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/*
* Vizrt Binary Image decoder
*
* 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
*/
/**
* @file
* Vizrt Binary Image decoder
*/
#include "avcodec.h"
#include "bytestream.h"
#include "codec_internal.h"
#include "decode.h"
#include "texturedsp.h"
#include "vbn.h"
#include "libavutil/imgutils.h"
typedef struct VBNContext {
TextureDSPContext texdsp;
TextureDSPThreadContext dec;
} VBNContext;
static av_cold int vbn_init(AVCodecContext *avctx)
{
VBNContext *ctx = avctx->priv_data;
ff_texturedsp_init(&ctx->texdsp);
return 0;
}
static int decompress(AVCodecContext *avctx, GetByteContext *gb,
int compression, uint8_t **outbuf)
{
if (compression == VBN_COMPRESSION_NONE) // outbuf is left NULL because gb->buf can be used directly
return bytestream2_get_bytes_left(gb);
av_log(avctx, AV_LOG_ERROR, "Unsupported VBN compression: 0x%08x\n", compression);
return AVERROR_PATCHWELCOME;
}
static int vbn_decode_frame(AVCodecContext *avctx,
AVFrame *frame, int *got_frame,
AVPacket *avpkt)
{
VBNContext *ctx = avctx->priv_data;
GetByteContext gb0, *const gb = &gb0;
uint8_t *image_buf = NULL;
int image_len;
int width, height, components, format, compression, pix_fmt, linesize, data_size;
int ret;
bytestream2_init(gb, avpkt->data, avpkt->size);
if (bytestream2_get_bytes_left(gb) < VBN_HEADER_SIZE) {
av_log(avctx, AV_LOG_ERROR, "VBN header truncated\n");
return AVERROR_INVALIDDATA;
}
if (bytestream2_get_le32u(gb) != VBN_MAGIC ||
bytestream2_get_le32u(gb) != VBN_MAJOR ||
bytestream2_get_le32u(gb) != VBN_MINOR) {
av_log(avctx, AV_LOG_ERROR, "Invalid VBN header\n");
return AVERROR_INVALIDDATA;
}
width = bytestream2_get_le32u(gb);
height = bytestream2_get_le32u(gb);
components = bytestream2_get_le32u(gb);
format = bytestream2_get_le32u(gb);
pix_fmt = bytestream2_get_le32u(gb);
bytestream2_get_le32u(gb); // mipmaps
data_size = bytestream2_get_le32u(gb);
bytestream2_seek(gb, VBN_HEADER_SIZE, SEEK_SET);
compression = format & 0xffffff00;
format = format & 0xff;
if (data_size != bytestream2_get_bytes_left(gb)) {
av_log(avctx, AV_LOG_ERROR, "Truncated packet\n");
return AVERROR_INVALIDDATA;
}
if (pix_fmt != VBN_PIX_RGBA && pix_fmt != VBN_PIX_RGB) {
av_log(avctx, AV_LOG_ERROR, "Unsupported pixel format: 0x%08x\n", pix_fmt);
return AVERROR_PATCHWELCOME;
}
ret = ff_set_dimensions(avctx, width, height);
if (ret < 0)
return ret;
if (format == VBN_FORMAT_RAW) {
if (pix_fmt == VBN_PIX_RGB && components == 3) {
avctx->pix_fmt = AV_PIX_FMT_RGB24;
linesize = avctx->width * 3;
} else if (pix_fmt == VBN_PIX_RGBA && components == 4) {
avctx->pix_fmt = AV_PIX_FMT_RGBA;
linesize = avctx->width * 4;
} else {
av_log(avctx, AV_LOG_ERROR, "Unsupported number of components: %d\n", components);
return AVERROR_PATCHWELCOME;
}
} else if (format == VBN_FORMAT_DXT1 || format == VBN_FORMAT_DXT5) {
if (avctx->width % TEXTURE_BLOCK_W || avctx->height % TEXTURE_BLOCK_H) {
av_log(avctx, AV_LOG_ERROR, "DXTx compression only supports 4 pixel aligned resolutions\n");
return AVERROR_INVALIDDATA;
}
avctx->pix_fmt = AV_PIX_FMT_RGBA;
if (format == VBN_FORMAT_DXT1) {
ctx->dec.tex_funct = ctx->texdsp.dxt1_block;
ctx->dec.tex_ratio = 8;
linesize = avctx->coded_width / 2;
} else {
ctx->dec.tex_funct = ctx->texdsp.dxt5_block;
ctx->dec.tex_ratio = 16;
linesize = avctx->coded_width;
}
} else {
av_log(avctx, AV_LOG_ERROR, "Unsupported VBN format: 0x%02x\n", format);
return AVERROR_PATCHWELCOME;
}
image_len = decompress(avctx, gb, compression, &image_buf);
if (image_len < 0)
return image_len;
if (image_len < linesize * avctx->coded_height) {
av_log(avctx, AV_LOG_ERROR, "Insufficent data\n");
ret = AVERROR_INVALIDDATA;
goto out;
}
ret = ff_get_buffer(avctx, frame, 0);
if (ret < 0)
goto out;
frame->pict_type = AV_PICTURE_TYPE_I;
frame->flags |= AV_FRAME_FLAG_KEY;
if (format == VBN_FORMAT_RAW) {
uint8_t *flipped = frame->data[0] + frame->linesize[0] * (frame->height - 1);
av_image_copy_plane(flipped, -frame->linesize[0], image_buf ? image_buf : gb->buffer, linesize, linesize, frame->height);
} else {
ctx->dec.slice_count = av_clip(avctx->thread_count, 1, avctx->coded_height / TEXTURE_BLOCK_H);
ctx->dec.tex_data.in = image_buf ? image_buf : gb->buffer;
ctx->dec.raw_ratio = 16;
ctx->dec.frame_data.out = frame->data[0] + frame->linesize[0] * (frame->height - 1);
ctx->dec.stride = -frame->linesize[0];
avctx->execute2(avctx, ff_texturedsp_decompress_thread, &ctx->dec, NULL, ctx->dec.slice_count);
}
*got_frame = 1;
ret = avpkt->size;
out:
av_freep(&image_buf);
return ret;
}
const FFCodec ff_vbn_decoder = {
.p.name = "vbn",
CODEC_LONG_NAME("Vizrt Binary Image"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_VBN,
.init = vbn_init,
FF_CODEC_DECODE_CB(vbn_decode_frame),
.priv_data_size = sizeof(VBNContext),
.p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_SLICE_THREADS,
};
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