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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 = AV_NOPTS_VALUE;
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->offset= 0;
00089 for(i = 0; i < AV_PARSER_PTS_NB; i++) {
00090 if ( s->next_frame_offset + off >= s->cur_frame_offset[i]
00091 &&(s-> frame_offset < s->cur_frame_offset[i] || !s->frame_offset)
00092
00093 && s->cur_frame_end[i]){
00094 s->dts= s->cur_frame_dts[i];
00095 s->pts= s->cur_frame_pts[i];
00096 s->offset = s->next_frame_offset - s->cur_frame_offset[i];
00097 if(remove)
00098 s->cur_frame_offset[i]= INT64_MAX;
00099 }
00100 }
00101 }
00102
00127 int av_parser_parse(AVCodecParserContext *s,
00128 AVCodecContext *avctx,
00129 uint8_t **poutbuf, int *poutbuf_size,
00130 const uint8_t *buf, int buf_size,
00131 int64_t pts, int64_t dts)
00132 {
00133 int index, i;
00134 uint8_t dummy_buf[FF_INPUT_BUFFER_PADDING_SIZE];
00135
00136 if (buf_size == 0) {
00137
00138 memset(dummy_buf, 0, sizeof(dummy_buf));
00139 buf = dummy_buf;
00140 } else {
00141
00142 if(pts != AV_NOPTS_VALUE || dts != AV_NOPTS_VALUE){
00143 i = (s->cur_frame_start_index + 1) & (AV_PARSER_PTS_NB - 1);
00144 s->cur_frame_start_index = i;
00145 s->cur_frame_offset[i] = s->cur_offset;
00146 s->cur_frame_end[i] = s->cur_offset + buf_size;
00147 s->cur_frame_pts[i] = pts;
00148 s->cur_frame_dts[i] = dts;
00149 }
00150 }
00151
00152 if (s->fetch_timestamp){
00153 s->fetch_timestamp=0;
00154 s->last_pts = s->pts;
00155 s->last_dts = s->dts;
00156 ff_fetch_timestamp(s, 0, 0);
00157 }
00158
00159
00160 index = s->parser->parser_parse(s, avctx, (const uint8_t **)poutbuf, poutbuf_size, buf, buf_size);
00161
00162
00163 if (*poutbuf_size) {
00164
00165 s->frame_offset = s->next_frame_offset;
00166
00167
00168 s->next_frame_offset = s->cur_offset + index;
00169 s->fetch_timestamp=1;
00170 }
00171 if (index < 0)
00172 index = 0;
00173 s->cur_offset += index;
00174 return index;
00175 }
00176
00182 int av_parser_change(AVCodecParserContext *s,
00183 AVCodecContext *avctx,
00184 uint8_t **poutbuf, int *poutbuf_size,
00185 const uint8_t *buf, int buf_size, int keyframe){
00186
00187 if(s && s->parser->split){
00188 if((avctx->flags & CODEC_FLAG_GLOBAL_HEADER) || (avctx->flags2 & CODEC_FLAG2_LOCAL_HEADER)){
00189 int i= s->parser->split(avctx, buf, buf_size);
00190 buf += i;
00191 buf_size -= i;
00192 }
00193 }
00194
00195
00196 *poutbuf= (uint8_t *) buf;
00197 *poutbuf_size= buf_size;
00198 if(avctx->extradata){
00199 if( (keyframe && (avctx->flags2 & CODEC_FLAG2_LOCAL_HEADER))
00200
00201 ){
00202 int size= buf_size + avctx->extradata_size;
00203 *poutbuf_size= size;
00204 *poutbuf= av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
00205
00206 memcpy(*poutbuf, avctx->extradata, avctx->extradata_size);
00207 memcpy((*poutbuf) + avctx->extradata_size, buf, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
00208 return 1;
00209 }
00210 }
00211
00212 return 0;
00213 }
00214
00215 void av_parser_close(AVCodecParserContext *s)
00216 {
00217 if(s){
00218 if (s->parser->parser_close)
00219 s->parser->parser_close(s);
00220 av_free(s->priv_data);
00221 av_free(s);
00222 }
00223 }
00224
00225
00226
00231 int ff_combine_frame(ParseContext *pc, int next, const uint8_t **buf, int *buf_size)
00232 {
00233 #if 0
00234 if(pc->overread){
00235 printf("overread %d, state:%X next:%d index:%d o_index:%d\n", pc->overread, pc->state, next, pc->index, pc->overread_index);
00236 printf("%X %X %X %X\n", (*buf)[0], (*buf)[1],(*buf)[2],(*buf)[3]);
00237 }
00238 #endif
00239
00240
00241 for(; pc->overread>0; pc->overread--){
00242 pc->buffer[pc->index++]= pc->buffer[pc->overread_index++];
00243 }
00244
00245
00246 if(!*buf_size && next == END_NOT_FOUND){
00247 next= 0;
00248 }
00249
00250 pc->last_index= pc->index;
00251
00252
00253 if(next == END_NOT_FOUND){
00254 void* new_buffer = av_fast_realloc(pc->buffer, &pc->buffer_size, (*buf_size) + pc->index + FF_INPUT_BUFFER_PADDING_SIZE);
00255
00256 if(!new_buffer)
00257 return AVERROR(ENOMEM);
00258 pc->buffer = new_buffer;
00259 memcpy(&pc->buffer[pc->index], *buf, *buf_size);
00260 pc->index += *buf_size;
00261 return -1;
00262 }
00263
00264 *buf_size=
00265 pc->overread_index= pc->index + next;
00266
00267
00268 if(pc->index){
00269 void* new_buffer = av_fast_realloc(pc->buffer, &pc->buffer_size, next + pc->index + FF_INPUT_BUFFER_PADDING_SIZE);
00270
00271 if(!new_buffer)
00272 return AVERROR(ENOMEM);
00273 pc->buffer = new_buffer;
00274 memcpy(&pc->buffer[pc->index], *buf, next + FF_INPUT_BUFFER_PADDING_SIZE );
00275 pc->index = 0;
00276 *buf= pc->buffer;
00277 }
00278
00279
00280 for(;next < 0; next++){
00281 pc->state = (pc->state<<8) | pc->buffer[pc->last_index + next];
00282 pc->state64 = (pc->state64<<8) | pc->buffer[pc->last_index + next];
00283 pc->overread++;
00284 }
00285
00286 #if 0
00287 if(pc->overread){
00288 printf("overread %d, state:%X next:%d index:%d o_index:%d\n", pc->overread, pc->state, next, pc->index, pc->overread_index);
00289 printf("%X %X %X %X\n", (*buf)[0], (*buf)[1],(*buf)[2],(*buf)[3]);
00290 }
00291 #endif
00292
00293 return 0;
00294 }
00295
00296 void ff_parse_close(AVCodecParserContext *s)
00297 {
00298 ParseContext *pc = s->priv_data;
00299
00300 av_freep(&pc->buffer);
00301 }
00302
00303 void ff_parse1_close(AVCodecParserContext *s)
00304 {
00305 ParseContext1 *pc1 = s->priv_data;
00306
00307 av_free(pc1->pc.buffer);
00308 av_free(pc1->enc);
00309 }
00310
00311
00312
00313 int ff_mpeg4video_split(AVCodecContext *avctx,
00314 const uint8_t *buf, int buf_size)
00315 {
00316 int i;
00317 uint32_t state= -1;
00318
00319 for(i=0; i<buf_size; i++){
00320 state= (state<<8) | buf[i];
00321 if(state == 0x1B3 || state == 0x1B6)
00322 return i-3;
00323 }
00324 return 0;
00325 }