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

/*
 * Electronic Arts TGV Video Decoder
 * Copyright (c) 2007-2008 Peter Ross
 *
 * 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 St, Fifth Floor, Boston, MA  02110-1301  USA
 */

/**
 * @file
 * Electronic Arts TGV Video Decoder
 * by Peter Ross (pross@xvid.org)
 *
 * Technical details here:
 * http://wiki.multimedia.cx/index.php?title=Electronic_Arts_TGV
 */

#include "avcodec.h"
#define BITSTREAM_READER_LE
#include "get_bits.h"
#include "internal.h"
#include "libavutil/imgutils.h"
#include "libavutil/mem.h"

#define EA_PREAMBLE_SIZE    8
#define kVGT_TAG MKTAG('k', 'V', 'G', 'T')

typedef struct TgvContext {
    AVCodecContext *avctx;
    AVFrame *last_frame;
    uint8_t *frame_buffer;
    int width,height;
    uint32_t palette[AVPALETTE_COUNT];

    int (*mv_codebook)[2];
    uint8_t (*block_codebook)[16];
    int num_mvs;           ///< current length of mv_codebook
    int num_blocks_packed; ///< current length of block_codebook
} TgvContext;

static av_cold int tgv_decode_init(AVCodecContext *avctx)
{
    TgvContext *s = avctx->priv_data;
    s->avctx         = avctx;
    avctx->framerate = (AVRational){ 15, 1 };
    avctx->pix_fmt   = AV_PIX_FMT_PAL8;

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

    return 0;
}

/**
 * Unpack buffer
 * @return 0 on success, -1 on critical buffer underflow
 */
static int unpack(const uint8_t *src, const uint8_t *src_end,
                  uint8_t *dst, int width, int height)
{
    uint8_t *dst_end = dst + width*height;
    int size, size1, size2, offset, run;
    uint8_t *dst_start = dst;

    if (src[0] & 0x01)
        src += 5;
    else
        src += 2;

    if (src_end - src < 3)
        return AVERROR_INVALIDDATA;
    size = AV_RB24(src);
    src += 3;

    while (size > 0 && src < src_end) {

        /* determine size1 and size2 */
        size1 = (src[0] & 3);
        if (src[0] & 0x80) {  // 1
            if (src[0] & 0x40 ) {  // 11
                if (src[0] & 0x20) {  // 111
                    if (src[0] < 0xFC)  // !(111111)
                        size1 = (((src[0] & 31) + 1) << 2);
                    src++;
                    size2 = 0;
                } else {  // 110
                    offset = ((src[0] & 0x10) << 12) + AV_RB16(&src[1]) + 1;
                    size2  = ((src[0] & 0xC) << 6) + src[3] + 5;
                    src   += 4;
                }
            } else {  // 10
                size1  = ((src[1] & 0xC0) >> 6);
                offset = (AV_RB16(&src[1]) & 0x3FFF) + 1;
                size2  = (src[0] & 0x3F) + 4;
                src   += 3;
            }
        } else {  // 0
            offset = ((src[0] & 0x60) << 3) + src[1] + 1;
            size2  = ((src[0] & 0x1C) >> 2) + 3;
            src   += 2;
        }


        /* fetch strip from src */
        if (size1 > src_end - src)
            break;

        if (size1 > 0) {
            size -= size1;
            run   = FFMIN(size1, dst_end - dst);
            memcpy(dst, src, run);
            dst += run;
            src += run;
        }

        if (size2 > 0) {
            if (dst - dst_start < offset)
                return 0;
            size -= size2;
            run   = FFMIN(size2, dst_end - dst);
            av_memcpy_backptr(dst, offset, run);
            dst += run;
        }
    }

    return 0;
}

/**
 * Decode inter-frame
 * @return 0 on success, -1 on critical buffer underflow
 */
static int tgv_decode_inter(TgvContext *s, AVFrame *frame,
                            const uint8_t *buf, const uint8_t *buf_end)
{
    int num_mvs;
    int num_blocks_raw;
    int num_blocks_packed;
    int vector_bits;
    int i,j,x,y;
    GetBitContext gb;
    int mvbits;
    const uint8_t *blocks_raw;

    if(buf_end - buf < 12)
        return AVERROR_INVALIDDATA;

    num_mvs           = AV_RL16(&buf[0]);
    num_blocks_raw    = AV_RL16(&buf[2]);
    num_blocks_packed = AV_RL16(&buf[4]);
    vector_bits       = AV_RL16(&buf[6]);
    buf += 12;

    if (vector_bits > MIN_CACHE_BITS || !vector_bits) {
        av_log(s->avctx, AV_LOG_ERROR,
               "Invalid value for motion vector bits: %d\n", vector_bits);
        return AVERROR_INVALIDDATA;
    }

    /* allocate codebook buffers as necessary */
    if (num_mvs > s->num_mvs) {
        if (av_reallocp_array(&s->mv_codebook, num_mvs, sizeof(*s->mv_codebook))) {
            s->num_mvs = 0;
            return AVERROR(ENOMEM);
        }
        s->num_mvs = num_mvs;
    }

    if (num_blocks_packed > s->num_blocks_packed) {
        int err;
        if ((err = av_reallocp(&s->block_codebook, num_blocks_packed * 16)) < 0) {
            s->num_blocks_packed = 0;
            return err;
        }
        s->num_blocks_packed = num_blocks_packed;
    }

    /* read motion vectors */
    mvbits = (num_mvs * 2 * 10 + 31) & ~31;

    if (buf_end - buf < (mvbits>>3) + 16*num_blocks_raw + 8*num_blocks_packed)
        return AVERROR_INVALIDDATA;

    init_get_bits(&gb, buf, mvbits);
    for (i = 0; i < num_mvs; i++) {
        s->mv_codebook[i][0] = get_sbits(&gb, 10);
        s->mv_codebook[i][1] = get_sbits(&gb, 10);
    }
    buf += mvbits >> 3;

    /* note ptr to uncompressed blocks */
    blocks_raw = buf;
    buf       += num_blocks_raw * 16;

    /* read compressed blocks */
    init_get_bits(&gb, buf, (buf_end - buf) << 3);
    for (i = 0; i < num_blocks_packed; i++) {
        int tmp[4];
        for (j = 0; j < 4; j++)
            tmp[j] = get_bits(&gb, 8);
        for (j = 0; j < 16; j++)
            s->block_codebook[i][15-j] = tmp[get_bits(&gb, 2)];
    }

    if (get_bits_left(&gb) < vector_bits *
        (s->avctx->height / 4) * (s->avctx->width / 4))
        return AVERROR_INVALIDDATA;

    /* read vectors and build frame */
    for (y = 0; y < s->avctx->height / 4; y++)
        for (x = 0; x < s->avctx->width / 4; x++) {
            unsigned int vector = get_bits(&gb, vector_bits);
            const uint8_t *src;
            int src_stride;

            if (vector < num_mvs) {
                int mx = x * 4 + s->mv_codebook[vector][0];
                int my = y * 4 + s->mv_codebook[vector][1];

                if (mx < 0 || mx + 4 > s->avctx->width ||
                    my < 0 || my + 4 > s->avctx->height) {
                    av_log(s->avctx, AV_LOG_ERROR, "MV %d %d out of picture\n", mx, my);
                    continue;
                }

                src = s->last_frame->data[0] + mx + my * s->last_frame->linesize[0];
                src_stride = s->last_frame->linesize[0];
            } else {
                int offset = vector - num_mvs;
                if (offset < num_blocks_raw)
                    src = blocks_raw + 16*offset;
                else if (offset - num_blocks_raw < num_blocks_packed)
                    src = s->block_codebook[offset - num_blocks_raw];
                else
                    continue;
                src_stride = 4;
            }

            for (j = 0; j < 4; j++)
                for (i = 0; i < 4; i++)
                    frame->data[0][(y * 4 + j) * frame->linesize[0] + (x * 4 + i)] =
                        src[j * src_stride + i];
    }

    return 0;
}

static int tgv_decode_frame(AVCodecContext *avctx,
                            void *data, int *got_frame,
                            AVPacket *avpkt)
{
    const uint8_t *buf     = avpkt->data;
    int buf_size           = avpkt->size;
    TgvContext *s          = avctx->priv_data;
    const uint8_t *buf_end = buf + buf_size;
    AVFrame *frame         = data;
    int chunk_type, ret;

    if (buf_end - buf < EA_PREAMBLE_SIZE)
        return AVERROR_INVALIDDATA;

    chunk_type = AV_RL32(&buf[0]);
    buf       += EA_PREAMBLE_SIZE;

    if (chunk_type == kVGT_TAG) {
        int pal_count, i;
        if(buf_end - buf < 12) {
            av_log(avctx, AV_LOG_WARNING, "truncated header\n");
            return AVERROR_INVALIDDATA;
        }

        s->width  = AV_RL16(&buf[0]);
        s->height = AV_RL16(&buf[2]);
        if (s->avctx->width != s->width || s->avctx->height != s->height) {
            av_freep(&s->frame_buffer);
            av_frame_unref(s->last_frame);
            if ((ret = ff_set_dimensions(s->avctx, s->width, s->height)) < 0)
                return ret;
        }

        pal_count = AV_RL16(&buf[6]);
        buf += 12;
        for(i = 0; i < pal_count && i < AVPALETTE_COUNT && buf_end - buf >= 3; i++) {
            s->palette[i] = 0xFFU << 24 | AV_RB24(buf);
            buf += 3;
        }
    }

    if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
        return ret;

    memcpy(frame->data[1], s->palette, AVPALETTE_SIZE);

    if (chunk_type == kVGT_TAG) {
        int y;
        frame->key_frame = 1;
        frame->pict_type = AV_PICTURE_TYPE_I;

        if (!s->frame_buffer &&
            !(s->frame_buffer = av_mallocz(s->width * s->height)))
            return AVERROR(ENOMEM);

        if (unpack(buf, buf_end, s->frame_buffer, s->avctx->width, s->avctx->height) < 0) {
            av_log(avctx, AV_LOG_WARNING, "truncated intra frame\n");
            return AVERROR_INVALIDDATA;
        }
        for (y = 0; y < s->height; y++)
            memcpy(frame->data[0]  + y * frame->linesize[0],
                   s->frame_buffer + y * s->width,
                   s->width);
    } else {
        if (!s->last_frame->data[0]) {
            av_log(avctx, AV_LOG_WARNING, "inter frame without corresponding intra frame\n");
            return buf_size;
        }
        frame->key_frame = 0;
        frame->pict_type = AV_PICTURE_TYPE_P;
        if (tgv_decode_inter(s, frame, buf, buf_end) < 0) {
            av_log(avctx, AV_LOG_WARNING, "truncated inter frame\n");
            return AVERROR_INVALIDDATA;
        }
    }

    av_frame_unref(s->last_frame);
    if ((ret = av_frame_ref(s->last_frame, frame)) < 0)
        return ret;

    *got_frame = 1;

    return buf_size;
}

static av_cold int tgv_decode_end(AVCodecContext *avctx)
{
    TgvContext *s = avctx->priv_data;
    av_frame_free(&s->last_frame);
    av_freep(&s->frame_buffer);
    av_freep(&s->mv_codebook);
    av_freep(&s->block_codebook);
    return 0;
}

AVCodec ff_eatgv_decoder = {
    .name           = "eatgv",
    .long_name      = NULL_IF_CONFIG_SMALL("Electronic Arts TGV video"),
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_TGV,
    .priv_data_size = sizeof(TgvContext),
    .init           = tgv_decode_init,
    .close          = tgv_decode_end,
    .decode         = tgv_decode_frame,
    .capabilities   = CODEC_CAP_DR1,
};
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* Electronic Arts TGV Video Decoder
	3	* Copyright (c) 2007-2008 Peter Ross
	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 St, Fifth Floor, Boston, MA 02110-1301 USA
	20	*/
	21
	22	/**
	23	* @file
	24	* Electronic Arts TGV Video Decoder
	25	* by Peter Ross (pross@xvid.org)
	26	*
	27	* Technical details here:
	28	* http://wiki.multimedia.cx/index.php?title=Electronic_Arts_TGV
	29	*/
	30
	31	#include "avcodec.h"
	32	#define BITSTREAM_READER_LE
	33	#include "get_bits.h"
	34	#include "internal.h"
	35	#include "libavutil/imgutils.h"
	36	#include "libavutil/mem.h"
	37
	38	#define EA_PREAMBLE_SIZE 8
	39	#define kVGT_TAG MKTAG('k', 'V', 'G', 'T')
	40
	41	typedef struct TgvContext {
	42	AVCodecContext *avctx;
	43	AVFrame *last_frame;
	44	uint8_t *frame_buffer;
	45	int width,height;
	46	uint32_t palette[AVPALETTE_COUNT];
	47
	48	int (*mv_codebook)[2];
	49	uint8_t (*block_codebook)[16];
	50	int num_mvs; ///< current length of mv_codebook
	51	int num_blocks_packed; ///< current length of block_codebook
	52	} TgvContext;
	53
	54	static av_cold int tgv_decode_init(AVCodecContext *avctx)
	55	{
	56	TgvContext *s = avctx->priv_data;
	57	s->avctx = avctx;
f6fa7814	58	avctx->framerate = (AVRational){ 15, 1 };
2ba45a60 DM	59	avctx->pix_fmt = AV_PIX_FMT_PAL8;
	60
	61	s->last_frame = av_frame_alloc();
	62	if (!s->last_frame)
	63	return AVERROR(ENOMEM);
	64
	65	return 0;
	66	}
	67
	68	/**
	69	* Unpack buffer
	70	* @return 0 on success, -1 on critical buffer underflow
	71	*/
	72	static int unpack(const uint8_t src, const uint8_t src_end,
	73	uint8_t *dst, int width, int height)
	74	{
	75	uint8_t dst_end = dst + widthheight;
	76	int size, size1, size2, offset, run;
	77	uint8_t *dst_start = dst;
	78
	79	if (src[0] & 0x01)
	80	src += 5;
	81	else
	82	src += 2;
	83
	84	if (src_end - src < 3)
	85	return AVERROR_INVALIDDATA;
	86	size = AV_RB24(src);
	87	src += 3;
	88
	89	while (size > 0 && src < src_end) {
	90
	91	/* determine size1 and size2 */
	92	size1 = (src[0] & 3);
	93	if (src[0] & 0x80) { // 1
	94	if (src[0] & 0x40 ) { // 11
	95	if (src[0] & 0x20) { // 111
	96	if (src[0] < 0xFC) // !(111111)
	97	size1 = (((src[0] & 31) + 1) << 2);
	98	src++;
	99	size2 = 0;
	100	} else { // 110
	101	offset = ((src[0] & 0x10) << 12) + AV_RB16(&src[1]) + 1;
	102	size2 = ((src[0] & 0xC) << 6) + src[3] + 5;
	103	src += 4;
	104	}
	105	} else { // 10
	106	size1 = ((src[1] & 0xC0) >> 6);
	107	offset = (AV_RB16(&src[1]) & 0x3FFF) + 1;
	108	size2 = (src[0] & 0x3F) + 4;
	109	src += 3;
	110	}
	111	} else { // 0
	112	offset = ((src[0] & 0x60) << 3) + src[1] + 1;
	113	size2 = ((src[0] & 0x1C) >> 2) + 3;
	114	src += 2;
	115	}
	116
	117
	118	/* fetch strip from src */
	119	if (size1 > src_end - src)
	120	break;
	121
	122	if (size1 > 0) {
123	size -= size1;
124	run = FFMIN(size1, dst_end - dst);
125	memcpy(dst, src, run);
126	dst += run;
127	src += run;
128	}
129
130	if (size2 > 0) {
131	if (dst - dst_start < offset)
132	return 0;
133	size -= size2;
134	run = FFMIN(size2, dst_end - dst);
135	av_memcpy_backptr(dst, offset, run);
136	dst += run;
137	}
138	}
139
140	return 0;
141	}
142
143	/**
144	* Decode inter-frame
145	* @return 0 on success, -1 on critical buffer underflow
146	*/
147	static int tgv_decode_inter(TgvContext s, AVFrame frame,
148	const uint8_t buf, const uint8_t buf_end)
149	{
150	int num_mvs;
151	int num_blocks_raw;
152	int num_blocks_packed;
153	int vector_bits;
154	int i,j,x,y;
155	GetBitContext gb;
156	int mvbits;
157	const uint8_t *blocks_raw;
158
159	if(buf_end - buf < 12)
160	return AVERROR_INVALIDDATA;
161
162	num_mvs = AV_RL16(&buf[0]);
163	num_blocks_raw = AV_RL16(&buf[2]);
164	num_blocks_packed = AV_RL16(&buf[4]);
165	vector_bits = AV_RL16(&buf[6]);
166	buf += 12;
167
168	if (vector_bits > MIN_CACHE_BITS \|\| !vector_bits) {
169	av_log(s->avctx, AV_LOG_ERROR,
170	"Invalid value for motion vector bits: %d\n", vector_bits);
171	return AVERROR_INVALIDDATA;
172	}
173
174	/* allocate codebook buffers as necessary */
175	if (num_mvs > s->num_mvs) {
176	if (av_reallocp_array(&s->mv_codebook, num_mvs, sizeof(*s->mv_codebook))) {
177	s->num_mvs = 0;
178	return AVERROR(ENOMEM);
179	}
180	s->num_mvs = num_mvs;
181	}
182
183	if (num_blocks_packed > s->num_blocks_packed) {
184	int err;
185	if ((err = av_reallocp(&s->block_codebook, num_blocks_packed * 16)) < 0) {
186	s->num_blocks_packed = 0;
187	return err;
188	}
189	s->num_blocks_packed = num_blocks_packed;
190	}
191
192	/* read motion vectors */
193	mvbits = (num_mvs * 2 * 10 + 31) & ~31;
194
195	if (buf_end - buf < (mvbits>>3) + 16num_blocks_raw + 8num_blocks_packed)
196	return AVERROR_INVALIDDATA;
197
198	init_get_bits(&gb, buf, mvbits);
199	for (i = 0; i < num_mvs; i++) {
200	s->mv_codebook[i][0] = get_sbits(&gb, 10);
201	s->mv_codebook[i][1] = get_sbits(&gb, 10);
202	}
203	buf += mvbits >> 3;
204
205	/* note ptr to uncompressed blocks */
206	blocks_raw = buf;
207	buf += num_blocks_raw * 16;
208
209	/* read compressed blocks */
210	init_get_bits(&gb, buf, (buf_end - buf) << 3);
211	for (i = 0; i < num_blocks_packed; i++) {
212	int tmp[4];
213	for (j = 0; j < 4; j++)
214	tmp[j] = get_bits(&gb, 8);
215	for (j = 0; j < 16; j++)
216	s->block_codebook[i][15-j] = tmp[get_bits(&gb, 2)];
217	}
218
219	if (get_bits_left(&gb) < vector_bits *
220	(s->avctx->height / 4) * (s->avctx->width / 4))
221	return AVERROR_INVALIDDATA;
222
223	/* read vectors and build frame */
224	for (y = 0; y < s->avctx->height / 4; y++)
225	for (x = 0; x < s->avctx->width / 4; x++) {
226	unsigned int vector = get_bits(&gb, vector_bits);
227	const uint8_t *src;
228	int src_stride;
229
230	if (vector < num_mvs) {
231	int mx = x * 4 + s->mv_codebook[vector][0];
232	int my = y * 4 + s->mv_codebook[vector][1];
233
234	if (mx < 0 \|\| mx + 4 > s->avctx->width \|\|
235	my < 0 \|\| my + 4 > s->avctx->height) {
236	av_log(s->avctx, AV_LOG_ERROR, "MV %d %d out of picture\n", mx, my);
237	continue;
238	}
239
240	src = s->last_frame->data[0] + mx + my * s->last_frame->linesize[0];
241	src_stride = s->last_frame->linesize[0];
242	} else {
243	int offset = vector - num_mvs;
244	if (offset < num_blocks_raw)
245	src = blocks_raw + 16*offset;
246	else if (offset - num_blocks_raw < num_blocks_packed)
247	src = s->block_codebook[offset - num_blocks_raw];
248	else
249	continue;
250	src_stride = 4;
251	}
252
253	for (j = 0; j < 4; j++)
254	for (i = 0; i < 4; i++)
255	frame->data[0][(y * 4 + j) * frame->linesize[0] + (x * 4 + i)] =
256	src[j * src_stride + i];
257	}
258
259	return 0;
260	}
261
262	static int tgv_decode_frame(AVCodecContext *avctx,
263	void data, int got_frame,
264	AVPacket *avpkt)
265	{
266	const uint8_t *buf = avpkt->data;
267	int buf_size = avpkt->size;
268	TgvContext *s = avctx->priv_data;
269	const uint8_t *buf_end = buf + buf_size;
270	AVFrame *frame = data;
271	int chunk_type, ret;
272
273	if (buf_end - buf < EA_PREAMBLE_SIZE)
274	return AVERROR_INVALIDDATA;
275
276	chunk_type = AV_RL32(&buf[0]);
277	buf += EA_PREAMBLE_SIZE;
278
279	if (chunk_type == kVGT_TAG) {
280	int pal_count, i;
281	if(buf_end - buf < 12) {
282	av_log(avctx, AV_LOG_WARNING, "truncated header\n");
283	return AVERROR_INVALIDDATA;
284	}
285
286	s->width = AV_RL16(&buf[0]);
287	s->height = AV_RL16(&buf[2]);
288	if (s->avctx->width != s->width \|\| s->avctx->height != s->height) {
289	av_freep(&s->frame_buffer);
290	av_frame_unref(s->last_frame);
291	if ((ret = ff_set_dimensions(s->avctx, s->width, s->height)) < 0)
292	return ret;
293	}
294
295	pal_count = AV_RL16(&buf[6]);
296	buf += 12;
297	for(i = 0; i < pal_count && i < AVPALETTE_COUNT && buf_end - buf >= 3; i++) {
298	s->palette[i] = 0xFFU << 24 \| AV_RB24(buf);
299	buf += 3;
300	}
301	}
302
303	if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
304	return ret;
305
306	memcpy(frame->data[1], s->palette, AVPALETTE_SIZE);
307
308	if (chunk_type == kVGT_TAG) {
309	int y;
310	frame->key_frame = 1;
311	frame->pict_type = AV_PICTURE_TYPE_I;
312
313	if (!s->frame_buffer &&
314	!(s->frame_buffer = av_mallocz(s->width * s->height)))
315	return AVERROR(ENOMEM);
316
317	if (unpack(buf, buf_end, s->frame_buffer, s->avctx->width, s->avctx->height) < 0) {
318	av_log(avctx, AV_LOG_WARNING, "truncated intra frame\n");
319	return AVERROR_INVALIDDATA;
320	}
321	for (y = 0; y < s->height; y++)
322	memcpy(frame->data[0] + y * frame->linesize[0],
323	s->frame_buffer + y * s->width,
324	s->width);
325	} else {
326	if (!s->last_frame->data[0]) {
327	av_log(avctx, AV_LOG_WARNING, "inter frame without corresponding intra frame\n");
328	return buf_size;
329	}
330	frame->key_frame = 0;
331	frame->pict_type = AV_PICTURE_TYPE_P;
332	if (tgv_decode_inter(s, frame, buf, buf_end) < 0) {
333	av_log(avctx, AV_LOG_WARNING, "truncated inter frame\n");
334	return AVERROR_INVALIDDATA;
335	}
336	}
337
338	av_frame_unref(s->last_frame);
339	if ((ret = av_frame_ref(s->last_frame, frame)) < 0)
340	return ret;
341
342	*got_frame = 1;
343
344	return buf_size;
345	}
346
347	static av_cold int tgv_decode_end(AVCodecContext *avctx)
348	{
349	TgvContext *s = avctx->priv_data;
350	av_frame_free(&s->last_frame);
351	av_freep(&s->frame_buffer);
f6fa7814 DM	352	av_freep(&s->mv_codebook);
f6fa7814 DM	353	av_freep(&s->block_codebook);
2ba45a60 DM	354	return 0;
	355	}
	356
	357	AVCodec ff_eatgv_decoder = {
	358	.name = "eatgv",
	359	.long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TGV video"),
	360	.type = AVMEDIA_TYPE_VIDEO,
	361	.id = AV_CODEC_ID_TGV,
	362	.priv_data_size = sizeof(TgvContext),
	363	.init = tgv_decode_init,
	364	.close = tgv_decode_end,
	365	.decode = tgv_decode_frame,
	366	.capabilities = CODEC_CAP_DR1,
	367	};