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FFmpeg/libavcodec/mimic.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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/*
* Copyright (C) 2005 Ole André Vadla Ravnås <oleavr@gmail.com>
* Copyright (C) 2008 Ramiro Polla
*
* 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 <stdlib.h>
#include <string.h>
#include <stdint.h>
#include "libavutil/mem_internal.h"
#include "libavutil/thread.h"
#include "avcodec.h"
#include "blockdsp.h"
#include "internal.h"
#include "get_bits.h"
#include "bytestream.h"
#include "bswapdsp.h"
#include "hpeldsp.h"
#include "idctdsp.h"
#include "thread.h"
#define MIMIC_HEADER_SIZE 20
#define MIMIC_VLC_BITS 11
typedef struct MimicContext {
AVCodecContext *avctx;
int num_vblocks[3];
int num_hblocks[3];
void *swap_buf;
int swap_buf_size;
int cur_index;
int prev_index;
ThreadFrame frames [16];
DECLARE_ALIGNED(32, int16_t, dct_block)[64];
GetBitContext gb;
ScanTable scantable;
BlockDSPContext bdsp;
BswapDSPContext bbdsp;
HpelDSPContext hdsp;
IDCTDSPContext idsp;
/* Kept in the context so multithreading can have a constant to read from */
int next_cur_index;
int next_prev_index;
} MimicContext;
static VLC block_vlc;
static const uint8_t huffsyms[] = {
0x10, 0x20, 0x30, 0x00, 0x11, 0x40, 0x50, 0x12, 0x13, 0x21, 0x31, 0x60,
0x14, 0x15, 0x16, 0x22, 0x41, 0x17, 0x18, 0x23, 0x24, 0x25, 0x32, 0x42,
0x51, 0x61, 0x70, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x26, 0x27,
0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x33, 0x34, 0x35, 0x36, 0x37,
0x38, 0x39, 0x3A, 0x3B, 0x3C, 0x3D, 0x3E, 0x43, 0x44, 0x45, 0x46, 0x47,
0x48, 0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x52, 0x53, 0x54, 0x55, 0x56,
0x57, 0x58, 0x59, 0x5A, 0x5B, 0x5C, 0x5D, 0x5E, 0x62, 0x63, 0x64, 0x65,
0x66, 0x67, 0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x71, 0x72, 0x73,
0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A, 0x7B, 0x7C, 0x7D, 0x7E,
};
static const uint8_t huffbits[] = {
2, 2, 3, 4, 4, 4, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7, 8, 8,
8, 8, 9, 9, 9, 9, 10, 10, 10, 10, 11, 11, 11, 11, 12, 12, 12, 12,
13, 13, 13, 13, 14, 14, 14, 14, 15, 15, 15, 15, 16, 16, 16, 16, 17, 17,
17, 17, 18, 18, 18, 18, 19, 19, 19, 19, 20, 20, 20, 20, 21, 21, 21, 21,
22, 22, 22, 22, 23, 23, 23, 23, 24, 24, 24, 24, 25, 25, 25, 25, 26, 26,
26, 26, 27, 27, 27, 27, 28, 28, 28, 28, 29, 29, 29, 29, 30, 30, 30,
};
static const uint8_t col_zag[64] = {
0, 8, 1, 2, 9, 16, 24, 17,
10, 3, 4, 11, 18, 25, 32, 40,
33, 26, 19, 12, 5, 6, 13, 20,
27, 34, 41, 48, 56, 49, 42, 35,
28, 21, 14, 7, 15, 22, 29, 36,
43, 50, 57, 58, 51, 44, 37, 30,
23, 31, 38, 45, 52, 59, 39, 46,
53, 60, 61, 54, 47, 55, 62, 63,
};
static av_cold int mimic_decode_end(AVCodecContext *avctx)
{
MimicContext *ctx = avctx->priv_data;
int i;
av_freep(&ctx->swap_buf);
ctx->swap_buf_size = 0;
for (i = 0; i < FF_ARRAY_ELEMS(ctx->frames); i++) {
if (ctx->frames[i].f)
ff_thread_release_buffer(avctx, &ctx->frames[i]);
av_frame_free(&ctx->frames[i].f);
}
return 0;
}
static av_cold void mimic_init_static(void)
{
INIT_VLC_STATIC_FROM_LENGTHS(&block_vlc, MIMIC_VLC_BITS, FF_ARRAY_ELEMS(huffbits),
huffbits, 1, huffsyms, 1, 1, 0, 0, 4368);
}
static av_cold int mimic_decode_init(AVCodecContext *avctx)
{
static AVOnce init_static_once = AV_ONCE_INIT;
MimicContext *ctx = avctx->priv_data;
int i;
ctx->prev_index = 0;
ctx->cur_index = 15;
ff_blockdsp_init(&ctx->bdsp, avctx);
ff_bswapdsp_init(&ctx->bbdsp);
ff_hpeldsp_init(&ctx->hdsp, avctx->flags);
ff_idctdsp_init(&ctx->idsp, avctx);
ff_init_scantable(ctx->idsp.idct_permutation, &ctx->scantable, col_zag);
for (i = 0; i < FF_ARRAY_ELEMS(ctx->frames); i++) {
ctx->frames[i].f = av_frame_alloc();
if (!ctx->frames[i].f)
return AVERROR(ENOMEM);
}
ff_thread_once(&init_static_once, mimic_init_static);
return 0;
}
#if HAVE_THREADS
static int mimic_decode_update_thread_context(AVCodecContext *avctx, const AVCodecContext *avctx_from)
{
MimicContext *dst = avctx->priv_data, *src = avctx_from->priv_data;
int i, ret;
if (avctx == avctx_from)
return 0;
dst->cur_index = src->next_cur_index;
dst->prev_index = src->next_prev_index;
for (i = 0; i < FF_ARRAY_ELEMS(dst->frames); i++) {
ff_thread_release_buffer(avctx, &dst->frames[i]);
if (i != src->next_cur_index && src->frames[i].f->data[0]) {
ret = ff_thread_ref_frame(&dst->frames[i], &src->frames[i]);
if (ret < 0)
return ret;
}
}
return 0;
}
#endif
static const int8_t vlcdec_lookup[9][64] = {
{ 0, },
{ -1, 1, },
{ -3, 3, -2, 2, },
{ -7, 7, -6, 6, -5, 5, -4, 4, },
{ -15, 15, -14, 14, -13, 13, -12, 12,
-11, 11, -10, 10, -9, 9, -8, 8, },
{ -31, 31, -30, 30, -29, 29, -28, 28,
-27, 27, -26, 26, -25, 25, -24, 24,
-23, 23, -22, 22, -21, 21, -20, 20,
-19, 19, -18, 18, -17, 17, -16, 16, },
{ -63, 63, -62, 62, -61, 61, -60, 60,
-59, 59, -58, 58, -57, 57, -56, 56,
-55, 55, -54, 54, -53, 53, -52, 52,
-51, 51, -50, 50, -49, 49, -48, 48,
-47, 47, -46, 46, -45, 45, -44, 44,
-43, 43, -42, 42, -41, 41, -40, 40,
-39, 39, -38, 38, -37, 37, -36, 36,
-35, 35, -34, 34, -33, 33, -32, 32, },
{ -127, 127, -126, 126, -125, 125, -124, 124,
-123, 123, -122, 122, -121, 121, -120, 120,
-119, 119, -118, 118, -117, 117, -116, 116,
-115, 115, -114, 114, -113, 113, -112, 112,
-111, 111, -110, 110, -109, 109, -108, 108,
-107, 107, -106, 106, -105, 105, -104, 104,
-103, 103, -102, 102, -101, 101, -100, 100,
-99, 99, -98, 98, -97, 97, -96, 96, },
{ -95, 95, -94, 94, -93, 93, -92, 92,
-91, 91, -90, 90, -89, 89, -88, 88,
-87, 87, -86, 86, -85, 85, -84, 84,
-83, 83, -82, 82, -81, 81, -80, 80,
-79, 79, -78, 78, -77, 77, -76, 76,
-75, 75, -74, 74, -73, 73, -72, 72,
-71, 71, -70, 70, -69, 69, -68, 68,
-67, 67, -66, 66, -65, 65, -64, 64, },
};
static int vlc_decode_block(MimicContext *ctx, int num_coeffs, int qscale)
{
int16_t *block = ctx->dct_block;
unsigned int pos;
ctx->bdsp.clear_block(block);
block[0] = get_bits(&ctx->gb, 8) << 3;
for (pos = 1; pos < num_coeffs; pos++) {
uint32_t vlc, num_bits;
int value;
int coeff;
vlc = get_vlc2(&ctx->gb, block_vlc.table, MIMIC_VLC_BITS, 3);
if (!vlc) /* end-of-block code */
return 0;
if (vlc == -1)
return AVERROR_INVALIDDATA;
/* pos_add and num_bits are coded in the vlc code */
pos += vlc & 15; // pos_add
num_bits = vlc >> 4; // num_bits
if (pos >= 64)
return AVERROR_INVALIDDATA;
value = get_bits(&ctx->gb, num_bits);
/* FFmpeg's IDCT behaves somewhat different from the original code, so
* a factor of 4 was added to the input */
coeff = ((int8_t*)vlcdec_lookup[num_bits])[value];
if (pos < 3)
coeff *= 16;
else /* TODO Use >> 10 instead of / 1001 */
coeff = (coeff * qscale) / 1001;
block[ctx->scantable.permutated[pos]] = coeff;
}
return 0;
}
static int decode(MimicContext *ctx, int quality, int num_coeffs,
int is_iframe)
{
int ret, y, x, plane, cur_row = 0;
for (plane = 0; plane < 3; plane++) {
const int is_chroma = !!plane;
const int qscale = av_clip(10000 - quality, is_chroma ? 1000 : 2000,
10000) << 2;
const int stride = ctx->frames[ctx->cur_index ].f->linesize[plane];
const uint8_t *src = ctx->frames[ctx->prev_index].f->data[plane];
uint8_t *dst = ctx->frames[ctx->cur_index ].f->data[plane];
for (y = 0; y < ctx->num_vblocks[plane]; y++) {
for (x = 0; x < ctx->num_hblocks[plane]; x++) {
/* Check for a change condition in the current block.
* - iframes always change.
* - Luma plane changes on get_bits1 == 0
* - Chroma planes change on get_bits1 == 1 */
if (is_iframe || get_bits1(&ctx->gb) == is_chroma) {
/* Luma planes may use a backreference from the 15 last
* frames preceding the previous. (get_bits1 == 1)
* Chroma planes don't use backreferences. */
if (is_chroma || is_iframe || !get_bits1(&ctx->gb)) {
if ((ret = vlc_decode_block(ctx, num_coeffs,
qscale)) < 0) {
av_log(ctx->avctx, AV_LOG_ERROR, "Error decoding "
"block.\n");
return ret;
}
ctx->idsp.idct_put(dst, stride, ctx->dct_block);
} else {
unsigned int backref = get_bits(&ctx->gb, 4);
int index = (ctx->cur_index + backref) & 15;
uint8_t *p = ctx->frames[index].f->data[0];
if (index != ctx->cur_index && p) {
ff_thread_await_progress(&ctx->frames[index],
cur_row, 0);
p += src -
ctx->frames[ctx->prev_index].f->data[plane];
ctx->hdsp.put_pixels_tab[1][0](dst, p, stride, 8);
} else {
av_log(ctx->avctx, AV_LOG_ERROR,
"No such backreference! Buggy sample.\n");
}
}
} else {
ff_thread_await_progress(&ctx->frames[ctx->prev_index],
cur_row, 0);
ctx->hdsp.put_pixels_tab[1][0](dst, src, stride, 8);
}
src += 8;
dst += 8;
}
src += (stride - ctx->num_hblocks[plane]) << 3;
dst += (stride - ctx->num_hblocks[plane]) << 3;
ff_thread_report_progress(&ctx->frames[ctx->cur_index],
cur_row++, 0);
}
}
return 0;
}
/**
* Flip the buffer upside-down and put it in the YVU order to revert the
* way Mimic encodes frames.
*/
static void flip_swap_frame(AVFrame *f)
{
int i;
uint8_t *data_1 = f->data[1];
f->data[0] = f->data[0] + ( f->height - 1) * f->linesize[0];
f->data[1] = f->data[2] + ((f->height >> 1) - 1) * f->linesize[2];
f->data[2] = data_1 + ((f->height >> 1) - 1) * f->linesize[1];
for (i = 0; i < 3; i++)
f->linesize[i] *= -1;
}
static int mimic_decode_frame(AVCodecContext *avctx, void *data,
int *got_frame, AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
int swap_buf_size = buf_size - MIMIC_HEADER_SIZE;
MimicContext *ctx = avctx->priv_data;
GetByteContext gb;
int is_pframe;
int width, height;
int quality, num_coeffs;
int res;
if (buf_size <= MIMIC_HEADER_SIZE) {
av_log(avctx, AV_LOG_ERROR, "insufficient data\n");
return AVERROR_INVALIDDATA;
}
bytestream2_init(&gb, buf, MIMIC_HEADER_SIZE);
bytestream2_skip(&gb, 2); /* some constant (always 256) */
quality = bytestream2_get_le16u(&gb);
width = bytestream2_get_le16u(&gb);
height = bytestream2_get_le16u(&gb);
bytestream2_skip(&gb, 4); /* some constant */
is_pframe = bytestream2_get_le32u(&gb);
num_coeffs = bytestream2_get_byteu(&gb);
bytestream2_skip(&gb, 3); /* some constant */
if (!ctx->avctx) {
int i;
if (!(width == 160 && height == 120) &&
!(width == 320 && height == 240)) {
av_log(avctx, AV_LOG_ERROR, "invalid width/height!\n");
return AVERROR_INVALIDDATA;
}
res = ff_set_dimensions(avctx, width, height);
if (res < 0)
return res;
ctx->avctx = avctx;
avctx->pix_fmt = AV_PIX_FMT_YUV420P;
for (i = 0; i < 3; i++) {
ctx->num_vblocks[i] = AV_CEIL_RSHIFT(height, 3 + !!i);
ctx->num_hblocks[i] = width >> (3 + !!i);
}
} else if (width != ctx->avctx->width || height != ctx->avctx->height) {
avpriv_request_sample(avctx, "Resolution changing");
return AVERROR_PATCHWELCOME;
}
if (is_pframe && !ctx->frames[ctx->prev_index].f->data[0]) {
av_log(avctx, AV_LOG_ERROR, "decoding must start with keyframe\n");
return AVERROR_INVALIDDATA;
}
ff_thread_release_buffer(avctx, &ctx->frames[ctx->cur_index]);
ctx->frames[ctx->cur_index].f->pict_type = is_pframe ? AV_PICTURE_TYPE_P :
AV_PICTURE_TYPE_I;
if ((res = ff_thread_get_buffer(avctx, &ctx->frames[ctx->cur_index],
AV_GET_BUFFER_FLAG_REF)) < 0)
return res;
ctx->next_prev_index = ctx->cur_index;
ctx->next_cur_index = (ctx->cur_index - 1) & 15;
ff_thread_finish_setup(avctx);
av_fast_padded_malloc(&ctx->swap_buf, &ctx->swap_buf_size, swap_buf_size);
if (!ctx->swap_buf)
return AVERROR(ENOMEM);
ctx->bbdsp.bswap_buf(ctx->swap_buf,
(const uint32_t *) (buf + MIMIC_HEADER_SIZE),
swap_buf_size >> 2);
init_get_bits(&ctx->gb, ctx->swap_buf, swap_buf_size << 3);
res = decode(ctx, quality, num_coeffs, !is_pframe);
ff_thread_report_progress(&ctx->frames[ctx->cur_index], INT_MAX, 0);
if (res < 0) {
if (!(avctx->active_thread_type & FF_THREAD_FRAME))
ff_thread_release_buffer(avctx, &ctx->frames[ctx->cur_index]);
return res;
}
if ((res = av_frame_ref(data, ctx->frames[ctx->cur_index].f)) < 0)
return res;
*got_frame = 1;
flip_swap_frame(data);
ctx->prev_index = ctx->next_prev_index;
ctx->cur_index = ctx->next_cur_index;
return buf_size;
}
const AVCodec ff_mimic_decoder = {
.name = "mimic",
.long_name = NULL_IF_CONFIG_SMALL("Mimic"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_MIMIC,
.priv_data_size = sizeof(MimicContext),
.init = mimic_decode_init,
.close = mimic_decode_end,
.decode = mimic_decode_frame,
.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
.update_thread_context = ONLY_IF_THREADS_ENABLED(mimic_decode_update_thread_context),
.caps_internal = FF_CODEC_CAP_ALLOCATE_PROGRESS |
FF_CODEC_CAP_INIT_CLEANUP | FF_CODEC_CAP_INIT_THREADSAFE,
};
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