mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-29 10:52:20 +00:00
291 lines
8.8 KiB
C
291 lines
8.8 KiB
C
/*
|
|
* MidiVid decoder
|
|
* 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
|
|
*/
|
|
|
|
#include "libavutil/imgutils.h"
|
|
#include "libavutil/internal.h"
|
|
#include "libavutil/mem.h"
|
|
|
|
#define BITSTREAM_READER_LE
|
|
#include "avcodec.h"
|
|
#include "get_bits.h"
|
|
#include "bytestream.h"
|
|
#include "codec_internal.h"
|
|
#include "decode.h"
|
|
|
|
typedef struct MidiVidContext {
|
|
GetByteContext gb;
|
|
|
|
uint8_t *uncompressed;
|
|
unsigned int uncompressed_size;
|
|
uint8_t *skip;
|
|
|
|
AVFrame *frame;
|
|
} MidiVidContext;
|
|
|
|
static int decode_mvdv(MidiVidContext *s, AVCodecContext *avctx, AVFrame *frame)
|
|
{
|
|
GetByteContext *gb = &s->gb;
|
|
GetBitContext mask;
|
|
GetByteContext idx9;
|
|
uint16_t nb_vectors, intra_flag;
|
|
const uint8_t *vec;
|
|
const uint8_t *mask_start;
|
|
uint8_t *skip;
|
|
uint32_t mask_size;
|
|
int idx9bits = 0;
|
|
int idx9val = 0;
|
|
uint32_t nb_blocks;
|
|
|
|
nb_vectors = bytestream2_get_le16(gb);
|
|
intra_flag = !!bytestream2_get_le16(gb);
|
|
if (intra_flag) {
|
|
nb_blocks = (avctx->width / 2) * (avctx->height / 2);
|
|
} else {
|
|
int ret, skip_linesize, padding;
|
|
|
|
nb_blocks = bytestream2_get_le32(gb);
|
|
skip_linesize = avctx->width >> 1;
|
|
mask_start = gb->buffer_start + bytestream2_tell(gb);
|
|
mask_size = (FFALIGN(avctx->width, 32) >> 2) * (avctx->height >> 2) >> 3;
|
|
padding = (FFALIGN(avctx->width, 32) - avctx->width) >> 2;
|
|
|
|
if (bytestream2_get_bytes_left(gb) < mask_size)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
ret = init_get_bits8(&mask, mask_start, mask_size);
|
|
if (ret < 0)
|
|
return ret;
|
|
bytestream2_skip(gb, mask_size);
|
|
skip = s->skip;
|
|
|
|
for (int y = 0; y < avctx->height >> 2; y++) {
|
|
for (int x = 0; x < avctx->width >> 2; x++) {
|
|
int flag = !get_bits1(&mask);
|
|
|
|
skip[(y*2) *skip_linesize + x*2 ] = flag;
|
|
skip[(y*2) *skip_linesize + x*2+1] = flag;
|
|
skip[(y*2+1)*skip_linesize + x*2 ] = flag;
|
|
skip[(y*2+1)*skip_linesize + x*2+1] = flag;
|
|
}
|
|
skip_bits_long(&mask, padding);
|
|
}
|
|
}
|
|
|
|
vec = gb->buffer_start + bytestream2_tell(gb);
|
|
if (bytestream2_get_bytes_left(gb) < nb_vectors * 12)
|
|
return AVERROR_INVALIDDATA;
|
|
bytestream2_skip(gb, nb_vectors * 12);
|
|
if (nb_vectors > 256) {
|
|
if (bytestream2_get_bytes_left(gb) < (nb_blocks + 7 * !intra_flag) / 8)
|
|
return AVERROR_INVALIDDATA;
|
|
bytestream2_init(&idx9, gb->buffer_start + bytestream2_tell(gb), (nb_blocks + 7 * !intra_flag) / 8);
|
|
bytestream2_skip(gb, (nb_blocks + 7 * !intra_flag) / 8);
|
|
}
|
|
|
|
skip = s->skip;
|
|
|
|
for (int y = avctx->height - 2; y >= 0; y -= 2) {
|
|
uint8_t *dsty = frame->data[0] + y * frame->linesize[0];
|
|
uint8_t *dstu = frame->data[1] + y * frame->linesize[1];
|
|
uint8_t *dstv = frame->data[2] + y * frame->linesize[2];
|
|
|
|
for (int x = 0; x < avctx->width; x += 2) {
|
|
int idx;
|
|
|
|
if (!intra_flag && *skip++)
|
|
continue;
|
|
if (bytestream2_get_bytes_left(gb) <= 0)
|
|
return AVERROR_INVALIDDATA;
|
|
if (nb_vectors <= 256) {
|
|
idx = bytestream2_get_byte(gb);
|
|
} else {
|
|
if (idx9bits == 0) {
|
|
idx9val = bytestream2_get_byte(&idx9);
|
|
idx9bits = 8;
|
|
}
|
|
idx9bits--;
|
|
idx = bytestream2_get_byte(gb) | (((idx9val >> (7 - idx9bits)) & 1) << 8);
|
|
}
|
|
if (idx >= nb_vectors)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
dsty[x +frame->linesize[0]] = vec[idx * 12 + 0];
|
|
dsty[x+1+frame->linesize[0]] = vec[idx * 12 + 3];
|
|
dsty[x] = vec[idx * 12 + 6];
|
|
dsty[x+1] = vec[idx * 12 + 9];
|
|
|
|
dstu[x +frame->linesize[1]] = vec[idx * 12 + 1];
|
|
dstu[x+1+frame->linesize[1]] = vec[idx * 12 + 4];
|
|
dstu[x] = vec[idx * 12 + 7];
|
|
dstu[x+1] = vec[idx * 12 +10];
|
|
|
|
dstv[x +frame->linesize[2]] = vec[idx * 12 + 2];
|
|
dstv[x+1+frame->linesize[2]] = vec[idx * 12 + 5];
|
|
dstv[x] = vec[idx * 12 + 8];
|
|
dstv[x+1] = vec[idx * 12 +11];
|
|
}
|
|
}
|
|
|
|
return intra_flag;
|
|
}
|
|
|
|
static ptrdiff_t lzss_uncompress(MidiVidContext *s, GetByteContext *gb, uint8_t *dst, unsigned int size)
|
|
{
|
|
uint8_t *dst_start = dst;
|
|
uint8_t *dst_end = dst + size;
|
|
|
|
for (;bytestream2_get_bytes_left(gb) >= 3;) {
|
|
int op = bytestream2_get_le16(gb);
|
|
|
|
for (int i = 0; i < 16; i++) {
|
|
if (op & 1) {
|
|
int s0 = bytestream2_get_byte(gb);
|
|
int s1 = bytestream2_get_byte(gb);
|
|
int offset = ((s0 & 0xF0) << 4) | s1;
|
|
int length = (s0 & 0xF) + 3;
|
|
|
|
if (dst + length > dst_end ||
|
|
dst - offset < dst_start)
|
|
return AVERROR_INVALIDDATA;
|
|
if (offset > 0) {
|
|
for (int j = 0; j < length; j++) {
|
|
dst[j] = dst[j - offset];
|
|
}
|
|
}
|
|
dst += length;
|
|
} else {
|
|
if (dst >= dst_end)
|
|
return AVERROR_INVALIDDATA;
|
|
*dst++ = bytestream2_get_byte(gb);
|
|
}
|
|
op >>= 1;
|
|
}
|
|
}
|
|
|
|
return dst - dst_start;
|
|
}
|
|
|
|
static int decode_frame(AVCodecContext *avctx, AVFrame *rframe,
|
|
int *got_frame, AVPacket *avpkt)
|
|
{
|
|
MidiVidContext *s = avctx->priv_data;
|
|
GetByteContext *gb = &s->gb;
|
|
AVFrame *frame = s->frame;
|
|
int ret, key, uncompressed;
|
|
|
|
if (avpkt->size <= 13)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
bytestream2_init(gb, avpkt->data, avpkt->size);
|
|
bytestream2_skip(gb, 8);
|
|
uncompressed = bytestream2_get_le32(gb);
|
|
|
|
if (!uncompressed) {
|
|
av_fast_padded_malloc(&s->uncompressed, &s->uncompressed_size, 16LL * (avpkt->size - 12));
|
|
if (!s->uncompressed)
|
|
return AVERROR(ENOMEM);
|
|
|
|
ret = lzss_uncompress(s, gb, s->uncompressed, s->uncompressed_size);
|
|
if (ret < 0)
|
|
return ret;
|
|
bytestream2_init(gb, s->uncompressed, ret);
|
|
}
|
|
|
|
if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
|
|
return ret;
|
|
|
|
ret = decode_mvdv(s, avctx, frame);
|
|
|
|
if (ret < 0)
|
|
return ret;
|
|
key = ret;
|
|
|
|
if ((ret = av_frame_ref(rframe, s->frame)) < 0)
|
|
return ret;
|
|
|
|
frame->pict_type = key ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
|
|
if (key)
|
|
frame->flags |= AV_FRAME_FLAG_KEY;
|
|
else
|
|
frame->flags &= ~AV_FRAME_FLAG_KEY;
|
|
*got_frame = 1;
|
|
|
|
return avpkt->size;
|
|
}
|
|
|
|
static av_cold int decode_init(AVCodecContext *avctx)
|
|
{
|
|
MidiVidContext *s = avctx->priv_data;
|
|
int ret = av_image_check_size(avctx->width, avctx->height, 0, avctx);
|
|
|
|
if (avctx->width & 3 || avctx->height & 3)
|
|
ret = AVERROR_INVALIDDATA;
|
|
|
|
if (ret < 0) {
|
|
av_log(avctx, AV_LOG_ERROR, "Invalid image size %dx%d.\n",
|
|
avctx->width, avctx->height);
|
|
return ret;
|
|
}
|
|
|
|
avctx->pix_fmt = AV_PIX_FMT_YUV444P;
|
|
|
|
s->frame = av_frame_alloc();
|
|
if (!s->frame)
|
|
return AVERROR(ENOMEM);
|
|
s->skip = av_calloc(avctx->width >> 1, avctx->height >> 1);
|
|
if (!s->skip)
|
|
return AVERROR(ENOMEM);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void decode_flush(AVCodecContext *avctx)
|
|
{
|
|
MidiVidContext *s = avctx->priv_data;
|
|
|
|
av_frame_unref(s->frame);
|
|
}
|
|
|
|
static av_cold int decode_close(AVCodecContext *avctx)
|
|
{
|
|
MidiVidContext *s = avctx->priv_data;
|
|
|
|
av_frame_free(&s->frame);
|
|
av_freep(&s->uncompressed);
|
|
av_freep(&s->skip);
|
|
|
|
return 0;
|
|
}
|
|
|
|
const FFCodec ff_mvdv_decoder = {
|
|
.p.name = "mvdv",
|
|
CODEC_LONG_NAME("MidiVid VQ"),
|
|
.p.type = AVMEDIA_TYPE_VIDEO,
|
|
.p.id = AV_CODEC_ID_MVDV,
|
|
.priv_data_size = sizeof(MidiVidContext),
|
|
.init = decode_init,
|
|
FF_CODEC_DECODE_CB(decode_frame),
|
|
.flush = decode_flush,
|
|
.close = decode_close,
|
|
.p.capabilities = AV_CODEC_CAP_DR1,
|
|
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
|
|
};
|