| /* |
| * 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" |
| |
| typedef struct CLJRContext { |
| AVClass *avclass; |
| AVFrame picture; |
| int dither_type; |
| } CLJRContext; |
| |
| static av_cold int common_init(AVCodecContext *avctx) |
| { |
| CLJRContext * const a = avctx->priv_data; |
| |
| avcodec_get_frame_defaults(&a->picture); |
| avctx->coded_frame = &a->picture; |
| |
| return 0; |
| } |
| |
| #if CONFIG_CLJR_DECODER |
| static int decode_frame(AVCodecContext *avctx, |
| void *data, int *data_size, |
| AVPacket *avpkt) |
| { |
| const uint8_t *buf = avpkt->data; |
| int buf_size = avpkt->size; |
| CLJRContext * const a = avctx->priv_data; |
| GetBitContext gb; |
| AVFrame *picture = data; |
| AVFrame * const p = &a->picture; |
| int x, y; |
| |
| if (p->data[0]) |
| avctx->release_buffer(avctx, p); |
| |
| 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; |
| } |
| |
| p->reference = 0; |
| if (avctx->get_buffer(avctx, p) < 0) { |
| av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); |
| return -1; |
| } |
| 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 = &a->picture.data[0][y * a->picture.linesize[0]]; |
| uint8_t *cb = &a->picture.data[1][y * a->picture.linesize[1]]; |
| uint8_t *cr = &a->picture.data[2][y * a->picture.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; |
| } |
| } |
| |
| *picture = a->picture; |
| *data_size = sizeof(AVPicture); |
| |
| return buf_size; |
| } |
| |
| static av_cold int decode_init(AVCodecContext *avctx) |
| { |
| avctx->pix_fmt = PIX_FMT_YUV411P; |
| return common_init(avctx); |
| } |
| |
| static av_cold int decode_end(AVCodecContext *avctx) |
| { |
| CLJRContext *a = avctx->priv_data; |
| |
| if (a->picture.data[0]) |
| avctx->release_buffer(avctx, &a->picture); |
| return 0; |
| } |
| |
| AVCodec ff_cljr_decoder = { |
| .name = "cljr", |
| .type = AVMEDIA_TYPE_VIDEO, |
| .id = CODEC_ID_CLJR, |
| .priv_data_size = sizeof(CLJRContext), |
| .init = decode_init, |
| .close = decode_end, |
| .decode = decode_frame, |
| .capabilities = CODEC_CAP_DR1, |
| .long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"), |
| }; |
| #endif |
| |
| #if CONFIG_CLJR_ENCODER |
| 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, { .dbl=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 = CODEC_ID_CLJR, |
| .priv_data_size = sizeof(CLJRContext), |
| .init = common_init, |
| .encode2 = encode_frame, |
| .pix_fmts = (const enum PixelFormat[]) { PIX_FMT_YUV411P, |
| PIX_FMT_NONE }, |
| .long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"), |
| .priv_class = &class, |
| }; |
| #endif |