FFmpeg/libavcodec/anm.c
Stefano Sabatini 72415b2adb Define AVMediaType enum, and use it instead of enum CodecType, which
is deprecated and will be dropped at the next major bump.

Originally committed as revision 22735 to svn://svn.ffmpeg.org/ffmpeg/trunk
2010-03-30 23:30:55 +00:00

198 lines
5.7 KiB
C

/*
* Deluxe Paint Animation decoder
* Copyright (c) 2009 Peter Ross
*
* 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 libavcodec/anm.c
* Deluxe Paint Animation decoder
*/
#include "avcodec.h"
#include "bytestream.h"
typedef struct AnmContext {
AVFrame frame;
int x; ///< x coordinate position
} AnmContext;
static av_cold int decode_init(AVCodecContext *avctx)
{
AnmContext *s = avctx->priv_data;
const uint8_t *buf;
int i;
avctx->pix_fmt = PIX_FMT_PAL8;
if (avctx->extradata_size != 16*8 + 4*256)
return -1;
s->frame.reference = 1;
if (avctx->get_buffer(avctx, &s->frame) < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return -1;
}
buf = avctx->extradata + 16*8;
for (i = 0; i < 256; i++)
((uint32_t*)s->frame.data[1])[i] = bytestream_get_le32(&buf);
return 0;
}
/**
* Perform decode operation
* @param dst, dst_end Destination image buffer
* @param buf, buf_end Source buffer (optional, see below)
* @param pixel Fill color (optional, see below)
* @param count Pixel count
* @param x Pointer to x-axis counter
* @param width Image width
* @param linesize Destination image buffer linesize
* @return non-zero if destination buffer is exhausted
*
* a copy operation is achieved when 'buf' is set
* a fill operation is acheived when 'buf' is null and pixel is >= 0
* a skip operation is acheived when 'buf' is null and pixel is < 0
*/
static inline int op(uint8_t **dst, const uint8_t *dst_end,
const uint8_t **buf, const uint8_t *buf_end,
int pixel, int count,
int *x, int width, int linesize)
{
int remaining = width - *x;
while(count > 0) {
int striplen = FFMIN(count, remaining);
if (buf) {
striplen = FFMIN(striplen, buf_end - *buf);
memcpy(*dst, *buf, striplen);
*buf += striplen;
} else if (pixel >= 0)
memset(*dst, pixel, striplen);
*dst += striplen;
remaining -= striplen;
count -= striplen;
if (remaining <= 0) {
*dst += linesize - width;
remaining = width;
}
if (linesize > 0) {
if (*dst >= dst_end) goto exhausted;
} else {
if (*dst <= dst_end) goto exhausted;
}
}
*x = width - remaining;
return 0;
exhausted:
*x = width - remaining;
return 1;
}
static int decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
AVPacket *avpkt)
{
AnmContext *s = avctx->priv_data;
const uint8_t *buf = avpkt->data;
const int buf_size = avpkt->size;
const uint8_t *buf_end = buf + buf_size;
uint8_t *dst, *dst_end;
int count;
if(avctx->reget_buffer(avctx, &s->frame) < 0){
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return -1;
}
dst = s->frame.data[0];
dst_end = s->frame.data[0] + s->frame.linesize[0]*avctx->height;
if (buf[0] != 0x42) {
av_log_ask_for_sample(avctx, "unknown record type\n");
return buf_size;
}
if (buf[1]) {
av_log_ask_for_sample(avctx, "padding bytes not supported\n");
return buf_size;
}
buf += 4;
s->x = 0;
do {
/* if statements are ordered by probability */
#define OP(buf, pixel, count) \
op(&dst, dst_end, (buf), buf_end, (pixel), (count), &s->x, avctx->width, s->frame.linesize[0])
int type = bytestream_get_byte(&buf);
count = type & 0x7F;
type >>= 7;
if (count) {
if (OP(type ? NULL : &buf, -1, count)) break;
} else if (!type) {
int pixel;
count = bytestream_get_byte(&buf); /* count==0 gives nop */
pixel = bytestream_get_byte(&buf);
if (OP(NULL, pixel, count)) break;
} else {
int pixel;
type = bytestream_get_le16(&buf);
count = type & 0x3FFF;
type >>= 14;
if (!count) {
if (type == 0)
break; // stop
if (type == 2) {
av_log_ask_for_sample(avctx, "unknown opcode");
return AVERROR_INVALIDDATA;
}
continue;
}
pixel = type == 3 ? bytestream_get_byte(&buf) : -1;
if (type == 1) count += 0x4000;
if (OP(type == 2 ? &buf : NULL, pixel, count)) break;
}
} while (buf + 1 < buf_end);
*data_size = sizeof(AVFrame);
*(AVFrame*)data = s->frame;
return buf_size;
}
static av_cold int decode_end(AVCodecContext *avctx)
{
AnmContext *s = avctx->priv_data;
if (s->frame.data[0])
avctx->release_buffer(avctx, &s->frame);
return 0;
}
AVCodec anm_decoder = {
"anm",
AVMEDIA_TYPE_VIDEO,
CODEC_ID_ANM,
sizeof(AnmContext),
decode_init,
NULL,
decode_end,
decode_frame,
CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("Deluxe Paint Animation"),
};