[deb_ffmpeg.git] / ffmpeg / libavcodec / mdec.c

/*
 * Sony PlayStation MDEC (Motion DECoder)
 * Copyright (c) 2003 Michael Niedermayer
 *
 * based upon code from Sebastian Jedruszkiewicz <elf@frogger.rules.pl>
 *
 * 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
 */

/**
 * @file
 * Sony PlayStation MDEC (Motion DECoder)
 * This is very similar to intra-only MPEG-1.
 */

#include "avcodec.h"
#include "blockdsp.h"
#include "bswapdsp.h"
#include "idctdsp.h"
#include "mpegvideo.h"
#include "mpeg12.h"
#include "thread.h"

typedef struct MDECContext {
    AVCodecContext *avctx;
    BlockDSPContext bdsp;
    BswapDSPContext bbdsp;
    IDCTDSPContext idsp;
    ThreadFrame frame;
    GetBitContext gb;
    ScanTable scantable;
    int version;
    int qscale;
    int last_dc[3];
    int mb_width;
    int mb_height;
    int mb_x, mb_y;
    DECLARE_ALIGNED(16, int16_t, block)[6][64];
    uint8_t *bitstream_buffer;
    unsigned int bitstream_buffer_size;
    int block_last_index[6];
} MDECContext;

//very similar to MPEG-1
static inline int mdec_decode_block_intra(MDECContext *a, int16_t *block, int n)
{
    int level, diff, i, j, run;
    int component;
    RLTable *rl = &ff_rl_mpeg1;
    uint8_t * const scantable = a->scantable.permutated;
    const uint16_t *quant_matrix = ff_mpeg1_default_intra_matrix;
    const int qscale = a->qscale;

    /* DC coefficient */
    if (a->version == 2) {
        block[0] = 2 * get_sbits(&a->gb, 10) + 1024;
    } else {
        component = (n <= 3 ? 0 : n - 4 + 1);
        diff = decode_dc(&a->gb, component);
        if (diff >= 0xffff)
            return AVERROR_INVALIDDATA;
        a->last_dc[component] += diff;
        block[0] = a->last_dc[component] << 3;
    }

    i = 0;
    {
        OPEN_READER(re, &a->gb);
        /* now quantify & encode AC coefficients */
        for (;;) {
            UPDATE_CACHE(re, &a->gb);
            GET_RL_VLC(level, run, re, &a->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);

            if (level == 127) {
                break;
            } else if (level != 0) {
                i    += run;
                j     = scantable[i];
                level = (level * qscale * quant_matrix[j]) >> 3;
                level = (level ^ SHOW_SBITS(re, &a->gb, 1)) - SHOW_SBITS(re, &a->gb, 1);
                LAST_SKIP_BITS(re, &a->gb, 1);
            } else {
                /* escape */
                run = SHOW_UBITS(re, &a->gb, 6)+1; LAST_SKIP_BITS(re, &a->gb, 6);
                UPDATE_CACHE(re, &a->gb);
                level = SHOW_SBITS(re, &a->gb, 10); SKIP_BITS(re, &a->gb, 10);
                i    += run;
                j     = scantable[i];
                if (level < 0) {
                    level = -level;
                    level = (level * qscale * quant_matrix[j]) >> 3;
                    level = (level - 1) | 1;
                    level = -level;
                } else {
                    level = (level * qscale * quant_matrix[j]) >> 3;
                    level = (level - 1) | 1;
                }
            }
            if (i > 63) {
                av_log(a->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", a->mb_x, a->mb_y);
                return AVERROR_INVALIDDATA;
            }

            block[j] = level;
        }
        CLOSE_READER(re, &a->gb);
    }
    a->block_last_index[n] = i;
    return 0;
}

static inline int decode_mb(MDECContext *a, int16_t block[6][64])
{
    int i, ret;
    static const int block_index[6] = { 5, 4, 0, 1, 2, 3 };

    a->bdsp.clear_blocks(block[0]);

    for (i = 0; i < 6; i++) {
        if ((ret = mdec_decode_block_intra(a, block[block_index[i]],
                                           block_index[i])) < 0)
            return ret;
        if (get_bits_left(&a->gb) < 0)
            return AVERROR_INVALIDDATA;
    }
    return 0;
}

static inline void idct_put(MDECContext *a, AVFrame *frame, int mb_x, int mb_y)
{
    int16_t (*block)[64] = a->block;
    int 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;

    a->idsp.idct_put(dest_y,                    linesize, block[0]);
    a->idsp.idct_put(dest_y + 8,                linesize, block[1]);
    a->idsp.idct_put(dest_y + 8 * linesize,     linesize, block[2]);
    a->idsp.idct_put(dest_y + 8 * linesize + 8, linesize, block[3]);

    if (!(a->avctx->flags & CODEC_FLAG_GRAY)) {
        a->idsp.idct_put(dest_cb, frame->linesize[1], block[4]);
        a->idsp.idct_put(dest_cr, frame->linesize[2], block[5]);
    }
}

static int decode_frame(AVCodecContext *avctx,
                        void *data, int *got_frame,
                        AVPacket *avpkt)
{
    MDECContext * const a = avctx->priv_data;
    const uint8_t *buf    = avpkt->data;
    int buf_size          = avpkt->size;
    ThreadFrame frame     = { .f = data };
    int ret;

    if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
        return ret;
    frame.f->pict_type = AV_PICTURE_TYPE_I;
    frame.f->key_frame = 1;

    av_fast_padded_malloc(&a->bitstream_buffer, &a->bitstream_buffer_size, buf_size);
    if (!a->bitstream_buffer)
        return AVERROR(ENOMEM);
    a->bbdsp.bswap16_buf((uint16_t *)a->bitstream_buffer, (uint16_t *)buf, (buf_size + 1) / 2);
    if ((ret = init_get_bits8(&a->gb, a->bitstream_buffer, buf_size)) < 0)
        return ret;

    /* skip over 4 preamble bytes in stream (typically 0xXX 0xXX 0x00 0x38) */
    skip_bits(&a->gb, 32);

    a->qscale  = get_bits(&a->gb, 16);
    a->version = get_bits(&a->gb, 16);

    a->last_dc[0] = a->last_dc[1] = a->last_dc[2] = 128;

    for (a->mb_x = 0; a->mb_x < a->mb_width; a->mb_x++) {
        for (a->mb_y = 0; a->mb_y < a->mb_height; a->mb_y++) {
            if ((ret = decode_mb(a, a->block)) < 0)
                return ret;

            idct_put(a, frame.f, a->mb_x, a->mb_y);
        }
    }

    *got_frame = 1;

    return (get_bits_count(&a->gb) + 31) / 32 * 4;
}

static av_cold int decode_init(AVCodecContext *avctx)
{
    MDECContext * const a = avctx->priv_data;

    a->mb_width  = (avctx->coded_width  + 15) / 16;
    a->mb_height = (avctx->coded_height + 15) / 16;

    a->avctx           = avctx;

    ff_blockdsp_init(&a->bdsp, avctx);
    ff_bswapdsp_init(&a->bbdsp);
    ff_idctdsp_init(&a->idsp, avctx);
    ff_mpeg12_init_vlcs();
    ff_init_scantable(a->idsp.idct_permutation, &a->scantable,
                      ff_zigzag_direct);

    if (avctx->idct_algo == FF_IDCT_AUTO)
        avctx->idct_algo = FF_IDCT_SIMPLE;
    avctx->pix_fmt  = AV_PIX_FMT_YUVJ420P;
    avctx->color_range = AVCOL_RANGE_JPEG;

    return 0;
}

static av_cold int decode_init_thread_copy(AVCodecContext *avctx)
{
    MDECContext * const a = avctx->priv_data;

    a->avctx           = avctx;

    return 0;
}

static av_cold int decode_end(AVCodecContext *avctx)
{
    MDECContext * const a = avctx->priv_data;

    av_freep(&a->bitstream_buffer);
    a->bitstream_buffer_size = 0;

    return 0;
}

AVCodec ff_mdec_decoder = {
    .name             = "mdec",
    .long_name        = NULL_IF_CONFIG_SMALL("Sony PlayStation MDEC (Motion DECoder)"),
    .type             = AVMEDIA_TYPE_VIDEO,
    .id               = AV_CODEC_ID_MDEC,
    .priv_data_size   = sizeof(MDECContext),
    .init             = decode_init,
    .close            = decode_end,
    .decode           = decode_frame,
    .capabilities     = CODEC_CAP_DR1 | CODEC_CAP_FRAME_THREADS,
    .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy)
};
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* Sony PlayStation MDEC (Motion DECoder)
	3	* Copyright (c) 2003 Michael Niedermayer
	4	*
	5	* based upon code from Sebastian Jedruszkiewicz <elf@frogger.rules.pl>
	6	*
	7	* This file is part of FFmpeg.
	8	*
	9	* FFmpeg is free software; you can redistribute it and/or
	10	* modify it under the terms of the GNU Lesser General Public
	11	* License as published by the Free Software Foundation; either
	12	* version 2.1 of the License, or (at your option) any later version.
	13	*
	14	* FFmpeg is distributed in the hope that it will be useful,
	15	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	17	* Lesser General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU Lesser General Public
	20	* License along with FFmpeg; if not, write to the Free Software
	21	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	22	*/
	23
	24	/**
	25	* @file
	26	* Sony PlayStation MDEC (Motion DECoder)
	27	* This is very similar to intra-only MPEG-1.
	28	*/
	29
	30	#include "avcodec.h"
	31	#include "blockdsp.h"
	32	#include "bswapdsp.h"
	33	#include "idctdsp.h"
	34	#include "mpegvideo.h"
	35	#include "mpeg12.h"
	36	#include "thread.h"
	37
	38	typedef struct MDECContext {
	39	AVCodecContext *avctx;
	40	BlockDSPContext bdsp;
	41	BswapDSPContext bbdsp;
	42	IDCTDSPContext idsp;
	43	ThreadFrame frame;
	44	GetBitContext gb;
	45	ScanTable scantable;
	46	int version;
	47	int qscale;
	48	int last_dc[3];
	49	int mb_width;
	50	int mb_height;
	51	int mb_x, mb_y;
	52	DECLARE_ALIGNED(16, int16_t, block)[6][64];
	53	uint8_t *bitstream_buffer;
	54	unsigned int bitstream_buffer_size;
	55	int block_last_index[6];
	56	} MDECContext;
	57
	58	//very similar to MPEG-1
	59	static inline int mdec_decode_block_intra(MDECContext a, int16_t block, int n)
	60	{
	61	int level, diff, i, j, run;
	62	int component;
	63	RLTable *rl = &ff_rl_mpeg1;
	64	uint8_t * const scantable = a->scantable.permutated;
65	const uint16_t *quant_matrix = ff_mpeg1_default_intra_matrix;
66	const int qscale = a->qscale;
67
68	/* DC coefficient */
69	if (a->version == 2) {
70	block[0] = 2 * get_sbits(&a->gb, 10) + 1024;
71	} else {
72	component = (n <= 3 ? 0 : n - 4 + 1);
73	diff = decode_dc(&a->gb, component);
74	if (diff >= 0xffff)
75	return AVERROR_INVALIDDATA;
76	a->last_dc[component] += diff;
77	block[0] = a->last_dc[component] << 3;
78	}
79
80	i = 0;
81	{
82	OPEN_READER(re, &a->gb);
83	/* now quantify & encode AC coefficients */
84	for (;;) {
85	UPDATE_CACHE(re, &a->gb);
86	GET_RL_VLC(level, run, re, &a->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
87
88	if (level == 127) {
89	break;
90	} else if (level != 0) {
91	i += run;
92	j = scantable[i];
93	level = (level * qscale * quant_matrix[j]) >> 3;
94	level = (level ^ SHOW_SBITS(re, &a->gb, 1)) - SHOW_SBITS(re, &a->gb, 1);
95	LAST_SKIP_BITS(re, &a->gb, 1);
96	} else {
97	/* escape */
98	run = SHOW_UBITS(re, &a->gb, 6)+1; LAST_SKIP_BITS(re, &a->gb, 6);
99	UPDATE_CACHE(re, &a->gb);
100	level = SHOW_SBITS(re, &a->gb, 10); SKIP_BITS(re, &a->gb, 10);
101	i += run;
102	j = scantable[i];
103	if (level < 0) {
104	level = -level;
105	level = (level * qscale * quant_matrix[j]) >> 3;
106	level = (level - 1) \| 1;
107	level = -level;
108	} else {
109	level = (level * qscale * quant_matrix[j]) >> 3;
110	level = (level - 1) \| 1;
111	}
112	}
113	if (i > 63) {
114	av_log(a->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", a->mb_x, a->mb_y);
115	return AVERROR_INVALIDDATA;
116	}
117
118	block[j] = level;
119	}
120	CLOSE_READER(re, &a->gb);
121	}
122	a->block_last_index[n] = i;
123	return 0;
124	}
125
126	static inline int decode_mb(MDECContext *a, int16_t block[6][64])
127	{
128	int i, ret;
129	static const int block_index[6] = { 5, 4, 0, 1, 2, 3 };
130
131	a->bdsp.clear_blocks(block[0]);
132
133	for (i = 0; i < 6; i++) {
134	if ((ret = mdec_decode_block_intra(a, block[block_index[i]],
135	block_index[i])) < 0)
136	return ret;
137	if (get_bits_left(&a->gb) < 0)
138	return AVERROR_INVALIDDATA;
139	}
140	return 0;
141	}
142
143	static inline void idct_put(MDECContext a, AVFrame frame, int mb_x, int mb_y)
144	{
145	int16_t (*block)[64] = a->block;
146	int linesize = frame->linesize[0];
147
148	uint8_t dest_y = frame->data[0] + (mb_y 16* linesize ) + mb_x * 16;
149	uint8_t dest_cb = frame->data[1] + (mb_y 8 * frame->linesize[1]) + mb_x * 8;
150	uint8_t dest_cr = frame->data[2] + (mb_y 8 * frame->linesize[2]) + mb_x * 8;
151
152	a->idsp.idct_put(dest_y, linesize, block[0]);
153	a->idsp.idct_put(dest_y + 8, linesize, block[1]);
154	a->idsp.idct_put(dest_y + 8 * linesize, linesize, block[2]);
155	a->idsp.idct_put(dest_y + 8 * linesize + 8, linesize, block[3]);
156
157	if (!(a->avctx->flags & CODEC_FLAG_GRAY)) {
158	a->idsp.idct_put(dest_cb, frame->linesize[1], block[4]);
159	a->idsp.idct_put(dest_cr, frame->linesize[2], block[5]);
160	}
161	}
162
163	static int decode_frame(AVCodecContext *avctx,
164	void data, int got_frame,
165	AVPacket *avpkt)
166	{
167	MDECContext * const a = avctx->priv_data;
168	const uint8_t *buf = avpkt->data;
169	int buf_size = avpkt->size;
170	ThreadFrame frame = { .f = data };
171	int ret;
172
173	if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
174	return ret;
175	frame.f->pict_type = AV_PICTURE_TYPE_I;
176	frame.f->key_frame = 1;
177
178	av_fast_padded_malloc(&a->bitstream_buffer, &a->bitstream_buffer_size, buf_size);
179	if (!a->bitstream_buffer)
180	return AVERROR(ENOMEM);
181	a->bbdsp.bswap16_buf((uint16_t )a->bitstream_buffer, (uint16_t )buf, (buf_size + 1) / 2);
182	if ((ret = init_get_bits8(&a->gb, a->bitstream_buffer, buf_size)) < 0)
183	return ret;
184
185	/* skip over 4 preamble bytes in stream (typically 0xXX 0xXX 0x00 0x38) */
186	skip_bits(&a->gb, 32);
187
188	a->qscale = get_bits(&a->gb, 16);
189	a->version = get_bits(&a->gb, 16);
190
191	a->last_dc[0] = a->last_dc[1] = a->last_dc[2] = 128;
192
193	for (a->mb_x = 0; a->mb_x < a->mb_width; a->mb_x++) {
194	for (a->mb_y = 0; a->mb_y < a->mb_height; a->mb_y++) {
195	if ((ret = decode_mb(a, a->block)) < 0)
196	return ret;
197
198	idct_put(a, frame.f, a->mb_x, a->mb_y);
199	}
200	}
201
202	*got_frame = 1;
203
204	return (get_bits_count(&a->gb) + 31) / 32 * 4;
205	}
206
207	static av_cold int decode_init(AVCodecContext *avctx)
208	{
209	MDECContext * const a = avctx->priv_data;
210
211	a->mb_width = (avctx->coded_width + 15) / 16;
212	a->mb_height = (avctx->coded_height + 15) / 16;
213
214	a->avctx = avctx;
215
216	ff_blockdsp_init(&a->bdsp, avctx);
217	ff_bswapdsp_init(&a->bbdsp);
218	ff_idctdsp_init(&a->idsp, avctx);
219	ff_mpeg12_init_vlcs();
220	ff_init_scantable(a->idsp.idct_permutation, &a->scantable,
221	ff_zigzag_direct);
222
223	if (avctx->idct_algo == FF_IDCT_AUTO)
224	avctx->idct_algo = FF_IDCT_SIMPLE;
225	avctx->pix_fmt = AV_PIX_FMT_YUVJ420P;
226	avctx->color_range = AVCOL_RANGE_JPEG;
227
228	return 0;
229	}
230
231	static av_cold int decode_init_thread_copy(AVCodecContext *avctx)
232	{
233	MDECContext * const a = avctx->priv_data;
234
235	a->avctx = avctx;
236
237	return 0;
238	}
239
240	static av_cold int decode_end(AVCodecContext *avctx)
241	{
242	MDECContext * const a = avctx->priv_data;
243
244	av_freep(&a->bitstream_buffer);
245	a->bitstream_buffer_size = 0;
246
247	return 0;
248	}
249
250	AVCodec ff_mdec_decoder = {
251	.name = "mdec",
252	.long_name = NULL_IF_CONFIG_SMALL("Sony PlayStation MDEC (Motion DECoder)"),
253	.type = AVMEDIA_TYPE_VIDEO,
254	.id = AV_CODEC_ID_MDEC,
255	.priv_data_size = sizeof(MDECContext),
256	.init = decode_init,
257	.close = decode_end,
258	.decode = decode_frame,
259	.capabilities = CODEC_CAP_DR1 \| CODEC_CAP_FRAME_THREADS,
260	.init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy)
261	};