[FFmpeg-devel] [PATCH 2/4] Silicon Graphics Motion Video Compressor 1 & 2 decoder
Peter Ross
pross at xvid.org
Tue Dec 11 11:26:15 CET 2012
Signed-off-by: Peter Ross <pross at xvid.org>
---
Changelog | 1 +
doc/general.texi | 2 +
libavcodec/Makefile | 2 +
libavcodec/allcodecs.c | 2 +
libavcodec/avcodec.h | 2 +
libavcodec/codec_desc.c | 14 +++
libavcodec/mvcdec.c | 284 ++++++++++++++++++++++++++++++++++++++++++++++++
7 files changed, 307 insertions(+)
create mode 100644 libavcodec/mvcdec.c
diff --git a/Changelog b/Changelog
index e8e6911..93f34e3 100644
--- a/Changelog
+++ b/Changelog
@@ -41,6 +41,7 @@ version <next>:
- VobSub demuxer
- JSON captions for TED talks decoding support
- SGI RLE 8-bit decoder
+- Silicon Graphics Motion Video Compressor 1 & 2 decoder
version 1.0:
diff --git a/doc/general.texi b/doc/general.texi
index eb12364..22988b2 100644
--- a/doc/general.texi
+++ b/doc/general.texi
@@ -667,6 +667,8 @@ following image formats are supported:
@item SGI RLE 8-bit @tab @tab X
@item Sierra VMD video @tab @tab X
@tab Used in Sierra VMD files.
+ at item Silicon Graphics Motion Video Compressor 1 (MVC1) @tab @tab X
+ at item Silicon Graphics Motion Video Compressor 2 (MVC2) @tab @tab X
@item Smacker video @tab @tab X
@tab Video encoding used in Smacker.
@item SMPTE VC-1 @tab @tab X
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 9e6edc1..087417b 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -310,6 +310,8 @@ OBJS-$(CONFIG_MSVIDEO1_DECODER) += msvideo1.o
OBJS-$(CONFIG_MSVIDEO1_ENCODER) += msvideo1enc.o elbg.o
OBJS-$(CONFIG_MSZH_DECODER) += lcldec.o
OBJS-$(CONFIG_MTS2_DECODER) += mss4.o mss34dsp.o
+OBJS-$(CONFIG_MVC1_DECODER) += mvcdec.o
+OBJS-$(CONFIG_MVC2_DECODER) += mvcdec.o
OBJS-$(CONFIG_MXPEG_DECODER) += mxpegdec.o mjpegdec.o mjpeg.o
OBJS-$(CONFIG_NELLYMOSER_DECODER) += nellymoserdec.o nellymoser.o
OBJS-$(CONFIG_NELLYMOSER_ENCODER) += nellymoserenc.o nellymoser.o \
diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
index 5dcd509..edeb3fb 100644
--- a/libavcodec/allcodecs.c
+++ b/libavcodec/allcodecs.c
@@ -183,6 +183,8 @@ void avcodec_register_all(void)
REGISTER_ENCDEC (MSVIDEO1, msvideo1);
REGISTER_DECODER (MSZH, mszh);
REGISTER_DECODER (MTS2, mts2);
+ REGISTER_DECODER (MVC1, mvc1);
+ REGISTER_DECODER (MVC2, mvc2);
REGISTER_DECODER (MXPEG, mxpeg);
REGISTER_DECODER (NUV, nuv);
REGISTER_DECODER (PAF_VIDEO, paf_video);
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index b9317f0..47b0869 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -286,6 +286,8 @@ enum AVCodecID {
AV_CODEC_ID_CPIA = MKBETAG('C','P','I','A'),
AV_CODEC_ID_XFACE = MKBETAG('X','F','A','C'),
AV_CODEC_ID_SGIRLE = MKBETAG('S','G','I','R'),
+ AV_CODEC_ID_MVC1 = MKBETAG('M','V','C','1'),
+ AV_CODEC_ID_MVC2 = MKBETAG('M','V','C','2'),
/* various PCM "codecs" */
AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
diff --git a/libavcodec/codec_desc.c b/libavcodec/codec_desc.c
index 4ba31e9..de61d0e 100644
--- a/libavcodec/codec_desc.c
+++ b/libavcodec/codec_desc.c
@@ -1066,6 +1066,20 @@ static const AVCodecDescriptor codec_descriptors[] = {
.props = AV_CODEC_PROP_INTRA_ONLY | AV_CODEC_PROP_LOSSLESS,
},
{
+ .id = AV_CODEC_ID_MVC1,
+ .type = AVMEDIA_TYPE_VIDEO,
+ .name = "mvc1",
+ .long_name = NULL_IF_CONFIG_SMALL("Silicon Graphics Motion Video Compressor 1"),
+ .props = AV_CODEC_PROP_INTRA_ONLY | AV_CODEC_PROP_LOSSY,
+ },
+ {
+ .id = AV_CODEC_ID_MVC2,
+ .type = AVMEDIA_TYPE_VIDEO,
+ .name = "mvc2",
+ .long_name = NULL_IF_CONFIG_SMALL("Silicon Graphics Motion Video Compressor 2"),
+ .props = AV_CODEC_PROP_INTRA_ONLY | AV_CODEC_PROP_LOSSY,
+ },
+ {
.id = AV_CODEC_ID_MXPEG,
.type = AVMEDIA_TYPE_VIDEO,
.name = "mxpeg",
diff --git a/libavcodec/mvcdec.c b/libavcodec/mvcdec.c
new file mode 100644
index 0000000..43d660a
--- /dev/null
+++ b/libavcodec/mvcdec.c
@@ -0,0 +1,284 @@
+/*
+ * Silicon Graphics Motion Video Compressor 1 & 2 decoder
+ * Copyright (c) 2012 Peter Ross
+ *
+ * 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
+ * Silicon Graphics Motion Video Compressor 1 & 2 decoder
+ */
+
+#include "libavutil/intreadwrite.h"
+#include "avcodec.h"
+#include "bytestream.h"
+
+typedef struct MvcContext {
+ AVFrame frame;
+ int vflip;
+} MvcContext;
+
+static av_cold int mvc_decode_init(AVCodecContext *avctx)
+{
+ MvcContext *s = avctx->priv_data;
+ int width = avctx->width;
+ int height = avctx->height;
+
+ if (avctx->codec_id == AV_CODEC_ID_MVC1) {
+ width += 3;
+ height += 3;
+ }
+ width &= ~3;
+ height &= ~3;
+ if (width != avctx->width || height != avctx->height)
+ avcodec_set_dimensions(avctx, width, height);
+
+ avctx->pix_fmt = (avctx->codec_id == AV_CODEC_ID_MVC1) ? AV_PIX_FMT_RGB555 : AV_PIX_FMT_BGRA;
+ avcodec_get_frame_defaults(&s->frame);
+ s->frame.data[0] = NULL;
+
+ s->vflip = avctx->extradata_size >= 9 && !memcmp(avctx->extradata + avctx->extradata_size - 9, "BottomUp", 9);
+ return 0;
+}
+
+static void decode_mvc1(AVCodecContext *avctx, GetByteContext *gb, uint8_t *dst_start, int width, int height, int linesize)
+{
+ uint8_t *dst;
+ uint16_t v[8];
+ int mask, x, y, i;
+
+ x = y= 0;
+ while (bytestream2_get_bytes_left(gb) >= 6) {
+ mask = bytestream2_get_be16u(gb);
+ v[0] = bytestream2_get_be16u(gb);
+ v[1] = bytestream2_get_be16u(gb);
+ if ((v[0] & 0x8000)) {
+ if (bytestream2_get_bytes_left(gb) < 12) {
+ av_log(avctx, AV_LOG_WARNING, "buffer overflow\n");
+ return;
+ }
+ for (i = 2; i < 8; i++)
+ v[i] = bytestream2_get_be16u(gb);
+ } else {
+ v[2] = v[4] = v[6] = v[0];
+ v[3] = v[5] = v[7] = v[1];
+ }
+
+#define PIX16(target, true, false) \
+ i = (mask & target) ? true : false; \
+ AV_WN16A(dst, (v[i] & 0x7C00) | (v[i] & 0x3E0) | (v[i] & 0x1F)); \
+ dst += 2;
+
+#define ROW16(row, a1, a0, b1, b0) \
+ dst = dst_start + (y + row) * linesize + x * 2; \
+ PIX16(1 << (row * 4), a1, a0) \
+ PIX16(1 << (row * 4 + 1), a1, a0) \
+ PIX16(1 << (row * 4 + 2), b1, b0) \
+ PIX16(1 << (row * 4 + 3), b1, b0)
+
+ ROW16(0, 0, 1, 2, 3);
+ ROW16(1, 0, 1, 2, 3);
+ ROW16(2, 4, 5, 6, 7);
+ ROW16(3, 4, 5, 6, 7);
+
+ x += 4;
+ if (x >= width) {
+ y += 4;
+ if (y >= height) {
+ break;
+ }
+ x = 0;
+ }
+ }
+}
+
+static void set_4x4_block(uint8_t *dst, int linesize, uint32_t pixel)
+{
+ int i, j;
+ for (j = 0; j < 4; j++)
+ for (i = 0; i < 4; i++)
+ AV_WN32A(dst + j * linesize + i * 4, pixel);
+}
+
+#define PIX32(target, true, false) \
+ AV_WN32A(dst, (mask & target) ? v[true] : v[false]); \
+ dst += 4;
+
+#define ROW32(row, a1, a0, b1, b0) \
+ dst = dst_start + (y + row) * linesize + x * 4; \
+ PIX32(1 << (row * 4), a1, a0) \
+ PIX32(1 << (row * 4 + 1), a1, a0) \
+ PIX32(1 << (row * 4 + 2), b1, b0) \
+ PIX32(1 << (row * 4 + 3), b1, b0)
+
+#define MVC2_BLOCK \
+ ROW32(0, 1, 0, 3, 2); \
+ ROW32(1, 1, 0, 3, 2); \
+ ROW32(2, 5, 4, 7, 6); \
+ ROW32(3, 5, 4, 7, 6);
+
+static void decode_mvc2(AVCodecContext *avctx, GetByteContext *gb, uint8_t *dst_start, int width, int height, int linesize, int vflip)
+{
+ uint8_t *dst;
+ uint32_t color[128], v[8];
+ int w, h, nb_colors, i, x, y, p0, p1, mask;
+
+ if (bytestream2_get_bytes_left(gb) < 6)
+ return;
+
+ w = bytestream2_get_be16u(gb);
+ h = bytestream2_get_be16u(gb);
+ if ((w & ~3) != width || (h & ~3) != height)
+ av_log(avctx, AV_LOG_WARNING, "dimension mismatch\n");
+
+ if (bytestream2_get_byteu(gb)) {
+ av_log_ask_for_sample(avctx, "bitmap feature\n");
+ return;
+ }
+
+ nb_colors = bytestream2_get_byteu(gb);
+ if (bytestream2_get_bytes_left(gb) < nb_colors * 3)
+ return;
+ for (i = 0; i < FFMIN(nb_colors, 128); i++)
+ color[i] = 0xFF000000 | bytestream2_get_be24u(gb);
+ if (nb_colors > 128)
+ bytestream2_skip(gb, (nb_colors - 128) * 3);
+
+ if (vflip) {
+ dst_start += (height - 1) * linesize;
+ linesize = -linesize;
+ }
+ x = y = 0;
+ while (bytestream2_get_bytes_left(gb) >= 1) {
+ p0 = bytestream2_get_byteu(gb);
+ if ((p0 & 0x80)) {
+ if ((p0 & 0x40)) {
+ p0 &= 0x3F;
+ p0 = (p0 << 2) | (p0 >> 4);
+ set_4x4_block(dst_start + y * linesize + x * 4, linesize, 0xFF000000 | (p0 << 16) | (p0 << 8) | p0);
+ } else {
+ int g, r;
+ p0 &= 0x3F;
+ p0 = (p0 << 2) | (p0 >> 4);
+ if (bytestream2_get_bytes_left(gb) < 2)
+ return;
+ g = bytestream2_get_byteu(gb);
+ r = bytestream2_get_byteu(gb);
+ set_4x4_block(dst_start + y * linesize + x * 4, linesize, 0xFF000000 | (r << 16) | (g << 8) | p0);
+ }
+ } else {
+ if (bytestream2_get_bytes_left(gb) < 1)
+ return;
+ p1 = bytestream2_get_byteu(gb);
+ if ((p1 & 0x80)) {
+ if ((p0 & 0x7F) == (p1 & 0x7F)) {
+ set_4x4_block(dst_start + y * linesize + x * 4, linesize, color[p0 & 0x7F]);
+ } else {
+ if (bytestream2_get_bytes_left(gb) < 2)
+ return;
+ v[0] = v[2] = v[4] = v[6] = color[p0 & 0x7F];
+ v[1] = v[3] = v[5] = v[7] = color[p1 & 0x7F];
+ mask = bytestream2_get_le16u(gb);
+ MVC2_BLOCK
+ }
+ } else {
+ if (bytestream2_get_bytes_left(gb) < 8)
+ return;
+ v[0] = color[p0 & 0x7F];
+ v[1] = color[p1 & 0x7F];
+ for (i = 2; i < 8; i++)
+ v[i] = color[bytestream2_get_byteu(gb) & 0x7F];
+ mask = bytestream2_get_le16u(gb);
+ MVC2_BLOCK
+ }
+ }
+
+ x += 4;
+ if (x >= width) {
+ y += 4;
+ if (y >= height)
+ break;
+ x = 0;
+ }
+ }
+}
+
+static int mvc_decode_frame(AVCodecContext *avctx,
+ void *data, int *data_size,
+ AVPacket *avpkt)
+{
+ MvcContext *s = avctx->priv_data;
+ GetByteContext gb;
+
+ s->frame.reference = 3;
+ s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE |
+ FF_BUFFER_HINTS_REUSABLE | FF_BUFFER_HINTS_READABLE;
+ if (avctx->reget_buffer(avctx, &s->frame)) {
+ av_log (avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
+ return -1;
+ }
+
+ bytestream2_init(&gb, avpkt->data, avpkt->size);
+ if (avctx->codec_id == AV_CODEC_ID_MVC1)
+ decode_mvc1(avctx, &gb, s->frame.data[0], avctx->width, avctx->height, s->frame.linesize[0]);
+ else
+ decode_mvc2(avctx, &gb, s->frame.data[0], avctx->width, avctx->height, s->frame.linesize[0], s->vflip);
+
+ *data_size = sizeof(AVFrame);
+ *(AVFrame*)data = s->frame;
+
+ return avpkt->size;
+}
+
+static av_cold int mvc_decode_end(AVCodecContext *avctx)
+{
+ MvcContext *s = avctx->priv_data;
+
+ if (s->frame.data[0])
+ avctx->release_buffer(avctx, &s->frame);
+
+ return 0;
+}
+
+#if CONFIG_MVC1_DECODER
+AVCodec ff_mvc1_decoder = {
+ .name = "mvc1",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_CODEC_ID_MVC1,
+ .priv_data_size = sizeof(MvcContext),
+ .init = mvc_decode_init,
+ .close = mvc_decode_end,
+ .decode = mvc_decode_frame,
+ .capabilities = CODEC_CAP_DR1,
+ .long_name = NULL_IF_CONFIG_SMALL("Silicon Graphics Motion Video Compressor 1"),
+};
+#endif
+
+#if CONFIG_MVC1_DECODER
+AVCodec ff_mvc2_decoder = {
+ .name = "mvc2",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_CODEC_ID_MVC2,
+ .priv_data_size = sizeof(MvcContext),
+ .init = mvc_decode_init,
+ .close = mvc_decode_end,
+ .decode = mvc_decode_frame,
+ .capabilities = CODEC_CAP_DR1,
+ .long_name = NULL_IF_CONFIG_SMALL("Silicon Graphics Motion Video Compressor 2"),
+};
+#endif
--
1.8.0
-- Peter
(A907 E02F A6E5 0CD2 34CD 20D2 6760 79C5 AC40 DD6B)
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