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/*
* 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];
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;
*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"),
};
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