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00023 #include "parser.h"
00024
00025 static AVCodecParser *av_first_parser = NULL;
00026
00027 AVCodecParser* av_parser_next(AVCodecParser *p){
00028 if(p) return p->next;
00029 else return av_first_parser;
00030 }
00031
00032 void av_register_codec_parser(AVCodecParser *parser)
00033 {
00034 parser->next = av_first_parser;
00035 av_first_parser = parser;
00036 }
00037
00038 AVCodecParserContext *av_parser_init(int codec_id)
00039 {
00040 AVCodecParserContext *s;
00041 AVCodecParser *parser;
00042 int ret;
00043
00044 if(codec_id == CODEC_ID_NONE)
00045 return NULL;
00046
00047 for(parser = av_first_parser; parser != NULL; parser = parser->next) {
00048 if (parser->codec_ids[0] == codec_id ||
00049 parser->codec_ids[1] == codec_id ||
00050 parser->codec_ids[2] == codec_id ||
00051 parser->codec_ids[3] == codec_id ||
00052 parser->codec_ids[4] == codec_id)
00053 goto found;
00054 }
00055 return NULL;
00056 found:
00057 s = av_mallocz(sizeof(AVCodecParserContext));
00058 if (!s)
00059 return NULL;
00060 s->parser = parser;
00061 s->priv_data = av_mallocz(parser->priv_data_size);
00062 if (!s->priv_data) {
00063 av_free(s);
00064 return NULL;
00065 }
00066 if (parser->parser_init) {
00067 ret = parser->parser_init(s);
00068 if (ret != 0) {
00069 av_free(s->priv_data);
00070 av_free(s);
00071 return NULL;
00072 }
00073 }
00074 s->fetch_timestamp=1;
00075 s->pict_type = FF_I_TYPE;
00076 s->key_frame = -1;
00077 s->convergence_duration = 0;
00078 s->dts_sync_point = INT_MIN;
00079 s->dts_ref_dts_delta = INT_MIN;
00080 s->pts_dts_delta = INT_MIN;
00081 return s;
00082 }
00083
00084 void ff_fetch_timestamp(AVCodecParserContext *s, int off, int remove){
00085 int i;
00086
00087 s->dts= s->pts= AV_NOPTS_VALUE;
00088 s->pos= -1;
00089 s->offset= 0;
00090 for(i = 0; i < AV_PARSER_PTS_NB; i++) {
00091 if ( s->cur_offset + off >= s->cur_frame_offset[i]
00092 && (s->frame_offset < s->cur_frame_offset[i] ||
00093 (!s->frame_offset && !s->next_frame_offset))
00094
00095 && s->cur_frame_end[i]){
00096 s->dts= s->cur_frame_dts[i];
00097 s->pts= s->cur_frame_pts[i];
00098 s->pos= s->cur_frame_pos[i];
00099 s->offset = s->next_frame_offset - s->cur_frame_offset[i];
00100 if(remove)
00101 s->cur_frame_offset[i]= INT64_MAX;
00102 if(s->cur_offset + off < s->cur_frame_end[i])
00103 break;
00104 }
00105 }
00106 }
00107
00134 int av_parser_parse(AVCodecParserContext *s,
00135 AVCodecContext *avctx,
00136 uint8_t **poutbuf, int *poutbuf_size,
00137 const uint8_t *buf, int buf_size,
00138 int64_t pts, int64_t dts)
00139 {
00140 return av_parser_parse2(s, avctx, poutbuf, poutbuf_size, buf, buf_size, pts, dts, AV_NOPTS_VALUE);
00141 }
00142
00143 int av_parser_parse2(AVCodecParserContext *s,
00144 AVCodecContext *avctx,
00145 uint8_t **poutbuf, int *poutbuf_size,
00146 const uint8_t *buf, int buf_size,
00147 int64_t pts, int64_t dts,
00148 int64_t pos)
00149 {
00150 int index, i;
00151 uint8_t dummy_buf[FF_INPUT_BUFFER_PADDING_SIZE];
00152
00153 if(!(s->flags & PARSER_FLAG_FETCHED_OFFSET)) {
00154 s->next_frame_offset =
00155 s->cur_offset = pos;
00156 s->flags |= PARSER_FLAG_FETCHED_OFFSET;
00157 }
00158
00159 if (buf_size == 0) {
00160
00161 memset(dummy_buf, 0, sizeof(dummy_buf));
00162 buf = dummy_buf;
00163 } else if (s->cur_offset + buf_size !=
00164 s->cur_frame_end[s->cur_frame_start_index]) {
00165
00166 i = (s->cur_frame_start_index + 1) & (AV_PARSER_PTS_NB - 1);
00167 s->cur_frame_start_index = i;
00168 s->cur_frame_offset[i] = s->cur_offset;
00169 s->cur_frame_end[i] = s->cur_offset + buf_size;
00170 s->cur_frame_pts[i] = pts;
00171 s->cur_frame_dts[i] = dts;
00172 s->cur_frame_pos[i] = pos;
00173 }
00174
00175 if (s->fetch_timestamp){
00176 s->fetch_timestamp=0;
00177 s->last_pts = s->pts;
00178 s->last_dts = s->dts;
00179 s->last_pos = s->pos;
00180 ff_fetch_timestamp(s, 0, 0);
00181 }
00182
00183
00184 index = s->parser->parser_parse(s, avctx, (const uint8_t **)poutbuf, poutbuf_size, buf, buf_size);
00185
00186
00187 if (*poutbuf_size) {
00188
00189 s->frame_offset = s->next_frame_offset;
00190
00191
00192 s->next_frame_offset = s->cur_offset + index;
00193 s->fetch_timestamp=1;
00194 }
00195 if (index < 0)
00196 index = 0;
00197 s->cur_offset += index;
00198 return index;
00199 }
00200
00206 int av_parser_change(AVCodecParserContext *s,
00207 AVCodecContext *avctx,
00208 uint8_t **poutbuf, int *poutbuf_size,
00209 const uint8_t *buf, int buf_size, int keyframe){
00210
00211 if(s && s->parser->split){
00212 if((avctx->flags & CODEC_FLAG_GLOBAL_HEADER) || (avctx->flags2 & CODEC_FLAG2_LOCAL_HEADER)){
00213 int i= s->parser->split(avctx, buf, buf_size);
00214 buf += i;
00215 buf_size -= i;
00216 }
00217 }
00218
00219
00220 *poutbuf= (uint8_t *) buf;
00221 *poutbuf_size= buf_size;
00222 if(avctx->extradata){
00223 if( (keyframe && (avctx->flags2 & CODEC_FLAG2_LOCAL_HEADER))
00224
00225 ){
00226 int size= buf_size + avctx->extradata_size;
00227 *poutbuf_size= size;
00228 *poutbuf= av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
00229
00230 memcpy(*poutbuf, avctx->extradata, avctx->extradata_size);
00231 memcpy((*poutbuf) + avctx->extradata_size, buf, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
00232 return 1;
00233 }
00234 }
00235
00236 return 0;
00237 }
00238
00239 void av_parser_close(AVCodecParserContext *s)
00240 {
00241 if(s){
00242 if (s->parser->parser_close)
00243 s->parser->parser_close(s);
00244 av_free(s->priv_data);
00245 av_free(s);
00246 }
00247 }
00248
00249
00250
00255 int ff_combine_frame(ParseContext *pc, int next, const uint8_t **buf, int *buf_size)
00256 {
00257 #if 0
00258 if(pc->overread){
00259 printf("overread %d, state:%X next:%d index:%d o_index:%d\n", pc->overread, pc->state, next, pc->index, pc->overread_index);
00260 printf("%X %X %X %X\n", (*buf)[0], (*buf)[1],(*buf)[2],(*buf)[3]);
00261 }
00262 #endif
00263
00264
00265 for(; pc->overread>0; pc->overread--){
00266 pc->buffer[pc->index++]= pc->buffer[pc->overread_index++];
00267 }
00268
00269
00270 if(!*buf_size && next == END_NOT_FOUND){
00271 next= 0;
00272 }
00273
00274 pc->last_index= pc->index;
00275
00276
00277 if(next == END_NOT_FOUND){
00278 void* new_buffer = av_fast_realloc(pc->buffer, &pc->buffer_size, (*buf_size) + pc->index + FF_INPUT_BUFFER_PADDING_SIZE);
00279
00280 if(!new_buffer)
00281 return AVERROR(ENOMEM);
00282 pc->buffer = new_buffer;
00283 memcpy(&pc->buffer[pc->index], *buf, *buf_size);
00284 pc->index += *buf_size;
00285 return -1;
00286 }
00287
00288 *buf_size=
00289 pc->overread_index= pc->index + next;
00290
00291
00292 if(pc->index){
00293 void* new_buffer = av_fast_realloc(pc->buffer, &pc->buffer_size, next + pc->index + FF_INPUT_BUFFER_PADDING_SIZE);
00294
00295 if(!new_buffer)
00296 return AVERROR(ENOMEM);
00297 pc->buffer = new_buffer;
00298 memcpy(&pc->buffer[pc->index], *buf, next + FF_INPUT_BUFFER_PADDING_SIZE );
00299 pc->index = 0;
00300 *buf= pc->buffer;
00301 }
00302
00303
00304 for(;next < 0; next++){
00305 pc->state = (pc->state<<8) | pc->buffer[pc->last_index + next];
00306 pc->state64 = (pc->state64<<8) | pc->buffer[pc->last_index + next];
00307 pc->overread++;
00308 }
00309
00310 #if 0
00311 if(pc->overread){
00312 printf("overread %d, state:%X next:%d index:%d o_index:%d\n", pc->overread, pc->state, next, pc->index, pc->overread_index);
00313 printf("%X %X %X %X\n", (*buf)[0], (*buf)[1],(*buf)[2],(*buf)[3]);
00314 }
00315 #endif
00316
00317 return 0;
00318 }
00319
00320 void ff_parse_close(AVCodecParserContext *s)
00321 {
00322 ParseContext *pc = s->priv_data;
00323
00324 av_freep(&pc->buffer);
00325 }
00326
00327 void ff_parse1_close(AVCodecParserContext *s)
00328 {
00329 ParseContext1 *pc1 = s->priv_data;
00330
00331 av_free(pc1->pc.buffer);
00332 av_free(pc1->enc);
00333 }
00334
00335
00336
00337 int ff_mpeg4video_split(AVCodecContext *avctx,
00338 const uint8_t *buf, int buf_size)
00339 {
00340 int i;
00341 uint32_t state= -1;
00342
00343 for(i=0; i<buf_size; i++){
00344 state= (state<<8) | buf[i];
00345 if(state == 0x1B3 || state == 0x1B6)
00346 return i-3;
00347 }
00348 return 0;
00349 }