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-rw-r--r--libavcodec/012v.c155
1 files changed, 155 insertions, 0 deletions
diff --git a/libavcodec/012v.c b/libavcodec/012v.c
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--- /dev/null
+++ b/libavcodec/012v.c
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+/*
+ * 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 = AV_PIX_FMT_YUV422P16;
+ avctx->bits_per_raw_sample = 10;
+
+ if (avctx->codec_tag == MKTAG('a', '1', '2', 'v'))
+ avpriv_request_sample(avctx, "transparency");
+
+ return 0;
+}
+
+static int zero12v_decode_frame(AVCodecContext *avctx, void *data,
+ int *got_frame, AVPacket *avpkt)
+{
+ int line, ret;
+ const int width = avctx->width;
+ AVFrame *pic = data;
+ uint16_t *y, *u, *v;
+ const uint8_t *line_end, *src = avpkt->data;
+ int stride = avctx->width * 8 / 3;
+
+ if (width <= 1 || avctx->height <= 0) {
+ av_log(avctx, AV_LOG_ERROR, "Dimensions %dx%d not supported.\n", width, avctx->height);
+ return AVERROR_INVALIDDATA;
+ }
+
+ if ( avctx->codec_tag == MKTAG('0', '1', '2', 'v')
+ && avpkt->size % avctx->height == 0
+ && avpkt->size / avctx->height * 3 >= width * 8)
+ stride = avpkt->size / avctx->height;
+
+ 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;
+ }
+
+ if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
+ return ret;
+
+ pic->pict_type = AV_PICTURE_TYPE_I;
+ pic->key_frame = 1;
+
+ line_end = avpkt->data + stride;
+ for (line = 0; line < avctx->height; line++) {
+ uint16_t y_temp[6] = {0x8000, 0x8000, 0x8000, 0x8000, 0x8000, 0x8000};
+ uint16_t u_temp[3] = {0x8000, 0x8000, 0x8000};
+ uint16_t v_temp[3] = {0x8000, 0x8000, 0x8000};
+ int x;
+ 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]);
+
+ for (x = 0; x < width; x += 6) {
+ uint32_t t;
+
+ if (width - x < 6 || line_end - src < 16) {
+ y = y_temp;
+ u = u_temp;
+ v = v_temp;
+ }
+
+ if (line_end - src < 4)
+ break;
+
+ t = AV_RL32(src);
+ src += 4;
+ *u++ = t << 6 & 0xFFC0;
+ *y++ = t >> 4 & 0xFFC0;
+ *v++ = t >> 14 & 0xFFC0;
+
+ if (line_end - src < 4)
+ break;
+
+ t = AV_RL32(src);
+ src += 4;
+ *y++ = t << 6 & 0xFFC0;
+ *u++ = t >> 4 & 0xFFC0;
+ *y++ = t >> 14 & 0xFFC0;
+
+ if (line_end - src < 4)
+ break;
+
+ t = AV_RL32(src);
+ src += 4;
+ *v++ = t << 6 & 0xFFC0;
+ *y++ = t >> 4 & 0xFFC0;
+ *u++ = t >> 14 & 0xFFC0;
+
+ if (line_end - src < 4)
+ break;
+
+ t = AV_RL32(src);
+ src += 4;
+ *y++ = t << 6 & 0xFFC0;
+ *v++ = t >> 4 & 0xFFC0;
+ *y++ = t >> 14 & 0xFFC0;
+
+ if (width - x < 6)
+ break;
+ }
+
+ if (x < width) {
+ y = x + (uint16_t *)(pic->data[0] + line * pic->linesize[0]);
+ u = x/2 + (uint16_t *)(pic->data[1] + line * pic->linesize[1]);
+ v = x/2 + (uint16_t *)(pic->data[2] + line * pic->linesize[2]);
+ memcpy(y, y_temp, sizeof(*y) * (width - x));
+ memcpy(u, u_temp, sizeof(*u) * (width - x + 1) / 2);
+ memcpy(v, v_temp, sizeof(*v) * (width - x + 1) / 2);
+ }
+
+ line_end += stride;
+ src = line_end - stride;
+ }
+
+ *got_frame = 1;
+
+ return avpkt->size;
+}
+
+AVCodec ff_zero12v_decoder = {
+ .name = "012v",
+ .long_name = NULL_IF_CONFIG_SMALL("Uncompressed 4:2:2 10-bit"),
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_CODEC_ID_012V,
+ .init = zero12v_decode_init,
+ .decode = zero12v_decode_frame,
+ .capabilities = CODEC_CAP_DR1,
+};