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/*
* Cirrus Logic AccuPak (CLJR) codec
* Copyright (c) 2003 Alex Beregszaszi
* |
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* This file is part of FFmpeg.
*
* 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
* 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
* 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 |
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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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/** |
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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 "internal.h" |
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#include "put_bits.h" |
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|
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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)
{
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;
}
#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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|
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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) {
av_log(avctx, AV_LOG_ERROR, "Invalid width or height\n");
return AVERROR_INVALIDDATA;
}
|
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if (buf_size / avctx->height < avctx->width) {
av_log(avctx, AV_LOG_ERROR,
"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;
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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p->pict_type = AV_PICTURE_TYPE_I;
p->key_frame = 1; |
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|
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init_get_bits(&gb, buf, buf_size * 8); |
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|
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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) { |
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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; |
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luma += 4; |
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*(cb++) = get_bits(&gb, 6) << 2;
*(cr++) = get_bits(&gb, 6) << 2; |
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}
}
|
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*picture = a->picture; |
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*data_size = sizeof(AVPicture);
return buf_size;
}
|
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static av_cold int decode_init(AVCodecContext *avctx)
{
avctx->pix_fmt = PIX_FMT_YUV411P;
return common_init(avctx); |
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}
|
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static av_cold int decode_end(AVCodecContext *avctx)
{
CLJRContext *a = avctx->priv_data; |
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|
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if (a->picture.data[0])
avctx->release_buffer(avctx, &a->picture); |
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return 0;
}
|
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AVCodec ff_cljr_decoder = { |
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.name = "cljr",
.type = AVMEDIA_TYPE_VIDEO,
.id = CODEC_ID_CLJR,
.priv_data_size = sizeof(CLJRContext),
.init = decode_init, |
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.close = decode_end, |
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.decode = decode_frame,
.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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|
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#if CONFIG_CLJR_ENCODER |
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static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
const AVFrame *p, int *got_packet) |
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{ |
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CLJRContext *a = avctx->priv_data; |
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PutBitContext pb; |
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int x, y, ret; |
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uint32_t dither= avctx->frame_number; |
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static const uint32_t ordered_dither[2][2] =
{
{ 0x10400000, 0x104F0000 },
{ 0xCB2A0000, 0xCB250000 },
}; |
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|
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if ((ret = ff_alloc_packet2(avctx, pkt, 32*avctx->height*avctx->width/4)) < 0) |
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return ret; |
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|
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avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
avctx->coded_frame->key_frame = 1; |
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|
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init_put_bits(&pb, pkt->data, pkt->size); |
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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) { |
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switch (a->dither_type) {
case 0: dither = 0x492A0000; break;
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);
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); |
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luma += 4; |
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put_bits(&pb, 6, (253*(*(cb++) + ((dither>>18)&3))) >> 10);
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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|
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pkt->size = put_bits_count(&pb) / 8;
pkt->flags |= AV_PKT_FLAG_KEY;
*got_packet = 1;
return 0; |
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}
|
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#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,
};
|
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AVCodec ff_cljr_encoder = { |
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.name = "cljr",
.type = AVMEDIA_TYPE_VIDEO,
.id = CODEC_ID_CLJR,
.priv_data_size = sizeof(CLJRContext), |
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.init = common_init, |
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.encode2 = encode_frame, |
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.pix_fmts = (const enum PixelFormat[]) { PIX_FMT_YUV411P,
PIX_FMT_NONE },
.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 |