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FFmpeg/libavcodec/aic.c
Paul B Mahol fa3e49568d avcodec/aic: unbreak decoding of files with slice_width != 16 
Signed-off-by: Paul B Mahol <onemda@gmail.com>
2017-02-24 11:35:02 +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 "avcodec.h"
#include "bytestream.h"
#include "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 int aic_num_band_coeffs[NUM_BANDS] = { 64, 32, 192, 96 };
static const int 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;
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);
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];
Y = ctx->frame->data[0] + mb_x * 16 + mb_y * 16 * ystride;
for (i = 0; i < 2; i++)
C[i] = ctx->frame->data[i + 1] + mb_x * 8
+ mb_y * 8 * 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;
ThreadFrame frame = { .f = data };
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, &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;
}
AVCodec ff_aic_decoder = {
.name = "aic",
.long_name = NULL_IF_CONFIG_SMALL("Apple Intermediate Codec"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_AIC,
.priv_data_size = sizeof(AICContext),
.init = aic_decode_init,
.close = aic_decode_close,
.decode = aic_decode_frame,
.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
.init_thread_copy = ONLY_IF_THREADS_ENABLED(aic_decode_init),
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
};
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