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ffmpeg/libavcodec/truemotion2.c
Andreas Rheinhardt a247ac640d avcodec: Constify AVCodecs 
Given that the AVCodec.next pointer has now been removed, most of the
AVCodecs are not modified at all any more and can therefore be made
const (as this patch does); the only exceptions are the very few codecs
for external libraries that have a init_static_data callback.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Signed-off-by: James Almer <jamrial@gmail.com>
2021-04-27 10:43:15 -03:00

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/*
* Duck/ON2 TrueMotion 2 Decoder
* Copyright (c) 2005 Konstantin Shishkov
*
* 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
*/
/**
* @file
* Duck TrueMotion2 decoder.
*/
#include <inttypes.h>
#include "avcodec.h"
#include "bswapdsp.h"
#include "bytestream.h"
#include "get_bits.h"
#include "internal.h"
#define TM2_ESCAPE 0x80000000
#define TM2_DELTAS 64
/* Huffman-coded streams of different types of blocks */
enum TM2_STREAMS {
TM2_C_HI = 0,
TM2_C_LO,
TM2_L_HI,
TM2_L_LO,
TM2_UPD,
TM2_MOT,
TM2_TYPE,
TM2_NUM_STREAMS
};
/* Block types */
enum TM2_BLOCKS {
TM2_HI_RES = 0,
TM2_MED_RES,
TM2_LOW_RES,
TM2_NULL_RES,
TM2_UPDATE,
TM2_STILL,
TM2_MOTION
};
typedef struct TM2Context {
AVCodecContext *avctx;
AVFrame *pic;
GetBitContext gb;
int error;
BswapDSPContext bdsp;
uint8_t *buffer;
int buffer_size;
/* TM2 streams */
int *tokens[TM2_NUM_STREAMS];
int tok_lens[TM2_NUM_STREAMS];
int tok_ptrs[TM2_NUM_STREAMS];
int deltas[TM2_NUM_STREAMS][TM2_DELTAS];
/* for blocks decoding */
int D[4];
int CD[4];
int *last;
int *clast;
/* data for current and previous frame */
int *Y_base, *UV_base;
int *Y1, *U1, *V1, *Y2, *U2, *V2;
int y_stride, uv_stride;
int cur;
} TM2Context;
/**
* Huffman codes for each of streams
*/
typedef struct TM2Codes {
VLC vlc; ///< table for FFmpeg bitstream reader
int bits;
int *recode; ///< table for converting from code indexes to values
int length;
} TM2Codes;
/**
* structure for gathering Huffman codes information
*/
typedef struct TM2Huff {
int val_bits; ///< length of literal
int max_bits; ///< maximum length of code
int min_bits; ///< minimum length of code
int nodes; ///< total number of nodes in tree
int num; ///< current number filled
int max_num; ///< total number of codes
int *nums; ///< literals
uint8_t *lens; ///< codelengths
} TM2Huff;
/**
*
* @returns the length of the longest code or an AVERROR code
*/
static int tm2_read_tree(TM2Context *ctx, int length, TM2Huff *huff)
{
int ret, ret2;
if (length > huff->max_bits) {
av_log(ctx->avctx, AV_LOG_ERROR, "Tree exceeded its given depth (%i)\n",
huff->max_bits);
return AVERROR_INVALIDDATA;
}
if (!get_bits1(&ctx->gb)) { /* literal */
if (length == 0) {
length = 1;
}
if (huff->num >= huff->max_num) {
av_log(ctx->avctx, AV_LOG_DEBUG, "Too many literals\n");
return AVERROR_INVALIDDATA;
}
huff->nums[huff->num] = get_bits_long(&ctx->gb, huff->val_bits);
huff->lens[huff->num] = length;
huff->num++;
return length;
} else { /* non-terminal node */
if ((ret2 = tm2_read_tree(ctx, length + 1, huff)) < 0)
return ret2;
if ((ret = tm2_read_tree(ctx, length + 1, huff)) < 0)
return ret;
}
return FFMAX(ret, ret2);
}
static int tm2_build_huff_table(TM2Context *ctx, TM2Codes *code)
{
TM2Huff huff;
int res = 0;
huff.val_bits = get_bits(&ctx->gb, 5);
huff.max_bits = get_bits(&ctx->gb, 5);
huff.min_bits = get_bits(&ctx->gb, 5);
huff.nodes = get_bits(&ctx->gb, 17);
huff.num = 0;
/* check for correct codes parameters */
if ((huff.val_bits < 1) || (huff.val_bits > 32) ||
(huff.max_bits < 0) || (huff.max_bits > 25)) {
av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect tree parameters - literal "
"length: %i, max code length: %i\n", huff.val_bits, huff.max_bits);
return AVERROR_INVALIDDATA;
}
if ((huff.nodes <= 0) || (huff.nodes > 0x10000)) {
av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect number of Huffman tree "
"nodes: %i\n", huff.nodes);
return AVERROR_INVALIDDATA;
}
/* one-node tree */
if (huff.max_bits == 0)
huff.max_bits = 1;
/* allocate space for codes - it is exactly ceil(nodes / 2) entries */
huff.max_num = (huff.nodes + 1) >> 1;
huff.nums = av_calloc(huff.max_num, sizeof(int));
huff.lens = av_mallocz(huff.max_num);
if (!huff.nums || !huff.lens) {
res = AVERROR(ENOMEM);
goto out;
}
res = tm2_read_tree(ctx, 0, &huff);
if (res >= 0 && res != huff.max_bits) {
av_log(ctx->avctx, AV_LOG_ERROR, "Got less bits than expected: %i of %i\n",
res, huff.max_bits);
res = AVERROR_INVALIDDATA;
}
if (huff.num != huff.max_num) {
av_log(ctx->avctx, AV_LOG_ERROR, "Got less codes than expected: %i of %i\n",
huff.num, huff.max_num);
res = AVERROR_INVALIDDATA;
}
/* convert codes to vlc_table */
if (res >= 0) {
res = ff_init_vlc_from_lengths(&code->vlc, huff.max_bits, huff.max_num,
huff.lens, sizeof(huff.lens[0]),
NULL, 0, 0, 0, 0, ctx->avctx);
if (res < 0)
av_log(ctx->avctx, AV_LOG_ERROR, "Cannot build VLC table\n");
else {
code->bits = huff.max_bits;
code->length = huff.max_num;
code->recode = huff.nums;
huff.nums = NULL;
}
}
out:
/* free allocated memory */
av_free(huff.nums);
av_free(huff.lens);
return res;
}
static void tm2_free_codes(TM2Codes *code)
{
av_free(code->recode);
if (code->vlc.table)
ff_free_vlc(&code->vlc);
}
static inline int tm2_get_token(GetBitContext *gb, TM2Codes *code)
{
int val;
val = get_vlc2(gb, code->vlc.table, code->bits, 1);
if(val<0)
return -1;
return code->recode[val];
}
#define TM2_OLD_HEADER_MAGIC 0x00000100
#define TM2_NEW_HEADER_MAGIC 0x00000101
static inline int tm2_read_header(TM2Context *ctx, const uint8_t *buf)
{
uint32_t magic = AV_RL32(buf);
switch (magic) {
case TM2_OLD_HEADER_MAGIC:
avpriv_request_sample(ctx->avctx, "Old TM2 header");
return 0;
case TM2_NEW_HEADER_MAGIC:
return 0;
default:
av_log(ctx->avctx, AV_LOG_ERROR, "Not a TM2 header: 0x%08"PRIX32"\n",
magic);
return AVERROR_INVALIDDATA;
}
}
static int tm2_read_deltas(TM2Context *ctx, int stream_id)
{
int d, mb;
int i, v;
d = get_bits(&ctx->gb, 9);
mb = get_bits(&ctx->gb, 5);
av_assert2(mb < 32);
if ((d < 1) || (d > TM2_DELTAS) || (mb < 1)) {
av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect delta table: %i deltas x %i bits\n", d, mb);
return AVERROR_INVALIDDATA;
}
for (i = 0; i < d; i++) {
v = get_bits_long(&ctx->gb, mb);
if (v & (1 << (mb - 1)))
ctx->deltas[stream_id][i] = v - (1U << mb);
else
ctx->deltas[stream_id][i] = v;
}
for (; i < TM2_DELTAS; i++)
ctx->deltas[stream_id][i] = 0;
return 0;
}
static int tm2_read_stream(TM2Context *ctx, const uint8_t *buf, int stream_id, int buf_size)
{
int i, ret;
int skip = 0;
int len, toks, pos;
TM2Codes codes;
GetByteContext gb;
if (buf_size < 4) {
av_log(ctx->avctx, AV_LOG_ERROR, "not enough space for len left\n");
return AVERROR_INVALIDDATA;
}
/* get stream length in dwords */
bytestream2_init(&gb, buf, buf_size);
len = bytestream2_get_be32(&gb);
if (len == 0)
return 4;
if (len >= INT_MAX / 4 - 1 || len < 0 || len * 4 + 4 > buf_size) {
av_log(ctx->avctx, AV_LOG_ERROR, "Error, invalid stream size.\n");
return AVERROR_INVALIDDATA;
}
skip = len * 4 + 4;
toks = bytestream2_get_be32(&gb);
if (toks & 1) {
len = bytestream2_get_be32(&gb);
if (len == TM2_ESCAPE) {
len = bytestream2_get_be32(&gb);
}
if (len > 0) {
pos = bytestream2_tell(&gb);
if (skip <= pos)
return AVERROR_INVALIDDATA;
init_get_bits(&ctx->gb, buf + pos, (skip - pos) * 8);
if ((ret = tm2_read_deltas(ctx, stream_id)) < 0)
return ret;
bytestream2_skip(&gb, ((get_bits_count(&ctx->gb) + 31) >> 5) << 2);
}
}
/* skip unused fields */
len = bytestream2_get_be32(&gb);
if (len == TM2_ESCAPE) { /* some unknown length - could be escaped too */
bytestream2_skip(&gb, 8); /* unused by decoder */
} else {
bytestream2_skip(&gb, 4); /* unused by decoder */
}
pos = bytestream2_tell(&gb);
if (skip <= pos)
return AVERROR_INVALIDDATA;
init_get_bits(&ctx->gb, buf + pos, (skip - pos) * 8);
if ((ret = tm2_build_huff_table(ctx, &codes)) < 0)
return ret;
bytestream2_skip(&gb, ((get_bits_count(&ctx->gb) + 31) >> 5) << 2);
toks >>= 1;
/* check if we have sane number of tokens */
if ((toks < 0) || (toks > 0xFFFFFF)) {
av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect number of tokens: %i\n", toks);
ret = AVERROR_INVALIDDATA;
goto end;
}
ret = av_reallocp_array(&ctx->tokens[stream_id], toks, sizeof(int));
if (ret < 0) {
ctx->tok_lens[stream_id] = 0;
goto end;
}
ctx->tok_lens[stream_id] = toks;
len = bytestream2_get_be32(&gb);
if (len > 0) {
pos = bytestream2_tell(&gb);
if (skip <= pos) {
ret = AVERROR_INVALIDDATA;
goto end;
}
init_get_bits(&ctx->gb, buf + pos, (skip - pos) * 8);
for (i = 0; i < toks; i++) {
if (get_bits_left(&ctx->gb) <= 0) {
av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect number of tokens: %i\n", toks);
ret = AVERROR_INVALIDDATA;
goto end;
}
ctx->tokens[stream_id][i] = tm2_get_token(&ctx->gb, &codes);
if (stream_id <= TM2_MOT && ctx->tokens[stream_id][i] >= TM2_DELTAS || ctx->tokens[stream_id][i]<0) {
av_log(ctx->avctx, AV_LOG_ERROR, "Invalid delta token index %d for type %d, n=%d\n",
ctx->tokens[stream_id][i], stream_id, i);
ret = AVERROR_INVALIDDATA;
goto end;
}
}
} else {
if (len < 0) {
ret = AVERROR_INVALIDDATA;
goto end;
}
for (i = 0; i < toks; i++) {
ctx->tokens[stream_id][i] = codes.recode[0];
if (stream_id <= TM2_MOT && ctx->tokens[stream_id][i] >= TM2_DELTAS) {
av_log(ctx->avctx, AV_LOG_ERROR, "Invalid delta token index %d for type %d, n=%d\n",
ctx->tokens[stream_id][i], stream_id, i);
ret = AVERROR_INVALIDDATA;
goto end;
}
}
}
ret = skip;
end:
tm2_free_codes(&codes);
return ret;
}
static inline int GET_TOK(TM2Context *ctx,int type)
{
if (ctx->tok_ptrs[type] >= ctx->tok_lens[type]) {
av_log(ctx->avctx, AV_LOG_ERROR, "Read token from stream %i out of bounds (%i>=%i)\n", type, ctx->tok_ptrs[type], ctx->tok_lens[type]);
ctx->error = 1;
return 0;
}
if (type <= TM2_MOT) {
if (ctx->tokens[type][ctx->tok_ptrs[type]] >= TM2_DELTAS) {
av_log(ctx->avctx, AV_LOG_ERROR, "token %d is too large\n", ctx->tokens[type][ctx->tok_ptrs[type]]);
return 0;
}
return ctx->deltas[type][ctx->tokens[type][ctx->tok_ptrs[type]++]];
}
return ctx->tokens[type][ctx->tok_ptrs[type]++];
}
/* blocks decoding routines */
/* common Y, U, V pointers initialisation */
#define TM2_INIT_POINTERS() \
int *last, *clast; \
int *Y, *U, *V;\
int Ystride, Ustride, Vstride;\
\
Ystride = ctx->y_stride;\
Vstride = ctx->uv_stride;\
Ustride = ctx->uv_stride;\
Y = (ctx->cur?ctx->Y2:ctx->Y1) + by * 4 * Ystride + bx * 4;\
V = (ctx->cur?ctx->V2:ctx->V1) + by * 2 * Vstride + bx * 2;\
U = (ctx->cur?ctx->U2:ctx->U1) + by * 2 * Ustride + bx * 2;\
last = ctx->last + bx * 4;\
clast = ctx->clast + bx * 4;
#define TM2_INIT_POINTERS_2() \
unsigned *Yo, *Uo, *Vo;\
int oYstride, oUstride, oVstride;\
\
TM2_INIT_POINTERS();\
oYstride = Ystride;\
oVstride = Vstride;\
oUstride = Ustride;\
Yo = (ctx->cur?ctx->Y1:ctx->Y2) + by * 4 * oYstride + bx * 4;\
Vo = (ctx->cur?ctx->V1:ctx->V2) + by * 2 * oVstride + bx * 2;\
Uo = (ctx->cur?ctx->U1:ctx->U2) + by * 2 * oUstride + bx * 2;
/* recalculate last and delta values for next blocks */
#define TM2_RECALC_BLOCK(CHR, stride, last, CD) {\
CD[0] = (unsigned)CHR[ 1] - (unsigned)last[1];\
CD[1] = (unsigned)CHR[stride + 1] - (unsigned) CHR[1];\
last[0] = (int)CHR[stride + 0];\
last[1] = (int)CHR[stride + 1];}
/* common operations - add deltas to 4x4 block of luma or 2x2 blocks of chroma */
static inline void tm2_apply_deltas(TM2Context *ctx, int* Y, int stride, int *deltas, int *last)
{
unsigned ct, d;
int i, j;
for (j = 0; j < 4; j++){
ct = ctx->D[j];
for (i = 0; i < 4; i++){
d = deltas[i + j * 4];
ct += d;
last[i] += ct;
Y[i] = av_clip_uint8(last[i]);
}
Y += stride;
ctx->D[j] = ct;
}
}
static inline void tm2_high_chroma(int *data, int stride, int *last, unsigned *CD, int *deltas)
{
int i, j;
for (j = 0; j < 2; j++) {
for (i = 0; i < 2; i++) {
CD[j] += deltas[i + j * 2];
last[i] += CD[j];
data[i] = last[i];
}
data += stride;
}
}
static inline void tm2_low_chroma(int *data, int stride, int *clast, unsigned *CD, int *deltas, int bx)
{
int t;
int l;
int prev;
if (bx > 0)
prev = clast[-3];
else
prev = 0;
t = (int)(CD[0] + CD[1]) >> 1;
l = (int)(prev - CD[0] - CD[1] + clast[1]) >> 1;
CD[1] = CD[0] + CD[1] - t;
CD[0] = t;
clast[0] = l;
tm2_high_chroma(data, stride, clast, CD, deltas);
}
static inline void tm2_hi_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
{
int i;
int deltas[16];
TM2_INIT_POINTERS();
/* hi-res chroma */
for (i = 0; i < 4; i++) {
deltas[i] = GET_TOK(ctx, TM2_C_HI);
deltas[i + 4] = GET_TOK(ctx, TM2_C_HI);
}
tm2_high_chroma(U, Ustride, clast, ctx->CD, deltas);
tm2_high_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas + 4);
/* hi-res luma */
for (i = 0; i < 16; i++)
deltas[i] = GET_TOK(ctx, TM2_L_HI);
tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
}
static inline void tm2_med_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
{
int i;
int deltas[16];
TM2_INIT_POINTERS();
/* low-res chroma */
deltas[0] = GET_TOK(ctx, TM2_C_LO);
deltas[1] = deltas[2] = deltas[3] = 0;
tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);
deltas[0] = GET_TOK(ctx, TM2_C_LO);
deltas[1] = deltas[2] = deltas[3] = 0;
tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);
/* hi-res luma */
for (i = 0; i < 16; i++)
deltas[i] = GET_TOK(ctx, TM2_L_HI);
tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
}
static inline void tm2_low_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
{
int i;
int t1, t2;
int deltas[16];
TM2_INIT_POINTERS();
/* low-res chroma */
deltas[0] = GET_TOK(ctx, TM2_C_LO);
deltas[1] = deltas[2] = deltas[3] = 0;
tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);
deltas[0] = GET_TOK(ctx, TM2_C_LO);
deltas[1] = deltas[2] = deltas[3] = 0;
tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);
/* low-res luma */
for (i = 0; i < 16; i++)
deltas[i] = 0;
deltas[ 0] = GET_TOK(ctx, TM2_L_LO);
deltas[ 2] = GET_TOK(ctx, TM2_L_LO);
deltas[ 8] = GET_TOK(ctx, TM2_L_LO);
deltas[10] = GET_TOK(ctx, TM2_L_LO);
if (bx > 0)
last[0] = (int)((unsigned)last[-1] - ctx->D[0] - ctx->D[1] - ctx->D[2] - ctx->D[3] + last[1]) >> 1;
else
last[0] = (int)((unsigned)last[1] - ctx->D[0] - ctx->D[1] - ctx->D[2] - ctx->D[3])>> 1;
last[2] = (int)((unsigned)last[1] + last[3]) >> 1;
t1 = ctx->D[0] + (unsigned)ctx->D[1];
ctx->D[0] = t1 >> 1;
ctx->D[1] = t1 - (t1 >> 1);
t2 = ctx->D[2] + (unsigned)ctx->D[3];
ctx->D[2] = t2 >> 1;
ctx->D[3] = t2 - (t2 >> 1);
tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
}
static inline void tm2_null_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
{
int i;
int ct;
unsigned left, right;
int diff;
int deltas[16];
TM2_INIT_POINTERS();
/* null chroma */
deltas[0] = deltas[1] = deltas[2] = deltas[3] = 0;
tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);
deltas[0] = deltas[1] = deltas[2] = deltas[3] = 0;
tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);
/* null luma */
for (i = 0; i < 16; i++)
deltas[i] = 0;
ct = (unsigned)ctx->D[0] + ctx->D[1] + ctx->D[2] + ctx->D[3];
if (bx > 0)
left = last[-1] - (unsigned)ct;
else
left = 0;
right = last[3];
diff = right - left;
last[0] = left + (diff >> 2);
last[1] = left + (diff >> 1);
last[2] = right - (diff >> 2);
last[3] = right;
{
unsigned tp = left;
ctx->D[0] = (tp + (ct >> 2)) - left;
left += ctx->D[0];
ctx->D[1] = (tp + (ct >> 1)) - left;
left += ctx->D[1];
ctx->D[2] = ((tp + ct) - (ct >> 2)) - left;
left += ctx->D[2];
ctx->D[3] = (tp + ct) - left;
}
tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
}
static inline void tm2_still_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
{
int i, j;
TM2_INIT_POINTERS_2();
/* update chroma */
for (j = 0; j < 2; j++) {
for (i = 0; i < 2; i++){
U[i] = Uo[i];
V[i] = Vo[i];
}
U += Ustride; V += Vstride;
Uo += oUstride; Vo += oVstride;
}
U -= Ustride * 2;
V -= Vstride * 2;
TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);
TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));
/* update deltas */
ctx->D[0] = Yo[3] - last[3];
ctx->D[1] = Yo[3 + oYstride] - Yo[3];
ctx->D[2] = Yo[3 + oYstride * 2] - Yo[3 + oYstride];
ctx->D[3] = Yo[3 + oYstride * 3] - Yo[3 + oYstride * 2];
for (j = 0; j < 4; j++) {
for (i = 0; i < 4; i++) {
Y[i] = Yo[i];
last[i] = Yo[i];
}
Y += Ystride;
Yo += oYstride;
}
}
static inline void tm2_update_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
{
int i, j;
unsigned d;
TM2_INIT_POINTERS_2();
/* update chroma */
for (j = 0; j < 2; j++) {
for (i = 0; i < 2; i++) {
U[i] = Uo[i] + GET_TOK(ctx, TM2_UPD);
V[i] = Vo[i] + GET_TOK(ctx, TM2_UPD);
}
U += Ustride;
V += Vstride;
Uo += oUstride;
Vo += oVstride;
}
U -= Ustride * 2;
V -= Vstride * 2;
TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);
TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));
/* update deltas */
ctx->D[0] = Yo[3] - last[3];
ctx->D[1] = Yo[3 + oYstride] - Yo[3];
ctx->D[2] = Yo[3 + oYstride * 2] - Yo[3 + oYstride];
ctx->D[3] = Yo[3 + oYstride * 3] - Yo[3 + oYstride * 2];
for (j = 0; j < 4; j++) {
d = last[3];
for (i = 0; i < 4; i++) {
Y[i] = Yo[i] + (unsigned)GET_TOK(ctx, TM2_UPD);
last[i] = Y[i];
}
ctx->D[j] = last[3] - d;
Y += Ystride;
Yo += oYstride;
}
}
static inline void tm2_motion_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
{
int i, j;
int mx, my;
TM2_INIT_POINTERS_2();
mx = GET_TOK(ctx, TM2_MOT);
my = GET_TOK(ctx, TM2_MOT);
mx = av_clip(mx, -(bx * 4 + 4), ctx->avctx->width - bx * 4);
my = av_clip(my, -(by * 4 + 4), ctx->avctx->height - by * 4);
if (4*bx+mx<0 || 4*by+my<0 || 4*bx+mx+4 > ctx->avctx->width || 4*by+my+4 > ctx->avctx->height) {
av_log(ctx->avctx, AV_LOG_ERROR, "MV out of picture\n");
return;
}
Yo += my * oYstride + mx;
Uo += (my >> 1) * oUstride + (mx >> 1);
Vo += (my >> 1) * oVstride + (mx >> 1);
/* copy chroma */
for (j = 0; j < 2; j++) {
for (i = 0; i < 2; i++) {
U[i] = Uo[i];
V[i] = Vo[i];
}
U += Ustride;
V += Vstride;
Uo += oUstride;
Vo += oVstride;
}
U -= Ustride * 2;
V -= Vstride * 2;
TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);
TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));
/* copy luma */
for (j = 0; j < 4; j++) {
for (i = 0; i < 4; i++) {
Y[i] = Yo[i];
}
Y += Ystride;
Yo += oYstride;
}
/* calculate deltas */
Y -= Ystride * 4;
ctx->D[0] = (unsigned)Y[3] - last[3];
ctx->D[1] = (unsigned)Y[3 + Ystride] - Y[3];
ctx->D[2] = (unsigned)Y[3 + Ystride * 2] - Y[3 + Ystride];
ctx->D[3] = (unsigned)Y[3 + Ystride * 3] - Y[3 + Ystride * 2];
for (i = 0; i < 4; i++)
last[i] = Y[i + Ystride * 3];
}
static int tm2_decode_blocks(TM2Context *ctx, AVFrame *p)
{
int i, j;
int w = ctx->avctx->width, h = ctx->avctx->height, bw = w >> 2, bh = h >> 2, cw = w >> 1;
int type;
int keyframe = 1;
int *Y, *U, *V;
uint8_t *dst;
for (i = 0; i < TM2_NUM_STREAMS; i++)
ctx->tok_ptrs[i] = 0;
if (ctx->tok_lens[TM2_TYPE]<bw*bh) {
av_log(ctx->avctx,AV_LOG_ERROR,"Got %i tokens for %i blocks\n",ctx->tok_lens[TM2_TYPE],bw*bh);
return AVERROR_INVALIDDATA;
}
memset(ctx->last, 0, 4 * bw * sizeof(int));
memset(ctx->clast, 0, 4 * bw * sizeof(int));
for (j = 0; j < bh; j++) {
memset(ctx->D, 0, 4 * sizeof(int));
memset(ctx->CD, 0, 4 * sizeof(int));
for (i = 0; i < bw; i++) {
type = GET_TOK(ctx, TM2_TYPE);
switch(type) {
case TM2_HI_RES:
tm2_hi_res_block(ctx, p, i, j);
break;
case TM2_MED_RES:
tm2_med_res_block(ctx, p, i, j);
break;
case TM2_LOW_RES:
tm2_low_res_block(ctx, p, i, j);
break;
case TM2_NULL_RES:
tm2_null_res_block(ctx, p, i, j);
break;
case TM2_UPDATE:
tm2_update_block(ctx, p, i, j);
keyframe = 0;
break;
case TM2_STILL:
tm2_still_block(ctx, p, i, j);
keyframe = 0;
break;
case TM2_MOTION:
tm2_motion_block(ctx, p, i, j);
keyframe = 0;
break;
default:
av_log(ctx->avctx, AV_LOG_ERROR, "Skipping unknown block type %i\n", type);
}
if (ctx->error)
return AVERROR_INVALIDDATA;
}
}
/* copy data from our buffer to AVFrame */
Y = (ctx->cur?ctx->Y2:ctx->Y1);
U = (ctx->cur?ctx->U2:ctx->U1);
V = (ctx->cur?ctx->V2:ctx->V1);
dst = p->data[0];
for (j = 0; j < h; j++) {
for (i = 0; i < w; i++) {
unsigned y = Y[i], u = U[i >> 1], v = V[i >> 1];
dst[3*i+0] = av_clip_uint8(y + v);
dst[3*i+1] = av_clip_uint8(y);
dst[3*i+2] = av_clip_uint8(y + u);
}
/* horizontal edge extension */
Y[-4] = Y[-3] = Y[-2] = Y[-1] = Y[0];
Y[w + 3] = Y[w + 2] = Y[w + 1] = Y[w] = Y[w - 1];
/* vertical edge extension */
if (j == 0) {
memcpy(Y - 4 - 1 * ctx->y_stride, Y - 4, ctx->y_stride);
memcpy(Y - 4 - 2 * ctx->y_stride, Y - 4, ctx->y_stride);
memcpy(Y - 4 - 3 * ctx->y_stride, Y - 4, ctx->y_stride);
memcpy(Y - 4 - 4 * ctx->y_stride, Y - 4, ctx->y_stride);
} else if (j == h - 1) {
memcpy(Y - 4 + 1 * ctx->y_stride, Y - 4, ctx->y_stride);
memcpy(Y - 4 + 2 * ctx->y_stride, Y - 4, ctx->y_stride);
memcpy(Y - 4 + 3 * ctx->y_stride, Y - 4, ctx->y_stride);
memcpy(Y - 4 + 4 * ctx->y_stride, Y - 4, ctx->y_stride);
}
Y += ctx->y_stride;
if (j & 1) {
/* horizontal edge extension */
U[-2] = U[-1] = U[0];
V[-2] = V[-1] = V[0];
U[cw + 1] = U[cw] = U[cw - 1];
V[cw + 1] = V[cw] = V[cw - 1];
/* vertical edge extension */
if (j == 1) {
memcpy(U - 2 - 1 * ctx->uv_stride, U - 2, ctx->uv_stride);
memcpy(V - 2 - 1 * ctx->uv_stride, V - 2, ctx->uv_stride);
memcpy(U - 2 - 2 * ctx->uv_stride, U - 2, ctx->uv_stride);
memcpy(V - 2 - 2 * ctx->uv_stride, V - 2, ctx->uv_stride);
} else if (j == h - 1) {
memcpy(U - 2 + 1 * ctx->uv_stride, U - 2, ctx->uv_stride);
memcpy(V - 2 + 1 * ctx->uv_stride, V - 2, ctx->uv_stride);
memcpy(U - 2 + 2 * ctx->uv_stride, U - 2, ctx->uv_stride);
memcpy(V - 2 + 2 * ctx->uv_stride, V - 2, ctx->uv_stride);
}
U += ctx->uv_stride;
V += ctx->uv_stride;
}
dst += p->linesize[0];
}
return keyframe;
}
static const int tm2_stream_order[TM2_NUM_STREAMS] = {
TM2_C_HI, TM2_C_LO, TM2_L_HI, TM2_L_LO, TM2_UPD, TM2_MOT, TM2_TYPE
};
#define TM2_HEADER_SIZE 40
static int decode_frame(AVCodecContext *avctx,
void *data, int *got_frame,
AVPacket *avpkt)
{
TM2Context * const l = avctx->priv_data;
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size & ~3;
AVFrame * const p = l->pic;
int offset = TM2_HEADER_SIZE;
int i, t, ret;
l->error = 0;
av_fast_padded_malloc(&l->buffer, &l->buffer_size, buf_size);
if (!l->buffer) {
av_log(avctx, AV_LOG_ERROR, "Cannot allocate temporary buffer\n");
return AVERROR(ENOMEM);
}
if ((ret = ff_reget_buffer(avctx, p, 0)) < 0)
return ret;
l->bdsp.bswap_buf((uint32_t *) l->buffer, (const uint32_t *) buf,
buf_size >> 2);
if ((ret = tm2_read_header(l, l->buffer)) < 0) {
return ret;
}
for (i = 0; i < TM2_NUM_STREAMS; i++) {
if (offset >= buf_size) {
av_log(avctx, AV_LOG_ERROR, "no space for tm2_read_stream\n");
return AVERROR_INVALIDDATA;
}
t = tm2_read_stream(l, l->buffer + offset, tm2_stream_order[i],
buf_size - offset);
if (t < 0) {
int j = tm2_stream_order[i];
if (l->tok_lens[j])
memset(l->tokens[j], 0, sizeof(**l->tokens) * l->tok_lens[j]);
return t;
}
offset += t;
}
p->key_frame = tm2_decode_blocks(l, p);
if (p->key_frame)
p->pict_type = AV_PICTURE_TYPE_I;
else
p->pict_type = AV_PICTURE_TYPE_P;
l->cur = !l->cur;
*got_frame = 1;
ret = av_frame_ref(data, l->pic);
return (ret < 0) ? ret : buf_size;
}
static av_cold int decode_init(AVCodecContext *avctx)
{
TM2Context * const l = avctx->priv_data;
int w = avctx->width, h = avctx->height;
if ((avctx->width & 3) || (avctx->height & 3)) {
av_log(avctx, AV_LOG_ERROR, "Width and height must be multiple of 4\n");
return AVERROR(EINVAL);
}
l->avctx = avctx;
avctx->pix_fmt = AV_PIX_FMT_BGR24;
l->pic = av_frame_alloc();
if (!l->pic)
return AVERROR(ENOMEM);
ff_bswapdsp_init(&l->bdsp);
l->last = av_malloc_array(w, 2 * sizeof(*l->last));
if (!l->last)
return AVERROR(ENOMEM);
l->clast = l->last + w;
w += 8;
h += 8;
l->Y_base = av_calloc(w * h, 2 * sizeof(*l->Y_base));
if (!l->Y_base)
return AVERROR(ENOMEM);
l->y_stride = w;
l->Y1 = l->Y_base + l->y_stride * 4 + 4;
l->Y2 = l->Y1 + w * h;
w = (w + 1) >> 1;
h = (h + 1) >> 1;
l->UV_base = av_calloc(w * h, 4 * sizeof(*l->UV_base));
if (!l->UV_base)
return AVERROR(ENOMEM);
l->uv_stride = w;
l->U1 = l->UV_base + l->uv_stride * 2 + 2;
l->U2 = l->U1 + w * h;
l->V1 = l->U2 + w * h;
l->V2 = l->V1 + w * h;
return 0;
}
static av_cold int decode_end(AVCodecContext *avctx)
{
TM2Context * const l = avctx->priv_data;
int i;
av_freep(&l->last);
for (i = 0; i < TM2_NUM_STREAMS; i++)
av_freep(&l->tokens[i]);
av_freep(&l->Y_base);
av_freep(&l->UV_base);
av_freep(&l->buffer);
l->buffer_size = 0;
av_frame_free(&l->pic);
return 0;
}
const AVCodec ff_truemotion2_decoder = {
.name = "truemotion2",
.long_name = NULL_IF_CONFIG_SMALL("Duck TrueMotion 2.0"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_TRUEMOTION2,
.priv_data_size = sizeof(TM2Context),
.init = decode_init,
.close = decode_end,
.decode = decode_frame,
.capabilities = AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP | FF_CODEC_CAP_INIT_THREADSAFE,
};
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