libavcodec/pafvideo.c - nest-android-app/ffmpeg - Git at Google

 /*
  * Packed Animation File video decoder
  * Copyright (c) 2012 Paul B Mahol
  *
  * 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
  */

 #include "libavutil/imgutils.h"

 #include "avcodec.h"
 #include "bytestream.h"
 #include "copy_block.h"
 #include "internal.h"


 static const uint8_t block_sequences[16][8] = {
     { 0, 0, 0, 0, 0, 0, 0, 0 },
     { 2, 0, 0, 0, 0, 0, 0, 0 },
     { 5, 7, 0, 0, 0, 0, 0, 0 },
     { 5, 0, 0, 0, 0, 0, 0, 0 },
     { 6, 0, 0, 0, 0, 0, 0, 0 },
     { 5, 7, 5, 7, 0, 0, 0, 0 },
     { 5, 7, 5, 0, 0, 0, 0, 0 },
     { 5, 7, 6, 0, 0, 0, 0, 0 },
     { 5, 5, 0, 0, 0, 0, 0, 0 },
     { 3, 0, 0, 0, 0, 0, 0, 0 },
     { 6, 6, 0, 0, 0, 0, 0, 0 },
     { 2, 4, 0, 0, 0, 0, 0, 0 },
     { 2, 4, 5, 7, 0, 0, 0, 0 },
     { 2, 4, 5, 0, 0, 0, 0, 0 },
     { 2, 4, 6, 0, 0, 0, 0, 0 },
     { 2, 4, 5, 7, 5, 7, 0, 0 },
 };

 typedef struct PAFVideoDecContext {
     AVFrame  *pic;
     GetByteContext gb;

     int width;
     int height;

     int current_frame;
     uint8_t *frame[4];
     int frame_size;
     int video_size;

     uint8_t *opcodes;
 } PAFVideoDecContext;

 static av_cold int paf_video_close(AVCodecContext *avctx)
 {
     PAFVideoDecContext *c = avctx->priv_data;
     int i;

     av_frame_free(&c->pic);

     for (i = 0; i < 4; i++)
         av_freep(&c->frame[i]);

     return 0;
 }

 static av_cold int paf_video_init(AVCodecContext *avctx)
 {
     PAFVideoDecContext *c = avctx->priv_data;
     int i;

     c->width  = avctx->width;
     c->height = avctx->height;

     if (avctx->height & 3 || avctx->width & 3) {
         av_log(avctx, AV_LOG_ERROR,
                "width %d and height %d must be multiplie of 4.\n",
                avctx->width, avctx->height);
         return AVERROR_INVALIDDATA;
     }

     avctx->pix_fmt = AV_PIX_FMT_PAL8;

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

     c->frame_size = avctx->width * FFALIGN(avctx->height, 256);
     c->video_size = avctx->width * avctx->height;
     for (i = 0; i < 4; i++) {
         c->frame[i] = av_mallocz(c->frame_size);
         if (!c->frame[i]) {
             paf_video_close(avctx);
             return AVERROR(ENOMEM);
         }
     }

     return 0;
 }

 static void read4x4block(PAFVideoDecContext *c, uint8_t *dst, int width)
 {
     int i;

     for (i = 0; i < 4; i++) {
         bytestream2_get_buffer(&c->gb, dst, 4);
         dst += width;
     }
 }

 static void copy_color_mask(uint8_t *dst, int width, uint8_t mask, uint8_t color)
 {
     int i;

     for (i = 0; i < 4; i++) {
         if (mask & (1 << 7 - i))
             dst[i] = color;
         if (mask & (1 << 3 - i))
             dst[width + i] = color;
     }
 }

 static void copy_src_mask(uint8_t *dst, int width, uint8_t mask, const uint8_t *src)
 {
     int i;

     for (i = 0; i < 4; i++) {
         if (mask & (1 << 7 - i))
             dst[i] = src[i];
         if (mask & (1 << 3 - i))
             dst[width + i] = src[width + i];
     }
 }

 static void set_src_position(PAFVideoDecContext *c,
                              const uint8_t **p,
                              const uint8_t **pend)
 {
     int val  = bytestream2_get_be16(&c->gb);
     int page = val >> 14;
     int x    = (val & 0x7F);
     int y    = ((val >> 7) & 0x7F);

     *p    = c->frame[page] + x * 2 + y * 2 * c->width;
     *pend = c->frame[page] + c->frame_size;
 }

 static int decode_0(PAFVideoDecContext *c, uint8_t *pkt, uint8_t code)
 {
     uint32_t opcode_size, offset;
     uint8_t *dst, *dend, mask = 0, color = 0;
     const uint8_t *src, *send, *opcodes;
     int i, j, op = 0;

     i = bytestream2_get_byte(&c->gb);
     if (i) {
         if (code & 0x10) {
             int align;

             align = bytestream2_tell(&c->gb) & 3;
             if (align)
                 bytestream2_skip(&c->gb, 4 - align);
         }
         do {
             int page, val, x, y;
             val    = bytestream2_get_be16(&c->gb);
             page   = val >> 14;
             x      = (val & 0x7F) * 2;
             y      = ((val >> 7) & 0x7F) * 2;
             dst    = c->frame[page] + x + y * c->width;
             dend   = c->frame[page] + c->frame_size;
             offset = (x & 0x7F) * 2;
             j      = bytestream2_get_le16(&c->gb) + offset;
             do {
                 offset++;
                 if (dst + 3 * c->width + 4 > dend)
                     return AVERROR_INVALIDDATA;
                 read4x4block(c, dst, c->width);
                 if ((offset & 0x3F) == 0)
                     dst += c->width * 3;
                 dst += 4;
             } while (offset < j);
         } while (--i);
     }

     dst  = c->frame[c->current_frame];
     dend = c->frame[c->current_frame] + c->frame_size;
     do {
         set_src_position(c, &src, &send);
         if ((src + 3 * c->width + 4 > send) ||
             (dst + 3 * c->width + 4 > dend))
             return AVERROR_INVALIDDATA;
         copy_block4(dst, src, c->width, c->width, 4);
         i++;
         if ((i & 0x3F) == 0)
             dst += c->width * 3;
         dst += 4;
     } while (i < c->video_size / 16);

     opcode_size = bytestream2_get_le16(&c->gb);
     bytestream2_skip(&c->gb, 2);

     if (bytestream2_get_bytes_left(&c->gb) < opcode_size)
         return AVERROR_INVALIDDATA;

     opcodes = pkt + bytestream2_tell(&c->gb);
     bytestream2_skipu(&c->gb, opcode_size);

     dst = c->frame[c->current_frame];

     for (i = 0; i < c->height; i += 4, dst += c->width * 3)
         for (j = 0; j < c->width; j += 4, dst += 4) {
             int opcode, k = 0;
             if (op > opcode_size)
                 return AVERROR_INVALIDDATA;
             if (j & 4) {
                 opcode = opcodes[op] & 15;
                 op++;
             } else {
                 opcode = opcodes[op] >> 4;
             }

             while (block_sequences[opcode][k]) {
                 offset = c->width * 2;
                 code   = block_sequences[opcode][k++];

                 switch (code) {
                 case 2:
                     offset = 0;
                 case 3:
                     color = bytestream2_get_byte(&c->gb);
                 case 4:
                     mask = bytestream2_get_byte(&c->gb);
                     copy_color_mask(dst + offset, c->width, mask, color);
                     break;
                 case 5:
                     offset = 0;
                 case 6:
                     set_src_position(c, &src, &send);
                 case 7:
                     if (src + offset + c->width + 4 > send)
                         return AVERROR_INVALIDDATA;
                     mask = bytestream2_get_byte(&c->gb);
                     copy_src_mask(dst + offset, c->width, mask, src + offset);
                     break;
                 }
             }
         }

     return 0;
 }

 static int paf_video_decode(AVCodecContext *avctx, void *data,
                             int *got_frame, AVPacket *pkt)
 {
     PAFVideoDecContext *c = avctx->priv_data;
     uint8_t code, *dst, *end;
     int i, frame, ret;

     if ((ret = ff_reget_buffer(avctx, c->pic)) < 0)
         return ret;

     bytestream2_init(&c->gb, pkt->data, pkt->size);

     code = bytestream2_get_byte(&c->gb);
     if (code & 0x20) {  // frame is keyframe
         for (i = 0; i < 4; i++)
             memset(c->frame[i], 0, c->frame_size);

         memset(c->pic->data[1], 0, AVPALETTE_SIZE);
         c->current_frame  = 0;
         c->pic->key_frame = 1;
         c->pic->pict_type = AV_PICTURE_TYPE_I;
     } else {
         c->pic->key_frame = 0;
         c->pic->pict_type = AV_PICTURE_TYPE_P;
     }

     if (code & 0x40) {  // palette update
         uint32_t *out = (uint32_t *)c->pic->data[1];
         int index, count;

         index = bytestream2_get_byte(&c->gb);
         count = bytestream2_get_byte(&c->gb) + 1;

         if (index + count > 256)
             return AVERROR_INVALIDDATA;
         if (bytestream2_get_bytes_left(&c->gb) < 3 * count)
             return AVERROR_INVALIDDATA;

         out += index;
         for (i = 0; i < count; i++) {
             unsigned r, g, b;

             r = bytestream2_get_byteu(&c->gb);
             r = r << 2 | r >> 4;
             g = bytestream2_get_byteu(&c->gb);
             g = g << 2 | g >> 4;
             b = bytestream2_get_byteu(&c->gb);
             b = b << 2 | b >> 4;
             *out++ = (0xFFU << 24) | (r << 16) | (g << 8) | b;
         }
         c->pic->palette_has_changed = 1;
     }

     switch (code & 0x0F) {
     case 0:
         /* Block-based motion compensation using 4x4 blocks with either
          * horizontal or vertical vectors; might incorporate VQ as well. */
         if ((ret = decode_0(c, pkt->data, code)) < 0)
             return ret;
         break;
     case 1:
         /* Uncompressed data. This mode specifies that (width * height) bytes
          * should be copied directly from the encoded buffer into the output. */
         dst = c->frame[c->current_frame];
         // possibly chunk length data
         bytestream2_skip(&c->gb, 2);
         if (bytestream2_get_bytes_left(&c->gb) < c->video_size)
             return AVERROR_INVALIDDATA;
         bytestream2_get_bufferu(&c->gb, dst, c->video_size);
         break;
     case 2:
         /* Copy reference frame: Consume the next byte in the stream as the
          * reference frame (which should be 0, 1, 2, or 3, and should not be
          * the same as the current frame number). */
         frame = bytestream2_get_byte(&c->gb);
         if (frame > 3)
             return AVERROR_INVALIDDATA;
         if (frame != c->current_frame)
             memcpy(c->frame[c->current_frame], c->frame[frame], c->frame_size);
         break;
     case 4:
         /* Run length encoding.*/
         dst = c->frame[c->current_frame];
         end = dst + c->video_size;

         bytestream2_skip(&c->gb, 2);

         while (dst < end) {
             int8_t code;
             int count;

             if (bytestream2_get_bytes_left(&c->gb) < 2)
                 return AVERROR_INVALIDDATA;

             code  = bytestream2_get_byteu(&c->gb);
             count = FFABS(code) + 1;

             if (dst + count > end)
                 return AVERROR_INVALIDDATA;
             if (code < 0)
                 memset(dst, bytestream2_get_byteu(&c->gb), count);
             else
                 bytestream2_get_buffer(&c->gb, dst, count);
             dst += count;
         }
         break;
     default:
         avpriv_request_sample(avctx, "unknown/invalid code");
         return AVERROR_INVALIDDATA;
     }

     av_image_copy_plane(c->pic->data[0], c->pic->linesize[0],
                         c->frame[c->current_frame], c->width,
                         c->width, c->height);

     c->current_frame = (c->current_frame + 1) & 3;
     if ((ret = av_frame_ref(data, c->pic)) < 0)
         return ret;

     *got_frame = 1;

     return pkt->size;
 }

 AVCodec ff_paf_video_decoder = {
     .name           = "paf_video",
     .long_name      = NULL_IF_CONFIG_SMALL("Amazing Studio Packed Animation File Video"),
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = AV_CODEC_ID_PAF_VIDEO,
     .priv_data_size = sizeof(PAFVideoDecContext),
     .init           = paf_video_init,
     .close          = paf_video_close,
     .decode         = paf_video_decode,
     .capabilities   = AV_CODEC_CAP_DR1,
 };
	/*
	* Packed Animation File video decoder
	* Copyright (c) 2012 Paul B Mahol
	*
	* 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
	*/

	#include "libavutil/imgutils.h"

	#include "avcodec.h"
	#include "bytestream.h"
	#include "copy_block.h"
	#include "internal.h"


	static const uint8_t block_sequences[16][8] = {
	{ 0, 0, 0, 0, 0, 0, 0, 0 },
	{ 2, 0, 0, 0, 0, 0, 0, 0 },
	{ 5, 7, 0, 0, 0, 0, 0, 0 },
	{ 5, 0, 0, 0, 0, 0, 0, 0 },
	{ 6, 0, 0, 0, 0, 0, 0, 0 },
	{ 5, 7, 5, 7, 0, 0, 0, 0 },
	{ 5, 7, 5, 0, 0, 0, 0, 0 },
	{ 5, 7, 6, 0, 0, 0, 0, 0 },
	{ 5, 5, 0, 0, 0, 0, 0, 0 },
	{ 3, 0, 0, 0, 0, 0, 0, 0 },
	{ 6, 6, 0, 0, 0, 0, 0, 0 },
	{ 2, 4, 0, 0, 0, 0, 0, 0 },
	{ 2, 4, 5, 7, 0, 0, 0, 0 },
	{ 2, 4, 5, 0, 0, 0, 0, 0 },
	{ 2, 4, 6, 0, 0, 0, 0, 0 },
	{ 2, 4, 5, 7, 5, 7, 0, 0 },
	};

	typedef struct PAFVideoDecContext {
	AVFrame *pic;
	GetByteContext gb;

	int width;
	int height;

	int current_frame;
	uint8_t *frame[4];
	int frame_size;
	int video_size;

	uint8_t *opcodes;
	} PAFVideoDecContext;

	static av_cold int paf_video_close(AVCodecContext *avctx)
	{
	PAFVideoDecContext *c = avctx->priv_data;
	int i;

	av_frame_free(&c->pic);

	for (i = 0; i < 4; i++)
	av_freep(&c->frame[i]);

	return 0;
	}

	static av_cold int paf_video_init(AVCodecContext *avctx)
	{
	PAFVideoDecContext *c = avctx->priv_data;
	int i;

	c->width = avctx->width;
	c->height = avctx->height;

	if (avctx->height & 3 \|\| avctx->width & 3) {
	av_log(avctx, AV_LOG_ERROR,
	"width %d and height %d must be multiplie of 4.\n",
	avctx->width, avctx->height);
	return AVERROR_INVALIDDATA;
	}

	avctx->pix_fmt = AV_PIX_FMT_PAL8;

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

	c->frame_size = avctx->width * FFALIGN(avctx->height, 256);
	c->video_size = avctx->width * avctx->height;
	for (i = 0; i < 4; i++) {
	c->frame[i] = av_mallocz(c->frame_size);
	if (!c->frame[i]) {
	paf_video_close(avctx);
	return AVERROR(ENOMEM);
	}
	}

	return 0;
	}

	static void read4x4block(PAFVideoDecContext c, uint8_t dst, int width)
	{
	int i;

	for (i = 0; i < 4; i++) {
	bytestream2_get_buffer(&c->gb, dst, 4);
	dst += width;
	}
	}

	static void copy_color_mask(uint8_t *dst, int width, uint8_t mask, uint8_t color)
	{
	int i;

	for (i = 0; i < 4; i++) {
	if (mask & (1 << 7 - i))
	dst[i] = color;
	if (mask & (1 << 3 - i))
	dst[width + i] = color;
	}
	}

	static void copy_src_mask(uint8_t dst, int width, uint8_t mask, const uint8_t src)
	{
	int i;

	for (i = 0; i < 4; i++) {
	if (mask & (1 << 7 - i))
	dst[i] = src[i];
	if (mask & (1 << 3 - i))
	dst[width + i] = src[width + i];
	}
	}

	static void set_src_position(PAFVideoDecContext *c,
	const uint8_t **p,
	const uint8_t **pend)
	{
	int val = bytestream2_get_be16(&c->gb);
	int page = val >> 14;
	int x = (val & 0x7F);
	int y = ((val >> 7) & 0x7F);

	p = c->frame[page] + x 2 + y * 2 * c->width;
	*pend = c->frame[page] + c->frame_size;
	}

	static int decode_0(PAFVideoDecContext c, uint8_t pkt, uint8_t code)
	{
	uint32_t opcode_size, offset;
	uint8_t dst, dend, mask = 0, color = 0;
	const uint8_t src, send, *opcodes;
	int i, j, op = 0;

	i = bytestream2_get_byte(&c->gb);
	if (i) {
	if (code & 0x10) {
	int align;

	align = bytestream2_tell(&c->gb) & 3;
	if (align)
	bytestream2_skip(&c->gb, 4 - align);
	}
	do {
	int page, val, x, y;
	val = bytestream2_get_be16(&c->gb);
	page = val >> 14;
	x = (val & 0x7F) * 2;
	y = ((val >> 7) & 0x7F) * 2;
	dst = c->frame[page] + x + y * c->width;
	dend = c->frame[page] + c->frame_size;
	offset = (x & 0x7F) * 2;
	j = bytestream2_get_le16(&c->gb) + offset;
	do {
	offset++;
	if (dst + 3 * c->width + 4 > dend)
	return AVERROR_INVALIDDATA;
	read4x4block(c, dst, c->width);
	if ((offset & 0x3F) == 0)
	dst += c->width * 3;
	dst += 4;
	} while (offset < j);
	} while (--i);
	}

	dst = c->frame[c->current_frame];
	dend = c->frame[c->current_frame] + c->frame_size;
	do {
	set_src_position(c, &src, &send);
	if ((src + 3 * c->width + 4 > send) \|\|
	(dst + 3 * c->width + 4 > dend))
	return AVERROR_INVALIDDATA;
	copy_block4(dst, src, c->width, c->width, 4);
	i++;
	if ((i & 0x3F) == 0)
	dst += c->width * 3;
	dst += 4;
	} while (i < c->video_size / 16);

	opcode_size = bytestream2_get_le16(&c->gb);
	bytestream2_skip(&c->gb, 2);

	if (bytestream2_get_bytes_left(&c->gb) < opcode_size)
	return AVERROR_INVALIDDATA;

	opcodes = pkt + bytestream2_tell(&c->gb);
	bytestream2_skipu(&c->gb, opcode_size);

	dst = c->frame[c->current_frame];

	for (i = 0; i < c->height; i += 4, dst += c->width * 3)
	for (j = 0; j < c->width; j += 4, dst += 4) {
	int opcode, k = 0;
	if (op > opcode_size)
	return AVERROR_INVALIDDATA;
	if (j & 4) {
	opcode = opcodes[op] & 15;
	op++;
	} else {
	opcode = opcodes[op] >> 4;
	}

	while (block_sequences[opcode][k]) {
	offset = c->width * 2;
	code = block_sequences[opcode][k++];

	switch (code) {
	case 2:
	offset = 0;
	case 3:
	color = bytestream2_get_byte(&c->gb);
	case 4:
	mask = bytestream2_get_byte(&c->gb);
	copy_color_mask(dst + offset, c->width, mask, color);
	break;
	case 5:
	offset = 0;
	case 6:
	set_src_position(c, &src, &send);
	case 7:
	if (src + offset + c->width + 4 > send)
	return AVERROR_INVALIDDATA;
	mask = bytestream2_get_byte(&c->gb);
	copy_src_mask(dst + offset, c->width, mask, src + offset);
	break;
	}
	}
	}

	return 0;
	}

	static int paf_video_decode(AVCodecContext avctx, void data,
	int got_frame, AVPacket pkt)
	{
	PAFVideoDecContext *c = avctx->priv_data;
	uint8_t code, dst, end;
	int i, frame, ret;

	if ((ret = ff_reget_buffer(avctx, c->pic)) < 0)
	return ret;

	bytestream2_init(&c->gb, pkt->data, pkt->size);

	code = bytestream2_get_byte(&c->gb);
	if (code & 0x20) { // frame is keyframe
	for (i = 0; i < 4; i++)
	memset(c->frame[i], 0, c->frame_size);

	memset(c->pic->data[1], 0, AVPALETTE_SIZE);
	c->current_frame = 0;
	c->pic->key_frame = 1;
	c->pic->pict_type = AV_PICTURE_TYPE_I;
	} else {
	c->pic->key_frame = 0;
	c->pic->pict_type = AV_PICTURE_TYPE_P;
	}

	if (code & 0x40) { // palette update
	uint32_t out = (uint32_t )c->pic->data[1];
	int index, count;

	index = bytestream2_get_byte(&c->gb);
	count = bytestream2_get_byte(&c->gb) + 1;

	if (index + count > 256)
	return AVERROR_INVALIDDATA;
	if (bytestream2_get_bytes_left(&c->gb) < 3 * count)
	return AVERROR_INVALIDDATA;

	out += index;
	for (i = 0; i < count; i++) {
	unsigned r, g, b;

	r = bytestream2_get_byteu(&c->gb);
	r = r << 2 \| r >> 4;
	g = bytestream2_get_byteu(&c->gb);
	g = g << 2 \| g >> 4;
	b = bytestream2_get_byteu(&c->gb);
	b = b << 2 \| b >> 4;
	*out++ = (0xFFU << 24) \| (r << 16) \| (g << 8) \| b;
	}
	c->pic->palette_has_changed = 1;
	}

	switch (code & 0x0F) {
	case 0:
	/* Block-based motion compensation using 4x4 blocks with either
	* horizontal or vertical vectors; might incorporate VQ as well. */
	if ((ret = decode_0(c, pkt->data, code)) < 0)
	return ret;
	break;
	case 1:
	/* Uncompressed data. This mode specifies that (width * height) bytes
	* should be copied directly from the encoded buffer into the output. */
	dst = c->frame[c->current_frame];
	// possibly chunk length data
	bytestream2_skip(&c->gb, 2);
	if (bytestream2_get_bytes_left(&c->gb) < c->video_size)
	return AVERROR_INVALIDDATA;
	bytestream2_get_bufferu(&c->gb, dst, c->video_size);
	break;
	case 2:
	/* Copy reference frame: Consume the next byte in the stream as the
	* reference frame (which should be 0, 1, 2, or 3, and should not be
	* the same as the current frame number). */
	frame = bytestream2_get_byte(&c->gb);
	if (frame > 3)
	return AVERROR_INVALIDDATA;
	if (frame != c->current_frame)
	memcpy(c->frame[c->current_frame], c->frame[frame], c->frame_size);
	break;
	case 4:
	/* Run length encoding.*/
	dst = c->frame[c->current_frame];
	end = dst + c->video_size;

	bytestream2_skip(&c->gb, 2);

	while (dst < end) {
	int8_t code;
	int count;

	if (bytestream2_get_bytes_left(&c->gb) < 2)
	return AVERROR_INVALIDDATA;

	code = bytestream2_get_byteu(&c->gb);
	count = FFABS(code) + 1;

	if (dst + count > end)
	return AVERROR_INVALIDDATA;
	if (code < 0)
	memset(dst, bytestream2_get_byteu(&c->gb), count);
	else
	bytestream2_get_buffer(&c->gb, dst, count);
	dst += count;
	}
	break;
	default:
	avpriv_request_sample(avctx, "unknown/invalid code");
	return AVERROR_INVALIDDATA;
	}

	av_image_copy_plane(c->pic->data[0], c->pic->linesize[0],
	c->frame[c->current_frame], c->width,
	c->width, c->height);

	c->current_frame = (c->current_frame + 1) & 3;
	if ((ret = av_frame_ref(data, c->pic)) < 0)
	return ret;

	*got_frame = 1;

	return pkt->size;
	}

	AVCodec ff_paf_video_decoder = {
	.name = "paf_video",
	.long_name = NULL_IF_CONFIG_SMALL("Amazing Studio Packed Animation File Video"),
	.type = AVMEDIA_TYPE_VIDEO,
	.id = AV_CODEC_ID_PAF_VIDEO,
	.priv_data_size = sizeof(PAFVideoDecContext),
	.init = paf_video_init,
	.close = paf_video_close,
	.decode = paf_video_decode,
	.capabilities = AV_CODEC_CAP_DR1,
	};