diff options
Diffstat (limited to 'libavcodec/libutvideodec.cpp')
| -rw-r--r-- | libavcodec/libutvideodec.cpp | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/libavcodec/libutvideodec.cpp b/libavcodec/libutvideodec.cpp new file mode 100644 index 0000000..4f5b91f --- /dev/null +++ b/libavcodec/libutvideodec.cpp @@ -0,0 +1,199 @@ +/* + * 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) + */ + +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) { + case MKTAG('U', 'L', 'Y', '0'): + avctx->pix_fmt = PIX_FMT_YUV420P; + format = UTVF_YV12; + break; + case MKTAG('U', 'L', 'Y', '2'): + avctx->pix_fmt = PIX_FMT_YUYV422; + format = UTVF_YUY2; + break; + case MKTAG('U', 'L', 'R', 'G'): + avctx->pix_fmt = PIX_FMT_BGR24; + format = UTVF_RGB24_WIN; + break; + case MKTAG('U', 'L', 'R', 'A'): + avctx->pix_fmt = PIX_FMT_RGB32; + format = UTVF_RGB32_WIN; + 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 = avcodec_alloc_frame(); + + /* 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 *data_size, 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 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 PIX_FMT_YUYV422: + pic->linesize[0] = w * 2; + pic->data[0] = utv->buffer; + break; + case PIX_FMT_BGR24: + case PIX_FMT_RGB32: + /* Make the linesize negative, since Ut Video uses bottom-up BGR */ + pic->linesize[0] = -1 * w * (avctx->pix_fmt == PIX_FMT_BGR24 ? 3 : 4); + pic->data[0] = utv->buffer + utv->buf_size + pic->linesize[0]; + break; + } + + *data_size = sizeof(AVFrame); + *(AVFrame *)data = *pic; + + return avpkt->size; +} + +static av_cold int utvideo_decode_close(AVCodecContext *avctx) +{ + UtVideoContext *utv = (UtVideoContext *)avctx->priv_data; + + /* Free output */ + av_freep(&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, +}; |
