[FFmpeg-devel] [PATCH 1/3] Bitmap Brothers JV video decoder
Peter Ross
pross
Tue Mar 8 16:10:30 CET 2011
---
libavcodec/Makefile | 1 +
libavcodec/allcodecs.c | 1 +
libavcodec/avcodec.h | 5 +-
libavcodec/jvdec.c | 212 ++++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 217 insertions(+), 2 deletions(-)
create mode 100644 libavcodec/jvdec.c
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 930affb..a66c5db 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -185,6 +185,7 @@ OBJS-$(CONFIG_INTERPLAY_VIDEO_DECODER) += interplayvideo.o
OBJS-$(CONFIG_JPEGLS_DECODER) += jpeglsdec.o jpegls.o \
mjpegdec.o mjpeg.o
OBJS-$(CONFIG_JPEGLS_ENCODER) += jpeglsenc.o jpegls.o
+OBJS-$(CONFIG_JV_DECODER) += jvdec.o
OBJS-$(CONFIG_KGV1_DECODER) += kgv1dec.o
OBJS-$(CONFIG_KMVC_DECODER) += kmvc.o
OBJS-$(CONFIG_LAGARITH_DECODER) += lagarith.o lagarithrac.o
diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
index 108a3ab..2ed49a2 100644
--- a/libavcodec/allcodecs.c
+++ b/libavcodec/allcodecs.c
@@ -126,6 +126,7 @@ void avcodec_register_all(void)
REGISTER_DECODER (INDEO5, indeo5);
REGISTER_DECODER (INTERPLAY_VIDEO, interplay_video);
REGISTER_ENCDEC (JPEGLS, jpegls);
+ REGISTER_DECODER (JV, jv);
REGISTER_DECODER (KGV1, kgv1);
REGISTER_DECODER (KMVC, kmvc);
REGISTER_DECODER (LAGARITH, lagarith);
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 3eedcf9..9d0b6a0 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -32,8 +32,8 @@
#include "libavutil/cpu.h"
#define LIBAVCODEC_VERSION_MAJOR 52
-#define LIBAVCODEC_VERSION_MINOR 113
-#define LIBAVCODEC_VERSION_MICRO 2
+#define LIBAVCODEC_VERSION_MINOR 114
+#define LIBAVCODEC_VERSION_MICRO 0
#define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
LIBAVCODEC_VERSION_MINOR, \
@@ -261,6 +261,7 @@ enum CodecID {
CODEC_ID_MXPEG,
CODEC_ID_LAGARITH,
CODEC_ID_PRORES,
+ CODEC_ID_JV,
/* various PCM "codecs" */
CODEC_ID_PCM_S16LE= 0x10000,
diff --git a/libavcodec/jvdec.c b/libavcodec/jvdec.c
new file mode 100644
index 0000000..7ad797c
--- /dev/null
+++ b/libavcodec/jvdec.c
@@ -0,0 +1,212 @@
+/*
+ * Bitmap Brothers JV video decoder
+ * 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
+ */
+
+/**
+ * @file
+ * Bitmap Brothers JV video decoder
+ * @author Peter Ross <pross at xvid.org>
+ */
+
+#include "avcodec.h"
+#include "dsputil.h"
+#include "get_bits.h"
+#include "libavutil/intreadwrite.h"
+
+typedef struct JvContext {
+ DSPContext dsp;
+ AVFrame frame;
+ uint32_t palette[AVPALETTE_COUNT];
+ int palette_has_changed;
+} JvContext;
+
+static av_cold int decode_init(AVCodecContext *avctx)
+{
+ JvContext *s = avctx->priv_data;
+ avctx->pix_fmt = PIX_FMT_PAL8;
+ dsputil_init(&s->dsp, avctx);
+ return 0;
+}
+
+/**
+ * Decode 2x2 block
+ */
+static void decode2x2(GetBitContext *gb, uint8_t *dst, int linesize)
+{
+ int i, j, v[2];
+ switch(get_bits(gb, 2)) {
+ case 1:
+ v[0] = get_bits(gb, 8);
+ for (j = 0; j < 2; j++)
+ memset(dst + j*linesize, v[0], 2);
+ break;
+ case 2:
+ v[0] = get_bits(gb, 8);
+ v[1] = get_bits(gb, 8);
+ for (j = 0; j < 2; j++)
+ for (i = 0; i < 2; i++)
+ dst[j*linesize + i] = v[get_bits1(gb)];
+ break;
+ case 3:
+ for (j = 0; j < 2; j++)
+ for (i = 0; i < 2; i++)
+ dst[j*linesize + i] = get_bits(gb, 8);
+ }
+}
+
+/**
+ * Decode 4x4 block
+ */
+static void decode4x4(GetBitContext *gb, uint8_t *dst, int linesize)
+{
+ int i, j, v[2];
+ switch(get_bits(gb, 2)) {
+ case 1:
+ v[0] = get_bits(gb, 8);
+ for (j = 0; j < 4; j++)
+ memset(dst + j*linesize, v[0], 4);
+ break;
+ case 2:
+ v[0] = get_bits(gb, 8);
+ v[1] = get_bits(gb, 8);
+ for (j = 2; j >= 0; j -= 2) {
+ for (i = 0; i < 4; i++)
+ dst[j*linesize + i] = v[get_bits1(gb)];
+ for (i = 0; i < 4; i++)
+ dst[(j+1)*linesize + i] = v[get_bits1(gb)];
+ }
+ break;
+ case 3:
+ for (j = 0; j < 2; j++)
+ for (i = 0; i < 2; i++)
+ decode2x2(gb, dst + j*2*linesize + i*2, linesize);
+ }
+}
+
+/**
+ * Decode 8x8 block
+ */
+static void decode8x8(GetBitContext *gb, uint8_t *dst, int linesize, DSPContext *dsp)
+{
+ int i, j, v[2];
+ switch(get_bits(gb, 2)) {
+ case 1:
+ v[0] = get_bits(gb, 8);
+ dsp->fill_block_tab[1](dst, v[0], linesize, 8);
+ break;
+ case 2:
+ v[0] = get_bits(gb, 8);
+ v[1] = get_bits(gb, 8);
+ for (j = 7; j >= 0; j--)
+ for (i = 0; i < 8; i++)
+ dst[j*linesize + i] = v[get_bits1(gb)];
+ break;
+ case 3:
+ for (j = 0; j < 2; j++)
+ for (i = 0; i < 2; i++)
+ decode4x4(gb, dst + j*4*linesize + i*4, linesize);
+ }
+}
+
+static int decode_frame(AVCodecContext *avctx,
+ void *data, int *data_size,
+ AVPacket *avpkt)
+{
+ JvContext *s = avctx->priv_data;
+ int buf_size = avpkt->size;
+ const uint8_t *buf = avpkt->data;
+ const uint8_t *buf_end = buf + buf_size;
+ int video_size, video_type, i, j;
+
+ video_size = AV_RL32(buf);
+ video_type = buf[4];
+ buf += 5;
+
+ if (video_size) {
+ if (avctx->reget_buffer(avctx, &s->frame) < 0) {
+ av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+ return -1;
+ }
+
+ if (video_type == 0 || video_type == 1) {
+ GetBitContext gb;
+ init_get_bits(&gb, buf, FFMIN(video_size, buf_end - buf));
+
+ for (j = 0; j < avctx->height >> 3; j++)
+ for (i = 0; i < avctx->width >> 3; i++)
+ decode8x8(&gb, s->frame.data[0] + j*8*s->frame.linesize[0] + i*8,
+ s->frame.linesize[0], &s->dsp);
+
+ buf += video_size;
+ } else if (video_type == 2) {
+ if (buf + 1 <= buf_end) {
+ int v = *buf++;
+ for (j = 0; j < avctx->height; j++)
+ memset(s->frame.data[0] + j*s->frame.linesize[0], v, avctx->width);
+ }
+ } else {
+ av_log(avctx, AV_LOG_WARNING, "unsupported frame type %i\n", video_type);
+ return AVERROR_INVALIDDATA;
+ }
+ }
+
+ if (buf < buf_end) {
+ for (i = 0; i < AVPALETTE_COUNT && buf + 3 <= buf_end; i++) {
+ s->palette[i] = AV_RB24(buf) << 2;
+ buf += 3;
+ }
+ s->palette_has_changed = 1;
+ }
+
+ if (video_size) {
+ s->frame.key_frame = 1;
+ s->frame.pict_type = FF_I_TYPE;
+ s->frame.palette_has_changed = s->palette_has_changed;
+ s->palette_has_changed = 0;
+ memcpy(s->frame.data[1], s->palette, AVPALETTE_SIZE);
+
+ *data_size = sizeof(AVFrame);
+ *(AVFrame*)data = s->frame;
+ }
+
+ return buf_size;
+}
+
+static av_cold int decode_close(AVCodecContext *avctx)
+{
+ JvContext *s = avctx->priv_data;
+
+ if(s->frame.data[0])
+ avctx->release_buffer(avctx, &s->frame);
+
+ return 0;
+}
+
+AVCodec ff_jv_decoder = {
+ .name = "jv",
+ .long_name = NULL_IF_CONFIG_SMALL("Bitmap Brothers JV video"),
+ .type = CODEC_TYPE_VIDEO,
+ .id = CODEC_ID_JV,
+ .priv_data_size = sizeof(JvContext),
+ .init = decode_init,
+ .close = decode_close,
+ .decode = decode_frame,
+ .capabilities = CODEC_CAP_DR1,
+};
--
1.7.1
-- Peter
(A907 E02F A6E5 0CD2 34CD 20D2 6760 79C5 AC40 DD6B)
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 198 bytes
Desc: Digital signature
URL: <http://lists.mplayerhq.hu/pipermail/ffmpeg-devel/attachments/20110309/a7a63164/attachment.pgp>
More information about the ffmpeg-devel
mailing list