mirror of https://github.com/FFmpeg/FFmpeg.git
Originally committed as revision 21117 to svn://svn.ffmpeg.org/ffmpeg/trunkrelease/0.6
Peter Ross
15 years ago
parent
add5badbc1
commit
a1ae40fd0d
5 changed files with 202 additions and 1 deletions
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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 libavcodec/anm.c |
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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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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 anm_decoder = { |
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"anm", |
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CODEC_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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}; |
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