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ffmpeg / libavcodec / anm.c @ 62931e11

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/*
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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 FFmpeg.
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 *
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 * 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
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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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 * 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
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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 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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/**
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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 palette[AVPALETTE_COUNT];
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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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    buf = avctx->extradata + 16*8;
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    for (i = 0; i < 256; i++)
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        s->palette[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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            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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    memcpy(s->frame.data[1], s->palette, AVPALETTE_SIZE);
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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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    "anm",
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    AVMEDIA_TYPE_VIDEO,
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    CODEC_ID_ANM,
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    sizeof(AnmContext),
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    decode_init,
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    NULL,
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    decode_end,
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    decode_frame,
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    CODEC_CAP_DR1,
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    .long_name = NULL_IF_CONFIG_SMALL("Deluxe Paint Animation"),
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};