| /* |
| * QuickDraw (qdrw) codec |
| * Copyright (c) 2004 Konstantin Shishkov |
| * |
| * 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 |
| * Apple QuickDraw codec. |
| */ |
| |
| #include "libavutil/common.h" |
| #include "libavutil/intreadwrite.h" |
| #include "avcodec.h" |
| #include "internal.h" |
| |
| static int decode_frame(AVCodecContext *avctx, |
| void *data, int *got_frame, |
| AVPacket *avpkt) |
| { |
| const uint8_t *buf = avpkt->data; |
| const uint8_t *buf_end = avpkt->data + avpkt->size; |
| int buf_size = avpkt->size; |
| AVFrame * const p = data; |
| uint8_t* outdata; |
| int colors; |
| int i, ret; |
| uint32_t *pal; |
| int r, g, b; |
| |
| if ((ret = ff_get_buffer(avctx, p, 0)) < 0) |
| return ret; |
| p->pict_type = AV_PICTURE_TYPE_I; |
| p->key_frame = 1; |
| |
| outdata = p->data[0]; |
| |
| if (buf_end - buf < 0x68 + 4) |
| return AVERROR_INVALIDDATA; |
| buf += 0x68; /* jump to palette */ |
| colors = AV_RB32(buf); |
| buf += 4; |
| |
| if (colors < 0 || colors > 256) { |
| av_log(avctx, AV_LOG_ERROR, "Error color count - %i(0x%X)\n", colors, colors); |
| return AVERROR_INVALIDDATA; |
| } |
| if (buf_end - buf < (colors + 1) * 8) |
| return AVERROR_INVALIDDATA; |
| |
| pal = (uint32_t*)p->data[1]; |
| for (i = 0; i <= colors; i++) { |
| unsigned int idx; |
| idx = AV_RB16(buf); /* color index */ |
| buf += 2; |
| |
| if (idx > 255) { |
| av_log(avctx, AV_LOG_ERROR, "Palette index out of range: %u\n", idx); |
| buf += 6; |
| continue; |
| } |
| r = *buf++; |
| buf++; |
| g = *buf++; |
| buf++; |
| b = *buf++; |
| buf++; |
| pal[idx] = 0xFFU << 24 | r << 16 | g << 8 | b; |
| } |
| p->palette_has_changed = 1; |
| |
| if (buf_end - buf < 18) |
| return AVERROR_INVALIDDATA; |
| buf += 18; /* skip unneeded data */ |
| for (i = 0; i < avctx->height; i++) { |
| int size, left, code, pix; |
| const uint8_t *next; |
| uint8_t *out; |
| int tsize = 0; |
| |
| /* decode line */ |
| out = outdata; |
| size = AV_RB16(buf); /* size of packed line */ |
| buf += 2; |
| if (buf_end - buf < size) |
| return AVERROR_INVALIDDATA; |
| |
| left = size; |
| next = buf + size; |
| while (left > 0) { |
| code = *buf++; |
| if (code & 0x80 ) { /* run */ |
| pix = *buf++; |
| if ((out + (257 - code)) > (outdata + p->linesize[0])) |
| break; |
| memset(out, pix, 257 - code); |
| out += 257 - code; |
| tsize += 257 - code; |
| left -= 2; |
| } else { /* copy */ |
| if ((out + code) > (outdata + p->linesize[0])) |
| break; |
| if (buf_end - buf < code + 1) |
| return AVERROR_INVALIDDATA; |
| memcpy(out, buf, code + 1); |
| out += code + 1; |
| buf += code + 1; |
| left -= 2 + code; |
| tsize += code + 1; |
| } |
| } |
| buf = next; |
| outdata += p->linesize[0]; |
| } |
| |
| *got_frame = 1; |
| |
| return buf_size; |
| } |
| |
| static av_cold int decode_init(AVCodecContext *avctx) |
| { |
| avctx->pix_fmt= AV_PIX_FMT_PAL8; |
| |
| return 0; |
| } |
| |
| AVCodec ff_qdraw_decoder = { |
| .name = "qdraw", |
| .long_name = NULL_IF_CONFIG_SMALL("Apple QuickDraw"), |
| .type = AVMEDIA_TYPE_VIDEO, |
| .id = AV_CODEC_ID_QDRAW, |
| .init = decode_init, |
| .decode = decode_frame, |
| .capabilities = CODEC_CAP_DR1, |
| }; |