| /* |
| * 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" |
| #include "internal.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 *got_frame, |
| 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 = ff_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]; |
| int i; |
| |
| 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 (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; |
| *got_frame = 1; |
| |
| 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"), |
| }; |