mirror of
https://github.com/FFmpeg/FFmpeg.git
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7e5cbb3c2d
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
206 lines
6.2 KiB
C
206 lines
6.2 KiB
C
/*
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* Cirrus Logic AccuPak (CLJR) codec
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* Copyright (c) 2003 Alex Beregszaszi
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* Cirrus Logic AccuPak codec.
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*/
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#include "avcodec.h"
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#include "libavutil/opt.h"
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#include "get_bits.h"
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#include "put_bits.h"
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typedef struct CLJRContext {
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AVClass *avclass;
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AVFrame picture;
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int dither_type;
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} CLJRContext;
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static av_cold int common_init(AVCodecContext *avctx)
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{
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CLJRContext * const a = avctx->priv_data;
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avcodec_get_frame_defaults(&a->picture);
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avctx->coded_frame = &a->picture;
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return 0;
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}
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#if CONFIG_CLJR_DECODER
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static int decode_frame(AVCodecContext *avctx,
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void *data, int *data_size,
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AVPacket *avpkt)
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{
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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CLJRContext * const a = avctx->priv_data;
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GetBitContext gb;
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AVFrame *picture = data;
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AVFrame * const p = &a->picture;
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int x, y;
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if (p->data[0])
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avctx->release_buffer(avctx, p);
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if (avctx->height <= 0 || avctx->width <= 0) {
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av_log(avctx, AV_LOG_ERROR, "Invalid width or height\n");
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return AVERROR_INVALIDDATA;
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}
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if (buf_size / avctx->height < avctx->width) {
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av_log(avctx, AV_LOG_ERROR,
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"Resolution larger than buffer size. Invalid header?\n");
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return AVERROR_INVALIDDATA;
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}
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p->reference = 0;
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if (avctx->get_buffer(avctx, p) < 0) {
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av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
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return -1;
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}
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p->pict_type = AV_PICTURE_TYPE_I;
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p->key_frame = 1;
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init_get_bits(&gb, buf, buf_size * 8);
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for (y = 0; y < avctx->height; y++) {
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uint8_t *luma = &a->picture.data[0][y * a->picture.linesize[0]];
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uint8_t *cb = &a->picture.data[1][y * a->picture.linesize[1]];
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uint8_t *cr = &a->picture.data[2][y * a->picture.linesize[2]];
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for (x = 0; x < avctx->width; x += 4) {
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luma[3] = (get_bits(&gb, 5)*33) >> 2;
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luma[2] = (get_bits(&gb, 5)*33) >> 2;
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luma[1] = (get_bits(&gb, 5)*33) >> 2;
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luma[0] = (get_bits(&gb, 5)*33) >> 2;
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luma += 4;
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*(cb++) = get_bits(&gb, 6) << 2;
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*(cr++) = get_bits(&gb, 6) << 2;
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}
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}
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*picture = a->picture;
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*data_size = sizeof(AVPicture);
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return buf_size;
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}
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static av_cold int decode_init(AVCodecContext *avctx)
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{
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avctx->pix_fmt = PIX_FMT_YUV411P;
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return common_init(avctx);
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}
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static av_cold int decode_end(AVCodecContext *avctx)
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{
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CLJRContext *a = avctx->priv_data;
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if (a->picture.data[0])
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avctx->release_buffer(avctx, &a->picture);
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return 0;
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}
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AVCodec ff_cljr_decoder = {
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.name = "cljr",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = CODEC_ID_CLJR,
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.priv_data_size = sizeof(CLJRContext),
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.init = decode_init,
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.close = decode_end,
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.decode = decode_frame,
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.capabilities = CODEC_CAP_DR1,
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.long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
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};
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#endif
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#if CONFIG_CLJR_ENCODER
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static int encode_frame(AVCodecContext *avctx, unsigned char *buf,
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int buf_size, void *data)
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{
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CLJRContext *a = avctx->priv_data;
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PutBitContext pb;
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AVFrame *p = data;
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int x, y;
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uint32_t dither= avctx->frame_number;
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static const uint32_t ordered_dither[2][2] =
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{
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{ 0x10400000, 0x104F0000 },
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{ 0xCB2A0000, 0xCB250000 },
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};
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p->pict_type = AV_PICTURE_TYPE_I;
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p->key_frame = 1;
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init_put_bits(&pb, buf, buf_size / 8);
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for (y = 0; y < avctx->height; y++) {
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uint8_t *luma = &p->data[0][y * p->linesize[0]];
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uint8_t *cb = &p->data[1][y * p->linesize[1]];
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uint8_t *cr = &p->data[2][y * p->linesize[2]];
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for (x = 0; x < avctx->width; x += 4) {
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switch (a->dither_type) {
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case 0: dither = 0x492A0000; break;
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case 1: dither = dither * 1664525 + 1013904223; break;
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case 2: dither = ordered_dither[ y&1 ][ (x>>2)&1 ];break;
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}
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put_bits(&pb, 5, (249*(luma[3] + (dither>>29) )) >> 11);
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put_bits(&pb, 5, (249*(luma[2] + ((dither>>26)&7))) >> 11);
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put_bits(&pb, 5, (249*(luma[1] + ((dither>>23)&7))) >> 11);
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put_bits(&pb, 5, (249*(luma[0] + ((dither>>20)&7))) >> 11);
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luma += 4;
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put_bits(&pb, 6, (253*(*(cb++) + ((dither>>18)&3))) >> 10);
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put_bits(&pb, 6, (253*(*(cr++) + ((dither>>16)&3))) >> 10);
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}
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}
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flush_put_bits(&pb);
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return put_bits_count(&pb) / 8;
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}
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#define OFFSET(x) offsetof(CLJRContext, x)
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#define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
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static const AVOption options[] = {
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{ "dither_type", "Dither type", OFFSET(dither_type), AV_OPT_TYPE_INT, { .dbl=1 }, 0, 2, VE},
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{ NULL },
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};
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static const AVClass class = {
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.class_name = "cljr encoder",
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.item_name = av_default_item_name,
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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AVCodec ff_cljr_encoder = {
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.name = "cljr",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = CODEC_ID_CLJR,
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.priv_data_size = sizeof(CLJRContext),
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.init = common_init,
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.encode = encode_frame,
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.pix_fmts = (const enum PixelFormat[]) { PIX_FMT_YUV411P,
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PIX_FMT_NONE },
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.long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
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.priv_class = &class,
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};
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#endif
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