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/*

 * Raw Video Decoder

 * Copyright (c) 2001 Fabrice Bellard

 *

 * 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

 * Raw Video Decoder

 */

#include "avcodec.h"

#include "raw.h"

#include "libavutil/avassert.h"

#include "libavutil/buffer.h"

#include "libavutil/common.h"

#include "libavutil/intreadwrite.h"

#include "libavutil/imgutils.h"

#include "libavutil/opt.h"

typedef struct RawVideoContext {

    AVClass *av_class;

    AVBufferRef *palette;

    int frame_size;  /* size of the frame in bytes */

    int flip;

    int is_2_4_bpp; // 2 or 4 bpp raw in avi/mov

    int is_yuv2;

    int tff;

} RawVideoContext;

static const AVOption options[]={

{"top", "top field first", offsetof(RawVideoContext, tff), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM|AV_OPT_FLAG_VIDEO_PARAM},

{NULL}

};

static const AVClass rawdec_class = {

    .class_name = "rawdec",

    .option     = options,

    .version    = LIBAVUTIL_VERSION_INT,

};

static const PixelFormatTag pix_fmt_bps_avi[] = {

    { AV_PIX_FMT_MONOWHITE, 1 },

    { AV_PIX_FMT_PAL8,    2 },

    { AV_PIX_FMT_PAL8,    4 },

    { AV_PIX_FMT_PAL8,    8 },

    { AV_PIX_FMT_RGB444LE, 12 },

    { AV_PIX_FMT_RGB555LE, 15 },

    { AV_PIX_FMT_RGB555LE, 16 },

    { AV_PIX_FMT_BGR24,  24 },

    { AV_PIX_FMT_BGRA,   32 },

    { AV_PIX_FMT_NONE,    0 },

};

static const PixelFormatTag pix_fmt_bps_mov[] = {

    { AV_PIX_FMT_MONOWHITE, 1 },

    { AV_PIX_FMT_PAL8,      2 },

    { AV_PIX_FMT_PAL8,      4 },

    { AV_PIX_FMT_PAL8,      8 },

    // FIXME swscale does not support 16 bit in .mov, sample 16bit.mov

    // http://developer.apple.com/documentation/QuickTime/QTFF/QTFFChap3/qtff3.html

    { AV_PIX_FMT_RGB555BE, 16 },

    { AV_PIX_FMT_RGB24,    24 },

    { AV_PIX_FMT_ARGB,     32 },

    { AV_PIX_FMT_MONOWHITE,33 },

    { AV_PIX_FMT_NONE,      0 },

};

enum AVPixelFormat avpriv_find_pix_fmt(const PixelFormatTag *tags,

                                       unsigned int fourcc)

{

    while (tags->pix_fmt >= 0) {

        if (tags->fourcc == fourcc)

            return tags->pix_fmt;

        tags++;

    }

    return AV_PIX_FMT_NONE;

}

#if LIBAVCODEC_VERSION_MAJOR < 55

enum AVPixelFormat ff_find_pix_fmt(const PixelFormatTag *tags, unsigned int fourcc)

{

    return avpriv_find_pix_fmt(tags, fourcc);

}

#endif

static av_cold int raw_init_decoder(AVCodecContext *avctx)

{

    RawVideoContext *context = avctx->priv_data;

    const AVPixFmtDescriptor *desc;

    if (   avctx->codec_tag == MKTAG('r','a','w',' ')

        || avctx->codec_tag == MKTAG('N','O','1','6'))

        avctx->pix_fmt = avpriv_find_pix_fmt(pix_fmt_bps_mov,

                                      avctx->bits_per_coded_sample);

    else if (avctx->codec_tag == MKTAG('W', 'R', 'A', 'W'))

        avctx->pix_fmt = avpriv_find_pix_fmt(pix_fmt_bps_avi,

                                      avctx->bits_per_coded_sample);

    else if (avctx->codec_tag)

        avctx->pix_fmt = avpriv_find_pix_fmt(ff_raw_pix_fmt_tags, avctx->codec_tag);

    else if (avctx->pix_fmt == AV_PIX_FMT_NONE && avctx->bits_per_coded_sample)

        avctx->pix_fmt = avpriv_find_pix_fmt(pix_fmt_bps_avi,

                                      avctx->bits_per_coded_sample);

    desc = av_pix_fmt_desc_get(avctx->pix_fmt);

    if (!desc) {

        av_log(avctx, AV_LOG_ERROR, "Invalid pixel format.\n");

        return AVERROR(EINVAL);

    }

    if (desc->flags & (AV_PIX_FMT_FLAG_PAL | AV_PIX_FMT_FLAG_PSEUDOPAL)) {

        context->palette = av_buffer_alloc(AVPALETTE_SIZE);

        if (!context->palette)

            return AVERROR(ENOMEM);

        if (desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL)

            avpriv_set_systematic_pal2((uint32_t*)context->palette->data, avctx->pix_fmt);

        else

            memset(context->palette->data, 0, AVPALETTE_SIZE);

    }

    if ((avctx->bits_per_coded_sample == 4 || avctx->bits_per_coded_sample == 2) &&

        avctx->pix_fmt == AV_PIX_FMT_PAL8 &&

       (!avctx->codec_tag || avctx->codec_tag == MKTAG('r','a','w',' '))) {

        context->is_2_4_bpp = 1;

        context->frame_size = avpicture_get_size(avctx->pix_fmt,

                                                 FFALIGN(avctx->width, 16),

                                                 avctx->height);

    } else {

        context->frame_size = avpicture_get_size(avctx->pix_fmt, avctx->width,

                                                 avctx->height);

    }

    if ((avctx->extradata_size >= 9 &&

         !memcmp(avctx->extradata + avctx->extradata_size - 9, "BottomUp", 9)) ||

        avctx->codec_tag == MKTAG('c','y','u','v') ||

        avctx->codec_tag == MKTAG(3, 0, 0, 0) ||

        avctx->codec_tag == MKTAG('W','R','A','W'))

        context->flip = 1;

    if (avctx->codec_tag == AV_RL32("yuv2") &&

        avctx->pix_fmt   == AV_PIX_FMT_YUYV422)

        context->is_yuv2 = 1;

    return 0;

}

static void flip(AVCodecContext *avctx, AVPicture *picture)

{

    picture->data[0]     += picture->linesize[0] * (avctx->height - 1);

    picture->linesize[0] *= -1;

}

static int raw_decode(AVCodecContext *avctx, void *data, int *got_frame,

                      AVPacket *avpkt)

{

    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(avctx->pix_fmt);

    RawVideoContext *context       = avctx->priv_data;

    const uint8_t *buf             = avpkt->data;

    int buf_size                   = avpkt->size;

    int linesize_align             = 4;

    int res, len;

    int need_copy                  = !avpkt->buf || context->is_2_4_bpp || context->is_yuv2;

    AVFrame   *frame   = data;

    AVPicture *picture = data;

    frame->pict_type        = AV_PICTURE_TYPE_I;

    frame->key_frame        = 1;

    frame->reordered_opaque = avctx->reordered_opaque;

    frame->pkt_pts          = avctx->pkt->pts;

    av_frame_set_pkt_pos     (frame, avctx->pkt->pos);

    av_frame_set_pkt_duration(frame, avctx->pkt->duration);

    if (context->tff >= 0) {

        frame->interlaced_frame = 1;

        frame->top_field_first  = context->tff;

    }

    if ((res = av_image_check_size(avctx->width, avctx->height, 0, avctx)) < 0)

        return res;

    if (need_copy)

        frame->buf[0] = av_buffer_alloc(FFMAX(context->frame_size, buf_size));

    else

        frame->buf[0] = av_buffer_ref(avpkt->buf);

    if (!frame->buf[0])

        return AVERROR(ENOMEM);

    //2bpp and 4bpp raw in avi and mov (yes this is ugly ...)

    if (context->is_2_4_bpp) {

        int i;

        uint8_t *dst = frame->buf[0]->data;

        buf_size = context->frame_size - AVPALETTE_SIZE;

        if (avctx->bits_per_coded_sample == 4) {

            for (i = 0; 2 * i + 1 < buf_size && isize; i++) {

                dst[2 * i + 0] = buf[i] >> 4;

                dst[2 * i + 1] = buf[i] & 15;

            }

            linesize_align = 8;

        } else {

            av_assert0(avctx->bits_per_coded_sample == 2);

            for (i = 0; 4 * i + 3 < buf_size && isize; i++) {

                dst[4 * i + 0] = buf[i] >> 6;

                dst[4 * i + 1] = buf[i] >> 4 & 3;

                dst[4 * i + 2] = buf[i] >> 2 & 3;

                dst[4 * i + 3] = buf[i]      & 3;

            }

            linesize_align = 16;

        }

        buf = dst;

    } else if (need_copy) {

        memcpy(frame->buf[0]->data, buf, buf_size);

        buf = frame->buf[0]->data;

    }

    if (avctx->codec_tag == MKTAG('A', 'V', '1', 'x') ||

        avctx->codec_tag == MKTAG('A', 'V', 'u', 'p'))

        buf += buf_size - context->frame_size;

    len = context->frame_size - (avctx->pix_fmt==AV_PIX_FMT_PAL8 ? AVPALETTE_SIZE : 0);

    if (buf_size < len) {

        av_log(avctx, AV_LOG_ERROR, "Invalid buffer size, packet size %d < expected frame_size %d\n", buf_size, len);

        av_buffer_unref(&frame->buf[0]);

        return AVERROR(EINVAL);

    }

    if ((res = avpicture_fill(picture, buf, avctx->pix_fmt,

                              avctx->width, avctx->height)) < 0) {

        av_buffer_unref(&frame->buf[0]);

        return res;

    }

    if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {

        const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE,

                                                     NULL);

        if (pal) {

            av_buffer_unref(&context->palette);

            context->palette = av_buffer_alloc(AVPALETTE_SIZE);

            if (!context->palette) {

                av_buffer_unref(&frame->buf[0]);

                return AVERROR(ENOMEM);

            }

            memcpy(context->palette->data, pal, AVPALETTE_SIZE);

            frame->palette_has_changed = 1;

        }

    }

    if ((avctx->pix_fmt==AV_PIX_FMT_BGR24    ||

        avctx->pix_fmt==AV_PIX_FMT_GRAY8    ||

        avctx->pix_fmt==AV_PIX_FMT_RGB555LE ||

        avctx->pix_fmt==AV_PIX_FMT_RGB555BE ||

        avctx->pix_fmt==AV_PIX_FMT_RGB565LE ||

        avctx->pix_fmt==AV_PIX_FMT_MONOWHITE ||

        avctx->pix_fmt==AV_PIX_FMT_PAL8) &&

        FFALIGN(frame->linesize[0], linesize_align) * avctx->height <= buf_size)

        frame->linesize[0] = FFALIGN(frame->linesize[0], linesize_align);

    if (avctx->pix_fmt == AV_PIX_FMT_NV12 && avctx->codec_tag == MKTAG('N', 'V', '1', '2') &&

        FFALIGN(frame->linesize[0], linesize_align) * avctx->height +

        FFALIGN(frame->linesize[1], linesize_align) * ((avctx->height + 1) / 2) <= buf_size) {

        int la0 = FFALIGN(frame->linesize[0], linesize_align);

        frame->data[1] += (la0 - frame->linesize[0]) * avctx->height;

        frame->linesize[0] = la0;

        frame->linesize[1] = FFALIGN(frame->linesize[1], linesize_align);

    }

    if ((avctx->pix_fmt == AV_PIX_FMT_PAL8 && buf_size < context->frame_size) ||

        (desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL)) {

        frame->buf[1]  = av_buffer_ref(context->palette);

        if (!frame->buf[1]) {

            av_buffer_unref(&frame->buf[0]);

            return AVERROR(ENOMEM);

        }

        frame->data[1] = frame->buf[1]->data;

    }

    if (avctx->pix_fmt == AV_PIX_FMT_BGR24 &&

        ((frame->linesize[0] + 3) & ~3) * avctx->height <= buf_size)

        frame->linesize[0] = (frame->linesize[0] + 3) & ~3;

    if (context->flip)

        flip(avctx, picture);

    if (avctx->codec_tag == MKTAG('Y', 'V', '1', '2') ||

        avctx->codec_tag == MKTAG('Y', 'V', '1', '6') ||

        avctx->codec_tag == MKTAG('Y', 'V', '2', '4') ||

        avctx->codec_tag == MKTAG('Y', 'V', 'U', '9'))

        FFSWAP(uint8_t *, picture->data[1], picture->data[2]);

    if (avctx->codec_tag == AV_RL32("I420") && (avctx->width+1)*(avctx->height+1) * 3/2 == buf_size) {

        picture->data[1] = picture->data[1] +  (avctx->width+1)*(avctx->height+1) -avctx->width*avctx->height;

        picture->data[2] = picture->data[2] + ((avctx->width+1)*(avctx->height+1) -avctx->width*avctx->height)*5/4;

    }

    if (avctx->codec_tag == AV_RL32("yuv2") &&

        avctx->pix_fmt   == AV_PIX_FMT_YUYV422) {

        int x, y;

        uint8_t *line = picture->data[0];

        for (y = 0; y < avctx->height; y++) {

            for (x = 0; x < avctx->width; x++)

                line[2 * x + 1] ^= 0x80;

            line += picture->linesize[0];

        }

    }

    if (avctx->codec_tag == AV_RL32("YVYU") &&

        avctx->pix_fmt   == AV_PIX_FMT_YUYV422) {

        int x, y;

        uint8_t *line = picture->data[0];

        for(y = 0; y < avctx->height; y++) {

            for(x = 0; x < avctx->width - 1; x += 2)

                FFSWAP(uint8_t, line[2*x + 1], line[2*x + 3]);

            line += picture->linesize[0];

        }

    }

    if (avctx->field_order > AV_FIELD_PROGRESSIVE) { /* we have interlaced material flagged in container */

        frame->interlaced_frame = 1;

        if (avctx->field_order == AV_FIELD_TT || avctx->field_order == AV_FIELD_TB)

            frame->top_field_first = 1;

    }

    *got_frame = 1;

    return buf_size;

}

static av_cold int raw_close_decoder(AVCodecContext *avctx)

{

    RawVideoContext *context = avctx->priv_data;

    av_buffer_unref(&context->palette);

    return 0;

}

AVCodec ff_rawvideo_decoder = {

    .name           = "rawvideo",

    .long_name      = NULL_IF_CONFIG_SMALL("raw video"),

    .type           = AVMEDIA_TYPE_VIDEO,

    .id             = AV_CODEC_ID_RAWVIDEO,

    .priv_data_size = sizeof(RawVideoContext),

    .init           = raw_init_decoder,

    .close          = raw_close_decoder,

    .decode         = raw_decode,

    .priv_class     = &rawdec_class,

};