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

/*
 * Delphine Software International CIN video decoder
 * Copyright (c) 2006 Gregory Montoir (cyx@users.sourceforge.net)
 *
 * 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
 * Delphine Software International CIN video decoder
 */

#include "avcodec.h"
#include "bytestream.h"
#include "internal.h"

typedef enum CinVideoBitmapIndex {
    CIN_CUR_BMP = 0, /* current */
    CIN_PRE_BMP = 1, /* previous */
    CIN_INT_BMP = 2  /* intermediate */
} CinVideoBitmapIndex;

typedef struct CinVideoContext {
    AVCodecContext *avctx;
    AVFrame *frame;
    unsigned int bitmap_size;
    uint32_t palette[256];
    uint8_t *bitmap_table[3];
} CinVideoContext;

static av_cold void destroy_buffers(CinVideoContext *cin)
{
    int i;

    for (i = 0; i < 3; ++i)
        av_freep(&cin->bitmap_table[i]);
}

static av_cold int allocate_buffers(CinVideoContext *cin)
{
    int i;

    for (i = 0; i < 3; ++i) {
        cin->bitmap_table[i] = av_mallocz(cin->bitmap_size);
        if (!cin->bitmap_table[i]) {
            av_log(cin->avctx, AV_LOG_ERROR, "Can't allocate bitmap buffers.\n");
            destroy_buffers(cin);
            return AVERROR(ENOMEM);
        }
    }

    return 0;
}

static av_cold int cinvideo_decode_init(AVCodecContext *avctx)
{
    CinVideoContext *cin = avctx->priv_data;

    cin->avctx = avctx;
    avctx->pix_fmt = AV_PIX_FMT_PAL8;

    cin->frame = av_frame_alloc();
    if (!cin->frame)
        return AVERROR(ENOMEM);

    cin->bitmap_size = avctx->width * avctx->height;
    if (allocate_buffers(cin))
        return AVERROR(ENOMEM);

    return 0;
}

static void cin_apply_delta_data(const unsigned char *src, unsigned char *dst,
                                 int size)
{
    while (size--)
        *dst++ += *src++;
}

static int cin_decode_huffman(const unsigned char *src, int src_size,
                              unsigned char *dst, int dst_size)
{
    int b, huff_code = 0;
    unsigned char huff_code_table[15];
    unsigned char *dst_cur       = dst;
    unsigned char *dst_end       = dst + dst_size;
    const unsigned char *src_end = src + src_size;

    memcpy(huff_code_table, src, 15);
    src += 15;

    while (src < src_end) {
        huff_code = *src++;
        if ((huff_code >> 4) == 15) {
            b          = huff_code << 4;
            huff_code  = *src++;
            *dst_cur++ = b | (huff_code >> 4);
        } else
            *dst_cur++ = huff_code_table[huff_code >> 4];
        if (dst_cur >= dst_end)
            break;

        huff_code &= 15;
        if (huff_code == 15) {
            *dst_cur++ = *src++;
        } else
            *dst_cur++ = huff_code_table[huff_code];
        if (dst_cur >= dst_end)
            break;
    }

    return dst_cur - dst;
}

static int cin_decode_lzss(const unsigned char *src, int src_size,
                           unsigned char *dst, int dst_size)
{
    uint16_t cmd;
    int i, sz, offset, code;
    unsigned char *dst_end       = dst + dst_size, *dst_start = dst;
    const unsigned char *src_end = src + src_size;

    while (src < src_end && dst < dst_end) {
        code = *src++;
        for (i = 0; i < 8 && src < src_end && dst < dst_end; ++i) {
            if (code & (1 << i)) {
                *dst++ = *src++;
            } else {
                cmd    = AV_RL16(src);
                src   += 2;
                offset = cmd >> 4;
                if ((int)(dst - dst_start) < offset + 1)
                    return AVERROR_INVALIDDATA;
                sz = (cmd & 0xF) + 2;
                /* don't use memcpy/memmove here as the decoding routine
                 * (ab)uses buffer overlappings to repeat bytes in the
                 * destination */
                sz = FFMIN(sz, dst_end - dst);
                while (sz--) {
                    *dst = *(dst - offset - 1);
                    ++dst;
                }
            }
        }
    }

    return 0;
}

static int cin_decode_rle(const unsigned char *src, int src_size,
                           unsigned char *dst, int dst_size)
{
    int len, code;
    unsigned char *dst_end       = dst + dst_size;
    const unsigned char *src_end = src + src_size;

    while (src + 1 < src_end && dst < dst_end) {
        code = *src++;
        if (code & 0x80) {
            len = code - 0x7F;
            memset(dst, *src++, FFMIN(len, dst_end - dst));
        } else {
            len = code + 1;
            if (len > src_end-src) {
                av_log(NULL, AV_LOG_ERROR, "RLE overread\n");
                return AVERROR_INVALIDDATA;
            }
            memcpy(dst, src, FFMIN3(len, dst_end - dst, src_end - src));
            src += len;
        }
        dst += len;
    }
    return 0;
}

static int cinvideo_decode_frame(AVCodecContext *avctx,
                                 void *data, int *got_frame,
                                 AVPacket *avpkt)
{
    const uint8_t *buf   = avpkt->data;
    int buf_size         = avpkt->size;
    CinVideoContext *cin = avctx->priv_data;
    int i, y, palette_type, palette_colors_count,
        bitmap_frame_type, bitmap_frame_size, res = 0;

    palette_type         = buf[0];
    palette_colors_count = AV_RL16(buf + 1);
    bitmap_frame_type    = buf[3];
    buf                 += 4;

    bitmap_frame_size = buf_size - 4;

    /* handle palette */
    if (bitmap_frame_size < palette_colors_count * (3 + (palette_type != 0)))
        return AVERROR_INVALIDDATA;
    if (palette_type == 0) {
        if (palette_colors_count > 256)
            return AVERROR_INVALIDDATA;
        for (i = 0; i < palette_colors_count; ++i) {
            cin->palette[i]    = 0xFFU << 24 | bytestream_get_le24(&buf);
            bitmap_frame_size -= 3;
        }
    } else {
        for (i = 0; i < palette_colors_count; ++i) {
            cin->palette[buf[0]] = 0xFFU << 24 | AV_RL24(buf + 1);
            buf                 += 4;
            bitmap_frame_size   -= 4;
        }
    }

    /* note: the decoding routines below assumes that
     * surface.width = surface.pitch */
    switch (bitmap_frame_type) {
    case 9:
        cin_decode_rle(buf, bitmap_frame_size,
                       cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
        break;
    case 34:
        cin_decode_rle(buf, bitmap_frame_size,
                       cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
        cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP],
                             cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
        break;
    case 35:
        bitmap_frame_size = cin_decode_huffman(buf, bitmap_frame_size,
                           cin->bitmap_table[CIN_INT_BMP], cin->bitmap_size);
        cin_decode_rle(cin->bitmap_table[CIN_INT_BMP], bitmap_frame_size,
                       cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
        break;
    case 36:
        bitmap_frame_size = cin_decode_huffman(buf, bitmap_frame_size,
                                               cin->bitmap_table[CIN_INT_BMP],
                                               cin->bitmap_size);
        cin_decode_rle(cin->bitmap_table[CIN_INT_BMP], bitmap_frame_size,
                       cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
        cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP],
                             cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
        break;
    case 37:
        cin_decode_huffman(buf, bitmap_frame_size,
                           cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
        break;
    case 38:
        res = cin_decode_lzss(buf, bitmap_frame_size,
                              cin->bitmap_table[CIN_CUR_BMP],
                              cin->bitmap_size);
        if (res < 0)
            return res;
        break;
    case 39:
        res = cin_decode_lzss(buf, bitmap_frame_size,
                              cin->bitmap_table[CIN_CUR_BMP],
                              cin->bitmap_size);
        if (res < 0)
            return res;
        cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP],
                             cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
        break;
    }

    if ((res = ff_reget_buffer(avctx, cin->frame)) < 0)
        return res;

    memcpy(cin->frame->data[1], cin->palette, sizeof(cin->palette));
    cin->frame->palette_has_changed = 1;
    for (y = 0; y < cin->avctx->height; ++y)
        memcpy(cin->frame->data[0] + (cin->avctx->height - 1 - y) * cin->frame->linesize[0],
               cin->bitmap_table[CIN_CUR_BMP] + y * cin->avctx->width,
               cin->avctx->width);

    FFSWAP(uint8_t *, cin->bitmap_table[CIN_CUR_BMP],
                      cin->bitmap_table[CIN_PRE_BMP]);

    if ((res = av_frame_ref(data, cin->frame)) < 0)
        return res;

    *got_frame = 1;

    return buf_size;
}

static av_cold int cinvideo_decode_end(AVCodecContext *avctx)
{
    CinVideoContext *cin = avctx->priv_data;

    av_frame_free(&cin->frame);

    destroy_buffers(cin);

    return 0;
}

AVCodec ff_dsicinvideo_decoder = {
    .name           = "dsicinvideo",
    .long_name      = NULL_IF_CONFIG_SMALL("Delphine Software International CIN video"),
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_DSICINVIDEO,
    .priv_data_size = sizeof(CinVideoContext),
    .init           = cinvideo_decode_init,
    .close          = cinvideo_decode_end,
    .decode         = cinvideo_decode_frame,
    .capabilities   = CODEC_CAP_DR1,
};
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* Delphine Software International CIN video decoder
	3	* Copyright (c) 2006 Gregory Montoir (cyx@users.sourceforge.net)
	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 Street, Fifth Floor, Boston, MA 02110-1301 USA
	20	*/
	21
	22	/**
	23	* @file
	24	* Delphine Software International CIN video decoder
	25	*/
	26
	27	#include "avcodec.h"
	28	#include "bytestream.h"
	29	#include "internal.h"
	30
	31	typedef enum CinVideoBitmapIndex {
	32	CIN_CUR_BMP = 0, /* current */
	33	CIN_PRE_BMP = 1, /* previous */
	34	CIN_INT_BMP = 2 /* intermediate */
	35	} CinVideoBitmapIndex;
	36
	37	typedef struct CinVideoContext {
	38	AVCodecContext *avctx;
	39	AVFrame *frame;
	40	unsigned int bitmap_size;
	41	uint32_t palette[256];
	42	uint8_t *bitmap_table[3];
	43	} CinVideoContext;
	44
	45	static av_cold void destroy_buffers(CinVideoContext *cin)
	46	{
	47	int i;
	48
	49	for (i = 0; i < 3; ++i)
	50	av_freep(&cin->bitmap_table[i]);
	51	}
	52
	53	static av_cold int allocate_buffers(CinVideoContext *cin)
	54	{
	55	int i;
	56
	57	for (i = 0; i < 3; ++i) {
	58	cin->bitmap_table[i] = av_mallocz(cin->bitmap_size);
	59	if (!cin->bitmap_table[i]) {
	60	av_log(cin->avctx, AV_LOG_ERROR, "Can't allocate bitmap buffers.\n");
	61	destroy_buffers(cin);
	62	return AVERROR(ENOMEM);
	63	}
	64	}
65
66	return 0;
67	}
68
69	static av_cold int cinvideo_decode_init(AVCodecContext *avctx)
70	{
71	CinVideoContext *cin = avctx->priv_data;
72
73	cin->avctx = avctx;
74	avctx->pix_fmt = AV_PIX_FMT_PAL8;
75
76	cin->frame = av_frame_alloc();
77	if (!cin->frame)
78	return AVERROR(ENOMEM);
79
80	cin->bitmap_size = avctx->width * avctx->height;
81	if (allocate_buffers(cin))
82	return AVERROR(ENOMEM);
83
84	return 0;
85	}
86
87	static void cin_apply_delta_data(const unsigned char src, unsigned char dst,
88	int size)
89	{
90	while (size--)
91	dst++ += src++;
92	}
93
94	static int cin_decode_huffman(const unsigned char *src, int src_size,
95	unsigned char *dst, int dst_size)
96	{
97	int b, huff_code = 0;
98	unsigned char huff_code_table[15];
99	unsigned char *dst_cur = dst;
100	unsigned char *dst_end = dst + dst_size;
101	const unsigned char *src_end = src + src_size;
102
103	memcpy(huff_code_table, src, 15);
104	src += 15;
105
106	while (src < src_end) {
107	huff_code = *src++;
108	if ((huff_code >> 4) == 15) {
109	b = huff_code << 4;
110	huff_code = *src++;
111	*dst_cur++ = b \| (huff_code >> 4);
112	} else
113	*dst_cur++ = huff_code_table[huff_code >> 4];
114	if (dst_cur >= dst_end)
115	break;
116
117	huff_code &= 15;
118	if (huff_code == 15) {
119	dst_cur++ = src++;
120	} else
121	*dst_cur++ = huff_code_table[huff_code];
122	if (dst_cur >= dst_end)
123	break;
124	}
125
126	return dst_cur - dst;
127	}
128
129	static int cin_decode_lzss(const unsigned char *src, int src_size,
130	unsigned char *dst, int dst_size)
131	{
132	uint16_t cmd;
133	int i, sz, offset, code;
134	unsigned char dst_end = dst + dst_size, dst_start = dst;
135	const unsigned char *src_end = src + src_size;
136
137	while (src < src_end && dst < dst_end) {
138	code = *src++;
139	for (i = 0; i < 8 && src < src_end && dst < dst_end; ++i) {
140	if (code & (1 << i)) {
141	dst++ = src++;
142	} else {
143	cmd = AV_RL16(src);
144	src += 2;
145	offset = cmd >> 4;
146	if ((int)(dst - dst_start) < offset + 1)
147	return AVERROR_INVALIDDATA;
148	sz = (cmd & 0xF) + 2;
149	/* don't use memcpy/memmove here as the decoding routine
150	* (ab)uses buffer overlappings to repeat bytes in the
151	* destination */
152	sz = FFMIN(sz, dst_end - dst);
153	while (sz--) {
154	dst = (dst - offset - 1);
155	++dst;
156	}
157	}
158	}
159	}
160
161	return 0;
162	}
163
164	static int cin_decode_rle(const unsigned char *src, int src_size,
165	unsigned char *dst, int dst_size)
166	{
167	int len, code;
168	unsigned char *dst_end = dst + dst_size;
169	const unsigned char *src_end = src + src_size;
170
171	while (src + 1 < src_end && dst < dst_end) {
172	code = *src++;
173	if (code & 0x80) {
174	len = code - 0x7F;
175	memset(dst, *src++, FFMIN(len, dst_end - dst));
176	} else {
177	len = code + 1;
178	if (len > src_end-src) {
179	av_log(NULL, AV_LOG_ERROR, "RLE overread\n");
180	return AVERROR_INVALIDDATA;
181	}
182	memcpy(dst, src, FFMIN3(len, dst_end - dst, src_end - src));
183	src += len;
184	}
185	dst += len;
186	}
187	return 0;
188	}
189
190	static int cinvideo_decode_frame(AVCodecContext *avctx,
191	void data, int got_frame,
192	AVPacket *avpkt)
193	{
194	const uint8_t *buf = avpkt->data;
195	int buf_size = avpkt->size;
196	CinVideoContext *cin = avctx->priv_data;
197	int i, y, palette_type, palette_colors_count,
198	bitmap_frame_type, bitmap_frame_size, res = 0;
199
200	palette_type = buf[0];
201	palette_colors_count = AV_RL16(buf + 1);
202	bitmap_frame_type = buf[3];
203	buf += 4;
204
205	bitmap_frame_size = buf_size - 4;
206
207	/* handle palette */
208	if (bitmap_frame_size < palette_colors_count * (3 + (palette_type != 0)))
209	return AVERROR_INVALIDDATA;
210	if (palette_type == 0) {
211	if (palette_colors_count > 256)
212	return AVERROR_INVALIDDATA;
213	for (i = 0; i < palette_colors_count; ++i) {
214	cin->palette[i] = 0xFFU << 24 \| bytestream_get_le24(&buf);
215	bitmap_frame_size -= 3;
216	}
217	} else {
218	for (i = 0; i < palette_colors_count; ++i) {
219	cin->palette[buf[0]] = 0xFFU << 24 \| AV_RL24(buf + 1);
220	buf += 4;
221	bitmap_frame_size -= 4;
222	}
223	}
224
225	/* note: the decoding routines below assumes that
226	* surface.width = surface.pitch */
227	switch (bitmap_frame_type) {
228	case 9:
229	cin_decode_rle(buf, bitmap_frame_size,
230	cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
231	break;
232	case 34:
233	cin_decode_rle(buf, bitmap_frame_size,
234	cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
235	cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP],
236	cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
237	break;
238	case 35:
239	bitmap_frame_size = cin_decode_huffman(buf, bitmap_frame_size,
240	cin->bitmap_table[CIN_INT_BMP], cin->bitmap_size);
241	cin_decode_rle(cin->bitmap_table[CIN_INT_BMP], bitmap_frame_size,
242	cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
243	break;
244	case 36:
245	bitmap_frame_size = cin_decode_huffman(buf, bitmap_frame_size,
246	cin->bitmap_table[CIN_INT_BMP],
247	cin->bitmap_size);
248	cin_decode_rle(cin->bitmap_table[CIN_INT_BMP], bitmap_frame_size,
249	cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
250	cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP],
251	cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
252	break;
253	case 37:
254	cin_decode_huffman(buf, bitmap_frame_size,
255	cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
256	break;
257	case 38:
258	res = cin_decode_lzss(buf, bitmap_frame_size,
259	cin->bitmap_table[CIN_CUR_BMP],
260	cin->bitmap_size);
261	if (res < 0)
262	return res;
263	break;
264	case 39:
265	res = cin_decode_lzss(buf, bitmap_frame_size,
266	cin->bitmap_table[CIN_CUR_BMP],
267	cin->bitmap_size);
268	if (res < 0)
269	return res;
270	cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP],
271	cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
272	break;
273	}
274
275	if ((res = ff_reget_buffer(avctx, cin->frame)) < 0)
276	return res;
277
278	memcpy(cin->frame->data[1], cin->palette, sizeof(cin->palette));
279	cin->frame->palette_has_changed = 1;
280	for (y = 0; y < cin->avctx->height; ++y)
281	memcpy(cin->frame->data[0] + (cin->avctx->height - 1 - y) * cin->frame->linesize[0],
282	cin->bitmap_table[CIN_CUR_BMP] + y * cin->avctx->width,
283	cin->avctx->width);
284
285	FFSWAP(uint8_t *, cin->bitmap_table[CIN_CUR_BMP],
286	cin->bitmap_table[CIN_PRE_BMP]);
287
288	if ((res = av_frame_ref(data, cin->frame)) < 0)
289	return res;
290
291	*got_frame = 1;
292
293	return buf_size;
294	}
295
296	static av_cold int cinvideo_decode_end(AVCodecContext *avctx)
297	{
298	CinVideoContext *cin = avctx->priv_data;
299
300	av_frame_free(&cin->frame);
301
302	destroy_buffers(cin);
303
304	return 0;
305	}
306
307	AVCodec ff_dsicinvideo_decoder = {
308	.name = "dsicinvideo",
309	.long_name = NULL_IF_CONFIG_SMALL("Delphine Software International CIN video"),
310	.type = AVMEDIA_TYPE_VIDEO,
311	.id = AV_CODEC_ID_DSICINVIDEO,
312	.priv_data_size = sizeof(CinVideoContext),
313	.init = cinvideo_decode_init,
314	.close = cinvideo_decode_end,
315	.decode = cinvideo_decode_frame,
316	.capabilities = CODEC_CAP_DR1,
317	};