@@ -2888,6 +2888,7 @@ ipu_decoder_select="mpegvideodec"
jpegls_decoder_select="mjpeg_decoder"
jv_decoder_select="blockdsp"
lagarith_decoder_select="llviddsp"
+lead_decoder_select="idctdsp jpegtables"
ljpeg_encoder_select="jpegtables"
lscr_decoder_select="inflate_wrapper"
magicyuv_decoder_select="llviddsp"
@@ -997,6 +997,7 @@ following image formats are supported:
@item Lagarith @tab @tab X
@item LCL (LossLess Codec Library) MSZH @tab @tab X
@item LCL (LossLess Codec Library) ZLIB @tab E @tab E
+@item LEAD MCMP @tab @tab X
@item LOCO @tab @tab X
@item LucasArts SANM/Smush @tab @tab X
@tab Used in LucasArts games / SMUSH animations.
@@ -477,6 +477,7 @@ OBJS-$(CONFIG_JV_DECODER) += jvdec.o
OBJS-$(CONFIG_KGV1_DECODER) += kgv1dec.o
OBJS-$(CONFIG_KMVC_DECODER) += kmvc.o
OBJS-$(CONFIG_LAGARITH_DECODER) += lagarith.o lagarithrac.o
+OBJS-$(CONFIG_LEAD_DECODER) += leaddec.o jpegquanttables.o
OBJS-$(CONFIG_LJPEG_ENCODER) += ljpegenc.o mjpegenc_common.o
OBJS-$(CONFIG_LOCO_DECODER) += loco.o
OBJS-$(CONFIG_LSCR_DECODER) += lscrdec.o png.o pngdec.o pngdsp.o
@@ -188,6 +188,7 @@ extern const FFCodec ff_jv_decoder;
extern const FFCodec ff_kgv1_decoder;
extern const FFCodec ff_kmvc_decoder;
extern const FFCodec ff_lagarith_decoder;
+extern const FFCodec ff_lead_decoder;
extern const FFCodec ff_ljpeg_encoder;
extern const FFCodec ff_loco_decoder;
extern const FFCodec ff_lscr_decoder;
@@ -1960,6 +1960,13 @@ static const AVCodecDescriptor codec_descriptors[] = {
.long_name = NULL_IF_CONFIG_SMALL("vMix Video"),
.props = AV_CODEC_PROP_INTRA_ONLY | AV_CODEC_PROP_LOSSY,
},
+ {
+ .id = AV_CODEC_ID_LEAD,
+ .type = AVMEDIA_TYPE_VIDEO,
+ .name = "lead",
+ .long_name = NULL_IF_CONFIG_SMALL("LEAD MCMP"),
+ .props = AV_CODEC_PROP_INTRA_ONLY | AV_CODEC_PROP_LOSSY,
+ },
/* various PCM "codecs" */
{
@@ -324,6 +324,7 @@ enum AVCodecID {
AV_CODEC_ID_EVC,
AV_CODEC_ID_RTV1,
AV_CODEC_ID_VMIX,
+ AV_CODEC_ID_LEAD,
/* various PCM "codecs" */
AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
new file mode 100644
@@ -0,0 +1,62 @@
+/*
+ * LEAD MCMP decoder tables
+ *
+ * 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
+ */
+
+#ifndef AVCODEC_LEADDATA_H
+#define AVCODEC_LEADDATA_H
+
+#include <stdint.h>
+
+static const uint8_t luma_dc_len[]={
+ 2, 3, 3, 3, 3, 3, 4, 5, 6, 7, 8, 9
+};
+
+static const uint8_t chroma_dc_len[]={
+ 2, 2, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11
+};
+
+static const uint8_t luma_ac_len[]={
+ 2, 2, 3, 4, 4, 4, 5, 5, 5, 6, 6, 7, 7, 7, 7, 8,
+ 8, 8, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 11, 11, 11, 11,
+ 12, 12, 12, 12, 15, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
+ 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
+ 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
+ 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
+ 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
+ 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
+ 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
+ 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
+ 16, 16
+};
+
+static const uint8_t chroma_ac_len[]={
+ 2, 2, 3, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7,
+ 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10,
+ 11, 11, 11, 11, 12, 12, 12, 12, 14, 15, 15, 16, 16, 16, 16, 16,
+ 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
+ 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
+ 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
+ 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
+ 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
+ 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
+ 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
+ 16, 16
+};
+
+#endif /* AVCODEC_LEADDATA_H */
new file mode 100644
@@ -0,0 +1,270 @@
+/*
+ * LEAD MCMP decoder
+ *
+ * Copyright (c) 2023 Peter Ross
+ *
+ * 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 "avcodec.h"
+#include "blockdsp.h"
+#include "codec_internal.h"
+#include "copy_block.h"
+#include "decode.h"
+#include "get_bits.h"
+#include "idctdsp.h"
+#include "jpegquanttables.h"
+#include "jpegtables.h"
+#include "leaddata.h"
+#include "libavutil/mem_internal.h"
+#include "libavutil/thread.h"
+
+#define LUMA_DC_BITS 9
+#define CHROMA_DC_BITS 11
+#define LUMA_AC_BITS 10
+#define CHROMA_AC_BITS 10
+
+static VLC luma_dc_vlc;
+static VLC chroma_dc_vlc;
+static VLC luma_ac_vlc;
+static VLC chroma_ac_vlc;
+
+static av_cold void lead_init_static_data(void)
+{
+ VLC_INIT_STATIC_FROM_LENGTHS(&luma_dc_vlc, LUMA_DC_BITS, FF_ARRAY_ELEMS(luma_dc_len),
+ luma_dc_len, 1,
+ 0, 0, 0,
+ 0, 0, 1 << LUMA_DC_BITS);
+ VLC_INIT_STATIC_FROM_LENGTHS(&chroma_dc_vlc, CHROMA_DC_BITS, FF_ARRAY_ELEMS(chroma_dc_len),
+ chroma_dc_len, 1,
+ 0, 0, 0,
+ 0, 0, 1 << CHROMA_DC_BITS);
+ VLC_INIT_STATIC_FROM_LENGTHS(&luma_ac_vlc, LUMA_AC_BITS, FF_ARRAY_ELEMS(luma_ac_len),
+ luma_ac_len, 1,
+ ff_mjpeg_val_ac_luminance, 1, 1,
+ 0, 0, 1160);
+ VLC_INIT_STATIC_FROM_LENGTHS(&chroma_ac_vlc, CHROMA_AC_BITS, FF_ARRAY_ELEMS(chroma_ac_len),
+ chroma_ac_len, 1,
+ ff_mjpeg_val_ac_chrominance, 1, 1,
+ 0, 0, 1160);
+}
+
+typedef struct LeadContext {
+ uint8_t *bitstream_buf;
+ unsigned int bitstream_buf_size;
+ BlockDSPContext bdsp;
+ IDCTDSPContext idsp;
+ uint8_t permutated_scantable[64];
+} LeadContext;
+
+static av_cold int lead_decode_init(AVCodecContext * avctx)
+{
+ static AVOnce init_static_once = AV_ONCE_INIT;
+ LeadContext *s = avctx->priv_data;
+
+ if (avctx->extradata_size < 20)
+ return AVERROR_INVALIDDATA;
+
+ ff_blockdsp_init(&s->bdsp);
+ ff_idctdsp_init(&s->idsp, avctx);
+ ff_permute_scantable(s->permutated_scantable, ff_zigzag_direct, s->idsp.idct_permutation);
+
+ ff_thread_once(&init_static_once, lead_init_static_data);
+
+ return 0;
+}
+
+static void calc_dequant(uint16_t * dequant, const uint8_t * quant_tbl, int q)
+{
+ for (int i = 0; i < 64; i++)
+ dequant[i] = av_clip(q * quant_tbl[ff_zigzag_direct[i]] / 50, 2, 32767);
+}
+
+static int decode_block(LeadContext * s, GetBitContext * gb,
+ const VLCElem * dc_table, int dc_bits, const VLCElem * ac_table, int ac_bits,
+ int16_t * dc_pred, const uint16_t * dequant,
+ uint8_t * dst, int stride)
+{
+ DECLARE_ALIGNED(32, int16_t, block)[64];
+ int size;
+
+ s->bdsp.clear_block(block);
+
+ size = get_vlc2(gb, dc_table, dc_bits, 1);
+ if (size < 0)
+ return AVERROR_INVALIDDATA;
+
+ if (size)
+ *dc_pred += get_xbits(gb, size);
+
+ block[0] = (1 << 10) + *dc_pred * dequant[0];
+
+ for (int i = 1; i < 64; i++) {
+ int symbol = get_vlc2(gb, ac_table, ac_bits, 2);
+ if (symbol < 0)
+ return AVERROR_INVALIDDATA;
+
+ if (!symbol)
+ break;
+
+ i += symbol >> 4;
+ if (i >= 64)
+ return AVERROR_INVALIDDATA;
+
+ size = symbol & 0xF;
+ if (size)
+ block[s->permutated_scantable[i]] = get_xbits(gb, size) * dequant[i];
+ }
+
+ s->idsp.idct_put(dst, stride, block);
+ return 0;
+}
+
+static int lead_decode_frame(AVCodecContext *avctx, AVFrame * frame,
+ int * got_frame, AVPacket * avpkt)
+{
+ LeadContext *s = avctx->priv_data;
+ const uint8_t * buf = avpkt->data;
+ int ret, format, yuv20p_half = 0, fields = 1, q, size;
+ GetBitContext gb;
+ int16_t dc_pred[3] = {0, 0, 0};
+ uint16_t dequant[2][64];
+
+ if (avpkt->size < 8)
+ return AVERROR_INVALIDDATA;
+
+ format = AV_RL16(buf + 4);
+ switch(format) {
+ case 0x8000:
+ yuv20p_half = 1;
+ // fall-through
+ case 0x1000:
+ avctx->pix_fmt = AV_PIX_FMT_YUV420P;
+ break;
+ case 0x2000:
+ avctx->pix_fmt = AV_PIX_FMT_YUV444P;
+ break;
+ case 0x2006:
+ avctx->pix_fmt = AV_PIX_FMT_YUV444P;
+ fields = 2;
+ break;
+ default:
+ avpriv_request_sample(avctx, "unsupported format 0x%x", format);
+ return AVERROR_PATCHWELCOME;
+ }
+
+ q = AV_RL16(buf + 6);
+ calc_dequant(dequant[0], ff_mjpeg_std_luminance_quant_tbl, q);
+ calc_dequant(dequant[1], ff_mjpeg_std_chrominance_quant_tbl, q);
+
+ if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
+ return ret;
+
+ frame->flags |= AV_FRAME_FLAG_KEY;
+ frame->pict_type = AV_PICTURE_TYPE_I;
+
+ av_fast_padded_malloc(&s->bitstream_buf, &s->bitstream_buf_size, avpkt->size - 8);
+ if (!s->bitstream_buf)
+ return AVERROR(ENOMEM);
+
+ size = 0;
+ for (int i = 8; i < avpkt->size; i++) {
+ int src = buf[i] ^ 0x80;
+ s->bitstream_buf[size++] = src;
+ if (src == 0xFF && i + 1 < avpkt->size && (buf[i + 1] ^ 0x80) == 0x00)
+ i++;
+ }
+
+ init_get_bits8(&gb, s->bitstream_buf, size);
+
+ if (avctx->pix_fmt == AV_PIX_FMT_YUV420P) {
+ for (int mb_y = 0; mb_y < avctx->height / 16; mb_y++)
+ for (int mb_x = 0; mb_x < avctx->width / 16; mb_x++)
+ for (int b = 0; b < (yuv20p_half ? 4 : 6); b++) {
+ int luma_block = yuv20p_half ? 2 : 4;
+ const VLCElem * dc_vlc = b < luma_block ? luma_dc_vlc.table : chroma_dc_vlc.table;
+ int dc_bits = b < luma_block ? LUMA_DC_BITS : CHROMA_DC_BITS;
+ const VLCElem * ac_vlc = b < luma_block ? luma_ac_vlc.table : chroma_ac_vlc.table;
+ int ac_bits = b < luma_block ? LUMA_AC_BITS : CHROMA_AC_BITS;
+ int plane = b < luma_block ? 0 : b - (yuv20p_half ? 1 : 3);
+ int x, y;
+
+ if (b < luma_block) {
+ y = 16*mb_y + 8*(b >> 1);
+ x = 16*mb_x + 8*(b & 1);
+ } else {
+ y = 8*mb_y;
+ x = 8*mb_x;
+ }
+
+ ret = decode_block(s, &gb, dc_vlc, dc_bits, ac_vlc, ac_bits,
+ dc_pred + plane, dequant[!(b < 4)],
+ frame->data[plane] + y*frame->linesize[plane] + x,
+ (yuv20p_half && b < 2 ? 2 : 1) * frame->linesize[plane]);
+ if (ret < 0)
+ return ret;
+
+ if (yuv20p_half && b < 2)
+ copy_block8(frame->data[plane] + (y + 1)*frame->linesize[plane] + x,
+ frame->data[plane] + y*frame->linesize[plane] + x,
+ 2*frame->linesize[plane], 2*frame->linesize[plane], 8);
+ }
+ } else {
+ for (int f = 0; f < fields; f++)
+ for (int j = 0; j < avctx->height / fields / 8; j++)
+ for (int i = 0; i < avctx->width / 8; i++)
+ for (int plane = 0; plane < 3; plane++) {
+ const VLCElem * dc_vlc = !plane ? luma_dc_vlc.table : chroma_dc_vlc.table;
+ int dc_bits = !plane ? LUMA_DC_BITS : CHROMA_DC_BITS;
+ const VLCElem * ac_vlc = !plane ? luma_ac_vlc.table : chroma_ac_vlc.table;
+ int ac_bits = !plane ? LUMA_AC_BITS : CHROMA_AC_BITS;
+
+ ret = decode_block(s, &gb, dc_vlc, dc_bits, ac_vlc, ac_bits,
+ dc_pred + plane, dequant[!!plane],
+ frame->data[plane] + (f + 8*j*fields)*frame->linesize[plane] + 8*i,
+ fields * frame->linesize[plane]);
+ if (ret < 0)
+ return ret;
+ }
+ }
+
+ *got_frame = 1;
+
+ return avpkt->size;
+}
+
+static av_cold int lead_decode_end(AVCodecContext * avctx)
+{
+ LeadContext *s = avctx->priv_data;
+
+ av_freep(&s->bitstream_buf);
+
+ return 0;
+}
+
+const FFCodec ff_lead_decoder = {
+ .p.name = "lead",
+ CODEC_LONG_NAME("LEAD MCMP"),
+ .p.type = AVMEDIA_TYPE_VIDEO,
+ .p.id = AV_CODEC_ID_LEAD,
+ .priv_data_size = sizeof(LeadContext),
+ .init = lead_decode_init,
+ .close = lead_decode_end,
+ FF_CODEC_DECODE_CB(lead_decode_frame),
+ .p.capabilities = AV_CODEC_CAP_DR1,
+ .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
+};
@@ -505,6 +505,7 @@ const AVCodecTag ff_codec_bmp_tags[] = {
{ AV_CODEC_ID_VQC, MKTAG('V', 'Q', 'C', '2') },
{ AV_CODEC_ID_RTV1, MKTAG('R', 'T', 'V', '1') },
{ AV_CODEC_ID_VMIX, MKTAG('V', 'M', 'X', '1') },
+ { AV_CODEC_ID_LEAD, MKTAG('L', 'E', 'A', 'D') },
{ AV_CODEC_ID_NONE, 0 }
};