From 373a6dda5422186bc057297342a9e559a564595e Mon Sep 17 00:00:00 2001 From: Nidhi Makhijani Date: Sat, 5 Jul 2014 21:04:05 +0530 Subject: cljr: split decoder and encoder Signed-off-by: Diego Biurrun --- libavcodec/cljrdec.c | 95 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 95 insertions(+) create mode 100644 libavcodec/cljrdec.c (limited to 'libavcodec/cljrdec.c') diff --git a/libavcodec/cljrdec.c b/libavcodec/cljrdec.c new file mode 100644 index 0000000..e74d1fa --- /dev/null +++ b/libavcodec/cljrdec.c @@ -0,0 +1,95 @@ +/* + * Cirrus Logic AccuPak (CLJR) decoder + * Copyright (c) 2003 Alex Beregszaszi + * + * This file is part of Libav. + * + * Libav 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. + * + * Libav 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 Libav; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/** + * @file + * Cirrus Logic AccuPak decoder. + */ + +#include "avcodec.h" +#include "get_bits.h" +#include "internal.h" + +static int decode_frame(AVCodecContext *avctx, + void *data, int *got_frame, + AVPacket *avpkt) +{ + const uint8_t *buf = avpkt->data; + int buf_size = avpkt->size; + GetBitContext gb; + AVFrame * const p = data; + int x, y, ret; + + if (avctx->height <= 0 || avctx->width <= 0) { + av_log(avctx, AV_LOG_ERROR, "Invalid width or height\n"); + return AVERROR_INVALIDDATA; + } + + if (buf_size < avctx->height * avctx->width) { + av_log(avctx, AV_LOG_ERROR, + "Resolution larger than buffer size. Invalid header?\n"); + return AVERROR_INVALIDDATA; + } + + if ((ret = ff_get_buffer(avctx, p, 0)) < 0) { + av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); + return ret; + } + p->pict_type = AV_PICTURE_TYPE_I; + p->key_frame = 1; + + init_get_bits(&gb, buf, buf_size * 8); + + for (y = 0; y < avctx->height; y++) { + uint8_t *luma = &p->data[0][y * p->linesize[0]]; + uint8_t *cb = &p->data[1][y * p->linesize[1]]; + uint8_t *cr = &p->data[2][y * p->linesize[2]]; + for (x = 0; x < avctx->width; x += 4) { + luma[3] = get_bits(&gb, 5) << 3; + luma[2] = get_bits(&gb, 5) << 3; + luma[1] = get_bits(&gb, 5) << 3; + luma[0] = get_bits(&gb, 5) << 3; + luma += 4; + *(cb++) = get_bits(&gb, 6) << 2; + *(cr++) = get_bits(&gb, 6) << 2; + } + } + + *got_frame = 1; + + return buf_size; +} + +static av_cold int decode_init(AVCodecContext *avctx) +{ + avctx->pix_fmt = AV_PIX_FMT_YUV411P; + return 0; +} + +AVCodec ff_cljr_decoder = { + .name = "cljr", + .long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"), + .type = AVMEDIA_TYPE_VIDEO, + .id = AV_CODEC_ID_CLJR, + .init = decode_init, + .decode = decode_frame, + .capabilities = CODEC_CAP_DR1, +}; -- cgit v1.1