File size: 4,625 Bytes
8ead80b |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 |
/*
* Autodesk RLE Decoder
* Copyright (C) 2005 The FFmpeg project
*
* 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
* Autodesk RLE Video Decoder by Konstantin Shishkov
*/
#include <string.h>
#include "avcodec.h"
#include "codec_internal.h"
#include "decode.h"
#include "msrledec.h"
typedef struct AascContext {
AVCodecContext *avctx;
GetByteContext gb;
AVFrame *frame;
uint32_t palette[AVPALETTE_COUNT];
int palette_size;
} AascContext;
static av_cold int aasc_decode_init(AVCodecContext *avctx)
{
AascContext *s = avctx->priv_data;
uint8_t *ptr;
int i;
s->avctx = avctx;
switch (avctx->bits_per_coded_sample) {
case 8:
avctx->pix_fmt = AV_PIX_FMT_PAL8;
ptr = avctx->extradata;
s->palette_size = FFMIN(avctx->extradata_size, AVPALETTE_SIZE);
for (i = 0; i < s->palette_size / 4; i++) {
s->palette[i] = 0xFFU << 24 | AV_RL32(ptr);
ptr += 4;
}
break;
case 16:
avctx->pix_fmt = AV_PIX_FMT_RGB555LE;
break;
case 24:
avctx->pix_fmt = AV_PIX_FMT_BGR24;
break;
default:
av_log(avctx, AV_LOG_ERROR, "Unsupported bit depth: %d\n", avctx->bits_per_coded_sample);
return -1;
}
s->frame = av_frame_alloc();
if (!s->frame)
return AVERROR(ENOMEM);
return 0;
}
static int aasc_decode_frame(AVCodecContext *avctx, AVFrame *rframe,
int *got_frame, AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
AascContext *s = avctx->priv_data;
int compr, i, stride, psize, ret;
if (buf_size < 4) {
av_log(avctx, AV_LOG_ERROR, "frame too short\n");
return AVERROR_INVALIDDATA;
}
if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
return ret;
compr = AV_RL32(buf);
buf += 4;
buf_size -= 4;
psize = avctx->bits_per_coded_sample / 8;
switch (avctx->codec_tag) {
case MKTAG('A', 'A', 'S', '4'):
bytestream2_init(&s->gb, buf - 4, buf_size + 4);
ff_msrle_decode(avctx, s->frame, 8, &s->gb);
break;
case MKTAG('A', 'A', 'S', 'C'):
switch (compr) {
case 0:
stride = (avctx->width * psize + psize) & ~psize;
if (buf_size < stride * avctx->height)
return AVERROR_INVALIDDATA;
for (i = avctx->height - 1; i >= 0; i--) {
memcpy(s->frame->data[0] + i * s->frame->linesize[0], buf, avctx->width * psize);
buf += stride;
buf_size -= stride;
}
break;
case 1:
bytestream2_init(&s->gb, buf, buf_size);
ff_msrle_decode(avctx, s->frame, 8, &s->gb);
break;
default:
av_log(avctx, AV_LOG_ERROR, "Unknown compression type %d\n", compr);
return AVERROR_INVALIDDATA;
}
break;
default:
av_log(avctx, AV_LOG_ERROR, "Unknown FourCC: %X\n", avctx->codec_tag);
return -1;
}
if (avctx->pix_fmt == AV_PIX_FMT_PAL8)
memcpy(s->frame->data[1], s->palette, s->palette_size);
*got_frame = 1;
if ((ret = av_frame_ref(rframe, s->frame)) < 0)
return ret;
/* report that the buffer was completely consumed */
return avpkt->size;
}
static av_cold int aasc_decode_end(AVCodecContext *avctx)
{
AascContext *s = avctx->priv_data;
av_frame_free(&s->frame);
return 0;
}
const FFCodec ff_aasc_decoder = {
.p.name = "aasc",
CODEC_LONG_NAME("Autodesk RLE"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_AASC,
.priv_data_size = sizeof(AascContext),
.init = aasc_decode_init,
.close = aasc_decode_end,
FF_CODEC_DECODE_CB(aasc_decode_frame),
.p.capabilities = AV_CODEC_CAP_DR1,
};
|