avcodec: add M101 decoder

Fixes Ticket 2611

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavcodec/Makefile

@@ -351,6 +351,7 @@ OBJS-$(CONFIG_KMVC_DECODER)            += kmvc.o
 OBJS-$(CONFIG_LAGARITH_DECODER)        += lagarith.o lagarithrac.o
 OBJS-$(CONFIG_LJPEG_ENCODER)           += ljpegenc.o mjpegenc_common.o
 OBJS-$(CONFIG_LOCO_DECODER)            += loco.o
+OBJS-$(CONFIG_M101_DECODER)            += m101.o
 OBJS-$(CONFIG_MACE3_DECODER)           += mace.o
 OBJS-$(CONFIG_MACE6_DECODER)           += mace.o
 OBJS-$(CONFIG_MDEC_DECODER)            += mdec.o mpeg12.o mpeg12data.o

libavcodec/allcodecs.c

@@ -218,6 +218,7 @@ void avcodec_register_all(void)
     REGISTER_DECODER(LAGARITH,          lagarith);
     REGISTER_ENCODER(LJPEG,             ljpeg);
     REGISTER_DECODER(LOCO,              loco);
+    REGISTER_DECODER(M101,              m101);
     REGISTER_DECODER(MDEC,              mdec);
     REGISTER_DECODER(MIMIC,             mimic);
     REGISTER_ENCDEC (MJPEG,             mjpeg);

libavcodec/avcodec.h

@@ -386,6 +386,7 @@ enum AVCodecID {
     AV_CODEC_ID_DXV,
     AV_CODEC_ID_SCREENPRESSO,
     AV_CODEC_ID_RSCC,
+    AV_CODEC_ID_M101,
 
     AV_CODEC_ID_Y41P = 0x8000,
     AV_CODEC_ID_AVRP,

libavcodec/codec_desc.c

@@ -947,6 +947,13 @@ static const AVCodecDescriptor codec_descriptors[] = {
         .long_name = NULL_IF_CONFIG_SMALL("AJA Kona 10-bit RGB Codec"),
         .props     = AV_CODEC_PROP_INTRA_ONLY | AV_CODEC_PROP_LOSSLESS,
     },
+    {
+        .id        = AV_CODEC_ID_M101,
+        .type      = AVMEDIA_TYPE_VIDEO,
+        .name      = "m101",
+        .long_name = NULL_IF_CONFIG_SMALL("Matrox Uncompressed SD"),
+        .props     = AV_CODEC_PROP_INTRA_ONLY | AV_CODEC_PROP_LOSSLESS,
+    },
     {
         .id        = AV_CODEC_ID_MVC1,
         .type      = AVMEDIA_TYPE_VIDEO,

libavcodec/m101.c

@@ -0,0 +1,116 @@
+/*
+ * Copyright (c) 2016 Michael Niedermayer
+ *
+ * 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 "avcodec.h"
+#include "internal.h"
+
+
+static av_cold int m101_decode_init(AVCodecContext *avctx)
+{
+    if (avctx->extradata_size < 6*4)
+        return AVERROR_INVALIDDATA;
+
+    if (avctx->extradata[2*4] == 10)
+        avctx->pix_fmt = AV_PIX_FMT_YUV422P10;
+    else
+        avctx->pix_fmt = AV_PIX_FMT_YUYV422;
+
+
+    return 0;
+}
+
+static int m101_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
+                      AVPacket *avpkt)
+{
+    const uint8_t *buf = avpkt->data;
+    int stride, ret;
+    int x, y;
+    int min_stride = 2 * avctx->width;
+    uint8_t *line;
+    int bits = avctx->extradata[2*4];
+    AVFrame *frame = data;
+
+    if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
+        return ret;
+    frame->pict_type = AV_PICTURE_TYPE_I;
+    frame->key_frame = 1;
+
+    stride = AV_RL32(avctx->extradata + 5*4);
+
+    if (avctx->pix_fmt == AV_PIX_FMT_YUV422P10)
+        min_stride = (avctx->width + 15) / 16 * 20;
+
+    if (stride < min_stride || avpkt->size < stride * (uint64_t)avctx->height) {
+        av_log(avctx, AV_LOG_ERROR, "stride (%d) is invalid for packet sized %d\n",
+               stride, avpkt->size);
+        return AVERROR_INVALIDDATA;
+    }
+
+    line = frame->data[0];
+    frame->interlaced_frame = ((avctx->extradata[3*4] & 3) != 3);
+    if (frame->interlaced_frame)
+        frame->top_field_first = avctx->extradata[3*4] & 1;
+
+    for (y = 0; y < avctx->height; y++) {
+        int src_y = y;
+        if (frame->interlaced_frame)
+            src_y = ((y&1)^frame->top_field_first) ? y/2 : (y/2 + avctx->height/2);
+        if (bits == 8) {
+            for (x = 0; x < avctx->width; x++) {
+                line[y*frame->linesize[0] + 2*x + 0] = buf[src_y*stride + 2*x + 0];
+                line[y*frame->linesize[0] + 2*x + 1] = buf[src_y*stride + 2*x + 1];
+            }
+        } else {
+            int block;
+            uint16_t *luma = (uint16_t*)&frame->data[0][y*frame->linesize[0]];
+            uint16_t *cb   = (uint16_t*)&frame->data[1][y*frame->linesize[1]];
+            uint16_t *cr   = (uint16_t*)&frame->data[2][y*frame->linesize[2]];
+            for (block = 0; 16*block < avctx->width; block ++) {
+                const uint8_t *buf_src = buf + src_y*stride + 40*block;
+                for (x = 0; x < 16 && x + 16*block < avctx->width; x++) {
+                    int xd = x + 16*block;
+                    if (!(x&1)) {
+                        luma [xd] = (4*buf_src[2*x + 0]) +  (buf_src[32 + (x>>1)]    &3);
+                        cb[xd>>1] = (4*buf_src[2*x + 1]) + ((buf_src[32 + (x>>1)]>>2)&3);
+                        cr[xd>>1] = (4*buf_src[2*x + 3]) +  (buf_src[32 + (x>>1)]>>6);
+                    } else {
+                        luma [xd] = (4*buf_src[2*x + 0]) + ((buf_src[32 + (x>>1)]>>4)&3);
+                    }
+                }
+            }
+        }
+    }
+
+    *got_frame = 1;
+    return avpkt->size;
+}
+
+AVCodec ff_m101_decoder = {
+    .name           = "m101",
+    .long_name      = NULL_IF_CONFIG_SMALL("Matrox Uncompressed SD"),
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_M101,
+    .priv_data_size = 0,
+    .init           = m101_decode_init,
+    .decode         = m101_decode_frame,
+    .capabilities   = AV_CODEC_CAP_DR1,
+};

libavcodec/version.h

@@ -28,7 +28,7 @@
 #include "libavutil/version.h"
 
 #define LIBAVCODEC_VERSION_MAJOR  57
-#define LIBAVCODEC_VERSION_MINOR  38
+#define LIBAVCODEC_VERSION_MINOR  39
 #define LIBAVCODEC_VERSION_MICRO 100
 
 #define LIBAVCODEC_VERSION_INT  AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \