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third_party_ffmpeg/libavcodec/aic.c
Vittorio Giovara e878ec0d47 aic: Fix decoding files with odd dimensions 
Normally the aic decoder finds the proper slice combination (multiple of
some number less than 32) but in case of odd width, it resorts to the
default values, which were actually swapped.
The number of slices is modified to account for such odd width cases.

CC: libav-stable@libav.org
2015-03-03 15:08:15 +00:00

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/*
* Apple Intermediate Codec decoder
*
* Copyright (c) 2013 Konstantin Shishkov
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; 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 "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 *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];
} 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, 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 < 0)
return AVERROR_INVALIDDATA;
idx += val + 1;
if (idx >= num_coeffs)
break;
GET_CODE(val, coeff_type, coeff_bits);
val++;
if (val >= 0x10000 || val < 0)
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 || val < 0)
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)
{
int i;
for (i = 0; i < 64; i++) {
int val = (uint16_t)block[i];
int sign = val & 1;
block[i] = (((val >> 1) ^ -sign) * q * aic_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->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->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;
}
if ((ret = aic_decode_header(ctx, buf, buf_size)) < 0)
return ret;
if ((ret = ff_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\n");
return AVERROR_INVALIDDATA;
}
if ((ret = aic_decode_slice(ctx, x, y,
buf + off, slice_size)) < 0)
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);
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 < 32; 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(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 = CODEC_CAP_DR1,
};
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