/*
  * IFF PBM/ILBM bitmap decoder
  * Copyright (c) 2010 Peter Ross <pross@xvid.org>

  * Copyright (c) 2010 Sebastian Vater <cdgs.basty@googlemail.com>

  *
  * 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

  * IFF PBM/ILBM bitmap decoder
  */
 

 #include "libavutil/imgutils.h"

 #include "bytestream.h"
 #include "avcodec.h"

 #include "get_bits.h"
 

 // TODO: masking bits
 typedef enum {
     MASK_NONE,
     MASK_HAS_MASK,
     MASK_HAS_TRANSPARENT_COLOR,
     MASK_LASSO
 } mask_type;
 

 typedef struct {
     AVFrame frame;

     int planesize;

     uint8_t * planebuf;

     uint8_t * ham_buf;      ///< temporary buffer for planar to chunky conversation
     uint32_t *ham_palbuf;   ///< HAM decode table
     unsigned  compression;  ///< delta compression method used
     unsigned  bpp;          ///< bits per plane to decode (differs from bits_per_coded_sample if HAM)
     unsigned  ham;          ///< 0 if non-HAM or number of hold bits (6 for bpp > 6, 4 otherwise)
     unsigned  flags;        ///< 1 for EHB, 0 is no extra half darkening
     unsigned  transparency; ///< TODO: transparency color index in palette
     unsigned  masking;      ///< TODO: masking method used

     int init; // 1 if buffer and palette data already initialized, 0 otherwise

 } IffContext;

 #define LUT8_PART(plane, v)                             \

     AV_LE2NE64C(UINT64_C(0x0000000)<<32 | v) << plane,  \
     AV_LE2NE64C(UINT64_C(0x1000000)<<32 | v) << plane,  \
     AV_LE2NE64C(UINT64_C(0x0010000)<<32 | v) << plane,  \
     AV_LE2NE64C(UINT64_C(0x1010000)<<32 | v) << plane,  \
     AV_LE2NE64C(UINT64_C(0x0000100)<<32 | v) << plane,  \
     AV_LE2NE64C(UINT64_C(0x1000100)<<32 | v) << plane,  \
     AV_LE2NE64C(UINT64_C(0x0010100)<<32 | v) << plane,  \
     AV_LE2NE64C(UINT64_C(0x1010100)<<32 | v) << plane,  \
     AV_LE2NE64C(UINT64_C(0x0000001)<<32 | v) << plane,  \
     AV_LE2NE64C(UINT64_C(0x1000001)<<32 | v) << plane,  \
     AV_LE2NE64C(UINT64_C(0x0010001)<<32 | v) << plane,  \
     AV_LE2NE64C(UINT64_C(0x1010001)<<32 | v) << plane,  \
     AV_LE2NE64C(UINT64_C(0x0000101)<<32 | v) << plane,  \
     AV_LE2NE64C(UINT64_C(0x1000101)<<32 | v) << plane,  \
     AV_LE2NE64C(UINT64_C(0x0010101)<<32 | v) << plane,  \
     AV_LE2NE64C(UINT64_C(0x1010101)<<32 | v) << plane

 
 #define LUT8(plane) {                           \
     LUT8_PART(plane, 0x0000000),                \
     LUT8_PART(plane, 0x1000000),                \
     LUT8_PART(plane, 0x0010000),                \
     LUT8_PART(plane, 0x1010000),                \
     LUT8_PART(plane, 0x0000100),                \
     LUT8_PART(plane, 0x1000100),                \
     LUT8_PART(plane, 0x0010100),                \
     LUT8_PART(plane, 0x1010100),                \
     LUT8_PART(plane, 0x0000001),                \
     LUT8_PART(plane, 0x1000001),                \
     LUT8_PART(plane, 0x0010001),                \
     LUT8_PART(plane, 0x1010001),                \
     LUT8_PART(plane, 0x0000101),                \
     LUT8_PART(plane, 0x1000101),                \
     LUT8_PART(plane, 0x0010101),                \
     LUT8_PART(plane, 0x1010101),                \
 }
 
 // 8 planes * 8-bit mask
 static const uint64_t plane8_lut[8][256] = {
     LUT8(0), LUT8(1), LUT8(2), LUT8(3),
     LUT8(4), LUT8(5), LUT8(6), LUT8(7),
 };
 

 #define LUT32(plane) {                                \
              0,          0,          0,          0,   \
              0,          0,          0, 1 << plane,   \
              0,          0, 1 << plane,          0,   \
              0,          0, 1 << plane, 1 << plane,   \
              0, 1 << plane,          0,          0,   \
              0, 1 << plane,          0, 1 << plane,   \
              0, 1 << plane, 1 << plane,          0,   \
              0, 1 << plane, 1 << plane, 1 << plane,   \
     1 << plane,          0,          0,          0,   \
     1 << plane,          0,          0, 1 << plane,   \
     1 << plane,          0, 1 << plane,          0,   \
     1 << plane,          0, 1 << plane, 1 << plane,   \
     1 << plane, 1 << plane,          0,          0,   \
     1 << plane, 1 << plane,          0, 1 << plane,   \
     1 << plane, 1 << plane, 1 << plane,          0,   \
     1 << plane, 1 << plane, 1 << plane, 1 << plane,   \
 }
 
 // 32 planes * 4-bit mask * 4 lookup tables each
 static const uint32_t plane32_lut[32][16*4] = {
     LUT32( 0), LUT32( 1), LUT32( 2), LUT32( 3),
     LUT32( 4), LUT32( 5), LUT32( 6), LUT32( 7),
     LUT32( 8), LUT32( 9), LUT32(10), LUT32(11),
     LUT32(12), LUT32(13), LUT32(14), LUT32(15),
     LUT32(16), LUT32(17), LUT32(18), LUT32(19),
     LUT32(20), LUT32(21), LUT32(22), LUT32(23),
     LUT32(24), LUT32(25), LUT32(26), LUT32(27),
     LUT32(28), LUT32(29), LUT32(30), LUT32(31),
 };
 

 // Gray to RGB, required for palette table of grayscale images with bpp < 8
 static av_always_inline uint32_t gray2rgb(const uint32_t x) {
     return x << 16 | x << 8 | x;
 }
 

 /**
  * Convert CMAP buffer (stored in extradata) to lavc palette format
  */

 static int ff_cmap_read_palette(AVCodecContext *avctx, uint32_t *pal)

 {

     int count, i;

     const uint8_t *const palette = avctx->extradata + AV_RB16(avctx->extradata);

     int palette_size = avctx->extradata_size - AV_RB16(avctx->extradata);

 
     if (avctx->bits_per_coded_sample > 8) {
         av_log(avctx, AV_LOG_ERROR, "bit_per_coded_sample > 8 not supported\n");
         return AVERROR_INVALIDDATA;
     }
 
     count = 1 << avctx->bits_per_coded_sample;

     // If extradata is smaller than actually needed, fill the remaining with black.

     count = FFMIN(palette_size / 3, count);

     if (count) {

         for (i=0; i < count; i++) {

             pal[i] = 0xFF000000 | AV_RB24(palette + i*3);

         }

     } else { // Create gray-scale color palette for bps < 8
         count = 1 << avctx->bits_per_coded_sample;
 
         for (i=0; i < count; i++) {
             pal[i] = 0xFF000000 | gray2rgb((i * 255) >> avctx->bits_per_coded_sample);
         }
     }

     return 0;
 }
 

 /**
  * Extracts the IFF extra context and updates internal
  * decoder structures.
  *
  * @param avctx the AVCodecContext where to extract extra context to
  * @param avpkt the AVPacket to extract extra context from or NULL to use avctx
  * @return 0 in case of success, a negative error code otherwise
  */
 static int extract_header(AVCodecContext *const avctx,
                           const AVPacket *const avpkt) {
     const uint8_t *buf;
     unsigned buf_size;
     IffContext *s = avctx->priv_data;

     int palette_size = avctx->extradata_size - AV_RB16(avctx->extradata);
 

     if (avpkt) {

         int image_size;

         if (avpkt->size < 2)
             return AVERROR_INVALIDDATA;

         image_size = avpkt->size - AV_RB16(avpkt->data);

         buf = avpkt->data;
         buf_size = bytestream_get_be16(&buf);

         if (buf_size <= 1 || image_size <= 1) {

             av_log(avctx, AV_LOG_ERROR,
                    "Invalid image size received: %u -> image data offset: %d\n",

                    buf_size, image_size);

             return AVERROR_INVALIDDATA;
         }
     } else {
         if (avctx->extradata_size < 2)
             return AVERROR_INVALIDDATA;
         buf = avctx->extradata;
         buf_size = bytestream_get_be16(&buf);

         if (buf_size <= 1 || palette_size < 0) {

             av_log(avctx, AV_LOG_ERROR,
                    "Invalid palette size received: %u -> palette data offset: %d\n",

                    buf_size, palette_size);

             return AVERROR_INVALIDDATA;
         }
     }
 
     if (buf_size > 8) {
         s->compression  = bytestream_get_byte(&buf);
         s->bpp          = bytestream_get_byte(&buf);
         s->ham          = bytestream_get_byte(&buf);
         s->flags        = bytestream_get_byte(&buf);
         s->transparency = bytestream_get_be16(&buf);
         s->masking      = bytestream_get_byte(&buf);
         if (s->masking == MASK_HAS_TRANSPARENT_COLOR) {
             av_log(avctx, AV_LOG_ERROR, "Transparency not supported\n");
             return AVERROR_PATCHWELCOME;
         } else if (s->masking != MASK_NONE) {
             av_log(avctx, AV_LOG_ERROR, "Masking not supported\n");
             return AVERROR_PATCHWELCOME;
         }
         if (!s->bpp || s->bpp > 32) {
             av_log(avctx, AV_LOG_ERROR, "Invalid number of bitplanes: %u\n", s->bpp);
             return AVERROR_INVALIDDATA;
         } else if (s->ham >= 8) {
             av_log(avctx, AV_LOG_ERROR, "Invalid number of hold bits for HAM: %u\n", s->ham);
             return AVERROR_INVALIDDATA;
         }
 
         av_freep(&s->ham_buf);
         av_freep(&s->ham_palbuf);
 
         if (s->ham) {

             int i, count = FFMIN(palette_size / 3, 1 << s->ham);

             const uint8_t *const palette = avctx->extradata + AV_RB16(avctx->extradata);

             s->ham_buf = av_malloc((s->planesize * 8) + FF_INPUT_BUFFER_PADDING_SIZE);
             if (!s->ham_buf)
                 return AVERROR(ENOMEM);
 
             s->ham_palbuf = av_malloc((8 * (1 << s->ham) * sizeof (uint32_t)) + FF_INPUT_BUFFER_PADDING_SIZE);
             if (!s->ham_palbuf) {
                 av_freep(&s->ham_buf);
                 return AVERROR(ENOMEM);
             }
 
             if (count) { // HAM with color palette attached
                 // prefill with black and palette and set HAM take direct value mask to zero
                 memset(s->ham_palbuf, 0, (1 << s->ham) * 2 * sizeof (uint32_t));
                 for (i=0; i < count; i++) {

                     s->ham_palbuf[i*2+1] = AV_RL24(palette + i*3);

                 }
                 count = 1 << s->ham;
             } else { // HAM with grayscale color palette
                 count = 1 << s->ham;
                 for (i=0; i < count; i++) {
                     s->ham_palbuf[i*2]   = 0; // take direct color value from palette
                     s->ham_palbuf[i*2+1] = av_le2ne32(gray2rgb((i * 255) >> s->ham));
                 }
             }
             for (i=0; i < count; i++) {
                 uint32_t tmp = i << (8 - s->ham);
                 tmp |= tmp >> s->ham;
                 s->ham_palbuf[(i+count)*2]     = 0x00FFFF; // just modify blue color component
                 s->ham_palbuf[(i+count*2)*2]   = 0xFFFF00; // just modify red color component
                 s->ham_palbuf[(i+count*3)*2]   = 0xFF00FF; // just modify green color component
                 s->ham_palbuf[(i+count)*2+1]   = tmp << 16;
                 s->ham_palbuf[(i+count*2)*2+1] = tmp;
                 s->ham_palbuf[(i+count*3)*2+1] = tmp << 8;
             }
         } else if (s->flags & 1) { // EHB (ExtraHalfBrite) color palette
             av_log(avctx, AV_LOG_ERROR, "ExtraHalfBrite (EHB) mode not supported\n");
             return AVERROR_PATCHWELCOME;
         }
     }
 
     return 0;
 }
 

 static av_cold int decode_init(AVCodecContext *avctx)
 {

     IffContext *s = avctx->priv_data;

     int err;

 
     if (avctx->bits_per_coded_sample <= 8) {

         int palette_size = avctx->extradata_size - AV_RB16(avctx->extradata);

         avctx->pix_fmt = (avctx->bits_per_coded_sample < 8) ||

                          (avctx->extradata_size >= 2 && palette_size) ? PIX_FMT_PAL8 : PIX_FMT_GRAY8;

     } else if (avctx->bits_per_coded_sample <= 32) {
         avctx->pix_fmt = PIX_FMT_BGR32;
     } else {
         return AVERROR_INVALIDDATA;
     }

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

         return err;

     s->planesize = FFALIGN(avctx->width, 16) >> 3; // Align plane size in bits to word-boundary

     s->planebuf = av_malloc(s->planesize + FF_INPUT_BUFFER_PADDING_SIZE);
     if (!s->planebuf)
         return AVERROR(ENOMEM);

     s->bpp = avctx->bits_per_coded_sample;

     avcodec_get_frame_defaults(&s->frame);

 
     if ((err = extract_header(avctx, NULL)) < 0)
         return err;

     s->frame.reference = 1;

     return 0;

 }
 
 /**

  * Decode interleaved plane buffer up to 8bpp
  * @param dst Destination buffer
  * @param buf Source buffer
  * @param buf_size
  * @param plane plane number to decode as
  */

 static void decodeplane8(uint8_t *dst, const uint8_t *buf, int buf_size, int plane)

 {

     const uint64_t *lut = plane8_lut[plane];

     do {

         uint64_t v = AV_RN64A(dst) | lut[*buf++];
         AV_WN64A(dst, v);

         dst += 8;

     } while (--buf_size);

 }
 
 /**
  * Decode interleaved plane buffer up to 24bpp

  * @param dst Destination buffer
  * @param buf Source buffer
  * @param buf_size
  * @param plane plane number to decode as

  */

 static void decodeplane32(uint32_t *dst, const uint8_t *buf, int buf_size, int plane)

 {

     const uint32_t *lut = plane32_lut[plane];
     do {
         unsigned mask = (*buf >> 2) & ~3;
         dst[0] |= lut[mask++];
         dst[1] |= lut[mask++];
         dst[2] |= lut[mask++];
         dst[3] |= lut[mask];
         mask = (*buf++ << 2) & 0x3F;
         dst[4] |= lut[mask++];
         dst[5] |= lut[mask++];
         dst[6] |= lut[mask++];
         dst[7] |= lut[mask];
         dst += 8;
     } while (--buf_size);

 }
 

 #define DECODE_HAM_PLANE32(x)       \
     first       = buf[x] << 1;      \
     second      = buf[(x)+1] << 1;  \
     delta      &= pal[first++];     \
     delta      |= pal[first];       \
     dst[x]      = delta;            \
     delta      &= pal[second++];    \
     delta      |= pal[second];      \
     dst[(x)+1]  = delta
 
 /**
  * Converts one line of HAM6/8-encoded chunky buffer to 24bpp.
  *
  * @param dst the destination 24bpp buffer
  * @param buf the source 8bpp chunky buffer
  * @param pal the HAM decode table
  * @param buf_size the plane size in bytes
  */
 static void decode_ham_plane32(uint32_t *dst, const uint8_t  *buf,
                                const uint32_t *const pal, unsigned buf_size)
 {
     uint32_t delta = 0;
     do {
         uint32_t first, second;
         DECODE_HAM_PLANE32(0);
         DECODE_HAM_PLANE32(2);
         DECODE_HAM_PLANE32(4);
         DECODE_HAM_PLANE32(6);
         buf += 8;
         dst += 8;
     } while (--buf_size);
 }
 

 /**

  * Decode one complete byterun1 encoded line.

  *
  * @param dst the destination buffer where to store decompressed bitstream
  * @param dst_size the destination plane size in bytes
  * @param buf the source byterun1 compressed bitstream
  * @param buf_end the EOF of source byterun1 compressed bitstream
  * @return number of consumed bytes in byterun1 compressed bitstream
 */
 static int decode_byterun(uint8_t *dst, int dst_size,
                           const uint8_t *buf, const uint8_t *const buf_end) {
     const uint8_t *const buf_start = buf;
     unsigned x;
     for (x = 0; x < dst_size && buf < buf_end;) {
         unsigned length;
         const int8_t value = *buf++;
         if (value >= 0) {
             length = value + 1;
             memcpy(dst + x, buf, FFMIN3(length, dst_size - x, buf_end - buf));
             buf += length;
         } else if (value > -128) {
             length = -value + 1;
             memset(dst + x, *buf++, FFMIN(length, dst_size - x));
         } else { // noop
             continue;
         }
         x += length;
     }
     return buf - buf_start;
 }
 

 static int decode_frame_ilbm(AVCodecContext *avctx,
                             void *data, int *data_size,
                             AVPacket *avpkt)
 {

     IffContext *s = avctx->priv_data;

     const uint8_t *buf = avpkt->size >= 2 ? avpkt->data + AV_RB16(avpkt->data) : NULL;
     const int buf_size = avpkt->size >= 2 ? avpkt->size - AV_RB16(avpkt->data) : 0;

     const uint8_t *buf_end = buf+buf_size;

     int y, plane, res;

     if ((res = extract_header(avctx, avpkt)) < 0)
         return res;
 

     if (s->init) {
         if ((res = avctx->reget_buffer(avctx, &s->frame)) < 0) {
             av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
             return res;
         }
     } else if ((res = avctx->get_buffer(avctx, &s->frame)) < 0) {

         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");

         return res;
     } else if (avctx->bits_per_coded_sample <= 8 && avctx->pix_fmt != PIX_FMT_GRAY8) {
         if ((res = ff_cmap_read_palette(avctx, (uint32_t*)s->frame.data[1])) < 0)
             return res;

     }

     s->init = 1;

     if (avctx->codec_tag == MKTAG('I','L','B','M')) { // interleaved

         if (avctx->pix_fmt == PIX_FMT_PAL8 || avctx->pix_fmt == PIX_FMT_GRAY8) {

             for(y = 0; y < avctx->height; y++ ) {
                 uint8_t *row = &s->frame.data[0][ y*s->frame.linesize[0] ];
                 memset(row, 0, avctx->width);

                 for (plane = 0; plane < s->bpp && buf < buf_end; plane++) {

                     decodeplane8(row, buf, FFMIN(s->planesize, buf_end - buf), plane);
                     buf += s->planesize;
                 }

             }

         } else if (s->ham) { // HAM to PIX_FMT_BGR32
             for (y = 0; y < avctx->height; y++) {
                 uint8_t *row = &s->frame.data[0][ y*s->frame.linesize[0] ];
                 memset(s->ham_buf, 0, avctx->width);
                 for (plane = 0; plane < s->bpp && buf < buf_end; plane++) {
                     decodeplane8(s->ham_buf, buf, FFMIN(s->planesize, buf_end - buf), plane);
                     buf += s->planesize;
                 }
                 decode_ham_plane32((uint32_t *) row, s->ham_buf, s->ham_palbuf, s->planesize);
             }

         } else { // PIX_FMT_BGR32
             for(y = 0; y < avctx->height; y++ ) {
                 uint8_t *row = &s->frame.data[0][y*s->frame.linesize[0]];
                 memset(row, 0, avctx->width << 2);

                 for (plane = 0; plane < s->bpp && buf < buf_end; plane++) {

                     decodeplane32((uint32_t *) row, buf, FFMIN(s->planesize, buf_end - buf), plane);
                     buf += s->planesize;
                 }

             }

         }

     } else if (avctx->pix_fmt == PIX_FMT_PAL8 || avctx->pix_fmt == PIX_FMT_GRAY8) { // IFF-PBM

         for(y = 0; y < avctx->height; y++ ) {
             uint8_t *row = &s->frame.data[0][y * s->frame.linesize[0]];
             memcpy(row, buf, FFMIN(avctx->width, buf_end - buf));

             buf += avctx->width + (avctx->width % 2); // padding if odd

         }

     } else { // IFF-PBM: HAM to PIX_FMT_BGR32
         for (y = 0; y < avctx->height; y++) {
             uint8_t *row = &s->frame.data[0][ y*s->frame.linesize[0] ];
             memcpy(s->ham_buf, buf, FFMIN(avctx->width, buf_end - buf));
             buf += avctx->width + (avctx->width & 1); // padding if odd
             decode_ham_plane32((uint32_t *) row, s->ham_buf, s->ham_palbuf, avctx->width);
         }

     }

 
     *data_size = sizeof(AVFrame);

     *(AVFrame*)data = s->frame;

     return buf_size;
 }
 
 static int decode_frame_byterun1(AVCodecContext *avctx,
                             void *data, int *data_size,
                             AVPacket *avpkt)
 {

     IffContext *s = avctx->priv_data;

     const uint8_t *buf = avpkt->size >= 2 ? avpkt->data + AV_RB16(avpkt->data) : NULL;
     const int buf_size = avpkt->size >= 2 ? avpkt->size - AV_RB16(avpkt->data) : 0;

     const uint8_t *buf_end = buf+buf_size;

     int y, plane, res;

     if ((res = extract_header(avctx, avpkt)) < 0)
         return res;

     if (s->init) {
         if ((res = avctx->reget_buffer(avctx, &s->frame)) < 0) {
             av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
             return res;
         }
     } else if ((res = avctx->get_buffer(avctx, &s->frame)) < 0) {

         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");

         return res;
     } else if (avctx->bits_per_coded_sample <= 8 && avctx->pix_fmt != PIX_FMT_GRAY8) {
         if ((res = ff_cmap_read_palette(avctx, (uint32_t*)s->frame.data[1])) < 0)
             return res;

     }

     s->init = 1;

     if (avctx->codec_tag == MKTAG('I','L','B','M')) { //interleaved

         if (avctx->pix_fmt == PIX_FMT_PAL8 || avctx->pix_fmt == PIX_FMT_GRAY8) {

             for(y = 0; y < avctx->height ; y++ ) {
                 uint8_t *row = &s->frame.data[0][ y*s->frame.linesize[0] ];
                 memset(row, 0, avctx->width);

                 for (plane = 0; plane < s->bpp; plane++) {

                     buf += decode_byterun(s->planebuf, s->planesize, buf, buf_end);

                     decodeplane8(row, s->planebuf, s->planesize, plane);

                 }
             }

         } else if (s->ham) { // HAM to PIX_FMT_BGR32
             for (y = 0; y < avctx->height ; y++) {
                 uint8_t *row = &s->frame.data[0][y*s->frame.linesize[0]];
                 memset(s->ham_buf, 0, avctx->width);
                 for (plane = 0; plane < s->bpp; plane++) {
                     buf += decode_byterun(s->planebuf, s->planesize, buf, buf_end);
                     decodeplane8(s->ham_buf, s->planebuf, s->planesize, plane);
                 }
                 decode_ham_plane32((uint32_t *) row, s->ham_buf, s->ham_palbuf, s->planesize);
             }

         } else { //PIX_FMT_BGR32

             for(y = 0; y < avctx->height ; y++ ) {
                 uint8_t *row = &s->frame.data[0][y*s->frame.linesize[0]];
                 memset(row, 0, avctx->width << 2);

                 for (plane = 0; plane < s->bpp; plane++) {

                     buf += decode_byterun(s->planebuf, s->planesize, buf, buf_end);

                     decodeplane32((uint32_t *) row, s->planebuf, s->planesize, plane);

                 }

             }

         }

     } else if (avctx->pix_fmt == PIX_FMT_PAL8 || avctx->pix_fmt == PIX_FMT_GRAY8) { // IFF-PBM

         for(y = 0; y < avctx->height ; y++ ) {
             uint8_t *row = &s->frame.data[0][y*s->frame.linesize[0]];

             buf += decode_byterun(row, avctx->width, buf, buf_end);

         }

     } else { // IFF-PBM: HAM to PIX_FMT_BGR32
         for (y = 0; y < avctx->height ; y++) {
             uint8_t *row = &s->frame.data[0][y*s->frame.linesize[0]];
             buf += decode_byterun(s->ham_buf, avctx->width, buf, buf_end);
             decode_ham_plane32((uint32_t *) row, s->ham_buf, s->ham_palbuf, avctx->width);
         }

     }
 
     *data_size = sizeof(AVFrame);

     *(AVFrame*)data = s->frame;

     return buf_size;
 }
 
 static av_cold int decode_end(AVCodecContext *avctx)
 {

     IffContext *s = avctx->priv_data;
     if (s->frame.data[0])
         avctx->release_buffer(avctx, &s->frame);
     av_freep(&s->planebuf);

     av_freep(&s->ham_buf);
     av_freep(&s->ham_palbuf);

     return 0;
 }
 

 AVCodec ff_iff_ilbm_decoder = {

     "iff_ilbm",

     AVMEDIA_TYPE_VIDEO,

     CODEC_ID_IFF_ILBM,

     sizeof(IffContext),

     decode_init,
     NULL,
     decode_end,
     decode_frame_ilbm,
     CODEC_CAP_DR1,
     .long_name = NULL_IF_CONFIG_SMALL("IFF ILBM"),
 };
 

 AVCodec ff_iff_byterun1_decoder = {

     "iff_byterun1",

     AVMEDIA_TYPE_VIDEO,

     CODEC_ID_IFF_BYTERUN1,

     sizeof(IffContext),

     decode_init,
     NULL,
     decode_end,
     decode_frame_byterun1,
     CODEC_CAP_DR1,
     .long_name = NULL_IF_CONFIG_SMALL("IFF ByteRun1"),
 };