/* * Quicktime Planar RGB (8BPS) Video Decoder * Copyright (C) 2003 Roberto Togni * * 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 * QT 8BPS Video Decoder by Roberto Togni * For more information about the 8BPS format, visit: *   http://www.pcisys.net/~melanson/codecs/ * * Supports: PAL8 (RGB 8bpp, paletted) *         : GBRP (RGB 24bpp) *         : GBRAP (RGB 32bpp, 4th plane is alpha) */ #include <string.h> #include "libavutil/intreadwrite.h"#include "libavutil/internal.h"#include "avcodec.h"#include "codec_internal.h"#include "decode.h" typedef struct EightBpsContext {    AVCodecContext *avctx;     uint8_t planes;    uint8_t planemap[4];     uint32_t pal[256];} EightBpsContext; static int decode_frame(AVCodecContext *avctx, AVFrame *frame,                        int *got_frame, AVPacket *avpkt){    const uint8_t *buf = avpkt->data;    int buf_size       = avpkt->size;    EightBpsContext * const c = avctx->priv_data;    const uint8_t *encoded = buf;    uint8_t *pixptr, *pixptr_end;    unsigned int height = avctx->height; // Real image height    unsigned int dlen, p, row;    const uint8_t *lp, *dp, *ep;    uint8_t count;    const uint8_t *planemap = c->planemap;    unsigned int planes = c->planes;    int ret;     if (buf_size < planes * height * (2 + 2*((avctx->width+128)/129)))        return AVERROR_INVALIDDATA;     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)        return ret;     ep = encoded + buf_size;     /* Set data pointer after line lengths */    dp = encoded + planes * (height << 1);     for (p = 0; p < planes; p++) {        const int pi = planemap[p];        /* Lines length pointer for this plane */        lp = encoded + p * (height << 1);         /* Decode a plane */        for (row = 0; row < height; row++) {            pixptr = frame->data[pi] + row * frame->linesize[pi];            pixptr_end = pixptr + frame->linesize[pi];            if (ep - lp < row * 2 + 2)                return AVERROR_INVALIDDATA;            dlen = AV_RB16(lp + row * 2);            /* Decode a row of this plane */            while (dlen > 0) {                if (ep - dp <= 1)                    return AVERROR_INVALIDDATA;                if ((count = *dp++) <= 127) {                    count++;                    dlen -= count + 1;                    if (pixptr_end - pixptr < count)                        break;                    if (ep - dp < count)                        return AVERROR_INVALIDDATA;                    memcpy(pixptr, dp, count);                    pixptr += count;                    dp += count;                } else {                    count = 257 - count;                    if (pixptr_end - pixptr < count)                        break;                    memset(pixptr, dp[0], count);                    pixptr += count;                    dp++;                    dlen -= 2;                }            }        }    }     if (avctx->bits_per_coded_sample <= 8) {#if FF_API_PALETTE_HAS_CHANGEDFF_DISABLE_DEPRECATION_WARNINGS        frame->palette_has_changed =#endif        ff_copy_palette(c->pal, avpkt, avctx);#if FF_API_PALETTE_HAS_CHANGEDFF_ENABLE_DEPRECATION_WARNINGS#endif         memcpy(frame->data[1], c->pal, AVPALETTE_SIZE);    }     *got_frame = 1;     /* always report that the buffer was completely consumed */    return buf_size;} static av_cold int decode_init(AVCodecContext *avctx){    EightBpsContext * const c = avctx->priv_data;     c->avctx       = avctx;     switch (avctx->bits_per_coded_sample) {    case 8:        avctx->pix_fmt = AV_PIX_FMT_PAL8;        c->planes      = 1;        c->planemap[0] = 0; // 1st plane is palette indexes        break;    case 24:        avctx->pix_fmt = AV_PIX_FMT_GBRP;        c->planes      = 3;        c->planemap[0] = 2; // 1st plane is red        c->planemap[1] = 0; // 2nd plane is green        c->planemap[2] = 1; // 3rd plane is blue        break;    case 32:        avctx->pix_fmt = AV_PIX_FMT_GBRAP;        c->planes      = 4;        break;    default:        av_log(avctx, AV_LOG_ERROR, "Error: Unsupported color depth: %u.\n",               avctx->bits_per_coded_sample);        return AVERROR_INVALIDDATA;    }     if (avctx->pix_fmt == AV_PIX_FMT_GBRAP) {        c->planemap[0] = 2; // 1st plane is red        c->planemap[1] = 0; // 2nd plane is green        c->planemap[2] = 1; // 3rd plane is blue        c->planemap[3] = 3; // 4th plane is alpha    }    return 0;} const FFCodec ff_eightbps_decoder = {    .p.name         = "8bps",    CODEC_LONG_NAME("QuickTime 8BPS video"),    .p.type         = AVMEDIA_TYPE_VIDEO,    .p.id           = AV_CODEC_ID_8BPS,    .priv_data_size = sizeof(EightBpsContext),    .init           = decode_init,    FF_CODEC_DECODE_CB(decode_frame),    .p.capabilities = AV_CODEC_CAP_DR1,};