CD2 34CD 20D2 6760 79C5 AC40 DD6B)
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