diff options
Diffstat (limited to 'libavcodec/parser.c')
-rw-r--r-- | libavcodec/parser.c | 111 |
1 files changed, 68 insertions, 43 deletions
diff --git a/libavcodec/parser.c b/libavcodec/parser.c index 355187a..2c8fc69 100644 --- a/libavcodec/parser.c +++ b/libavcodec/parser.c @@ -3,26 +3,28 @@ * Copyright (c) 2003 Fabrice Bellard * Copyright (c) 2003 Michael Niedermayer * - * This file is part of Libav. + * This file is part of FFmpeg. * - * Libav is free software; you can redistribute it and/or + * 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. * - * Libav is distributed in the hope that it will be useful, + * 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 Libav; if not, write to the Free Software + * 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/internal.h" #include "libavutil/mem.h" @@ -41,20 +43,21 @@ AVCodecParser *av_parser_next(const AVCodecParser *p) void av_register_codec_parser(AVCodecParser *parser) { - parser->next = av_first_parser; - av_first_parser = 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; + 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) { + 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 || @@ -67,25 +70,18 @@ AVCodecParserContext *av_parser_init(int codec_id) found: s = av_mallocz(sizeof(AVCodecParserContext)); if (!s) - return NULL; + goto err_out; s->parser = parser; - if (parser->priv_data_size) { - s->priv_data = av_mallocz(parser->priv_data_size); - if (!s->priv_data) { - av_free(s); - return NULL; - } - } + 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) { - av_free(s->priv_data); - av_free(s); - return NULL; - } + if (ret != 0) + goto err_out; } - s->fetch_timestamp = 1; - s->pict_type = AV_PICTURE_TYPE_I; s->key_frame = -1; #if FF_API_CONVERGENCE_DURATION FF_DISABLE_DEPRECATION_WARNINGS @@ -98,25 +94,37 @@ FF_ENABLE_DEPRECATION_WARNINGS 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) +void ff_fetch_timestamp(AVCodecParserContext *s, int off, int remove, int fuzzy) { int i; - s->dts = - s->pts = AV_NOPTS_VALUE; - s->pos = -1; - s->offset = 0; + 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)) && - 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]; + (!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]; + } if (remove) s->cur_frame_offset[i] = INT64_MAX; if (s->cur_offset + off < s->cur_frame_end[i]) @@ -133,6 +141,15 @@ int av_parser_parse2(AVCodecParserContext *s, AVCodecContext *avctx, int index, i; uint8_t dummy_buf[AV_INPUT_BUFFER_PADDING_SIZE]; + av_assert1(avctx->codec_id != AV_CODEC_ID_NONE); + + /* Parsers only work for the specified codec ids. */ + av_assert1(avctx->codec_id == s->parser->codec_ids[0] || + avctx->codec_id == s->parser->codec_ids[1] || + avctx->codec_id == s->parser->codec_ids[2] || + avctx->codec_id == s->parser->codec_ids[3] || + avctx->codec_id == s->parser->codec_ids[4]); + if (!(s->flags & PARSER_FLAG_FETCHED_OFFSET)) { s->next_frame_offset = s->cur_offset = pos; @@ -159,11 +176,12 @@ int av_parser_parse2(AVCodecParserContext *s, AVCodecContext *avctx, s->last_pts = s->pts; s->last_dts = s->dts; s->last_pos = s->pos; - ff_fetch_timestamp(s, 0, 0); + 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 */ @@ -219,7 +237,7 @@ void av_parser_close(AVCodecParserContext *s) if (s) { if (s->parser->parser_close) s->parser->parser_close(s); - av_free(s->priv_data); + av_freep(&s->priv_data); av_free(s); } } @@ -250,8 +268,11 @@ int ff_combine_frame(ParseContext *pc, int next, *buf_size + pc->index + AV_INPUT_BUFFER_PADDING_SIZE); - if (!new_buffer) + 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; @@ -266,9 +287,12 @@ int ff_combine_frame(ParseContext *pc, int next, void *new_buffer = av_fast_realloc(pc->buffer, &pc->buffer_size, next + pc->index + AV_INPUT_BUFFER_PADDING_SIZE); - - if (!new_buffer) + 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, @@ -303,13 +327,14 @@ void ff_parse_close(AVCodecParserContext *s) int ff_mpeg4video_split(AVCodecContext *avctx, const uint8_t *buf, int buf_size) { - int i; uint32_t state = -1; + const uint8_t *ptr = buf, *end = buf + buf_size; - for (i = 0; i < buf_size; i++) { - state = state << 8 | buf[i]; + while (ptr < end) { + ptr = avpriv_find_start_code(ptr, end, &state); if (state == 0x1B3 || state == 0x1B6) - return i - 3; + return ptr - 4 - buf; } + return 0; } |