mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-08-22 01:05:05 +02:00
199 lines
5.9 KiB
C
199 lines
5.9 KiB
C
/*
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* Deluxe Paint Animation decoder
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* Copyright (c) 2009 Peter Ross
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* 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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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; 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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* @file
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* Deluxe Paint Animation decoder
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*/
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#include "avcodec.h"
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#include "bytestream.h"
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typedef struct AnmContext {
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AVFrame frame;
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int x; ///< x coordinate position
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} AnmContext;
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static av_cold int decode_init(AVCodecContext *avctx)
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{
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AnmContext *s = avctx->priv_data;
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const uint8_t *buf;
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int i;
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avctx->pix_fmt = PIX_FMT_PAL8;
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if (avctx->extradata_size != 16*8 + 4*256)
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return -1;
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s->frame.reference = 1;
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if (avctx->get_buffer(avctx, &s->frame) < 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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}
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buf = avctx->extradata + 16*8;
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for (i = 0; i < 256; i++)
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((uint32_t*)s->frame.data[1])[i] = bytestream_get_le32(&buf);
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return 0;
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}
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/**
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* Perform decode operation
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* @param dst, dst_end Destination image buffer
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* @param buf, buf_end Source buffer (optional, see below)
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* @param pixel Fill color (optional, see below)
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* @param count Pixel count
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* @param x Pointer to x-axis counter
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* @param width Image width
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* @param linesize Destination image buffer linesize
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* @return non-zero if destination buffer is exhausted
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*
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* a copy operation is achieved when 'buf' is set
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* a fill operation is acheived when 'buf' is null and pixel is >= 0
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* a skip operation is acheived when 'buf' is null and pixel is < 0
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*/
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static inline int op(uint8_t **dst, const uint8_t *dst_end,
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const uint8_t **buf, const uint8_t *buf_end,
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int pixel, int count,
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int *x, int width, int linesize)
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{
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int remaining = width - *x;
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while(count > 0) {
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int striplen = FFMIN(count, remaining);
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if (buf) {
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striplen = FFMIN(striplen, buf_end - *buf);
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if (*buf >= buf_end)
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goto exhausted;
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memcpy(*dst, *buf, striplen);
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*buf += striplen;
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} else if (pixel >= 0)
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memset(*dst, pixel, striplen);
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*dst += striplen;
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remaining -= striplen;
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count -= striplen;
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if (remaining <= 0) {
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*dst += linesize - width;
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remaining = width;
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}
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if (linesize > 0) {
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if (*dst >= dst_end) goto exhausted;
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} else {
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if (*dst <= dst_end) goto exhausted;
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}
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}
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*x = width - remaining;
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return 0;
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exhausted:
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*x = width - remaining;
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return 1;
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}
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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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AnmContext *s = avctx->priv_data;
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const uint8_t *buf = avpkt->data;
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const int buf_size = avpkt->size;
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const uint8_t *buf_end = buf + buf_size;
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uint8_t *dst, *dst_end;
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int count;
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if(avctx->reget_buffer(avctx, &s->frame) < 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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}
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dst = s->frame.data[0];
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dst_end = s->frame.data[0] + s->frame.linesize[0]*avctx->height;
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if (buf[0] != 0x42) {
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av_log_ask_for_sample(avctx, "unknown record type\n");
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return buf_size;
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}
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if (buf[1]) {
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av_log_ask_for_sample(avctx, "padding bytes not supported\n");
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return buf_size;
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}
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buf += 4;
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s->x = 0;
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do {
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/* if statements are ordered by probability */
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#define OP(buf, pixel, count) \
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op(&dst, dst_end, (buf), buf_end, (pixel), (count), &s->x, avctx->width, s->frame.linesize[0])
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int type = bytestream_get_byte(&buf);
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count = type & 0x7F;
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type >>= 7;
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if (count) {
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if (OP(type ? NULL : &buf, -1, count)) break;
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} else if (!type) {
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int pixel;
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count = bytestream_get_byte(&buf); /* count==0 gives nop */
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pixel = bytestream_get_byte(&buf);
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if (OP(NULL, pixel, count)) break;
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} else {
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int pixel;
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type = bytestream_get_le16(&buf);
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count = type & 0x3FFF;
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type >>= 14;
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if (!count) {
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if (type == 0)
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break; // stop
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if (type == 2) {
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av_log_ask_for_sample(avctx, "unknown opcode");
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return AVERROR_INVALIDDATA;
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}
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continue;
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}
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pixel = type == 3 ? bytestream_get_byte(&buf) : -1;
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if (type == 1) count += 0x4000;
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if (OP(type == 2 ? &buf : NULL, pixel, count)) break;
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}
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} while (buf + 1 < buf_end);
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*data_size = sizeof(AVFrame);
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*(AVFrame*)data = s->frame;
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return buf_size;
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}
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static av_cold int decode_end(AVCodecContext *avctx)
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{
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AnmContext *s = avctx->priv_data;
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if (s->frame.data[0])
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avctx->release_buffer(avctx, &s->frame);
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return 0;
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}
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AVCodec ff_anm_decoder = {
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.name = "anm",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = CODEC_ID_ANM,
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.priv_data_size = sizeof(AnmContext),
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.init = decode_init,
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.close = decode_end,
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.decode = decode_frame,
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.capabilities = CODEC_CAP_DR1,
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.long_name = NULL_IF_CONFIG_SMALL("Deluxe Paint Animation"),
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};
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