diff options
Diffstat (limited to 'media/ffvpx/libavcodec/parser.c')
| -rw-r--r-- | media/ffvpx/libavcodec/parser.c | 340 |
1 files changed, 340 insertions, 0 deletions
diff --git a/media/ffvpx/libavcodec/parser.c b/media/ffvpx/libavcodec/parser.c new file mode 100644 index 000000000..2c8fc6904 --- /dev/null +++ b/media/ffvpx/libavcodec/parser.c @@ -0,0 +1,340 @@ +/* + * 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/internal.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; +#if FF_API_CONVERGENCE_DURATION +FF_DISABLE_DEPRECATION_WARNINGS + s->convergence_duration = 0; +FF_ENABLE_DEPRECATION_WARNINGS +#endif + 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]; + } + 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[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; + 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; +} |