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