/*
* 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 <stdint.h>
#include <string.h>
#include "libavutil/avassert.h"
#include "libavutil/atomic.h"
#include "libavutil/mem.h"
#include "internal.h"
#include "parser.h"
static AVCodecParser *av_first_parser = NULL;
AVCodecParser *av_parser_next(const AVCodecParser *p)
{
if (p)
return p->next;
else
return av_first_parser;
}
void av_register_codec_parser(AVCodecParser *parser)
{
do {
parser->next = av_first_parser;
} while (parser->next != avpriv_atomic_ptr_cas((void * volatile *)&av_first_parser, parser->next, 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; 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;
s->format = -1;
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 fuzzy
) {
int i;
if (!fuzzy) {
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]){
if (!fuzzy || s->cur_frame_dts[i] != AV_NOPTS_VALUE) {
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];
}
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[AV_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, 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_assert0(index > -0x20000000); // The API does not allow returning AVERROR codes
/* 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 & AV_CODEC_FLAG_GLOBAL_HEADER ||
avctx->flags2 & AV_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 & AV_CODEC_FLAG2_LOCAL_HEADER)) {
int size = buf_size + avctx->extradata_size;
*poutbuf_size = size;
*poutbuf = av_malloc(size + AV_INPUT_BUFFER_PADDING_SIZE);
if (!*poutbuf)
return AVERROR(ENOMEM);
memcpy(*poutbuf
, avctx
->extradata
, avctx
->extradata_size
); memcpy(*poutbuf
+ avctx
->extradata_size
, buf
, buf_size + AV_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_freep(&s->priv_data);
av_free(s);
}
}
int ff_combine_frame(ParseContext *pc, int next,
const uint8_t **buf, int *buf_size)
{
if (pc->overread) {
ff_dlog(NULL, "overread %d, state:%X next:%d index:%d o_index:%d\n",
pc->overread, pc->state, next, pc->index, pc->overread_index);
ff_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 +
AV_INPUT_BUFFER_PADDING_SIZE);
if (!new_buffer) {
av_log(NULL, AV_LOG_ERROR, "Failed to reallocate parser buffer to %d\n", *buf_size + pc->index + AV_INPUT_BUFFER_PADDING_SIZE);
pc->index = 0;
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 +
AV_INPUT_BUFFER_PADDING_SIZE);
if (!new_buffer) {
av_log(NULL, AV_LOG_ERROR, "Failed to reallocate parser buffer to %d\n", next + pc->index + AV_INPUT_BUFFER_PADDING_SIZE);
pc->overread_index =
pc->index = 0;
return AVERROR(ENOMEM);
}
pc->buffer = new_buffer;
if (next > -AV_INPUT_BUFFER_PADDING_SIZE)
memcpy(&pc
->buffer
[pc
->index
], *buf
, next + AV_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) {
ff_dlog(NULL, "overread %d, state:%X next:%d index:%d o_index:%d\n",
pc->overread, pc->state, next, pc->index, pc->overread_index);
ff_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)
{
uint32_t state = -1;
const uint8_t *ptr = buf, *end = buf + buf_size;
while (ptr < end) {
ptr = avpriv_find_start_code(ptr, end, &state);
if (state == 0x1B3 || state == 0x1B6)
return ptr - 4 - buf;
}
return 0;
}