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

 /*
  * Psygnosis YOP decoder
  *
  * Copyright (C) 2010 Mohamed Naufal Basheer <naufal11@gmail.com>
  * derived from the code by
  * Copyright (C) 2009 Thomas P. Higdon <thomas.p.higdon@gmail.com>
  *
  * 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/intreadwrite.h"
 #include "libavutil/imgutils.h"

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

 typedef struct YopDecContext {
     AVCodecContext *avctx;
     AVFrame *frame;

     int num_pal_colors;
     int first_color[2];
     int frame_data_length;

     uint8_t *low_nibble;
     uint8_t *srcptr;
     uint8_t *src_end;
     uint8_t *dstptr;
     uint8_t *dstbuf;
 } YopDecContext;

 // These tables are taken directly from:
 // http://wiki.multimedia.cx/index.php?title=Psygnosis_YOP

 /**
  * Lookup table for painting macroblocks. Bytes 0-2 of each entry contain
  * the macroblock positions to be painted (taken as (0, B0, B1, B2)).
  * Byte 3 contains the number of bytes consumed on the input,
  * equal to max(bytes 0-2) + 1.
  */
 static const uint8_t paint_lut[15][4] =
     {{1, 2, 3, 4}, {1, 2, 0, 3},
      {1, 2, 1, 3}, {1, 2, 2, 3},
      {1, 0, 2, 3}, {1, 0, 0, 2},
      {1, 0, 1, 2}, {1, 1, 2, 3},
      {0, 1, 2, 3}, {0, 1, 0, 2},
      {1, 1, 0, 2}, {0, 1, 1, 2},
      {0, 0, 1, 2}, {0, 0, 0, 1},
      {1, 1, 1, 2},
     };

 /**
  * Lookup table for copying macroblocks. Each entry contains the respective
  * x and y pixel offset for the copy source.
  */
 static const int8_t motion_vector[16][2] =
     {{-4, -4}, {-2, -4},
      { 0, -4}, { 2, -4},
      {-4, -2}, {-4,  0},
      {-3, -3}, {-1, -3},
      { 1, -3}, { 3, -3},
      {-3, -1}, {-2, -2},
      { 0, -2}, { 2, -2},
      { 4, -2}, {-2,  0},
     };

 static av_cold int yop_decode_close(AVCodecContext *avctx)
 {
     YopDecContext *s = avctx->priv_data;

     av_frame_free(&s->frame);

     return 0;
 }

 static av_cold int yop_decode_init(AVCodecContext *avctx)
 {
     YopDecContext *s = avctx->priv_data;
     s->avctx = avctx;

     if (avctx->width & 1 || avctx->height & 1 ||
         av_image_check_size(avctx->width, avctx->height, 0, avctx) < 0) {
         av_log(avctx, AV_LOG_ERROR, "YOP has invalid dimensions\n");
         return AVERROR_INVALIDDATA;
     }

     if (avctx->extradata_size < 3) {
         av_log(avctx, AV_LOG_ERROR, "Missing or incomplete extradata.\n");
         return AVERROR_INVALIDDATA;
     }

     avctx->pix_fmt = AV_PIX_FMT_PAL8;

     s->num_pal_colors = avctx->extradata[0];
     s->first_color[0] = avctx->extradata[1];
     s->first_color[1] = avctx->extradata[2];

     if (s->num_pal_colors + s->first_color[0] > 256 ||
         s->num_pal_colors + s->first_color[1] > 256) {
         av_log(avctx, AV_LOG_ERROR,
                "Palette parameters invalid, header probably corrupt\n");
         return AVERROR_INVALIDDATA;
     }

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

     return 0;
 }

 /**
  * Paint a macroblock using the pattern in paint_lut.
  * @param s codec context
  * @param tag the tag that was in the nibble
  */
 static int yop_paint_block(YopDecContext *s, int linesize, int tag)
 {
     if (s->src_end - s->srcptr < paint_lut[tag][3]) {
         av_log(s->avctx, AV_LOG_ERROR, "Packet too small.\n");
         return AVERROR_INVALIDDATA;
     }

     s->dstptr[0]            = s->srcptr[0];
     s->dstptr[1]            = s->srcptr[paint_lut[tag][0]];
     s->dstptr[linesize]     = s->srcptr[paint_lut[tag][1]];
     s->dstptr[linesize + 1] = s->srcptr[paint_lut[tag][2]];

     // The number of src bytes consumed is in the last part of the lut entry.
     s->srcptr += paint_lut[tag][3];
     return 0;
 }

 /**
  * Copy a previously painted macroblock to the current_block.
  * @param copy_tag the tag that was in the nibble
  */
 static int yop_copy_previous_block(YopDecContext *s, int linesize, int copy_tag)
 {
     uint8_t *bufptr;

     // Calculate position for the copy source
     bufptr = s->dstptr + motion_vector[copy_tag][0] +
              linesize * motion_vector[copy_tag][1];
     if (bufptr < s->dstbuf) {
         av_log(s->avctx, AV_LOG_ERROR, "File probably corrupt\n");
         return AVERROR_INVALIDDATA;
     }

     s->dstptr[0]            = bufptr[0];
     s->dstptr[1]            = bufptr[1];
     s->dstptr[linesize]     = bufptr[linesize];
     s->dstptr[linesize + 1] = bufptr[linesize + 1];

     return 0;
 }

 /**
  * Return the next nibble in sequence, consuming a new byte on the input
  * only if necessary.
  */
 static uint8_t yop_get_next_nibble(YopDecContext *s)
 {
     int ret;

     if (s->low_nibble) {
         ret           = *s->low_nibble & 0xf;
         s->low_nibble = NULL;
     }else {
         s->low_nibble = s->srcptr++;
         ret           = *s->low_nibble >> 4;
     }
     return ret;
 }

 static int yop_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
                             AVPacket *avpkt)
 {
     YopDecContext *s = avctx->priv_data;
     AVFrame *frame = s->frame;
     int tag, firstcolor, is_odd_frame;
     int ret, i, x, y;
     uint32_t *palette;

     if (avpkt->size < 4 + 3 * s->num_pal_colors) {
         av_log(avctx, AV_LOG_ERROR, "Packet too small.\n");
         return AVERROR_INVALIDDATA;
     }

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

     if (!avctx->frame_number)
         memset(frame->data[1], 0, AVPALETTE_SIZE);

     s->dstbuf     = frame->data[0];
     s->dstptr     = frame->data[0];
     s->srcptr     = avpkt->data + 4;
     s->src_end    = avpkt->data + avpkt->size;
     s->low_nibble = NULL;

     is_odd_frame = avpkt->data[0];
     if(is_odd_frame>1){
         av_log(avctx, AV_LOG_ERROR, "frame is too odd %d\n", is_odd_frame);
         return AVERROR_INVALIDDATA;
     }
     firstcolor   = s->first_color[is_odd_frame];
     palette      = (uint32_t *)frame->data[1];

     for (i = 0; i < s->num_pal_colors; i++, s->srcptr += 3) {
         palette[i + firstcolor] = (s->srcptr[0] << 18) |
                                   (s->srcptr[1] << 10) |
                                   (s->srcptr[2] << 2);
         palette[i + firstcolor] |= 0xFFU << 24 |
                                    (palette[i + firstcolor] >> 6) & 0x30303;
     }

     frame->palette_has_changed = 1;

     for (y = 0; y < avctx->height; y += 2) {
         for (x = 0; x < avctx->width; x += 2) {
             if (s->srcptr - avpkt->data >= avpkt->size) {
                 av_log(avctx, AV_LOG_ERROR, "Packet too small.\n");
                 return AVERROR_INVALIDDATA;
             }

             tag = yop_get_next_nibble(s);

             if (tag != 0xf) {
                 ret = yop_paint_block(s, frame->linesize[0], tag);
                 if (ret < 0)
                     return ret;
             } else {
                 tag = yop_get_next_nibble(s);
                 ret = yop_copy_previous_block(s, frame->linesize[0], tag);
                 if (ret < 0)
                     return ret;
             }
             s->dstptr += 2;
         }
         s->dstptr += 2*frame->linesize[0] - x;
     }

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

     *got_frame = 1;
     return avpkt->size;
 }

 AVCodec ff_yop_decoder = {
     .name           = "yop",
     .long_name      = NULL_IF_CONFIG_SMALL("Psygnosis YOP Video"),
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = AV_CODEC_ID_YOP,
     .priv_data_size = sizeof(YopDecContext),
     .init           = yop_decode_init,
     .close          = yop_decode_close,
     .decode         = yop_decode_frame,
 };
	/*
	* Psygnosis YOP decoder
	*
	* Copyright (C) 2010 Mohamed Naufal Basheer <naufal11@gmail.com>
	* derived from the code by
	* Copyright (C) 2009 Thomas P. Higdon <thomas.p.higdon@gmail.com>
	*
	* 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/intreadwrite.h"
	#include "libavutil/imgutils.h"

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

	typedef struct YopDecContext {
	AVCodecContext *avctx;
	AVFrame *frame;

	int num_pal_colors;
	int first_color[2];
	int frame_data_length;

	uint8_t *low_nibble;
	uint8_t *srcptr;
	uint8_t *src_end;
	uint8_t *dstptr;
	uint8_t *dstbuf;
	} YopDecContext;

	// These tables are taken directly from:
	// http://wiki.multimedia.cx/index.php?title=Psygnosis_YOP

	/**
	* Lookup table for painting macroblocks. Bytes 0-2 of each entry contain
	* the macroblock positions to be painted (taken as (0, B0, B1, B2)).
	* Byte 3 contains the number of bytes consumed on the input,
	* equal to max(bytes 0-2) + 1.
	*/
	static const uint8_t paint_lut[15][4] =
	{{1, 2, 3, 4}, {1, 2, 0, 3},
	{1, 2, 1, 3}, {1, 2, 2, 3},
	{1, 0, 2, 3}, {1, 0, 0, 2},
	{1, 0, 1, 2}, {1, 1, 2, 3},
	{0, 1, 2, 3}, {0, 1, 0, 2},
	{1, 1, 0, 2}, {0, 1, 1, 2},
	{0, 0, 1, 2}, {0, 0, 0, 1},
	{1, 1, 1, 2},
	};

	/**
	* Lookup table for copying macroblocks. Each entry contains the respective
	* x and y pixel offset for the copy source.
	*/
	static const int8_t motion_vector[16][2] =
	{{-4, -4}, {-2, -4},
	{ 0, -4}, { 2, -4},
	{-4, -2}, {-4, 0},
	{-3, -3}, {-1, -3},
	{ 1, -3}, { 3, -3},
	{-3, -1}, {-2, -2},
	{ 0, -2}, { 2, -2},
	{ 4, -2}, {-2, 0},
	};

	static av_cold int yop_decode_close(AVCodecContext *avctx)
	{
	YopDecContext *s = avctx->priv_data;

	av_frame_free(&s->frame);

	return 0;
	}

	static av_cold int yop_decode_init(AVCodecContext *avctx)
	{
	YopDecContext *s = avctx->priv_data;
	s->avctx = avctx;

	if (avctx->width & 1 \|\| avctx->height & 1 \|\|
	av_image_check_size(avctx->width, avctx->height, 0, avctx) < 0) {
	av_log(avctx, AV_LOG_ERROR, "YOP has invalid dimensions\n");
	return AVERROR_INVALIDDATA;
	}

	if (avctx->extradata_size < 3) {
	av_log(avctx, AV_LOG_ERROR, "Missing or incomplete extradata.\n");
	return AVERROR_INVALIDDATA;
	}

	avctx->pix_fmt = AV_PIX_FMT_PAL8;

	s->num_pal_colors = avctx->extradata[0];
	s->first_color[0] = avctx->extradata[1];
	s->first_color[1] = avctx->extradata[2];

	if (s->num_pal_colors + s->first_color[0] > 256 \|\|
	s->num_pal_colors + s->first_color[1] > 256) {
	av_log(avctx, AV_LOG_ERROR,
	"Palette parameters invalid, header probably corrupt\n");
	return AVERROR_INVALIDDATA;
	}

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

	return 0;
	}

	/**
	* Paint a macroblock using the pattern in paint_lut.
	* @param s codec context
	* @param tag the tag that was in the nibble
	*/
	static int yop_paint_block(YopDecContext *s, int linesize, int tag)
	{
	if (s->src_end - s->srcptr < paint_lut[tag][3]) {
	av_log(s->avctx, AV_LOG_ERROR, "Packet too small.\n");
	return AVERROR_INVALIDDATA;
	}

	s->dstptr[0] = s->srcptr[0];
	s->dstptr[1] = s->srcptr[paint_lut[tag][0]];
	s->dstptr[linesize] = s->srcptr[paint_lut[tag][1]];
	s->dstptr[linesize + 1] = s->srcptr[paint_lut[tag][2]];

	// The number of src bytes consumed is in the last part of the lut entry.
	s->srcptr += paint_lut[tag][3];
	return 0;
	}

	/**
	* Copy a previously painted macroblock to the current_block.
	* @param copy_tag the tag that was in the nibble
	*/
	static int yop_copy_previous_block(YopDecContext *s, int linesize, int copy_tag)
	{
	uint8_t *bufptr;

	// Calculate position for the copy source
	bufptr = s->dstptr + motion_vector[copy_tag][0] +
	linesize * motion_vector[copy_tag][1];
	if (bufptr < s->dstbuf) {
	av_log(s->avctx, AV_LOG_ERROR, "File probably corrupt\n");
	return AVERROR_INVALIDDATA;
	}

	s->dstptr[0] = bufptr[0];
	s->dstptr[1] = bufptr[1];
	s->dstptr[linesize] = bufptr[linesize];
	s->dstptr[linesize + 1] = bufptr[linesize + 1];

	return 0;
	}

	/**
	* Return the next nibble in sequence, consuming a new byte on the input
	* only if necessary.
	*/
	static uint8_t yop_get_next_nibble(YopDecContext *s)
	{
	int ret;

	if (s->low_nibble) {
	ret = *s->low_nibble & 0xf;
	s->low_nibble = NULL;
	}else {
	s->low_nibble = s->srcptr++;
	ret = *s->low_nibble >> 4;
	}
	return ret;
	}

	static int yop_decode_frame(AVCodecContext avctx, void data, int *got_frame,
	AVPacket *avpkt)
	{
	YopDecContext *s = avctx->priv_data;
	AVFrame *frame = s->frame;
	int tag, firstcolor, is_odd_frame;
	int ret, i, x, y;
	uint32_t *palette;

	if (avpkt->size < 4 + 3 * s->num_pal_colors) {
	av_log(avctx, AV_LOG_ERROR, "Packet too small.\n");
	return AVERROR_INVALIDDATA;
	}

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

	if (!avctx->frame_number)
	memset(frame->data[1], 0, AVPALETTE_SIZE);

	s->dstbuf = frame->data[0];
	s->dstptr = frame->data[0];
	s->srcptr = avpkt->data + 4;
	s->src_end = avpkt->data + avpkt->size;
	s->low_nibble = NULL;

	is_odd_frame = avpkt->data[0];
	if(is_odd_frame>1){
	av_log(avctx, AV_LOG_ERROR, "frame is too odd %d\n", is_odd_frame);
	return AVERROR_INVALIDDATA;
	}
	firstcolor = s->first_color[is_odd_frame];
	palette = (uint32_t *)frame->data[1];

	for (i = 0; i < s->num_pal_colors; i++, s->srcptr += 3) {
	palette[i + firstcolor] = (s->srcptr[0] << 18) \|
	(s->srcptr[1] << 10) \|
	(s->srcptr[2] << 2);
	palette[i + firstcolor] \|= 0xFFU << 24 \|
	(palette[i + firstcolor] >> 6) & 0x30303;
	}

	frame->palette_has_changed = 1;

	for (y = 0; y < avctx->height; y += 2) {
	for (x = 0; x < avctx->width; x += 2) {
	if (s->srcptr - avpkt->data >= avpkt->size) {
	av_log(avctx, AV_LOG_ERROR, "Packet too small.\n");
	return AVERROR_INVALIDDATA;
	}

	tag = yop_get_next_nibble(s);

	if (tag != 0xf) {
	ret = yop_paint_block(s, frame->linesize[0], tag);
	if (ret < 0)
	return ret;
	} else {
	tag = yop_get_next_nibble(s);
	ret = yop_copy_previous_block(s, frame->linesize[0], tag);
	if (ret < 0)
	return ret;
	}
	s->dstptr += 2;
	}
	s->dstptr += 2*frame->linesize[0] - x;
	}

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

	*got_frame = 1;
	return avpkt->size;
	}

	AVCodec ff_yop_decoder = {
	.name = "yop",
	.long_name = NULL_IF_CONFIG_SMALL("Psygnosis YOP Video"),
	.type = AVMEDIA_TYPE_VIDEO,
	.id = AV_CODEC_ID_YOP,
	.priv_data_size = sizeof(YopDecContext),
	.init = yop_decode_init,
	.close = yop_decode_close,
	.decode = yop_decode_frame,
	};