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

/*
 * Bitmap Brothers JV video decoder
 * Copyright (c) 2011 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 Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * Bitmap Brothers JV video decoder
 * @author Peter Ross <pross@xvid.org>
 */

#include "libavutil/intreadwrite.h"

#include "avcodec.h"
#include "blockdsp.h"
#include "get_bits.h"
#include "internal.h"

typedef struct JvContext {
    BlockDSPContext bdsp;
    AVFrame   *frame;
    uint32_t   palette[AVPALETTE_COUNT];
    int        palette_has_changed;
} JvContext;

static av_cold int decode_init(AVCodecContext *avctx)
{
    JvContext *s = avctx->priv_data;

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

    avctx->pix_fmt = AV_PIX_FMT_PAL8;
    ff_blockdsp_init(&s->bdsp, avctx);
    return 0;
}

/**
 * Decode 2x2 block
 */
static inline void decode2x2(GetBitContext *gb, uint8_t *dst, int linesize)
{
    int i, j, v[2];

    switch (get_bits(gb, 2)) {
    case 1:
        v[0] = get_bits(gb, 8);
        for (j = 0; j < 2; j++)
            memset(dst + j * linesize, v[0], 2);
        break;
    case 2:
        v[0] = get_bits(gb, 8);
        v[1] = get_bits(gb, 8);
        for (j = 0; j < 2; j++)
            for (i = 0; i < 2; i++)
                dst[j * linesize + i] = v[get_bits1(gb)];
        break;
    case 3:
        for (j = 0; j < 2; j++)
            for (i = 0; i < 2; i++)
                dst[j * linesize + i] = get_bits(gb, 8);
    }
}

/**
 * Decode 4x4 block
 */
static inline void decode4x4(GetBitContext *gb, uint8_t *dst, int linesize)
{
    int i, j, v[2];

    switch (get_bits(gb, 2)) {
    case 1:
        v[0] = get_bits(gb, 8);
        for (j = 0; j < 4; j++)
            memset(dst + j * linesize, v[0], 4);
        break;
    case 2:
        v[0] = get_bits(gb, 8);
        v[1] = get_bits(gb, 8);
        for (j = 2; j >= 0; j -= 2) {
            for (i = 0; i < 4; i++)
                dst[j * linesize + i] = v[get_bits1(gb)];
            for (i = 0; i < 4; i++)
                dst[(j + 1) * linesize + i] = v[get_bits1(gb)];
        }
        break;
    case 3:
        for (j = 0; j < 4; j += 2)
            for (i = 0; i < 4; i += 2)
                decode2x2(gb, dst + j * linesize + i, linesize);
    }
}

/**
 * Decode 8x8 block
 */
static inline void decode8x8(GetBitContext *gb, uint8_t *dst, int linesize,
                             BlockDSPContext *bdsp)
{
    int i, j, v[2];

    switch (get_bits(gb, 2)) {
    case 1:
        v[0] = get_bits(gb, 8);
        bdsp->fill_block_tab[1](dst, v[0], linesize, 8);
        break;
    case 2:
        v[0] = get_bits(gb, 8);
        v[1] = get_bits(gb, 8);
        for (j = 7; j >= 0; j--)
            for (i = 0; i < 8; i++)
                dst[j * linesize + i] = v[get_bits1(gb)];
        break;
    case 3:
        for (j = 0; j < 8; j += 4)
            for (i = 0; i < 8; i += 4)
                decode4x4(gb, dst + j * linesize + i, linesize);
    }
}

static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
                        AVPacket *avpkt)
{
    JvContext *s = avctx->priv_data;
    const uint8_t *buf = avpkt->data;
    const uint8_t *buf_end = buf + avpkt->size;
    int video_size, video_type, i, j, ret;

    if (avpkt->size < 6)
        return AVERROR_INVALIDDATA;

    video_size = AV_RL32(buf);
    video_type = buf[4];
    buf += 5;

    if (video_size) {
        if (video_size < 0 || video_size > avpkt->size - 5) {
            av_log(avctx, AV_LOG_ERROR, "video size %d invalid\n", video_size);
            return AVERROR_INVALIDDATA;
        }
        if ((ret = ff_reget_buffer(avctx, s->frame)) < 0)
            return ret;

        if (video_type == 0 || video_type == 1) {
            GetBitContext gb;
            init_get_bits(&gb, buf, 8 * video_size);

            for (j = 0; j < avctx->height; j += 8)
                for (i = 0; i < avctx->width; i += 8)
                    decode8x8(&gb,
                              s->frame->data[0] + j * s->frame->linesize[0] + i,
                              s->frame->linesize[0], &s->bdsp);

            buf += video_size;
        } else if (video_type == 2) {
            int v = *buf++;
            for (j = 0; j < avctx->height; j++)
                memset(s->frame->data[0] + j * s->frame->linesize[0],
                       v, avctx->width);
        } else {
            av_log(avctx, AV_LOG_WARNING,
                   "unsupported frame type %i\n", video_type);
            return AVERROR_INVALIDDATA;
        }
    }

    if (buf_end - buf >= AVPALETTE_COUNT * 3) {
        for (i = 0; i < AVPALETTE_COUNT; i++) {
            uint32_t pal = AV_RB24(buf);
            s->palette[i] = 0xFFU << 24 | pal << 2 | ((pal >> 4) & 0x30303);
            buf += 3;
        }
        s->palette_has_changed = 1;
    }

    if (video_size) {
        s->frame->key_frame           = 1;
        s->frame->pict_type           = AV_PICTURE_TYPE_I;
        s->frame->palette_has_changed = s->palette_has_changed;
        s->palette_has_changed        = 0;
        memcpy(s->frame->data[1], s->palette, AVPALETTE_SIZE);

        if ((ret = av_frame_ref(data, s->frame)) < 0)
            return ret;
        *got_frame = 1;
    }

    return avpkt->size;
}

static av_cold int decode_close(AVCodecContext *avctx)
{
    JvContext *s = avctx->priv_data;

    av_frame_free(&s->frame);

    return 0;
}

AVCodec ff_jv_decoder = {
    .name           = "jv",
    .long_name      = NULL_IF_CONFIG_SMALL("Bitmap Brothers JV video"),
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_JV,
    .priv_data_size = sizeof(JvContext),
    .init           = decode_init,
    .close          = decode_close,
    .decode         = decode_frame,
    .capabilities   = CODEC_CAP_DR1,
};
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* Bitmap Brothers JV video decoder
	3	* Copyright (c) 2011 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 Street, Fifth Floor, Boston, MA 02110-1301 USA
	20	*/
	21
	22	/**
	23	* @file
	24	* Bitmap Brothers JV video decoder
	25	* @author Peter Ross <pross@xvid.org>
	26	*/
	27
	28	#include "libavutil/intreadwrite.h"
	29
	30	#include "avcodec.h"
	31	#include "blockdsp.h"
	32	#include "get_bits.h"
	33	#include "internal.h"
	34
	35	typedef struct JvContext {
	36	BlockDSPContext bdsp;
	37	AVFrame *frame;
	38	uint32_t palette[AVPALETTE_COUNT];
	39	int palette_has_changed;
	40	} JvContext;
	41
	42	static av_cold int decode_init(AVCodecContext *avctx)
	43	{
	44	JvContext *s = avctx->priv_data;
	45
	46	s->frame = av_frame_alloc();
	47	if (!s->frame)
	48	return AVERROR(ENOMEM);
	49
	50	avctx->pix_fmt = AV_PIX_FMT_PAL8;
	51	ff_blockdsp_init(&s->bdsp, avctx);
	52	return 0;
	53	}
	54
	55	/**
	56	* Decode 2x2 block
	57	*/
	58	static inline void decode2x2(GetBitContext gb, uint8_t dst, int linesize)
	59	{
	60	int i, j, v[2];
	61
	62	switch (get_bits(gb, 2)) {
	63	case 1:
	64	v[0] = get_bits(gb, 8);
65	for (j = 0; j < 2; j++)
66	memset(dst + j * linesize, v[0], 2);
67	break;
68	case 2:
69	v[0] = get_bits(gb, 8);
70	v[1] = get_bits(gb, 8);
71	for (j = 0; j < 2; j++)
72	for (i = 0; i < 2; i++)
73	dst[j * linesize + i] = v[get_bits1(gb)];
74	break;
75	case 3:
76	for (j = 0; j < 2; j++)
77	for (i = 0; i < 2; i++)
78	dst[j * linesize + i] = get_bits(gb, 8);
79	}
80	}
81
82	/**
83	* Decode 4x4 block
84	*/
85	static inline void decode4x4(GetBitContext gb, uint8_t dst, int linesize)
86	{
87	int i, j, v[2];
88
89	switch (get_bits(gb, 2)) {
90	case 1:
91	v[0] = get_bits(gb, 8);
92	for (j = 0; j < 4; j++)
93	memset(dst + j * linesize, v[0], 4);
94	break;
95	case 2:
96	v[0] = get_bits(gb, 8);
97	v[1] = get_bits(gb, 8);
98	for (j = 2; j >= 0; j -= 2) {
99	for (i = 0; i < 4; i++)
100	dst[j * linesize + i] = v[get_bits1(gb)];
101	for (i = 0; i < 4; i++)
102	dst[(j + 1) * linesize + i] = v[get_bits1(gb)];
103	}
104	break;
105	case 3:
106	for (j = 0; j < 4; j += 2)
107	for (i = 0; i < 4; i += 2)
108	decode2x2(gb, dst + j * linesize + i, linesize);
109	}
110	}
111
112	/**
113	* Decode 8x8 block
114	*/
115	static inline void decode8x8(GetBitContext gb, uint8_t dst, int linesize,
116	BlockDSPContext *bdsp)
117	{
118	int i, j, v[2];
119
120	switch (get_bits(gb, 2)) {
121	case 1:
122	v[0] = get_bits(gb, 8);
123	bdsp->fill_block_tab[1](dst, v[0], linesize, 8);
124	break;
125	case 2:
126	v[0] = get_bits(gb, 8);
127	v[1] = get_bits(gb, 8);
128	for (j = 7; j >= 0; j--)
129	for (i = 0; i < 8; i++)
130	dst[j * linesize + i] = v[get_bits1(gb)];
131	break;
132	case 3:
133	for (j = 0; j < 8; j += 4)
134	for (i = 0; i < 8; i += 4)
135	decode4x4(gb, dst + j * linesize + i, linesize);
136	}
137	}
138
139	static int decode_frame(AVCodecContext avctx, void data, int *got_frame,
140	AVPacket *avpkt)
141	{
142	JvContext *s = avctx->priv_data;
143	const uint8_t *buf = avpkt->data;
144	const uint8_t *buf_end = buf + avpkt->size;
145	int video_size, video_type, i, j, ret;
146
147	if (avpkt->size < 6)
148	return AVERROR_INVALIDDATA;
149
150	video_size = AV_RL32(buf);
151	video_type = buf[4];
152	buf += 5;
153
154	if (video_size) {
155	if (video_size < 0 \|\| video_size > avpkt->size - 5) {
156	av_log(avctx, AV_LOG_ERROR, "video size %d invalid\n", video_size);
157	return AVERROR_INVALIDDATA;
158	}
159	if ((ret = ff_reget_buffer(avctx, s->frame)) < 0)
160	return ret;
161
162	if (video_type == 0 \|\| video_type == 1) {
163	GetBitContext gb;
164	init_get_bits(&gb, buf, 8 * video_size);
165
166	for (j = 0; j < avctx->height; j += 8)
167	for (i = 0; i < avctx->width; i += 8)
168	decode8x8(&gb,
169	s->frame->data[0] + j * s->frame->linesize[0] + i,
170	s->frame->linesize[0], &s->bdsp);
171
172	buf += video_size;
173	} else if (video_type == 2) {
174	int v = *buf++;
175	for (j = 0; j < avctx->height; j++)
176	memset(s->frame->data[0] + j * s->frame->linesize[0],
177	v, avctx->width);
178	} else {
179	av_log(avctx, AV_LOG_WARNING,
180	"unsupported frame type %i\n", video_type);
181	return AVERROR_INVALIDDATA;
182	}
183	}
184
185	if (buf_end - buf >= AVPALETTE_COUNT * 3) {
186	for (i = 0; i < AVPALETTE_COUNT; i++) {
187	uint32_t pal = AV_RB24(buf);
188	s->palette[i] = 0xFFU << 24 \| pal << 2 \| ((pal >> 4) & 0x30303);
189	buf += 3;
190	}
191	s->palette_has_changed = 1;
192	}
193
194	if (video_size) {
195	s->frame->key_frame = 1;
196	s->frame->pict_type = AV_PICTURE_TYPE_I;
197	s->frame->palette_has_changed = s->palette_has_changed;
198	s->palette_has_changed = 0;
199	memcpy(s->frame->data[1], s->palette, AVPALETTE_SIZE);
200
201	if ((ret = av_frame_ref(data, s->frame)) < 0)
202	return ret;
203	*got_frame = 1;
204	}
205
206	return avpkt->size;
207	}
208
209	static av_cold int decode_close(AVCodecContext *avctx)
210	{
211	JvContext *s = avctx->priv_data;
212
213	av_frame_free(&s->frame);
214
215	return 0;
216	}
217
218	AVCodec ff_jv_decoder = {
219	.name = "jv",
220	.long_name = NULL_IF_CONFIG_SMALL("Bitmap Brothers JV video"),
221	.type = AVMEDIA_TYPE_VIDEO,
222	.id = AV_CODEC_ID_JV,
223	.priv_data_size = sizeof(JvContext),
224	.init = decode_init,
225	.close = decode_close,
226	.decode = decode_frame,
227	.capabilities = CODEC_CAP_DR1,
228	};