1/* 2 * Audio and Video frame extraction 3 * Copyright (c) 2003 Fabrice Bellard 4 * Copyright (c) 2003 Michael Niedermayer 5 * 6 * This file is part of FFmpeg. 7 * 8 * FFmpeg is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU Lesser General Public 10 * License as published by the Free Software Foundation; either 11 * version 2.1 of the License, or (at your option) any later version. 12 * 13 * FFmpeg is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * Lesser General Public License for more details. 17 * 18 * You should have received a copy of the GNU Lesser General Public 19 * License along with FFmpeg; if not, write to the Free Software 20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 21 */ 22 23#include "parser.h" 24 25static AVCodecParser *av_first_parser = NULL; 26 27AVCodecParser* av_parser_next(AVCodecParser *p){ 28 if(p) return p->next; 29 else return av_first_parser; 30} 31 32void av_register_codec_parser(AVCodecParser *parser) 33{ 34 parser->next = av_first_parser; 35 av_first_parser = parser; 36} 37 38AVCodecParserContext *av_parser_init(int codec_id) 39{ 40 AVCodecParserContext *s; 41 AVCodecParser *parser; 42 int ret; 43 44 if(codec_id == CODEC_ID_NONE) 45 return NULL; 46 47 for(parser = av_first_parser; parser != NULL; parser = parser->next) { 48 if (parser->codec_ids[0] == codec_id || 49 parser->codec_ids[1] == codec_id || 50 parser->codec_ids[2] == codec_id || 51 parser->codec_ids[3] == codec_id || 52 parser->codec_ids[4] == codec_id) 53 goto found; 54 } 55 return NULL; 56 found: 57 s = av_mallocz(sizeof(AVCodecParserContext)); 58 if (!s) 59 return NULL; 60 s->parser = parser; 61 s->priv_data = av_mallocz(parser->priv_data_size); 62 if (!s->priv_data) { 63 av_free(s); 64 return NULL; 65 } 66 if (parser->parser_init) { 67 ret = parser->parser_init(s); 68 if (ret != 0) { 69 av_free(s->priv_data); 70 av_free(s); 71 return NULL; 72 } 73 } 74 s->fetch_timestamp=1; 75 s->pict_type = FF_I_TYPE; 76 s->key_frame = -1; 77 s->convergence_duration = AV_NOPTS_VALUE; 78 s->dts_sync_point = INT_MIN; 79 s->dts_ref_dts_delta = INT_MIN; 80 s->pts_dts_delta = INT_MIN; 81 return s; 82} 83 84void ff_fetch_timestamp(AVCodecParserContext *s, int off, int remove){ 85 int i; 86 87 s->dts= s->pts= AV_NOPTS_VALUE; 88 s->pos= -1; 89 s->offset= 0; 90 for(i = 0; i < AV_PARSER_PTS_NB; i++) { 91 if ( s->cur_offset + off >= s->cur_frame_offset[i] 92 && (s->frame_offset < s->cur_frame_offset[i] || 93 (!s->frame_offset && !s->next_frame_offset)) // first field/frame 94 //check is disabled because mpeg-ts doesnt send complete PES packets 95 && /*s->next_frame_offset + off <*/ s->cur_frame_end[i]){ 96 s->dts= s->cur_frame_dts[i]; 97 s->pts= s->cur_frame_pts[i]; 98 s->pos= s->cur_frame_pos[i]; 99 s->offset = s->next_frame_offset - s->cur_frame_offset[i]; 100 if(remove) 101 s->cur_frame_offset[i]= INT64_MAX; 102 if(s->cur_offset + off < s->cur_frame_end[i]) 103 break; 104 } 105 } 106} 107 108/** 109 * 110 * @param buf input 111 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output) 112 * @param pts input presentation timestamp 113 * @param dts input decoding timestamp 114 * @param poutbuf will contain a pointer to the first byte of the output frame 115 * @param poutbuf_size will contain the length of the output frame 116 * @return the number of bytes of the input bitstream used 117 * 118 * Example: 119 * @code 120 * while(in_len){ 121 * len = av_parser_parse(myparser, AVCodecContext, &data, &size, 122 * in_data, in_len, 123 * pts, dts); 124 * in_data += len; 125 * in_len -= len; 126 * 127 * if(size) 128 * decode_frame(data, size); 129 * } 130 * @endcode 131 * 132 * @deprecated Use av_parser_parse2() instead. 133 */ 134int av_parser_parse(AVCodecParserContext *s, 135 AVCodecContext *avctx, 136 uint8_t **poutbuf, int *poutbuf_size, 137 const uint8_t *buf, int buf_size, 138 int64_t pts, int64_t dts) 139{ 140 return av_parser_parse2(s, avctx, poutbuf, poutbuf_size, buf, buf_size, pts, dts, AV_NOPTS_VALUE); 141} 142 143int av_parser_parse2(AVCodecParserContext *s, 144 AVCodecContext *avctx, 145 uint8_t **poutbuf, int *poutbuf_size, 146 const uint8_t *buf, int buf_size, 147 int64_t pts, int64_t dts, 148 int64_t pos) 149{ 150 int index, i; 151 uint8_t dummy_buf[FF_INPUT_BUFFER_PADDING_SIZE]; 152 153 if (buf_size == 0) { 154 /* padding is always necessary even if EOF, so we add it here */ 155 memset(dummy_buf, 0, sizeof(dummy_buf)); 156 buf = dummy_buf; 157 } else if (s->cur_offset + buf_size != 158 s->cur_frame_end[s->cur_frame_start_index]) { /* skip remainder packets */ 159 /* add a new packet descriptor */ 160 i = (s->cur_frame_start_index + 1) & (AV_PARSER_PTS_NB - 1); 161 s->cur_frame_start_index = i; 162 s->cur_frame_offset[i] = s->cur_offset; 163 s->cur_frame_end[i] = s->cur_offset + buf_size; 164 s->cur_frame_pts[i] = pts; 165 s->cur_frame_dts[i] = dts; 166 s->cur_frame_pos[i] = pos; 167 } 168 169 if (s->fetch_timestamp){ 170 s->fetch_timestamp=0; 171 s->last_pts = s->pts; 172 s->last_dts = s->dts; 173 s->last_pos = s->pos; 174 ff_fetch_timestamp(s, 0, 0); 175 } 176 177 /* WARNING: the returned index can be negative */ 178 index = s->parser->parser_parse(s, avctx, (const uint8_t **)poutbuf, poutbuf_size, buf, buf_size); 179//av_log(NULL, AV_LOG_DEBUG, "parser: in:%"PRId64", %"PRId64", out:%"PRId64", %"PRId64", in:%d out:%d id:%d\n", pts, dts, s->last_pts, s->last_dts, buf_size, *poutbuf_size, avctx->codec_id); 180 /* update the file pointer */ 181 if (*poutbuf_size) { 182 /* fill the data for the current frame */ 183 s->frame_offset = s->next_frame_offset; 184 185 /* offset of the next frame */ 186 s->next_frame_offset = s->cur_offset + index; 187 s->fetch_timestamp=1; 188 } 189 if (index < 0) 190 index = 0; 191 s->cur_offset += index; 192 return index; 193} 194 195/** 196 * 197 * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed 198 * @deprecated use AVBitstreamFilter 199 */ 200int av_parser_change(AVCodecParserContext *s, 201 AVCodecContext *avctx, 202 uint8_t **poutbuf, int *poutbuf_size, 203 const uint8_t *buf, int buf_size, int keyframe){ 204 205 if(s && s->parser->split){ 206 if((avctx->flags & CODEC_FLAG_GLOBAL_HEADER) || (avctx->flags2 & CODEC_FLAG2_LOCAL_HEADER)){ 207 int i= s->parser->split(avctx, buf, buf_size); 208 buf += i; 209 buf_size -= i; 210 } 211 } 212 213 /* cast to avoid warning about discarding qualifiers */ 214 *poutbuf= (uint8_t *) buf; 215 *poutbuf_size= buf_size; 216 if(avctx->extradata){ 217 if( (keyframe && (avctx->flags2 & CODEC_FLAG2_LOCAL_HEADER)) 218 /*||(s->pict_type != FF_I_TYPE && (s->flags & PARSER_FLAG_DUMP_EXTRADATA_AT_NOKEY))*/ 219 /*||(? && (s->flags & PARSER_FLAG_DUMP_EXTRADATA_AT_BEGIN)*/){ 220 int size= buf_size + avctx->extradata_size; 221 *poutbuf_size= size; 222 *poutbuf= av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE); 223 224 memcpy(*poutbuf, avctx->extradata, avctx->extradata_size); 225 memcpy((*poutbuf) + avctx->extradata_size, buf, buf_size + FF_INPUT_BUFFER_PADDING_SIZE); 226 return 1; 227 } 228 } 229 230 return 0; 231} 232 233void av_parser_close(AVCodecParserContext *s) 234{ 235 if(s){ 236 if (s->parser->parser_close) 237 s->parser->parser_close(s); 238 av_free(s->priv_data); 239 av_free(s); 240 } 241} 242 243/*****************************************************/ 244 245/** 246 * combines the (truncated) bitstream to a complete frame 247 * @return -1 if no complete frame could be created, AVERROR(ENOMEM) if there was a memory allocation error 248 */ 249int ff_combine_frame(ParseContext *pc, int next, const uint8_t **buf, int *buf_size) 250{ 251#if 0 252 if(pc->overread){ 253 printf("overread %d, state:%X next:%d index:%d o_index:%d\n", pc->overread, pc->state, next, pc->index, pc->overread_index); 254 printf("%X %X %X %X\n", (*buf)[0], (*buf)[1],(*buf)[2],(*buf)[3]); 255 } 256#endif 257 258 /* Copy overread bytes from last frame into buffer. */ 259 for(; pc->overread>0; pc->overread--){ 260 pc->buffer[pc->index++]= pc->buffer[pc->overread_index++]; 261 } 262 263 /* flush remaining if EOF */ 264 if(!*buf_size && next == END_NOT_FOUND){ 265 next= 0; 266 } 267 268 pc->last_index= pc->index; 269 270 /* copy into buffer end return */ 271 if(next == END_NOT_FOUND){ 272 void* new_buffer = av_fast_realloc(pc->buffer, &pc->buffer_size, (*buf_size) + pc->index + FF_INPUT_BUFFER_PADDING_SIZE); 273 274 if(!new_buffer) 275 return AVERROR(ENOMEM); 276 pc->buffer = new_buffer; 277 memcpy(&pc->buffer[pc->index], *buf, *buf_size); 278 pc->index += *buf_size; 279 return -1; 280 } 281 282 *buf_size= 283 pc->overread_index= pc->index + next; 284 285 /* append to buffer */ 286 if(pc->index){ 287 void* new_buffer = av_fast_realloc(pc->buffer, &pc->buffer_size, next + pc->index + FF_INPUT_BUFFER_PADDING_SIZE); 288 289 if(!new_buffer) 290 return AVERROR(ENOMEM); 291 pc->buffer = new_buffer; 292 memcpy(&pc->buffer[pc->index], *buf, next + FF_INPUT_BUFFER_PADDING_SIZE ); 293 pc->index = 0; 294 *buf= pc->buffer; 295 } 296 297 /* store overread bytes */ 298 for(;next < 0; next++){ 299 pc->state = (pc->state<<8) | pc->buffer[pc->last_index + next]; 300 pc->state64 = (pc->state64<<8) | pc->buffer[pc->last_index + next]; 301 pc->overread++; 302 } 303 304#if 0 305 if(pc->overread){ 306 printf("overread %d, state:%X next:%d index:%d o_index:%d\n", pc->overread, pc->state, next, pc->index, pc->overread_index); 307 printf("%X %X %X %X\n", (*buf)[0], (*buf)[1],(*buf)[2],(*buf)[3]); 308 } 309#endif 310 311 return 0; 312} 313 314void ff_parse_close(AVCodecParserContext *s) 315{ 316 ParseContext *pc = s->priv_data; 317 318 av_freep(&pc->buffer); 319} 320 321void ff_parse1_close(AVCodecParserContext *s) 322{ 323 ParseContext1 *pc1 = s->priv_data; 324 325 av_free(pc1->pc.buffer); 326 av_free(pc1->enc); 327} 328 329/*************************/ 330 331int ff_mpeg4video_split(AVCodecContext *avctx, 332 const uint8_t *buf, int buf_size) 333{ 334 int i; 335 uint32_t state= -1; 336 337 for(i=0; i<buf_size; i++){ 338 state= (state<<8) | buf[i]; 339 if(state == 0x1B3 || state == 0x1B6) 340 return i-3; 341 } 342 return 0; 343} 344