/*
  * 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 "bswapdsp.h"

 #include "get_bits.h"

 #include "internal.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_1_2_4_8_bpp; // 1, 2, 4 and 8 bpp in avi/mov, 1 and 8 bpp in nut
     int is_mono;
     int is_pal8;
     int is_nut_mono;
     int is_nut_pal8;

     int is_yuv2;

     int is_lt_16bpp; // 16bpp pixfmt and bits_per_coded_sample < 16

     int tff;

     BswapDSPContext bbdsp;

     void *bitstream_buf;
     unsigned int bitstream_buf_size;

 } RawVideoContext;
 

 static const AVOption options[]={

 {"top", "top field first", offsetof(RawVideoContext, tff), AV_OPT_TYPE_BOOL, {.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 av_cold int raw_init_decoder(AVCodecContext *avctx)

 {
     RawVideoContext *context = avctx->priv_data;

     const AVPixFmtDescriptor *desc;

     ff_bswapdsp_init(&context->bbdsp);

     if (   avctx->codec_tag == MKTAG('r','a','w',' ')
         || avctx->codec_tag == MKTAG('N','O','1','6'))

         avctx->pix_fmt = avpriv_find_pix_fmt(avpriv_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(avpriv_pix_fmt_bps_avi,

                                       avctx->bits_per_coded_sample);

     else if (avctx->codec_tag && (avctx->codec_tag & 0xFFFFFF) != MKTAG('B','I','T', 0))

         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(avpriv_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 == 1)

                 memset(context->palette->data, 0xff, 4);
         }

     }

     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->pix_fmt == AV_PIX_FMT_MONOWHITE ||
         avctx->pix_fmt == AV_PIX_FMT_MONOBLACK)
         context->is_mono = 1;
     else if (avctx->pix_fmt == AV_PIX_FMT_PAL8)
         context->is_pal8 = 1;
 
     if (avctx->codec_tag == MKTAG('B','1','W','0') ||
         avctx->codec_tag == MKTAG('B','0','W','1'))
         context->is_nut_mono = 1;

     else if (avctx->codec_tag == MKTAG('P','A','L',8))

         context->is_nut_pal8 = 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, AVFrame *frame)

 {

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

 }
 

 /*
  * Scale sample to 16-bit resolution
  */
 #define SCALE16(x, bits) (((x) << (16 - (bits))) | ((x) >> (2 * (bits) - 16)))
 
 /**
  * Scale buffer to 16 bits per coded sample resolution
  */
 #define MKSCALE16(name, r16, w16) \
 static void name(AVCodecContext *avctx, uint8_t * dst, const uint8_t *buf, int buf_size, int packed) \
 { \
     int i; \
     if (!packed) { \
         for (i = 0; i + 1 < buf_size; i += 2) \
             w16(dst + i, SCALE16(r16(buf + i), avctx->bits_per_coded_sample)); \
     } else { \
         GetBitContext gb; \
         init_get_bits(&gb, buf, buf_size * 8); \
         for (i = 0; i < avctx->width * avctx->height; i++) { \
             int sample = get_bits(&gb, avctx->bits_per_coded_sample); \
             w16(dst + i*2, SCALE16(sample, avctx->bits_per_coded_sample)); \
         } \
    } \
 }
 
 MKSCALE16(scale16be, AV_RB16, AV_WB16)
 MKSCALE16(scale16le, AV_RL16, AV_WL16)
 

 static int raw_decode(AVCodecContext *avctx, void *data, int *got_frame,
                       AVPacket *avpkt)

 {

     const AVPixFmtDescriptor *desc;

     RawVideoContext *context       = avctx->priv_data;
     const uint8_t *buf             = avpkt->data;
     int buf_size                   = avpkt->size;

     int linesize_align             = 4;

     int stride;

     int res, len;

     int need_copy;

     AVFrame   *frame   = data;

     if (avctx->width <= 0) {
         av_log(avctx, AV_LOG_ERROR, "width is not set\n");
         return AVERROR_INVALIDDATA;
     }

     if (avctx->height <= 0) {
         av_log(avctx, AV_LOG_ERROR, "height is not set\n");
         return AVERROR_INVALIDDATA;
     }
 

     if (context->is_nut_mono)
         stride = avctx->width / 8 + (avctx->width & 7 ? 1 : 0);
     else if (context->is_nut_pal8)
         stride = avctx->width;
     else
         stride = avpkt->size / avctx->height;
 

     av_log(avctx, AV_LOG_DEBUG, "PACKET SIZE: %d, STRIDE: %d\n", avpkt->size, stride);
 

     if (stride == 0 || avpkt->size < stride * avctx->height) {
         av_log(avctx, AV_LOG_ERROR, "Packet too small (%d)\n", avpkt->size);

         return AVERROR_INVALIDDATA;
     }

     desc = av_pix_fmt_desc_get(avctx->pix_fmt);

     if ((avctx->bits_per_coded_sample == 8 || avctx->bits_per_coded_sample == 4 ||
          avctx->bits_per_coded_sample == 2 || avctx->bits_per_coded_sample == 1 ||
          (avctx->bits_per_coded_sample == 0 && (context->is_nut_pal8 || context->is_mono)) ) &&

         (context->is_mono || context->is_pal8) &&
         (!avctx->codec_tag || avctx->codec_tag == MKTAG('r','a','w',' ') ||
                 context->is_nut_mono || context->is_nut_pal8)) {

         context->is_1_2_4_8_bpp = 1;

         if (context->is_mono) {

             int row_bytes = avctx->width / 8 + (avctx->width & 7 ? 1 : 0);
             context->frame_size = av_image_get_buffer_size(avctx->pix_fmt,
                                                            FFALIGN(row_bytes, 16) * 8,
                                                            avctx->height, 1);
         } else
             context->frame_size = av_image_get_buffer_size(avctx->pix_fmt,
                                                            FFALIGN(avctx->width, 16),
                                                            avctx->height, 1);

     } else {

         context->is_lt_16bpp = av_get_bits_per_pixel(desc) == 16 && avctx->bits_per_coded_sample > 8 && avctx->bits_per_coded_sample < 16;

         context->frame_size = av_image_get_buffer_size(avctx->pix_fmt, avctx->width,
                                                        avctx->height, 1);

     }

     if (context->frame_size < 0)
         return context->frame_size;
 

     need_copy = !avpkt->buf || context->is_1_2_4_8_bpp || context->is_yuv2 || context->is_lt_16bpp;

     frame->pict_type        = AV_PICTURE_TYPE_I;
     frame->key_frame        = 1;

 
     res = ff_decode_frame_props(avctx, frame);
     if (res < 0)
         return res;

     frame->pkt_pos      = avctx->internal->last_pkt_props->pos;
     frame->pkt_duration = avctx->internal->last_pkt_props->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);
 

     // 1, 2, 4 and 8 bpp in avi/mov, 1 and 8 bpp in nut

     if (context->is_1_2_4_8_bpp) {
         int i, j, row_pix = 0;

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

         buf_size = context->frame_size - (context->is_pal8 ? AVPALETTE_SIZE : 0);
         if (avctx->bits_per_coded_sample == 8 || context->is_nut_pal8 || context->is_mono) {
             int pix_per_byte = context->is_mono ? 8 : 1;

             for (i = 0, j = 0; j < buf_size && i<avpkt->size; i++, j++) {
                 dst[j] = buf[i];

                 row_pix += pix_per_byte;
                 if (row_pix >= avctx->width) {

                     i += stride - (i % stride) - 1;

                     j += 16 - (j % 16) - 1;
                     row_pix = 0;
                 }
             }
         } else if (avctx->bits_per_coded_sample == 4) {
             for (i = 0, j = 0; 2 * j + 1 < buf_size && i<avpkt->size; i++, j++) {
                 dst[2 * j + 0] = buf[i] >> 4;
                 dst[2 * j + 1] = buf[i] & 15;
                 row_pix += 2;
                 if (row_pix >= avctx->width) {

                     i += stride - (i % stride) - 1;

                     j += 8 - (j % 8) - 1;
                     row_pix = 0;
                 }

             }

         } else if (avctx->bits_per_coded_sample == 2) {

             for (i = 0, j = 0; 4 * j + 3 < buf_size && i<avpkt->size; i++, j++) {
                 dst[4 * j + 0] = buf[i] >> 6;
                 dst[4 * j + 1] = buf[i] >> 4 & 3;
                 dst[4 * j + 2] = buf[i] >> 2 & 3;
                 dst[4 * j + 3] = buf[i]      & 3;
                 row_pix += 4;
                 if (row_pix >= avctx->width) {

                     i += stride - (i % stride) - 1;

                     j += 4 - (j % 4) - 1;
                     row_pix = 0;
                 }

             }

         } else {
             av_assert0(avctx->bits_per_coded_sample == 1);

             for (i = 0, j = 0; 8 * j + 7 < buf_size && i<avpkt->size; i++, j++) {
                 dst[8 * j + 0] = buf[i] >> 7;
                 dst[8 * j + 1] = buf[i] >> 6 & 1;
                 dst[8 * j + 2] = buf[i] >> 5 & 1;
                 dst[8 * j + 3] = buf[i] >> 4 & 1;
                 dst[8 * j + 4] = buf[i] >> 3 & 1;
                 dst[8 * j + 5] = buf[i] >> 2 & 1;
                 dst[8 * j + 6] = buf[i] >> 1 & 1;
                 dst[8 * j + 7] = buf[i]      & 1;
                 row_pix += 8;
                 if (row_pix >= avctx->width) {

                     i += stride - (i % stride) - 1;

                     j += 2 - (j % 2) - 1;
                     row_pix = 0;
                 }

             }

         }

         linesize_align = 16;

         buf = dst;

     } else if (context->is_lt_16bpp) {
         uint8_t *dst = frame->buf[0]->data;

         int packed = (avctx->codec_tag & 0xFFFFFF) == MKTAG('B','I','T', 0);
         int swap   =  avctx->codec_tag >> 24;
 
         if (packed && swap) {
             av_fast_padded_malloc(&context->bitstream_buf, &context->bitstream_buf_size, buf_size);
             if (!context->bitstream_buf)
                 return AVERROR(ENOMEM);
             if (swap == 16)

                 context->bbdsp.bswap16_buf(context->bitstream_buf, (const uint16_t*)buf, buf_size / 2);

             else if (swap == 32)

                 context->bbdsp.bswap_buf(context->bitstream_buf, (const uint32_t*)buf, buf_size / 4);

             else
                 return AVERROR_INVALIDDATA;
             buf = context->bitstream_buf;

         }

 
         if (desc->flags & AV_PIX_FMT_FLAG_BE)
             scale16be(avctx, dst, buf, buf_size, packed);
         else
             scale16le(avctx, dst, buf, buf_size, packed);
 

         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 && ((avctx->codec_tag & 0xFFFFFF) != MKTAG('B','I','T', 0) || !need_copy)) {

         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 = av_image_fill_arrays(frame->data, frame->linesize,
                                     buf, avctx->pix_fmt,

                                     avctx->width, avctx->height, 1)) < 0) {

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

         return res;

     }

     if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {

         int pal_size;

         const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE,

                                                      &pal_size);

         int ret;

         if (pal && pal_size != AVPALETTE_SIZE) {

             av_log(avctx, AV_LOG_ERROR, "Palette size %d is wrong\n", pal_size);
             pal = NULL;
         }
 

         if (!context->palette)

             context->palette = av_buffer_alloc(AVPALETTE_SIZE);

         if (!context->palette) {
             av_buffer_unref(&frame->buf[0]);
             return AVERROR(ENOMEM);
         }
         ret = av_buffer_make_writable(&context->palette);
         if (ret < 0) {
             av_buffer_unref(&frame->buf[0]);
             return ret;
         }
 
         if (pal) {

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

             frame->palette_has_changed = 1;

         } else if (context->is_nut_pal8) {
             int vid_size = avctx->width * avctx->height;

             int pal_size = avpkt->size - vid_size;
 
             if (avpkt->size > vid_size && pal_size <= AVPALETTE_SIZE) {

                 pal = avpkt->data + vid_size;

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

                 frame->palette_has_changed = 1;
             }

         }

     }

     if ((avctx->pix_fmt==AV_PIX_FMT_RGB24    ||
         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_MONOBLACK ||

         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, frame);

     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 *, frame->data[1], frame->data[2]);

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

         frame->data[1] = frame->data[1] +  (avctx->width+1)*(avctx->height+1) -avctx->width*avctx->height;
         frame->data[2] = frame->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 = frame->data[0];

         for (y = 0; y < avctx->height; y++) {
             for (x = 0; x < avctx->width; x++)
                 line[2 * x + 1] ^= 0x80;

             line += frame->linesize[0];

         }
     }
 

     if (avctx->codec_tag == AV_RL32("b64a") &&
         avctx->pix_fmt   == AV_PIX_FMT_RGBA64BE) {
         uint8_t *dst = frame->data[0];
         uint64_t v;
         int x;
         for (x = 0; x >> 3 < avctx->width * avctx->height; x += 8) {
             v = AV_RB64(&dst[x]);
             AV_WB64(&dst[x], v << 16 | v >> 48);
         }
     }
 

     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,

     .capabilities   = AV_CODEC_CAP_PARAM_CHANGE,

 };