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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 if (parser->priv_data_size) {
00062 s->priv_data = av_mallocz(parser->priv_data_size);
00063 if (!s->priv_data) {
00064 av_free(s);
00065 return NULL;
00066 }
00067 }
00068 if (parser->parser_init) {
00069 ret = parser->parser_init(s);
00070 if (ret != 0) {
00071 av_free(s->priv_data);
00072 av_free(s);
00073 return NULL;
00074 }
00075 }
00076 s->fetch_timestamp=1;
00077 s->pict_type = AV_PICTURE_TYPE_I;
00078 s->key_frame = -1;
00079 s->convergence_duration = 0;
00080 s->dts_sync_point = INT_MIN;
00081 s->dts_ref_dts_delta = INT_MIN;
00082 s->pts_dts_delta = INT_MIN;
00083 return s;
00084 }
00085
00086 void ff_fetch_timestamp(AVCodecParserContext *s, int off, int remove){
00087 int i;
00088
00089 s->dts= s->pts= AV_NOPTS_VALUE;
00090 s->pos= -1;
00091 s->offset= 0;
00092 for(i = 0; i < AV_PARSER_PTS_NB; i++) {
00093 if ( s->cur_offset + off >= s->cur_frame_offset[i]
00094 && (s->frame_offset < s->cur_frame_offset[i] ||
00095 (!s->frame_offset && !s->next_frame_offset))
00096
00097 && s->cur_frame_end[i]){
00098 s->dts= s->cur_frame_dts[i];
00099 s->pts= s->cur_frame_pts[i];
00100 s->pos= s->cur_frame_pos[i];
00101 s->offset = s->next_frame_offset - s->cur_frame_offset[i];
00102 if(remove)
00103 s->cur_frame_offset[i]= INT64_MAX;
00104 if(s->cur_offset + off < s->cur_frame_end[i])
00105 break;
00106 }
00107 }
00108 }
00109
00110 int av_parser_parse2(AVCodecParserContext *s,
00111 AVCodecContext *avctx,
00112 uint8_t **poutbuf, int *poutbuf_size,
00113 const uint8_t *buf, int buf_size,
00114 int64_t pts, int64_t dts,
00115 int64_t pos)
00116 {
00117 int index, i;
00118 uint8_t dummy_buf[FF_INPUT_BUFFER_PADDING_SIZE];
00119
00120 if(!(s->flags & PARSER_FLAG_FETCHED_OFFSET)) {
00121 s->next_frame_offset =
00122 s->cur_offset = pos;
00123 s->flags |= PARSER_FLAG_FETCHED_OFFSET;
00124 }
00125
00126 if (buf_size == 0) {
00127
00128 memset(dummy_buf, 0, sizeof(dummy_buf));
00129 buf = dummy_buf;
00130 } else if (s->cur_offset + buf_size !=
00131 s->cur_frame_end[s->cur_frame_start_index]) {
00132
00133 i = (s->cur_frame_start_index + 1) & (AV_PARSER_PTS_NB - 1);
00134 s->cur_frame_start_index = i;
00135 s->cur_frame_offset[i] = s->cur_offset;
00136 s->cur_frame_end[i] = s->cur_offset + buf_size;
00137 s->cur_frame_pts[i] = pts;
00138 s->cur_frame_dts[i] = dts;
00139 s->cur_frame_pos[i] = pos;
00140 }
00141
00142 if (s->fetch_timestamp){
00143 s->fetch_timestamp=0;
00144 s->last_pts = s->pts;
00145 s->last_dts = s->dts;
00146 s->last_pos = s->pos;
00147 ff_fetch_timestamp(s, 0, 0);
00148 }
00149
00150
00151 index = s->parser->parser_parse(s, avctx, (const uint8_t **)poutbuf, poutbuf_size, buf, buf_size);
00152
00153
00154 if (*poutbuf_size) {
00155
00156 s->frame_offset = s->next_frame_offset;
00157
00158
00159 s->next_frame_offset = s->cur_offset + index;
00160 s->fetch_timestamp=1;
00161 }
00162 if (index < 0)
00163 index = 0;
00164 s->cur_offset += index;
00165 return index;
00166 }
00167
00173 int av_parser_change(AVCodecParserContext *s,
00174 AVCodecContext *avctx,
00175 uint8_t **poutbuf, int *poutbuf_size,
00176 const uint8_t *buf, int buf_size, int keyframe){
00177
00178 if(s && s->parser->split){
00179 if((avctx->flags & CODEC_FLAG_GLOBAL_HEADER) || (avctx->flags2 & CODEC_FLAG2_LOCAL_HEADER)){
00180 int i= s->parser->split(avctx, buf, buf_size);
00181 buf += i;
00182 buf_size -= i;
00183 }
00184 }
00185
00186
00187 *poutbuf= (uint8_t *) buf;
00188 *poutbuf_size= buf_size;
00189 if(avctx->extradata){
00190 if( (keyframe && (avctx->flags2 & CODEC_FLAG2_LOCAL_HEADER))
00191
00192 ){
00193 int size= buf_size + avctx->extradata_size;
00194 *poutbuf_size= size;
00195 *poutbuf= av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
00196
00197 memcpy(*poutbuf, avctx->extradata, avctx->extradata_size);
00198 memcpy((*poutbuf) + avctx->extradata_size, buf, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
00199 return 1;
00200 }
00201 }
00202
00203 return 0;
00204 }
00205
00206 void av_parser_close(AVCodecParserContext *s)
00207 {
00208 if(s){
00209 if (s->parser->parser_close)
00210 s->parser->parser_close(s);
00211 av_free(s->priv_data);
00212 av_free(s);
00213 }
00214 }
00215
00216
00217
00222 int ff_combine_frame(ParseContext *pc, int next, const uint8_t **buf, int *buf_size)
00223 {
00224 if(pc->overread){
00225 av_dlog(pc, "overread %d, state:%X next:%d index:%d o_index:%d\n",
00226 pc->overread, pc->state, next, pc->index, pc->overread_index);
00227 av_dlog(pc, "%X %X %X %X\n", (*buf)[0], (*buf)[1], (*buf)[2], (*buf)[3]);
00228 }
00229
00230
00231 for(; pc->overread>0; pc->overread--){
00232 pc->buffer[pc->index++]= pc->buffer[pc->overread_index++];
00233 }
00234
00235
00236 if(!*buf_size && next == END_NOT_FOUND){
00237 next= 0;
00238 }
00239
00240 pc->last_index= pc->index;
00241
00242
00243 if(next == END_NOT_FOUND){
00244 void* new_buffer = av_fast_realloc(pc->buffer, &pc->buffer_size, (*buf_size) + pc->index + FF_INPUT_BUFFER_PADDING_SIZE);
00245
00246 if(!new_buffer)
00247 return AVERROR(ENOMEM);
00248 pc->buffer = new_buffer;
00249 memcpy(&pc->buffer[pc->index], *buf, *buf_size);
00250 pc->index += *buf_size;
00251 return -1;
00252 }
00253
00254 *buf_size=
00255 pc->overread_index= pc->index + next;
00256
00257
00258 if(pc->index){
00259 void* new_buffer = av_fast_realloc(pc->buffer, &pc->buffer_size, next + pc->index + FF_INPUT_BUFFER_PADDING_SIZE);
00260
00261 if(!new_buffer)
00262 return AVERROR(ENOMEM);
00263 pc->buffer = new_buffer;
00264 memcpy(&pc->buffer[pc->index], *buf, next + FF_INPUT_BUFFER_PADDING_SIZE );
00265 pc->index = 0;
00266 *buf= pc->buffer;
00267 }
00268
00269
00270 for(;next < 0; next++){
00271 pc->state = (pc->state<<8) | pc->buffer[pc->last_index + next];
00272 pc->state64 = (pc->state64<<8) | pc->buffer[pc->last_index + next];
00273 pc->overread++;
00274 }
00275
00276 if(pc->overread){
00277 av_dlog(pc, "overread %d, state:%X next:%d index:%d o_index:%d\n",
00278 pc->overread, pc->state, next, pc->index, pc->overread_index);
00279 av_dlog(pc, "%X %X %X %X\n", (*buf)[0], (*buf)[1],(*buf)[2],(*buf)[3]);
00280 }
00281
00282 return 0;
00283 }
00284
00285 void ff_parse_close(AVCodecParserContext *s)
00286 {
00287 ParseContext *pc = s->priv_data;
00288
00289 av_freep(&pc->buffer);
00290 }
00291
00292 void ff_parse1_close(AVCodecParserContext *s)
00293 {
00294 ParseContext1 *pc1 = s->priv_data;
00295
00296 av_free(pc1->pc.buffer);
00297 av_free(pc1->enc);
00298 }
00299
00300
00301
00302 int ff_mpeg4video_split(AVCodecContext *avctx,
00303 const uint8_t *buf, int buf_size)
00304 {
00305 int i;
00306 uint32_t state= -1;
00307
00308 for(i=0; i<buf_size; i++){
00309 state= (state<<8) | buf[i];
00310 if(state == 0x1B3 || state == 0x1B6)
00311 return i-3;
00312 }
00313 return 0;
00314 }