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GCC Code Coverage Report

Directory:	../../../ffmpeg/		Exec	Total	Coverage
File:	src/libavcodec/eatgq.c	Lines:	125	139	89.9 %
Date:	2020-01-29 01:05:39	Branches:	40	53	75.5 %


/*
 * Electronic Arts TGQ Video Decoder
 * Copyright (c) 2007-2008 Peter Ross <pross@xvid.org>
 *
 * 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 St, Fifth Floor, Boston, MA  02110-1301  USA
 */

/**
 * @file
 * Electronic Arts TGQ Video Decoder
 * @author Peter Ross <pross@xvid.org>
 *
 * Technical details here:
 * http://wiki.multimedia.cx/index.php?title=Electronic_Arts_TGQ
 */

#define BITSTREAM_READER_LE
#include "aandcttab.h"
#include "avcodec.h"
#include "bytestream.h"
#include "eaidct.h"
#include "get_bits.h"
#include "idctdsp.h"
#include "internal.h"

typedef struct TgqContext {
    AVCodecContext *avctx;
    int width, height;
    ScanTable scantable;
    int qtable[64];
    DECLARE_ALIGNED(16, int16_t, block)[6][64];
    GetByteContext gb;
} TgqContext;

static av_cold int tgq_decode_init(AVCodecContext *avctx)
{
    TgqContext *s = avctx->priv_data;
    uint8_t idct_permutation[64];
    s->avctx = avctx;
    ff_init_scantable_permutation(idct_permutation, FF_IDCT_PERM_NONE);
    ff_init_scantable(idct_permutation, &s->scantable, ff_zigzag_direct);
    avctx->framerate = (AVRational){ 15, 1 };
    avctx->pix_fmt   = AV_PIX_FMT_YUV420P;
    return 0;
}

static void tgq_decode_block(TgqContext *s, int16_t block[64], GetBitContext *gb)
{
    uint8_t *perm = s->scantable.permutated;
    int i, j, value;
    block[0] = get_sbits(gb, 8) * s->qtable[0];
    for (i = 1; i < 64;) {
        switch (show_bits(gb, 3)) {
        case 4:
            block[perm[i++]] = 0;
        case 0:
            block[perm[i++]] = 0;
            skip_bits(gb, 3);
            break;
        case 5:
        case 1:
            skip_bits(gb, 2);
            value = get_bits(gb, 6);
            for (j = 0; j < value; j++)
                block[perm[i++]] = 0;
            break;
        case 6:
            skip_bits(gb, 3);
            block[perm[i]] = -s->qtable[perm[i]];
            i++;
            break;
        case 2:
            skip_bits(gb, 3);
            block[perm[i]] = s->qtable[perm[i]];
            i++;
            break;
        case 7: // 111b
        case 3: // 011b
            skip_bits(gb, 2);
            if (show_bits(gb, 6) == 0x3F) {
                skip_bits(gb, 6);
                block[perm[i]] = get_sbits(gb, 8) * s->qtable[perm[i]];
            } else {
                block[perm[i]] = get_sbits(gb, 6) * s->qtable[perm[i]];
            }
            i++;
            break;
        }
    }
    block[0] += 128 << 4;
}

static void tgq_idct_put_mb(TgqContext *s, int16_t (*block)[64], AVFrame *frame,
                            int mb_x, int mb_y)
{
    ptrdiff_t linesize = frame->linesize[0];
    uint8_t *dest_y  = frame->data[0] + (mb_y * 16 * linesize)           + mb_x * 16;
    uint8_t *dest_cb = frame->data[1] + (mb_y * 8  * frame->linesize[1]) + mb_x * 8;
    uint8_t *dest_cr = frame->data[2] + (mb_y * 8  * frame->linesize[2]) + mb_x * 8;

    ff_ea_idct_put_c(dest_y                   , linesize, block[0]);
    ff_ea_idct_put_c(dest_y                + 8, linesize, block[1]);
    ff_ea_idct_put_c(dest_y + 8 * linesize    , linesize, block[2]);
    ff_ea_idct_put_c(dest_y + 8 * linesize + 8, linesize, block[3]);
    if (!(s->avctx->flags & AV_CODEC_FLAG_GRAY)) {
         ff_ea_idct_put_c(dest_cb, frame->linesize[1], block[4]);
         ff_ea_idct_put_c(dest_cr, frame->linesize[2], block[5]);
    }
}

static inline void tgq_dconly(TgqContext *s, unsigned char *dst,
                              ptrdiff_t dst_stride, int dc)
{
    int level = av_clip_uint8((dc*s->qtable[0] + 2056) >> 4);
    int j;
    for (j = 0; j < 8; j++)
        memset(dst + j * dst_stride, level, 8);
}

static void tgq_idct_put_mb_dconly(TgqContext *s, AVFrame *frame,
                                   int mb_x, int mb_y, const int8_t *dc)
{
    ptrdiff_t linesize = frame->linesize[0];
    uint8_t *dest_y  = frame->data[0] + (mb_y * 16 * linesize)             + mb_x * 16;
    uint8_t *dest_cb = frame->data[1] + (mb_y * 8  * frame->linesize[1]) + mb_x * 8;
    uint8_t *dest_cr = frame->data[2] + (mb_y * 8  * frame->linesize[2]) + mb_x * 8;
    tgq_dconly(s, dest_y,                    linesize, dc[0]);
    tgq_dconly(s, dest_y                + 8, linesize, dc[1]);
    tgq_dconly(s, dest_y + 8 * linesize,     linesize, dc[2]);
    tgq_dconly(s, dest_y + 8 * linesize + 8, linesize, dc[3]);
    if (!(s->avctx->flags & AV_CODEC_FLAG_GRAY)) {
        tgq_dconly(s, dest_cb, frame->linesize[1], dc[4]);
        tgq_dconly(s, dest_cr, frame->linesize[2], dc[5]);
    }
}

static int tgq_decode_mb(TgqContext *s, AVFrame *frame, int mb_y, int mb_x)
{
    int mode;
    int i;
    int8_t dc[6];

    mode = bytestream2_get_byte(&s->gb);
    if (mode > 12) {
        GetBitContext gb;
        int ret = init_get_bits8(&gb, s->gb.buffer, FFMIN(bytestream2_get_bytes_left(&s->gb), mode));
        if (ret < 0)
            return ret;

        for (i = 0; i < 6; i++)
            tgq_decode_block(s, s->block[i], &gb);
        tgq_idct_put_mb(s, s->block, frame, mb_x, mb_y);
        bytestream2_skip(&s->gb, mode);
    } else {
        if (mode == 3) {
            memset(dc, bytestream2_get_byte(&s->gb), 4);
            dc[4] = bytestream2_get_byte(&s->gb);
            dc[5] = bytestream2_get_byte(&s->gb);
        } else if (mode == 6) {
            bytestream2_get_buffer(&s->gb, dc, 6);
        } else if (mode == 12) {
            for (i = 0; i < 6; i++) {
                dc[i] = bytestream2_get_byte(&s->gb);
                bytestream2_skip(&s->gb, 1);
            }
        } else {
            av_log(s->avctx, AV_LOG_ERROR, "unsupported mb mode %i\n", mode);
            return -1;
        }
        tgq_idct_put_mb_dconly(s, frame, mb_x, mb_y, dc);
    }
    return 0;
}

static void tgq_calculate_qtable(TgqContext *s, int quant)
{
    int i, j;
    const int a = (14 * (100 - quant)) / 100 + 1;
    const int b = (11 * (100 - quant)) / 100 + 4;
    for (j = 0; j < 8; j++)
        for (i = 0; i < 8; i++)
            s->qtable[j * 8 + i] = ((a * (j + i) / (7 + 7) + b) *
                                    ff_inv_aanscales[j * 8 + i]) >> (14 - 4);
}

static int tgq_decode_frame(AVCodecContext *avctx,
                            void *data, int *got_frame,
                            AVPacket *avpkt)
{
    const uint8_t *buf = avpkt->data;
    int buf_size       = avpkt->size;
    TgqContext *s      = avctx->priv_data;
    AVFrame *frame     = data;
    int x, y, ret;
    int big_endian;

    if (buf_size < 16) {
        av_log(avctx, AV_LOG_WARNING, "truncated header\n");
        return AVERROR_INVALIDDATA;
    }
    big_endian = AV_RL32(&buf[4]) > 0x000FFFFF;
    bytestream2_init(&s->gb, buf + 8, buf_size - 8);
    if (big_endian) {
        s->width  = bytestream2_get_be16u(&s->gb);
        s->height = bytestream2_get_be16u(&s->gb);
    } else {
        s->width  = bytestream2_get_le16u(&s->gb);
        s->height = bytestream2_get_le16u(&s->gb);
    }

    ret = ff_set_dimensions(s->avctx, s->width, s->height);
    if (ret < 0)
        return ret;

    tgq_calculate_qtable(s, bytestream2_get_byteu(&s->gb));
    bytestream2_skip(&s->gb, 3);

    if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
        return ret;
    frame->key_frame = 1;
    frame->pict_type = AV_PICTURE_TYPE_I;

    for (y = 0; y < FFALIGN(avctx->height, 16) >> 4; y++)
        for (x = 0; x < FFALIGN(avctx->width, 16) >> 4; x++)
            if (tgq_decode_mb(s, frame, y, x) < 0)
                return AVERROR_INVALIDDATA;

    *got_frame = 1;

    return avpkt->size;
}

AVCodec ff_eatgq_decoder = {
    .name           = "eatgq",
    .long_name      = NULL_IF_CONFIG_SMALL("Electronic Arts TGQ video"),
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_TGQ,
    .priv_data_size = sizeof(TgqContext),
    .init           = tgq_decode_init,
    .decode         = tgq_decode_frame,
    .capabilities   = AV_CODEC_CAP_DR1,
};


Generated by: GCOVR (Version 4.1)

Line	Branch	Exec	Source
1			/*
2			* Electronic Arts TGQ Video Decoder
3			* Copyright (c) 2007-2008 Peter Ross <pross@xvid.org>
4			*
5			* This file is part of FFmpeg.
6			*
7			* FFmpeg is free software; you can redistribute it and/or
8			* modify it under the terms of the GNU Lesser General Public
9			* License as published by the Free Software Foundation; either
10			* version 2.1 of the License, or (at your option) any later version.
11			*
12			* FFmpeg is distributed in the hope that it will be useful,
13			* but WITHOUT ANY WARRANTY; without even the implied warranty of
14			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15			* Lesser General Public License for more details.
16			*
17			* You should have received a copy of the GNU Lesser General Public
18			* License along with FFmpeg; if not, write to the Free Software
19			* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20			*/
21
22			/**
23			* @file
24			* Electronic Arts TGQ Video Decoder
25			* @author Peter Ross <pross@xvid.org>
26			*
27			* Technical details here:
28			* http://wiki.multimedia.cx/index.php?title=Electronic_Arts_TGQ
29			*/
30
31			#define BITSTREAM_READER_LE
32			#include "aandcttab.h"
33			#include "avcodec.h"
34			#include "bytestream.h"
35			#include "eaidct.h"
36			#include "get_bits.h"
37			#include "idctdsp.h"
38			#include "internal.h"
39
40			typedef struct TgqContext {
41			AVCodecContext *avctx;
42			int width, height;
43			ScanTable scantable;
44			int qtable[64];
45			DECLARE_ALIGNED(16, int16_t, block)[6][64];
46			GetByteContext gb;
47			} TgqContext;
48
49		2	static av_cold int tgq_decode_init(AVCodecContext *avctx)
50			{
51		2	TgqContext *s = avctx->priv_data;
52			uint8_t idct_permutation[64];
53		2	s->avctx = avctx;
54		2	ff_init_scantable_permutation(idct_permutation, FF_IDCT_PERM_NONE);
55		2	ff_init_scantable(idct_permutation, &s->scantable, ff_zigzag_direct);
56		2	avctx->framerate = (AVRational){ 15, 1 };
57		2	avctx->pix_fmt = AV_PIX_FMT_YUV420P;
58		2	return 0;
59			}
60
61		101826	static void tgq_decode_block(TgqContext s, int16_t block[64], GetBitContext gb)
62			{
63		101826	uint8_t *perm = s->scantable.permutated;
64			int i, j, value;
65		101826	block[0] = get_sbits(gb, 8) * s->qtable[0];
66		101826	for (i = 1; i < 64;) {
67	✓✓✓✓ ✓✓✗	1463527	switch (show_bits(gb, 3)) {
68		152397	case 4:
69		152397	block[perm[i++]] = 0;
70		370656	case 0:
71		370656	block[perm[i++]] = 0;
72		370656	skip_bits(gb, 3);
73		370656	break;
74		148778	case 5:
75			case 1:
76		148778	skip_bits(gb, 2);
77		148778	value = get_bits(gb, 6);
78	✓✓	5096670	for (j = 0; j < value; j++)
79		4947892	block[perm[i++]] = 0;
80		148778	break;
81		333783	case 6:
82		333783	skip_bits(gb, 3);
83		333783	block[perm[i]] = -s->qtable[perm[i]];
84		333783	i++;
85		333783	break;
86		339292	case 2:
87		339292	skip_bits(gb, 3);
88		339292	block[perm[i]] = s->qtable[perm[i]];
89		339292	i++;
90		339292	break;
91		271018	case 7: // 111b
92			case 3: // 011b
93		271018	skip_bits(gb, 2);
94	✓✓	271018	if (show_bits(gb, 6) == 0x3F) {
95		1440	skip_bits(gb, 6);
96		1440	block[perm[i]] = get_sbits(gb, 8) * s->qtable[perm[i]];
97			} else {
98		269578	block[perm[i]] = get_sbits(gb, 6) * s->qtable[perm[i]];
99			}
100		271018	i++;
101		271018	break;
102			}
103	✓✓	1565353	}
104		101826	block[0] += 128 << 4;
105		101826	}
106
107		16971	static void tgq_idct_put_mb(TgqContext s, int16_t (block)[64], AVFrame *frame,
108			int mb_x, int mb_y)
109			{
110		16971	ptrdiff_t linesize = frame->linesize[0];
111		16971	uint8_t dest_y = frame->data[0] + (mb_y 16 * linesize) + mb_x * 16;
112		16971	uint8_t dest_cb = frame->data[1] + (mb_y 8 * frame->linesize[1]) + mb_x * 8;
113		16971	uint8_t dest_cr = frame->data[2] + (mb_y 8 * frame->linesize[2]) + mb_x * 8;
114
115		16971	ff_ea_idct_put_c(dest_y , linesize, block[0]);
116		16971	ff_ea_idct_put_c(dest_y + 8, linesize, block[1]);
117		16971	ff_ea_idct_put_c(dest_y + 8 * linesize , linesize, block[2]);
118		16971	ff_ea_idct_put_c(dest_y + 8 * linesize + 8, linesize, block[3]);
119	✓✗	16971	if (!(s->avctx->flags & AV_CODEC_FLAG_GRAY)) {
120		16971	ff_ea_idct_put_c(dest_cb, frame->linesize[1], block[4]);
121		16971	ff_ea_idct_put_c(dest_cr, frame->linesize[2], block[5]);
122			}
123		16971	}
124
125		50508	static inline void tgq_dconly(TgqContext s, unsigned char dst,
126			ptrdiff_t dst_stride, int dc)
127			{
128		50508	int level = av_clip_uint8((dc*s->qtable[0] + 2056) >> 4);
129			int j;
130	✓✓	454572	for (j = 0; j < 8; j++)
131		404064	memset(dst + j * dst_stride, level, 8);
132		50508	}
133
134		8418	static void tgq_idct_put_mb_dconly(TgqContext s, AVFrame frame,
135			int mb_x, int mb_y, const int8_t *dc)
136			{
137		8418	ptrdiff_t linesize = frame->linesize[0];
138		8418	uint8_t dest_y = frame->data[0] + (mb_y 16 * linesize) + mb_x * 16;
139		8418	uint8_t dest_cb = frame->data[1] + (mb_y 8 * frame->linesize[1]) + mb_x * 8;
140		8418	uint8_t dest_cr = frame->data[2] + (mb_y 8 * frame->linesize[2]) + mb_x * 8;
141		8418	tgq_dconly(s, dest_y, linesize, dc[0]);
142		8418	tgq_dconly(s, dest_y + 8, linesize, dc[1]);
143		8418	tgq_dconly(s, dest_y + 8 * linesize, linesize, dc[2]);
144		8418	tgq_dconly(s, dest_y + 8 * linesize + 8, linesize, dc[3]);
145	✓✗	8418	if (!(s->avctx->flags & AV_CODEC_FLAG_GRAY)) {
146		8418	tgq_dconly(s, dest_cb, frame->linesize[1], dc[4]);
147		8418	tgq_dconly(s, dest_cr, frame->linesize[2], dc[5]);
148			}
149		8418	}
150
151		25389	static int tgq_decode_mb(TgqContext s, AVFrame frame, int mb_y, int mb_x)
152			{
153			int mode;
154			int i;
155			int8_t dc[6];
156
157		25389	mode = bytestream2_get_byte(&s->gb);
158	✓✓	25389	if (mode > 12) {
159			GetBitContext gb;
160	✗✓	16971	int ret = init_get_bits8(&gb, s->gb.buffer, FFMIN(bytestream2_get_bytes_left(&s->gb), mode));
161	✗✓	16971	if (ret < 0)
162			return ret;
163
164	✓✓	118797	for (i = 0; i < 6; i++)
165		101826	tgq_decode_block(s, s->block[i], &gb);
166		16971	tgq_idct_put_mb(s, s->block, frame, mb_x, mb_y);
167		16971	bytestream2_skip(&s->gb, mode);
168			} else {
169	✗✓	8418	if (mode == 3) {
170			memset(dc, bytestream2_get_byte(&s->gb), 4);
171			dc[4] = bytestream2_get_byte(&s->gb);
172			dc[5] = bytestream2_get_byte(&s->gb);
173	✗✓	8418	} else if (mode == 6) {
174			bytestream2_get_buffer(&s->gb, dc, 6);
175	✓✗	8418	} else if (mode == 12) {
176	✓✓	58926	for (i = 0; i < 6; i++) {
177		50508	dc[i] = bytestream2_get_byte(&s->gb);
178		50508	bytestream2_skip(&s->gb, 1);
179			}
180			} else {
181			av_log(s->avctx, AV_LOG_ERROR, "unsupported mb mode %i\n", mode);
182			return -1;
183			}
184		8418	tgq_idct_put_mb_dconly(s, frame, mb_x, mb_y, dc);
185			}
186		25389	return 0;
187			}
188
189		279	static void tgq_calculate_qtable(TgqContext *s, int quant)
190			{
191			int i, j;
192		279	const int a = (14 * (100 - quant)) / 100 + 1;
193		279	const int b = (11 * (100 - quant)) / 100 + 4;
194	✓✓	2511	for (j = 0; j < 8; j++)
195	✓✓	20088	for (i = 0; i < 8; i++)
196		17856	s->qtable[j * 8 + i] = ((a * (j + i) / (7 + 7) + b) *
197		17856	ff_inv_aanscales[j * 8 + i]) >> (14 - 4);
198		279	}
199
200		279	static int tgq_decode_frame(AVCodecContext *avctx,
201			void data, int got_frame,
202			AVPacket *avpkt)
203			{
204		279	const uint8_t *buf = avpkt->data;
205		279	int buf_size = avpkt->size;
206		279	TgqContext *s = avctx->priv_data;
207		279	AVFrame *frame = data;
208			int x, y, ret;
209			int big_endian;
210
211	✗✓	279	if (buf_size < 16) {
212			av_log(avctx, AV_LOG_WARNING, "truncated header\n");
213			return AVERROR_INVALIDDATA;
214			}
215		279	big_endian = AV_RL32(&buf[4]) > 0x000FFFFF;
216		279	bytestream2_init(&s->gb, buf + 8, buf_size - 8);
217	✓✗	279	if (big_endian) {
218		279	s->width = bytestream2_get_be16u(&s->gb);
219		279	s->height = bytestream2_get_be16u(&s->gb);
220			} else {
221			s->width = bytestream2_get_le16u(&s->gb);
222			s->height = bytestream2_get_le16u(&s->gb);
223			}
224
225		279	ret = ff_set_dimensions(s->avctx, s->width, s->height);
226	✗✓	279	if (ret < 0)
227			return ret;
228
229		279	tgq_calculate_qtable(s, bytestream2_get_byteu(&s->gb));
230		279	bytestream2_skip(&s->gb, 3);
231
232	✗✓	279	if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
233			return ret;
234		279	frame->key_frame = 1;
235		279	frame->pict_type = AV_PICTURE_TYPE_I;
236
237	✓✓	2232	for (y = 0; y < FFALIGN(avctx->height, 16) >> 4; y++)
238	✓✓	27342	for (x = 0; x < FFALIGN(avctx->width, 16) >> 4; x++)
239	✗✓	25389	if (tgq_decode_mb(s, frame, y, x) < 0)
240			return AVERROR_INVALIDDATA;
241
242		279	*got_frame = 1;
243
244		279	return avpkt->size;
245			}
246
247			AVCodec ff_eatgq_decoder = {
248			.name = "eatgq",
249			.long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TGQ video"),
250			.type = AVMEDIA_TYPE_VIDEO,
251			.id = AV_CODEC_ID_TGQ,
252			.priv_data_size = sizeof(TgqContext),
253			.init = tgq_decode_init,
254			.decode = tgq_decode_frame,
255			.capabilities = AV_CODEC_CAP_DR1,
256			};