/* * BRender PIX (.pix) image decoder * Copyright (c) 2012 Aleksi Nurmi * * 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 */ /* * Tested against samples from I-War / Independence War and Defiance. * If the PIX file does not contain a palette, the * palette_has_changed property of the AVFrame is set to 0. */ #include "libavutil/imgutils.h" #include "avcodec.h" #include "bytestream.h" typedef struct BRPixContext { AVFrame frame; } BRPixContext; typedef struct BRPixHeader { int format; unsigned int width, height; } BRPixHeader; static av_cold int brpix_init(AVCodecContext *avctx) { BRPixContext *s = avctx->priv_data; avcodec_get_frame_defaults(&s->frame); avctx->coded_frame = &s->frame; return 0; } static int brpix_decode_header(BRPixHeader *out, GetByteContext *pgb) { unsigned int header_len = bytestream2_get_be32(pgb); out->format = bytestream2_get_byte(pgb); bytestream2_skip(pgb, 2); out->width = bytestream2_get_be16(pgb); out->height = bytestream2_get_be16(pgb); // the header is at least 11 bytes long; we read the first 7 if (header_len < 11) { return 0; } // skip the rest of the header bytestream2_skip(pgb, header_len-7); return 1; } static int brpix_decode_frame(AVCodecContext *avctx, void *data, int *data_size_out, AVPacket *avpkt) { BRPixContext *s = avctx->priv_data; AVFrame *frame_out = data; int ret; GetByteContext gb; unsigned int bytes_pp; unsigned int magic[4]; unsigned int chunk_type; unsigned int data_len; BRPixHeader hdr; bytestream2_init(&gb, avpkt->data, avpkt->size); magic[0] = bytestream2_get_be32(&gb); magic[1] = bytestream2_get_be32(&gb); magic[2] = bytestream2_get_be32(&gb); magic[3] = bytestream2_get_be32(&gb); if (magic[0] != 0x12 || magic[1] != 0x8 || magic[2] != 0x2 || magic[3] != 0x2) { av_log(avctx, AV_LOG_ERROR, "Not a BRender PIX file\n"); return AVERROR_INVALIDDATA; } chunk_type = bytestream2_get_be32(&gb); if (chunk_type != 0x3 && chunk_type != 0x3d) { av_log(avctx, AV_LOG_ERROR, "Invalid chunk type %d\n", chunk_type); return AVERROR_INVALIDDATA; } ret = brpix_decode_header(&hdr, &gb); if (!ret) { av_log(avctx, AV_LOG_ERROR, "Invalid header length\n"); return AVERROR_INVALIDDATA; } switch (hdr.format) { case 3: avctx->pix_fmt = AV_PIX_FMT_PAL8; bytes_pp = 1; break; case 4: avctx->pix_fmt = AV_PIX_FMT_RGB555BE; bytes_pp = 2; break; case 5: avctx->pix_fmt = AV_PIX_FMT_RGB565BE; bytes_pp = 2; break; case 6: avctx->pix_fmt = AV_PIX_FMT_RGB24; bytes_pp = 3; break; case 7: avctx->pix_fmt = AV_PIX_FMT_0RGB; bytes_pp = 4; break; case 18: avctx->pix_fmt = AV_PIX_FMT_GRAY8A; bytes_pp = 2; break; default: av_log(avctx, AV_LOG_ERROR, "Format %d is not supported\n", hdr.format); return AVERROR_PATCHWELCOME; } if (s->frame.data[0]) avctx->release_buffer(avctx, &s->frame); if (av_image_check_size(hdr.width, hdr.height, 0, avctx) < 0) return AVERROR_INVALIDDATA; if (hdr.width != avctx->width || hdr.height != avctx->height) avcodec_set_dimensions(avctx, hdr.width, hdr.height); if ((ret = avctx->get_buffer(avctx, &s->frame)) < 0) { av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); return ret; } chunk_type = bytestream2_get_be32(&gb); if (avctx->pix_fmt == AV_PIX_FMT_PAL8 && (chunk_type == 0x3 || chunk_type == 0x3d)) { BRPixHeader palhdr; uint32_t *pal_out = (uint32_t *)s->frame.data[1]; ret = brpix_decode_header(&palhdr, &gb); if (!ret) { av_log(avctx, AV_LOG_ERROR, "Invalid palette header length\n"); return AVERROR_INVALIDDATA; } if (palhdr.format != 7) { av_log(avctx, AV_LOG_ERROR, "Palette is not in 0RGB format\n"); return AVERROR_INVALIDDATA; } chunk_type = bytestream2_get_be32(&gb); data_len = bytestream2_get_be32(&gb); bytestream2_skip(&gb, 8); if (chunk_type != 0x21 || data_len != 1032 || bytestream2_get_bytes_left(&gb) < 1032) { av_log(avctx, AV_LOG_ERROR, "Invalid palette data\n"); return AVERROR_INVALIDDATA; } // convert 0RGB to machine endian format (ARGB32) for (int i = 0; i < 256; ++i) { bytestream2_skipu(&gb, 1); *pal_out++ = (0xFFU << 24) | bytestream2_get_be24u(&gb); } bytestream2_skip(&gb, 8); s->frame.palette_has_changed = 1; chunk_type = bytestream2_get_be32(&gb); } data_len = bytestream2_get_be32(&gb); bytestream2_skip(&gb, 8); // read the image data to the buffer { unsigned int bytes_per_scanline = bytes_pp * hdr.width; unsigned int bytes_left = bytestream2_get_bytes_left(&gb); if (chunk_type != 0x21 || data_len != bytes_left || bytes_left / bytes_per_scanline < hdr.height) { av_log(avctx, AV_LOG_ERROR, "Invalid image data\n"); return AVERROR_INVALIDDATA; } av_image_copy_plane(s->frame.data[0], s->frame.linesize[0], avpkt->data + bytestream2_tell(&gb), bytes_per_scanline, bytes_per_scanline, hdr.height); } *frame_out = s->frame; *data_size_out = sizeof(AVFrame); return avpkt->size; } static av_cold int brpix_end(AVCodecContext *avctx) { BRPixContext *s = avctx->priv_data; if(s->frame.data[0]) avctx->release_buffer(avctx, &s->frame); return 0; } AVCodec ff_brender_pix_decoder = { .name = "brender_pix", .type = AVMEDIA_TYPE_VIDEO, .id = AV_CODEC_ID_BRENDER_PIX, .priv_data_size = sizeof(BRPixContext), .init = brpix_init, .close = brpix_end, .decode = brpix_decode_frame, .capabilities = CODEC_CAP_DR1, .long_name = NULL_IF_CONFIG_SMALL("BRender PIX image"), };