FFmpeg coverage

GCC Code Coverage Report

Directory:	../../../ffmpeg/		Exec	Total	Coverage
File:	src/libavcodec/eatgq.c	Lines:	125	139	89.9 %
Date:	2021-04-18 21:26:34	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 "libavutil/mem_internal.h"

#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 4.2)

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
33			#include "libavutil/mem_internal.h"
34
35			#include "aandcttab.h"
36			#include "avcodec.h"
37			#include "bytestream.h"
38			#include "eaidct.h"
39			#include "get_bits.h"
40			#include "idctdsp.h"
41			#include "internal.h"
42
43			typedef struct TgqContext {
44			AVCodecContext *avctx;
45			int width, height;
46			ScanTable scantable;
47			int qtable[64];
48			DECLARE_ALIGNED(16, int16_t, block)[6][64];
49			GetByteContext gb;
50			} TgqContext;
51
52		2	static av_cold int tgq_decode_init(AVCodecContext *avctx)
53			{
54		2	TgqContext *s = avctx->priv_data;
55			uint8_t idct_permutation[64];
56		2	s->avctx = avctx;
57		2	ff_init_scantable_permutation(idct_permutation, FF_IDCT_PERM_NONE);
58		2	ff_init_scantable(idct_permutation, &s->scantable, ff_zigzag_direct);
59		2	avctx->framerate = (AVRational){ 15, 1 };
60		2	avctx->pix_fmt = AV_PIX_FMT_YUV420P;
61		2	return 0;
62			}
63
64		101826	static void tgq_decode_block(TgqContext s, int16_t block[64], GetBitContext gb)
65			{
66		101826	uint8_t *perm = s->scantable.permutated;
67			int i, j, value;
68		101826	block[0] = get_sbits(gb, 8) * s->qtable[0];
69		101826	for (i = 1; i < 64;) {
70	✓✓✓✓ ✓✓✗	1463527	switch (show_bits(gb, 3)) {
71		152397	case 4:
72		152397	block[perm[i++]] = 0;
73		370656	case 0:
74		370656	block[perm[i++]] = 0;
75		370656	skip_bits(gb, 3);
76		370656	break;
77		148778	case 5:
78			case 1:
79		148778	skip_bits(gb, 2);
80		148778	value = get_bits(gb, 6);
81	✓✓	5096670	for (j = 0; j < value; j++)
82		4947892	block[perm[i++]] = 0;
83		148778	break;
84		333783	case 6:
85		333783	skip_bits(gb, 3);
86		333783	block[perm[i]] = -s->qtable[perm[i]];
87		333783	i++;
88		333783	break;
89		339292	case 2:
90		339292	skip_bits(gb, 3);
91		339292	block[perm[i]] = s->qtable[perm[i]];
92		339292	i++;
93		339292	break;
94		271018	case 7: // 111b
95			case 3: // 011b
96		271018	skip_bits(gb, 2);
97	✓✓	271018	if (show_bits(gb, 6) == 0x3F) {
98		1440	skip_bits(gb, 6);
99		1440	block[perm[i]] = get_sbits(gb, 8) * s->qtable[perm[i]];
100			} else {
101		269578	block[perm[i]] = get_sbits(gb, 6) * s->qtable[perm[i]];
102			}
103		271018	i++;
104		271018	break;
105			}
106	✓✓	1565353	}
107		101826	block[0] += 128 << 4;
108		101826	}
109
110		16971	static void tgq_idct_put_mb(TgqContext s, int16_t (block)[64], AVFrame *frame,
111			int mb_x, int mb_y)
112			{
113		16971	ptrdiff_t linesize = frame->linesize[0];
114		16971	uint8_t dest_y = frame->data[0] + (mb_y 16 * linesize) + mb_x * 16;
115		16971	uint8_t dest_cb = frame->data[1] + (mb_y 8 * frame->linesize[1]) + mb_x * 8;
116		16971	uint8_t dest_cr = frame->data[2] + (mb_y 8 * frame->linesize[2]) + mb_x * 8;
117
118		16971	ff_ea_idct_put_c(dest_y , linesize, block[0]);
119		16971	ff_ea_idct_put_c(dest_y + 8, linesize, block[1]);
120		16971	ff_ea_idct_put_c(dest_y + 8 * linesize , linesize, block[2]);
121		16971	ff_ea_idct_put_c(dest_y + 8 * linesize + 8, linesize, block[3]);
122	✓✗	16971	if (!(s->avctx->flags & AV_CODEC_FLAG_GRAY)) {
123		16971	ff_ea_idct_put_c(dest_cb, frame->linesize[1], block[4]);
124		16971	ff_ea_idct_put_c(dest_cr, frame->linesize[2], block[5]);
125			}
126		16971	}
127
128		50508	static inline void tgq_dconly(TgqContext s, unsigned char dst,
129			ptrdiff_t dst_stride, int dc)
130			{
131		50508	int level = av_clip_uint8((dc*s->qtable[0] + 2056) >> 4);
132			int j;
133	✓✓	454572	for (j = 0; j < 8; j++)
134		404064	memset(dst + j * dst_stride, level, 8);
135		50508	}
136
137		8418	static void tgq_idct_put_mb_dconly(TgqContext s, AVFrame frame,
138			int mb_x, int mb_y, const int8_t *dc)
139			{
140		8418	ptrdiff_t linesize = frame->linesize[0];
141		8418	uint8_t dest_y = frame->data[0] + (mb_y 16 * linesize) + mb_x * 16;
142		8418	uint8_t dest_cb = frame->data[1] + (mb_y 8 * frame->linesize[1]) + mb_x * 8;
143		8418	uint8_t dest_cr = frame->data[2] + (mb_y 8 * frame->linesize[2]) + mb_x * 8;
144		8418	tgq_dconly(s, dest_y, linesize, dc[0]);
145		8418	tgq_dconly(s, dest_y + 8, linesize, dc[1]);
146		8418	tgq_dconly(s, dest_y + 8 * linesize, linesize, dc[2]);
147		8418	tgq_dconly(s, dest_y + 8 * linesize + 8, linesize, dc[3]);
148	✓✗	8418	if (!(s->avctx->flags & AV_CODEC_FLAG_GRAY)) {
149		8418	tgq_dconly(s, dest_cb, frame->linesize[1], dc[4]);
150		8418	tgq_dconly(s, dest_cr, frame->linesize[2], dc[5]);
151			}
152		8418	}
153
154		25389	static int tgq_decode_mb(TgqContext s, AVFrame frame, int mb_y, int mb_x)
155			{
156			int mode;
157			int i;
158			int8_t dc[6];
159
160		25389	mode = bytestream2_get_byte(&s->gb);
161	✓✓	25389	if (mode > 12) {
162			GetBitContext gb;
163	✗✓	16971	int ret = init_get_bits8(&gb, s->gb.buffer, FFMIN(bytestream2_get_bytes_left(&s->gb), mode));
164	✗✓	16971	if (ret < 0)
165			return ret;
166
167	✓✓	118797	for (i = 0; i < 6; i++)
168		101826	tgq_decode_block(s, s->block[i], &gb);
169		16971	tgq_idct_put_mb(s, s->block, frame, mb_x, mb_y);
170		16971	bytestream2_skip(&s->gb, mode);
171			} else {
172	✗✓	8418	if (mode == 3) {
173			memset(dc, bytestream2_get_byte(&s->gb), 4);
174			dc[4] = bytestream2_get_byte(&s->gb);
175			dc[5] = bytestream2_get_byte(&s->gb);
176	✗✓	8418	} else if (mode == 6) {
177			bytestream2_get_buffer(&s->gb, dc, 6);
178	✓✗	8418	} else if (mode == 12) {
179	✓✓	58926	for (i = 0; i < 6; i++) {
180		50508	dc[i] = bytestream2_get_byte(&s->gb);
181		50508	bytestream2_skip(&s->gb, 1);
182			}
183			} else {
184			av_log(s->avctx, AV_LOG_ERROR, "unsupported mb mode %i\n", mode);
185			return -1;
186			}
187		8418	tgq_idct_put_mb_dconly(s, frame, mb_x, mb_y, dc);
188			}
189		25389	return 0;
190			}
191
192		279	static void tgq_calculate_qtable(TgqContext *s, int quant)
193			{
194			int i, j;
195		279	const int a = (14 * (100 - quant)) / 100 + 1;
196		279	const int b = (11 * (100 - quant)) / 100 + 4;
197	✓✓	2511	for (j = 0; j < 8; j++)
198	✓✓	20088	for (i = 0; i < 8; i++)
199		17856	s->qtable[j * 8 + i] = ((a * (j + i) / (7 + 7) + b) *
200		17856	ff_inv_aanscales[j * 8 + i]) >> (14 - 4);
201		279	}
202
203		279	static int tgq_decode_frame(AVCodecContext *avctx,
204			void data, int got_frame,
205			AVPacket *avpkt)
206			{
207		279	const uint8_t *buf = avpkt->data;
208		279	int buf_size = avpkt->size;
209		279	TgqContext *s = avctx->priv_data;
210		279	AVFrame *frame = data;
211			int x, y, ret;
212			int big_endian;
213
214	✗✓	279	if (buf_size < 16) {
215			av_log(avctx, AV_LOG_WARNING, "truncated header\n");
216			return AVERROR_INVALIDDATA;
217			}
218		279	big_endian = AV_RL32(&buf[4]) > 0x000FFFFF;
219		279	bytestream2_init(&s->gb, buf + 8, buf_size - 8);
220	✓✗	279	if (big_endian) {
221		279	s->width = bytestream2_get_be16u(&s->gb);
222		279	s->height = bytestream2_get_be16u(&s->gb);
223			} else {
224			s->width = bytestream2_get_le16u(&s->gb);
225			s->height = bytestream2_get_le16u(&s->gb);
226			}
227
228		279	ret = ff_set_dimensions(s->avctx, s->width, s->height);
229	✗✓	279	if (ret < 0)
230			return ret;
231
232		279	tgq_calculate_qtable(s, bytestream2_get_byteu(&s->gb));
233		279	bytestream2_skip(&s->gb, 3);
234
235	✗✓	279	if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
236			return ret;
237		279	frame->key_frame = 1;
238		279	frame->pict_type = AV_PICTURE_TYPE_I;
239
240	✓✓	2232	for (y = 0; y < FFALIGN(avctx->height, 16) >> 4; y++)
241	✓✓	27342	for (x = 0; x < FFALIGN(avctx->width, 16) >> 4; x++)
242	✗✓	25389	if (tgq_decode_mb(s, frame, y, x) < 0)
243			return AVERROR_INVALIDDATA;
244
245		279	*got_frame = 1;
246
247		279	return avpkt->size;
248			}
249
250			AVCodec ff_eatgq_decoder = {
251			.name = "eatgq",
252			.long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TGQ video"),
253			.type = AVMEDIA_TYPE_VIDEO,
254			.id = AV_CODEC_ID_TGQ,
255			.priv_data_size = sizeof(TgqContext),
256			.init = tgq_decode_init,
257			.decode = tgq_decode_frame,
258			.capabilities = AV_CODEC_CAP_DR1,
259			};