forked from KolibriOS/kolibrios
327 lines
10 KiB
C
327 lines
10 KiB
C
/*
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* Audio and Video frame extraction
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* Copyright (c) 2003 Fabrice Bellard
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* Copyright (c) 2003 Michael Niedermayer
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdint.h>
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#include <string.h>
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#include "libavutil/avassert.h"
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#include "libavutil/atomic.h"
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#include "libavutil/mem.h"
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#include "internal.h"
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#include "parser.h"
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static AVCodecParser *av_first_parser = NULL;
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AVCodecParser *av_parser_next(const AVCodecParser *p)
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{
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if (p)
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return p->next;
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else
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return av_first_parser;
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}
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void av_register_codec_parser(AVCodecParser *parser)
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{
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do {
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parser->next = av_first_parser;
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} while (parser->next != avpriv_atomic_ptr_cas((void * volatile *)&av_first_parser, parser->next, parser));
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}
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AVCodecParserContext *av_parser_init(int codec_id)
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{
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AVCodecParserContext *s = NULL;
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AVCodecParser *parser;
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int ret;
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if (codec_id == AV_CODEC_ID_NONE)
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return NULL;
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for (parser = av_first_parser; parser; parser = parser->next) {
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if (parser->codec_ids[0] == codec_id ||
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parser->codec_ids[1] == codec_id ||
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parser->codec_ids[2] == codec_id ||
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parser->codec_ids[3] == codec_id ||
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parser->codec_ids[4] == codec_id)
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goto found;
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}
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return NULL;
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found:
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s = av_mallocz(sizeof(AVCodecParserContext));
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if (!s)
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goto err_out;
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s->parser = parser;
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s->priv_data = av_mallocz(parser->priv_data_size);
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if (!s->priv_data)
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goto err_out;
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s->fetch_timestamp=1;
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s->pict_type = AV_PICTURE_TYPE_I;
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if (parser->parser_init) {
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ret = parser->parser_init(s);
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if (ret != 0)
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goto err_out;
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}
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s->key_frame = -1;
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s->convergence_duration = 0;
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s->dts_sync_point = INT_MIN;
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s->dts_ref_dts_delta = INT_MIN;
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s->pts_dts_delta = INT_MIN;
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s->format = -1;
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return s;
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err_out:
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if (s)
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av_freep(&s->priv_data);
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av_free(s);
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return NULL;
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}
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void ff_fetch_timestamp(AVCodecParserContext *s, int off, int remove, int fuzzy)
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{
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int i;
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if (!fuzzy) {
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s->dts =
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s->pts = AV_NOPTS_VALUE;
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s->pos = -1;
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s->offset = 0;
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}
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for (i = 0; i < AV_PARSER_PTS_NB; i++) {
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if (s->cur_offset + off >= s->cur_frame_offset[i] &&
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(s->frame_offset < s->cur_frame_offset[i] ||
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(!s->frame_offset && !s->next_frame_offset)) && // first field/frame
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// check disabled since MPEG-TS does not send complete PES packets
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/*s->next_frame_offset + off <*/ s->cur_frame_end[i]){
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if (!fuzzy || s->cur_frame_dts[i] != AV_NOPTS_VALUE) {
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s->dts = s->cur_frame_dts[i];
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s->pts = s->cur_frame_pts[i];
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s->pos = s->cur_frame_pos[i];
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s->offset = s->next_frame_offset - s->cur_frame_offset[i];
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}
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if (remove)
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s->cur_frame_offset[i] = INT64_MAX;
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if (s->cur_offset + off < s->cur_frame_end[i])
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break;
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}
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}
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}
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int av_parser_parse2(AVCodecParserContext *s, AVCodecContext *avctx,
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uint8_t **poutbuf, int *poutbuf_size,
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const uint8_t *buf, int buf_size,
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int64_t pts, int64_t dts, int64_t pos)
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{
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int index, i;
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uint8_t dummy_buf[AV_INPUT_BUFFER_PADDING_SIZE];
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if (!(s->flags & PARSER_FLAG_FETCHED_OFFSET)) {
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s->next_frame_offset =
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s->cur_offset = pos;
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s->flags |= PARSER_FLAG_FETCHED_OFFSET;
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}
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if (buf_size == 0) {
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/* padding is always necessary even if EOF, so we add it here */
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memset(dummy_buf, 0, sizeof(dummy_buf));
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buf = dummy_buf;
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} else if (s->cur_offset + buf_size != s->cur_frame_end[s->cur_frame_start_index]) { /* skip remainder packets */
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/* add a new packet descriptor */
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i = (s->cur_frame_start_index + 1) & (AV_PARSER_PTS_NB - 1);
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s->cur_frame_start_index = i;
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s->cur_frame_offset[i] = s->cur_offset;
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s->cur_frame_end[i] = s->cur_offset + buf_size;
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s->cur_frame_pts[i] = pts;
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s->cur_frame_dts[i] = dts;
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s->cur_frame_pos[i] = pos;
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}
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if (s->fetch_timestamp) {
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s->fetch_timestamp = 0;
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s->last_pts = s->pts;
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s->last_dts = s->dts;
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s->last_pos = s->pos;
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ff_fetch_timestamp(s, 0, 0, 0);
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}
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/* WARNING: the returned index can be negative */
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index = s->parser->parser_parse(s, avctx, (const uint8_t **) poutbuf,
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poutbuf_size, buf, buf_size);
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av_assert0(index > -0x20000000); // The API does not allow returning AVERROR codes
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/* update the file pointer */
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if (*poutbuf_size) {
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/* fill the data for the current frame */
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s->frame_offset = s->next_frame_offset;
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/* offset of the next frame */
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s->next_frame_offset = s->cur_offset + index;
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s->fetch_timestamp = 1;
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}
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if (index < 0)
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index = 0;
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s->cur_offset += index;
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return index;
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}
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int av_parser_change(AVCodecParserContext *s, AVCodecContext *avctx,
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uint8_t **poutbuf, int *poutbuf_size,
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const uint8_t *buf, int buf_size, int keyframe)
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{
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if (s && s->parser->split) {
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if (avctx->flags & AV_CODEC_FLAG_GLOBAL_HEADER ||
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avctx->flags2 & AV_CODEC_FLAG2_LOCAL_HEADER) {
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int i = s->parser->split(avctx, buf, buf_size);
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buf += i;
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buf_size -= i;
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}
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}
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/* cast to avoid warning about discarding qualifiers */
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*poutbuf = (uint8_t *) buf;
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*poutbuf_size = buf_size;
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if (avctx->extradata) {
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if (keyframe && (avctx->flags2 & AV_CODEC_FLAG2_LOCAL_HEADER)) {
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int size = buf_size + avctx->extradata_size;
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*poutbuf_size = size;
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*poutbuf = av_malloc(size + AV_INPUT_BUFFER_PADDING_SIZE);
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if (!*poutbuf)
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return AVERROR(ENOMEM);
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memcpy(*poutbuf, avctx->extradata, avctx->extradata_size);
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memcpy(*poutbuf + avctx->extradata_size, buf,
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buf_size + AV_INPUT_BUFFER_PADDING_SIZE);
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return 1;
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}
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}
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return 0;
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}
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void av_parser_close(AVCodecParserContext *s)
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{
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if (s) {
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if (s->parser->parser_close)
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s->parser->parser_close(s);
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av_freep(&s->priv_data);
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av_free(s);
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}
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}
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int ff_combine_frame(ParseContext *pc, int next,
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const uint8_t **buf, int *buf_size)
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{
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if (pc->overread) {
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ff_dlog(NULL, "overread %d, state:%X next:%d index:%d o_index:%d\n",
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pc->overread, pc->state, next, pc->index, pc->overread_index);
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ff_dlog(NULL, "%X %X %X %X\n",
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(*buf)[0], (*buf)[1], (*buf)[2], (*buf)[3]);
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}
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/* Copy overread bytes from last frame into buffer. */
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for (; pc->overread > 0; pc->overread--)
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pc->buffer[pc->index++] = pc->buffer[pc->overread_index++];
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/* flush remaining if EOF */
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if (!*buf_size && next == END_NOT_FOUND)
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next = 0;
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pc->last_index = pc->index;
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/* copy into buffer end return */
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if (next == END_NOT_FOUND) {
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void *new_buffer = av_fast_realloc(pc->buffer, &pc->buffer_size,
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*buf_size + pc->index +
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AV_INPUT_BUFFER_PADDING_SIZE);
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if (!new_buffer) {
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av_log(NULL, AV_LOG_ERROR, "Failed to reallocate parser buffer to %d\n", *buf_size + pc->index + AV_INPUT_BUFFER_PADDING_SIZE);
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pc->index = 0;
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return AVERROR(ENOMEM);
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}
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pc->buffer = new_buffer;
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memcpy(&pc->buffer[pc->index], *buf, *buf_size);
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pc->index += *buf_size;
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return -1;
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}
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*buf_size =
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pc->overread_index = pc->index + next;
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/* append to buffer */
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if (pc->index) {
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void *new_buffer = av_fast_realloc(pc->buffer, &pc->buffer_size,
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next + pc->index +
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AV_INPUT_BUFFER_PADDING_SIZE);
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if (!new_buffer) {
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av_log(NULL, AV_LOG_ERROR, "Failed to reallocate parser buffer to %d\n", next + pc->index + AV_INPUT_BUFFER_PADDING_SIZE);
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pc->overread_index =
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pc->index = 0;
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return AVERROR(ENOMEM);
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}
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pc->buffer = new_buffer;
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if (next > -AV_INPUT_BUFFER_PADDING_SIZE)
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memcpy(&pc->buffer[pc->index], *buf,
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next + AV_INPUT_BUFFER_PADDING_SIZE);
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pc->index = 0;
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*buf = pc->buffer;
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}
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/* store overread bytes */
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for (; next < 0; next++) {
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pc->state = pc->state << 8 | pc->buffer[pc->last_index + next];
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pc->state64 = pc->state64 << 8 | pc->buffer[pc->last_index + next];
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pc->overread++;
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}
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if (pc->overread) {
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ff_dlog(NULL, "overread %d, state:%X next:%d index:%d o_index:%d\n",
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pc->overread, pc->state, next, pc->index, pc->overread_index);
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ff_dlog(NULL, "%X %X %X %X\n",
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(*buf)[0], (*buf)[1], (*buf)[2], (*buf)[3]);
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}
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return 0;
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}
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void ff_parse_close(AVCodecParserContext *s)
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{
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ParseContext *pc = s->priv_data;
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av_freep(&pc->buffer);
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}
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int ff_mpeg4video_split(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
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{
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uint32_t state = -1;
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const uint8_t *ptr = buf, *end = buf + buf_size;
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while (ptr < end) {
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ptr = avpriv_find_start_code(ptr, end, &state);
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if (state == 0x1B3 || state == 0x1B6)
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return ptr - 4 - buf;
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}
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return 0;
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}
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