/* * 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 * Deluxe Paint Animation decoder */ #include "avcodec.h"#include "bytestream.h"#include "codec_internal.h"#include "decode.h" typedef struct AnmContext {    AVFrame *frame;    int palette[AVPALETTE_COUNT];} AnmContext; static av_cold int decode_init(AVCodecContext *avctx){    AnmContext *s = avctx->priv_data;    GetByteContext gb;    int i;     if (avctx->extradata_size < 16 * 8 + 4 * 256)        return AVERROR_INVALIDDATA;     avctx->pix_fmt = AV_PIX_FMT_PAL8;     s->frame = av_frame_alloc();    if (!s->frame)        return AVERROR(ENOMEM);     bytestream2_init(&gb, avctx->extradata, avctx->extradata_size);    bytestream2_skipu(&gb, 16 * 8);    for (i = 0; i < 256; i++)        s->palette[i] = (0xFFU << 24) | bytestream2_get_le32u(&gb);     return 0;} /** * Perform decode operation * @param dst     pointer to destination image buffer * @param dst_end pointer to end of destination image buffer * @param gb GetByteContext (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 'gb' is set * 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 */static inline int op(uint8_t **dst, const uint8_t *dst_end,                     GetByteContext *gb,                     int pixel, int count,                     int *x, int width, int linesize){    int remaining = width - *x;    while(count > 0) {        int striplen = FFMIN(count, remaining);        if (gb) {            if (bytestream2_get_bytes_left(gb) < striplen)                goto exhausted;            bytestream2_get_bufferu(gb, *dst, 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, AVFrame *rframe,                        int *got_frame, AVPacket *avpkt){    AnmContext *s = avctx->priv_data;    const int buf_size = avpkt->size;    uint8_t *dst, *dst_end;    GetByteContext gb;    int count, ret, x = 0;     if (buf_size < 7)        return AVERROR_INVALIDDATA;     if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)        return ret;    dst     = s->frame->data[0];    dst_end = s->frame->data[0] + s->frame->linesize[0]*avctx->height;     bytestream2_init(&gb, avpkt->data, buf_size);     if (bytestream2_get_byte(&gb) != 0x42) {        avpriv_request_sample(avctx, "Unknown record type");        return AVERROR_INVALIDDATA;    }    if (bytestream2_get_byte(&gb)) {        avpriv_request_sample(avctx, "Padding bytes");        return AVERROR_PATCHWELCOME;    }    bytestream2_skip(&gb, 2);     do {        /* if statements are ordered by probability */#define OP(gb, pixel, count) \    op(&dst, dst_end, (gb), (pixel), (count), &x, avctx->width, s->frame->linesize[0])         int type = bytestream2_get_byte(&gb);        count = type & 0x7F;        type >>= 7;        if (count) {            if (OP(type ? NULL : &gb, -1, count)) break;        } else if (!type) {            int pixel;            count = bytestream2_get_byte(&gb);  /* count==0 gives nop */            pixel = bytestream2_get_byte(&gb);            if (OP(NULL, pixel, count)) break;        } else {            int pixel;            type = bytestream2_get_le16(&gb);            count = type & 0x3FFF;            type >>= 14;            if (!count) {                if (type == 0)                    break; // stop                if (type == 2) {                    avpriv_request_sample(avctx, "Unknown opcode");                    return AVERROR_PATCHWELCOME;                }                continue;            }            pixel = type == 3 ? bytestream2_get_byte(&gb) : -1;            if (type == 1) count += 0x4000;            if (OP(type == 2 ? &gb : NULL, pixel, count)) break;        }    } while (bytestream2_get_bytes_left(&gb) > 0);     memcpy(s->frame->data[1], s->palette, AVPALETTE_SIZE);     *got_frame = 1;    if ((ret = av_frame_ref(rframe, s->frame)) < 0)        return ret;     return buf_size;} static av_cold int decode_end(AVCodecContext *avctx){    AnmContext *s = avctx->priv_data;     av_frame_free(&s->frame);    return 0;} const FFCodec ff_anm_decoder = {    .p.name         = "anm",    CODEC_LONG_NAME("Deluxe Paint Animation"),    .p.type         = AVMEDIA_TYPE_VIDEO,    .p.id           = AV_CODEC_ID_ANM,    .priv_data_size = sizeof(AnmContext),    .init           = decode_init,    .close          = decode_end,    FF_CODEC_DECODE_CB(decode_frame),    .p.capabilities = AV_CODEC_CAP_DR1,};