[deb_ffmpeg.git] / ffmpeg / libavcodec / indeo2.c

/*
 * Intel Indeo 2 codec
 * Copyright (c) 2005 Konstantin Shishkov
 *
 * 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
 * Intel Indeo 2 decoder.
 */

#define BITSTREAM_READER_LE
#include "libavutil/attributes.h"
#include "avcodec.h"
#include "get_bits.h"
#include "indeo2data.h"
#include "internal.h"
#include "mathops.h"

typedef struct Ir2Context{
    AVCodecContext *avctx;
    AVFrame *picture;
    GetBitContext gb;
    int decode_delta;
} Ir2Context;

#define CODE_VLC_BITS 14
static VLC ir2_vlc;

/* Indeo 2 codes are in range 0x01..0x7F and 0x81..0x90 */
static inline int ir2_get_code(GetBitContext *gb)
{
    return get_vlc2(gb, ir2_vlc.table, CODE_VLC_BITS, 1) + 1;
}

static int ir2_decode_plane(Ir2Context *ctx, int width, int height, uint8_t *dst,
                            int pitch, const uint8_t *table)
{
    int i;
    int j;
    int out = 0;
    int c;
    int t;

    if (width & 1)
        return AVERROR_INVALIDDATA;

    /* first line contain absolute values, other lines contain deltas */
    while (out < width) {
        c = ir2_get_code(&ctx->gb);
        if (c >= 0x80) { /* we have a run */
            c -= 0x7F;
            if (out + c*2 > width)
                return AVERROR_INVALIDDATA;
            for (i = 0; i < c * 2; i++)
                dst[out++] = 0x80;
        } else { /* copy two values from table */
            dst[out++] = table[c * 2];
            dst[out++] = table[(c * 2) + 1];
        }
    }
    dst += pitch;

    for (j = 1; j < height; j++) {
        out = 0;
        while (out < width) {
            c = ir2_get_code(&ctx->gb);
            if (c >= 0x80) { /* we have a skip */
                c -= 0x7F;
                if (out + c*2 > width)
                    return AVERROR_INVALIDDATA;
                for (i = 0; i < c * 2; i++) {
                    dst[out] = dst[out - pitch];
                    out++;
                }
            } else { /* add two deltas from table */
                t        = dst[out - pitch] + (table[c * 2] - 128);
                t        = av_clip_uint8(t);
                dst[out] = t;
                out++;
                t        = dst[out - pitch] + (table[(c * 2) + 1] - 128);
                t        = av_clip_uint8(t);
                dst[out] = t;
                out++;
            }
        }
        dst += pitch;
    }
    return 0;
}

static int ir2_decode_plane_inter(Ir2Context *ctx, int width, int height, uint8_t *dst,
                                  int pitch, const uint8_t *table)
{
    int j;
    int out = 0;
    int c;
    int t;

    if (width & 1)
        return AVERROR_INVALIDDATA;

    for (j = 0; j < height; j++) {
        out = 0;
        while (out < width) {
            c = ir2_get_code(&ctx->gb);
            if (c >= 0x80) { /* we have a skip */
                c   -= 0x7F;
                out += c * 2;
            } else { /* add two deltas from table */
                t        = dst[out] + (((table[c * 2] - 128)*3) >> 2);
                t        = av_clip_uint8(t);
                dst[out] = t;
                out++;
                t        = dst[out] + (((table[(c * 2) + 1] - 128)*3) >> 2);
                t        = av_clip_uint8(t);
                dst[out] = t;
                out++;
            }
        }
        dst += pitch;
    }
    return 0;
}

static int ir2_decode_frame(AVCodecContext *avctx,
                        void *data, int *got_frame,
                        AVPacket *avpkt)
{
    Ir2Context * const s = avctx->priv_data;
    const uint8_t *buf   = avpkt->data;
    int buf_size         = avpkt->size;
    AVFrame *picture     = data;
    AVFrame * const p    = s->picture;
    int start, ret;

    if ((ret = ff_reget_buffer(avctx, p)) < 0)
        return ret;

    start = 48; /* hardcoded for now */

    if (start >= buf_size) {
        av_log(s->avctx, AV_LOG_ERROR, "input buffer size too small (%d)\n", buf_size);
        return AVERROR_INVALIDDATA;
    }

    s->decode_delta = buf[18];

    /* decide whether frame uses deltas or not */
#ifndef BITSTREAM_READER_LE
    for (i = 0; i < buf_size; i++)
        buf[i] = ff_reverse[buf[i]];
#endif

    init_get_bits(&s->gb, buf + start, (buf_size - start) * 8);

    if (s->decode_delta) { /* intraframe */
        if ((ret = ir2_decode_plane(s, avctx->width, avctx->height,
                                    p->data[0], p->linesize[0],
                                    ir2_luma_table)) < 0)
            return ret;

        /* swapped U and V */
        if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
                                    p->data[2], p->linesize[2],
                                    ir2_luma_table)) < 0)
            return ret;
        if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
                                    p->data[1], p->linesize[1],
                                    ir2_luma_table)) < 0)
            return ret;
    } else { /* interframe */
        if ((ret = ir2_decode_plane_inter(s, avctx->width, avctx->height,
                                          p->data[0], p->linesize[0],
                                          ir2_luma_table)) < 0)
            return ret;
        /* swapped U and V */
        if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
                                          p->data[2], p->linesize[2],
                                          ir2_luma_table)) < 0)
            return ret;
        if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
                                          p->data[1], p->linesize[1],
                                          ir2_luma_table)) < 0)
            return ret;
    }

    if ((ret = av_frame_ref(picture, p)) < 0)
        return ret;

    *got_frame = 1;

    return buf_size;
}

static av_cold int ir2_decode_init(AVCodecContext *avctx)
{
    Ir2Context * const ic = avctx->priv_data;
    static VLC_TYPE vlc_tables[1 << CODE_VLC_BITS][2];

    ic->avctx = avctx;

    avctx->pix_fmt= AV_PIX_FMT_YUV410P;

    ic->picture = av_frame_alloc();
    if (!ic->picture)
        return AVERROR(ENOMEM);

    ir2_vlc.table = vlc_tables;
    ir2_vlc.table_allocated = 1 << CODE_VLC_BITS;
#ifdef BITSTREAM_READER_LE
        init_vlc(&ir2_vlc, CODE_VLC_BITS, IR2_CODES,
                 &ir2_codes[0][1], 4, 2,
                 &ir2_codes[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC | INIT_VLC_LE);
#else
        init_vlc(&ir2_vlc, CODE_VLC_BITS, IR2_CODES,
                 &ir2_codes[0][1], 4, 2,
                 &ir2_codes[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC);
#endif

    return 0;
}

static av_cold int ir2_decode_end(AVCodecContext *avctx)
{
    Ir2Context * const ic = avctx->priv_data;

    av_frame_free(&ic->picture);

    return 0;
}

AVCodec ff_indeo2_decoder = {
    .name           = "indeo2",
    .long_name      = NULL_IF_CONFIG_SMALL("Intel Indeo 2"),
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_INDEO2,
    .priv_data_size = sizeof(Ir2Context),
    .init           = ir2_decode_init,
    .close          = ir2_decode_end,
    .decode         = ir2_decode_frame,
    .capabilities   = CODEC_CAP_DR1,
};
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* Intel Indeo 2 codec
	3	* Copyright (c) 2005 Konstantin Shishkov
	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	* Intel Indeo 2 decoder.
	25	*/
	26
	27	#define BITSTREAM_READER_LE
	28	#include "libavutil/attributes.h"
	29	#include "avcodec.h"
	30	#include "get_bits.h"
	31	#include "indeo2data.h"
	32	#include "internal.h"
	33	#include "mathops.h"
	34
	35	typedef struct Ir2Context{
	36	AVCodecContext *avctx;
	37	AVFrame *picture;
	38	GetBitContext gb;
	39	int decode_delta;
	40	} Ir2Context;
	41
	42	#define CODE_VLC_BITS 14
	43	static VLC ir2_vlc;
	44
	45	/* Indeo 2 codes are in range 0x01..0x7F and 0x81..0x90 */
	46	static inline int ir2_get_code(GetBitContext *gb)
	47	{
	48	return get_vlc2(gb, ir2_vlc.table, CODE_VLC_BITS, 1) + 1;
	49	}
	50
	51	static int ir2_decode_plane(Ir2Context ctx, int width, int height, uint8_t dst,
	52	int pitch, const uint8_t *table)
	53	{
	54	int i;
	55	int j;
	56	int out = 0;
	57	int c;
	58	int t;
	59
	60	if (width & 1)
	61	return AVERROR_INVALIDDATA;
	62
	63	/* first line contain absolute values, other lines contain deltas */
	64	while (out < width) {
65	c = ir2_get_code(&ctx->gb);
66	if (c >= 0x80) { /* we have a run */
67	c -= 0x7F;
68	if (out + c*2 > width)
69	return AVERROR_INVALIDDATA;
70	for (i = 0; i < c * 2; i++)
71	dst[out++] = 0x80;
72	} else { /* copy two values from table */
73	dst[out++] = table[c * 2];
74	dst[out++] = table[(c * 2) + 1];
75	}
76	}
77	dst += pitch;
78
79	for (j = 1; j < height; j++) {
80	out = 0;
81	while (out < width) {
82	c = ir2_get_code(&ctx->gb);
83	if (c >= 0x80) { /* we have a skip */
84	c -= 0x7F;
85	if (out + c*2 > width)
86	return AVERROR_INVALIDDATA;
87	for (i = 0; i < c * 2; i++) {
88	dst[out] = dst[out - pitch];
89	out++;
90	}
91	} else { /* add two deltas from table */
92	t = dst[out - pitch] + (table[c * 2] - 128);
93	t = av_clip_uint8(t);
94	dst[out] = t;
95	out++;
96	t = dst[out - pitch] + (table[(c * 2) + 1] - 128);
97	t = av_clip_uint8(t);
98	dst[out] = t;
99	out++;
100	}
101	}
102	dst += pitch;
103	}
104	return 0;
105	}
106
107	static int ir2_decode_plane_inter(Ir2Context ctx, int width, int height, uint8_t dst,
108	int pitch, const uint8_t *table)
109	{
110	int j;
111	int out = 0;
112	int c;
113	int t;
114
115	if (width & 1)
116	return AVERROR_INVALIDDATA;
117
118	for (j = 0; j < height; j++) {
119	out = 0;
120	while (out < width) {
121	c = ir2_get_code(&ctx->gb);
122	if (c >= 0x80) { /* we have a skip */
123	c -= 0x7F;
124	out += c * 2;
125	} else { /* add two deltas from table */
126	t = dst[out] + (((table[c * 2] - 128)*3) >> 2);
127	t = av_clip_uint8(t);
128	dst[out] = t;
129	out++;
130	t = dst[out] + (((table[(c * 2) + 1] - 128)*3) >> 2);
131	t = av_clip_uint8(t);
132	dst[out] = t;
133	out++;
134	}
135	}
136	dst += pitch;
137	}
138	return 0;
139	}
140
141	static int ir2_decode_frame(AVCodecContext *avctx,
142	void data, int got_frame,
143	AVPacket *avpkt)
144	{
145	Ir2Context * const s = avctx->priv_data;
146	const uint8_t *buf = avpkt->data;
147	int buf_size = avpkt->size;
148	AVFrame *picture = data;
149	AVFrame * const p = s->picture;
150	int start, ret;
151
152	if ((ret = ff_reget_buffer(avctx, p)) < 0)
153	return ret;
154
155	start = 48; /* hardcoded for now */
156
157	if (start >= buf_size) {
158	av_log(s->avctx, AV_LOG_ERROR, "input buffer size too small (%d)\n", buf_size);
159	return AVERROR_INVALIDDATA;
160	}
161
162	s->decode_delta = buf[18];
163
164	/* decide whether frame uses deltas or not */
165	#ifndef BITSTREAM_READER_LE
166	for (i = 0; i < buf_size; i++)
167	buf[i] = ff_reverse[buf[i]];
168	#endif
169
170	init_get_bits(&s->gb, buf + start, (buf_size - start) * 8);
171
172	if (s->decode_delta) { /* intraframe */
173	if ((ret = ir2_decode_plane(s, avctx->width, avctx->height,
174	p->data[0], p->linesize[0],
175	ir2_luma_table)) < 0)
176	return ret;
177
178	/* swapped U and V */
179	if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
180	p->data[2], p->linesize[2],
181	ir2_luma_table)) < 0)
182	return ret;
183	if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
184	p->data[1], p->linesize[1],
185	ir2_luma_table)) < 0)
186	return ret;
187	} else { /* interframe */
188	if ((ret = ir2_decode_plane_inter(s, avctx->width, avctx->height,
189	p->data[0], p->linesize[0],
190	ir2_luma_table)) < 0)
191	return ret;
192	/* swapped U and V */
193	if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
194	p->data[2], p->linesize[2],
195	ir2_luma_table)) < 0)
196	return ret;
197	if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
198	p->data[1], p->linesize[1],
199	ir2_luma_table)) < 0)
200	return ret;
201	}
202
203	if ((ret = av_frame_ref(picture, p)) < 0)
204	return ret;
205
206	*got_frame = 1;
207
208	return buf_size;
209	}
210
211	static av_cold int ir2_decode_init(AVCodecContext *avctx)
212	{
213	Ir2Context * const ic = avctx->priv_data;
214	static VLC_TYPE vlc_tables[1 << CODE_VLC_BITS][2];
215
216	ic->avctx = avctx;
217
218	avctx->pix_fmt= AV_PIX_FMT_YUV410P;
219
220	ic->picture = av_frame_alloc();
221	if (!ic->picture)
222	return AVERROR(ENOMEM);
223
224	ir2_vlc.table = vlc_tables;
225	ir2_vlc.table_allocated = 1 << CODE_VLC_BITS;
226	#ifdef BITSTREAM_READER_LE
227	init_vlc(&ir2_vlc, CODE_VLC_BITS, IR2_CODES,
228	&ir2_codes[0][1], 4, 2,
229	&ir2_codes[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC \| INIT_VLC_LE);
230	#else
231	init_vlc(&ir2_vlc, CODE_VLC_BITS, IR2_CODES,
232	&ir2_codes[0][1], 4, 2,
233	&ir2_codes[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC);
234	#endif
235
236	return 0;
237	}
238
239	static av_cold int ir2_decode_end(AVCodecContext *avctx)
240	{
241	Ir2Context * const ic = avctx->priv_data;
242
243	av_frame_free(&ic->picture);
244
245	return 0;
246	}
247
248	AVCodec ff_indeo2_decoder = {
249	.name = "indeo2",
250	.long_name = NULL_IF_CONFIG_SMALL("Intel Indeo 2"),
251	.type = AVMEDIA_TYPE_VIDEO,
252	.id = AV_CODEC_ID_INDEO2,
253	.priv_data_size = sizeof(Ir2Context),
254	.init = ir2_decode_init,
255	.close = ir2_decode_end,
256	.decode = ir2_decode_frame,
257	.capabilities = CODEC_CAP_DR1,
258	};