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

/*
 * Feeble Files/ScummVM DXA decoder
 * Copyright (c) 2007 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
 * DXA Video decoder
 */

#include <stdio.h>
#include <stdlib.h>

#include "libavutil/common.h"
#include "libavutil/intreadwrite.h"
#include "bytestream.h"
#include "avcodec.h"
#include "internal.h"

#include <zlib.h>

/*
 * Decoder context
 */
typedef struct DxaDecContext {
    AVFrame *prev;

    int dsize;
#define DECOMP_BUF_PADDING 16
    uint8_t *decomp_buf;
    uint32_t pal[256];
} DxaDecContext;

static const int shift1[6] = { 0, 8, 8, 8, 4, 4 };
static const int shift2[6] = { 0, 0, 8, 4, 0, 4 };

static int decode_13(AVCodecContext *avctx, DxaDecContext *c, uint8_t* dst,
                     int stride, uint8_t *src, int srcsize, uint8_t *ref)
{
    uint8_t *code, *data, *mv, *msk, *tmp, *tmp2;
    uint8_t *src_end = src + srcsize;
    int i, j, k;
    int type, x, y, d, d2;
    uint32_t mask;

    if (12ULL  + ((avctx->width * avctx->height) >> 4) + AV_RB32(src + 0) + AV_RB32(src + 4) > srcsize)
        return AVERROR_INVALIDDATA;

    code = src  + 12;
    data = code + ((avctx->width * avctx->height) >> 4);
    mv   = data + AV_RB32(src + 0);
    msk  = mv   + AV_RB32(src + 4);

    for(j = 0; j < avctx->height; j += 4){
        for(i = 0; i < avctx->width; i += 4){
            if (data > src_end || mv > src_end || msk > src_end)
                return AVERROR_INVALIDDATA;
            tmp  = dst + i;
            tmp2 = ref + i;
            type = *code++;
            switch(type){
            case 4: // motion compensation
                x = (*mv) >> 4;    if(x & 8) x = 8 - x;
                y = (*mv++) & 0xF; if(y & 8) y = 8 - y;
                if (i < -x || avctx->width  - i - 4 < x ||
                    j < -y || avctx->height - j - 4 < y) {
                    av_log(avctx, AV_LOG_ERROR, "MV %d %d out of bounds\n", x,y);
                    return AVERROR_INVALIDDATA;
                }
                tmp2 += x + y*stride;
            case 0: // skip
            case 5: // skip in method 12
                for(y = 0; y < 4; y++){
                    memcpy(tmp, tmp2, 4);
                    tmp  += stride;
                    tmp2 += stride;
                }
                break;
            case 1:  // masked change
            case 10: // masked change with only half of pixels changed
            case 11: // cases 10-15 are for method 12 only
            case 12:
            case 13:
            case 14:
            case 15:
                if(type == 1){
                    mask = AV_RB16(msk);
                    msk += 2;
                }else{
                    type -= 10;
                    mask = ((msk[0] & 0xF0) << shift1[type]) | ((msk[0] & 0xF) << shift2[type]);
                    msk++;
                }
                for(y = 0; y < 4; y++){
                    for(x = 0; x < 4; x++){
                        tmp[x] = (mask & 0x8000) ? *data++ : tmp2[x];
                        mask <<= 1;
                    }
                    tmp  += stride;
                    tmp2 += stride;
                }
                break;
            case 2: // fill block
                for(y = 0; y < 4; y++){
                    memset(tmp, data[0], 4);
                    tmp += stride;
                }
                data++;
                break;
            case 3: // raw block
                for(y = 0; y < 4; y++){
                    memcpy(tmp, data, 4);
                    data += 4;
                    tmp  += stride;
                }
                break;
            case 8: // subblocks - method 13 only
                mask = *msk++;
                for(k = 0; k < 4; k++){
                    d  = ((k & 1) << 1) + ((k & 2) * stride);
                    d2 = ((k & 1) << 1) + ((k & 2) * stride);
                    tmp2 = ref + i + d2;
                    switch(mask & 0xC0){
                    case 0x80: // motion compensation
                        x = (*mv) >> 4;    if(x & 8) x = 8 - x;
                        y = (*mv++) & 0xF; if(y & 8) y = 8 - y;
                        if (i + 2*(k & 1) < -x || avctx->width  - i - 2*(k & 1) - 2 < x ||
                            j +   (k & 2) < -y || avctx->height - j -   (k & 2) - 2 < y) {
                            av_log(avctx, AV_LOG_ERROR, "MV %d %d out of bounds\n", x,y);
                            return AVERROR_INVALIDDATA;
                        }
                        tmp2 += x + y*stride;
                    case 0x00: // skip
                        tmp[d + 0         ] = tmp2[0];
                        tmp[d + 1         ] = tmp2[1];
                        tmp[d + 0 + stride] = tmp2[0 + stride];
                        tmp[d + 1 + stride] = tmp2[1 + stride];
                        break;
                    case 0x40: // fill
                        tmp[d + 0         ] = data[0];
                        tmp[d + 1         ] = data[0];
                        tmp[d + 0 + stride] = data[0];
                        tmp[d + 1 + stride] = data[0];
                        data++;
                        break;
                    case 0xC0: // raw
                        tmp[d + 0         ] = *data++;
                        tmp[d + 1         ] = *data++;
                        tmp[d + 0 + stride] = *data++;
                        tmp[d + 1 + stride] = *data++;
                        break;
                    }
                    mask <<= 2;
                }
                break;
            case 32: // vector quantization - 2 colors
                mask = AV_RB16(msk);
                msk += 2;
                for(y = 0; y < 4; y++){
                    for(x = 0; x < 4; x++){
                        tmp[x] = data[mask & 1];
                        mask >>= 1;
                    }
                    tmp  += stride;
                    tmp2 += stride;
                }
                data += 2;
                break;
            case 33: // vector quantization - 3 or 4 colors
            case 34:
                mask = AV_RB32(msk);
                msk += 4;
                for(y = 0; y < 4; y++){
                    for(x = 0; x < 4; x++){
                        tmp[x] = data[mask & 3];
                        mask >>= 2;
                    }
                    tmp  += stride;
                    tmp2 += stride;
                }
                data += type - 30;
                break;
            default:
                av_log(avctx, AV_LOG_ERROR, "Unknown opcode %d\n", type);
                return AVERROR_INVALIDDATA;
            }
        }
        dst += stride * 4;
        ref += stride * 4;
    }
    return 0;
}

static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
{
    AVFrame *frame = data;
    DxaDecContext * const c = avctx->priv_data;
    uint8_t *outptr, *srcptr, *tmpptr;
    unsigned long dsize;
    int i, j, compr, ret;
    int stride;
    int pc = 0;
    GetByteContext gb;

    bytestream2_init(&gb, avpkt->data, avpkt->size);

    /* make the palette available on the way out */
    if (bytestream2_peek_le32(&gb) == MKTAG('C','M','A','P')) {
        bytestream2_skip(&gb, 4);
        for(i = 0; i < 256; i++){
            c->pal[i] = 0xFFU << 24 | bytestream2_get_be24(&gb);
        }
        pc = 1;
    }

    if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
        return ret;
    memcpy(frame->data[1], c->pal, AVPALETTE_SIZE);
    frame->palette_has_changed = pc;

    outptr = frame->data[0];
    srcptr = c->decomp_buf;
    tmpptr = c->prev->data[0];
    stride = frame->linesize[0];

    if (bytestream2_get_le32(&gb) == MKTAG('N','U','L','L'))
        compr = -1;
    else
        compr = bytestream2_get_byte(&gb);

    dsize = c->dsize;
    if (compr != 4 && compr != -1) {
        bytestream2_skip(&gb, 4);
        if (uncompress(c->decomp_buf, &dsize, avpkt->data + bytestream2_tell(&gb),
                       bytestream2_get_bytes_left(&gb)) != Z_OK) {
            av_log(avctx, AV_LOG_ERROR, "Uncompress failed!\n");
            return AVERROR_UNKNOWN;
        }
        memset(c->decomp_buf + dsize, 0, DECOMP_BUF_PADDING);
    }

    if (avctx->debug & FF_DEBUG_PICT_INFO)
        av_log(avctx, AV_LOG_DEBUG, "compr:%2d, dsize:%d\n", compr, (int)dsize);

    switch(compr){
    case -1:
        frame->key_frame = 0;
        frame->pict_type = AV_PICTURE_TYPE_P;
        if (c->prev->data[0])
            memcpy(frame->data[0], c->prev->data[0], frame->linesize[0] * avctx->height);
        else{ // Should happen only when first frame is 'NULL'
            memset(frame->data[0], 0, frame->linesize[0] * avctx->height);
            frame->key_frame = 1;
            frame->pict_type = AV_PICTURE_TYPE_I;
        }
        break;
    case 2:
    case 4:
        frame->key_frame = 1;
        frame->pict_type = AV_PICTURE_TYPE_I;
        for (j = 0; j < avctx->height; j++) {
                memcpy(outptr, srcptr, avctx->width);
            outptr += stride;
            srcptr += avctx->width;
        }
        break;
    case 3:
    case 5:
        if (!tmpptr) {
            av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n");
            if (!(avctx->flags2 & CODEC_FLAG2_SHOW_ALL))
                return AVERROR_INVALIDDATA;
        }
        frame->key_frame = 0;
        frame->pict_type = AV_PICTURE_TYPE_P;
        for (j = 0; j < avctx->height; j++) {
            if(tmpptr){
                for(i = 0; i < avctx->width; i++)
                    outptr[i] = srcptr[i] ^ tmpptr[i];
                tmpptr += stride;
            }else
                memcpy(outptr, srcptr, avctx->width);
            outptr += stride;
            srcptr += avctx->width;
        }
        break;
    case 12: // ScummVM coding
    case 13:
        frame->key_frame = 0;
        frame->pict_type = AV_PICTURE_TYPE_P;
        if (!c->prev->data[0]) {
            av_log(avctx, AV_LOG_ERROR, "Missing reference frame\n");
            return AVERROR_INVALIDDATA;
        }
        decode_13(avctx, c, frame->data[0], frame->linesize[0], srcptr, dsize, c->prev->data[0]);
        break;
    default:
        av_log(avctx, AV_LOG_ERROR, "Unknown/unsupported compression type %d\n", compr);
        return AVERROR_INVALIDDATA;
    }

    av_frame_unref(c->prev);
    if ((ret = av_frame_ref(c->prev, frame)) < 0)
        return ret;

    *got_frame = 1;

    /* always report that the buffer was completely consumed */
    return avpkt->size;
}

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

    if (avctx->width%4 || avctx->height%4) {
        avpriv_request_sample(avctx, "dimensions are not a multiple of 4");
        return AVERROR_INVALIDDATA;
    }

    c->prev = av_frame_alloc();
    if (!c->prev)
        return AVERROR(ENOMEM);

    avctx->pix_fmt = AV_PIX_FMT_PAL8;

    c->dsize = avctx->width * avctx->height * 2;
    c->decomp_buf = av_malloc(c->dsize + DECOMP_BUF_PADDING);
    if (!c->decomp_buf) {
        av_frame_free(&c->prev);
        av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
        return AVERROR(ENOMEM);
    }

    return 0;
}

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

    av_freep(&c->decomp_buf);
    av_frame_free(&c->prev);

    return 0;
}

AVCodec ff_dxa_decoder = {
    .name           = "dxa",
    .long_name      = NULL_IF_CONFIG_SMALL("Feeble Files/ScummVM DXA"),
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_DXA,
    .priv_data_size = sizeof(DxaDecContext),
    .init           = decode_init,
    .close          = decode_end,
    .decode         = decode_frame,
    .capabilities   = CODEC_CAP_DR1,
};
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* Feeble Files/ScummVM DXA decoder
	3	* Copyright (c) 2007 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	* DXA Video decoder
	25	*/
	26
	27	#include <stdio.h>
	28	#include <stdlib.h>
	29
	30	#include "libavutil/common.h"
	31	#include "libavutil/intreadwrite.h"
	32	#include "bytestream.h"
	33	#include "avcodec.h"
	34	#include "internal.h"
	35
	36	#include <zlib.h>
	37
	38	/*
	39	* Decoder context
	40	*/
	41	typedef struct DxaDecContext {
	42	AVFrame *prev;
	43
	44	int dsize;
	45	#define DECOMP_BUF_PADDING 16
	46	uint8_t *decomp_buf;
	47	uint32_t pal[256];
	48	} DxaDecContext;
	49
	50	static const int shift1[6] = { 0, 8, 8, 8, 4, 4 };
	51	static const int shift2[6] = { 0, 0, 8, 4, 0, 4 };
	52
	53	static int decode_13(AVCodecContext avctx, DxaDecContext c, uint8_t* dst,
	54	int stride, uint8_t src, int srcsize, uint8_t ref)
	55	{
	56	uint8_t code, data, mv, msk, tmp, tmp2;
	57	uint8_t *src_end = src + srcsize;
	58	int i, j, k;
	59	int type, x, y, d, d2;
	60	uint32_t mask;
	61
	62	if (12ULL + ((avctx->width * avctx->height) >> 4) + AV_RB32(src + 0) + AV_RB32(src + 4) > srcsize)
	63	return AVERROR_INVALIDDATA;
	64
65	code = src + 12;
66	data = code + ((avctx->width * avctx->height) >> 4);
67	mv = data + AV_RB32(src + 0);
68	msk = mv + AV_RB32(src + 4);
69
70	for(j = 0; j < avctx->height; j += 4){
71	for(i = 0; i < avctx->width; i += 4){
72	if (data > src_end \|\| mv > src_end \|\| msk > src_end)
73	return AVERROR_INVALIDDATA;
74	tmp = dst + i;
75	tmp2 = ref + i;
76	type = *code++;
77	switch(type){
78	case 4: // motion compensation
79	x = (*mv) >> 4; if(x & 8) x = 8 - x;
80	y = (*mv++) & 0xF; if(y & 8) y = 8 - y;
81	if (i < -x \|\| avctx->width - i - 4 < x \|\|
82	j < -y \|\| avctx->height - j - 4 < y) {
83	av_log(avctx, AV_LOG_ERROR, "MV %d %d out of bounds\n", x,y);
84	return AVERROR_INVALIDDATA;
85	}
86	tmp2 += x + y*stride;
87	case 0: // skip
88	case 5: // skip in method 12
89	for(y = 0; y < 4; y++){
90	memcpy(tmp, tmp2, 4);
91	tmp += stride;
92	tmp2 += stride;
93	}
94	break;
95	case 1: // masked change
96	case 10: // masked change with only half of pixels changed
97	case 11: // cases 10-15 are for method 12 only
98	case 12:
99	case 13:
100	case 14:
101	case 15:
102	if(type == 1){
103	mask = AV_RB16(msk);
104	msk += 2;
105	}else{
106	type -= 10;
107	mask = ((msk[0] & 0xF0) << shift1[type]) \| ((msk[0] & 0xF) << shift2[type]);
108	msk++;
109	}
110	for(y = 0; y < 4; y++){
111	for(x = 0; x < 4; x++){
112	tmp[x] = (mask & 0x8000) ? *data++ : tmp2[x];
113	mask <<= 1;
114	}
115	tmp += stride;
116	tmp2 += stride;
117	}
118	break;
119	case 2: // fill block
120	for(y = 0; y < 4; y++){
121	memset(tmp, data[0], 4);
122	tmp += stride;
123	}
124	data++;
125	break;
126	case 3: // raw block
127	for(y = 0; y < 4; y++){
128	memcpy(tmp, data, 4);
129	data += 4;
130	tmp += stride;
131	}
132	break;
133	case 8: // subblocks - method 13 only
134	mask = *msk++;
135	for(k = 0; k < 4; k++){
136	d = ((k & 1) << 1) + ((k & 2) * stride);
137	d2 = ((k & 1) << 1) + ((k & 2) * stride);
138	tmp2 = ref + i + d2;
139	switch(mask & 0xC0){
140	case 0x80: // motion compensation
141	x = (*mv) >> 4; if(x & 8) x = 8 - x;
142	y = (*mv++) & 0xF; if(y & 8) y = 8 - y;
143	if (i + 2(k & 1) < -x \|\| avctx->width - i - 2(k & 1) - 2 < x \|\|
144	j + (k & 2) < -y \|\| avctx->height - j - (k & 2) - 2 < y) {
145	av_log(avctx, AV_LOG_ERROR, "MV %d %d out of bounds\n", x,y);
146	return AVERROR_INVALIDDATA;
147	}
148	tmp2 += x + y*stride;
149	case 0x00: // skip
150	tmp[d + 0 ] = tmp2[0];
151	tmp[d + 1 ] = tmp2[1];
152	tmp[d + 0 + stride] = tmp2[0 + stride];
153	tmp[d + 1 + stride] = tmp2[1 + stride];
154	break;
155	case 0x40: // fill
156	tmp[d + 0 ] = data[0];
157	tmp[d + 1 ] = data[0];
158	tmp[d + 0 + stride] = data[0];
159	tmp[d + 1 + stride] = data[0];
160	data++;
161	break;
162	case 0xC0: // raw
163	tmp[d + 0 ] = *data++;
164	tmp[d + 1 ] = *data++;
165	tmp[d + 0 + stride] = *data++;
166	tmp[d + 1 + stride] = *data++;
167	break;
168	}
169	mask <<= 2;
170	}
171	break;
172	case 32: // vector quantization - 2 colors
173	mask = AV_RB16(msk);
174	msk += 2;
175	for(y = 0; y < 4; y++){
176	for(x = 0; x < 4; x++){
177	tmp[x] = data[mask & 1];
178	mask >>= 1;
179	}
180	tmp += stride;
181	tmp2 += stride;
182	}
183	data += 2;
184	break;
185	case 33: // vector quantization - 3 or 4 colors
186	case 34:
187	mask = AV_RB32(msk);
188	msk += 4;
189	for(y = 0; y < 4; y++){
190	for(x = 0; x < 4; x++){
191	tmp[x] = data[mask & 3];
192	mask >>= 2;
193	}
194	tmp += stride;
195	tmp2 += stride;
196	}
197	data += type - 30;
198	break;
199	default:
200	av_log(avctx, AV_LOG_ERROR, "Unknown opcode %d\n", type);
201	return AVERROR_INVALIDDATA;
202	}
203	}
204	dst += stride * 4;
205	ref += stride * 4;
206	}
207	return 0;
208	}
209
210	static int decode_frame(AVCodecContext avctx, void data, int got_frame, AVPacket avpkt)
211	{
212	AVFrame *frame = data;
213	DxaDecContext * const c = avctx->priv_data;
214	uint8_t outptr, srcptr, *tmpptr;
215	unsigned long dsize;
216	int i, j, compr, ret;
217	int stride;
218	int pc = 0;
219	GetByteContext gb;
220
221	bytestream2_init(&gb, avpkt->data, avpkt->size);
222
223	/* make the palette available on the way out */
224	if (bytestream2_peek_le32(&gb) == MKTAG('C','M','A','P')) {
225	bytestream2_skip(&gb, 4);
226	for(i = 0; i < 256; i++){
227	c->pal[i] = 0xFFU << 24 \| bytestream2_get_be24(&gb);
228	}
229	pc = 1;
230	}
231
232	if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
233	return ret;
234	memcpy(frame->data[1], c->pal, AVPALETTE_SIZE);
235	frame->palette_has_changed = pc;
236
237	outptr = frame->data[0];
238	srcptr = c->decomp_buf;
239	tmpptr = c->prev->data[0];
240	stride = frame->linesize[0];
241
242	if (bytestream2_get_le32(&gb) == MKTAG('N','U','L','L'))
243	compr = -1;
244	else
245	compr = bytestream2_get_byte(&gb);
246
247	dsize = c->dsize;
248	if (compr != 4 && compr != -1) {
249	bytestream2_skip(&gb, 4);
250	if (uncompress(c->decomp_buf, &dsize, avpkt->data + bytestream2_tell(&gb),
251	bytestream2_get_bytes_left(&gb)) != Z_OK) {
252	av_log(avctx, AV_LOG_ERROR, "Uncompress failed!\n");
253	return AVERROR_UNKNOWN;
254	}
255	memset(c->decomp_buf + dsize, 0, DECOMP_BUF_PADDING);
256	}
257
258	if (avctx->debug & FF_DEBUG_PICT_INFO)
259	av_log(avctx, AV_LOG_DEBUG, "compr:%2d, dsize:%d\n", compr, (int)dsize);
260
261	switch(compr){
262	case -1:
263	frame->key_frame = 0;
264	frame->pict_type = AV_PICTURE_TYPE_P;
265	if (c->prev->data[0])
266	memcpy(frame->data[0], c->prev->data[0], frame->linesize[0] * avctx->height);
267	else{ // Should happen only when first frame is 'NULL'
268	memset(frame->data[0], 0, frame->linesize[0] * avctx->height);
269	frame->key_frame = 1;
270	frame->pict_type = AV_PICTURE_TYPE_I;
271	}
272	break;
273	case 2:
274	case 4:
275	frame->key_frame = 1;
276	frame->pict_type = AV_PICTURE_TYPE_I;
277	for (j = 0; j < avctx->height; j++) {
278	memcpy(outptr, srcptr, avctx->width);
279	outptr += stride;
280	srcptr += avctx->width;
281	}
282	break;
283	case 3:
284	case 5:
285	if (!tmpptr) {
286	av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n");
287	if (!(avctx->flags2 & CODEC_FLAG2_SHOW_ALL))
288	return AVERROR_INVALIDDATA;
289	}
290	frame->key_frame = 0;
291	frame->pict_type = AV_PICTURE_TYPE_P;
292	for (j = 0; j < avctx->height; j++) {
293	if(tmpptr){
294	for(i = 0; i < avctx->width; i++)
295	outptr[i] = srcptr[i] ^ tmpptr[i];
296	tmpptr += stride;
297	}else
298	memcpy(outptr, srcptr, avctx->width);
299	outptr += stride;
300	srcptr += avctx->width;
301	}
302	break;
303	case 12: // ScummVM coding
304	case 13:
305	frame->key_frame = 0;
306	frame->pict_type = AV_PICTURE_TYPE_P;
307	if (!c->prev->data[0]) {
308	av_log(avctx, AV_LOG_ERROR, "Missing reference frame\n");
309	return AVERROR_INVALIDDATA;
310	}
311	decode_13(avctx, c, frame->data[0], frame->linesize[0], srcptr, dsize, c->prev->data[0]);
312	break;
313	default:
314	av_log(avctx, AV_LOG_ERROR, "Unknown/unsupported compression type %d\n", compr);
315	return AVERROR_INVALIDDATA;
316	}
317
318	av_frame_unref(c->prev);
319	if ((ret = av_frame_ref(c->prev, frame)) < 0)
320	return ret;
321
322	*got_frame = 1;
323
324	/* always report that the buffer was completely consumed */
325	return avpkt->size;
326	}
327
328	static av_cold int decode_init(AVCodecContext *avctx)
329	{
330	DxaDecContext * const c = avctx->priv_data;
331
332	if (avctx->width%4 \|\| avctx->height%4) {
333	avpriv_request_sample(avctx, "dimensions are not a multiple of 4");
334	return AVERROR_INVALIDDATA;
335	}
336
337	c->prev = av_frame_alloc();
338	if (!c->prev)
339	return AVERROR(ENOMEM);
340
341	avctx->pix_fmt = AV_PIX_FMT_PAL8;
342
343	c->dsize = avctx->width * avctx->height * 2;
344	c->decomp_buf = av_malloc(c->dsize + DECOMP_BUF_PADDING);
345	if (!c->decomp_buf) {
346	av_frame_free(&c->prev);
347	av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
348	return AVERROR(ENOMEM);
349	}
350
351	return 0;
352	}
353
354	static av_cold int decode_end(AVCodecContext *avctx)
355	{
356	DxaDecContext * const c = avctx->priv_data;
357
358	av_freep(&c->decomp_buf);
359	av_frame_free(&c->prev);
360
361	return 0;
362	}
363
364	AVCodec ff_dxa_decoder = {
365	.name = "dxa",
366	.long_name = NULL_IF_CONFIG_SMALL("Feeble Files/ScummVM DXA"),
367	.type = AVMEDIA_TYPE_VIDEO,
368	.id = AV_CODEC_ID_DXA,
369	.priv_data_size = sizeof(DxaDecContext),
370	.init = decode_init,
371	.close = decode_end,
372	.decode = decode_frame,
373	.capabilities = CODEC_CAP_DR1,
374	};