012v decoder.

The decoder also supports a12v, but removes the transparency layer
since no samples with actual transparency are available for testing.

1 files changed, 172 insertions, 0 deletions

diff --git a/libavcodec/012v.c b/libavcodec/012v.c
new file mode 100644
index 0000000..b2c2790
--- /dev/null
+++ b/libavcodec/012v.c
@@ -0,0 +1,172 @@
+/*
+ * 012v decoder
+ *
+ * Copyright (C) 2012 Carl Eugen Hoyos
+ *
+ * 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 "internal.h"
+#include "libavutil/intreadwrite.h"
+
+static av_cold int zero12v_decode_init(AVCodecContext *avctx)
+{
+    avctx->pix_fmt             = PIX_FMT_YUV422P16;
+    avctx->bits_per_raw_sample = 10;
+
+    avctx->coded_frame = avcodec_alloc_frame();
+    if (!avctx->coded_frame)
+        return AVERROR(ENOMEM);
+
+    if (avctx->codec_tag == MKTAG('a', '1', '2', 'v'))
+        av_log_ask_for_sample(avctx, "Samples with actual transparency needed\n");
+
+    avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
+    avctx->coded_frame->key_frame = 1;
+    return 0;
+}
+
+static int zero12v_decode_frame(AVCodecContext *avctx, void *data,
+                                int *got_frame, AVPacket *avpkt)
+{
+    int line = 0;
+    const int width = avctx->width;
+    AVFrame *pic = avctx->coded_frame;
+    uint16_t *y, *u, *v;
+    const uint8_t *line_end, *src = avpkt->data;
+    int stride = avctx->width * 8 / 3;
+
+    if (pic->data[0])
+        avctx->release_buffer(avctx, pic);
+
+    if (width == 1) {
+        av_log(avctx, AV_LOG_ERROR, "Width 1 not supported.\n");
+        return AVERROR_INVALIDDATA;
+    }
+    if (avpkt->size < avctx->height * stride) {
+        av_log(avctx, AV_LOG_ERROR, "Packet too small: %d instead of %d\n",
+               avpkt->size, avctx->height * stride);
+        return AVERROR_INVALIDDATA;
+    }
+
+    pic->reference = 0;
+    if (ff_get_buffer(avctx, pic) < 0)
+        return AVERROR_INVALIDDATA;;
+
+    y = (uint16_t *)pic->data[0];
+    u = (uint16_t *)pic->data[1];
+    v = (uint16_t *)pic->data[2];
+    line_end = avpkt->data + stride;
+
+    while (line++ < avctx->height) {
+        while (1) {
+            uint32_t t = AV_RL32(src);
+            src += 4;
+            *u++ = t <<  6 & 0xFFC0;
+            *y++ = t >>  4 & 0xFFC0;
+            *v++ = t >> 14 & 0xFFC0;
+
+            if (src >= line_end - 1) {
+                *y = 0x80;
+                src++;
+                line_end += stride;
+                y = (uint16_t *)(pic->data[0] + line * pic->linesize[0]);
+                u = (uint16_t *)(pic->data[1] + line * pic->linesize[1]);
+                v = (uint16_t *)(pic->data[2] + line * pic->linesize[2]);
+                break;
+            }
+
+            t = AV_RL32(src);
+            src += 4;
+            *y++ = t <<  6 & 0xFFC0;
+            *u++ = t >>  4 & 0xFFC0;
+            *y++ = t >> 14 & 0xFFC0;
+            if (src >= line_end - 2) {
+                if (!(width & 1)) {
+                    *y = 0x80;
+                    src += 2;
+                }
+                line_end += stride;
+                y = (uint16_t *)(pic->data[0] + line * pic->linesize[0]);
+                u = (uint16_t *)(pic->data[1] + line * pic->linesize[1]);
+                v = (uint16_t *)(pic->data[2] + line * pic->linesize[2]);
+                break;
+            }
+
+            t = AV_RL32(src);
+            src += 4;
+            *v++ = t <<  6 & 0xFFC0;
+            *y++ = t >>  4 & 0xFFC0;
+            *u++ = t >> 14 & 0xFFC0;
+
+            if (src >= line_end - 1) {
+                *y = 0x80;
+                src++;
+                line_end += stride;
+                y = (uint16_t *)(pic->data[0] + line * pic->linesize[0]);
+                u = (uint16_t *)(pic->data[1] + line * pic->linesize[1]);
+                v = (uint16_t *)(pic->data[2] + line * pic->linesize[2]);
+                break;
+            }
+
+            t = AV_RL32(src);
+            src += 4;
+            *y++ = t <<  6 & 0xFFC0;
+            *v++ = t >>  4 & 0xFFC0;
+            *y++ = t >> 14 & 0xFFC0;
+
+            if (src >= line_end - 2) {
+                if (width & 1) {
+                    *y = 0x80;
+                    src += 2;
+                }
+                line_end += stride;
+                y = (uint16_t *)(pic->data[0] + line * pic->linesize[0]);
+                u = (uint16_t *)(pic->data[1] + line * pic->linesize[1]);
+                v = (uint16_t *)(pic->data[2] + line * pic->linesize[2]);
+                break;
+            }
+        }
+    }
+
+    *got_frame = 1;
+    *(AVFrame*)data= *avctx->coded_frame;
+
+    return avpkt->size;
+}
+
+static av_cold int zero12v_decode_close(AVCodecContext *avctx)
+{
+    AVFrame *pic = avctx->coded_frame;
+    if (pic->data[0])
+        avctx->release_buffer(avctx, pic);
+    av_freep(&avctx->coded_frame);
+
+    return 0;
+}
+
+AVCodec ff_zero12v_decoder = {
+    .name           = "012v",
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_012V,
+    .init           = zero12v_decode_init,
+    .close          = zero12v_decode_close,
+    .decode         = zero12v_decode_frame,
+    .capabilities   = CODEC_CAP_DR1,
+    .long_name      = NULL_IF_CONFIG_SMALL("Uncompressed 4:2:2 10-bit"),
+};