/* * Audio and Video frame extraction * Copyright (c) 2003 Fabrice Bellard * Copyright (c) 2003 Michael Niedermayer * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "parser.h" static AVCodecParser *av_first_parser = NULL; AVCodecParser* av_parser_next(AVCodecParser *p){ if(p) return p->next; else return av_first_parser; } void av_register_codec_parser(AVCodecParser *parser) { parser->next = av_first_parser; av_first_parser = parser; } AVCodecParserContext *av_parser_init(int codec_id) { AVCodecParserContext *s; AVCodecParser *parser; int ret; if(codec_id == CODEC_ID_NONE) return NULL; for(parser = av_first_parser; parser != NULL; parser = parser->next) { if (parser->codec_ids[0] == codec_id || parser->codec_ids[1] == codec_id || parser->codec_ids[2] == codec_id || parser->codec_ids[3] == codec_id || parser->codec_ids[4] == codec_id) goto found; } return NULL; found: s = av_mallocz(sizeof(AVCodecParserContext)); if (!s) return NULL; s->parser = parser; s->priv_data = av_mallocz(parser->priv_data_size); if (!s->priv_data) { av_free(s); return NULL; } if (parser->parser_init) { ret = parser->parser_init(s); if (ret != 0) { av_free(s->priv_data); av_free(s); return NULL; } } s->fetch_timestamp=1; s->pict_type = FF_I_TYPE; s->key_frame = -1; s->convergence_duration = AV_NOPTS_VALUE; s->dts_sync_point = INT_MIN; s->dts_ref_dts_delta = INT_MIN; s->pts_dts_delta = INT_MIN; return s; } void ff_fetch_timestamp(AVCodecParserContext *s, int off, int remove){ int i; s->dts= s->pts= AV_NOPTS_VALUE; s->pos= -1; s->offset= 0; for(i = 0; i < AV_PARSER_PTS_NB; i++) { if ( s->cur_offset + off >= s->cur_frame_offset[i] && (s->frame_offset < s->cur_frame_offset[i] || (!s->frame_offset && !s->next_frame_offset)) // first field/frame //check is disabled because mpeg-ts doesnt send complete PES packets && /*s->next_frame_offset + off <*/ s->cur_frame_end[i]){ s->dts= s->cur_frame_dts[i]; s->pts= s->cur_frame_pts[i]; s->pos= s->cur_frame_pos[i]; s->offset = s->next_frame_offset - s->cur_frame_offset[i]; if(remove) s->cur_frame_offset[i]= INT64_MAX; if(s->cur_offset + off < s->cur_frame_end[i]) break; } } } /** * * @param buf input * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output) * @param pts input presentation timestamp * @param dts input decoding timestamp * @param poutbuf will contain a pointer to the first byte of the output frame * @param poutbuf_size will contain the length of the output frame * @return the number of bytes of the input bitstream used * * Example: * @code * while(in_len){ * len = av_parser_parse(myparser, AVCodecContext, &data, &size, * in_data, in_len, * pts, dts); * in_data += len; * in_len -= len; * * if(size) * decode_frame(data, size); * } * @endcode * * @deprecated Use av_parser_parse2() instead. */ int av_parser_parse(AVCodecParserContext *s, AVCodecContext *avctx, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size, int64_t pts, int64_t dts) { return av_parser_parse2(s, avctx, poutbuf, poutbuf_size, buf, buf_size, pts, dts, AV_NOPTS_VALUE); } int av_parser_parse2(AVCodecParserContext *s, AVCodecContext *avctx, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size, int64_t pts, int64_t dts, int64_t pos) { int index, i; uint8_t dummy_buf[FF_INPUT_BUFFER_PADDING_SIZE]; if (buf_size == 0) { /* padding is always necessary even if EOF, so we add it here */ memset(dummy_buf, 0, sizeof(dummy_buf)); buf = dummy_buf; } else if (s->cur_offset + buf_size != s->cur_frame_end[s->cur_frame_start_index]) { /* skip remainder packets */ /* add a new packet descriptor */ i = (s->cur_frame_start_index + 1) & (AV_PARSER_PTS_NB - 1); s->cur_frame_start_index = i; s->cur_frame_offset[i] = s->cur_offset; s->cur_frame_end[i] = s->cur_offset + buf_size; s->cur_frame_pts[i] = pts; s->cur_frame_dts[i] = dts; s->cur_frame_pos[i] = pos; } if (s->fetch_timestamp){ s->fetch_timestamp=0; s->last_pts = s->pts; s->last_dts = s->dts; s->last_pos = s->pos; ff_fetch_timestamp(s, 0, 0); } /* WARNING: the returned index can be negative */ index = s->parser->parser_parse(s, avctx, (const uint8_t **)poutbuf, poutbuf_size, buf, buf_size); //av_log(NULL, AV_LOG_DEBUG, "parser: in:%"PRId64", %"PRId64", out:%"PRId64", %"PRId64", in:%d out:%d id:%d\n", pts, dts, s->last_pts, s->last_dts, buf_size, *poutbuf_size, avctx->codec_id); /* update the file pointer */ if (*poutbuf_size) { /* fill the data for the current frame */ s->frame_offset = s->next_frame_offset; /* offset of the next frame */ s->next_frame_offset = s->cur_offset + index; s->fetch_timestamp=1; } if (index < 0) index = 0; s->cur_offset += index; return index; } /** * * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed * @deprecated use AVBitstreamFilter */ int av_parser_change(AVCodecParserContext *s, AVCodecContext *avctx, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size, int keyframe){ if(s && s->parser->split){ if((avctx->flags & CODEC_FLAG_GLOBAL_HEADER) || (avctx->flags2 & CODEC_FLAG2_LOCAL_HEADER)){ int i= s->parser->split(avctx, buf, buf_size); buf += i; buf_size -= i; } } /* cast to avoid warning about discarding qualifiers */ *poutbuf= (uint8_t *) buf; *poutbuf_size= buf_size; if(avctx->extradata){ if( (keyframe && (avctx->flags2 & CODEC_FLAG2_LOCAL_HEADER)) /*||(s->pict_type != FF_I_TYPE && (s->flags & PARSER_FLAG_DUMP_EXTRADATA_AT_NOKEY))*/ /*||(? && (s->flags & PARSER_FLAG_DUMP_EXTRADATA_AT_BEGIN)*/){ int size= buf_size + avctx->extradata_size; *poutbuf_size= size; *poutbuf= av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE); memcpy(*poutbuf, avctx->extradata, avctx->extradata_size); memcpy((*poutbuf) + avctx->extradata_size, buf, buf_size + FF_INPUT_BUFFER_PADDING_SIZE); return 1; } } return 0; } void av_parser_close(AVCodecParserContext *s) { if(s){ if (s->parser->parser_close) s->parser->parser_close(s); av_free(s->priv_data); av_free(s); } } /*****************************************************/ /** * combines the (truncated) bitstream to a complete frame * @return -1 if no complete frame could be created, AVERROR(ENOMEM) if there was a memory allocation error */ int ff_combine_frame(ParseContext *pc, int next, const uint8_t **buf, int *buf_size) { #if 0 if(pc->overread){ printf("overread %d, state:%X next:%d index:%d o_index:%d\n", pc->overread, pc->state, next, pc->index, pc->overread_index); printf("%X %X %X %X\n", (*buf)[0], (*buf)[1],(*buf)[2],(*buf)[3]); } #endif /* Copy overread bytes from last frame into buffer. */ for(; pc->overread>0; pc->overread--){ pc->buffer[pc->index++]= pc->buffer[pc->overread_index++]; } /* flush remaining if EOF */ if(!*buf_size && next == END_NOT_FOUND){ next= 0; } pc->last_index= pc->index; /* copy into buffer end return */ if(next == END_NOT_FOUND){ void* new_buffer = av_fast_realloc(pc->buffer, &pc->buffer_size, (*buf_size) + pc->index + FF_INPUT_BUFFER_PADDING_SIZE); if(!new_buffer) return AVERROR(ENOMEM); pc->buffer = new_buffer; memcpy(&pc->buffer[pc->index], *buf, *buf_size); pc->index += *buf_size; return -1; } *buf_size= pc->overread_index= pc->index + next; /* append to buffer */ if(pc->index){ void* new_buffer = av_fast_realloc(pc->buffer, &pc->buffer_size, next + pc->index + FF_INPUT_BUFFER_PADDING_SIZE); if(!new_buffer) return AVERROR(ENOMEM); pc->buffer = new_buffer; memcpy(&pc->buffer[pc->index], *buf, next + FF_INPUT_BUFFER_PADDING_SIZE ); pc->index = 0; *buf= pc->buffer; } /* store overread bytes */ for(;next < 0; next++){ pc->state = (pc->state<<8) | pc->buffer[pc->last_index + next]; pc->state64 = (pc->state64<<8) | pc->buffer[pc->last_index + next]; pc->overread++; } #if 0 if(pc->overread){ printf("overread %d, state:%X next:%d index:%d o_index:%d\n", pc->overread, pc->state, next, pc->index, pc->overread_index); printf("%X %X %X %X\n", (*buf)[0], (*buf)[1],(*buf)[2],(*buf)[3]); } #endif return 0; } void ff_parse_close(AVCodecParserContext *s) { ParseContext *pc = s->priv_data; av_freep(&pc->buffer); } void ff_parse1_close(AVCodecParserContext *s) { ParseContext1 *pc1 = s->priv_data; av_free(pc1->pc.buffer); av_free(pc1->enc); } /*************************/ int ff_mpeg4video_split(AVCodecContext *avctx, const uint8_t *buf, int buf_size) { int i; uint32_t state= -1; for(i=0; i<buf_size; i++){ state= (state<<8) | buf[i]; if(state == 0x1B3 || state == 0x1B6) return i-3; } return 0; }