yading@10: /*
yading@10:  * Audio and Video frame extraction
yading@10:  * Copyright (c) 2003 Fabrice Bellard
yading@10:  * Copyright (c) 2003 Michael Niedermayer
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: #include <string.h>
yading@10: 
yading@10: #include "parser.h"
yading@10: #include "libavutil/mem.h"
yading@10: 
yading@10: static AVCodecParser *av_first_parser = NULL;
yading@10: 
yading@10: AVCodecParser* av_parser_next(AVCodecParser *p){
yading@10:     if(p) return p->next;
yading@10:     else  return av_first_parser;
yading@10: }
yading@10: 
yading@10: void av_register_codec_parser(AVCodecParser *parser)
yading@10: {
yading@10:     parser->next = av_first_parser;
yading@10:     av_first_parser = parser;
yading@10: }
yading@10: 
yading@10: AVCodecParserContext *av_parser_init(int codec_id)
yading@10: {
yading@10:     AVCodecParserContext *s = NULL;
yading@10:     AVCodecParser *parser;
yading@10:     int ret;
yading@10: 
yading@10:     if(codec_id == AV_CODEC_ID_NONE)
yading@10:         return NULL;
yading@10: 
yading@10:     for(parser = av_first_parser; parser != NULL; parser = parser->next) {
yading@10:         if (parser->codec_ids[0] == codec_id ||
yading@10:             parser->codec_ids[1] == codec_id ||
yading@10:             parser->codec_ids[2] == codec_id ||
yading@10:             parser->codec_ids[3] == codec_id ||
yading@10:             parser->codec_ids[4] == codec_id)
yading@10:             goto found;
yading@10:     }
yading@10:     return NULL;
yading@10:  found:
yading@10:     s = av_mallocz(sizeof(AVCodecParserContext));
yading@10:     if (!s)
yading@10:         goto err_out;
yading@10:     s->parser = parser;
yading@10:     s->priv_data = av_mallocz(parser->priv_data_size);
yading@10:     if (!s->priv_data)
yading@10:         goto err_out;
yading@10:     s->fetch_timestamp=1;
yading@10:     s->pict_type = AV_PICTURE_TYPE_I;
yading@10:     if (parser->parser_init) {
yading@10:         ret = parser->parser_init(s);
yading@10:         if (ret != 0)
yading@10:             goto err_out;
yading@10:     }
yading@10:     s->key_frame = -1;
yading@10:     s->convergence_duration = 0;
yading@10:     s->dts_sync_point       = INT_MIN;
yading@10:     s->dts_ref_dts_delta    = INT_MIN;
yading@10:     s->pts_dts_delta        = INT_MIN;
yading@10:     return s;
yading@10: 
yading@10: err_out:
yading@10:     if (s)
yading@10:         av_freep(&s->priv_data);
yading@10:     av_free(s);
yading@10:     return NULL;
yading@10: }
yading@10: 
yading@10: void ff_fetch_timestamp(AVCodecParserContext *s, int off, int remove){
yading@10:     int i;
yading@10: 
yading@10:     s->dts= s->pts= AV_NOPTS_VALUE;
yading@10:     s->pos= -1;
yading@10:     s->offset= 0;
yading@10:     for(i = 0; i < AV_PARSER_PTS_NB; i++) {
yading@10:         if (   s->cur_offset + off >= s->cur_frame_offset[i]
yading@10:             && (s->frame_offset < s->cur_frame_offset[i] ||
yading@10:               (!s->frame_offset && !s->next_frame_offset)) // first field/frame
yading@10:             // check disabled since MPEG-TS does not send complete PES packets
yading@10:             && /*s->next_frame_offset + off <*/  s->cur_frame_end[i]){
yading@10:             s->dts= s->cur_frame_dts[i];
yading@10:             s->pts= s->cur_frame_pts[i];
yading@10:             s->pos= s->cur_frame_pos[i];
yading@10:             s->offset = s->next_frame_offset - s->cur_frame_offset[i];
yading@10:             if(remove)
yading@10:                 s->cur_frame_offset[i]= INT64_MAX;
yading@10:             if(s->cur_offset + off < s->cur_frame_end[i])
yading@10:                 break;
yading@10:         }
yading@10:     }
yading@10: }
yading@10: 
yading@10: int av_parser_parse2(AVCodecParserContext *s,
yading@10:                      AVCodecContext *avctx,
yading@10:                      uint8_t **poutbuf, int *poutbuf_size,
yading@10:                      const uint8_t *buf, int buf_size,
yading@10:                      int64_t pts, int64_t dts,
yading@10:                      int64_t pos)
yading@10: {
yading@10:     int index, i;
yading@10:     uint8_t dummy_buf[FF_INPUT_BUFFER_PADDING_SIZE];
yading@10: 
yading@10:     if(!(s->flags & PARSER_FLAG_FETCHED_OFFSET)) {
yading@10:         s->next_frame_offset =
yading@10:         s->cur_offset        = pos;
yading@10:         s->flags |= PARSER_FLAG_FETCHED_OFFSET;
yading@10:     }
yading@10: 
yading@10:     if (buf_size == 0) {
yading@10:         /* padding is always necessary even if EOF, so we add it here */
yading@10:         memset(dummy_buf, 0, sizeof(dummy_buf));
yading@10:         buf = dummy_buf;
yading@10:     } else if (s->cur_offset + buf_size !=
yading@10:                s->cur_frame_end[s->cur_frame_start_index]) { /* skip remainder packets */
yading@10:         /* add a new packet descriptor */
yading@10:             i = (s->cur_frame_start_index + 1) & (AV_PARSER_PTS_NB - 1);
yading@10:             s->cur_frame_start_index = i;
yading@10:             s->cur_frame_offset[i] = s->cur_offset;
yading@10:             s->cur_frame_end[i] = s->cur_offset + buf_size;
yading@10:             s->cur_frame_pts[i] = pts;
yading@10:             s->cur_frame_dts[i] = dts;
yading@10:             s->cur_frame_pos[i] = pos;
yading@10:     }
yading@10: 
yading@10:     if (s->fetch_timestamp){
yading@10:         s->fetch_timestamp=0;
yading@10:         s->last_pts = s->pts;
yading@10:         s->last_dts = s->dts;
yading@10:         s->last_pos = s->pos;
yading@10:         ff_fetch_timestamp(s, 0, 0);
yading@10:     }
yading@10: 
yading@10:     /* WARNING: the returned index can be negative */
yading@10:     index = s->parser->parser_parse(s, avctx, (const uint8_t **)poutbuf, poutbuf_size, buf, buf_size);
yading@10:     /* update the file pointer */
yading@10:     if (*poutbuf_size) {
yading@10:         /* fill the data for the current frame */
yading@10:         s->frame_offset = s->next_frame_offset;
yading@10: 
yading@10:         /* offset of the next frame */
yading@10:         s->next_frame_offset = s->cur_offset + index;
yading@10:         s->fetch_timestamp=1;
yading@10:     }
yading@10:     if (index < 0)
yading@10:         index = 0;
yading@10:     s->cur_offset += index;
yading@10:     return index;
yading@10: }
yading@10: 
yading@10: int av_parser_change(AVCodecParserContext *s,
yading@10:                      AVCodecContext *avctx,
yading@10:                      uint8_t **poutbuf, int *poutbuf_size,
yading@10:                      const uint8_t *buf, int buf_size, int keyframe){
yading@10: 
yading@10:     if(s && s->parser->split){
yading@10:         if((avctx->flags & CODEC_FLAG_GLOBAL_HEADER) || (avctx->flags2 & CODEC_FLAG2_LOCAL_HEADER)){
yading@10:             int i= s->parser->split(avctx, buf, buf_size);
yading@10:             buf += i;
yading@10:             buf_size -= i;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     /* cast to avoid warning about discarding qualifiers */
yading@10:     *poutbuf= (uint8_t *) buf;
yading@10:     *poutbuf_size= buf_size;
yading@10:     if(avctx->extradata){
yading@10:         if(  (keyframe && (avctx->flags2 & CODEC_FLAG2_LOCAL_HEADER))
yading@10:             /*||(s->pict_type != AV_PICTURE_TYPE_I && (s->flags & PARSER_FLAG_DUMP_EXTRADATA_AT_NOKEY))*/
yading@10:             /*||(? && (s->flags & PARSER_FLAG_DUMP_EXTRADATA_AT_BEGIN)*/){
yading@10:             int size= buf_size + avctx->extradata_size;
yading@10:             *poutbuf_size= size;
yading@10:             *poutbuf= av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
yading@10: 
yading@10:             memcpy(*poutbuf, avctx->extradata, avctx->extradata_size);
yading@10:             memcpy((*poutbuf) + avctx->extradata_size, buf, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
yading@10:             return 1;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: void av_parser_close(AVCodecParserContext *s)
yading@10: {
yading@10:     if(s){
yading@10:         if (s->parser->parser_close)
yading@10:             s->parser->parser_close(s);
yading@10:         av_free(s->priv_data);
yading@10:         av_free(s);
yading@10:     }
yading@10: }
yading@10: 
yading@10: /*****************************************************/
yading@10: 
yading@10: int ff_combine_frame(ParseContext *pc, int next, const uint8_t **buf, int *buf_size)
yading@10: {
yading@10:     if(pc->overread){
yading@10:         av_dlog(NULL, "overread %d, state:%X next:%d index:%d o_index:%d\n",
yading@10:                 pc->overread, pc->state, next, pc->index, pc->overread_index);
yading@10:         av_dlog(NULL, "%X %X %X %X\n", (*buf)[0], (*buf)[1], (*buf)[2], (*buf)[3]);
yading@10:     }
yading@10: 
yading@10:     /* Copy overread bytes from last frame into buffer. */
yading@10:     for(; pc->overread>0; pc->overread--){
yading@10:         pc->buffer[pc->index++]= pc->buffer[pc->overread_index++];
yading@10:     }
yading@10: 
yading@10:     /* flush remaining if EOF */
yading@10:     if(!*buf_size && next == END_NOT_FOUND){
yading@10:         next= 0;
yading@10:     }
yading@10: 
yading@10:     pc->last_index= pc->index;
yading@10: 
yading@10:     /* copy into buffer end return */
yading@10:     if(next == END_NOT_FOUND){
yading@10:         void* new_buffer = av_fast_realloc(pc->buffer, &pc->buffer_size, (*buf_size) + pc->index + FF_INPUT_BUFFER_PADDING_SIZE);
yading@10: 
yading@10:         if(!new_buffer)
yading@10:             return AVERROR(ENOMEM);
yading@10:         pc->buffer = new_buffer;
yading@10:         memcpy(&pc->buffer[pc->index], *buf, *buf_size);
yading@10:         pc->index += *buf_size;
yading@10:         return -1;
yading@10:     }
yading@10: 
yading@10:     *buf_size=
yading@10:     pc->overread_index= pc->index + next;
yading@10: 
yading@10:     /* append to buffer */
yading@10:     if(pc->index){
yading@10:         void* new_buffer = av_fast_realloc(pc->buffer, &pc->buffer_size, next + pc->index + FF_INPUT_BUFFER_PADDING_SIZE);
yading@10: 
yading@10:         if(!new_buffer)
yading@10:             return AVERROR(ENOMEM);
yading@10:         pc->buffer = new_buffer;
yading@10:         if (next > -FF_INPUT_BUFFER_PADDING_SIZE)
yading@10:             memcpy(&pc->buffer[pc->index], *buf,
yading@10:                    next + FF_INPUT_BUFFER_PADDING_SIZE);
yading@10:         pc->index = 0;
yading@10:         *buf= pc->buffer;
yading@10:     }
yading@10: 
yading@10:     /* store overread bytes */
yading@10:     for(;next < 0; next++){
yading@10:         pc->state = (pc->state<<8) | pc->buffer[pc->last_index + next];
yading@10:         pc->state64 = (pc->state64<<8) | pc->buffer[pc->last_index + next];
yading@10:         pc->overread++;
yading@10:     }
yading@10: 
yading@10:     if(pc->overread){
yading@10:         av_dlog(NULL, "overread %d, state:%X next:%d index:%d o_index:%d\n",
yading@10:                 pc->overread, pc->state, next, pc->index, pc->overread_index);
yading@10:         av_dlog(NULL, "%X %X %X %X\n", (*buf)[0], (*buf)[1],(*buf)[2],(*buf)[3]);
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: void ff_parse_close(AVCodecParserContext *s)
yading@10: {
yading@10:     ParseContext *pc = s->priv_data;
yading@10: 
yading@10:     av_freep(&pc->buffer);
yading@10: }
yading@10: 
yading@10: /*************************/
yading@10: 
yading@10: int ff_mpeg4video_split(AVCodecContext *avctx,
yading@10:                            const uint8_t *buf, int buf_size)
yading@10: {
yading@10:     int i;
yading@10:     uint32_t state= -1;
yading@10: 
yading@10:     for(i=0; i<buf_size; i++){
yading@10:         state= (state<<8) | buf[i];
yading@10:         if(state == 0x1B3 || state == 0x1B6)
yading@10:             return i-3;
yading@10:     }
yading@10:     return 0;
yading@10: }