yading@10: /*
yading@10:  * CDXL video decoder
yading@10:  * Copyright (c) 2011-2012 Paul B Mahol
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: #define UNCHECKED_BITSTREAM_READER 1
yading@10: 
yading@10: #include "libavutil/intreadwrite.h"
yading@10: #include "libavutil/imgutils.h"
yading@10: #include "avcodec.h"
yading@10: #include "get_bits.h"
yading@10: #include "internal.h"
yading@10: 
yading@10: #define BIT_PLANAR   0x00
yading@10: #define CHUNKY       0x20
yading@10: #define BYTE_PLANAR  0x40
yading@10: #define BIT_LINE     0x80
yading@10: #define BYTE_LINE    0xC0
yading@10: 
yading@10: typedef struct {
yading@10:     AVCodecContext *avctx;
yading@10:     int            bpp;
yading@10:     int            format;
yading@10:     int            padded_bits;
yading@10:     const uint8_t  *palette;
yading@10:     int            palette_size;
yading@10:     const uint8_t  *video;
yading@10:     int            video_size;
yading@10:     uint8_t        *new_video;
yading@10:     int            new_video_size;
yading@10: } CDXLVideoContext;
yading@10: 
yading@10: static av_cold int cdxl_decode_init(AVCodecContext *avctx)
yading@10: {
yading@10:     CDXLVideoContext *c = avctx->priv_data;
yading@10: 
yading@10:     c->new_video_size = 0;
yading@10:     c->avctx          = avctx;
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static void import_palette(CDXLVideoContext *c, uint32_t *new_palette)
yading@10: {
yading@10:     int i;
yading@10: 
yading@10:     for (i = 0; i < c->palette_size / 2; i++) {
yading@10:         unsigned rgb = AV_RB16(&c->palette[i * 2]);
yading@10:         unsigned r   = ((rgb >> 8) & 0xF) * 0x11;
yading@10:         unsigned g   = ((rgb >> 4) & 0xF) * 0x11;
yading@10:         unsigned b   =  (rgb       & 0xF) * 0x11;
yading@10:         AV_WN32(&new_palette[i], (0xFFU << 24) | (r << 16) | (g << 8) | b);
yading@10:     }
yading@10: }
yading@10: 
yading@10: static void bitplanar2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
yading@10: {
yading@10:     GetBitContext gb;
yading@10:     int x, y, plane;
yading@10: 
yading@10:     init_get_bits(&gb, c->video, c->video_size * 8);
yading@10:     for (plane = 0; plane < c->bpp; plane++) {
yading@10:         for (y = 0; y < c->avctx->height; y++) {
yading@10:             for (x = 0; x < c->avctx->width; x++)
yading@10:                 out[linesize * y + x] |= get_bits1(&gb) << plane;
yading@10:             skip_bits(&gb, c->padded_bits);
yading@10:         }
yading@10:     }
yading@10: }
yading@10: 
yading@10: static void bitline2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
yading@10: {
yading@10:     GetBitContext  gb;
yading@10:     int x, y, plane;
yading@10: 
yading@10:     init_get_bits(&gb, c->video, c->video_size * 8);
yading@10:     for (y = 0; y < c->avctx->height; y++) {
yading@10:         for (plane = 0; plane < c->bpp; plane++) {
yading@10:             for (x = 0; x < c->avctx->width; x++)
yading@10:                 out[linesize * y + x] |= get_bits1(&gb) << plane;
yading@10:             skip_bits(&gb, c->padded_bits);
yading@10:         }
yading@10:     }
yading@10: }
yading@10: 
yading@10: static void import_format(CDXLVideoContext *c, int linesize, uint8_t *out)
yading@10: {
yading@10:     memset(out, 0, linesize * c->avctx->height);
yading@10: 
yading@10:     switch (c->format) {
yading@10:     case BIT_PLANAR:
yading@10:         bitplanar2chunky(c, linesize, out);
yading@10:         break;
yading@10:     case BIT_LINE:
yading@10:         bitline2chunky(c, linesize, out);
yading@10:         break;
yading@10:     }
yading@10: }
yading@10: 
yading@10: static void cdxl_decode_rgb(CDXLVideoContext *c, AVFrame *frame)
yading@10: {
yading@10:     uint32_t *new_palette = (uint32_t *)frame->data[1];
yading@10: 
yading@10:     memset(frame->data[1], 0, AVPALETTE_SIZE);
yading@10:     import_palette(c, new_palette);
yading@10:     import_format(c, frame->linesize[0], frame->data[0]);
yading@10: }
yading@10: 
yading@10: static void cdxl_decode_ham6(CDXLVideoContext *c, AVFrame *frame)
yading@10: {
yading@10:     AVCodecContext *avctx = c->avctx;
yading@10:     uint32_t new_palette[16], r, g, b;
yading@10:     uint8_t *ptr, *out, index, op;
yading@10:     int x, y;
yading@10: 
yading@10:     ptr = c->new_video;
yading@10:     out = frame->data[0];
yading@10: 
yading@10:     import_palette(c, new_palette);
yading@10:     import_format(c, avctx->width, c->new_video);
yading@10: 
yading@10:     for (y = 0; y < avctx->height; y++) {
yading@10:         r = new_palette[0] & 0xFF0000;
yading@10:         g = new_palette[0] & 0xFF00;
yading@10:         b = new_palette[0] & 0xFF;
yading@10:         for (x = 0; x < avctx->width; x++) {
yading@10:             index  = *ptr++;
yading@10:             op     = index >> 4;
yading@10:             index &= 15;
yading@10:             switch (op) {
yading@10:             case 0:
yading@10:                 r = new_palette[index] & 0xFF0000;
yading@10:                 g = new_palette[index] & 0xFF00;
yading@10:                 b = new_palette[index] & 0xFF;
yading@10:                 break;
yading@10:             case 1:
yading@10:                 b = index * 0x11;
yading@10:                 break;
yading@10:             case 2:
yading@10:                 r = index * 0x11 << 16;
yading@10:                 break;
yading@10:             case 3:
yading@10:                 g = index * 0x11 << 8;
yading@10:                 break;
yading@10:             }
yading@10:             AV_WL24(out + x * 3, r | g | b);
yading@10:         }
yading@10:         out += frame->linesize[0];
yading@10:     }
yading@10: }
yading@10: 
yading@10: static void cdxl_decode_ham8(CDXLVideoContext *c, AVFrame *frame)
yading@10: {
yading@10:     AVCodecContext *avctx = c->avctx;
yading@10:     uint32_t new_palette[64], r, g, b;
yading@10:     uint8_t *ptr, *out, index, op;
yading@10:     int x, y;
yading@10: 
yading@10:     ptr = c->new_video;
yading@10:     out = frame->data[0];
yading@10: 
yading@10:     import_palette(c, new_palette);
yading@10:     import_format(c, avctx->width, c->new_video);
yading@10: 
yading@10:     for (y = 0; y < avctx->height; y++) {
yading@10:         r = new_palette[0] & 0xFF0000;
yading@10:         g = new_palette[0] & 0xFF00;
yading@10:         b = new_palette[0] & 0xFF;
yading@10:         for (x = 0; x < avctx->width; x++) {
yading@10:             index  = *ptr++;
yading@10:             op     = index >> 6;
yading@10:             index &= 63;
yading@10:             switch (op) {
yading@10:             case 0:
yading@10:                 r = new_palette[index] & 0xFF0000;
yading@10:                 g = new_palette[index] & 0xFF00;
yading@10:                 b = new_palette[index] & 0xFF;
yading@10:                 break;
yading@10:             case 1:
yading@10:                 b = (index <<  2) | (b & 3);
yading@10:                 break;
yading@10:             case 2:
yading@10:                 r = (index << 18) | (r & (3 << 16));
yading@10:                 break;
yading@10:             case 3:
yading@10:                 g = (index << 10) | (g & (3 << 8));
yading@10:                 break;
yading@10:             }
yading@10:             AV_WL24(out + x * 3, r | g | b);
yading@10:         }
yading@10:         out += frame->linesize[0];
yading@10:     }
yading@10: }
yading@10: 
yading@10: static int cdxl_decode_frame(AVCodecContext *avctx, void *data,
yading@10:                              int *got_frame, AVPacket *pkt)
yading@10: {
yading@10:     CDXLVideoContext *c = avctx->priv_data;
yading@10:     AVFrame * const p = data;
yading@10:     int ret, w, h, encoding, aligned_width, buf_size = pkt->size;
yading@10:     const uint8_t *buf = pkt->data;
yading@10: 
yading@10:     if (buf_size < 32)
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     encoding        = buf[1] & 7;
yading@10:     c->format       = buf[1] & 0xE0;
yading@10:     w               = AV_RB16(&buf[14]);
yading@10:     h               = AV_RB16(&buf[16]);
yading@10:     c->bpp          = buf[19];
yading@10:     c->palette_size = AV_RB16(&buf[20]);
yading@10:     c->palette      = buf + 32;
yading@10:     c->video        = c->palette + c->palette_size;
yading@10:     c->video_size   = buf_size - c->palette_size - 32;
yading@10: 
yading@10:     if (c->palette_size > 512)
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     if (buf_size < c->palette_size + 32)
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     if (c->bpp < 1)
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     if (c->format != BIT_PLANAR && c->format != BIT_LINE) {
yading@10:         avpriv_request_sample(avctx, "Pixel format 0x%0x", c->format);
yading@10:         return AVERROR_PATCHWELCOME;
yading@10:     }
yading@10: 
yading@10:     if ((ret = av_image_check_size(w, h, 0, avctx)) < 0)
yading@10:         return ret;
yading@10:     if (w != avctx->width || h != avctx->height)
yading@10:         avcodec_set_dimensions(avctx, w, h);
yading@10: 
yading@10:     aligned_width = FFALIGN(c->avctx->width, 16);
yading@10:     c->padded_bits  = aligned_width - c->avctx->width;
yading@10:     if (c->video_size < aligned_width * avctx->height * c->bpp / 8)
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     if (!encoding && c->palette_size && c->bpp <= 8) {
yading@10:         avctx->pix_fmt = AV_PIX_FMT_PAL8;
yading@10:     } else if (encoding == 1 && (c->bpp == 6 || c->bpp == 8)) {
yading@10:         if (c->palette_size != (1 << (c->bpp - 1)))
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         avctx->pix_fmt = AV_PIX_FMT_BGR24;
yading@10:     } else {
yading@10:         avpriv_request_sample(avctx, "Encoding %d and bpp %d",
yading@10:                               encoding, c->bpp);
yading@10:         return AVERROR_PATCHWELCOME;
yading@10:     }
yading@10: 
yading@10:     if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
yading@10:         return ret;
yading@10:     p->pict_type = AV_PICTURE_TYPE_I;
yading@10: 
yading@10:     if (encoding) {
yading@10:         av_fast_padded_malloc(&c->new_video, &c->new_video_size,
yading@10:                               h * w + FF_INPUT_BUFFER_PADDING_SIZE);
yading@10:         if (!c->new_video)
yading@10:             return AVERROR(ENOMEM);
yading@10:         if (c->bpp == 8)
yading@10:             cdxl_decode_ham8(c, p);
yading@10:         else
yading@10:             cdxl_decode_ham6(c, p);
yading@10:     } else {
yading@10:         cdxl_decode_rgb(c, p);
yading@10:     }
yading@10:     *got_frame = 1;
yading@10: 
yading@10:     return buf_size;
yading@10: }
yading@10: 
yading@10: static av_cold int cdxl_decode_end(AVCodecContext *avctx)
yading@10: {
yading@10:     CDXLVideoContext *c = avctx->priv_data;
yading@10: 
yading@10:     av_free(c->new_video);
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: AVCodec ff_cdxl_decoder = {
yading@10:     .name           = "cdxl",
yading@10:     .type           = AVMEDIA_TYPE_VIDEO,
yading@10:     .id             = AV_CODEC_ID_CDXL,
yading@10:     .priv_data_size = sizeof(CDXLVideoContext),
yading@10:     .init           = cdxl_decode_init,
yading@10:     .close          = cdxl_decode_end,
yading@10:     .decode         = cdxl_decode_frame,
yading@10:     .capabilities   = CODEC_CAP_DR1,
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("Commodore CDXL video"),
yading@10: };