mirror of https://git.ffmpeg.org/ffmpeg.git
308 lines
8.6 KiB
C
308 lines
8.6 KiB
C
/*
|
|
* MidiVid Archive codec
|
|
*
|
|
* Copyright (c) 2019 Paul B Mahol
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
#define CACHED_BITSTREAM_READER !ARCH_X86_32
|
|
#include "libavutil/intreadwrite.h"
|
|
|
|
#include "avcodec.h"
|
|
#include "codec_internal.h"
|
|
#include "decode.h"
|
|
#include "get_bits.h"
|
|
#include "lossless_videodsp.h"
|
|
#include "zlib_wrapper.h"
|
|
|
|
#include <zlib.h>
|
|
|
|
typedef struct MVHAContext {
|
|
GetBitContext gb;
|
|
int nb_symbols;
|
|
|
|
uint8_t symb[256];
|
|
uint32_t prob[256];
|
|
VLC vlc;
|
|
|
|
FFZStream zstream;
|
|
LLVidDSPContext llviddsp;
|
|
} MVHAContext;
|
|
|
|
typedef struct Node {
|
|
int16_t sym;
|
|
int16_t n0;
|
|
int16_t l, r;
|
|
uint32_t count;
|
|
} Node;
|
|
|
|
static void get_tree_codes(uint32_t *bits, int16_t *lens, uint8_t *xlat,
|
|
Node *nodes, int node,
|
|
uint32_t pfx, int pl, int *pos)
|
|
{
|
|
int s;
|
|
|
|
s = nodes[node].sym;
|
|
if (s != -1) {
|
|
bits[*pos] = (~pfx) & ((1ULL << FFMAX(pl, 1)) - 1);
|
|
lens[*pos] = FFMAX(pl, 1);
|
|
xlat[*pos] = s + (pl == 0);
|
|
(*pos)++;
|
|
} else {
|
|
pfx <<= 1;
|
|
pl++;
|
|
get_tree_codes(bits, lens, xlat, nodes, nodes[node].l, pfx, pl,
|
|
pos);
|
|
pfx |= 1;
|
|
get_tree_codes(bits, lens, xlat, nodes, nodes[node].r, pfx, pl,
|
|
pos);
|
|
}
|
|
}
|
|
|
|
static int build_vlc(AVCodecContext *avctx, VLC *vlc)
|
|
{
|
|
MVHAContext *s = avctx->priv_data;
|
|
Node nodes[512];
|
|
uint32_t bits[256];
|
|
int16_t lens[256];
|
|
uint8_t xlat[256];
|
|
int cur_node, i, j, pos = 0;
|
|
|
|
ff_free_vlc(vlc);
|
|
|
|
for (i = 0; i < s->nb_symbols; i++) {
|
|
nodes[i].count = s->prob[i];
|
|
nodes[i].sym = s->symb[i];
|
|
nodes[i].n0 = -2;
|
|
nodes[i].l = i;
|
|
nodes[i].r = i;
|
|
}
|
|
|
|
cur_node = s->nb_symbols;
|
|
j = 0;
|
|
do {
|
|
for (i = 0; ; i++) {
|
|
int new_node = j;
|
|
int first_node = cur_node;
|
|
int second_node = cur_node;
|
|
unsigned nd, st;
|
|
|
|
nodes[cur_node].count = -1;
|
|
|
|
do {
|
|
int val = nodes[new_node].count;
|
|
if (val && (val < nodes[first_node].count)) {
|
|
if (val >= nodes[second_node].count) {
|
|
first_node = new_node;
|
|
} else {
|
|
first_node = second_node;
|
|
second_node = new_node;
|
|
}
|
|
}
|
|
new_node += 1;
|
|
} while (new_node != cur_node);
|
|
|
|
if (first_node == cur_node)
|
|
break;
|
|
|
|
nd = nodes[second_node].count;
|
|
st = nodes[first_node].count;
|
|
nodes[second_node].count = 0;
|
|
nodes[first_node].count = 0;
|
|
if (nd >= UINT32_MAX - st) {
|
|
av_log(avctx, AV_LOG_ERROR, "count overflow\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
nodes[cur_node].count = nd + st;
|
|
nodes[cur_node].sym = -1;
|
|
nodes[cur_node].n0 = cur_node;
|
|
nodes[cur_node].l = first_node;
|
|
nodes[cur_node].r = second_node;
|
|
cur_node++;
|
|
}
|
|
j++;
|
|
} while (cur_node - s->nb_symbols == j);
|
|
|
|
get_tree_codes(bits, lens, xlat, nodes, cur_node - 1, 0, 0, &pos);
|
|
|
|
return ff_init_vlc_sparse(vlc, 12, pos, lens, 2, 2, bits, 4, 4, xlat, 1, 1, 0);
|
|
}
|
|
|
|
static int decode_frame(AVCodecContext *avctx, AVFrame *frame,
|
|
int *got_frame, AVPacket *avpkt)
|
|
{
|
|
MVHAContext *s = avctx->priv_data;
|
|
uint32_t type, size;
|
|
int ret;
|
|
|
|
if (avpkt->size <= 8)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
type = AV_RB32(avpkt->data);
|
|
size = AV_RL32(avpkt->data + 4);
|
|
|
|
if (size < 1 || size >= avpkt->size)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
|
|
return ret;
|
|
|
|
if (type == MKTAG('L','Z','Y','V')) {
|
|
z_stream *const zstream = &s->zstream.zstream;
|
|
ret = inflateReset(zstream);
|
|
if (ret != Z_OK) {
|
|
av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", ret);
|
|
return AVERROR_EXTERNAL;
|
|
}
|
|
|
|
zstream->next_in = avpkt->data + 8;
|
|
zstream->avail_in = avpkt->size - 8;
|
|
|
|
for (int p = 0; p < 3; p++) {
|
|
for (int y = 0; y < avctx->height; y++) {
|
|
zstream->next_out = frame->data[p] + (avctx->height - y - 1) * frame->linesize[p];
|
|
zstream->avail_out = avctx->width >> (p > 0);
|
|
|
|
ret = inflate(zstream, Z_SYNC_FLUSH);
|
|
if (ret != Z_OK && ret != Z_STREAM_END) {
|
|
av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", ret);
|
|
return AVERROR_EXTERNAL;
|
|
}
|
|
}
|
|
}
|
|
} else if (type == MKTAG('H','U','F','Y')) {
|
|
GetBitContext *gb = &s->gb;
|
|
int first_symbol, symbol;
|
|
|
|
ret = init_get_bits8(gb, avpkt->data + 8, avpkt->size - 8);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
skip_bits(gb, 24);
|
|
|
|
first_symbol = get_bits(gb, 8);
|
|
s->nb_symbols = get_bits(gb, 8) + 1;
|
|
|
|
symbol = first_symbol;
|
|
for (int i = 0; i < s->nb_symbols; symbol++) {
|
|
int prob;
|
|
|
|
if (get_bits_left(gb) < 4)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
if (get_bits1(gb)) {
|
|
prob = get_bits(gb, 12);
|
|
} else {
|
|
prob = get_bits(gb, 3);
|
|
}
|
|
|
|
if (prob) {
|
|
s->symb[i] = symbol;
|
|
s->prob[i] = prob;
|
|
i++;
|
|
}
|
|
}
|
|
|
|
ret = build_vlc(avctx, &s->vlc);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
for (int p = 0; p < 3; p++) {
|
|
int width = avctx->width >> (p > 0);
|
|
ptrdiff_t stride = frame->linesize[p];
|
|
uint8_t *dst;
|
|
|
|
dst = frame->data[p] + (avctx->height - 1) * frame->linesize[p];
|
|
for (int y = 0; y < avctx->height; y++) {
|
|
if (get_bits_left(gb) < width)
|
|
return AVERROR_INVALIDDATA;
|
|
for (int x = 0; x < width; x++) {
|
|
int v = get_vlc2(gb, s->vlc.table, s->vlc.bits, 3);
|
|
|
|
if (v < 0)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
dst[x] = v;
|
|
}
|
|
dst -= stride;
|
|
}
|
|
}
|
|
} else {
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
for (int p = 0; p < 3; p++) {
|
|
int left, lefttop;
|
|
int width = avctx->width >> (p > 0);
|
|
ptrdiff_t stride = frame->linesize[p];
|
|
uint8_t *dst;
|
|
|
|
dst = frame->data[p] + (avctx->height - 1) * frame->linesize[p];
|
|
s->llviddsp.add_left_pred(dst, dst, width, 0);
|
|
if (avctx->height > 1) {
|
|
dst -= stride;
|
|
lefttop = left = dst[0];
|
|
for (int y = 1; y < avctx->height; y++) {
|
|
s->llviddsp.add_median_pred(dst, dst + stride, dst, width, &left, &lefttop);
|
|
lefttop = left = dst[0];
|
|
dst -= stride;
|
|
}
|
|
}
|
|
}
|
|
|
|
frame->pict_type = AV_PICTURE_TYPE_I;
|
|
frame->key_frame = 1;
|
|
*got_frame = 1;
|
|
|
|
return avpkt->size;
|
|
}
|
|
|
|
static av_cold int decode_init(AVCodecContext *avctx)
|
|
{
|
|
MVHAContext *s = avctx->priv_data;
|
|
|
|
avctx->pix_fmt = AV_PIX_FMT_YUV422P;
|
|
|
|
ff_llviddsp_init(&s->llviddsp);
|
|
|
|
return ff_inflate_init(&s->zstream, avctx);
|
|
}
|
|
|
|
static av_cold int decode_close(AVCodecContext *avctx)
|
|
{
|
|
MVHAContext *s = avctx->priv_data;
|
|
|
|
ff_inflate_end(&s->zstream);
|
|
ff_free_vlc(&s->vlc);
|
|
|
|
return 0;
|
|
}
|
|
|
|
const FFCodec ff_mvha_decoder = {
|
|
.p.name = "mvha",
|
|
CODEC_LONG_NAME("MidiVid Archive Codec"),
|
|
.p.type = AVMEDIA_TYPE_VIDEO,
|
|
.p.id = AV_CODEC_ID_MVHA,
|
|
.priv_data_size = sizeof(MVHAContext),
|
|
.init = decode_init,
|
|
.close = decode_close,
|
|
FF_CODEC_DECODE_CB(decode_frame),
|
|
.p.capabilities = AV_CODEC_CAP_DR1,
|
|
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
|
|
};
|