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/* |
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* V.Flash PTX (.ptx) image decoder |
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* Copyright (c) 2007 Ivo van Poorten |
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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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#include "libavutil/common.h" |
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#include "libavutil/intreadwrite.h" |
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#include "libavutil/imgutils.h" |
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#include "avcodec.h" |
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#include "internal.h" |
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static int ptx_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, |
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AVPacket *avpkt) { |
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const uint8_t *buf = avpkt->data; |
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const uint8_t *buf_end = avpkt->data + avpkt->size; |
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AVFrame * const p = data; |
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unsigned int offset, w, h, y, stride, bytes_per_pixel; |
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int ret; |
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uint8_t *ptr; |
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if (buf_end - buf < 14) |
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return AVERROR_INVALIDDATA; |
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offset = AV_RL16(buf); |
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w = AV_RL16(buf+8); |
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h = AV_RL16(buf+10); |
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bytes_per_pixel = AV_RL16(buf+12) >> 3; |
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if (bytes_per_pixel != 2) { |
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avpriv_request_sample(avctx, "Image format not RGB15"); |
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return AVERROR_PATCHWELCOME; |
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} |
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avctx->pix_fmt = AV_PIX_FMT_BGR555LE; |
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if (buf_end - buf < offset) |
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return AVERROR_INVALIDDATA; |
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if (offset != 0x2c) |
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avpriv_request_sample(avctx, "offset != 0x2c"); |
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buf += offset; |
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if (buf_end - buf < w * bytes_per_pixel) |
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return AVERROR_INVALIDDATA; |
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if ((ret = ff_set_dimensions(avctx, w, h)) < 0) |
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return ret; |
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if ((ret = ff_get_buffer(avctx, p, 0)) < 0) |
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return ret; |
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p->pict_type = AV_PICTURE_TYPE_I; |
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ptr = p->data[0]; |
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stride = p->linesize[0]; |
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✓✓✓✗
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for (y = 0; y < h && buf_end - buf >= w * bytes_per_pixel; y++) { |
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memcpy(ptr, buf, w*bytes_per_pixel); |
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ptr += stride; |
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buf += w*bytes_per_pixel; |
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} |
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*got_frame = 1; |
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if (y < h) { |
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av_log(avctx, AV_LOG_WARNING, "incomplete packet\n"); |
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return avpkt->size; |
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} |
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return offset + w*h*bytes_per_pixel; |
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} |
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AVCodec ff_ptx_decoder = { |
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.name = "ptx", |
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.long_name = NULL_IF_CONFIG_SMALL("V.Flash PTX image"), |
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.type = AVMEDIA_TYPE_VIDEO, |
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.id = AV_CODEC_ID_PTX, |
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.decode = ptx_decode_frame, |
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.capabilities = AV_CODEC_CAP_DR1, |
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}; |