quicktime/qtpng.c

   1 #include "colormodels.h"
   2 #include "funcprotos.h"
   3 #include <png.h>
   4 #include "quicktime.h"
   5 #include "qtpng.h"
   6
   7 typedef struct
   8 {
   9         int compression_level;
  10         unsigned char *buffer;
  11 // Read position
  12         long buffer_position;
  13 // Frame size
  14         long buffer_size;
  15 // Buffer allocation
  16         long buffer_allocated;
  17         int quality;
  18         unsigned char *temp_frame;
  19 } quicktime_png_codec_t;
  20
  21 static int delete_codec(quicktime_video_map_t *vtrack)
  22 {
  23         quicktime_png_codec_t *codec = ((quicktime_codec_t*)vtrack->codec)->priv;
  24         if(codec->buffer) free(codec->buffer);
  25         if(codec->temp_frame) free(codec->temp_frame);
  26         free(codec);
  27         return 0;
  28 }
  29
  30 static int source_cmodel(quicktime_t *file, int track)
  31 {
  32         int depth = quicktime_video_depth(file, track);
  33         if(depth == 24)
  34                 return BC_RGB888;
  35         else
  36                 return BC_RGBA8888;
  37 }
  38
  39 void quicktime_set_png(quicktime_t *file, int compression_level)
  40 {
  41         int i;
  42         char *compressor;
  43
  44         for(i = 0; i < file->total_vtracks; i++)
  45         {
  46                 if(quicktime_match_32(quicktime_video_compressor(file, i), QUICKTIME_PNG))
  47                 {
  48                         quicktime_png_codec_t *codec = ((quicktime_codec_t*)file->vtracks[i].codec)->priv;
  49                         codec->compression_level = compression_level;
  50                 }
  51         }
  52 }
  53
  54 static void read_function(png_structp png_ptr, png_bytep data, png_uint_32 length)
  55 {
  56         quicktime_png_codec_t *codec = png_get_io_ptr(png_ptr);
  57
  58         if(length + codec->buffer_position <= codec->buffer_size)
  59         {
  60                 memcpy(data, codec->buffer + codec->buffer_position, length);
  61                 codec->buffer_position += length;
  62         }
  63 }
  64
  65 static void write_function(png_structp png_ptr, png_bytep data, png_uint_32 length)
  66 {
  67         quicktime_png_codec_t *codec = png_get_io_ptr(png_ptr);
  68
  69         if(length + codec->buffer_size > codec->buffer_allocated)
  70         {
  71                 codec->buffer_allocated += length;
  72                 codec->buffer = realloc(codec->buffer, codec->buffer_allocated);
  73         }
  74         memcpy(codec->buffer + codec->buffer_size, data, length);
  75         codec->buffer_size += length;
  76 }
  77
  78 static void flush_function(png_structp png_ptr)
  79 {
  80         ;
  81 }
  82
  83 static int decode(quicktime_t *file, unsigned char **row_pointers, int track)
  84 {
  85         int result = 0;
  86         int64_t i;
  87         quicktime_video_map_t *vtrack = &(file->vtracks[track]);
  88         quicktime_trak_t *trak = vtrack->track;
  89         png_structp png_ptr;
  90         png_infop info_ptr;
  91         png_infop end_info = 0;
  92         int height = trak->tkhd.track_height;
  93         int width = trak->tkhd.track_width;
  94         quicktime_png_codec_t *codec = ((quicktime_codec_t*)vtrack->codec)->priv;
  95         int cmodel = source_cmodel(file, track);
  96         int use_temp = (cmodel != file->color_model ||
  97                 file->in_x != 0 ||
  98                 file->in_y != 0 ||
  99                 file->in_w != width ||
 100                 file->in_h != height ||
 101                 file->out_w != width ||
 102                 file->out_h != height);
 103         unsigned char **temp_rows = malloc(sizeof(unsigned char*) * height);
 104
 105         if(use_temp)
 106         {
 107                 if(!codec->temp_frame)
 108                 {
 109                         codec->temp_frame = malloc(cmodel_calculate_datasize(width,
 110                                         height,
 111                                         -1,
 112                                         cmodel));
 113                 }
 114                 for(i = 0; i < height; i++)
 115                         temp_rows[i] = codec->temp_frame +
 116                                 cmodel_calculate_pixelsize(cmodel) * width * i;
 117         }
 118         else
 119         {
 120                 for(i = 0; i < height; i++)
 121                         temp_rows[i] = row_pointers[i];
 122         }
 123
 124         quicktime_set_video_position(file, vtrack->current_position, track);
 125         codec->buffer_size = quicktime_frame_size(file, vtrack->current_position, track);
 126         codec->buffer_position = 0;
 127         if(codec->buffer_size > codec->buffer_allocated)
 128         {
 129                 codec->buffer_allocated = codec->buffer_size;
 130                 codec->buffer = realloc(codec->buffer, codec->buffer_allocated);
 131         }
 132
 133         result = !quicktime_read_data(file, codec->buffer, codec->buffer_size);
 134
 135         if(!result)
 136         {
 137                 png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, 0, 0, 0);
 138                 info_ptr = png_create_info_struct(png_ptr);
 139                 png_set_read_fn(png_ptr, codec, (png_rw_ptr)read_function);
 140                 png_read_info(png_ptr, info_ptr);
 141
 142 /* read the image */
 143                 png_read_image(png_ptr, temp_rows);
 144                 png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
 145         }
 146
 147         if(use_temp)
 148         {
 149                 cmodel_transfer(row_pointers,
 150                         temp_rows,
 151                         row_pointers[0],
 152                         row_pointers[1],
 153                         row_pointers[2],
 154                         0,
 155                         0,
 156                         0,
 157                         file->in_x,
 158                         file->in_y,
 159                         file->in_w,
 160                         file->in_h,
 161                         0,
 162                         0,
 163                         file->out_w,
 164                         file->out_h,
 165                         cmodel,
 166                         file->color_model,
 167                         0,
 168                         width,
 169                         file->out_w);
 170         }
 171
 172
 173         free(temp_rows);
 174
 175         return result;
 176 }
 177
 178
 179
 180
 181 static int encode(quicktime_t *file, unsigned char **row_pointers, int track)
 182 {
 183         int64_t offset = quicktime_position(file);
 184         int result = 0;
 185         int i;
 186         quicktime_video_map_t *vtrack = &(file->vtracks[track]);
 187         quicktime_trak_t *trak = vtrack->track;
 188         quicktime_png_codec_t *codec = ((quicktime_codec_t*)vtrack->codec)->priv;
 189         int height = trak->tkhd.track_height;
 190         int width = trak->tkhd.track_width;
 191         png_structp png_ptr;
 192         png_infop info_ptr;
 193         int cmodel = source_cmodel(file, track);
 194         quicktime_atom_t chunk_atom;
 195
 196         codec->buffer_size = 0;
 197         codec->buffer_position = 0;
 198
 199         png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, 0, 0, 0);
 200         info_ptr = png_create_info_struct(png_ptr);
 201         png_set_write_fn(png_ptr,
 202                codec,
 203                            (png_rw_ptr)write_function,
 204                (png_flush_ptr)flush_function);
 205         png_set_compression_level(png_ptr, codec->compression_level);
 206         png_set_IHDR(png_ptr,
 207                 info_ptr,
 208                 width, height,
 209         8,
 210                 cmodel == BC_RGB888 ?
 211                   PNG_COLOR_TYPE_RGB :
 212                   PNG_COLOR_TYPE_RGB_ALPHA,
 213                 PNG_INTERLACE_NONE,
 214                 PNG_COMPRESSION_TYPE_DEFAULT,
 215                 PNG_FILTER_TYPE_DEFAULT);
 216         png_write_info(png_ptr, info_ptr);
 217         png_write_image(png_ptr, row_pointers);
 218         png_write_end(png_ptr, info_ptr);
 219         png_destroy_write_struct(&png_ptr, &info_ptr);
 220
 221         quicktime_write_chunk_header(file, trak, &chunk_atom);
 222         result = !quicktime_write_data(file,
 223                                 codec->buffer,
 224                                 codec->buffer_size);
 225         quicktime_write_chunk_footer(file,
 226                 trak,
 227                 vtrack->current_chunk,
 228                 &chunk_atom,
 229                 1);
 230
 231         vtrack->current_chunk++;
 232         return result;
 233 }
 234
 235 static int set_parameter(quicktime_t *file,
 236                 int track,
 237                 char *key,
 238                 void *value)
 239 {
 240         quicktime_video_map_t *vtrack = &(file->vtracks[track]);
 241         quicktime_codec_t *codec_base = (quicktime_codec_t*)vtrack->codec;
 242         quicktime_png_codec_t *codec = codec_base->priv;
 243
 244         if(!strcasecmp(key, "compression_level"))
 245                 codec->compression_level = *(int*)value;
 246 }
 247
 248 static int reads_colormodel(quicktime_t *file,
 249                 int colormodel,
 250                 int track)
 251 {
 252         return (colormodel == BC_RGB888 ||
 253                 colormodel == BC_BGR8888);
 254 }
 255
 256 void quicktime_init_codec_png(quicktime_video_map_t *vtrack)
 257 {
 258         quicktime_codec_t *codec_base = (quicktime_codec_t*)vtrack->codec;
 259         quicktime_png_codec_t *codec;
 260
 261 /* Init public items */
 262         codec_base->priv = calloc(1, sizeof(quicktime_png_codec_t));
 263         codec_base->delete_vcodec = delete_codec;
 264         codec_base->decode_video = decode;
 265         codec_base->encode_video = encode;
 266         codec_base->decode_audio = 0;
 267         codec_base->encode_audio = 0;
 268         codec_base->reads_colormodel = reads_colormodel;
 269         codec_base->set_parameter = set_parameter;
 270         codec_base->fourcc = QUICKTIME_PNG;
 271         codec_base->title = "PNG";
 272         codec_base->desc = "Lossless RGB compression";
 273
 274 /* Init private items */
 275         codec = codec_base->priv;
 276         codec->compression_level = 9;
 277 }