/* * 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 */ #define UNCHECKED_BITSTREAM_READER 1 #include "libavutil/intreadwrite.h"#include "libavutil/mem.h"#include "avcodec.h"#include "bytestream.h"#include "codec_internal.h"#include "decode.h"#include "get_bits.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            type;    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){    if (c->type == 1) {        for (int 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);        }    } else {        for (int i = 0; i < c->palette_size / 3; i++) {            unsigned rgb = AV_RB24(&c->palette[i * 3]);            AV_WN32(&new_palette[i], (0xFFU << 24) | rgb);        }    }} 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, ptrdiff_t linesize, uint8_t *out){    for (int y = 0; y < c->avctx->height; y++)        memset(out + y * linesize, 0, c->avctx->width);     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, AVFrame *p,                             int *got_frame, AVPacket *pkt){    CDXLVideoContext *c = avctx->priv_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;    c->type         = buf[0];    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->type > 1)        return AVERROR_INVALIDDATA;    if (c->type == 1 && c->palette_size > 512)        return AVERROR_INVALIDDATA;    if (c->type == 0 && c->palette_size > 768)        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;     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;} const FFCodec ff_cdxl_decoder = {    .p.name         = "cdxl",    CODEC_LONG_NAME("Commodore CDXL video"),    .p.type         = AVMEDIA_TYPE_VIDEO,    .p.id           = AV_CODEC_ID_CDXL,    .priv_data_size = sizeof(CDXLVideoContext),    .init           = cdxl_decode_init,    .close          = cdxl_decode_end,    FF_CODEC_DECODE_CB(cdxl_decode_frame),    .p.capabilities = AV_CODEC_CAP_DR1,};