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ffmpeg/libavcodec/fic.c

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/*
* Mirillis FIC decoder
*
* Copyright (c) 2014 Konstantin Shishkov
* Copyright (c) 2014 Derek Buitenhuis
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/common.h"
#include "avcodec.h"
#include "internal.h"
#include "dsputil.h"
#include "get_bits.h"
#include "golomb.h"
typedef struct FICThreadContext {
DECLARE_ALIGNED(16, int16_t, block)[64];
uint8_t *src;
int slice_h;
int src_size;
int y_off;
} FICThreadContext;
typedef struct FICContext {
AVCodecContext *avctx;
AVFrame *frame;
DSPContext dsp;
ScanTable scantable;
FICThreadContext *slice_data;
int slice_data_size;
const uint8_t *qmat;
enum AVPictureType cur_frame_type;
int aligned_width, aligned_height;
int num_slices, slice_h;
} FICContext;
static const uint8_t fic_qmat_hq[64] = {
1, 2, 2, 2, 3, 3, 3, 4,
2, 2, 2, 3, 3, 3, 4, 4,
2, 2, 3, 3, 3, 4, 4, 4,
2, 2, 3, 3, 3, 4, 4, 5,
2, 3, 3, 3, 4, 4, 5, 6,
3, 3, 3, 4, 4, 5, 6, 7,
3, 3, 3, 4, 4, 5, 7, 7,
3, 3, 4, 4, 5, 7, 7, 7,
};
static const uint8_t fic_qmat_lq[64] = {
1, 5, 6, 7, 8, 9, 9, 11,
5, 5, 7, 8, 9, 9, 11, 12,
6, 7, 8, 9, 9, 11, 11, 12,
7, 7, 8, 9, 9, 11, 12, 13,
7, 8, 9, 9, 10, 11, 13, 16,
8, 9, 9, 10, 11, 13, 16, 19,
8, 9, 9, 11, 12, 15, 18, 23,
9, 9, 11, 12, 15, 18, 23, 27
};
static const uint8_t fic_header[7] = { 0, 0, 1, 'F', 'I', 'C', 'V' };
#define FIC_HEADER_SIZE 27
static int fic_decode_block(FICContext *ctx, GetBitContext *gb,
uint8_t *dst, int stride, int16_t *block)
{
int i, num_coeff;
/* Is it a skip block? */
if (get_bits1(gb)) {
/* This is a P-frame. */
ctx->frame->key_frame = 0;
ctx->frame->pict_type = AV_PICTURE_TYPE_P;
return 0;
}
ctx->dsp.clear_block(block);
num_coeff = get_bits(gb, 7);
if (num_coeff > 64)
return AVERROR_INVALIDDATA;
for (i = 0; i < num_coeff; i++)
block[ctx->scantable.permutated[i]] = get_se_golomb(gb) * ctx->qmat[i];
ctx->dsp.idct_put(dst, stride, block);
return 0;
}
static int fic_decode_slice(AVCodecContext *avctx, void *tdata)
{
FICContext *ctx = avctx->priv_data;
FICThreadContext *tctx = tdata;
GetBitContext gb;
uint8_t *src = tctx->src;
int slice_h = tctx->slice_h;
int src_size = tctx->src_size;
int y_off = tctx->y_off;
int x, y, p;
init_get_bits(&gb, src, src_size * 8);
for (p = 0; p < 3; p++) {
int stride = ctx->frame->linesize[p];
uint8_t* dst = ctx->frame->data[p] + (y_off >> !!p) * stride;
for (y = 0; y < (slice_h >> !!p); y += 8) {
for (x = 0; x < (ctx->aligned_width >> !!p); x += 8) {
int ret;
if ((ret = fic_decode_block(ctx, &gb, dst + x, stride, tctx->block)) != 0)
return ret;
}
dst += 8 * stride;
}
}
return 0;
}
static int fic_decode_frame(AVCodecContext *avctx, void *data,
int *got_frame, AVPacket *avpkt)
{
FICContext *ctx = avctx->priv_data;
uint8_t *src = avpkt->data;
int ret;
int slice, nslices;
int msize;
int tsize;
uint8_t *sdata;
if ((ret = ff_reget_buffer(avctx, ctx->frame)) < 0) {
av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
return ret;
}
/* Header + at least one slice (4) */
if (avpkt->size < FIC_HEADER_SIZE + 4) {
av_log(avctx, AV_LOG_ERROR, "Frame data is too small.\n");
return AVERROR_INVALIDDATA;
}
/* Check for header. */
if (memcmp(src, fic_header, 7))
av_log(avctx, AV_LOG_WARNING, "Invalid FIC Header.\n");
/* Is it a skip frame? */
if (src[17])
goto skip;
nslices = src[13];
if (!nslices) {
av_log(avctx, AV_LOG_ERROR, "Zero slices found.\n");
return AVERROR_INVALIDDATA;
}
/* High or Low Quality Matrix? */
ctx->qmat = src[23] ? fic_qmat_hq : fic_qmat_lq;
/* Skip cursor data. */
tsize = AV_RB24(src + 24);
if (tsize > avpkt->size - FIC_HEADER_SIZE) {
av_log(avctx, AV_LOG_ERROR, "Invalid cursor data size.\n");
return AVERROR_INVALIDDATA;
}
/* Slice height for all but the last slice. */
ctx->slice_h = 16 * (ctx->aligned_height >> 4) / nslices;
if (ctx->slice_h % 16)
ctx->slice_h = FFALIGN(ctx->slice_h - 16, 16);
/* First slice offset and remaining data. */
sdata = src + tsize + FIC_HEADER_SIZE + 4 * nslices;
msize = avpkt->size - nslices * 4 - tsize - FIC_HEADER_SIZE;
if (msize <= 0) {
av_log(avctx, AV_LOG_ERROR, "Not enough frame data to decode.\n");
return AVERROR_INVALIDDATA;
}
/*
* Set the frametype to I initially. It will be set to P if the frame
* has any dependencies (skip blocks). There will be a race condition
* inside the slice decode function to set these, but we do not care.
* since they will only ever be set to 0/P.
*/
ctx->frame->key_frame = 1;
ctx->frame->pict_type = AV_PICTURE_TYPE_I;
/* Allocate slice data. */
av_fast_malloc(&ctx->slice_data, &ctx->slice_data_size,
nslices * sizeof(ctx->slice_data[0]));
if (!ctx->slice_data_size) {
av_log(avctx, AV_LOG_ERROR, "Could not allocate slice data.\n");
return AVERROR(ENOMEM);
}
for (slice = 0; slice < nslices; slice++) {
int slice_off = AV_RB32(src + tsize + FIC_HEADER_SIZE + slice * 4);
int slice_size;
int y_off = ctx->slice_h * slice;
int slice_h = ctx->slice_h;
/*
* Either read the slice size, or consume all data left.
* Also, special case the last slight height.
*/
if (slice == nslices - 1) {
slice_size = msize;
slice_h = FFALIGN(avctx->height - ctx->slice_h * (nslices - 1), 16);
} else {
slice_size = AV_RB32(src + tsize + FIC_HEADER_SIZE + slice * 4 + 4);
}
slice_size -= slice_off;
if (slice_off > msize || slice_off + slice_size > msize)
continue;
ctx->slice_data[slice].src = sdata + slice_off;
ctx->slice_data[slice].src_size = slice_size;
ctx->slice_data[slice].slice_h = slice_h;
ctx->slice_data[slice].y_off = y_off;
}
if (ret = avctx->execute(avctx, fic_decode_slice, ctx->slice_data,
NULL, nslices, sizeof(ctx->slice_data[0])) < 0)
return ret;
skip:
*got_frame = 1;
if ((ret = av_frame_ref(data, ctx->frame)) < 0)
return ret;
return avpkt->size;
}
static av_cold int fic_decode_close(AVCodecContext *avctx)
{
FICContext *ctx = avctx->priv_data;
av_freep(&ctx->slice_data);
av_frame_free(&ctx->frame);
return 0;
}
static av_cold int fic_decode_init(AVCodecContext *avctx)
{
FICContext *ctx = avctx->priv_data;
/* Initialize various context values */
ctx->avctx = avctx;
ctx->aligned_width = FFALIGN(avctx->width, 16);
ctx->aligned_height = FFALIGN(avctx->height, 16);
avctx->pix_fmt = AV_PIX_FMT_YUV420P;
avctx->bits_per_raw_sample = 8;
ctx->frame = av_frame_alloc();
if (!ctx->frame)
return AVERROR(ENOMEM);
ff_dsputil_init(&ctx->dsp, avctx);
ff_init_scantable(ctx->dsp.idct_permutation, &ctx->scantable, ff_zigzag_direct);
return 0;
}
AVCodec ff_fic_decoder = {
.name = "fic",
.long_name = NULL_IF_CONFIG_SMALL("Mirillis FIC"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_FIC,
.priv_data_size = sizeof(FICContext),
.init = fic_decode_init,
.decode = fic_decode_frame,
.close = fic_decode_close,
.capabilities = CODEC_CAP_DR1 | CODEC_CAP_SLICE_THREADS,
};
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