| /* |
| * 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->offset= 0; |
| for(i = 0; i < AV_PARSER_PTS_NB; i++) { |
| if ( s->next_frame_offset + off >= s->cur_frame_offset[i] |
| &&(s-> frame_offset < s->cur_frame_offset[i] || !s->frame_offset) |
| //check is disabled becausue 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->offset = s->next_frame_offset - s->cur_frame_offset[i]; |
| if(remove) |
| s->cur_frame_offset[i]= INT64_MAX; |
| } |
| } |
| } |
| |
| /** |
| * |
| * @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 |
| */ |
| 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) |
| { |
| 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 { |
| /* add a new packet descriptor */ |
| if(pts != AV_NOPTS_VALUE || dts != AV_NOPTS_VALUE){ |
| 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; |
| } |
| } |
| |
| if (s->fetch_timestamp){ |
| s->fetch_timestamp=0; |
| s->last_pts = s->pts; |
| s->last_dts = s->dts; |
| 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 |
| * @returns -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; |
| } |
