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  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 <string.h>
  24.  
  25. #include "parser.h"
  26. #include "libavutil/atomic.h"
  27. #include "libavutil/mem.h"
  28.  
  29. static AVCodecParser *av_first_parser = NULL;
  30.  
  31. AVCodecParser* av_parser_next(AVCodecParser *p){
  32.     if(p) return p->next;
  33.     else  return av_first_parser;
  34. }
  35.  
  36. void av_register_codec_parser(AVCodecParser *parser)
  37. {
  38.     do {
  39.         parser->next = av_first_parser;
  40.     } while (parser->next != avpriv_atomic_ptr_cas((void * volatile *)&av_first_parser, parser->next, parser));
  41. }
  42.  
  43. AVCodecParserContext *av_parser_init(int codec_id)
  44. {
  45.     AVCodecParserContext *s = NULL;
  46.     AVCodecParser *parser;
  47.     int ret;
  48.  
  49.     if(codec_id == AV_CODEC_ID_NONE)
  50.         return NULL;
  51.  
  52.     for(parser = av_first_parser; parser != NULL; parser = parser->next) {
  53.         if (parser->codec_ids[0] == codec_id ||
  54.             parser->codec_ids[1] == codec_id ||
  55.             parser->codec_ids[2] == codec_id ||
  56.             parser->codec_ids[3] == codec_id ||
  57.             parser->codec_ids[4] == codec_id)
  58.             goto found;
  59.     }
  60.     return NULL;
  61.  found:
  62.     s = av_mallocz(sizeof(AVCodecParserContext));
  63.     if (!s)
  64.         goto err_out;
  65.     s->parser = parser;
  66.     s->priv_data = av_mallocz(parser->priv_data_size);
  67.     if (!s->priv_data)
  68.         goto err_out;
  69.     s->fetch_timestamp=1;
  70.     s->pict_type = AV_PICTURE_TYPE_I;
  71.     if (parser->parser_init) {
  72.         ret = parser->parser_init(s);
  73.         if (ret != 0)
  74.             goto err_out;
  75.     }
  76.     s->key_frame = -1;
  77.     s->convergence_duration = 0;
  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. err_out:
  84.     if (s)
  85.         av_freep(&s->priv_data);
  86.     av_free(s);
  87.     return NULL;
  88. }
  89.  
  90. void ff_fetch_timestamp(AVCodecParserContext *s, int off, int remove){
  91.     int i;
  92.  
  93.     s->dts= s->pts= AV_NOPTS_VALUE;
  94.     s->pos= -1;
  95.     s->offset= 0;
  96.     for(i = 0; i < AV_PARSER_PTS_NB; i++) {
  97.         if (   s->cur_offset + off >= s->cur_frame_offset[i]
  98.             && (s->frame_offset < s->cur_frame_offset[i] ||
  99.               (!s->frame_offset && !s->next_frame_offset)) // first field/frame
  100.             // check disabled since MPEG-TS does not send complete PES packets
  101.             && /*s->next_frame_offset + off <*/  s->cur_frame_end[i]){
  102.             s->dts= s->cur_frame_dts[i];
  103.             s->pts= s->cur_frame_pts[i];
  104.             s->pos= s->cur_frame_pos[i];
  105.             s->offset = s->next_frame_offset - s->cur_frame_offset[i];
  106.             if(remove)
  107.                 s->cur_frame_offset[i]= INT64_MAX;
  108.             if(s->cur_offset + off < s->cur_frame_end[i])
  109.                 break;
  110.         }
  111.     }
  112. }
  113.  
  114. int av_parser_parse2(AVCodecParserContext *s,
  115.                      AVCodecContext *avctx,
  116.                      uint8_t **poutbuf, int *poutbuf_size,
  117.                      const uint8_t *buf, int buf_size,
  118.                      int64_t pts, int64_t dts,
  119.                      int64_t pos)
  120. {
  121.     int index, i;
  122.     uint8_t dummy_buf[FF_INPUT_BUFFER_PADDING_SIZE];
  123.  
  124.     if(!(s->flags & PARSER_FLAG_FETCHED_OFFSET)) {
  125.         s->next_frame_offset =
  126.         s->cur_offset        = pos;
  127.         s->flags |= PARSER_FLAG_FETCHED_OFFSET;
  128.     }
  129.  
  130.     if (buf_size == 0) {
  131.         /* padding is always necessary even if EOF, so we add it here */
  132.         memset(dummy_buf, 0, sizeof(dummy_buf));
  133.         buf = dummy_buf;
  134.     } else if (s->cur_offset + buf_size !=
  135.                s->cur_frame_end[s->cur_frame_start_index]) { /* skip remainder packets */
  136.         /* add a new packet descriptor */
  137.             i = (s->cur_frame_start_index + 1) & (AV_PARSER_PTS_NB - 1);
  138.             s->cur_frame_start_index = i;
  139.             s->cur_frame_offset[i] = s->cur_offset;
  140.             s->cur_frame_end[i] = s->cur_offset + buf_size;
  141.             s->cur_frame_pts[i] = pts;
  142.             s->cur_frame_dts[i] = dts;
  143.             s->cur_frame_pos[i] = pos;
  144.     }
  145.  
  146.     if (s->fetch_timestamp){
  147.         s->fetch_timestamp=0;
  148.         s->last_pts = s->pts;
  149.         s->last_dts = s->dts;
  150.         s->last_pos = s->pos;
  151.         ff_fetch_timestamp(s, 0, 0);
  152.     }
  153.  
  154.     /* WARNING: the returned index can be negative */
  155.     index = s->parser->parser_parse(s, avctx, (const uint8_t **)poutbuf, poutbuf_size, buf, buf_size);
  156.     /* update the file pointer */
  157.     if (*poutbuf_size) {
  158.         /* fill the data for the current frame */
  159.         s->frame_offset = s->next_frame_offset;
  160.  
  161.         /* offset of the next frame */
  162.         s->next_frame_offset = s->cur_offset + index;
  163.         s->fetch_timestamp=1;
  164.     }
  165.     if (index < 0)
  166.         index = 0;
  167.     s->cur_offset += index;
  168.     return index;
  169. }
  170.  
  171. int av_parser_change(AVCodecParserContext *s,
  172.                      AVCodecContext *avctx,
  173.                      uint8_t **poutbuf, int *poutbuf_size,
  174.                      const uint8_t *buf, int buf_size, int keyframe){
  175.  
  176.     if(s && s->parser->split){
  177.         if((avctx->flags & CODEC_FLAG_GLOBAL_HEADER) || (avctx->flags2 & CODEC_FLAG2_LOCAL_HEADER)){
  178.             int i= s->parser->split(avctx, buf, buf_size);
  179.             buf += i;
  180.             buf_size -= i;
  181.         }
  182.     }
  183.  
  184.     /* cast to avoid warning about discarding qualifiers */
  185.     *poutbuf= (uint8_t *) buf;
  186.     *poutbuf_size= buf_size;
  187.     if(avctx->extradata){
  188.         if(  (keyframe && (avctx->flags2 & CODEC_FLAG2_LOCAL_HEADER))
  189.             /*||(s->pict_type != AV_PICTURE_TYPE_I && (s->flags & PARSER_FLAG_DUMP_EXTRADATA_AT_NOKEY))*/
  190.             /*||(? && (s->flags & PARSER_FLAG_DUMP_EXTRADATA_AT_BEGIN)*/){
  191.             int size= buf_size + avctx->extradata_size;
  192.             *poutbuf_size= size;
  193.             *poutbuf= av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
  194.  
  195.             memcpy(*poutbuf, avctx->extradata, avctx->extradata_size);
  196.             memcpy((*poutbuf) + avctx->extradata_size, buf, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
  197.             return 1;
  198.         }
  199.     }
  200.  
  201.     return 0;
  202. }
  203.  
  204. void av_parser_close(AVCodecParserContext *s)
  205. {
  206.     if(s){
  207.         if (s->parser->parser_close)
  208.             s->parser->parser_close(s);
  209.         av_free(s->priv_data);
  210.         av_free(s);
  211.     }
  212. }
  213.  
  214. /*****************************************************/
  215.  
  216. int ff_combine_frame(ParseContext *pc, int next, const uint8_t **buf, int *buf_size)
  217. {
  218.     if(pc->overread){
  219.         av_dlog(NULL, "overread %d, state:%X next:%d index:%d o_index:%d\n",
  220.                 pc->overread, pc->state, next, pc->index, pc->overread_index);
  221.         av_dlog(NULL, "%X %X %X %X\n", (*buf)[0], (*buf)[1], (*buf)[2], (*buf)[3]);
  222.     }
  223.  
  224.     /* Copy overread bytes from last frame into buffer. */
  225.     for(; pc->overread>0; pc->overread--){
  226.         pc->buffer[pc->index++]= pc->buffer[pc->overread_index++];
  227.     }
  228.  
  229.     /* flush remaining if EOF */
  230.     if(!*buf_size && next == END_NOT_FOUND){
  231.         next= 0;
  232.     }
  233.  
  234.     pc->last_index= pc->index;
  235.  
  236.     /* copy into buffer end return */
  237.     if(next == END_NOT_FOUND){
  238.         void* new_buffer = av_fast_realloc(pc->buffer, &pc->buffer_size, (*buf_size) + pc->index + FF_INPUT_BUFFER_PADDING_SIZE);
  239.  
  240.         if(!new_buffer) {
  241.             pc->index = 0;
  242.             return AVERROR(ENOMEM);
  243.         }
  244.         pc->buffer = new_buffer;
  245.         memcpy(&pc->buffer[pc->index], *buf, *buf_size);
  246.         pc->index += *buf_size;
  247.         return -1;
  248.     }
  249.  
  250.     *buf_size=
  251.     pc->overread_index= pc->index + next;
  252.  
  253.     /* append to buffer */
  254.     if(pc->index){
  255.         void* new_buffer = av_fast_realloc(pc->buffer, &pc->buffer_size, next + pc->index + FF_INPUT_BUFFER_PADDING_SIZE);
  256.         if(!new_buffer) {
  257.             pc->overread_index =
  258.             pc->index = 0;
  259.             return AVERROR(ENOMEM);
  260.         }
  261.         pc->buffer = new_buffer;
  262.         if (next > -FF_INPUT_BUFFER_PADDING_SIZE)
  263.             memcpy(&pc->buffer[pc->index], *buf,
  264.                    next + FF_INPUT_BUFFER_PADDING_SIZE);
  265.         pc->index = 0;
  266.         *buf= pc->buffer;
  267.     }
  268.  
  269.     /* store overread bytes */
  270.     for(;next < 0; next++){
  271.         pc->state = (pc->state<<8) | pc->buffer[pc->last_index + next];
  272.         pc->state64 = (pc->state64<<8) | pc->buffer[pc->last_index + next];
  273.         pc->overread++;
  274.     }
  275.  
  276.     if(pc->overread){
  277.         av_dlog(NULL, "overread %d, state:%X next:%d index:%d o_index:%d\n",
  278.                 pc->overread, pc->state, next, pc->index, pc->overread_index);
  279.         av_dlog(NULL, "%X %X %X %X\n", (*buf)[0], (*buf)[1],(*buf)[2],(*buf)[3]);
  280.     }
  281.  
  282.     return 0;
  283. }
  284.  
  285. void ff_parse_close(AVCodecParserContext *s)
  286. {
  287.     ParseContext *pc = s->priv_data;
  288.  
  289.     av_freep(&pc->buffer);
  290. }
  291.  
  292. /*************************/
  293.  
  294. int ff_mpeg4video_split(AVCodecContext *avctx,
  295.                            const uint8_t *buf, int buf_size)
  296. {
  297.     int i;
  298.     uint32_t state= -1;
  299.  
  300.     for(i=0; i<buf_size; i++){
  301.         state= (state<<8) | buf[i];
  302.         if(state == 0x1B3 || state == 0x1B6)
  303.             return i-3;
  304.     }
  305.     return 0;
  306. }
  307.