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-rw-r--r--libavcodec/libutvideodec.cpp212
1 files changed, 212 insertions, 0 deletions
diff --git a/libavcodec/libutvideodec.cpp b/libavcodec/libutvideodec.cpp
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+++ b/libavcodec/libutvideodec.cpp
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+/*
+ * Copyright (c) 2011 Derek Buitenhuis
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation;
+ * version 2 of the License.
+ *
+ * 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
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU 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
+ * Known FOURCCs:
+ * 'ULY0' (YCbCr 4:2:0), 'ULY2' (YCbCr 4:2:2), 'ULRG' (RGB), 'ULRA' (RGBA),
+ * 'ULH0' (YCbCr 4:2:0 BT.709), 'ULH2' (YCbCr 4:2:2 BT.709)
+ */
+
+extern "C" {
+#include "avcodec.h"
+}
+
+#include "libutvideo.h"
+#include "get_bits.h"
+
+static av_cold int utvideo_decode_init(AVCodecContext *avctx)
+{
+ UtVideoContext *utv = (UtVideoContext *)avctx->priv_data;
+ UtVideoExtra info;
+ int format;
+ int begin_ret;
+
+ if (avctx->extradata_size != 4*4) {
+ av_log(avctx, AV_LOG_ERROR, "Extradata size mismatch.\n");
+ return -1;
+ }
+
+ /* Read extradata */
+ info.version = AV_RL32(avctx->extradata);
+ info.original_format = AV_RL32(avctx->extradata + 4);
+ info.frameinfo_size = AV_RL32(avctx->extradata + 8);
+ info.flags = AV_RL32(avctx->extradata + 12);
+
+ /* Pick format based on FOURCC */
+ switch (avctx->codec_tag) {
+#ifdef UTV_BT709
+ case MKTAG('U', 'L', 'H', '0'):
+ avctx->pix_fmt = AV_PIX_FMT_YUV420P;
+ avctx->colorspace = AVCOL_SPC_BT709;
+ format = UTVF_YV12;
+ break;
+ case MKTAG('U', 'L', 'H', '2'):
+ avctx->pix_fmt = AV_PIX_FMT_YUYV422;
+ avctx->colorspace = AVCOL_SPC_BT709;
+ format = UTVF_YUY2;
+ break;
+#endif
+ case MKTAG('U', 'L', 'Y', '0'):
+ avctx->pix_fmt = AV_PIX_FMT_YUV420P;
+ format = UTVF_YV12;
+ break;
+ case MKTAG('U', 'L', 'Y', '2'):
+ avctx->pix_fmt = AV_PIX_FMT_YUYV422;
+ format = UTVF_YUY2;
+ break;
+ case MKTAG('U', 'L', 'R', 'G'):
+ avctx->pix_fmt = AV_PIX_FMT_BGR24;
+ format = UTVF_NFCC_BGR_BU;
+ break;
+ case MKTAG('U', 'L', 'R', 'A'):
+ avctx->pix_fmt = AV_PIX_FMT_RGB32;
+ format = UTVF_NFCC_BGRA_BU;
+ break;
+ default:
+ av_log(avctx, AV_LOG_ERROR,
+ "Not a Ut Video FOURCC: %X\n", avctx->codec_tag);
+ return -1;
+ }
+
+ /* Only allocate the buffer once */
+ utv->buf_size = avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height);
+ utv->buffer = (uint8_t *)av_malloc(utv->buf_size * sizeof(uint8_t));
+
+ if (utv->buffer == NULL) {
+ av_log(avctx, AV_LOG_ERROR, "Unable to allocate output buffer.\n");
+ return -1;
+ }
+
+ /* Allocate the output frame */
+ avctx->coded_frame = av_frame_alloc();
+
+ /* Ut Video only supports 8-bit */
+ avctx->bits_per_raw_sample = 8;
+
+ /* Is it interlaced? */
+ avctx->coded_frame->interlaced_frame = info.flags & 0x800 ? 1 : 0;
+
+ /* Apparently Ut Video doesn't store this info... */
+ avctx->coded_frame->top_field_first = 1;
+
+ /*
+ * Create a Ut Video instance. Since the function wants
+ * an "interface name" string, pass it the name of the lib.
+ */
+ utv->codec = CCodec::CreateInstance(UNFCC(avctx->codec_tag), "libavcodec");
+
+ /* Initialize Decoding */
+ begin_ret = utv->codec->DecodeBegin(format, avctx->width, avctx->height,
+ CBGROSSWIDTH_WINDOWS, &info, sizeof(UtVideoExtra));
+
+ /* Check to see if the decoder initlized properly */
+ if (begin_ret != 0) {
+ av_log(avctx, AV_LOG_ERROR,
+ "Could not initialize decoder: %d\n", begin_ret);
+ return -1;
+ }
+
+ return 0;
+}
+
+static int utvideo_decode_frame(AVCodecContext *avctx, void *data,
+ int *got_frame, AVPacket *avpkt)
+{
+ UtVideoContext *utv = (UtVideoContext *)avctx->priv_data;
+ AVFrame *pic = avctx->coded_frame;
+ int w = avctx->width, h = avctx->height;
+
+ /* Set flags */
+ pic->reference = 0;
+ pic->pict_type = AV_PICTURE_TYPE_I;
+ pic->key_frame = 1;
+
+ /* Decode the frame */
+ utv->codec->DecodeFrame(utv->buffer, avpkt->data, true);
+
+ /* Set the output data depending on the colorspace */
+ switch (avctx->pix_fmt) {
+ case AV_PIX_FMT_YUV420P:
+ pic->linesize[0] = w;
+ pic->linesize[1] = pic->linesize[2] = w / 2;
+ pic->data[0] = utv->buffer;
+ pic->data[2] = utv->buffer + (w * h);
+ pic->data[1] = pic->data[2] + (w * h / 4);
+ break;
+ case AV_PIX_FMT_YUYV422:
+ pic->linesize[0] = w * 2;
+ pic->data[0] = utv->buffer;
+ break;
+ case AV_PIX_FMT_BGR24:
+ case AV_PIX_FMT_RGB32:
+ /* Make the linesize negative, since Ut Video uses bottom-up BGR */
+ pic->linesize[0] = -1 * w * (avctx->pix_fmt == AV_PIX_FMT_BGR24 ? 3 : 4);
+ pic->data[0] = utv->buffer + utv->buf_size + pic->linesize[0];
+ break;
+ }
+
+ *got_frame = 1;
+ av_frame_move_ref((AVFrame*)data, pic);
+
+ return avpkt->size;
+}
+
+static av_cold int utvideo_decode_close(AVCodecContext *avctx)
+{
+ UtVideoContext *utv = (UtVideoContext *)avctx->priv_data;
+
+ /* Free output */
+ av_frame_free(&avctx->coded_frame);
+ av_freep(&utv->buffer);
+
+ /* Finish decoding and clean up the instance */
+ utv->codec->DecodeEnd();
+ CCodec::DeleteInstance(utv->codec);
+
+ return 0;
+}
+
+AVCodec ff_libutvideo_decoder = {
+ "libutvideo",
+ NULL_IF_CONFIG_SMALL("Ut Video"),
+ AVMEDIA_TYPE_VIDEO,
+ AV_CODEC_ID_UTVIDEO,
+ 0, //capabilities
+ NULL, //supported_framerates
+ NULL, //pix_fmts
+ NULL, //supported_samplerates
+ NULL, //sample_fmts
+ NULL, //channel_layouts
+ 0, //max_lowres
+ NULL, //priv_class
+ NULL, //profiles
+ sizeof(UtVideoContext),
+ NULL, //next
+ NULL, //init_thread_copy
+ NULL, //update_thread_context
+ NULL, //defaults
+ NULL, //init_static_data
+ utvideo_decode_init,
+ NULL, //encode
+ NULL, //encode2
+ utvideo_decode_frame,
+ utvideo_decode_close,
+};