00001
00002
00003
00004
00005
00006
00007
00008
00009
00010
00011
00012
00013
00014
00015
00016
00017
00018
00019
00020
00021
00022
00023
00024
00025 #include "avcodec.h"
00026 #include "bytestream.h"
00027
00029 #define MAX_RLE_BULK 127
00030
00031 #define MAX_RLE_REPEAT 128
00032
00033 #define MAX_RLE_SKIP 254
00034
00035 typedef struct QtrleEncContext {
00036 AVCodecContext *avctx;
00037 AVFrame frame;
00038 int pixel_size;
00039 AVPicture previous_frame;
00040 unsigned int max_buf_size;
00050 signed char *rlecode_table;
00054 int *length_table;
00058 uint8_t* skip_table;
00059 } QtrleEncContext;
00060
00061 static av_cold int qtrle_encode_init(AVCodecContext *avctx)
00062 {
00063 QtrleEncContext *s = avctx->priv_data;
00064
00065 if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) {
00066 return -1;
00067 }
00068 s->avctx=avctx;
00069
00070 switch (avctx->pix_fmt) {
00071
00072
00073
00074 case PIX_FMT_RGB24:
00075 s->pixel_size = 3;
00076 break;
00077 default:
00078 av_log(avctx, AV_LOG_ERROR, "Unsupported colorspace.\n");
00079 break;
00080 }
00081 avctx->bits_per_coded_sample = s->pixel_size*8;
00082
00083 s->rlecode_table = av_mallocz(s->avctx->width);
00084 s->skip_table = av_mallocz(s->avctx->width);
00085 s->length_table = av_mallocz((s->avctx->width + 1)*sizeof(int));
00086 if (!s->skip_table || !s->length_table || !s->rlecode_table) {
00087 av_log(avctx, AV_LOG_ERROR, "Error allocating memory.\n");
00088 return -1;
00089 }
00090 if (avpicture_alloc(&s->previous_frame, avctx->pix_fmt, avctx->width, avctx->height) < 0) {
00091 av_log(avctx, AV_LOG_ERROR, "Error allocating picture\n");
00092 return -1;
00093 }
00094
00095 s->max_buf_size = s->avctx->width*s->avctx->height*s->pixel_size
00096 + 15
00097 + s->avctx->height*2
00098 + s->avctx->width/MAX_RLE_BULK + 1 ;
00099 avctx->coded_frame = &s->frame;
00100 return 0;
00101 }
00102
00106 static void qtrle_encode_line(QtrleEncContext *s, AVFrame *p, int line, uint8_t **buf)
00107 {
00108 int width=s->avctx->width;
00109 int i;
00110 signed char rlecode;
00111
00112
00113 unsigned int bulkcount;
00114
00115
00116 unsigned int skipcount;
00117
00118
00119 unsigned int av_uninit(repeatcount);
00120
00121
00122 int total_bulk_cost;
00123 int total_skip_cost;
00124 int total_repeat_cost;
00125
00126 int temp_cost;
00127 int j;
00128
00129 uint8_t *this_line = p-> data[0] + line*p-> linesize[0] +
00130 (width - 1)*s->pixel_size;
00131 uint8_t *prev_line = s->previous_frame.data[0] + line*s->previous_frame.linesize[0] +
00132 (width - 1)*s->pixel_size;
00133
00134 s->length_table[width] = 0;
00135 skipcount = 0;
00136
00137 for (i = width - 1; i >= 0; i--) {
00138
00139 if (!s->frame.key_frame && !memcmp(this_line, prev_line, s->pixel_size))
00140 skipcount = FFMIN(skipcount + 1, MAX_RLE_SKIP);
00141 else
00142 skipcount = 0;
00143
00144 total_skip_cost = s->length_table[i + skipcount] + 2;
00145 s->skip_table[i] = skipcount;
00146
00147
00148 if (i < width - 1 && !memcmp(this_line, this_line + s->pixel_size, s->pixel_size))
00149 repeatcount = FFMIN(repeatcount + 1, MAX_RLE_REPEAT);
00150 else
00151 repeatcount = 1;
00152
00153 total_repeat_cost = s->length_table[i + repeatcount] + 1 + s->pixel_size;
00154
00155
00156
00157 if (i == 0) {
00158 total_skip_cost--;
00159 total_repeat_cost++;
00160 }
00161
00162 if (repeatcount > 1 && (skipcount == 0 || total_repeat_cost < total_skip_cost)) {
00163
00164 s->length_table[i] = total_repeat_cost;
00165 s->rlecode_table[i] = -repeatcount;
00166 }
00167 else if (skipcount > 0) {
00168
00169 s->length_table[i] = total_skip_cost;
00170 s->rlecode_table[i] = 0;
00171 }
00172 else {
00173
00174
00175
00176 int limit = FFMIN(width - i, MAX_RLE_BULK);
00177
00178 temp_cost = 1 + s->pixel_size + !i;
00179 total_bulk_cost = INT_MAX;
00180
00181 for (j = 1; j <= limit; j++) {
00182 if (s->length_table[i + j] + temp_cost < total_bulk_cost) {
00183
00184 total_bulk_cost = s->length_table[i + j] + temp_cost;
00185 bulkcount = j;
00186 }
00187 temp_cost += s->pixel_size;
00188 }
00189
00190 s->length_table[i] = total_bulk_cost;
00191 s->rlecode_table[i] = bulkcount;
00192 }
00193
00194 this_line -= s->pixel_size;
00195 prev_line -= s->pixel_size;
00196 }
00197
00198
00199
00200
00201
00202
00203 i=0;
00204 this_line = p-> data[0] + line*p->linesize[0];
00205 prev_line = s->previous_frame.data[0] + line*p->linesize[0];
00206
00207 if (s->rlecode_table[0] == 0) {
00208 bytestream_put_byte(buf, s->skip_table[0] + 1);
00209 i += s->skip_table[0];
00210 }
00211 else bytestream_put_byte(buf, 1);
00212
00213
00214 while (i < width) {
00215 rlecode = s->rlecode_table[i];
00216 bytestream_put_byte(buf, rlecode);
00217 if (rlecode == 0) {
00218
00219 bytestream_put_byte(buf, s->skip_table[i] + 1);
00220 i += s->skip_table[i];
00221 }
00222 else if (rlecode > 0) {
00223
00224 bytestream_put_buffer(buf, this_line + i*s->pixel_size, rlecode*s->pixel_size);
00225 i += rlecode;
00226 }
00227 else {
00228
00229 bytestream_put_buffer(buf, this_line + i*s->pixel_size, s->pixel_size);
00230 i -= rlecode;
00231 }
00232 }
00233 bytestream_put_byte(buf, -1);
00234 }
00235
00237 static int encode_frame(QtrleEncContext *s, AVFrame *p, uint8_t *buf)
00238 {
00239 int i;
00240 int start_line = 0;
00241 int end_line = s->avctx->height;
00242 uint8_t *orig_buf = buf;
00243
00244 if (!s->frame.key_frame) {
00245 unsigned line_size = s->avctx->width * s->pixel_size;
00246 for (start_line = 0; start_line < s->avctx->height; start_line++)
00247 if (memcmp(p->data[0] + start_line*p->linesize[0],
00248 s->previous_frame.data[0] + start_line*s->previous_frame.linesize[0],
00249 line_size))
00250 break;
00251
00252 for (end_line=s->avctx->height; end_line > start_line; end_line--)
00253 if (memcmp(p->data[0] + (end_line - 1)*p->linesize[0],
00254 s->previous_frame.data[0] + (end_line - 1)*s->previous_frame.linesize[0],
00255 line_size))
00256 break;
00257 }
00258
00259 bytestream_put_be32(&buf, 0);
00260
00261 if ((start_line == 0 && end_line == s->avctx->height) || start_line == s->avctx->height)
00262 bytestream_put_be16(&buf, 0);
00263 else {
00264 bytestream_put_be16(&buf, 8);
00265 bytestream_put_be16(&buf, start_line);
00266 bytestream_put_be16(&buf, 0);
00267 bytestream_put_be16(&buf, end_line - start_line);
00268 bytestream_put_be16(&buf, 0);
00269 }
00270 for (i = start_line; i < end_line; i++)
00271 qtrle_encode_line(s, p, i, &buf);
00272
00273 bytestream_put_byte(&buf, 0);
00274 AV_WB32(orig_buf, buf - orig_buf);
00275 return buf - orig_buf;
00276 }
00277
00278 static int qtrle_encode_frame(AVCodecContext *avctx, uint8_t *buf, int buf_size, void *data)
00279 {
00280 QtrleEncContext * const s = avctx->priv_data;
00281 AVFrame *pict = data;
00282 AVFrame * const p = &s->frame;
00283 int chunksize;
00284
00285 *p = *pict;
00286
00287 if (buf_size < s->max_buf_size) {
00288
00289 av_log(avctx, AV_LOG_ERROR, "buf_size %d < %d\n", buf_size, s->max_buf_size);
00290 return -1;
00291 }
00292
00293 if (avctx->gop_size == 0 || (s->avctx->frame_number % avctx->gop_size) == 0) {
00294
00295 p->pict_type = FF_I_TYPE;
00296 p->key_frame = 1;
00297 } else {
00298
00299 p->pict_type = FF_P_TYPE;
00300 p->key_frame = 0;
00301 }
00302
00303 chunksize = encode_frame(s, pict, buf);
00304
00305
00306 av_picture_copy(&s->previous_frame, (AVPicture *)p, avctx->pix_fmt, avctx->width, avctx->height);
00307 return chunksize;
00308 }
00309
00310 static av_cold int qtrle_encode_end(AVCodecContext *avctx)
00311 {
00312 QtrleEncContext *s = avctx->priv_data;
00313
00314 avpicture_free(&s->previous_frame);
00315 av_free(s->rlecode_table);
00316 av_free(s->length_table);
00317 av_free(s->skip_table);
00318 return 0;
00319 }
00320
00321 AVCodec qtrle_encoder = {
00322 "qtrle",
00323 CODEC_TYPE_VIDEO,
00324 CODEC_ID_QTRLE,
00325 sizeof(QtrleEncContext),
00326 qtrle_encode_init,
00327 qtrle_encode_frame,
00328 qtrle_encode_end,
00329 .pix_fmts = (enum PixelFormat[]){PIX_FMT_RGB24, PIX_FMT_NONE},
00330 .long_name = NULL_IF_CONFIG_SMALL("QuickTime Animation (RLE) video"),
00331 };