1 files changed, 300 insertions, 0 deletions

diff --git a/ffmpeg/libavcodec/parser.c b/ffmpeg/libavcodec/parser.c
new file mode 100644
index 0000000..f7cb5cf
--- /dev/null
+++ b/ffmpeg/libavcodec/parser.c
@@ -0,0 +1,300 @@
+/*
+ * 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 <string.h>
+
+#include "parser.h"
+#include "libavutil/mem.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 = NULL;
+    AVCodecParser *parser;
+    int ret;
+
+    if(codec_id == AV_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)
+        goto err_out;
+    s->parser = parser;
+    s->priv_data = av_mallocz(parser->priv_data_size);
+    if (!s->priv_data)
+        goto err_out;
+    s->fetch_timestamp=1;
+    s->pict_type = AV_PICTURE_TYPE_I;
+    if (parser->parser_init) {
+        ret = parser->parser_init(s);
+        if (ret != 0)
+            goto err_out;
+    }
+    s->key_frame = -1;
+    s->convergence_duration = 0;
+    s->dts_sync_point       = INT_MIN;
+    s->dts_ref_dts_delta    = INT_MIN;
+    s->pts_dts_delta        = INT_MIN;
+    return s;
+
+err_out:
+    if (s)
+        av_freep(&s->priv_data);
+    av_free(s);
+    return NULL;
+}
+
+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 disabled since MPEG-TS does not 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;
+        }
+    }
+}
+
+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(!(s->flags & PARSER_FLAG_FETCHED_OFFSET)) {
+        s->next_frame_offset =
+        s->cur_offset        = pos;
+        s->flags |= PARSER_FLAG_FETCHED_OFFSET;
+    }
+
+    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);
+    /* 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;
+}
+
+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 != AV_PICTURE_TYPE_I && (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);
+    }
+}
+
+/*****************************************************/
+
+int ff_combine_frame(ParseContext *pc, int next, const uint8_t **buf, int *buf_size)
+{
+    if(pc->overread){
+        av_dlog(NULL, "overread %d, state:%X next:%d index:%d o_index:%d\n",
+                pc->overread, pc->state, next, pc->index, pc->overread_index);
+        av_dlog(NULL, "%X %X %X %X\n", (*buf)[0], (*buf)[1], (*buf)[2], (*buf)[3]);
+    }
+
+    /* 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;
+        if (next > -FF_INPUT_BUFFER_PADDING_SIZE)
+            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(pc->overread){
+        av_dlog(NULL, "overread %d, state:%X next:%d index:%d o_index:%d\n",
+                pc->overread, pc->state, next, pc->index, pc->overread_index);
+        av_dlog(NULL, "%X %X %X %X\n", (*buf)[0], (*buf)[1],(*buf)[2],(*buf)[3]);
+    }
+
+    return 0;
+}
+
+void ff_parse_close(AVCodecParserContext *s)
+{
+    ParseContext *pc = s->priv_data;
+
+    av_freep(&pc->buffer);
+}
+
+/*************************/
+
+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;
+}