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/* |
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* Alias PIX image decoder |
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* Copyright (C) 2014 Vittorio Giovara <vittorio.giovara@gmail.com> |
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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/intreadwrite.h" |
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#include "avcodec.h" |
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#include "bytestream.h" |
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#include "internal.h" |
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#define ALIAS_HEADER_SIZE 10 |
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static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, |
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AVPacket *avpkt) |
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{ |
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AVFrame *f = data; |
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GetByteContext gb; |
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int width, height, ret, bits_pixel, pixel; |
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uint8_t *out_buf; |
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uint8_t count; |
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int x, y; |
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bytestream2_init(&gb, avpkt->data, avpkt->size); |
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✗✓ |
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if (bytestream2_get_bytes_left(&gb) < ALIAS_HEADER_SIZE) { |
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av_log(avctx, AV_LOG_ERROR, "Header too small %d.\n", avpkt->size); |
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return AVERROR_INVALIDDATA; |
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} |
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width = bytestream2_get_be16u(&gb); |
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height = bytestream2_get_be16u(&gb); |
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bytestream2_skipu(&gb, 4); // obsolete X, Y offset |
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bits_pixel = bytestream2_get_be16u(&gb); |
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✓✓ |
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if (bits_pixel == 24) |
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avctx->pix_fmt = AV_PIX_FMT_BGR24; |
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✓✗ |
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else if (bits_pixel == 8) |
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avctx->pix_fmt = AV_PIX_FMT_GRAY8; |
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else { |
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av_log(avctx, AV_LOG_ERROR, "Invalid pixel format.\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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ret = ff_set_dimensions(avctx, width, height); |
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✗✓ |
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if (ret < 0) |
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return ret; |
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✗✓ |
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if (bytestream2_get_bytes_left(&gb) < width*height / 255) |
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return AVERROR_INVALIDDATA; |
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ret = ff_get_buffer(avctx, f, 0); |
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✗✓ |
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if (ret < 0) |
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return ret; |
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f->pict_type = AV_PICTURE_TYPE_I; |
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f->key_frame = 1; |
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x = 0; |
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y = 1; |
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out_buf = f->data[0]; |
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✓✓ |
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while (bytestream2_get_bytes_left(&gb) > 0) { |
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int i; |
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/* set buffer at the right position at every new line */ |
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✓✓ |
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if (x == avctx->width) { |
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x = 0; |
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out_buf = f->data[0] + f->linesize[0] * y++; |
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✗✓ |
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if (y > avctx->height) { |
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av_log(avctx, AV_LOG_ERROR, |
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"Ended frame decoding with %d bytes left.\n", |
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bytestream2_get_bytes_left(&gb)); |
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return AVERROR_INVALIDDATA; |
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} |
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} |
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/* read packet and copy data */ |
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count = bytestream2_get_byteu(&gb); |
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✓✗✗✓
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if (!count || x + count > avctx->width) { |
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av_log(avctx, AV_LOG_ERROR, "Invalid run length %d.\n", count); |
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return AVERROR_INVALIDDATA; |
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} |
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✓✓ |
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if (avctx->pix_fmt == AV_PIX_FMT_BGR24) { |
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pixel = bytestream2_get_be24(&gb); |
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✓✓ |
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for (i = 0; i < count; i++) { |
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AV_WB24(out_buf, pixel); |
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out_buf += 3; |
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} |
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} else { // AV_PIX_FMT_GRAY8 |
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pixel = bytestream2_get_byte(&gb); |
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✓✓ |
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for (i = 0; i < count; i++) |
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*out_buf++ = pixel; |
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} |
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x += i; |
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} |
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✓✗✗✓
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if (x != width || y != height) { |
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av_log(avctx, AV_LOG_ERROR, "Picture stopped at %d,%d.\n", x, y); |
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return AVERROR_INVALIDDATA; |
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} |
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*got_frame = 1; |
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return avpkt->size; |
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} |
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AVCodec ff_alias_pix_decoder = { |
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.name = "alias_pix", |
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.long_name = NULL_IF_CONFIG_SMALL("Alias/Wavefront PIX image"), |
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.type = AVMEDIA_TYPE_VIDEO, |
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.id = AV_CODEC_ID_ALIAS_PIX, |
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.decode = decode_frame, |
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.capabilities = AV_CODEC_CAP_DR1, |
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}; |