libavcodec/cdxl.c - manifest_repos/ffmpeg - Git at Google

 /*
  * CDXL video decoder
  * Copyright (c) 2011-2012 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
  */

 /**
  * @file
  * Commodore CDXL video decoder
  * @author Paul B Mahol
  */

 #include "libavutil/intreadwrite.h"
 #include "libavutil/imgutils.h"
 #include "avcodec.h"
 #include "bytestream.h"
 #include "get_bits.h"
 #include "internal.h"

 #define BIT_PLANAR   0x00
 #define CHUNKY       0x20
 #define BYTE_PLANAR  0x40
 #define BIT_LINE     0x80
 #define BYTE_LINE    0xC0

 typedef struct CDXLVideoContext {
     AVCodecContext *avctx;
     int            bpp;
     int            format;
     int            padded_bits;
     const uint8_t  *palette;
     int            palette_size;
     const uint8_t  *video;
     int            video_size;
     uint8_t        *new_video;
     int            new_video_size;
 } CDXLVideoContext;

 static av_cold int cdxl_decode_init(AVCodecContext *avctx)
 {
     CDXLVideoContext *c = avctx->priv_data;

     c->new_video_size = 0;
     c->avctx          = avctx;

     return 0;
 }

 static void import_palette(CDXLVideoContext *c, uint32_t *new_palette)
 {
     int i;

     for (i = 0; i < c->palette_size / 2; i++) {
         unsigned rgb = AV_RB16(&c->palette[i * 2]);
         unsigned r   = ((rgb >> 8) & 0xF) * 0x11;
         unsigned g   = ((rgb >> 4) & 0xF) * 0x11;
         unsigned b   =  (rgb       & 0xF) * 0x11;
         AV_WN32(&new_palette[i], (0xFFU << 24) | (r << 16) | (g << 8) | b);
     }
 }

 static void bitplanar2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
 {
     GetBitContext gb;
     int x, y, plane;

     if (init_get_bits8(&gb, c->video, c->video_size) < 0)
         return;
     for (plane = 0; plane < c->bpp; plane++) {
         for (y = 0; y < c->avctx->height; y++) {
             for (x = 0; x < c->avctx->width; x++)
                 out[linesize * y + x] |= get_bits1(&gb) << plane;
             skip_bits(&gb, c->padded_bits);
         }
     }
 }

 static void bitline2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
 {
     GetBitContext  gb;
     int x, y, plane;

     if (init_get_bits8(&gb, c->video, c->video_size) < 0)
         return;
     for (y = 0; y < c->avctx->height; y++) {
         for (plane = 0; plane < c->bpp; plane++) {
             for (x = 0; x < c->avctx->width; x++)
                 out[linesize * y + x] |= get_bits1(&gb) << plane;
             skip_bits(&gb, c->padded_bits);
         }
     }
 }

 static void chunky2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
 {
     GetByteContext gb;
     int y;

     bytestream2_init(&gb, c->video, c->video_size);
     for (y = 0; y < c->avctx->height; y++) {
         bytestream2_get_buffer(&gb, out + linesize * y, c->avctx->width * 3);
     }
 }

 static void import_format(CDXLVideoContext *c, int linesize, uint8_t *out)
 {
     memset(out, 0, linesize * c->avctx->height);

     switch (c->format) {
     case BIT_PLANAR:
         bitplanar2chunky(c, linesize, out);
         break;
     case BIT_LINE:
         bitline2chunky(c, linesize, out);
         break;
     case CHUNKY:
         chunky2chunky(c, linesize, out);
         break;
     }
 }

 static void cdxl_decode_rgb(CDXLVideoContext *c, AVFrame *frame)
 {
     uint32_t *new_palette = (uint32_t *)frame->data[1];

     memset(frame->data[1], 0, AVPALETTE_SIZE);
     import_palette(c, new_palette);
     import_format(c, frame->linesize[0], frame->data[0]);
 }

 static void cdxl_decode_raw(CDXLVideoContext *c, AVFrame *frame)
 {
     import_format(c, frame->linesize[0], frame->data[0]);
 }

 static void cdxl_decode_ham6(CDXLVideoContext *c, AVFrame *frame)
 {
     AVCodecContext *avctx = c->avctx;
     uint32_t new_palette[16], r, g, b;
     uint8_t *ptr, *out, index, op;
     int x, y;

     ptr = c->new_video;
     out = frame->data[0];

     import_palette(c, new_palette);
     import_format(c, avctx->width, c->new_video);

     for (y = 0; y < avctx->height; y++) {
         r = new_palette[0] & 0xFF0000;
         g = new_palette[0] & 0xFF00;
         b = new_palette[0] & 0xFF;
         for (x = 0; x < avctx->width; x++) {
             index  = *ptr++;
             op     = index >> 4;
             index &= 15;
             switch (op) {
             case 0:
                 r = new_palette[index] & 0xFF0000;
                 g = new_palette[index] & 0xFF00;
                 b = new_palette[index] & 0xFF;
                 break;
             case 1:
                 b = index * 0x11;
                 break;
             case 2:
                 r = index * 0x11 << 16;
                 break;
             case 3:
                 g = index * 0x11 << 8;
                 break;
             }
             AV_WL24(out + x * 3, r | g | b);
         }
         out += frame->linesize[0];
     }
 }

 static void cdxl_decode_ham8(CDXLVideoContext *c, AVFrame *frame)
 {
     AVCodecContext *avctx = c->avctx;
     uint32_t new_palette[64], r, g, b;
     uint8_t *ptr, *out, index, op;
     int x, y;

     ptr = c->new_video;
     out = frame->data[0];

     import_palette(c, new_palette);
     import_format(c, avctx->width, c->new_video);

     for (y = 0; y < avctx->height; y++) {
         r = new_palette[0] & 0xFF0000;
         g = new_palette[0] & 0xFF00;
         b = new_palette[0] & 0xFF;
         for (x = 0; x < avctx->width; x++) {
             index  = *ptr++;
             op     = index >> 6;
             index &= 63;
             switch (op) {
             case 0:
                 r = new_palette[index] & 0xFF0000;
                 g = new_palette[index] & 0xFF00;
                 b = new_palette[index] & 0xFF;
                 break;
             case 1:
                 b = (index <<  2) | (b & 3);
                 break;
             case 2:
                 r = (index << 18) | (r & (3 << 16));
                 break;
             case 3:
                 g = (index << 10) | (g & (3 << 8));
                 break;
             }
             AV_WL24(out + x * 3, r | g | b);
         }
         out += frame->linesize[0];
     }
 }

 static int cdxl_decode_frame(AVCodecContext *avctx, void *data,
                              int *got_frame, AVPacket *pkt)
 {
     CDXLVideoContext *c = avctx->priv_data;
     AVFrame * const p = data;
     int ret, w, h, encoding, aligned_width, buf_size = pkt->size;
     const uint8_t *buf = pkt->data;

     if (buf_size < 32)
         return AVERROR_INVALIDDATA;
     encoding        = buf[1] & 7;
     c->format       = buf[1] & 0xE0;
     w               = AV_RB16(&buf[14]);
     h               = AV_RB16(&buf[16]);
     c->bpp          = buf[19];
     c->palette_size = AV_RB16(&buf[20]);
     c->palette      = buf + 32;
     c->video        = c->palette + c->palette_size;
     c->video_size   = buf_size - c->palette_size - 32;

     if (c->palette_size > 512)
         return AVERROR_INVALIDDATA;
     if (buf_size < c->palette_size + 32)
         return AVERROR_INVALIDDATA;
     if (c->bpp < 1)
         return AVERROR_INVALIDDATA;
     if (c->format != BIT_PLANAR && c->format != BIT_LINE && c->format != CHUNKY) {
         avpriv_request_sample(avctx, "Pixel format 0x%0x", c->format);
         return AVERROR_PATCHWELCOME;
     }

     if ((ret = ff_set_dimensions(avctx, w, h)) < 0)
         return ret;

     if (c->format == CHUNKY)
         aligned_width = avctx->width;
     else
         aligned_width = FFALIGN(c->avctx->width, 16);
     c->padded_bits  = aligned_width - c->avctx->width;
     if (c->video_size < aligned_width * avctx->height * (int64_t)c->bpp / 8)
         return AVERROR_INVALIDDATA;
     if (!encoding && c->palette_size && c->bpp <= 8 && c->format != CHUNKY) {
         avctx->pix_fmt = AV_PIX_FMT_PAL8;
     } else if (encoding == 1 && (c->bpp == 6 || c->bpp == 8) && c->format != CHUNKY) {
         if (c->palette_size != (1 << (c->bpp - 1)))
             return AVERROR_INVALIDDATA;
         avctx->pix_fmt = AV_PIX_FMT_BGR24;
     } else if (!encoding && c->bpp == 24 && c->format == CHUNKY &&
                !c->palette_size) {
         avctx->pix_fmt = AV_PIX_FMT_RGB24;
     } else {
         avpriv_request_sample(avctx, "Encoding %d, bpp %d and format 0x%x",
                               encoding, c->bpp, c->format);
         return AVERROR_PATCHWELCOME;
     }

     if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
         return ret;
     p->pict_type = AV_PICTURE_TYPE_I;
     p->key_frame = 1;

     if (encoding) {
         av_fast_padded_malloc(&c->new_video, &c->new_video_size,
                               h * w + AV_INPUT_BUFFER_PADDING_SIZE);
         if (!c->new_video)
             return AVERROR(ENOMEM);
         if (c->bpp == 8)
             cdxl_decode_ham8(c, p);
         else
             cdxl_decode_ham6(c, p);
     } else if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
         cdxl_decode_rgb(c, p);
     } else {
         cdxl_decode_raw(c, p);
     }
     *got_frame = 1;

     return buf_size;
 }

 static av_cold int cdxl_decode_end(AVCodecContext *avctx)
 {
     CDXLVideoContext *c = avctx->priv_data;

     av_freep(&c->new_video);

     return 0;
 }

 AVCodec ff_cdxl_decoder = {
     .name           = "cdxl",
     .long_name      = NULL_IF_CONFIG_SMALL("Commodore CDXL video"),
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = AV_CODEC_ID_CDXL,
     .priv_data_size = sizeof(CDXLVideoContext),
     .init           = cdxl_decode_init,
     .close          = cdxl_decode_end,
     .decode         = cdxl_decode_frame,
     .capabilities   = AV_CODEC_CAP_DR1,
     .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
 };
	/*
	* CDXL video decoder
	* Copyright (c) 2011-2012 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
	*/

	/**
	* @file
	* Commodore CDXL video decoder
	* @author Paul B Mahol
	*/

	#include "libavutil/intreadwrite.h"
	#include "libavutil/imgutils.h"
	#include "avcodec.h"
	#include "bytestream.h"
	#include "get_bits.h"
	#include "internal.h"

	#define BIT_PLANAR 0x00
	#define CHUNKY 0x20
	#define BYTE_PLANAR 0x40
	#define BIT_LINE 0x80
	#define BYTE_LINE 0xC0

	typedef struct CDXLVideoContext {
	AVCodecContext *avctx;
	int bpp;
	int format;
	int padded_bits;
	const uint8_t *palette;
	int palette_size;
	const uint8_t *video;
	int video_size;
	uint8_t *new_video;
	int new_video_size;
	} CDXLVideoContext;

	static av_cold int cdxl_decode_init(AVCodecContext *avctx)
	{
	CDXLVideoContext *c = avctx->priv_data;

	c->new_video_size = 0;
	c->avctx = avctx;

	return 0;
	}

	static void import_palette(CDXLVideoContext c, uint32_t new_palette)
	{
	int i;

	for (i = 0; i < c->palette_size / 2; i++) {
	unsigned rgb = AV_RB16(&c->palette[i * 2]);
	unsigned r = ((rgb >> 8) & 0xF) * 0x11;
	unsigned g = ((rgb >> 4) & 0xF) * 0x11;
	unsigned b = (rgb & 0xF) * 0x11;
	AV_WN32(&new_palette[i], (0xFFU << 24) \| (r << 16) \| (g << 8) \| b);
	}
	}

	static void bitplanar2chunky(CDXLVideoContext c, int linesize, uint8_t out)
	{
	GetBitContext gb;
	int x, y, plane;

	if (init_get_bits8(&gb, c->video, c->video_size) < 0)
	return;
	for (plane = 0; plane < c->bpp; plane++) {
	for (y = 0; y < c->avctx->height; y++) {
	for (x = 0; x < c->avctx->width; x++)
	out[linesize * y + x] \|= get_bits1(&gb) << plane;
	skip_bits(&gb, c->padded_bits);
	}
	}
	}

	static void bitline2chunky(CDXLVideoContext c, int linesize, uint8_t out)
	{
	GetBitContext gb;
	int x, y, plane;

	if (init_get_bits8(&gb, c->video, c->video_size) < 0)
	return;
	for (y = 0; y < c->avctx->height; y++) {
	for (plane = 0; plane < c->bpp; plane++) {
	for (x = 0; x < c->avctx->width; x++)
	out[linesize * y + x] \|= get_bits1(&gb) << plane;
	skip_bits(&gb, c->padded_bits);
	}
	}
	}

	static void chunky2chunky(CDXLVideoContext c, int linesize, uint8_t out)
	{
	GetByteContext gb;
	int y;

	bytestream2_init(&gb, c->video, c->video_size);
	for (y = 0; y < c->avctx->height; y++) {
	bytestream2_get_buffer(&gb, out + linesize * y, c->avctx->width * 3);
	}
	}

	static void import_format(CDXLVideoContext c, int linesize, uint8_t out)
	{
	memset(out, 0, linesize * c->avctx->height);

	switch (c->format) {
	case BIT_PLANAR:
	bitplanar2chunky(c, linesize, out);
	break;
	case BIT_LINE:
	bitline2chunky(c, linesize, out);
	break;
	case CHUNKY:
	chunky2chunky(c, linesize, out);
	break;
	}
	}

	static void cdxl_decode_rgb(CDXLVideoContext c, AVFrame frame)
	{
	uint32_t new_palette = (uint32_t )frame->data[1];

	memset(frame->data[1], 0, AVPALETTE_SIZE);
	import_palette(c, new_palette);
	import_format(c, frame->linesize[0], frame->data[0]);
	}

	static void cdxl_decode_raw(CDXLVideoContext c, AVFrame frame)
	{
	import_format(c, frame->linesize[0], frame->data[0]);
	}

	static void cdxl_decode_ham6(CDXLVideoContext c, AVFrame frame)
	{
	AVCodecContext *avctx = c->avctx;
	uint32_t new_palette[16], r, g, b;
	uint8_t ptr, out, index, op;
	int x, y;

	ptr = c->new_video;
	out = frame->data[0];

	import_palette(c, new_palette);
	import_format(c, avctx->width, c->new_video);

	for (y = 0; y < avctx->height; y++) {
	r = new_palette[0] & 0xFF0000;
	g = new_palette[0] & 0xFF00;
	b = new_palette[0] & 0xFF;
	for (x = 0; x < avctx->width; x++) {
	index = *ptr++;
	op = index >> 4;
	index &= 15;
	switch (op) {
	case 0:
	r = new_palette[index] & 0xFF0000;
	g = new_palette[index] & 0xFF00;
	b = new_palette[index] & 0xFF;
	break;
	case 1:
	b = index * 0x11;
	break;
	case 2:
	r = index * 0x11 << 16;
	break;
	case 3:
	g = index * 0x11 << 8;
	break;
	}
	AV_WL24(out + x * 3, r \| g \| b);
	}
	out += frame->linesize[0];
	}
	}

	static void cdxl_decode_ham8(CDXLVideoContext c, AVFrame frame)
	{
	AVCodecContext *avctx = c->avctx;
	uint32_t new_palette[64], r, g, b;
	uint8_t ptr, out, index, op;
	int x, y;

	ptr = c->new_video;
	out = frame->data[0];

	import_palette(c, new_palette);
	import_format(c, avctx->width, c->new_video);

	for (y = 0; y < avctx->height; y++) {
	r = new_palette[0] & 0xFF0000;
	g = new_palette[0] & 0xFF00;
	b = new_palette[0] & 0xFF;
	for (x = 0; x < avctx->width; x++) {
	index = *ptr++;
	op = index >> 6;
	index &= 63;
	switch (op) {
	case 0:
	r = new_palette[index] & 0xFF0000;
	g = new_palette[index] & 0xFF00;
	b = new_palette[index] & 0xFF;
	break;
	case 1:
	b = (index << 2) \| (b & 3);
	break;
	case 2:
	r = (index << 18) \| (r & (3 << 16));
	break;
	case 3:
	g = (index << 10) \| (g & (3 << 8));
	break;
	}
	AV_WL24(out + x * 3, r \| g \| b);
	}
	out += frame->linesize[0];
	}
	}

	static int cdxl_decode_frame(AVCodecContext avctx, void data,
	int got_frame, AVPacket pkt)
	{
	CDXLVideoContext *c = avctx->priv_data;
	AVFrame * const p = data;
	int ret, w, h, encoding, aligned_width, buf_size = pkt->size;
	const uint8_t *buf = pkt->data;

	if (buf_size < 32)
	return AVERROR_INVALIDDATA;
	encoding = buf[1] & 7;
	c->format = buf[1] & 0xE0;
	w = AV_RB16(&buf[14]);
	h = AV_RB16(&buf[16]);
	c->bpp = buf[19];
	c->palette_size = AV_RB16(&buf[20]);
	c->palette = buf + 32;
	c->video = c->palette + c->palette_size;
	c->video_size = buf_size - c->palette_size - 32;

	if (c->palette_size > 512)
	return AVERROR_INVALIDDATA;
	if (buf_size < c->palette_size + 32)
	return AVERROR_INVALIDDATA;
	if (c->bpp < 1)
	return AVERROR_INVALIDDATA;
	if (c->format != BIT_PLANAR && c->format != BIT_LINE && c->format != CHUNKY) {
	avpriv_request_sample(avctx, "Pixel format 0x%0x", c->format);
	return AVERROR_PATCHWELCOME;
	}

	if ((ret = ff_set_dimensions(avctx, w, h)) < 0)
	return ret;

	if (c->format == CHUNKY)
	aligned_width = avctx->width;
	else
	aligned_width = FFALIGN(c->avctx->width, 16);
	c->padded_bits = aligned_width - c->avctx->width;
	if (c->video_size < aligned_width * avctx->height * (int64_t)c->bpp / 8)
	return AVERROR_INVALIDDATA;
	if (!encoding && c->palette_size && c->bpp <= 8 && c->format != CHUNKY) {
	avctx->pix_fmt = AV_PIX_FMT_PAL8;
	} else if (encoding == 1 && (c->bpp == 6 \|\| c->bpp == 8) && c->format != CHUNKY) {
	if (c->palette_size != (1 << (c->bpp - 1)))
	return AVERROR_INVALIDDATA;
	avctx->pix_fmt = AV_PIX_FMT_BGR24;
	} else if (!encoding && c->bpp == 24 && c->format == CHUNKY &&
	!c->palette_size) {
	avctx->pix_fmt = AV_PIX_FMT_RGB24;
	} else {
	avpriv_request_sample(avctx, "Encoding %d, bpp %d and format 0x%x",
	encoding, c->bpp, c->format);
	return AVERROR_PATCHWELCOME;
	}

	if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
	return ret;
	p->pict_type = AV_PICTURE_TYPE_I;
	p->key_frame = 1;

	if (encoding) {
	av_fast_padded_malloc(&c->new_video, &c->new_video_size,
	h * w + AV_INPUT_BUFFER_PADDING_SIZE);
	if (!c->new_video)
	return AVERROR(ENOMEM);
	if (c->bpp == 8)
	cdxl_decode_ham8(c, p);
	else
	cdxl_decode_ham6(c, p);
	} else if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
	cdxl_decode_rgb(c, p);
	} else {
	cdxl_decode_raw(c, p);
	}
	*got_frame = 1;

	return buf_size;
	}

	static av_cold int cdxl_decode_end(AVCodecContext *avctx)
	{
	CDXLVideoContext *c = avctx->priv_data;

	av_freep(&c->new_video);

	return 0;
	}

	AVCodec ff_cdxl_decoder = {
	.name = "cdxl",
	.long_name = NULL_IF_CONFIG_SMALL("Commodore CDXL video"),
	.type = AVMEDIA_TYPE_VIDEO,
	.id = AV_CODEC_ID_CDXL,
	.priv_data_size = sizeof(CDXLVideoContext),
	.init = cdxl_decode_init,
	.close = cdxl_decode_end,
	.decode = cdxl_decode_frame,
	.capabilities = AV_CODEC_CAP_DR1,
	.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
	};