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FFmpeg/libavcodec/aic.c
Andreas Rheinhardt 20f9727018 avcodec/codec_internal: Add FFCodec, hide internal part of AVCodec 
Up until now, codec.h contains both public and private parts
of AVCodec. This exposes the internals of AVCodec to users
and leads them into the temptation of actually using them
and forces us to forward-declare structures and types that
users can't use at all.

This commit changes this by adding a new structure FFCodec to
codec_internal.h that extends AVCodec, i.e. contains the public
AVCodec as first member; the private fields of AVCodec are moved
to this structure, leaving codec.h clean.

Reviewed-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-03-21 01:33:09 +01:00

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/*
* Apple Intermediate Codec decoder
*
* Copyright (c) 2013 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
*/
#include <inttypes.h>
#include "libavutil/mem_internal.h"
#include "avcodec.h"
#include "bytestream.h"
#include "codec_internal.h"
#include "get_bits.h"
#include "golomb.h"
#include "idctdsp.h"
#include "thread.h"
#include "unary.h"
#define AIC_HDR_SIZE 24
#define AIC_BAND_COEFFS (64 + 32 + 192 + 96)
enum AICBands {
COEFF_LUMA = 0,
COEFF_CHROMA,
COEFF_LUMA_EXT,
COEFF_CHROMA_EXT,
NUM_BANDS
};
static const uint8_t aic_num_band_coeffs[NUM_BANDS] = { 64, 32, 192, 96 };
static const uint16_t aic_band_off[NUM_BANDS] = { 0, 64, 96, 288 };
static const uint8_t aic_quant_matrix[64] = {
8, 16, 19, 22, 22, 26, 26, 27,
16, 16, 22, 22, 26, 27, 27, 29,
19, 22, 26, 26, 27, 29, 29, 35,
22, 24, 27, 27, 29, 32, 34, 38,
26, 27, 29, 29, 32, 35, 38, 46,
27, 29, 34, 34, 35, 40, 46, 56,
29, 34, 34, 37, 40, 48, 56, 69,
34, 37, 38, 40, 48, 58, 69, 83,
};
static const uint8_t aic_y_scan[64] = {
0, 4, 1, 2, 5, 8, 12, 9,
6, 3, 7, 10, 13, 14, 11, 15,
47, 43, 46, 45, 42, 39, 35, 38,
41, 44, 40, 37, 34, 33, 36, 32,
16, 20, 17, 18, 21, 24, 28, 25,
22, 19, 23, 26, 29, 30, 27, 31,
63, 59, 62, 61, 58, 55, 51, 54,
57, 60, 56, 53, 50, 49, 52, 48,
};
static const uint8_t aic_y_ext_scan[192] = {
64, 72, 65, 66, 73, 80, 88, 81,
74, 67, 75, 82, 89, 90, 83, 91,
0, 4, 1, 2, 5, 8, 12, 9,
6, 3, 7, 10, 13, 14, 11, 15,
16, 20, 17, 18, 21, 24, 28, 25,
22, 19, 23, 26, 29, 30, 27, 31,
155, 147, 154, 153, 146, 139, 131, 138,
145, 152, 144, 137, 130, 129, 136, 128,
47, 43, 46, 45, 42, 39, 35, 38,
41, 44, 40, 37, 34, 33, 36, 32,
63, 59, 62, 61, 58, 55, 51, 54,
57, 60, 56, 53, 50, 49, 52, 48,
96, 104, 97, 98, 105, 112, 120, 113,
106, 99, 107, 114, 121, 122, 115, 123,
68, 76, 69, 70, 77, 84, 92, 85,
78, 71, 79, 86, 93, 94, 87, 95,
100, 108, 101, 102, 109, 116, 124, 117,
110, 103, 111, 118, 125, 126, 119, 127,
187, 179, 186, 185, 178, 171, 163, 170,
177, 184, 176, 169, 162, 161, 168, 160,
159, 151, 158, 157, 150, 143, 135, 142,
149, 156, 148, 141, 134, 133, 140, 132,
191, 183, 190, 189, 182, 175, 167, 174,
181, 188, 180, 173, 166, 165, 172, 164,
};
static const uint8_t aic_c_scan[64] = {
0, 4, 1, 2, 5, 8, 12, 9,
6, 3, 7, 10, 13, 14, 11, 15,
31, 27, 30, 29, 26, 23, 19, 22,
25, 28, 24, 21, 18, 17, 20, 16,
32, 36, 33, 34, 37, 40, 44, 41,
38, 35, 39, 42, 45, 46, 43, 47,
63, 59, 62, 61, 58, 55, 51, 54,
57, 60, 56, 53, 50, 49, 52, 48,
};
static const uint8_t aic_c_ext_scan[192] = {
16, 24, 17, 18, 25, 32, 40, 33,
26, 19, 27, 34, 41, 42, 35, 43,
0, 4, 1, 2, 5, 8, 12, 9,
6, 3, 7, 10, 13, 14, 11, 15,
20, 28, 21, 22, 29, 36, 44, 37,
30, 23, 31, 38, 45, 46, 39, 47,
95, 87, 94, 93, 86, 79, 71, 78,
85, 92, 84, 77, 70, 69, 76, 68,
63, 59, 62, 61, 58, 55, 51, 54,
57, 60, 56, 53, 50, 49, 52, 48,
91, 83, 90, 89, 82, 75, 67, 74,
81, 88, 80, 73, 66, 65, 72, 64,
112, 120, 113, 114, 121, 128, 136, 129,
122, 115, 123, 130, 137, 138, 131, 139,
96, 100, 97, 98, 101, 104, 108, 105,
102, 99, 103, 106, 109, 110, 107, 111,
116, 124, 117, 118, 125, 132, 140, 133,
126, 119, 127, 134, 141, 142, 135, 143,
191, 183, 190, 189, 182, 175, 167, 174,
181, 188, 180, 173, 166, 165, 172, 164,
159, 155, 158, 157, 154, 151, 147, 150,
153, 156, 152, 149, 146, 145, 148, 144,
187, 179, 186, 185, 178, 171, 163, 170,
177, 184, 176, 169, 162, 161, 168, 160,
};
static const uint8_t * const aic_scan[NUM_BANDS] = {
aic_y_scan, aic_c_scan, aic_y_ext_scan, aic_c_ext_scan
};
typedef struct AICContext {
AVCodecContext *avctx;
AVFrame *frame;
IDCTDSPContext idsp;
ScanTable scantable;
int num_x_slices;
int slice_width;
int mb_width, mb_height;
int quant;
int interlaced;
int16_t *slice_data;
int16_t *data_ptr[NUM_BANDS];
DECLARE_ALIGNED(16, int16_t, block)[64];
DECLARE_ALIGNED(16, uint8_t, quant_matrix)[64];
} AICContext;
static int aic_decode_header(AICContext *ctx, const uint8_t *src, int size)
{
uint32_t frame_size;
int width, height;
if (src[0] != 1) {
av_log(ctx->avctx, AV_LOG_ERROR, "Invalid version %d\n", src[0]);
return AVERROR_INVALIDDATA;
}
if (src[1] != AIC_HDR_SIZE - 2) {
av_log(ctx->avctx, AV_LOG_ERROR, "Invalid header size %d\n", src[1]);
return AVERROR_INVALIDDATA;
}
frame_size = AV_RB32(src + 2);
width = AV_RB16(src + 6);
height = AV_RB16(src + 8);
if (frame_size > size) {
av_log(ctx->avctx, AV_LOG_ERROR, "Frame size should be %"PRIu32" got %d\n",
frame_size, size);
return AVERROR_INVALIDDATA;
}
if (width != ctx->avctx->width || height != ctx->avctx->height) {
av_log(ctx->avctx, AV_LOG_ERROR,
"Picture dimension changed: old: %d x %d, new: %d x %d\n",
ctx->avctx->width, ctx->avctx->height, width, height);
return AVERROR_INVALIDDATA;
}
ctx->quant = src[15];
ctx->interlaced = ((src[16] >> 4) == 3);
return 0;
}
#define GET_CODE(val, type, add_bits) \
do { \
if (type) \
val = get_ue_golomb(gb); \
else \
val = get_unary(gb, 1, 31); \
if (add_bits) \
val = (val << add_bits) + get_bits(gb, add_bits); \
} while (0)
static int aic_decode_coeffs(GetBitContext *gb, int16_t *dst,
int band, int slice_width, int force_chroma)
{
int has_skips, coeff_type, coeff_bits, skip_type, skip_bits;
const int num_coeffs = aic_num_band_coeffs[band];
const uint8_t *scan = aic_scan[band | force_chroma];
int mb, idx;
unsigned val;
if (get_bits_left(gb) < 5)
return AVERROR_INVALIDDATA;
has_skips = get_bits1(gb);
coeff_type = get_bits1(gb);
coeff_bits = get_bits(gb, 3);
if (has_skips) {
skip_type = get_bits1(gb);
skip_bits = get_bits(gb, 3);
for (mb = 0; mb < slice_width; mb++) {
idx = -1;
do {
GET_CODE(val, skip_type, skip_bits);
if (val >= 0x10000)
return AVERROR_INVALIDDATA;
idx += val + 1;
if (idx >= num_coeffs)
break;
GET_CODE(val, coeff_type, coeff_bits);
val++;
if (val >= 0x10000)
return AVERROR_INVALIDDATA;
dst[scan[idx]] = val;
} while (idx < num_coeffs - 1);
dst += num_coeffs;
}
} else {
for (mb = 0; mb < slice_width; mb++) {
for (idx = 0; idx < num_coeffs; idx++) {
GET_CODE(val, coeff_type, coeff_bits);
if (val >= 0x10000)
return AVERROR_INVALIDDATA;
dst[scan[idx]] = val;
}
dst += num_coeffs;
}
}
return 0;
}
static void recombine_block(int16_t *dst, const uint8_t *scan,
int16_t **base, int16_t **ext)
{
int i, j;
for (i = 0; i < 4; i++) {
for (j = 0; j < 4; j++)
dst[scan[i * 8 + j]] = (*base)[j];
for (j = 0; j < 4; j++)
dst[scan[i * 8 + j + 4]] = (*ext)[j];
*base += 4;
*ext += 4;
}
for (; i < 8; i++) {
for (j = 0; j < 8; j++)
dst[scan[i * 8 + j]] = (*ext)[j];
*ext += 8;
}
}
static void recombine_block_il(int16_t *dst, const uint8_t *scan,
int16_t **base, int16_t **ext,
int block_no)
{
int i, j;
if (block_no < 2) {
for (i = 0; i < 8; i++) {
for (j = 0; j < 4; j++)
dst[scan[i * 8 + j]] = (*base)[j];
for (j = 0; j < 4; j++)
dst[scan[i * 8 + j + 4]] = (*ext)[j];
*base += 4;
*ext += 4;
}
} else {
for (i = 0; i < 64; i++)
dst[scan[i]] = (*ext)[i];
*ext += 64;
}
}
static void unquant_block(int16_t *block, int q, uint8_t *quant_matrix)
{
int i;
for (i = 0; i < 64; i++) {
int val = (uint16_t)block[i];
int sign = val & 1;
block[i] = (((val >> 1) ^ -sign) * q * quant_matrix[i] >> 4)
+ sign;
}
}
static int aic_decode_slice(AICContext *ctx, int mb_x, int mb_y,
const uint8_t *src, int src_size)
{
GetBitContext gb;
int ret, i, mb, blk;
int slice_width = FFMIN(ctx->slice_width, ctx->mb_width - mb_x);
int last_row = mb_y && mb_y == ctx->mb_height - 1;
int y_pos, c_pos;
uint8_t *Y, *C[2];
uint8_t *dst;
int16_t *base_y = ctx->data_ptr[COEFF_LUMA];
int16_t *base_c = ctx->data_ptr[COEFF_CHROMA];
int16_t *ext_y = ctx->data_ptr[COEFF_LUMA_EXT];
int16_t *ext_c = ctx->data_ptr[COEFF_CHROMA_EXT];
const int ystride = ctx->frame->linesize[0];
if (last_row) {
y_pos = (ctx->avctx->height - 16);
c_pos = ((ctx->avctx->height+1)/2 - 8);
} else {
y_pos = mb_y * 16;
c_pos = mb_y * 8;
}
Y = ctx->frame->data[0] + mb_x * 16 + y_pos * ystride;
for (i = 0; i < 2; i++)
C[i] = ctx->frame->data[i + 1] + mb_x * 8
+ c_pos * ctx->frame->linesize[i + 1];
init_get_bits(&gb, src, src_size * 8);
memset(ctx->slice_data, 0,
sizeof(*ctx->slice_data) * slice_width * AIC_BAND_COEFFS);
for (i = 0; i < NUM_BANDS; i++)
if ((ret = aic_decode_coeffs(&gb, ctx->data_ptr[i],
i, slice_width,
!ctx->interlaced)) < 0)
return ret;
for (mb = 0; mb < slice_width; mb++) {
for (blk = 0; blk < 4; blk++) {
if (!ctx->interlaced)
recombine_block(ctx->block, ctx->scantable.permutated,
&base_y, &ext_y);
else
recombine_block_il(ctx->block, ctx->scantable.permutated,
&base_y, &ext_y, blk);
unquant_block(ctx->block, ctx->quant, ctx->quant_matrix);
ctx->idsp.idct(ctx->block);
if (!ctx->interlaced) {
dst = Y + (blk >> 1) * 8 * ystride + (blk & 1) * 8;
ctx->idsp.put_signed_pixels_clamped(ctx->block, dst, ystride);
} else {
dst = Y + (blk & 1) * 8 + (blk >> 1) * ystride;
ctx->idsp.put_signed_pixels_clamped(ctx->block, dst,
ystride * 2);
}
}
Y += 16;
for (blk = 0; blk < 2; blk++) {
recombine_block(ctx->block, ctx->scantable.permutated,
&base_c, &ext_c);
unquant_block(ctx->block, ctx->quant, ctx->quant_matrix);
ctx->idsp.idct(ctx->block);
ctx->idsp.put_signed_pixels_clamped(ctx->block, C[blk],
ctx->frame->linesize[blk + 1]);
C[blk] += 8;
}
}
return 0;
}
static int aic_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
AVPacket *avpkt)
{
AICContext *ctx = avctx->priv_data;
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
GetByteContext gb;
uint32_t off;
int x, y, ret;
int slice_size;
ctx->frame = data;
ctx->frame->pict_type = AV_PICTURE_TYPE_I;
ctx->frame->key_frame = 1;
off = FFALIGN(AIC_HDR_SIZE + ctx->num_x_slices * ctx->mb_height * 2, 4);
if (buf_size < off) {
av_log(avctx, AV_LOG_ERROR, "Too small frame\n");
return AVERROR_INVALIDDATA;
}
ret = aic_decode_header(ctx, buf, buf_size);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "Invalid header\n");
return ret;
}
if ((ret = ff_thread_get_buffer(avctx, ctx->frame, 0)) < 0)
return ret;
bytestream2_init(&gb, buf + AIC_HDR_SIZE,
ctx->num_x_slices * ctx->mb_height * 2);
for (y = 0; y < ctx->mb_height; y++) {
for (x = 0; x < ctx->mb_width; x += ctx->slice_width) {
slice_size = bytestream2_get_le16(&gb) * 4;
if (slice_size + off > buf_size || !slice_size) {
av_log(avctx, AV_LOG_ERROR,
"Incorrect slice size %d at %d.%d\n", slice_size, x, y);
return AVERROR_INVALIDDATA;
}
ret = aic_decode_slice(ctx, x, y, buf + off, slice_size);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR,
"Error decoding slice at %d.%d\n", x, y);
return ret;
}
off += slice_size;
}
}
*got_frame = 1;
return avpkt->size;
}
static av_cold int aic_decode_init(AVCodecContext *avctx)
{
AICContext *ctx = avctx->priv_data;
int i;
uint8_t scan[64];
ctx->avctx = avctx;
avctx->pix_fmt = AV_PIX_FMT_YUV420P;
ff_idctdsp_init(&ctx->idsp, avctx);
for (i = 0; i < 64; i++)
scan[i] = i;
ff_init_scantable(ctx->idsp.idct_permutation, &ctx->scantable, scan);
for (i = 0; i < 64; i++)
ctx->quant_matrix[ctx->idsp.idct_permutation[i]] = aic_quant_matrix[i];
ctx->mb_width = FFALIGN(avctx->width, 16) >> 4;
ctx->mb_height = FFALIGN(avctx->height, 16) >> 4;
ctx->num_x_slices = (ctx->mb_width + 15) >> 4;
ctx->slice_width = 16;
for (i = 1; i < ctx->mb_width; i++) {
if (!(ctx->mb_width % i) && (ctx->mb_width / i <= 32)) {
ctx->slice_width = ctx->mb_width / i;
ctx->num_x_slices = i;
break;
}
}
ctx->slice_data = av_malloc_array(ctx->slice_width, AIC_BAND_COEFFS
* sizeof(*ctx->slice_data));
if (!ctx->slice_data) {
av_log(avctx, AV_LOG_ERROR, "Error allocating slice buffer\n");
return AVERROR(ENOMEM);
}
for (i = 0; i < NUM_BANDS; i++)
ctx->data_ptr[i] = ctx->slice_data + ctx->slice_width
* aic_band_off[i];
return 0;
}
static av_cold int aic_decode_close(AVCodecContext *avctx)
{
AICContext *ctx = avctx->priv_data;
av_freep(&ctx->slice_data);
return 0;
}
const FFCodec ff_aic_decoder = {
.p.name = "aic",
.p.long_name = NULL_IF_CONFIG_SMALL("Apple Intermediate Codec"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_AIC,
.priv_data_size = sizeof(AICContext),
.init = aic_decode_init,
.close = aic_decode_close,
.decode = aic_decode_frame,
.p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
};
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