Author: spyfeng
Date: Sat Jun 27 15:28:08 2009
New Revision: 4532
Log:
add libavcodec/parser.c into svn.
Added:
seek_api/parser.c
Added: seek_api/parser.c
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ seek_api/parser.c Sat Jun 27 15:28:08 2009 (r4532)
@@ -0,0 +1,342 @@
+/*
+ * 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)
+ //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->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
+ * @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;
+}
