Florian Nouwt:
> This video format is mainly used in older Nintendo DS games in a .vx
> container. It is the predecessor of the Mobiclip format.
>
> Signed-off-by: Florian Nouwt <fnou...@gmail.com>
> ---
> Changelog | 1 +
> configure | 1 +
> doc/general_contents.texi | 2 +
> libavcodec/Makefile | 1 +
> libavcodec/actimagine.c | 1644 +++++++++++++++++++++++++++++++++++++
> libavcodec/allcodecs.c | 1 +
> libavcodec/codec_desc.c | 7 +
> libavcodec/codec_id.h | 1 +
> libavcodec/version.h | 2 +-
> libavformat/riff.c | 2 +
> 10 files changed, 1661 insertions(+), 1 deletion(-)
> create mode 100644 libavcodec/actimagine.c
>
> diff --git a/Changelog b/Changelog
> index a96e350e09..8807f3dcb3 100644
> --- a/Changelog
> +++ b/Changelog
> @@ -83,6 +83,7 @@ version <next>:
> - msad video filter
> - gophers protocol
> - RIST protocol via librist
> +- Actimagine VX video decoder
>
>
> version 4.3:
> diff --git a/configure b/configure
> index f0ac719d2d..10a07da95f 100755
> --- a/configure
> +++ b/configure
> @@ -2662,6 +2662,7 @@ ac3_fixed_decoder_select="ac3_parser ac3dsp bswapdsp
> mdct"
> ac3_encoder_select="ac3dsp audiodsp mdct me_cmp"
> ac3_fixed_encoder_select="ac3dsp audiodsp mdct me_cmp"
> acelp_kelvin_decoder_select="audiodsp"
> +actimagine_decoder_select="bswapdsp golomb"
> adpcm_g722_decoder_select="g722dsp"
> adpcm_g722_encoder_select="g722dsp"
> aic_decoder_select="golomb idctdsp"
> diff --git a/doc/general_contents.texi b/doc/general_contents.texi
> index 33ece6e884..d4261386fc 100644
> --- a/doc/general_contents.texi
> +++ b/doc/general_contents.texi
> @@ -807,6 +807,8 @@ following image formats are supported:
> @item 8088flex TMV @tab @tab X
> @item A64 multicolor @tab X @tab
> @tab Creates video suitable to be played on a commodore 64 (multicolor
> mode).
> +@item Actimagine VX Video @tab @tab X
> + @tab fourcc: vxs1, VXS1
> @item Amazing Studio PAF Video @tab @tab X
> @item American Laser Games MM @tab @tab X
> @tab Used in games like Mad Dog McCree.
> diff --git a/libavcodec/Makefile b/libavcodec/Makefile
> index 81cc16471b..39b3bc968d 100644
> --- a/libavcodec/Makefile
> +++ b/libavcodec/Makefile
> @@ -182,6 +182,7 @@ OBJS-$(CONFIG_AC3_ENCODER) += ac3enc_float.o
> ac3enc.o ac3tab.o \
> OBJS-$(CONFIG_AC3_FIXED_ENCODER) += ac3enc_fixed.o ac3enc.o ac3tab.o
> ac3.o kbdwin.o
> OBJS-$(CONFIG_AC3_MF_ENCODER) += mfenc.o mf_utils.o
> OBJS-$(CONFIG_ACELP_KELVIN_DECODER) += g729dec.o lsp.o celp_math.o
> celp_filters.o acelp_filters.o acelp_pitch_delay.o acelp_vectors.o
> g729postfilter.o
> +OBJS-$(CONFIG_ACTIMAGINE_DECODER) += actimagine.o
> OBJS-$(CONFIG_AGM_DECODER) += agm.o
> OBJS-$(CONFIG_AIC_DECODER) += aic.o
> OBJS-$(CONFIG_ALAC_DECODER) += alac.o alac_data.o alacdsp.o
> diff --git a/libavcodec/actimagine.c b/libavcodec/actimagine.c
> new file mode 100644
> index 0000000000..6bb5126b05
> --- /dev/null
> +++ b/libavcodec/actimagine.c
> @@ -0,0 +1,1644 @@
> +/*
> + * Actimagine VX Video decoder
> + * Copyright (c) 2021 Florian Nouwt
> + *
> + * 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 <inttypes.h>
> +
> +#include "libavutil/avassert.h"
> +#include "libavutil/thread.h"
> +
> +#include "avcodec.h"
> +#include "bytestream.h"
> +#include "bswapdsp.h"
> +#include "get_bits.h"
> +#include "golomb.h"
> +#include "internal.h"
> +
> +static const uint8_t predict_dc_shift_tab[] = {1, 2, 3, 0, 4};
> +
> +static const uint8_t zigzag4x4_tab[] =
> +{
> + 0x00, 0x04, 0x01, 0x02, 0x05, 0x08, 0x0C, 0x09,
> + 0x06, 0x03, 0x07, 0x0A, 0x0D, 0x0E, 0x0B, 0x0F
> +};
> +
> +static const uint8_t quant4x4_tab[][8] =
> +{
> + { 0x0A, 0x0D, 0x0A, 0x0D, 0x0D, 0x10, 0x0D, 0x10 },
> + { 0x0B, 0x0E, 0x0B, 0x0E, 0x0E, 0x12, 0x0E, 0x12 },
> + { 0x0D, 0x10, 0x0D, 0x10, 0x10, 0x14, 0x10, 0x14 },
> + { 0x0E, 0x12, 0x0E, 0x12, 0x12, 0x17, 0x12, 0x17 },
> + { 0x10, 0x14, 0x10, 0x14, 0x14, 0x19, 0x14, 0x19 },
> + { 0x12, 0x17, 0x12, 0x17, 0x17, 0x1D, 0x17, 0x1D }
> +};
> +
> +static const uint8_t old_mb_mode_remap_tab[] =
> +{
> + 1, 2, 0, 4, 7, 3, 11, 15, 9, 5, 14, 6,
> + 12, 13, 8, 16, 23, 10, 22, 19, 20, 17, 21, 18
> +};
> +
> +static const uint8_t residu_mask_old_tab[] =
> +{
> + 0x00, 0x01, 0x02, 0x04, 0x08, 0x10, 0x03, 0x05,
> + 0x0A, 0x0C, 0x0F, 0x1F, 0x07, 0x0B, 0x0D, 0x0E,
> + 0x06, 0x09, 0x13, 0x15, 0x1A, 0x1C, 0x11, 0x12,
> + 0x14, 0x18, 0x17, 0x1B, 0x1D, 0x1E, 0x16, 0x19
> +};
> +
> +static const uint8_t residu_mask_new_tab[] =
> +{
> + 0x00, 0x08, 0x04, 0x02, 0x01, 0x1F, 0x0F, 0x0A,
> + 0x05, 0x0C, 0x03, 0x10, 0x0E, 0x0D, 0x0B, 0x07,
> + 0x09, 0x06, 0x1E, 0x1B, 0x1A, 0x1D, 0x17, 0x15,
> + 0x18, 0x12, 0x11, 0x1C, 0x14, 0x13, 0x16, 0x19
> +};
> +
> +static const int cavlc_suffix_len_update_tab[] =
> +{
> + 2, 5, 11, 23, 47, 32768
> +};
> +
> +// same tables as h264 cavlc
> +static const uint8_t coeff_token_table_index[17] =
> +{
> + 0, 0, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3
> +};
> +
> +static const uint8_t coeff_token_len[4][4 * 17] = {
> +{
> + 1, 0, 0, 0,
> + 6, 2, 0, 0, 8, 6, 3, 0, 9, 8, 7, 5, 10, 9, 8, 6,
> + 11,10, 9, 7, 13,11,10, 8, 13,13,11, 9, 13,13,13,10,
> + 14,14,13,11, 14,14,14,13, 15,15,14,14, 15,15,15,14,
> + 16,15,15,15, 16,16,16,15, 16,16,16,16, 16,16,16,16,
> +},
> +{
> + 2, 0, 0, 0,
> + 6, 2, 0, 0, 6, 5, 3, 0, 7, 6, 6, 4, 8, 6, 6, 4,
> + 8, 7, 7, 5, 9, 8, 8, 6, 11, 9, 9, 6, 11,11,11, 7,
> + 12,11,11, 9, 12,12,12,11, 12,12,12,11, 13,13,13,12,
> + 13,13,13,13, 13,14,13,13, 14,14,14,13, 14,14,14,14,
> +},
> +{
> + 4, 0, 0, 0,
> + 6, 4, 0, 0, 6, 5, 4, 0, 6, 5, 5, 4, 7, 5, 5, 4,
> + 7, 5, 5, 4, 7, 6, 6, 4, 7, 6, 6, 4, 8, 7, 7, 5,
> + 8, 8, 7, 6, 9, 8, 8, 7, 9, 9, 8, 8, 9, 9, 9, 8,
> + 10, 9, 9, 9, 10,10,10,10, 10,10,10,10, 10,10,10,10,
> +},
> +{
> + 6, 0, 0, 0,
> + 6, 6, 0, 0, 6, 6, 6, 0, 6, 6, 6, 6, 6, 6, 6, 6,
> + 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
> + 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
> + 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
> +}
> +};
> +
> +static const uint8_t coeff_token_bits[4][4 * 17] = {
> +{
> + 1, 0, 0, 0,
> + 5, 1, 0, 0, 7, 4, 1, 0, 7, 6, 5, 3, 7, 6, 5, 3,
> + 7, 6, 5, 4, 15, 6, 5, 4, 11,14, 5, 4, 8,10,13, 4,
> + 15,14, 9, 4, 11,10,13,12, 15,14, 9,12, 11,10,13, 8,
> + 15, 1, 9,12, 11,14,13, 8, 7,10, 9,12, 4, 6, 5, 8,
> +},
> +{
> + 3, 0, 0, 0,
> + 11, 2, 0, 0, 7, 7, 3, 0, 7,10, 9, 5, 7, 6, 5, 4,
> + 4, 6, 5, 6, 7, 6, 5, 8, 15, 6, 5, 4, 11,14,13, 4,
> + 15,10, 9, 4, 11,14,13,12, 8,10, 9, 8, 15,14,13,12,
> + 11,10, 9,12, 7,11, 6, 8, 9, 8,10, 1, 7, 6, 5, 4,
> +},
> +{
> + 15, 0, 0, 0,
> + 15,14, 0, 0, 11,15,13, 0, 8,12,14,12, 15,10,11,11,
> + 11, 8, 9,10, 9,14,13, 9, 8,10, 9, 8, 15,14,13,13,
> + 11,14,10,12, 15,10,13,12, 11,14, 9,12, 8,10,13, 8,
> + 13, 7, 9,12, 9,12,11,10, 5, 8, 7, 6, 1, 4, 3, 2,
> +},
> +{
> + 3, 0, 0, 0,
> + 0, 1, 0, 0, 4, 5, 6, 0, 8, 9,10,11, 12,13,14,15,
> + 16,17,18,19, 20,21,22,23, 24,25,26,27, 28,29,30,31,
> + 32,33,34,35, 36,37,38,39, 40,41,42,43, 44,45,46,47,
> + 48,49,50,51, 52,53,54,55, 56,57,58,59, 60,61,62,63,
> +}
> +};
> +
> +static const uint8_t total_zeros_len[16][16] = {
> + {1,3,3,4,4,5,5,6,6,7,7,8,8,9,9,9},
> + {3,3,3,3,3,4,4,4,4,5,5,6,6,6,6},
> + {4,3,3,3,4,4,3,3,4,5,5,6,5,6},
> + {5,3,4,4,3,3,3,4,3,4,5,5,5},
> + {4,4,4,3,3,3,3,3,4,5,4,5},
> + {6,5,3,3,3,3,3,3,4,3,6},
> + {6,5,3,3,3,2,3,4,3,6},
> + {6,4,5,3,2,2,3,3,6},
> + {6,6,4,2,2,3,2,5},
> + {5,5,3,2,2,2,4},
> + {4,4,3,3,1,3},
> + {4,4,2,1,3},
> + {3,3,1,2},
> + {2,2,1},
> + {1,1},
> +};
> +
> +static const uint8_t total_zeros_bits[16][16] = {
> + {1,3,2,3,2,3,2,3,2,3,2,3,2,3,2,1},
> + {7,6,5,4,3,5,4,3,2,3,2,3,2,1,0},
> + {5,7,6,5,4,3,4,3,2,3,2,1,1,0},
> + {3,7,5,4,6,5,4,3,3,2,2,1,0},
> + {5,4,3,7,6,5,4,3,2,1,1,0},
> + {1,1,7,6,5,4,3,2,1,1,0},
> + {1,1,5,4,3,3,2,1,1,0},
> + {1,1,1,3,3,2,2,1,0},
> + {1,0,1,3,2,1,1,1},
> + {1,0,1,3,2,1,1},
> + {0,1,1,2,1,3},
> + {0,1,1,1,1},
> + {0,1,1,1},
> + {0,1,1},
> + {0,1},
> +};
> +
> +static const uint8_t run_len[7][16] = {
> + {1,1},
> + {1,2,2},
> + {2,2,2,2},
> + {2,2,2,3,3},
> + {2,2,3,3,3,3},
> + {2,3,3,3,3,3,3},
> + {3,3,3,3,3,3,3,4,5,6,7,8,9,10,11},
> +};
> +
> +static const uint8_t run_bits[7][16] = {
> + {1,0},
> + {1,1,0},
> + {3,2,1,0},
> + {3,2,1,1,0},
> + {3,2,3,2,1,0},
> + {3,0,1,3,2,5,4},
> + {7,6,5,4,3,2,1,1,1,1,1,1,1,1,1},
> +};
> +
> +typedef struct MVec {
> + int x, y;
> +} MVec;
> +
> +typedef struct ActimagineContext {
> + AVFrame *cur_frame;
> + AVFrame *ref_frames[3];
> + int ref_frame_count;
> +
> + int version;
> + int quantizer;
> + int avi;
> +
> + GetBitContext gb;
> +
> + uint8_t *bitstream;
> + int bitstream_size;
> +
> + int qtab[2][4];
> +
> + uint8_t pred4_cache[5][5];
> +
> + MVec *vectors;
> + int vectors_stride;
> +
> + uint8_t *total_coeff_y;
> + int total_coeff_y_stride;
> +
> + uint8_t *total_coeff_uv;
> + int total_coeff_uv_stride;
> +
> + BswapDSPContext bdsp;
> +} ActimagineContext;
> +
> +static VLC coeff_token_vlc[4];
> +static VLC_TYPE coeff_token_vlc_tables[520+332+280+256][2];
> +static const int coeff_token_vlc_tables_size[4]={520,332,280,256};
> +
> +static VLC total_zeros_vlc[15+1];
> +static VLC_TYPE total_zeros_vlc_tables[15][512][2];
> +static const int total_zeros_vlc_tables_size = 512;
> +
> +static VLC run_vlc[6+1];
> +static VLC_TYPE run_vlc_tables[6][8][2];
> +static const int run_vlc_tables_size = 8;
> +
> +static VLC run7_vlc;
> +static VLC_TYPE run7_vlc_table[96][2];
> +static const int run7_vlc_table_size = 96;
> +
> +#define COEFF_TOKEN_VLC_BITS 8
> +#define TOTAL_ZEROS_VLC_BITS 9
> +#define RUN_VLC_BITS 3
> +#define RUN7_VLC_BITS 6
> +
> +#define PIXEL_REF(s, ref, plane, x, y)\
> + ((s)->ref_frames[(ref)]->data[(plane)]\
> + [(y) * (s)->ref_frames[(ref)]->linesize[(plane)] + (x)])
> +
> +#define PIXEL_CUR(s, plane, x, y)\
> + ((s)->cur_frame->data[(plane)]\
> + [(y) * (s)->cur_frame->linesize[(plane)] + (x)])
> +
> +#define PREDICT2(a,b) (((a) + (b) + 1) >> 1)
> +#define PREDICT3(a,b,c) (((a) + 2 * (b) + (c) + 2) >> 2)
> +
> +#define VX_VERSION_INVALID -1
> +#define VX_VERSION_OLD 0
> +#define VX_VERSION_NEW 1
> +
> +static av_cold void actimagine_init_static(void)
> +{
> + // all these tables are equal to the ones used for h264 cavlc
Then please share them.
> + int offset = 0;
> + for (int i = 0; i < 4; i++) {
> + coeff_token_vlc[i].table = coeff_token_vlc_tables + offset;
> + coeff_token_vlc[i].table_allocated = coeff_token_vlc_tables_size[i];
> + init_vlc(&coeff_token_vlc[i], COEFF_TOKEN_VLC_BITS, 4 * 17,
> + &coeff_token_len [i][0], 1, 1,
> + &coeff_token_bits[i][0], 1, 1,
> + INIT_VLC_USE_NEW_STATIC);
> + offset += coeff_token_vlc_tables_size[i];
> + }
> + /*
> + * This is a one time safety check to make sure that
> + * the packed static coeff_token_vlc table sizes
> + * were initialized correctly.
> + */
> + av_assert0(offset == FF_ARRAY_ELEMS(coeff_token_vlc_tables));
> +
> + for (int i = 0; i < 15; i++) {
> + total_zeros_vlc[i + 1].table = total_zeros_vlc_tables[i];
> + total_zeros_vlc[i + 1].table_allocated = total_zeros_vlc_tables_size;
> + init_vlc(&total_zeros_vlc[i + 1],
> + TOTAL_ZEROS_VLC_BITS, 16,
> + &total_zeros_len [i][0], 1, 1,
> + &total_zeros_bits[i][0], 1, 1,
> + INIT_VLC_USE_NEW_STATIC);
> + }
> +
> + for (int i = 0; i < 6; i++) {
> + run_vlc[i + 1].table = run_vlc_tables[i];
> + run_vlc[i + 1].table_allocated = run_vlc_tables_size;
> + init_vlc(&run_vlc[i + 1],
> + RUN_VLC_BITS, 7,
> + &run_len [i][0], 1, 1,
> + &run_bits[i][0], 1, 1,
> + INIT_VLC_USE_NEW_STATIC);
> + }
> +
> + run7_vlc.table = run7_vlc_table,
> + run7_vlc.table_allocated = run7_vlc_table_size;
> + init_vlc(&run7_vlc, RUN7_VLC_BITS, 16,
> + &run_len [6][0], 1, 1,
> + &run_bits[6][0], 1, 1,
> + INIT_VLC_USE_NEW_STATIC);
> +}
> +
> +static int setup_qtables(AVCodecContext *avctx, int quantizer)
> +{
> + int qx, qy;
> + ActimagineContext *s = avctx->priv_data;
> +
> + if (quantizer < 12 || quantizer > 161)
> + return AVERROR_INVALIDDATA;
> +
> + s->quantizer = quantizer;
> +
> + qx = quantizer % 6;
> + qy = quantizer / 6;
> +
> + for (int i = 0; i < 2; i++)
> + for (int j = 0; j < 4; j++)
> + s->qtab[i][j] = quant4x4_tab[qx][4 * i + j] << qy;
> +
> + return 0;
> +}
> +
> +static av_cold int actimagine_init(AVCodecContext *avctx)
> +{
> + int vectors_size;
> + int total_coeff_y_size;
> + int total_coeff_uv_size;
> + static AVOnce init_static_once = AV_ONCE_INIT;
> + ActimagineContext *s = avctx->priv_data;
> +
> + if (avctx->width & 15 || avctx->height & 15) {
> + av_log(avctx, AV_LOG_ERROR, "width/height not multiple of 16\n");
> + return AVERROR_INVALIDDATA;
> + }
> +
> + ff_bswapdsp_init(&s->bdsp);
> +
> + avctx->pix_fmt = AV_PIX_FMT_YUV420P;
> + avctx->color_range = AVCOL_RANGE_JPEG;
> + avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
> + // the color space of this video format is not supported currently
> + // it is a yuv approximation that can be converted back to rgb using
> bitshifts
> + // r = y + (v << 1)
> + // g = y - (u >> 1) - v
> + // b = y + (u << 1)
> + avctx->colorspace = AVCOL_SPC_NB;
> +
> + // predict4 cache
> + for (int i = 0; i < 5; i++)
> + for (int j = 0; j < 5; j++)
> + s->pred4_cache[i][j] = 9;
> +
> + // motion vector cache
> + s->vectors_stride = (avctx->width >> 4) + 2;
> + vectors_size = ((avctx->height >> 4) + 1) * s->vectors_stride;
> + s->vectors = av_calloc(vectors_size, sizeof(MVec));
> + if (!s->vectors)
> + return AVERROR(ENOMEM);
> + memset(s->vectors, 0, vectors_size * sizeof(MVec));
Unnecessary. av_calloc already zeroes it.
> +
> + // total dct coefficient cache for luma
> + s->total_coeff_y_stride = (avctx->width >> 2) + 1;
> + total_coeff_y_size = ((avctx->height >> 2) + 1) *
> s->total_coeff_y_stride;
> + s->total_coeff_y = av_malloc(total_coeff_y_size);
> + if (!s->total_coeff_y)
> + return AVERROR(ENOMEM);
> + memset(s->total_coeff_y, 0, total_coeff_y_size);
Unnecessary: Use av_mallocz.
> +
> + // total dct coefficient cache for chroma
> + s->total_coeff_uv_stride = (avctx->width >> 3) + 1;
> + total_coeff_uv_size = ((avctx->height >> 3) + 1) *
> s->total_coeff_uv_stride;
> + s->total_coeff_uv = av_malloc(total_coeff_uv_size);
> + if (!s->total_coeff_uv)
> + return AVERROR(ENOMEM);
> + memset(s->total_coeff_uv, 0, total_coeff_uv_size);
Same as above.
> +
> + s->ref_frame_count = 0;
> + for (int i = 0; i < 3; i++) {
> + s->ref_frames[i] = av_frame_alloc();
> + if (!s->ref_frames[i])
> + return AVERROR(ENOMEM);
> + }
> + s->cur_frame = av_frame_alloc();
> + if (!s->cur_frame)
> + return AVERROR(ENOMEM);
> +
> + s->version = VX_VERSION_INVALID;
> + s->quantizer = -1;
> + s->avi = 0;
> +
> + // when the source is an avi file, the quantizer is stored in the
> extradata
> + if (avctx->extradata_size == 4)
> + if (!setup_qtables(avctx, AV_RL32(avctx->extradata)))
> + s->avi = 1;
> +
> + ff_thread_once(&init_static_once, actimagine_init_static);
> +
> + return 0;
> +}
> +
> +static void clear_total_coeff(AVCodecContext *avctx, int x, int y, int w,
> int h)
> +{
> + ActimagineContext *s = avctx->priv_data;
> +
> + // luma
> + uint8_t *total_coeff = &s->total_coeff_y[
> + ((y >> 2) + 1) * s->total_coeff_y_stride + (x >> 2) + 1];
> +
> + for (int y2 = 0; y2 < (h >> 2); y2++)
> + for (int x2 = 0; x2 < (w >> 2); x2++)
> + total_coeff[y2 * s->total_coeff_y_stride + x2] = 0;
> +
> + // chroma
> + total_coeff = &s->total_coeff_uv[
> + ((y >> 3) + 1) * s->total_coeff_uv_stride + (x >> 3) + 1];
> +
> + for (int y2 = 0; y2 < (h >> 3); y2++)
> + for (int x2 = 0; x2 < (w >> 3); x2++)
> + total_coeff[y2 * s->total_coeff_uv_stride + x2] = 0;
> +}
> +
> +static void predict_plane_intern(AVCodecContext *avctx, int x, int y,
> + int w, int h, int plane)
> +{
> + ActimagineContext *s = avctx->priv_data;
> + if (w == 1 && h == 1)
> + return;
> + if (w == 1 && h != 1) {
> + uint8_t top = PIXEL_CUR(s, plane, x, y - 1);
> + uint8_t bottom = PIXEL_CUR(s, plane, x, y + h - 1);
> + PIXEL_CUR(s, plane, x, y + (h >> 1) - 1) = (top + bottom) >> 1;
> + predict_plane_intern(avctx, x, y, 1, h >> 1, plane);
> + predict_plane_intern(avctx, x, y + (h >> 1), 1, h >> 1, plane);
> + } else if (w != 1 && h == 1) {
> + uint8_t left = PIXEL_CUR(s, plane, x - 1, y);
> + uint8_t right = PIXEL_CUR(s, plane, x + w - 1, y);
> + PIXEL_CUR(s, plane, x + (w >> 1) - 1, y) = (left + right) >> 1;
> + predict_plane_intern(avctx, x, y, w >> 1, 1, plane);
> + predict_plane_intern(avctx, x + (w >> 1), y, w >> 1, 1, plane);
> + } else {
> + uint8_t bottom_left = PIXEL_CUR(s, plane, x - 1, y + h - 1);
> + uint8_t top_right = PIXEL_CUR(s, plane, x + w - 1, y - 1);
> + uint8_t bottom_right = PIXEL_CUR(s, plane, x + w - 1, y + h - 1);
> + uint8_t bottom_center = (bottom_left + bottom_right) >> 1;
> + uint8_t center_right = (top_right + bottom_right) >> 1;
> + PIXEL_CUR(s, plane, x + (w >> 1) - 1, y + h - 1) = bottom_center;
> + PIXEL_CUR(s, plane, x + w - 1, y + (h >> 1) - 1) = center_right;
> + if ((w == 4 || w == 16) ^ (h == 4 || h == 16)) {
> + uint8_t center_left = PIXEL_CUR(s, plane, x - 1, y + (h >> 1) -
> 1);
> + PIXEL_CUR(s, plane, x + (w >> 1) - 1, y + (h >> 1) - 1)
> + = (center_left + center_right) >> 1;
> + } else {
> + uint8_t top_center = PIXEL_CUR(s, plane, x + (w >> 1) - 1, y -
> 1);
> + PIXEL_CUR(s, plane, x + (w >> 1) - 1, y + (h >> 1) - 1)
> + = (top_center + bottom_center) >> 1;
> + }
> + predict_plane_intern(avctx, x, y, w >> 1, h >> 1, plane);
> + predict_plane_intern(avctx, x + (w >> 1), y, w >> 1, h >> 1, plane);
> + predict_plane_intern(avctx, x, y + (h >> 1), w >> 1, h >> 1, plane);
> + predict_plane_intern(avctx, x + (w >> 1), y + (h >> 1), w >> 1, h >>
> 1,
> + plane);
> + }
> +}
> +
> +static void predict_plane(AVCodecContext *avctx, int x, int y, int w, int h,
> + int plane, int param)
> +{
> + ActimagineContext *s = avctx->priv_data;
> + uint8_t bottom_left = PIXEL_CUR(s, plane, x - 1, y + h - 1);
> + uint8_t top_right = PIXEL_CUR(s, plane, x + w - 1, y - 1);
> + PIXEL_CUR(s, plane, x + w - 1, y + h - 1)
> + = ((bottom_left + top_right + 1) >> 1) + param;
> + predict_plane_intern(avctx, x, y, w, h, plane);
> +}
> +
> +static int predict_mb_plane(AVCodecContext *avctx, int x, int y, int w, int
> h)
> +{
> + ActimagineContext *s = avctx->priv_data;
> + GetBitContext *gb = &s->gb;
> + // y
> + int param = get_se_golomb(gb);
> + if (param < -(1 << 16) || param >= (1 << 16)) {
> + av_log(avctx, AV_LOG_ERROR, "invalid plane param\n");
> + return AVERROR_INVALIDDATA;
> + }
> + predict_plane(avctx, x, y, w, h, 0, param << 1);
> +
> + // u
> + param = get_se_golomb(gb);
> + if (param < -(1 << 16) || param >= (1 << 16)) {
> + av_log(avctx, AV_LOG_ERROR, "invalid plane param\n");
> + return AVERROR_INVALIDDATA;
> + }
> + predict_plane(avctx, x >> 1, y >> 1, w >> 1, h >> 1, 1, param << 1);
> +
> + // v
> + param = get_se_golomb(gb);
> + if (param < -(1 << 16) || param >= (1 << 16)) {
> + av_log(avctx, AV_LOG_ERROR, "invalid plane param\n");
> + return AVERROR_INVALIDDATA;
> + }
> + predict_plane(avctx, x >> 1, y >> 1, w >> 1, h >> 1, 2, param << 1);
> +
> + return 0;
> +}
> +
> +static void predict_horizontal(AVCodecContext *avctx, int x, int y,
> + int w, int h, int plane)
> +{
> + ActimagineContext *s = avctx->priv_data;
> + for (int y2 = 0; y2 < h; y2++) {
> + uint8_t pixel = PIXEL_CUR(s, plane, x - 1, y + y2);
> + for (int x2 = 0; x2 < w; x2++)
> + PIXEL_CUR(s, plane, x + x2, y + y2) = pixel;
> + }
> +}
> +
> +static void predict_vertical(AVCodecContext *avctx, int x, int y,
> + int w, int h, int plane)
> +{
> + ActimagineContext *s = avctx->priv_data;
> + for (int y2 = 0; y2 < h; y2++)
> + for (int x2 = 0; x2 < w; x2++)
> + PIXEL_CUR(s, plane, x + x2, y + y2)
> + = PIXEL_CUR(s, plane, x + x2, y - 1);
> +}
> +
> +static void predict_dc(AVCodecContext *avctx, int x, int y, int w, int h,
> + int plane)
> +{
> + uint8_t dc;
> + ActimagineContext *s = avctx->priv_data;
> + if (x != 0 && y != 0) {
> + int sum_h, sum_v;
> + sum_h = w >> 1;
> + for (int x2 = 0; x2 < w; x2++)
> + sum_h += PIXEL_CUR(s, plane, x + x2, y - 1);
> + sum_h >>= predict_dc_shift_tab[w >> 2];
> +
> + sum_v = h >> 1;
> + for (int y2 = 0; y2 < h; y2++)
> + sum_v += PIXEL_CUR(s, plane, x - 1, y + y2);
> + sum_v >>= predict_dc_shift_tab[h >> 2];
> +
> + dc = (sum_h + sum_v + 1) >> 1;
> + } else if (x == 0 && y != 0) {
> + int sum = w >> 1;
> + for (int x2 = 0; x2 < w; x2++)
> + sum += PIXEL_CUR(s, plane, x + x2, y - 1);
> + dc = sum >> predict_dc_shift_tab[w >> 2];
> + } else if (x != 0 && y == 0) {
> + int sum = h >> 1;
> + for (int y2 = 0; y2 < h; y2++)
> + sum += PIXEL_CUR(s, plane, x - 1, y + y2);
> + dc = sum >> predict_dc_shift_tab[h >> 2];
> + } else
> + dc = 128;
> +
> + for (int y2 = 0; y2 < h; y2++)
> + for (int x2 = 0; x2 < w; x2++)
> + PIXEL_CUR(s, plane, x + x2, y + y2) = dc;
> +}
> +
> +static int predict_notile_uv(AVCodecContext *avctx, int x, int y, int w, int
> h)
> +{
> + ActimagineContext *s = avctx->priv_data;
> + GetBitContext *gb = &s->gb;
> + int mode_uv = get_ue_golomb_31(gb);
> + switch (mode_uv) {
> + case 0:// dc
> + predict_dc(avctx, x >> 1, y >> 1, w >> 1, h >> 1, 1);
> + predict_dc(avctx, x >> 1, y >> 1, w >> 1, h >> 1, 2);
> + break;
> + case 1:// horizontal
> + predict_horizontal(avctx, x >> 1, y >> 1, w >> 1, h >> 1, 1);
> + predict_horizontal(avctx, x >> 1, y >> 1, w >> 1, h >> 1, 2);
> + break;
> + case 2:// vertical
> + predict_vertical(avctx, x >> 1, y >> 1, w >> 1, h >> 1, 1);
> + predict_vertical(avctx, x >> 1, y >> 1, w >> 1, h >> 1, 2);
> + break;
> + case 3:// plane
> + predict_plane(avctx, x >> 1, y >> 1, w >> 1, h >> 1, 1, 0);
> + predict_plane(avctx, x >> 1, y >> 1, w >> 1, h >> 1, 2, 0);
> + break;
> + default:
> + av_log(avctx, AV_LOG_ERROR, "invalid predict notile uv mode\n");
> + return AVERROR_INVALIDDATA;
> + }
> + return 0;
> +}
> +
> +static int predict_notile(AVCodecContext *avctx, int x, int y, int w, int h)
> +{
> + ActimagineContext *s = avctx->priv_data;
> + GetBitContext *gb = &s->gb;
> + int mode_y = get_ue_golomb_31(gb);
> + switch (mode_y) {
> + case 0:// vertical
> + predict_vertical(avctx, x, y, w, h, 0);
> + break;
> + case 1:// horizontal
> + predict_horizontal(avctx, x, y, w, h, 0);
> + break;
> + case 2:// dc
> + predict_dc(avctx, x, y, w, h, 0);
> + break;
> + case 3:// plane
> + predict_plane(avctx, x, y, w, h, 0, 0);
> + break;
> + default:
> + av_log(avctx, AV_LOG_ERROR, "invalid predict notile y mode\n");
> + return AVERROR_INVALIDDATA;
> + }
> + return predict_notile_uv(avctx, x, y, w, h);
> +}
> +
> +// slightly different from the common dc prediction method
> +static void predict4_dc(AVCodecContext *avctx, int x, int y)
> +{
> + uint8_t dc;
> + ActimagineContext *s = avctx->priv_data;
> + if (x == 0 && y == 0)
> + dc = 128;
> + else {
> + int sum = 0;
> + int shift = 1;
> +
> + if (x != 0) {
> + shift++;
> + for (int y2 = 0; y2 < 4; y2++)
> + sum += PIXEL_CUR(s, 0, x - 1, y + y2);
> + sum += 2;
> + }
> +
> + if (y != 0) {
> + shift++;
> + for (int x2 = 0; x2 < 4; x2++)
> + sum += PIXEL_CUR(s, 0, x + x2, y - 1);
> + sum += 2;
> + }
> +
> + dc = sum >> shift;
> + }
> +
> + for (int y2 = 0; y2 < 4; y2++)
> + for (int x2 = 0; x2 < 4; x2++)
> + PIXEL_CUR(s, 0, x + x2, y + y2) = dc;
> +}
> +
> +static void predict4_diagonal_down_left(AVCodecContext *avctx, int x, int y)
> +{
> + uint8_t val;
> + ActimagineContext *s = avctx->priv_data;
> +
> + uint8_t a = PIXEL_CUR(s, 0, x + 0, y - 1);
> + uint8_t b = PIXEL_CUR(s, 0, x + 1, y - 1);
> + uint8_t c = PIXEL_CUR(s, 0, x + 2, y - 1);
> + uint8_t d = PIXEL_CUR(s, 0, x + 3, y - 1);
> + uint8_t e = PIXEL_CUR(s, 0, x + 4, y - 1);
> + uint8_t f = PIXEL_CUR(s, 0, x + 5, y - 1);
> + uint8_t g = PIXEL_CUR(s, 0, x + 6, y - 1);
> + uint8_t h = PIXEL_CUR(s, 0, x + 7, y - 1);
> +
> + PIXEL_CUR(s, 0, x, y) = PREDICT3(a, b, c);
> +
> + val = PREDICT3(b, c, d);
> + PIXEL_CUR(s, 0, x + 1, y + 0) = val;
> + PIXEL_CUR(s, 0, x + 0, y + 1) = val;
> +
> + val = PREDICT3(c, d, e);
> + PIXEL_CUR(s, 0, x + 2, y + 0) = val;
> + PIXEL_CUR(s, 0, x + 1, y + 1) = val;
> + PIXEL_CUR(s, 0, x + 0, y + 2) = val;
> +
> + val = PREDICT3(d, e, f);
> + PIXEL_CUR(s, 0, x + 3, y + 0) = val;
> + PIXEL_CUR(s, 0, x + 2, y + 1) = val;
> + PIXEL_CUR(s, 0, x + 1, y + 2) = val;
> + PIXEL_CUR(s, 0, x + 0, y + 3) = val;
> +
> + val = PREDICT3(e, f, g);
> + PIXEL_CUR(s, 0, x + 3, y + 1) = val;
> + PIXEL_CUR(s, 0, x + 2, y + 2) = val;
> + PIXEL_CUR(s, 0, x + 1, y + 3) = val;
> +
> + val = PREDICT3(f, g, h);
> + PIXEL_CUR(s, 0, x + 3, y + 2) = val;
> + PIXEL_CUR(s, 0, x + 2, y + 3) = val;
> +
> + PIXEL_CUR(s, 0, x + 3, y + 3) = PREDICT3(g, h, h);
> +}
> +
> +static void predict4_diagonal_down_right(AVCodecContext *avctx, int x, int y)
> +{
> + uint8_t val;
> + ActimagineContext *s = avctx->priv_data;
> +
> + uint8_t a = PIXEL_CUR(s, 0, x + 0, y - 1);
> + uint8_t b = PIXEL_CUR(s, 0, x + 1, y - 1);
> + uint8_t c = PIXEL_CUR(s, 0, x + 2, y - 1);
> + uint8_t d = PIXEL_CUR(s, 0, x + 3, y - 1);
> +
> + uint8_t i = PIXEL_CUR(s, 0, x - 1, y + 0);
> + uint8_t j = PIXEL_CUR(s, 0, x - 1, y + 1);
> + uint8_t k = PIXEL_CUR(s, 0, x - 1, y + 2);
> + uint8_t l = PIXEL_CUR(s, 0, x - 1, y + 3);
> +
> + uint8_t m = PIXEL_CUR(s, 0, x - 1, y - 1);
> +
> + PIXEL_CUR(s, 0, x + 0, y + 3) = PREDICT3(j, k, l);
> +
> + val = PREDICT3(i, j, k);
> + PIXEL_CUR(s, 0, x + 0, y + 2) = val;
> + PIXEL_CUR(s, 0, x + 1, y + 3) = val;
> +
> + val = PREDICT3(m, i, j);
> + PIXEL_CUR(s, 0, x + 0, y + 1) = val;
> + PIXEL_CUR(s, 0, x + 1, y + 2) = val;
> + PIXEL_CUR(s, 0, x + 2, y + 3) = val;
> +
> + val = PREDICT3(i, m, a);
> + PIXEL_CUR(s, 0, x + 0, y + 0) = val;
> + PIXEL_CUR(s, 0, x + 1, y + 1) = val;
> + PIXEL_CUR(s, 0, x + 2, y + 2) = val;
> + PIXEL_CUR(s, 0, x + 3, y + 3) = val;
> +
> + val = PREDICT3(m, a, b);
> + PIXEL_CUR(s, 0, x + 1, y + 0) = val;
> + PIXEL_CUR(s, 0, x + 2, y + 1) = val;
> + PIXEL_CUR(s, 0, x + 3, y + 2) = val;
> +
> + val = PREDICT3(a, b, c);
> + PIXEL_CUR(s, 0, x + 2, y + 0) = val;
> + PIXEL_CUR(s, 0, x + 3, y + 1) = val;
> +
> + PIXEL_CUR(s, 0, x + 3, y + 0) = PREDICT3(b, c, d);
> +}
> +
> +static void predict4_vertical_right(AVCodecContext *avctx, int x, int y)
> +{
> + uint8_t val;
> + ActimagineContext *s = avctx->priv_data;
> +
> + uint8_t a = PIXEL_CUR(s, 0, x + 0, y - 1);
> + uint8_t b = PIXEL_CUR(s, 0, x + 1, y - 1);
> + uint8_t c = PIXEL_CUR(s, 0, x + 2, y - 1);
> + uint8_t d = PIXEL_CUR(s, 0, x + 3, y - 1);
> +
> + uint8_t i = PIXEL_CUR(s, 0, x - 1, y + 0);
> + uint8_t j = PIXEL_CUR(s, 0, x - 1, y + 1);
> + uint8_t k = PIXEL_CUR(s, 0, x - 1, y + 2);
> +
> + uint8_t m = PIXEL_CUR(s, 0, x - 1, y - 1);
> +
> + PIXEL_CUR(s, 0, x + 0, y + 3) = PREDICT3(i, j, k);
> + PIXEL_CUR(s, 0, x + 0, y + 2) = PREDICT3(m, i, j);
> +
> + val = PREDICT3(a, m, i);
> + PIXEL_CUR(s, 0, x + 0, y + 1) = val;
> + PIXEL_CUR(s, 0, x + 1, y + 3) = val;
> +
> + val = PREDICT2(a, m);
> + PIXEL_CUR(s, 0, x + 0, y + 0) = val;
> + PIXEL_CUR(s, 0, x + 1, y + 2) = val;
> +
> + val = PREDICT3(b, a, m);
> + PIXEL_CUR(s, 0, x + 1, y + 1) = val;
> + PIXEL_CUR(s, 0, x + 2, y + 3) = val;
> +
> + val = PREDICT2(b, a);
> + PIXEL_CUR(s, 0, x + 1, y + 0) = val;
> + PIXEL_CUR(s, 0, x + 2, y + 2) = val;
> +
> + val = PREDICT3(c, b, a);
> + PIXEL_CUR(s, 0, x + 2, y + 1) = val;
> + PIXEL_CUR(s, 0, x + 3, y + 3) = val;
> +
> + val = PREDICT2(c, b);
> + PIXEL_CUR(s, 0, x + 2, y + 0) = val;
> + PIXEL_CUR(s, 0, x + 3, y + 2) = val;
> +
> + PIXEL_CUR(s, 0, x + 3, y + 1) = PREDICT3(d, c, b);
> + PIXEL_CUR(s, 0, x + 3, y + 0) = PREDICT2(d, c);
> +}
> +
> +static void predict4_horizontal_down(AVCodecContext *avctx, int x, int y)
> +{
> + uint8_t val;
> + ActimagineContext *s = avctx->priv_data;
> +
> + uint8_t a = PIXEL_CUR(s, 0, x + 0, y - 1);
> + uint8_t b = PIXEL_CUR(s, 0, x + 1, y - 1);
> + uint8_t c = PIXEL_CUR(s, 0, x + 2, y - 1);
> +
> + uint8_t i = PIXEL_CUR(s, 0, x - 1, y + 0);
> + uint8_t j = PIXEL_CUR(s, 0, x - 1, y + 1);
> + uint8_t k = PIXEL_CUR(s, 0, x - 1, y + 2);
> + uint8_t l = PIXEL_CUR(s, 0, x - 1, y + 3);
> +
> + uint8_t m = PIXEL_CUR(s, 0, x - 1, y - 1);
> +
> + PIXEL_CUR(s, 0, x + 0, y + 3) = PREDICT2(k, l);
> + PIXEL_CUR(s, 0, x + 1, y + 3) = PREDICT3(j, k, l);
> +
> + val = PREDICT2(j, k);
> + PIXEL_CUR(s, 0, x + 0, y + 2) = val;
> + PIXEL_CUR(s, 0, x + 2, y + 3) = val;
> +
> + val = PREDICT3(i, j, k);
> + PIXEL_CUR(s, 0, x + 1, y + 2) = val;
> + PIXEL_CUR(s, 0, x + 3, y + 3) = val;
> +
> + val = PREDICT2(i, j);
> + PIXEL_CUR(s, 0, x + 0, y + 1) = val;
> + PIXEL_CUR(s, 0, x + 2, y + 2) = val;
> +
> + val = PREDICT3(m, i, j);
> + PIXEL_CUR(s, 0, x + 1, y + 1) = val;
> + PIXEL_CUR(s, 0, x + 3, y + 2) = val;
> +
> + val = PREDICT2(i, m);
> + PIXEL_CUR(s, 0, x + 0, y + 0) = val;
> + PIXEL_CUR(s, 0, x + 2, y + 1) = val;
> +
> + val = PREDICT3(i, m, a);
> + PIXEL_CUR(s, 0, x + 1, y + 0) = val;
> + PIXEL_CUR(s, 0, x + 3, y + 1) = val;
> +
> + PIXEL_CUR(s, 0, x + 2, y + 0) = PREDICT3(m, a, b);
> + PIXEL_CUR(s, 0, x + 3, y + 0) = PREDICT3(a, b, c);
> +}
> +
> +static void predict4_vertical_left(AVCodecContext *avctx, int x, int y)
> +{
> + uint8_t val;
> + ActimagineContext *s = avctx->priv_data;
> +
> + uint8_t a = PIXEL_CUR(s, 0, x + 0, y - 1);
> + uint8_t b = PIXEL_CUR(s, 0, x + 1, y - 1);
> + uint8_t c = PIXEL_CUR(s, 0, x + 2, y - 1);
> + uint8_t d = PIXEL_CUR(s, 0, x + 3, y - 1);
> + uint8_t e = PIXEL_CUR(s, 0, x + 4, y - 1);
> + uint8_t f = PIXEL_CUR(s, 0, x + 5, y - 1);
> + uint8_t g = PIXEL_CUR(s, 0, x + 6, y - 1);
> +
> + PIXEL_CUR(s, 0, x + 3, y + 3) = PREDICT3(e, f, g);
> + PIXEL_CUR(s, 0, x + 3, y + 2) = PREDICT2(e, f);
> +
> + val = PREDICT3(d, e, f);
> + PIXEL_CUR(s, 0, x + 3, y + 1) = val;
> + PIXEL_CUR(s, 0, x + 2, y + 3) = val;
> +
> + val = PREDICT2(d, e);
> + PIXEL_CUR(s, 0, x + 3, y + 0) = val;
> + PIXEL_CUR(s, 0, x + 2, y + 2) = val;
> +
> + val = PREDICT3(c, d, e);
> + PIXEL_CUR(s, 0, x + 2, y + 1) = val;
> + PIXEL_CUR(s, 0, x + 1, y + 3) = val;
> +
> + val = PREDICT2(c, d);
> + PIXEL_CUR(s, 0, x + 2, y + 0) = val;
> + PIXEL_CUR(s, 0, x + 1, y + 2) = val;
> +
> + val = PREDICT3(b, c, d);
> + PIXEL_CUR(s, 0, x + 1, y + 1) = val;
> + PIXEL_CUR(s, 0, x + 0, y + 3) = val;
> +
> + val = PREDICT2(b, c);
> + PIXEL_CUR(s, 0, x + 1, y + 0) = val;
> + PIXEL_CUR(s, 0, x + 0, y + 2) = val;
> +
> + PIXEL_CUR(s, 0, x + 0, y + 1) = PREDICT3(a, b, c);
> + PIXEL_CUR(s, 0, x + 0, y + 0) = PREDICT2(a, b);
> +}
> +
> +static void predict4_horizontal_up(AVCodecContext *avctx, int x, int y)
> +{
> + ActimagineContext *s = avctx->priv_data;
> +
> + uint8_t i = PIXEL_CUR(s, 0, x - 1, y + 0);
> + uint8_t j = PIXEL_CUR(s, 0, x - 1, y + 1);
> + uint8_t k = PIXEL_CUR(s, 0, x - 1, y + 2);
> + uint8_t l = PIXEL_CUR(s, 0, x - 1, y + 3);
> +
> + PIXEL_CUR(s, 0, x + 0, y + 0) = PREDICT2(i, j);
> + PIXEL_CUR(s, 0, x + 1, y + 0) = PREDICT3(i, j, k);
> + PIXEL_CUR(s, 0, x + 2, y + 0) = PREDICT2(j, k);
> + PIXEL_CUR(s, 0, x + 3, y + 0) = PREDICT3(j, k, l);
> +
> + PIXEL_CUR(s, 0, x + 0, y + 1) = PREDICT2(j, k);
> + PIXEL_CUR(s, 0, x + 1, y + 1) = PREDICT3(j, k, l);
> + PIXEL_CUR(s, 0, x + 2, y + 1) = PREDICT2(k, l);
> + PIXEL_CUR(s, 0, x + 3, y + 1) = PREDICT3(k, l, l);
> +
> + PIXEL_CUR(s, 0, x + 0, y + 2) = PREDICT2(k, l);
> + PIXEL_CUR(s, 0, x + 1, y + 2) = PREDICT3(k, l, l);
> + PIXEL_CUR(s, 0, x + 2, y + 2) = l;
> + PIXEL_CUR(s, 0, x + 3, y + 2) = l;
> +
> + PIXEL_CUR(s, 0, x + 0, y + 3) = l;
> + PIXEL_CUR(s, 0, x + 1, y + 3) = l;
> + PIXEL_CUR(s, 0, x + 2, y + 3) = l;
> + PIXEL_CUR(s, 0, x + 3, y + 3) = l;
> +}
> +
> +static int predict4(AVCodecContext *avctx, int x, int y, int w, int h)
> +{
> + ActimagineContext *s = avctx->priv_data;
> + GetBitContext *gb = &s->gb;
> + for (int y2 = 0; y2 < h >> 2; y2++) {
> + for (int x2 = 0; x2 < w >> 2; x2++) {
> + uint8_t mode = FFMIN(s->pred4_cache[1 + y2 - 1][1 + x2],
> + s->pred4_cache[1 + y2][1 + x2 - 1]);
> + if (mode == 9)// if invalid predict dc
> + mode = 2;
> +
> + if (!get_bits1(gb)) {
> + uint8_t val = get_bits(gb, 3);
> + if (val >= mode)
> + val++;
> + mode = val;
> + }
> +
> + s->pred4_cache[1 + y2][1 + x2] = mode;
> +
> + switch (mode) {
> + case 0:// vertical
> + predict_vertical(avctx, x + x2 * 4, y + y2 * 4, 4, 4, 0);
> + break;
> + case 1:// horizontal
> + predict_horizontal(avctx, x + x2 * 4, y + y2 * 4, 4, 4, 0);
> + break;
> + case 2:// dc
> + predict4_dc(avctx, x + x2 * 4, y + y2 * 4);
> + break;
> + case 3:// diagonal-down-left
> + predict4_diagonal_down_left(avctx, x + x2 * 4, y + y2 * 4);
> + break;
> + case 4:// diagonal-down-right
> + predict4_diagonal_down_right(avctx, x + x2 * 4, y + y2 * 4);
> + break;
> + case 5:// vertical-right
> + predict4_vertical_right(avctx, x + x2 * 4, y + y2 * 4);
> + break;
> + case 6:// horizontal-down
> + predict4_horizontal_down(avctx, x + x2 * 4, y + y2 * 4);
> + break;
> + case 7:// vertical-left
> + predict4_vertical_left(avctx, x + x2 * 4, y + y2 * 4);
> + break;
> + case 8:// horizontal-up
> + predict4_horizontal_up(avctx, x + x2 * 4, y + y2 * 4);
> + break;
> + default:
> + av_log(avctx, AV_LOG_ERROR, "invalid predict4 mode\n");
> + return AVERROR_INVALIDDATA;
> + }
> + }
> + }
> + return predict_notile_uv(avctx, x, y, w, h);
> +}
> +
> +static void decode_dct(AVCodecContext *avctx, int x, int y, int plane,
> + const int* level)
> +{
> + int a, b, c, d, e, f;
> + int dct[16];
> + int tmp[16];
> + ActimagineContext *s = avctx->priv_data;
> +
> + // dezigzag
> + for (int i = 0; i < 16; i++)
> + dct[zigzag4x4_tab[i]] = level[i];
> +
> + // dequantize
> + for (int i = 0; i < 2; i++) {
> + for (int j = 0; j < 4; j++) {
> + dct[4 * j + i] *= s->qtab[i][j];
> + dct[4 * j + i + 2] *= s->qtab[i][j];
> + }
> + }
> +
> + dct[0] += 32;// rounding
> +
> + for (int i = 0; i < 4; i++) {
> + a = dct[i * 4 + 0];
> + b = dct[i * 4 + 1];
> + c = dct[i * 4 + 2];
> + d = dct[i * 4 + 3];
> + a += c;
> + c = a - c * 2;
> + e = (b >> 1) - d;
> + f = b + (d >> 1);
> + tmp[ 0 + i] = a + f;
> + tmp[ 4 + i] = c + e;
> + tmp[ 8 + i] = c - e;
> + tmp[12 + i] = a - f;
> + }
> +
> + for (int i = 0; i < 4; i++) {
> + a = tmp[i * 4 + 0];
> + b = tmp[i * 4 + 1];
> + c = tmp[i * 4 + 2];
> + d = tmp[i * 4 + 3];
> + a += c;
> + c = a - c * 2;
> + e = (b >> 1) - d;
> + f = b + (d >> 1);
> + PIXEL_CUR(s, plane, x + 0, y + i)
> + = av_clip_uint8(PIXEL_CUR(s, plane, x + 0, y + i) + ((a + f) >>
> 6));
> + PIXEL_CUR(s, plane, x + 1, y + i)
> + = av_clip_uint8(PIXEL_CUR(s, plane, x + 1, y + i) + ((c + e) >>
> 6));
> + PIXEL_CUR(s, plane, x + 2, y + i)
> + = av_clip_uint8(PIXEL_CUR(s, plane, x + 2, y + i) + ((c - e) >>
> 6));
> + PIXEL_CUR(s, plane, x + 3, y + i)
> + = av_clip_uint8(PIXEL_CUR(s, plane, x + 3, y + i) + ((a - f) >>
> 6));
> + }
> +}
> +
> +static void decode_residu_cavlc(AVCodecContext *avctx, int x, int y, int
> plane,
> + int nc, uint8_t *out_total_coeff)
> +{
> + int level[16];
> + int coeff_token, total_coeff, trailing_ones, i, zeros_left,
> suffix_length;
> + ActimagineContext *s = avctx->priv_data;
> + GetBitContext *gb = &s->gb;
> +
> + coeff_token = get_vlc2(gb,
> coeff_token_vlc[coeff_token_table_index[nc]].table,
> + COEFF_TOKEN_VLC_BITS, 2);
> + trailing_ones = coeff_token & 3;
> + total_coeff = coeff_token >> 2;
> +
> + *out_total_coeff = total_coeff;
> + if (total_coeff == 0)
> + return;
> +
> + av_assert2(total_coeff <= 16);
> +
> + i = 15;
> + if (total_coeff != 16) {
> + int trailing_zeros;
> + zeros_left = get_vlc2(gb, total_zeros_vlc[total_coeff].table,
> + TOTAL_ZEROS_VLC_BITS, 1);
> + trailing_zeros = 16 - (total_coeff + zeros_left);
> + while(trailing_zeros-- > 0)
> + level[i--] = 0;
> + } else
> + zeros_left = 0;
> +
> + suffix_length = 0;
> + while (1) {
> + int level_suffix, level_code, run_before;
> + if (trailing_ones > 0) {
> + trailing_ones--;
> + level[i--] = get_bits1(gb) ? -1 : 1;
> + } else {
> + int level_prefix = 0;
> + while (!get_bits1(gb))
> + level_prefix++;
> +
> + if (level_prefix == 15)
> + level_suffix = get_bits(gb, 11);
> + else
> + level_suffix = suffix_length == 0 ? 0 : get_bits(gb,
> suffix_length);
> +
> + level_code = level_suffix + (level_prefix << suffix_length);
> +
> + if (level_code > cavlc_suffix_len_update_tab[suffix_length])
> + suffix_length++;
> +
> + level_code++;
> + if (get_bits1(gb))
> + level_code = -level_code;
> + level[i--] = level_code;
> + }
> +
> + if (--total_coeff == 0)
> + break;
> +
> + if (zeros_left == 0)
> + continue;
> +
> + if(zeros_left < 7)
> + run_before = get_vlc2(gb, run_vlc[zeros_left].table,
> RUN_VLC_BITS, 1);
> + else
> + run_before = get_vlc2(gb, run7_vlc.table, RUN7_VLC_BITS, 2);
> + zeros_left -= run_before;
> + while(run_before-- > 0)
> + level[i--] = 0;
> + }
> +
> + while(zeros_left-- > 0)
> + level[i--] = 0;
> +
> + decode_dct(avctx, x, y, plane, level);
> +}
> +
> +static int decode_residu_blocks(AVCodecContext *avctx, int x, int y,
> + int w, int h)
> +{
> + ActimagineContext *s = avctx->priv_data;
> + GetBitContext *gb = &s->gb;
> + uint8_t *total_coeff_y = &s->total_coeff_y[
> + ((y >> 2) + 1) * s->total_coeff_y_stride + (x >> 2) + 1];
> + uint8_t *total_coeff_uv = &s->total_coeff_uv[
> + ((y >> 3) + 1) * s->total_coeff_uv_stride + (x >> 3) + 1];
> + for (int y2 = 0; y2 < h >> 3; y2++) {
> + for (int x2 = 0; x2 < w >> 3; x2++) {
> + uint8_t residu_mask;
> + int code = get_ue_golomb_31(gb);
> + if (code > 0x1F) {
> + av_log(avctx, AV_LOG_ERROR, "invalid residu mask code\n");
> + return AVERROR_INVALIDDATA;
> + }
> + if (s->version == VX_VERSION_OLD)
> + residu_mask = residu_mask_old_tab[code];
> + else
> + residu_mask = residu_mask_new_tab[code];
> +
> + if (residu_mask & 1) {
> + int nc = (total_coeff_y[-1] +
> + total_coeff_y[-s->total_coeff_y_stride] + 1) >> 1;
> + decode_residu_cavlc(avctx, x + x2 * 8, y + y2 * 8, 0, nc,
> + &total_coeff_y[0]);
> + } else
> + total_coeff_y[0] = 0;
> +
> + if (residu_mask & 2) {
> + int nc = (total_coeff_y[0] +
> + total_coeff_y[-s->total_coeff_y_stride + 1] + 1)
> >> 1;
> + decode_residu_cavlc(avctx, x + x2 * 8 + 4, y + y2 * 8, 0, nc,
> + &total_coeff_y[1]);
> + } else
> + total_coeff_y[1] = 0;
> +
> + if (residu_mask & 4) {
> + int nc = (total_coeff_y[s->total_coeff_y_stride - 1] +
> + total_coeff_y[0] + 1) >> 1;
> + decode_residu_cavlc(avctx, x + x2 * 8, y + y2 * 8 + 4, 0, nc,
> + &total_coeff_y[s->total_coeff_y_stride]);
> + } else
> + total_coeff_y[s->total_coeff_y_stride] = 0;
> +
> + if (residu_mask & 8) {
> + int nc = (total_coeff_y[s->total_coeff_y_stride] +
> + total_coeff_y[1] + 1) >> 1;
> + decode_residu_cavlc(
> + avctx, x + x2 * 8 + 4, y + y2 * 8 + 4, 0, nc,
> + &total_coeff_y[s->total_coeff_y_stride + 1]);
> + } else
> + total_coeff_y[s->total_coeff_y_stride + 1] = 0;
> +
> + if (residu_mask & 16) {
> + uint8_t total_coeff_u, total_coeff_v;
> + int nc = (total_coeff_uv[-1] +
> + total_coeff_uv[-s->total_coeff_uv_stride] + 1) >>
> 1;
> + decode_residu_cavlc(avctx, (x + x2 * 8) >> 1, (y + y2 * 8)
> >> 1,
> + 1, nc, &total_coeff_u);
> + decode_residu_cavlc(avctx, (x + x2 * 8) >> 1, (y + y2 * 8)
> >> 1,
> + 2, nc, &total_coeff_v);
> + total_coeff_uv[0] = (total_coeff_u + total_coeff_v + 1) >> 1;
> + } else
> + total_coeff_uv[0] = 0;
> +
> + total_coeff_y += 2;
> + total_coeff_uv++;
> + }
> + total_coeff_y += (s->total_coeff_y_stride << 1) - (w >> 2);
> + total_coeff_uv += s->total_coeff_uv_stride - (w >> 3);
> + }
> + return 0;
> +}
> +
> +static int predict_inter(AVCodecContext *avctx, int x, int y, int w, int h,
> + const MVec *predVec, int has_delta, int ref_frame)
> +{
> + ActimagineContext *s = avctx->priv_data;
> + GetBitContext *gb = &s->gb;
> + MVec vec = *predVec;
> +
> + if (ref_frame >= s->ref_frame_count) {
> + av_log(avctx, AV_LOG_ERROR, "reference to unavailable frame\n");
> + return AVERROR_INVALIDDATA;
> + }
> +
> + s->cur_frame->pict_type = AV_PICTURE_TYPE_P;
> + s->cur_frame->key_frame = 0;
> +
> + if (has_delta) {
> + vec.x += (unsigned)get_se_golomb(gb);
> + vec.y += (unsigned)get_se_golomb(gb);
> + }
> +
> + if (vec.x >= INT_MAX || vec.y >= INT_MAX)
> + return AVERROR_INVALIDDATA;
> +
> + s->vectors[(1 + (y >> 4)) * s->vectors_stride + 1 + (x >> 4)] = vec;
> +
> + if (x + vec.x < 0 || x + vec.x + w > avctx->width ||
> + y + vec.y < 0 || y + vec.y + h > avctx->height) {
> + av_log(avctx, AV_LOG_ERROR, "motion vector out of bounds\n");
> + return AVERROR_INVALIDDATA;
> + }
> +
> + // luma
> + for (int y2 = 0; y2 < h; y2++)
> + for (int x2 = 0; x2 < w; x2++)
> + PIXEL_CUR(s, 0, x + x2, y + y2)
> + = PIXEL_REF(s, ref_frame, 0, x + x2 + vec.x, y + y2 + vec.y);
> +
> + // chroma
> + for (int y2 = 0; y2 < (h >> 1); y2++) {
> + for (int x2 = 0; x2 < (w >> 1); x2++) {
> + // u
> + PIXEL_CUR(s, 1, (x >> 1) + x2, (y >> 1) + y2)
> + = PIXEL_REF(s, ref_frame, 1, (x >> 1) + x2 + (vec.x >> 1),
> + (y >> 1) + y2 + (vec.y >> 1));
> + // v
> + PIXEL_CUR(s, 2, (x >> 1) + x2, (y >> 1) + y2)
> + = PIXEL_REF(s, ref_frame, 2, (x >> 1) + x2 + (vec.x >> 1),
> + (y >> 1) + y2 + (vec.y >> 1));
> + }
> + }
> +
> + return 0;
> +}
> +
> +static int predict_inter_dc(AVCodecContext *avctx, int x, int y, int w, int
> h)
> +{
> + int dx, dy, dc_y, dc_u, dc_v;
> + ActimagineContext *s = avctx->priv_data;
> + GetBitContext *gb = &s->gb;
> +
> + if (s->ref_frame_count == 0) {
> + av_log(avctx, AV_LOG_ERROR, "reference to unavailable frame\n");
> + return AVERROR_INVALIDDATA;
> + }
> +
> + dx = get_se_golomb(gb);
> + dy = get_se_golomb(gb);
> +
> + if (x + dx < 0 || x + dx + w > avctx->width ||
> + y + dy < 0 || y + dy + h > avctx->height) {
> + av_log(avctx, AV_LOG_ERROR, "motion vector out of bounds\n");
> + return AVERROR_INVALIDDATA;
> + }
> +
> + dc_y = get_se_golomb(gb);
> + if (dc_y < -(1<<16) || dc_y >= (1 << 16)) {
> + av_log(avctx, AV_LOG_ERROR, "invalid dc offset\n");
> + return AVERROR_INVALIDDATA;
> + }
> + dc_y <<= 1;
> +
> + dc_u = get_se_golomb(gb);
> + if (dc_u < -(1<<16) || dc_u >= (1 << 16)) {
> + av_log(avctx, AV_LOG_ERROR, "invalid dc offset\n");
> + return AVERROR_INVALIDDATA;
> + }
> + dc_u <<= 1;
> +
> + dc_v = get_se_golomb(gb);
> + if (dc_v < -(1<<16) || dc_v >= (1 << 16)) {
> + av_log(avctx, AV_LOG_ERROR, "invalid dc offset\n");
> + return AVERROR_INVALIDDATA;
> + }
> + dc_v <<= 1;
> +
> + s->cur_frame->pict_type = AV_PICTURE_TYPE_P;
> + s->cur_frame->key_frame = 0;
> +
> + // luma
> + for (int y2 = 0; y2 < h; y2++)
> + for (int x2 = 0; x2 < w; x2++)
> + PIXEL_CUR(s, 0, x + x2, y + y2) = av_clip_uint8(
> + PIXEL_REF(s, 0, 0, x + x2 + dx, y + y2 + dy) + dc_y);
> +
> + // chroma
> + for (int y2 = 0; y2 < (h >> 1); y2++) {
> + for (int x2 = 0; x2 < (w >> 1); x2++) {
> + PIXEL_CUR(s, 1, (x >> 1) + x2, (y >> 1) + y2) = av_clip_uint8(
> + PIXEL_REF(s, 0, 1, (x >> 1) + x2 + (dx >> 1),
> + (y >> 1) + y2 + (dy >> 1)) + dc_u);
> + PIXEL_CUR(s, 2, (x >> 1) + x2, (y >> 1) + y2) = av_clip_uint8(
> + PIXEL_REF(s, 0, 2, (x >> 1) + x2 + (dx >> 1),
> + (y >> 1) + y2 + (dy >> 1)) + dc_v);
> + }
> + }
> +
> + return 0;
> +}
> +
> +static int decode_mb(AVCodecContext *avctx, int x, int y, int w, int h,
> + const MVec *predVec)
> +{
> + ActimagineContext *s = avctx->priv_data;
> + GetBitContext *gb = &s->gb;
> + int ret = 0;
> +
> + int mode = get_ue_golomb_31(gb);
> + if (s->version == VX_VERSION_OLD)
> + mode = old_mb_mode_remap_tab[mode];
> +
> + switch (mode) {
> + case 0:// v-split, no residu
> + if (w == 2) {
> + av_log(avctx, AV_LOG_ERROR, "invalid macroblock mode\n");
> + return AVERROR_INVALIDDATA;
> + }
> + if ((ret = decode_mb(avctx, x, y, w >> 1, h, predVec)) < 0)
> + return ret;
> + if ((ret = decode_mb(avctx, x + (w >> 1), y, w >> 1, h, predVec)) <
> 0)
> + return ret;
> + if (w == 8 && (h == 8 || h == 16))
> + clear_total_coeff(avctx, x, y, w, h);
> + break;
> + case 1:// no delta, no residu, ref 0
> + if ((ret = predict_inter(avctx, x, y, w, h, predVec, 0, 0)) < 0)
> + return ret;
> + if ((w == 8 || w == 16) && (h == 8 || h == 16))
> + clear_total_coeff(avctx, x, y, w, h);
> + break;
> + case 2:// h-split, no residu
> + if (h == 2) {
> + av_log(avctx, AV_LOG_ERROR, "invalid macroblock mode\n");
> + return AVERROR_INVALIDDATA;
> + }
> + if ((ret = decode_mb(avctx, x, y, w, h >> 1, predVec)) < 0)
> + return ret;
> + if ((ret = decode_mb(avctx, x, y + (h >> 1), w, h >> 1, predVec)) <
> 0)
> + return ret;
> + if ((w == 8 || w == 16) && h == 8)
> + clear_total_coeff(avctx, x, y, w, h);
> + break;
> + case 3:// unpredicted delta ref0 + dc offset, no residu
> + if ((ret = predict_inter_dc(avctx, x, y, w, h)) < 0)
> + return ret;
> + if ((w == 8 || w == 16) && (h == 8 || h == 16))
> + clear_total_coeff(avctx, x, y, w, h);
> + break;
> + case 4:// delta, no residu, ref 0
> + case 5:// delta, no residu, ref 1
> + case 6:// delta, no residu, ref 2
> + if ((ret = predict_inter(avctx, x, y, w, h, predVec, 1, mode - 4)) <
> 0)
> + return ret;
> + if ((w == 8 || w == 16) && (h == 8 || h == 16))
> + clear_total_coeff(avctx, x, y, w, h);
> + break;
> + case 7:// plane, no residu
> + if ((ret = predict_mb_plane(avctx, x, y, w, h)) < 0)
> + return ret;
> + if ((w == 8 || w == 16) && (h == 8 || h == 16))
> + clear_total_coeff(avctx, x, y, w, h);
> + break;
> + case 8:// v-split, residu
> + if (w == 2) {
> + av_log(avctx, AV_LOG_ERROR, "invalid macroblock mode\n");
> + return AVERROR_INVALIDDATA;
> + }
> + if ((ret = decode_mb(avctx, x, y, w >> 1, h, predVec)) < 0)
> + return ret;
> + if ((ret = decode_mb(avctx, x + (w >> 1), y, w >> 1, h, predVec)) <
> 0)
> + return ret;
> + if ((ret = decode_residu_blocks(avctx, x, y, w, h)) < 0)
> + return ret;
> + break;
> + case 9:// no delta, no residu, ref 1
> + if ((ret = predict_inter(avctx, x, y, w, h, predVec, 0, 1)) < 0)
> + return ret;
> + if ((w == 8 || w == 16) && (h == 8 || h == 16))
> + clear_total_coeff(avctx, x, y, w, h);
> + break;
> + case 10:// unpredicted delta ref0 + dc offset, residu
> + if ((ret = predict_inter_dc(avctx, x, y, w, h)) < 0)
> + return ret;
> + if ((ret = decode_residu_blocks(avctx, x, y, w, h)) < 0)
> + return ret;
> + break;
> + case 11:// predict notile, no residu
> + if ((ret = predict_notile(avctx, x, y, w, h)) < 0)
> + return ret;
> + if ((w == 8 || w == 16) && (h == 8 || h == 16))
> + clear_total_coeff(avctx, x, y, w, h);
> + break;
> + case 12:// no delta, residu, ref 0
> + if ((ret = predict_inter(avctx, x, y, w, h, predVec, 0, 0)) < 0)
> + return ret;
> + if ((ret = decode_residu_blocks(avctx, x, y, w, h)) < 0)
> + return ret;
> + break;
> + case 13:// h-split, residu
> + if (h == 2) {
> + av_log(avctx, AV_LOG_ERROR, "invalid macroblock mode\n");
> + return AVERROR_INVALIDDATA;
> + }
> + if ((ret = decode_mb(avctx, x, y, w, h >> 1, predVec)) < 0)
> + return ret;
> + if ((ret = decode_mb(avctx, x, y + (h >> 1), w, h >> 1, predVec)) <
> 0)
> + return ret;
> + if ((ret = decode_residu_blocks(avctx, x, y, w, h)) < 0)
> + return ret;
> + break;
> + case 14:// no delta, no residu, ref 2
> + if ((ret = predict_inter(avctx, x, y, w, h, predVec, 0, 2)) < 0)
> + return ret;
> + if ((w == 8 || w == 16) && (h == 8 || h == 16))
> + clear_total_coeff(avctx, x, y, w, h);
> + break;
> + case 15:// predict4, no residu
> + if ((ret = predict4(avctx, x, y, w, h)) < 0)
> + return ret;
> + if ((w == 8 || w == 16) && (h == 8 || h == 16))
> + clear_total_coeff(avctx, x, y, w, h);
> + break;
> + case 16:// delta, residu, ref 0
> + case 17:// delta, residu, ref 1
> + case 18:// delta, residu, ref 2
> + if ((ret = predict_inter(avctx, x, y, w, h, predVec, 1, mode - 16))
> < 0)
> + return ret;
> + if ((ret = decode_residu_blocks(avctx, x, y, w, h)) < 0)
> + return ret;
> + break;
> + case 19:// predict4, residu
> + if ((ret = predict4(avctx, x, y, w, h)) < 0)
> + return ret;
> + if ((ret = decode_residu_blocks(avctx, x, y, w, h)) < 0)
> + return ret;
> + break;
> + case 20:// no delta, residu, ref 1
> + case 21:// no delta, residu, ref 2
> + if ((ret = predict_inter(avctx, x, y, w, h, predVec, 0, mode - 20 +
> 1)) < 0)
> + return ret;
> + if ((ret = decode_residu_blocks(avctx, x, y, w, h)) < 0)
> + return ret;
> + break;
> + case 22:// predict notile, residu
> + if ((ret = predict_notile(avctx, x, y, w, h)) < 0)
> + return ret;
> + if ((ret = decode_residu_blocks(avctx, x, y, w, h)) < 0)
> + return ret;
> + break;
> + case 23:// plane, residu
> + if ((ret = predict_mb_plane(avctx, x, y, w, h)) < 0)
> + return ret;
> + if ((ret = decode_residu_blocks(avctx, x, y, w, h)) < 0)
> + return ret;
> + break;
> + default:
> + av_log(avctx, AV_LOG_ERROR, "invalid macroblock mode\n");
> + return AVERROR_INVALIDDATA;
> + }
> + return 0;
> +}
> +
> +static int detect_format(AVCodecContext *avctx)
> +{
> + // assume the new format, if any incorrect decisions are made for the
> + // first macroblock of a keyframe (ref, non-dc prediction) then it must
> be
> + // the old format
> + ActimagineContext *s = avctx->priv_data;
> + GetBitContext *gb = &s->gb;
> + int w = 16;
> + int h = 16;
> + while (1) {
> + int mode = get_ue_golomb_31(gb);
> + if (mode == 0 || mode == 8) { // v-split
> + if (w == 2) // too many splits
> + return VX_VERSION_OLD;
> + w >>= 1;
> + continue;
> + } else if (mode == 2 || mode == 13) { // h-split
> + if (h == 2) // too many splits
> + return VX_VERSION_OLD;
> + h >>= 1;
> + continue;
> + } else if (mode == 11 || mode == 22) { // predict notile
> + if (get_ue_golomb_31(gb) != 2) // mode_y != dc
> + return VX_VERSION_OLD;
> + if (get_ue_golomb_31(gb) != 0) // mode_uv != dc
> + return VX_VERSION_OLD;
> + break; //we should have enough evidence now
> + } else if (mode == 15 || mode == 19) { // predict4
> + // initial prediction is always dc
> + // we don't expect that prediction to be wrong
> + if (!get_bits1(gb))
> + return VX_VERSION_OLD;
> + break; //we should have enough evidence now
> + } else // inter prediction, plane or any other value
> + return VX_VERSION_OLD;
> + }
> + return VX_VERSION_NEW;
> +}
> +
> +static int actimagine_decode(AVCodecContext *avctx, void *data,
> + int *got_frame, AVPacket *pkt)
> +{
> + MVec *vectors;
> + int ret;
> + ActimagineContext *s = avctx->priv_data;
> + GetBitContext *gb = &s->gb;
> + AVFrame *frame = s->cur_frame;
> +
> + // in avi files the frames start with a 32 bit number that seems to
> + // indicate the total number of bits
> + int offset = s->avi ? 4 : 0;
> +
> + av_fast_padded_malloc(&s->bitstream, &s->bitstream_size,
> + pkt->size);
> +
> + if ((ret = ff_reget_buffer(avctx, frame, 0)) < 0)
> + return ret;
> +
> + s->bdsp.bswap16_buf((uint16_t *)s->bitstream, (uint16_t *)pkt->data,
> + (pkt->size + 1) >> 1);
> +
> + ret = init_get_bits8(gb, s->bitstream + offset,
> + FFALIGN(pkt->size - offset, 2));
> + if (ret < 0)
> + return ret;
> +
> + // determine the bitstream version if this was not done yet
> + if (s->version == VX_VERSION_INVALID) {
> + if (s->ref_frame_count != 0) {
> + av_log(avctx, AV_LOG_ERROR, "can't determine version on p
> frame\n");
> + return AVERROR_INVALIDDATA;
> + }
> + s->version = detect_format(avctx);
> +
> + // reinit bitreader
> + ret = init_get_bits8(gb, s->bitstream + offset,
> + FFALIGN(pkt->size - offset, 2));
> + if (ret < 0)
> + return ret;
> + }
> +
> + vectors = s->vectors + s->vectors_stride + 1;
> +
> + frame->pict_type = AV_PICTURE_TYPE_I;
> + frame->key_frame = 1;
> +
> + if (s->quantizer == -1) {
> + av_log(avctx, AV_LOG_ERROR, "no quantizer setup\n");
> + return AVERROR_INVALIDDATA;
> + }
> +
> + for (int y = 0; y < avctx->height; y += 16) {
> + MVec *vec_cur = vectors;
> + for (int x = 0; x < avctx->width; x += 16) {
> + MVec predVec;
> + vec_cur[0].x = 0;
> + vec_cur[0].y = 0;
> + predVec.x = mid_pred(vec_cur[-1].x,
> vec_cur[-s->vectors_stride].x,
> + vec_cur[-s->vectors_stride + 1].x);
> + predVec.y = mid_pred(vec_cur[-1].y,
> vec_cur[-s->vectors_stride].y,
> + vec_cur[-s->vectors_stride + 1].y);
> + if ((ret = decode_mb(avctx, x, y, 16, 16, &predVec)) < 0)
> + return ret;
> + vec_cur++;
> + }
> + vectors += s->vectors_stride;
> + }
> +
> + if (s->ref_frame_count == 3)
> + av_frame_unref(s->ref_frames[2]);
> +
> + s->cur_frame = s->ref_frames[2];
> + s->ref_frames[2] = s->ref_frames[1];
> + s->ref_frames[1] = s->ref_frames[0];
> + s->ref_frames[0] = frame;
> +
> + if (s->ref_frame_count < 3)
> + s->ref_frame_count++;
> +
> + if ((ret = av_frame_ref(data, frame)) < 0)
> + return ret;
> + *got_frame = 1;
> +
> + return 0;
> +}
> +
> +static void actimagine_flush(AVCodecContext *avctx)
> +{
> + ActimagineContext *s = avctx->priv_data;
> +
> + for (int i = 0; i < 3; i++)
> + av_frame_unref(s->ref_frames[i]);
> +
> + s->ref_frame_count = 0;
> +}
> +
> +static av_cold int actimagine_close(AVCodecContext *avctx)
> +{
> + ActimagineContext *s = avctx->priv_data;
> +
> + av_freep(&s->vectors);
> + s->vectors_stride = 0;
> + av_freep(&s->total_coeff_y);
> + s->total_coeff_y_stride = 0;
> + av_freep(&s->total_coeff_uv);
> + s->total_coeff_uv_stride = 0;
> +
> + av_freep(&s->bitstream);
> + s->bitstream_size = 0;
> +
> + for (int i = 0; i < 3; i++)
> + av_frame_free(&s->ref_frames[i]);
> + av_frame_free(&s->cur_frame);
> +
> + return 0;
> +}
> +
> +AVCodec ff_actimagine_decoder = {
> + .name = "actimagine",
> + .long_name = NULL_IF_CONFIG_SMALL("Actimagine VX Video"),
> + .type = AVMEDIA_TYPE_VIDEO,
> + .id = AV_CODEC_ID_ACTIMAGINE,
> + .priv_data_size = sizeof(ActimagineContext),
> + .init = actimagine_init,
> + .decode = actimagine_decode,
> + .flush = actimagine_flush,
> + .close = actimagine_close,
> + .capabilities = AV_CODEC_CAP_DR1,
> + .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
> FF_CODEC_CAP_INIT_CLEANUP,
> +};
> diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
> index 2e9a3581de..10809f3492 100644
> --- a/libavcodec/allcodecs.c
> +++ b/libavcodec/allcodecs.c
> @@ -32,6 +32,7 @@
> extern AVCodec ff_a64multi_encoder;
> extern AVCodec ff_a64multi5_encoder;
> extern AVCodec ff_aasc_decoder;
> +extern AVCodec ff_actimagine_decoder;
> extern AVCodec ff_aic_decoder;
> extern AVCodec ff_alias_pix_encoder;
> extern AVCodec ff_alias_pix_decoder;
> diff --git a/libavcodec/codec_desc.c b/libavcodec/codec_desc.c
> index 17f8a14044..65d96c21af 100644
> --- a/libavcodec/codec_desc.c
> +++ b/libavcodec/codec_desc.c
> @@ -1856,6 +1856,13 @@ static const AVCodecDescriptor codec_descriptors[] = {
> .long_name = NULL_IF_CONFIG_SMALL("Digital Pictures SGA Video"),
> .props = AV_CODEC_PROP_LOSSY,
> },
> + {
> + .id = AV_CODEC_ID_ACTIMAGINE,
> + .type = AVMEDIA_TYPE_VIDEO,
> + .name = "actimagine",
> + .long_name = NULL_IF_CONFIG_SMALL("Actimagine VX Video"),
> + .props = AV_CODEC_PROP_LOSSY,
> + },
>
> /* various PCM "codecs" */
> {
> diff --git a/libavcodec/codec_id.h b/libavcodec/codec_id.h
> index ab7bc68ee2..a4b3f3955d 100644
> --- a/libavcodec/codec_id.h
> +++ b/libavcodec/codec_id.h
> @@ -307,6 +307,7 @@ enum AVCodecID {
> AV_CODEC_ID_CRI,
> AV_CODEC_ID_SIMBIOSIS_IMX,
> AV_CODEC_ID_SGA_VIDEO,
> + AV_CODEC_ID_ACTIMAGINE,
>
> /* various PCM "codecs" */
> AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the
> start of audio codecs
> diff --git a/libavcodec/version.h b/libavcodec/version.h
> index 4299ad4239..f992e1b36e 100644
> --- a/libavcodec/version.h
> +++ b/libavcodec/version.h
> @@ -28,7 +28,7 @@
> #include "libavutil/version.h"
>
> #define LIBAVCODEC_VERSION_MAJOR 58
> -#define LIBAVCODEC_VERSION_MINOR 131
> +#define LIBAVCODEC_VERSION_MINOR 132
> #define LIBAVCODEC_VERSION_MICRO 100
>
> #define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
> diff --git a/libavformat/riff.c b/libavformat/riff.c
> index 270ff7c024..5d5cfe16b0 100644
> --- a/libavformat/riff.c
> +++ b/libavformat/riff.c
> @@ -496,6 +496,8 @@ const AVCodecTag ff_codec_bmp_tags[] = {
> { AV_CODEC_ID_MVHA, MKTAG('M', 'V', 'H', 'A') },
> { AV_CODEC_ID_MV30, MKTAG('M', 'V', '3', '0') },
> { AV_CODEC_ID_NOTCHLC, MKTAG('n', 'l', 'c', '1') },
> + { AV_CODEC_ID_ACTIMAGINE, MKTAG('V', 'X', 'S', '1') },
> + { AV_CODEC_ID_ACTIMAGINE, MKTAG('v', 'x', 's', '1') },
> { AV_CODEC_ID_NONE, 0 }
> };
>
>
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