[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;

    if (width & 1)
        return AVERROR_INVALIDDATA;

    /* first line contain absolute values, other lines contain deltas */
    while (out < width) {
        int 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) {
            int 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 */
                int 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;
2ba45a60 DM	57
	58	if (width & 1)
	59	return AVERROR_INVALIDDATA;
	60
	61	/* first line contain absolute values, other lines contain deltas */
	62	while (out < width) {
f6fa7814	63	int c = ir2_get_code(&ctx->gb);
2ba45a60 DM	64	if (c >= 0x80) { /* we have a run */
	65	c -= 0x7F;
	66	if (out + c*2 > width)
	67	return AVERROR_INVALIDDATA;
	68	for (i = 0; i < c * 2; i++)
	69	dst[out++] = 0x80;
	70	} else { /* copy two values from table */
	71	dst[out++] = table[c * 2];
	72	dst[out++] = table[(c * 2) + 1];
	73	}
	74	}
	75	dst += pitch;
	76
	77	for (j = 1; j < height; j++) {
	78	out = 0;
	79	while (out < width) {
f6fa7814	80	int c = ir2_get_code(&ctx->gb);
2ba45a60 DM	81	if (c >= 0x80) { /* we have a skip */
	82	c -= 0x7F;
	83	if (out + c*2 > width)
	84	return AVERROR_INVALIDDATA;
	85	for (i = 0; i < c * 2; i++) {
	86	dst[out] = dst[out - pitch];
	87	out++;
	88	}
	89	} else { /* add two deltas from table */
f6fa7814	90	int t = dst[out - pitch] + (table[c * 2] - 128);
2ba45a60 DM	91	t = av_clip_uint8(t);
	92	dst[out] = t;
	93	out++;
	94	t = dst[out - pitch] + (table[(c * 2) + 1] - 128);
	95	t = av_clip_uint8(t);
	96	dst[out] = t;
	97	out++;
	98	}
	99	}
	100	dst += pitch;
	101	}
	102	return 0;
	103	}
	104
	105	static int ir2_decode_plane_inter(Ir2Context ctx, int width, int height, uint8_t dst,
	106	int pitch, const uint8_t *table)
	107	{
	108	int j;
	109	int out = 0;
	110	int c;
	111	int t;
	112
	113	if (width & 1)
	114	return AVERROR_INVALIDDATA;
	115
	116	for (j = 0; j < height; j++) {
	117	out = 0;
	118	while (out < width) {
	119	c = ir2_get_code(&ctx->gb);
	120	if (c >= 0x80) { /* we have a skip */
	121	c -= 0x7F;
	122	out += c * 2;
	123	} else { /* add two deltas from table */
	124	t = dst[out] + (((table[c * 2] - 128)*3) >> 2);
	125	t = av_clip_uint8(t);
	126	dst[out] = t;
	127	out++;
	128	t = dst[out] + (((table[(c * 2) + 1] - 128)*3) >> 2);
	129	t = av_clip_uint8(t);
	130	dst[out] = t;
	131	out++;
	132	}
	133	}
	134	dst += pitch;
	135	}
	136	return 0;
	137	}
	138
	139	static int ir2_decode_frame(AVCodecContext *avctx,
	140	void data, int got_frame,
	141	AVPacket *avpkt)
	142	{
	143	Ir2Context * const s = avctx->priv_data;
	144	const uint8_t *buf = avpkt->data;
	145	int buf_size = avpkt->size;
	146	AVFrame *picture = data;
	147	AVFrame * const p = s->picture;
	148	int start, ret;
	149
	150	if ((ret = ff_reget_buffer(avctx, p)) < 0)
	151	return ret;
	152
	153	start = 48; /* hardcoded for now */
	154
155	if (start >= buf_size) {
156	av_log(s->avctx, AV_LOG_ERROR, "input buffer size too small (%d)\n", buf_size);
157	return AVERROR_INVALIDDATA;
158	}
159
160	s->decode_delta = buf[18];
161
162	/* decide whether frame uses deltas or not */
163	#ifndef BITSTREAM_READER_LE
164	for (i = 0; i < buf_size; i++)
165	buf[i] = ff_reverse[buf[i]];
166	#endif
167
168	init_get_bits(&s->gb, buf + start, (buf_size - start) * 8);
169
170	if (s->decode_delta) { /* intraframe */
171	if ((ret = ir2_decode_plane(s, avctx->width, avctx->height,
172	p->data[0], p->linesize[0],
173	ir2_luma_table)) < 0)
174	return ret;
175
176	/* swapped U and V */
177	if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
178	p->data[2], p->linesize[2],
179	ir2_luma_table)) < 0)
180	return ret;
181	if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
182	p->data[1], p->linesize[1],
183	ir2_luma_table)) < 0)
184	return ret;
185	} else { /* interframe */
186	if ((ret = ir2_decode_plane_inter(s, avctx->width, avctx->height,
187	p->data[0], p->linesize[0],
188	ir2_luma_table)) < 0)
189	return ret;
190	/* swapped U and V */
191	if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
192	p->data[2], p->linesize[2],
193	ir2_luma_table)) < 0)
194	return ret;
195	if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
196	p->data[1], p->linesize[1],
197	ir2_luma_table)) < 0)
198	return ret;
199	}
200
201	if ((ret = av_frame_ref(picture, p)) < 0)
202	return ret;
203
204	*got_frame = 1;
205
206	return buf_size;
207	}
208
209	static av_cold int ir2_decode_init(AVCodecContext *avctx)
210	{
211	Ir2Context * const ic = avctx->priv_data;
212	static VLC_TYPE vlc_tables[1 << CODE_VLC_BITS][2];
213
214	ic->avctx = avctx;
215
216	avctx->pix_fmt= AV_PIX_FMT_YUV410P;
217
218	ic->picture = av_frame_alloc();
219	if (!ic->picture)
220	return AVERROR(ENOMEM);
221
222	ir2_vlc.table = vlc_tables;
223	ir2_vlc.table_allocated = 1 << CODE_VLC_BITS;
224	#ifdef BITSTREAM_READER_LE
225	init_vlc(&ir2_vlc, CODE_VLC_BITS, IR2_CODES,
226	&ir2_codes[0][1], 4, 2,
227	&ir2_codes[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC \| INIT_VLC_LE);
228	#else
229	init_vlc(&ir2_vlc, CODE_VLC_BITS, IR2_CODES,
230	&ir2_codes[0][1], 4, 2,
231	&ir2_codes[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC);
232	#endif
233
234	return 0;
235	}
236
237	static av_cold int ir2_decode_end(AVCodecContext *avctx)
238	{
239	Ir2Context * const ic = avctx->priv_data;
240
241	av_frame_free(&ic->picture);
242
243	return 0;
244	}
245
246	AVCodec ff_indeo2_decoder = {
247	.name = "indeo2",
248	.long_name = NULL_IF_CONFIG_SMALL("Intel Indeo 2"),
249	.type = AVMEDIA_TYPE_VIDEO,
250	.id = AV_CODEC_ID_INDEO2,
251	.priv_data_size = sizeof(Ir2Context),
252	.init = ir2_decode_init,
253	.close = ir2_decode_end,
254	.decode = ir2_decode_frame,
255	.capabilities = CODEC_CAP_DR1,
256	};