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avcodec: add Gremlin Digital Video decoder

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Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2017-06-02 12:52:07 +02:00
parent 29bdcf588f
commit d1c08027d8
6 changed files with 415 additions and 1 deletions
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1
libavcodec/Makefile
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@ -308,6 +308,7 @@ OBJS-$(CONFIG_G723_1_DECODER) += g723_1dec.o g723_1.o \
OBJS-$(CONFIG_G723_1_ENCODER) += g723_1enc.o g723_1.o \
acelp_vectors.o celp_filters.o celp_math.o
OBJS-$(CONFIG_G729_DECODER) += g729dec.o lsp.o celp_math.o celp_filters.o acelp_filters.o acelp_pitch_delay.o acelp_vectors.o g729postfilter.o
OBJS-$(CONFIG_GDV_DECODER) += gdv.o
OBJS-$(CONFIG_GIF_DECODER) += gifdec.o lzw.o
OBJS-$(CONFIG_GIF_ENCODER) += gif.o lzwenc.o
OBJS-$(CONFIG_GREMLIN_DPCM_DECODER) += dpcm.o

1
libavcodec/allcodecs.c
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@ -195,6 +195,7 @@ static void register_all(void)
REGISTER_DECODER(FRAPS, fraps);
REGISTER_DECODER(FRWU, frwu);
REGISTER_DECODER(G2M, g2m);
REGISTER_DECODER(GDV, gdv);
REGISTER_ENCDEC (GIF, gif);
REGISTER_ENCDEC (H261, h261);
REGISTER_ENCDEC (H263, h263);

1
libavcodec/avcodec.h
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@ -446,6 +446,7 @@ enum AVCodecID {
AV_CODEC_ID_MSCC,
AV_CODEC_ID_SRGC,
AV_CODEC_ID_SVG,
AV_CODEC_ID_GDV,
/* various PCM "codecs" */
AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs

7
libavcodec/codec_desc.c
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@ -1410,6 +1410,13 @@ static const AVCodecDescriptor codec_descriptors[] = {
.long_name = NULL_IF_CONFIG_SMALL("Screen Recorder Gold Codec"),
.props = AV_CODEC_PROP_INTRA_ONLY | AV_CODEC_PROP_LOSSLESS,
},
{
.id = AV_CODEC_ID_GDV,
.type = AVMEDIA_TYPE_VIDEO,
.name = "gdv",
.long_name = NULL_IF_CONFIG_SMALL("Gremlin Digital Video"),
.props = AV_CODEC_PROP_LOSSY,
},
/* image codecs */
{

404
libavcodec/gdv.c Normal file
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@ -0,0 +1,404 @@
/*
* Gremlin Digital Video (GDV) decoder
* Copyright (c) 2017 Konstantin Shishkov
* Copyright (c) 2017 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/common.h"
#include "avcodec.h"
#include "bytestream.h"
#include "internal.h"
typedef struct GDVContext {
AVCodecContext *avctx;
GetByteContext gb;
GetByteContext g2;
PutByteContext pb;
uint32_t pal[256];
uint8_t *frame;
unsigned frame_size;
unsigned scale_h, scale_v;
} GDVContext;
typedef struct Bits32 {
uint32_t queue;
uint8_t fill;
} Bits32;
#define PREAMBLE_SIZE 4096
static av_cold int gdv_decode_init(AVCodecContext *avctx)
{
GDVContext *gdv = avctx->priv_data;
int i, j, k;
avctx->pix_fmt = AV_PIX_FMT_PAL8;
gdv->frame_size = avctx->width * avctx->height + PREAMBLE_SIZE;
gdv->frame = av_calloc(gdv->frame_size, 1);
if (!gdv->frame)
return AVERROR(ENOMEM);
for (i = 0; i < 2; i++) {
for (j = 0; j < 256; j++) {
for (k = 0; k < 8; k++) {
gdv->frame[i * 2048 + j * 8 + k] = j;
}
}
}
return 0;
}
static void rescale(GDVContext *gdv, uint8_t *dst, int w, int h, int scale_v, int scale_h)
{
int i, j, y, x;
if ((gdv->scale_v == scale_v) && (gdv->scale_h == scale_h)) {
return;
}
if (gdv->scale_h && gdv->scale_v) {
for (j = 0; j < h; j++) {
int y = h - j - 1;
for (i = 0; i < w; i++) {
int x = w - i - 1;
dst[PREAMBLE_SIZE + x + y * w] = dst[PREAMBLE_SIZE + x/2 + (y/2) * (w/2)];
}
}
} else if (gdv->scale_h) {
for (j = 0; j < h; j++) {
int y = h - j - 1;
for (x = 0; x < w; x++) {
dst[PREAMBLE_SIZE + x + y * w] = dst[PREAMBLE_SIZE + x + (y/2) * w];
}
}
} else if (gdv->scale_v) {
for (j = 0; j < h; j++) {
int y = h - j - 1;
for (i = 0; i < w; i++) {
int x = w - i - 1;
dst[PREAMBLE_SIZE + x + y * w] = dst[PREAMBLE_SIZE + x/2 + y * (w/2)];
}
}
}
if (scale_h && scale_v) {
for (y = 0; y < h/2; y++) {
for (x = 0; x < w/2; x++) {
dst[PREAMBLE_SIZE + x + y * (w/2)] = dst[PREAMBLE_SIZE + x*2 + y*2 * w];
}
}
} else if (scale_h) {
for (y = 0; y < h/2; y++) {
for (x = 0; x < w; x++) {
dst[PREAMBLE_SIZE + x + y * w] = dst[PREAMBLE_SIZE + x + y*2 * w];
}
}
} else if (scale_v) {
for (y = 0; y < h; y++) {
for (x = 0; x < w/2; x++) {
dst[PREAMBLE_SIZE + x + y * w] = dst[PREAMBLE_SIZE + x*2 + y * w];
}
}
}
gdv->scale_v = scale_v;
gdv->scale_h = scale_h;
}
static void fill_bits32(Bits32 *bits, GetByteContext *gb)
{
bits->queue = bytestream2_get_le32(gb);
bits->fill = 32;
}
static int read_bits32(Bits32 *bits, GetByteContext *gb, int nbits)
{
int res = bits->queue & ((1 << nbits) - 1);
bits->queue >>= nbits;
bits->fill -= nbits;
if (bits->fill <= 16) {
bits->queue |= bytestream2_get_le16(gb) << bits->fill;
bits->fill += 16;
}
return res;
}
static void lz_copy(PutByteContext *pb, GetByteContext *g2, int offset, unsigned len)
{
int i;
if (offset == -1) {
int c;
bytestream2_seek(g2, bytestream2_tell_p(pb) - 1, SEEK_SET);
c = bytestream2_get_byte(g2);
for (i = 0; i < len; i++) {
bytestream2_put_byte(pb, c);
}
} else if (offset < 0) {
int start = bytestream2_tell_p(pb) - (-offset);
bytestream2_seek(g2, start, SEEK_SET);
for (i = 0; i < len; i++) {
bytestream2_put_byte(pb, bytestream2_get_byte(g2));
}
} else {
int start = bytestream2_tell_p(pb) + offset;
bytestream2_seek(g2, start, SEEK_SET);
for (i = 0; i < len; i++) {
bytestream2_put_byte(pb, bytestream2_get_byte(g2));
}
}
}
static int decompress_68(AVCodecContext *avctx, unsigned skip, unsigned use8)
{
GDVContext *gdv = avctx->priv_data;
GetByteContext *gb = &gdv->gb;
GetByteContext *g2 = &gdv->g2;
PutByteContext *pb = &gdv->pb;
Bits32 bits;
bytestream2_init(g2, gdv->frame, gdv->frame_size);
bytestream2_skip_p(pb, skip + PREAMBLE_SIZE);
fill_bits32(&bits, gb);
while (bytestream2_get_bytes_left_p(pb) > 0 && bytestream2_get_bytes_left(gb) > 0) {
int tag = read_bits32(&bits, gb, 2);
if (tag == 0) {
int b = read_bits32(&bits, gb, 1);
if (b == 0) {
bytestream2_put_byte(pb, bytestream2_get_byte(gb));
} else {
int i, len = 2;
int lbits = 0;
while (1) {
int val;
lbits += 1;
val = read_bits32(&bits, gb, lbits);
len += val;
if (val != ((1 << lbits) - 1)) {
break;
}
assert(lbits < 16);
}
for (i = 0; i < len; i++) {
bytestream2_put_byte(pb, bytestream2_get_byte(gb));
}
}
} else if (tag == 1) {
int b = read_bits32(&bits, gb, 1);
int len;
if (b == 0) {
len = (read_bits32(&bits, gb, 4)) + 2;
} else {
int bb = bytestream2_get_byte(gb);
if ((bb & 0x80) == 0) {
len = bb + 18;
} else {
int top = (bb & 0x7F) << 8;
len = top + bytestream2_get_byte(gb) + 146;
}
}
bytestream2_skip_p(pb, len);
} else if (tag == 2) {
int i, subtag = read_bits32(&bits, gb, 2);
if (subtag != 3) {
int top = (read_bits32(&bits, gb, 4)) << 8;
int offs = top + bytestream2_get_byte(gb);
if ((subtag != 0) || (offs <= 0xF80)) {
int len = (subtag) + 3;
lz_copy(pb, g2, (offs) - 4096, len);
} else {
if (offs == 0xFFF) {
return 0;
}
int real_off = ((offs >> 4) & 0x7) + 1;
int len = ((offs & 0xF) + 2) * 2;
int c1 = gdv->frame[bytestream2_tell_p(pb) - real_off];
int c2 = gdv->frame[bytestream2_tell_p(pb) - real_off + 1];
for (i = 0; i < len/2; i++) {
bytestream2_put_byte(pb, c1);
bytestream2_put_byte(pb, c2);
}
}
} else {
int b = bytestream2_get_byte(gb);
int off = ((b & 0x7F)) + 1;
int len = ((b & 0x80) == 0) ? 2 : 3;
lz_copy(pb, g2, -off, len);
}
} else {
int len;
int off;
if (use8) {
int b = bytestream2_get_byte(gb);
if ((b & 0xC0) == 0xC0) {
len = ((b & 0x3F)) + 8;
int q = read_bits32(&bits, gb, 4);
off = (q << 8) + (bytestream2_get_byte(gb)) + 1;
} else {
int ofs1;
if ((b & 0x80) == 0) {
len = ((b >> 4)) + 6;
ofs1 = (b & 0xF);
} else {
len = ((b & 0x3F)) + 14;
ofs1 = read_bits32(&bits, gb, 4);
}
off = (ofs1 << 8) + (bytestream2_get_byte(gb)) - 4096;
}
} else {
int b = bytestream2_get_byte(gb);
if ((b >> 4) == 0xF) {
len = bytestream2_get_byte(gb) + 21;
} else {
len = (b >> 4) + 6;
}
int ofs1 = (b & 0xF);
off = (ofs1 << 8) + bytestream2_get_byte(gb) - 4096;
}
lz_copy(pb, g2, off, len);
}
}
return 0;
}
static int gdv_decode_frame(AVCodecContext *avctx, void *data,
int *got_frame, AVPacket *avpkt)
{
GDVContext *gdv = avctx->priv_data;
GetByteContext *gb = &gdv->gb;
PutByteContext *pb = &gdv->pb;
AVFrame *frame = data;
int ret, i, pal_size;
const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, &pal_size);
int compression;
unsigned flags;
uint8_t *dst;
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
return ret;
if (pal && pal_size == AVPALETTE_SIZE)
memcpy(gdv->pal, pal, AVPALETTE_SIZE);
bytestream2_init(gb, avpkt->data, avpkt->size);
bytestream2_init_writer(pb, gdv->frame, gdv->frame_size);
flags = bytestream2_get_le32(gb);
compression = flags & 0xF;
rescale(gdv, gdv->frame, avctx->width, avctx->height,
!!(flags & 0x10), !!(flags & 0x20));
switch (compression) {
case 1:
memset(gdv->frame + PREAMBLE_SIZE, 0, gdv->frame_size - PREAMBLE_SIZE);
case 0:
for (i = 0; i < 256; i++) {
unsigned r = bytestream2_get_byte(gb);
unsigned g = bytestream2_get_byte(gb);
unsigned b = bytestream2_get_byte(gb);
gdv->pal[i] = 0xFF << 24 | r << 18 | g << 10 | b << 2;
}
break;
case 3:
break;
case 6:
ret = decompress_68(avctx, flags >> 8, 0);
break;
case 8:
ret = decompress_68(avctx, flags >> 8, 1);
break;
default:
return AVERROR_INVALIDDATA;
}
memcpy(frame->data[1], gdv->pal, AVPALETTE_SIZE);
dst = frame->data[0];
if (!gdv->scale_v && !gdv->scale_h) {
int sidx = PREAMBLE_SIZE, didx = 0;
int y, x;
for (y = 0; y < avctx->height; y++) {
for (x = 0; x < avctx->width; x++) {
dst[x+didx] = gdv->frame[x+sidx];
}
sidx += avctx->width;
didx += frame->linesize[0];
}
} else {
int sidx = PREAMBLE_SIZE, didx = 0;
int y, x;
for (y = 0; y < avctx->height; y++) {
if (!gdv->scale_v) {
for (x = 0; x < avctx->width; x++) {
dst[didx + x] = gdv->frame[sidx + x];
}
} else {
for (x = 0; x < avctx->width; x++) {
dst[didx + x] = gdv->frame[sidx + x/2];
}
}
if (!gdv->scale_h || ((y & 1) == 1)) {
sidx += !gdv->scale_v ? avctx->width : avctx->width/2;
}
didx += frame->linesize[0];
}
}
*got_frame = 1;
return ret < 0 ? ret : avpkt->size;
}
static av_cold int gdv_decode_close(AVCodecContext *avctx)
{
GDVContext *gdv = avctx->priv_data;
av_freep(&gdv->frame);
return 0;
}
AVCodec ff_gdv_decoder = {
.name = "gdv",
.long_name = NULL_IF_CONFIG_SMALL("Gremlin Digital Video"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_GDV,
.priv_data_size = sizeof(GDVContext),
.init = gdv_decode_init,
.close = gdv_decode_close,
.decode = gdv_decode_frame,
.capabilities = AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
};

2
libavcodec/version.h
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@ -28,7 +28,7 @@
#include "libavutil/version.h"
#define LIBAVCODEC_VERSION_MAJOR 57
#define LIBAVCODEC_VERSION_MINOR 97
#define LIBAVCODEC_VERSION_MINOR 98
#define LIBAVCODEC_VERSION_MICRO 100
#define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \