From 8992cb1d0d07edc33d274f6d7924ecdf6f83d994 Mon Sep 17 00:00:00 2001 From: Tim Redfern Date: Thu, 5 Sep 2013 17:57:22 +0100 Subject: making act segmenter --- ffmpeg/libavcodec/cljr.c | 190 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 190 insertions(+) create mode 100644 ffmpeg/libavcodec/cljr.c (limited to 'ffmpeg/libavcodec/cljr.c') diff --git a/ffmpeg/libavcodec/cljr.c b/ffmpeg/libavcodec/cljr.c new file mode 100644 index 0000000..2120864 --- /dev/null +++ b/ffmpeg/libavcodec/cljr.c @@ -0,0 +1,190 @@ +/* + * Cirrus Logic AccuPak (CLJR) codec + * Copyright (c) 2003 Alex Beregszaszi + * + * 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 + */ + +/** + * @file + * Cirrus Logic AccuPak codec. + */ + +#include "avcodec.h" +#include "libavutil/opt.h" +#include "get_bits.h" +#include "internal.h" +#include "put_bits.h" + +#if CONFIG_CLJR_DECODER +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) + 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)*33) >> 2; + luma[2] = (get_bits(&gb, 5)*33) >> 2; + luma[1] = (get_bits(&gb, 5)*33) >> 2; + luma[0] = (get_bits(&gb, 5)*33) >> 2; + 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", + .type = AVMEDIA_TYPE_VIDEO, + .id = AV_CODEC_ID_CLJR, + .init = decode_init, + .decode = decode_frame, + .capabilities = CODEC_CAP_DR1, + .long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"), +}; +#endif + +#if CONFIG_CLJR_ENCODER +typedef struct CLJRContext { + AVClass *avclass; + AVFrame picture; + int dither_type; +} CLJRContext; + +static av_cold int encode_init(AVCodecContext *avctx) +{ + CLJRContext * const a = avctx->priv_data; + + avctx->coded_frame = &a->picture; + + return 0; +} + +static int encode_frame(AVCodecContext *avctx, AVPacket *pkt, + const AVFrame *p, int *got_packet) +{ + CLJRContext *a = avctx->priv_data; + PutBitContext pb; + int x, y, ret; + uint32_t dither= avctx->frame_number; + static const uint32_t ordered_dither[2][2] = + { + { 0x10400000, 0x104F0000 }, + { 0xCB2A0000, 0xCB250000 }, + }; + + if ((ret = ff_alloc_packet2(avctx, pkt, 32*avctx->height*avctx->width/4)) < 0) + return ret; + + avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I; + avctx->coded_frame->key_frame = 1; + + init_put_bits(&pb, pkt->data, pkt->size); + + 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) { + switch (a->dither_type) { + case 0: dither = 0x492A0000; break; + case 1: dither = dither * 1664525 + 1013904223; break; + case 2: dither = ordered_dither[ y&1 ][ (x>>2)&1 ];break; + } + put_bits(&pb, 5, (249*(luma[3] + (dither>>29) )) >> 11); + put_bits(&pb, 5, (249*(luma[2] + ((dither>>26)&7))) >> 11); + put_bits(&pb, 5, (249*(luma[1] + ((dither>>23)&7))) >> 11); + put_bits(&pb, 5, (249*(luma[0] + ((dither>>20)&7))) >> 11); + luma += 4; + put_bits(&pb, 6, (253*(*(cb++) + ((dither>>18)&3))) >> 10); + put_bits(&pb, 6, (253*(*(cr++) + ((dither>>16)&3))) >> 10); + } + } + + flush_put_bits(&pb); + + pkt->size = put_bits_count(&pb) / 8; + pkt->flags |= AV_PKT_FLAG_KEY; + *got_packet = 1; + return 0; +} + +#define OFFSET(x) offsetof(CLJRContext, x) +#define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM +static const AVOption options[] = { + { "dither_type", "Dither type", OFFSET(dither_type), AV_OPT_TYPE_INT, { .i64=1 }, 0, 2, VE}, + { NULL }, +}; + +static const AVClass class = { + .class_name = "cljr encoder", + .item_name = av_default_item_name, + .option = options, + .version = LIBAVUTIL_VERSION_INT, +}; + +AVCodec ff_cljr_encoder = { + .name = "cljr", + .type = AVMEDIA_TYPE_VIDEO, + .id = AV_CODEC_ID_CLJR, + .priv_data_size = sizeof(CLJRContext), + .init = encode_init, + .encode2 = encode_frame, + .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV411P, + AV_PIX_FMT_NONE }, + .long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"), + .priv_class = &class, +}; +#endif -- cgit v1.2.3