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/*
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 * NuppelVideo decoder
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 * Copyright (c) 2006 Reimar Doeffinger
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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 <stdio.h>
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#include <stdlib.h>
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#include "libavutil/bswap.h"
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#include "libavutil/lzo.h"
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#include "libavutil/imgutils.h"
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#include "avcodec.h"
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#include "dsputil.h"
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#include "rtjpeg.h"
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typedef struct {
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    AVFrame pic;
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    int codec_frameheader;
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    int quality;
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    int width, height;
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    unsigned int decomp_size;
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    unsigned char* decomp_buf;
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    uint32_t lq[64], cq[64];
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    RTJpegContext rtj;
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    DSPContext dsp;
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} NuvContext;
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static const uint8_t fallback_lquant[] = {
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    16,  11,  10,  16,  24,  40,  51,  61,
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    12,  12,  14,  19,  26,  58,  60,  55,
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    14,  13,  16,  24,  40,  57,  69,  56,
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    14,  17,  22,  29,  51,  87,  80,  62,
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    18,  22,  37,  56,  68, 109, 103,  77,
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    24,  35,  55,  64,  81, 104, 113,  92,
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    49,  64,  78,  87, 103, 121, 120, 101,
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    72,  92,  95,  98, 112, 100, 103,  99
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};
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static const uint8_t fallback_cquant[] = {
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    17, 18, 24, 47, 99, 99, 99, 99,
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    18, 21, 26, 66, 99, 99, 99, 99,
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    24, 26, 56, 99, 99, 99, 99, 99,
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    47, 66, 99, 99, 99, 99, 99, 99,
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    99, 99, 99, 99, 99, 99, 99, 99,
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    99, 99, 99, 99, 99, 99, 99, 99,
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    99, 99, 99, 99, 99, 99, 99, 99,
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    99, 99, 99, 99, 99, 99, 99, 99
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};
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/**
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 * \brief copy frame data from buffer to AVFrame, handling stride.
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 * \param f destination AVFrame
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 * \param src source buffer, does not use any line-stride
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 * \param width width of the video frame
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 * \param height height of the video frame
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 */
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static void copy_frame(AVFrame *f, const uint8_t *src,
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                       int width, int height) {
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    AVPicture pic;
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    avpicture_fill(&pic, src, PIX_FMT_YUV420P, width, height);
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    av_picture_copy((AVPicture *)f, &pic, PIX_FMT_YUV420P, width, height);
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}
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/**
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 * \brief extract quantization tables from codec data into our context
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 */
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static int get_quant(AVCodecContext *avctx, NuvContext *c,
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                     const uint8_t *buf, int size) {
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    int i;
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    if (size < 2 * 64 * 4) {
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        av_log(avctx, AV_LOG_ERROR, "insufficient rtjpeg quant data\n");
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        return -1;
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    }
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    for (i = 0; i < 64; i++, buf += 4)
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        c->lq[i] = AV_RL32(buf);
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    for (i = 0; i < 64; i++, buf += 4)
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        c->cq[i] = AV_RL32(buf);
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    return 0;
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}
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/**
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 * \brief set quantization tables from a quality value
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 */
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static void get_quant_quality(NuvContext *c, int quality) {
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    int i;
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    quality = FFMAX(quality, 1);
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    for (i = 0; i < 64; i++) {
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        c->lq[i] = (fallback_lquant[i] << 7) / quality;
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        c->cq[i] = (fallback_cquant[i] << 7) / quality;
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    }
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}
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static int codec_reinit(AVCodecContext *avctx, int width, int height, int quality) {
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    NuvContext *c = avctx->priv_data;
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    width = (width + 1) & ~1;
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    height = (height + 1) & ~1;
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    if (quality >= 0)
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        get_quant_quality(c, quality);
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    if (width != c->width || height != c->height) {
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        if (av_image_check_size(height, width, 0, avctx) < 0)
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            return 0;
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        avctx->width = c->width = width;
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        avctx->height = c->height = height;
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        av_fast_malloc(&c->decomp_buf, &c->decomp_size, c->height * c->width * 3 / 2);
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        if (!c->decomp_buf) {
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            av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
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            return 0;
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        }
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        rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height, c->lq, c->cq);
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    } else if (quality != c->quality)
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        rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height, c->lq, c->cq);
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    return 1;
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}
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static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
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                        AVPacket *avpkt) {
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    const uint8_t *buf = avpkt->data;
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    int buf_size = avpkt->size;
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    NuvContext *c = avctx->priv_data;
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    AVFrame *picture = data;
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    int orig_size = buf_size;
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    int keyframe;
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    int result;
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    enum {NUV_UNCOMPRESSED = '0', NUV_RTJPEG = '1',
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          NUV_RTJPEG_IN_LZO = '2', NUV_LZO = '3',
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          NUV_BLACK = 'N', NUV_COPY_LAST = 'L'} comptype;
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    if (buf_size < 12) {
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        av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
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        return -1;
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    }
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    // codec data (rtjpeg quant tables)
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    if (buf[0] == 'D' && buf[1] == 'R') {
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        int ret;
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        // skip rest of the frameheader.
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        buf = &buf[12];
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        buf_size -= 12;
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        ret = get_quant(avctx, c, buf, buf_size);
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        if (ret < 0)
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            return ret;
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        rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height, c->lq, c->cq);
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        return orig_size;
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    }
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    if (buf[0] != 'V' || buf_size < 12) {
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        av_log(avctx, AV_LOG_ERROR, "not a nuv video frame\n");
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        return -1;
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    }
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    comptype = buf[1];
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    switch (comptype) {
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        case NUV_RTJPEG_IN_LZO:
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        case NUV_RTJPEG:
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            keyframe = !buf[2]; break;
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        case NUV_COPY_LAST:
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            keyframe = 0; break;
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        default:
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            keyframe = 1; break;
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    }
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    // skip rest of the frameheader.
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    buf = &buf[12];
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    buf_size -= 12;
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    if (comptype == NUV_RTJPEG_IN_LZO || comptype == NUV_LZO) {
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        int outlen = c->decomp_size, inlen = buf_size;
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        if (av_lzo1x_decode(c->decomp_buf, &outlen, buf, &inlen))
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            av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
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        buf = c->decomp_buf;
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        buf_size = c->decomp_size;
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    }
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    if (c->codec_frameheader) {
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        int w, h, q;
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        if (buf_size < 12) {
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            av_log(avctx, AV_LOG_ERROR, "invalid nuv video frame\n");
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            return -1;
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        }
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        w = AV_RL16(&buf[6]);
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        h = AV_RL16(&buf[8]);
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        q = buf[10];
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        if (!codec_reinit(avctx, w, h, q))
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            return -1;
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        buf = &buf[12];
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        buf_size -= 12;
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    }
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    if (keyframe && c->pic.data[0])
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        avctx->release_buffer(avctx, &c->pic);
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    c->pic.reference = 3;
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    c->pic.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_READABLE |
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                          FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
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    result = avctx->reget_buffer(avctx, &c->pic);
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    if (result < 0) {
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        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
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        return -1;
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    }
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    c->pic.pict_type = keyframe ? FF_I_TYPE : FF_P_TYPE;
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    c->pic.key_frame = keyframe;
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    // decompress/copy/whatever data
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    switch (comptype) {
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        case NUV_LZO:
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        case NUV_UNCOMPRESSED: {
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            int height = c->height;
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            if (buf_size < c->width * height * 3 / 2) {
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                av_log(avctx, AV_LOG_ERROR, "uncompressed frame too short\n");
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                height = buf_size / c->width / 3 * 2;
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            }
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            copy_frame(&c->pic, buf, c->width, height);
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            break;
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        }
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        case NUV_RTJPEG_IN_LZO:
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        case NUV_RTJPEG: {
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            rtjpeg_decode_frame_yuv420(&c->rtj, &c->pic, buf, buf_size);
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            break;
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        }
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        case NUV_BLACK: {
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            memset(c->pic.data[0], 0, c->width * c->height);
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            memset(c->pic.data[1], 128, c->width * c->height / 4);
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            memset(c->pic.data[2], 128, c->width * c->height / 4);
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            break;
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        }
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        case NUV_COPY_LAST: {
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            /* nothing more to do here */
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            break;
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        }
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        default:
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            av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
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            return -1;
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    }
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    *picture = c->pic;
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    *data_size = sizeof(AVFrame);
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    return orig_size;
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}
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static av_cold int decode_init(AVCodecContext *avctx) {
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    NuvContext *c = avctx->priv_data;
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    avctx->pix_fmt = PIX_FMT_YUV420P;
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    c->pic.data[0] = NULL;
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    c->decomp_buf = NULL;
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    c->quality = -1;
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    c->width = 0;
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    c->height = 0;
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    c->codec_frameheader = avctx->codec_tag == MKTAG('R', 'J', 'P', 'G');
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    if (avctx->extradata_size)
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        get_quant(avctx, c, avctx->extradata, avctx->extradata_size);
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    dsputil_init(&c->dsp, avctx);
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    if (!codec_reinit(avctx, avctx->width, avctx->height, -1))
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        return 1;
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    return 0;
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}
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static av_cold int decode_end(AVCodecContext *avctx) {
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    NuvContext *c = avctx->priv_data;
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    av_freep(&c->decomp_buf);
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    if (c->pic.data[0])
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        avctx->release_buffer(avctx, &c->pic);
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    return 0;
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}
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AVCodec ff_nuv_decoder = {
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    "nuv",
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    AVMEDIA_TYPE_VIDEO,
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    CODEC_ID_NUV,
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    sizeof(NuvContext),
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    decode_init,
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    NULL,
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    decode_end,
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    decode_frame,
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    CODEC_CAP_DR1,
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    .long_name = NULL_IF_CONFIG_SMALL("NuppelVideo/RTJPEG"),
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};
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