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/*
* 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
*/
/** |
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* @file |
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* Deluxe Paint Animation decoder
*/
#include "avcodec.h"
#include "bytestream.h" |
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#include "internal.h" |
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typedef struct AnmContext { |
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AVFrame *frame; |
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int palette[AVPALETTE_COUNT]; |
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GetByteContext gb; |
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int x; ///< x coordinate position
} AnmContext;
static av_cold int decode_init(AVCodecContext *avctx)
{
AnmContext *s = avctx->priv_data;
int i;
|
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avctx->pix_fmt = AV_PIX_FMT_PAL8; |
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|
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s->frame = av_frame_alloc();
if (!s->frame)
return AVERROR(ENOMEM);
|
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bytestream2_init(&s->gb, avctx->extradata, avctx->extradata_size); |
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if (bytestream2_get_bytes_left(&s->gb) < 16 * 8 + 4 * 256) {
av_frame_free(&s->frame); |
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return AVERROR_INVALIDDATA; |
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} |
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|
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bytestream2_skipu(&s->gb, 16 * 8); |
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for (i = 0; i < 256; i++) |
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s->palette[i] = bytestream2_get_le32u(&s->gb); |
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return 0;
}
/**
* Perform decode operation |
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* @param dst pointer to destination image buffer
* @param dst_end pointer to end of destination image buffer
* @param gb GetByteContext (optional, see below) |
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* @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
* |
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* a copy operation is achieved when 'gb' is set |
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* a fill operation is achieved when 'gb' is null and pixel is >= 0
* a skip operation is achieved when 'gb' is null and pixel is < 0 |
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*/
static inline int op(uint8_t **dst, const uint8_t *dst_end, |
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GetByteContext *gb, |
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int pixel, int count,
int *x, int width, int linesize)
{
int remaining = width - *x;
while(count > 0) {
int striplen = FFMIN(count, remaining); |
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if (gb) {
if (bytestream2_get_bytes_left(gb) < striplen) |
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goto exhausted; |
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bytestream2_get_bufferu(gb, *dst, striplen); |
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} 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, |
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void *data, int *got_frame, |
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AVPacket *avpkt)
{
AnmContext *s = avctx->priv_data;
const int buf_size = avpkt->size;
uint8_t *dst, *dst_end; |
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int count, ret; |
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|
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if ((ret = ff_reget_buffer(avctx, s->frame)) < 0) |
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return ret; |
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dst = s->frame->data[0];
dst_end = s->frame->data[0] + s->frame->linesize[0]*avctx->height; |
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|
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bytestream2_init(&s->gb, avpkt->data, buf_size);
if (bytestream2_get_byte(&s->gb) != 0x42) { |
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avpriv_request_sample(avctx, "Unknown record type"); |
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return AVERROR_INVALIDDATA; |
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} |
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if (bytestream2_get_byte(&s->gb)) { |
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avpriv_request_sample(avctx, "Padding bytes"); |
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return AVERROR_PATCHWELCOME; |
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} |
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bytestream2_skip(&s->gb, 2); |
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s->x = 0;
do {
/* if statements are ordered by probability */ |
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#define OP(gb, pixel, count) \ |
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op(&dst, dst_end, (gb), (pixel), (count), &s->x, avctx->width, s->frame->linesize[0]) |
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|
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int type = bytestream2_get_byte(&s->gb); |
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count = type & 0x7F;
type >>= 7;
if (count) { |
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if (OP(type ? NULL : &s->gb, -1, count)) break; |
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} else if (!type) {
int pixel; |
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count = bytestream2_get_byte(&s->gb); /* count==0 gives nop */
pixel = bytestream2_get_byte(&s->gb); |
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if (OP(NULL, pixel, count)) break;
} else {
int pixel; |
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type = bytestream2_get_le16(&s->gb); |
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count = type & 0x3FFF;
type >>= 14;
if (!count) {
if (type == 0)
break; // stop
if (type == 2) { |
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avpriv_request_sample(avctx, "Unknown opcode"); |
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return AVERROR_PATCHWELCOME; |
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}
continue;
} |
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pixel = type == 3 ? bytestream2_get_byte(&s->gb) : -1; |
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if (type == 1) count += 0x4000; |
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if (OP(type == 2 ? &s->gb : NULL, pixel, count)) break; |
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} |
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} while (bytestream2_get_bytes_left(&s->gb) > 0); |
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|
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memcpy(s->frame->data[1], s->palette, AVPALETTE_SIZE); |
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|
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*got_frame = 1; |
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if ((ret = av_frame_ref(data, s->frame)) < 0)
return ret;
|
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return buf_size;
}
static av_cold int decode_end(AVCodecContext *avctx)
{
AnmContext *s = avctx->priv_data; |
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av_frame_free(&s->frame); |
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return 0;
}
|
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AVCodec ff_anm_decoder = { |
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.name = "anm", |
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.long_name = NULL_IF_CONFIG_SMALL("Deluxe Paint Animation"), |
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.type = AVMEDIA_TYPE_VIDEO, |
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.id = AV_CODEC_ID_ANM, |
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.priv_data_size = sizeof(AnmContext),
.init = decode_init,
.close = decode_end,
.decode = decode_frame, |
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.capabilities = AV_CODEC_CAP_DR1, |
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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, |
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}; |