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/*
* Quicktime Planar RGB (8BPS) Video Decoder
* Copyright (C) 2003 Roberto Togni
* |
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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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* @file |
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* QT 8BPS Video Decoder by Roberto Togni |
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* For more information about the 8BPS format, visit:
* http://www.pcisys.net/~melanson/codecs/
*
* Supports: PAL8 (RGB 8bpp, paletted) |
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* : BGR24 (RGB 24bpp) (can also output it as RGB32) |
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* : RGB32 (RGB 32bpp, 4th plane is alpha) |
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*
*/
#include <stdio.h>
#include <stdlib.h> |
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#include <string.h> |
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|
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#include "libavutil/internal.h" |
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#include "libavutil/intreadwrite.h" |
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#include "avcodec.h" |
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#include "internal.h" |
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|
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static const enum AVPixelFormat pixfmt_rgb24[] = {
AV_PIX_FMT_BGR24, AV_PIX_FMT_RGB32, AV_PIX_FMT_NONE }; |
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typedef struct EightBpsContext { |
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AVCodecContext *avctx; |
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|
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unsigned char planes;
unsigned char planemap[4]; |
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|
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uint32_t pal[256]; |
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} EightBpsContext;
|
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static int decode_frame(AVCodecContext *avctx, void *data, |
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int *got_frame, AVPacket *avpkt) |
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{ |
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AVFrame *frame = data; |
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const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
EightBpsContext * const c = avctx->priv_data;
const unsigned char *encoded = buf;
unsigned char *pixptr, *pixptr_end;
unsigned int height = avctx->height; // Real image height
unsigned int dlen, p, row; |
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const unsigned char *lp, *dp, *ep; |
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unsigned char count;
unsigned int planes = c->planes;
unsigned char *planemap = c->planemap; |
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int ret; |
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|
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if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
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return ret; |
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|
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ep = encoded + buf_size;
|
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/* Set data pointer after line lengths */
dp = encoded + planes * (height << 1);
for (p = 0; p < planes; p++) {
/* Lines length pointer for this plane */
lp = encoded + p * (height << 1);
/* Decode a plane */
for (row = 0; row < height; row++) { |
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pixptr = frame->data[0] + row * frame->linesize[0] + planemap[p];
pixptr_end = pixptr + frame->linesize[0]; |
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if (ep - lp < row * 2 + 2)
return AVERROR_INVALIDDATA; |
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dlen = av_be2ne16(*(const unsigned short *)(lp + row * 2));
/* Decode a row of this plane */
while (dlen > 0) { |
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if (ep - dp <= 1) |
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return AVERROR_INVALIDDATA; |
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if ((count = *dp++) <= 127) {
count++;
dlen -= count + 1; |
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if (pixptr_end - pixptr < count * planes) |
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break; |
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if (ep - dp < count) |
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return AVERROR_INVALIDDATA; |
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while (count--) {
*pixptr = *dp++; |
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pixptr += planes; |
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}
} else {
count = 257 - count; |
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if (pixptr_end - pixptr < count * planes) |
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break;
while (count--) {
*pixptr = *dp; |
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pixptr += planes; |
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}
dp++;
dlen -= 2; |
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} |
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} |
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} |
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}
|
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if (avctx->bits_per_coded_sample <= 8) { |
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const uint8_t *pal = av_packet_get_side_data(avpkt,
AV_PKT_DATA_PALETTE,
NULL);
if (pal) { |
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frame->palette_has_changed = 1; |
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memcpy(c->pal, pal, AVPALETTE_SIZE); |
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}
|
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memcpy (frame->data[1], c->pal, AVPALETTE_SIZE); |
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}
|
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*got_frame = 1; |
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|
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/* always report that the buffer was completely consumed */
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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EightBpsContext * const c = avctx->priv_data;
c->avctx = avctx;
switch (avctx->bits_per_coded_sample) {
case 8: |
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avctx->pix_fmt = AV_PIX_FMT_PAL8; |
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c->planes = 1;
c->planemap[0] = 0; // 1st plane is palette indexes
break;
case 24:
avctx->pix_fmt = avctx->get_format(avctx, pixfmt_rgb24);
c->planes = 3;
c->planemap[0] = 2; // 1st plane is red
c->planemap[1] = 1; // 2nd plane is green
c->planemap[2] = 0; // 3rd plane is blue
break;
case 32: |
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avctx->pix_fmt = AV_PIX_FMT_RGB32; |
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c->planes = 4; |
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/* handle planemap setup later for decoding rgb24 data as rbg32 */ |
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break;
default:
av_log(avctx, AV_LOG_ERROR, "Error: Unsupported color depth: %u.\n",
avctx->bits_per_coded_sample); |
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return AVERROR_INVALIDDATA; |
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}
|
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if (avctx->pix_fmt == AV_PIX_FMT_RGB32) {
c->planemap[0] = HAVE_BIGENDIAN ? 1 : 2; // 1st plane is red
c->planemap[1] = HAVE_BIGENDIAN ? 2 : 1; // 2nd plane is green
c->planemap[2] = HAVE_BIGENDIAN ? 3 : 0; // 3rd plane is blue |
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c->planemap[3] = HAVE_BIGENDIAN ? 0 : 3; // 4th plane is alpha |
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} |
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return 0; |
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}
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AVCodec ff_eightbps_decoder = { |
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.name = "8bps", |
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.long_name = NULL_IF_CONFIG_SMALL("QuickTime 8BPS video"), |
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.type = AVMEDIA_TYPE_VIDEO, |
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.id = AV_CODEC_ID_8BPS, |
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.priv_data_size = sizeof(EightBpsContext),
.init = decode_init,
.decode = decode_frame,
.capabilities = CODEC_CAP_DR1, |
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}; |