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FFmpeg
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Functions responsible for allocating, freeing, and copying memory. More...
Functions | |
| void * | av_malloc (size_t size) av_malloc_attrib 1(1) |
| Allocate a memory block with alignment suitable for all memory accesses (including vectors if available on the CPU). More... | |
| void * | av_mallocz (size_t size) av_malloc_attrib 1(1) |
| Allocate a memory block with alignment suitable for all memory accesses (including vectors if available on the CPU) and zero all the bytes of the block. More... | |
| static void * | av_malloc_array (size_t nmemb, size_t size) |
| static void * | av_mallocz_array (size_t nmemb, size_t size) |
| void * | av_calloc (size_t nmemb, size_t size) av_malloc_attrib |
| Non-inlined equivalent of av_mallocz_array(). More... | |
| void * | av_realloc (void *ptr, size_t size) 1(2) |
| Allocate, reallocate, or free a block of memory. More... | |
| av_warn_unused_result int | av_reallocp (void *ptr, size_t size) |
| Allocate, reallocate, or free a block of memory through a pointer to a pointer. More... | |
| void * | av_realloc_f (void *ptr, size_t nelem, size_t elsize) |
| Allocate, reallocate, or free a block of memory. More... | |
| void * | av_realloc_array (void *ptr, size_t nmemb, size_t size) |
| int | av_reallocp_array (void *ptr, size_t nmemb, size_t size) |
| void * | av_fast_realloc (void *ptr, unsigned int *size, size_t min_size) |
| Reallocate the given buffer if it is not large enough, otherwise do nothing. More... | |
| void | av_fast_malloc (void *ptr, unsigned int *size, size_t min_size) |
| Allocate a buffer, reusing the given one if large enough. More... | |
| void | av_fast_mallocz (void *ptr, unsigned int *size, size_t min_size) |
| Allocate and clear a buffer, reusing the given one if large enough. More... | |
| void | av_free (void *ptr) |
| Free a memory block which has been allocated with a function of av_malloc() or av_realloc() family. More... | |
| void | av_freep (void *ptr) |
Free a memory block which has been allocated with a function of av_malloc() or av_realloc() family, and set the pointer pointing to it to NULL. More... | |
| char * | av_strdup (const char *s) av_malloc_attrib |
| Duplicate a string. More... | |
| char * | av_strndup (const char *s, size_t len) av_malloc_attrib |
| Duplicate a substring of a string. More... | |
| void * | av_memdup (const void *p, size_t size) |
| Duplicate a buffer with av_malloc(). More... | |
| void | av_memcpy_backptr (uint8_t *dst, int back, int cnt) |
| Overlapping memcpy() implementation. More... | |
Functions responsible for allocating, freeing, and copying memory.
All memory allocation functions have a built-in upper limit of INT_MAX bytes. This may be changed with av_max_alloc(), although exercise extreme caution when doing so.
| void* av_malloc | ( | size_t | size | ) |
Allocate a memory block with alignment suitable for all memory accesses (including vectors if available on the CPU).
| size | Size in bytes for the memory block to be allocated |
NULL if the block cannot be allocated Definition at line 77 of file mem.c.
Referenced by av_malloc(), av_malloc_array(), av_mallocz(), and av_memdup().
| void* av_mallocz | ( | size_t | size | ) |
Allocate a memory block with alignment suitable for all memory accesses (including vectors if available on the CPU) and zero all the bytes of the block.
| size | Size in bytes for the memory block to be allocated |
NULL if it cannot be allocated Definition at line 222 of file mem.c.
Referenced by a64multi_encode_init(), aac_adtstoasc_filter(), aac_decode_frame(), aac_encode_init(), add_av_stream1(), add_codec(), add_fragment(), add_input_streams(), add_pes_stream(), add_segment(), add_to_pktbuf(), add_to_queue(), aiff_write_packet(), alac_encode_init(), allocate_buffers(), allocate_tables(), ape_read_header(), apng_write_header(), asf_read_picture(), asf_read_stream_properties(), ass_decode_frame(), atrac3_decode_init(), av_abuffersink_params_alloc(), av_aes_alloc(), av_aes_ctr_alloc(), av_audio_fifo_alloc(), av_audio_resample_init(), av_bitstream_filter_filter(), av_bitstream_filter_init(), av_blowfish_alloc(), av_bsf_alloc(), av_bsf_list_alloc(), av_buffer_create(), av_buffer_pool_init(), av_buffer_pool_init2(), av_buffer_ref(), av_buffersrc_parameters_alloc(), av_calloc(), av_camellia_alloc(), av_cast5_alloc(), av_cpb_properties_alloc(), av_des_alloc(), av_dict_set(), av_dump_format(), av_expr_parse(), av_fft_init(), av_frame_alloc(), av_hash_alloc(), av_hmac_alloc(), av_hwdevice_ctx_alloc(), av_hwdevice_get_hwframe_constraints(), av_hwdevice_hwconfig_alloc(), av_hwframe_ctx_alloc(), av_mallocz_array(), av_mastering_display_metadata_alloc(), av_md5_alloc(), av_murmur3_alloc(), av_new_program(), av_opencl_alloc_external_env(), av_opencl_get_device_list(), av_opt_query_ranges_default(), av_packet_alloc(), av_packet_new_side_data(), av_packet_split_side_data(), av_parser_init(), av_rc4_alloc(), av_resample_init(), av_ripemd_alloc(), av_sha512_alloc(), av_sha_alloc(), av_spherical_alloc(), av_stereo3d_alloc(), av_tea_alloc(), av_thread_message_queue_alloc(), av_tree_node_alloc(), av_twofish_alloc(), av_vdpau_alloc_context(), av_vorbis_parse_init(), av_xtea_alloc(), avcodec_dct_alloc(), avcodec_open2(), avcodec_parameters_alloc(), avcodec_parameters_copy(), avcodec_parameters_from_context(), avcodec_parameters_to_context(), avdevice_capabilities_create(), avdevice_list_devices(), avfilter_graph_alloc(), avfilter_graph_queue_command(), avfilter_inout_alloc(), avfilter_link(), avformat_alloc_context(), avformat_alloc_output_context2(), avformat_find_stream_info(), avformat_new_stream(), avformat_open_input(), avi_read_header(), avi_write_header(), avio_alloc_context(), avio_open_dir(), avpriv_ac3_parse_header(), avpriv_dv_init_demux(), avpriv_float_dsp_alloc(), avpriv_mpegts_parse_open(), avpriv_new_chapter(), avresample_alloc_context(), avui_encode_init(), bfi_decode_init(), callback(), che_configure(), check_add_bytes(), check_field_queue(), compute_mask(), config_output(), cook_decode_init(), copy_chapters(), cuda_device_init(), D(), daala_header(), dash_init(), decode_dvd_subtitles(), decode_extradata_ps_mp4(), decode_frame(), decode_init(), decode_pic(), DEF_CHOOSE_FORMAT(), dfa_decode_init(), display_end_segment(), doTest(), dss_read_metadata_string(), dv_read_timecode(), dvbsub_parse_display_definition_segment(), dvbsub_parse_page_segment(), dvbsub_parse_region_segment(), dxva2_alloc(), dxva2_device_create(), dxva2_map_frame(), encode_frame(), encode_init(), encode_picture_ls(), enqueue_packet(), epic_add_pixel_to_cache(), ff_all_channel_counts(), ff_all_channel_layouts(), ff_all_samplerates(), ff_alloc_a53_sei(), ff_alloc_dir_entry(), ff_alloc_input_device_context(), ff_alsa_get_device_list(), ff_AMediaCodec_createCodecByName(), ff_AMediaCodec_createDecoderByType(), ff_AMediaCodec_createEncoderByType(), ff_AMediaFormat_new(), ff_AMediaFormat_newFromObject(), ff_ass_add_rect(), ff_ass_split(), ff_ass_split_dialog2(), ff_audio_data_alloc(), ff_audio_mix_alloc(), ff_audio_resample_init(), ff_avc_write_annexb_extradata(), ff_cavs_init_top_lines(), ff_celt_init(), ff_decklink_read_header(), ff_decklink_write_header(), ff_dither_alloc(), ff_ebur128_init(), ff_fast_malloc(), ff_fbdev_get_device_list(), ff_ffv1_init_slice_contexts(), ff_filter_alloc(), ff_frame_pool_audio_init(), ff_frame_pool_video_init(), ff_frame_thread_encoder_init(), ff_frame_thread_init(), ff_graph_thread_init(), ff_hevc_decode_nal_pps(), ff_hwframe_map_create(), ff_iir_filter_init_state(), ff_init_vscale(), ff_interleave_add_packet(), ff_intrax8_common_init(), ff_ivi_init_planes(), ff_jpegls_decode_picture(), ff_lpc_init(), ff_lzw_decode_open(), ff_mdct15_init(), ff_merge_channel_layouts(), ff_mjpeg_encode_init(), ff_mpeg_er_init(), ff_nut_add_sp(), ff_parse_mpeg2_descriptor(), ff_pca_init(), ff_psy_preprocess_init(), ff_rate_control_init(), ff_rdt_parse_open(), ff_read_riff_info(), ff_rfps_add_frame(), ff_rm_alloc_rmstream(), ff_rtp_parse_open(), ff_rtsp_setup_output_streams(), ff_schro_queue_push_back(), ff_silk_init(), ff_slice_thread_init(), ff_timefilter_new(), ff_vaapi_encode_init(), ff_vc1_decode_init_alloc_tables(), ff_vs_init(), ff_wms_parse_sdp_a_line(), ffat_init_encoder(), ffio_fdopen(), ffm2_read_header(), ffm_read_header(), ffmal_update_format(), ffmmal_add_packet(), ffmmal_set_ref(), ffserver_parse_acl_row(), ffserver_parse_config_feed(), ffserver_parse_config_redirect(), ffserver_parse_config_stream(), fifo_alloc_common(), filter_frame(), find_component(), find_headers_search_validate(), flac_read_header(), flashsv2_encode_init(), flashsv_decode_frame(), flashsv_encode_frame(), flashsv_encode_init(), flush_packet(), flv_queue_extradata(), flv_write_header(), flv_write_packet(), frame_new_side_data(), g2m_init_buffers(), gen_sub_bitmap(), generate_fake_vps(), generate_joint_tables(), get_buffer(), get_buffer2(), get_device_list(), get_free_frame(), get_http_header_data(), get_private_data(), get_siz(), get_surface(), gif_encode_init(), gxf_write_header(), handle_file(), handler(), hevc_init_context(), hls_slice_data_wpp(), hnm_decode_init(), hnm_read_header(), htmlencode(), iec61883_callback(), init(), init_bundles(), init_complex_filtergraph(), init_context_defaults(), init_fps(), init_input_filter(), init_muxer(), init_output_stream(), init_pts(), lavfi_read_header(), libkvazaar_init(), libschroedinger_encode_frame(), link_filter_inouts(), load_glyph(), main(), make_eval_expr(), make_field_queue(), make_point(), matroska_parse_frame(), matroska_parse_laces(), matroska_parse_rm_audio(), matroska_parse_tracks(), matroska_parse_webvtt(), mediacodec_decode_init(), mediacodec_wrap_hw_buffer(), mkv_start_cues(), mkv_start_seekhead(), mkv_write_attachments(), mkv_write_header(), mmsh_open_internal(), mmsh_read_seek(), mov_read_chapters(), mov_read_covr(), mov_read_dref(), mov_read_keys(), mov_read_sidx(), mov_read_stsd(), mov_read_trak(), mov_read_udta_string(), mov_read_uuid(), mov_read_wave(), mov_rewrite_dvd_sub_extradata(), mov_text_encode_init(), mov_text_tx3g(), mov_write_dvc1_structs(), mov_write_single_packet(), mp3_write_packet(), mpeg_mux_init(), mpeg_mux_write_packet(), mpegts_add_service(), mpegts_init(), mpegts_open_filter(), mss2_decode_init(), mxf_handle_missing_index_segment(), mxf_parse_package_comments(), mxf_read_local_tags(), mxf_uid_to_str(), mxf_umid_to_str(), mxf_write_header(), mxpeg_decode_mxm(), new_connection(), new_init_section(), new_output_stream(), new_playlist(), new_rendition(), new_stream(), new_variant(), new_video_stream(), nsv_parse_NSVf_header(), nsv_parse_NSVs_header(), nvenc_setup_extradata(), ogg_buffer_page(), ogg_build_flac_headers(), ogg_build_opus_headers(), ogg_build_speex_headers(), ogg_build_vp8_headers(), ogg_save(), ogg_write_header(), ogg_write_vorbiscomment(), omx_component_init(), omx_init(), opaque_list_push(), open_input_file(), open_output_file(), opt_channel_layout(), opt_filter_complex(), opt_filter_complex_script(), opus_header(), paf_video_init(), parse_dynamic_acl(), parse_fmtp_config(), parse_inputs(), parse_keyframes_index(), parse_primary(), parse_sws_flags(), parse_vtrk(), pic_arrays_init(), pool_alloc_buffer(), pp_get_context(), prepare_sdp_description(), process_output_surface(), psy_3gpp_init(), pthread_cond_init(), pulse_add_detected_device(), put_main_header(), qsv_decode(), qsv_device_create(), qt_rtp_parse_packet(), qtrle_encode_init(), rdt_parse_b64buf(), read_apic(), read_gab2_sub(), read_geobtag(), read_header(), read_packet(), read_priv(), read_tfra(), reallocAlign(), resample_init(), rl2_decode_init(), rtp_new_connection(), rtp_parse_addr_list(), rv34_decoder_alloc(), sap_write_header(), segment_end(), set_encoder_id(), set_extradata(), setup_hwaccel(), smacker_decode_header_tree(), smka_decode_frame(), sp5x_decode_frame(), speex_header(), stream_open(), svc_encode_init(), svq1_encode_init(), svq1_encode_plane(), svq3_decode_init(), swr_alloc(), swri_rematrix_init(), sws_alloc_context(), tgv_decode_frame(), theora_header(), update_block_buffers(), update_dimensions(), url_alloc_for_protocol(), url_open_dyn_buf_internal(), utvideo_encode_init(), v4l2_get_device_list(), vaapi_decode_init(), vaapi_device_create(), vaapi_encode_alloc(), vaapi_encode_h264_init_slice_params(), vaapi_encode_h265_init_slice_params(), vaapi_encode_issue(), vaapi_vc1_start_frame(), vc1_decode_frame(), vc1_decode_init(), vc2_encode_init(), vda_old_h264_end_frame(), vdpau_alloc(), videostream_cb(), videotoolbox_init(), vorbis_header(), vorbis_parse_setup_hdr_codebooks(), vorbis_parse_setup_hdr_floors(), vorbis_parse_setup_hdr_mappings(), vorbis_parse_setup_hdr_modes(), vorbis_parse_setup_hdr_residues(), vp6_decode_init(), vqa_decode_init(), vtenc_send_frame(), wmv2_encode_init(), worker(), wrapped_avframe_encode(), write_packet(), writer_open(), wtvfile_open_sector(), wv_alloc_frame_context(), X264_frame(), and X264_init().
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inlinestatic |
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inlinestatic |
Definition at line 229 of file mem.h.
Referenced by a64multi_encode_init(), alloc_buffers(), alloc_sequence_buffers(), alloc_slice(), allocate_buffers(), allocate_tables(), atrac3_decode_init(), atrac3p_decode_init(), audio_get_buffer(), av_audio_fifo_alloc(), av_frame_ref(), av_resample_init(), avcodec_fill_audio_frame(), channelmap_filter_frame(), check_stream_max_drift(), cng_decode_init(), compute_mask(), config_input(), config_input_ref(), config_output(), copy_separable_masks(), D(), decode_entropy_coded_image(), decode_init(), decode_picture_header(), dejudder_init(), display_end_segment(), dnxhd_decode_init(), dnxhd_decode_init_thread_copy(), dxva2_init_pool(), encode_init(), ff_alloc_entries(), ff_cavs_init_top_lines(), ff_ebur128_init(), ff_ffv1_init_slice_state(), ff_filter_alloc(), ff_frame_pool_get(), ff_frame_thread_init(), ff_init_filters(), ff_init_vscale(), ff_ivi_init_planes(), ff_ivi_init_tiles(), ff_jpeg2000_init_component(), ff_jpeg2000_tag_tree_init(), ff_mjpeg_decode_sof(), ff_mlz_init_dict(), ff_opus_parse_extradata(), ff_png_zalloc(), ff_psy_init(), ff_psy_preprocess_init(), ff_qsv_enc_init(), ff_slice_buffer_init(), ff_slice_thread_init(), ff_snow_alloc_blocks(), ff_snow_common_init_after_header(), ff_stream_encode_params_copy(), ffserver_parse_config_feed(), ffurl_get_protocols(), find_component(), frame_alloc(), g2m_init_buffers(), g722_encode_init(), get_audio_buffer(), get_buffer(), get_device_list(), get_siz(), h264_init_context(), hds_write_header(), http_server(), huf_uncompress(), hwframe_pool_prealloc(), ico_write_header(), init(), init_band(), init_out_session(), init_parse_context(), init_pattern_from_string(), init_prec(), init_tiles(), ism_write_header(), ivi_init_tiles(), join_config_output(), join_init(), libopus_encode_init(), main(), mkv_write_header(), mov_init(), mov_read_sidx(), mov_read_stsd(), mp_decode_init(), mxf_compute_index_tables(), new_output_stream(), nvenc_setup_surfaces(), open_input_file(), open_output_file(), opus_decode_init(), pic_arrays_init(), psy_3gpp_init(), qsv_create_mids(), qsv_frames_init(), qsv_init_pool(), qsv_setup_mids(), qtrle_encode_init(), read_huffman_code_normal(), read_shape_from_file(), read_tfra(), ready_codebook(), ready_residue(), roq_encode_init(), rtsp_read_header(), sap_write_header(), setup_find_stream_info_opts(), smacker_decode_header_tree(), swri_realloc_audio(), tee_write_header(), thread_init_internal(), tiff_decode_tag(), try_push_frame(), var_size_bme(), vorbis_parse_id_hdr(), vorbis_parse_setup_hdr_codebooks(), vorbis_parse_setup_hdr_floors(), vorbis_parse_setup_hdr_mappings(), XAVS_init(), and xmv_read_header().
| void* av_calloc | ( | size_t | nmemb, |
| size_t | size | ||
| ) |
Non-inlined equivalent of av_mallocz_array().
Created for symmetry with the calloc() C function.
Definition at line 230 of file mem.c.
Referenced by add_filter(), alloc_metrics(), av_samples_alloc_array_and_samples(), config_audio_output(), config_input(), config_input0(), config_output(), config_props(), config_video_output(), connect_ports(), decode_init(), decode_main_header(), encode_dvd_subtitles(), ff_dirac_golomb_reader_init(), ff_framesync_init(), ff_pca_init(), ff_vc2enc_init_transforms(), get_codecs_sorted(), get_frame(), get_histogram(), graph_config_pointers(), init(), init_cqt(), init_pattern_from_file(), interpolate(), load_data(), load_sofa(), main(), movie_common_init(), mxf_compute_ptses_fake_index(), mxf_get_sorted_table_segments(), mxf_read_index_entry_array(), mxf_read_primer_pack(), mxf_read_strong_ref_array(), nut_write_header(), open_slave(), parse_mapping(), rebuild_filter_bank_with_compensation(), resample_init(), set_enable_expr(), swri_rematrix_init(), tm2_build_huff_table(), vc2_encode_init(), and wavesynth_parse_extradata().
Allocate, reallocate, or free a block of memory.
If ptr is NULL and size > 0, allocate a new block. If size is zero, free the memory block pointed to by ptr. Otherwise, expand or shrink that block of memory according to size.
| ptr | Pointer to a memory block already allocated with av_realloc() or NULL |
| size | Size in bytes of the memory block to be allocated or reallocated |
NULL if the block cannot be reallocated or the function is used to free the memory blockDefinition at line 135 of file mem.c.
Referenced by add_file(), append_extradata(), av_bprint_alloc(), av_bprint_finalize(), av_buffer_realloc(), av_dict_set(), av_fast_realloc(), av_packet_add_side_data(), av_packet_pack_dictionary(), av_realloc_array(), av_realloc_f(), av_reallocp(), av_strdup(), av_stream_add_side_data(), av_strndup(), avfilter_graph_alloc_filter(), concat_open(), decode_frame(), decode_header(), draw_text(), epic_hash_add(), ff_els_decode_unsigned(), ff_h264_parse_sprop_parameter_sets(), ff_img_read_header(), ff_rtmp_packet_create(), ff_vs_init(), fixup_vorbis_headers(), frame_new_side_data(), get_qt_codec(), huf_build_dec_table(), load_textfile(), main(), match_streams(), matroska_decode_buffer(), matroska_deliver_packet(), matroska_parse_wavpack(), mov_fix_index(), mov_read_ctts(), mov_read_trun(), nut_read_header(), ogg_new_stream(), parse_adaptation_sets(), probe_codec(), qt_rtp_parse_packet(), and xmlescape().
| av_warn_unused_result int av_reallocp | ( | void * | ptr, |
| size_t | size | ||
| ) |
Allocate, reallocate, or free a block of memory through a pointer to a pointer.
If *ptr is NULL and size > 0, allocate a new block. If size is zero, free the memory block pointed to by *ptr. Otherwise, expand or shrink that block of memory according to size.
| [in,out] | ptr | Pointer to a pointer to a memory block already allocated with av_realloc(), or a pointer to NULL. The pointer is updated on success, or freed on failure. |
| [in] | size | Size in bytes for the memory block to be allocated or reallocated |
Definition at line 163 of file mem.c.
Referenced by add_fragment(), add_segment(), add_tracked_method(), append_flv_data(), asfrtp_parse_packet(), auxiliary_info_alloc_size(), av_probe_input_buffer2(), av_vdpau_bind_context(), avi_read_header(), bmv_read_packet(), concat_open(), concatenate_packet(), daala_header(), decode_frame(), decode_registered_user_data_closed_caption(), dxv_decode(), dyn_buf_write(), ff_lzf_uncompress(), ffm_append_recommended_configuration(), fixup_vorbis_headers(), flashsv_decode_frame(), g2m_load_cursor(), get_tcp_server_response(), h264_extradata_to_annexb(), handle_metadata(), hap_decode(), hevc_extradata_to_annexb(), http_open(), jpg_decode_data(), libschroedinger_encode_frame(), mov_cenc_end_packet(), mov_realloc_extradata(), omx_encode_frame(), omx_encode_init(), parse_icy(), qt_rtp_parse_packet(), queue_frames(), rdt_parse_sdp_line(), realloc_buffer(), rtmp_http_write(), rtmp_open(), rtmp_write(), set_segment_filename(), smacker_read_packet(), tdsc_decode_frame(), tdsc_decode_tiles(), tdsc_init(), tdsc_load_cursor(), tgv_decode_inter(), theora_header(), tls_client_handshake_loop(), tls_read(), and vpx_init().
Allocate, reallocate, or free a block of memory.
This function does the same thing as av_realloc(), except:
nelem * elsize bytes, after checking the result of the multiplication for integer overflow.Definition at line 148 of file mem.c.
Referenced by av_reallocp_array().
Definition at line 184 of file mem.c.
Referenced by add_serial_pair(), ass_split_section(), audio_resample(), av_program_add_stream_index(), avformat_new_stream(), decode_video(), ebml_parse_elem(), ff_add_cpb_side_data(), ff_alsa_extend_reorder_buf(), ff_ass_add_rect(), ff_framequeue_add(), ff_h2645_packet_split(), ff_insert_pad(), ff_rtmp_check_alloc_array(), ff_vaapi_decode_make_slice_buffer(), filter_frame(), grow_array(), handle_file(), handler(), init_output_stream(), log_callback(), mkv_add_cuepoint(), mkv_add_seekhead_entry(), mkv_write_attachments(), mov_read_sidx(), mxf_add_metadata_set(), mxf_read_partition_pack(), new_output_stream(), new_video_stream(), read_tfra(), realloc_section_array(), reconfigure_at_keyframe(), sample_queue_push(), tee_open(), vc1_decode_frame(), and xan_decode_frame().
Definition at line 191 of file mem.c.
Referenced by add_fragment(), add_pat_entry(), allocate_buffers(), ff_h2645_extract_rbsp(), ff_hap_set_chunk_count(), ff_mov_write_packet(), filter_frame(), gxf_write_map_packet(), gxf_write_packet(), hvcc_array_add_nal_unit(), mov_add_tfra_entries(), mov_build_index(), mov_read_trex(), mov_read_trun(), mxf_write_packet(), mxf_write_partition(), new_audio_stream(), nut_write_packet(), ogg_restore(), parse_strk(), tgv_decode_inter(), tm2_read_stream(), update_context_from_user(), update_index(), and vp56_size_changed().
Reallocate the given buffer if it is not large enough, otherwise do nothing.
If the given buffer is NULL, then a new uninitialized buffer is allocated.
If the given buffer is not large enough, and reallocation fails, NULL is returned and *size is set to 0, but the original buffer is not changed or freed.
A typical use pattern follows:
| [in,out] | ptr | Already allocated buffer, or NULL |
| [in,out] | size | Pointer to current size of buffer ptr. *size is changed to min_size in case of success or 0 in case of failure |
| [in] | min_size | New size of buffer ptr |
ptr if the buffer is large enough, a pointer to newly reallocated buffer if the buffer was not large enough, or NULL in case of error Definition at line 450 of file mem.c.
Referenced by add_ctts_entry(), add_index_entry(), caf_write_packet(), decode_frame(), decode_frame_header(), dirac_combine_frame(), ff_add_index_entry(), ff_af_queue_add(), ff_combine_frame(), ff_mms_asf_header_parser(), ff_subtitles_queue_insert(), ff_thread_release_buffer(), ff_vdpau_add_buffer(), ff_videotoolbox_h264_decode_slice(), filter_frame(), flac_fifo_read_wrap(), get_stats(), init(), intercept_id3(), mxg_update_cache(), read_frame(), shorten_decode_frame(), spdif_header_eac3(), vda_old_h264_decode_slice(), and videotoolbox_buffer_copy().
Allocate a buffer, reusing the given one if large enough.
Contrary to av_fast_realloc(), the current buffer contents might not be preserved and on error the old buffer is freed, thus no special handling to avoid memleaks is necessary.
*ptr is allowed to be NULL, in which case allocation always happens if size_needed is greater than 0.
| [in,out] | ptr | Pointer to pointer to an already allocated buffer. *ptr will be overwritten with pointer to new buffer on success or NULL on failure |
| [in,out] | size | Pointer to current size of buffer *ptr. *size is changed to min_size in case of success or 0 in case of failure |
| [in] | min_size | New size of buffer *ptr |
Definition at line 469 of file mem.c.
Referenced by alloc_scratch_buffers(), allocate_buffers(), ape_decode_frame(), audio_decode_frame(), chs_alloc_lsb_band_data(), chs_alloc_msb_band_data(), chs_assemble_freq_bands(), codec_reinit(), crypto_write(), decode_8(), decode_frame(), ff_dca_core_filter_fixed(), ff_mpeg_update_thread_context(), fic_decode_frame(), filter_frame_float(), find_motion(), gif_decode_frame(), gif_read_image(), id3v2_parse(), lag_decode_frame(), ljpeg_decode_rgb_scan(), magy_decode_frame(), opus_decode_subpacket(), parse_navi_table(), pmp_packet(), reconfigure_at_keyframe(), rscc_decode_frame(), spdif_header_dts4(), spdif_write_packet(), svq3_decode_slice_header(), tak_decode_frame(), truemotion1_decode_header(), truemotion1_decode_init(), update_init_section(), update_md5_sum(), and verify_md5().
Allocate and clear a buffer, reusing the given one if large enough.
Like av_fast_malloc(), but all newly allocated space is initially cleared. Reused buffer is not cleared.
*ptr is allowed to be NULL, in which case allocation always happens if size_needed is greater than 0.
| [in,out] | ptr | Pointer to pointer to an already allocated buffer. *ptr will be overwritten with pointer to new buffer on success or NULL on failure |
| [in,out] | size | Pointer to current size of buffer *ptr. *size is changed to min_size in case of success or 0 in case of failure |
| [in] | min_size | New size of buffer *ptr |
Definition at line 474 of file mem.c.
Referenced by alloc_sample_buffer(), alloc_scratch_buffers(), and alloc_x96_sample_buffer().
Free a memory block which has been allocated with a function of av_malloc() or av_realloc() family.
| ptr | Pointer to the memory block which should be freed. |
ptr = NULL is explicitly allowed. Definition at line 204 of file mem.c.
Referenced by av_freep(), and av_realloc_f().
Free a memory block which has been allocated with a function of av_malloc() or av_realloc() family, and set the pointer pointing to it to NULL.
| ptr | Pointer to the pointer to the memory block which should be freed |
*ptr = NULL is safe and leads to no action. Definition at line 213 of file mem.c.
Referenced by av_dynarray2_add(), av_dynarray_add(), and av_reallocp().
| char* av_strdup | ( | const char * | s | ) |
Duplicate a string.
| s | String to be duplicated |
s or NULL if the string cannot be allocated Definition at line 237 of file mem.c.
Referenced by add_av_stream(), add_codec(), add_input_streams(), add_tracked_method(), ass_decode_frame(), av_append_path_component(), av_bsf_list_parse_str(), av_dict_get_string(), av_dict_set(), av_opt_copy(), av_opt_get(), avfilter_graph_parse(), avfilter_graph_queue_command(), avfilter_init_str(), avformat_match_stream_specifier(), avformat_open_input(), avpriv_tempfile(), bsf_parse_single(), caca_write_header(), choose_pix_fmts(), cine_read_header(), config_input(), config_output(), configure_filtergraph(), convert_sub_to_old_ass_form(), curves_init(), decimate_init(), draw_curves(), ebml_parse_nest(), ff_alsa_get_device_list(), ff_copy_whiteblacklists(), ff_fbdev_get_device_list(), ff_filter_alloc(), ff_http_do_new_request(), ff_http_match_no_proxy(), ff_img_read_header(), ff_jni_jstring_to_utf_chars(), ff_mpv_encode_init(), ff_stream_encode_params_copy(), ff_tls_open_underlying(), ffio_fdopen(), ffserver_parse_config_feed(), ffserver_parse_config_stream(), ffurl_connect(), fieldmatch_init(), frei0r_init(), ftp_connect(), ftp_current_dir(), ftp_parse_entry_mlsd(), ftp_parse_entry_nlst(), geq_init(), get_cookies(), get_geokey_val(), get_opt_flags_string(), get_ost_filters(), grab_read_header(), hls_delete_old_segments(), hls_start(), hls_write_header(), hls_write_packet(), hls_write_trailer(), http_connect(), http_open(), icecast_open(), init(), init_filter(), init_filters(), initialize(), join_init(), lavfi_read_header(), libsmbc_read_dir(), libssh_read_dir(), log_callback(), main(), microdvd_read_header(), mkdir_p(), mkv_write_simpletag(), mmsh_open_internal(), movie_common_init(), mpegts_add_service(), mpjpeg_read_packet(), mtv_read_header(), new_audio_stream(), new_init_section(), new_output_stream(), new_video_stream(), open_output_file(), open_slave(), opengl_write_header(), opt_filter_complex(), opt_map(), opt_sdp_file(), opt_vstats_file(), parse_channel_expressions(), parse_device_name(), parse_filename(), parse_fmtp(), parse_frames(), parse_location(), parse_playlist(), parse_psfile(), parse_read_interval(), parse_read_intervals(), parse_set_cookie(), parse_source_list(), parse_speaker_pos(), parse_times(), parse_video_var(), plot_freqs(), process_command(), process_line(), pulse_add_detected_device(), pulse_server_info_cb(), qsv_decode_init(), qsv_enc_init(), read_header(), read_ttag(), realtext_read_header(), rtmp_http_open(), sami_paragraph_to_ass(), sap_read_header(), sdl2_write_header(), seg_init(), segment_end(), set_enable_expr(), set_expr(), set_options(), set_string(), show_help(), sls_flag_use_localtime_filename(), sls_flags_filename_process(), split_init(), start_children(), stream_open(), v4l2_get_device_list(), write_option(), X264_init(), xcbgrab_read_header(), and xv_write_header().
| char* av_strndup | ( | const char * | s, |
| size_t | len | ||
| ) |
Duplicate a substring of a string.
| s | String to be duplicated |
| len | Maximum length of the resulting string (not counting the terminating byte) |
s or NULL if the string cannot be allocated Definition at line 249 of file mem.c.
Referenced by avformat_match_stream_specifier(), mpjpeg_get_boundary(), and parse_cookie().
Duplicate a buffer with av_malloc().
| p | Buffer to be duplicated |
| size | Size in bytes of the buffer copied |
p or NULL if the buffer cannot be allocated Definition at line 269 of file mem.c.
Referenced by av_opt_copy(), clone_filter_formats(), ff_mpv_common_frame_size_change(), ff_mpv_common_init(), ff_stream_encode_params_copy(), and set_aes_arg().
Overlapping memcpy() implementation.
| dst | Destination buffer |
| back | Number of bytes back to start copying (i.e. the initial size of the overlapping window); must be > 0 |
| cnt | Number of bytes to copy; must be >= 0 |
cnt > back is valid, this will copy the bytes we just copied, thus creating a repeating pattern with a period length of back. Definition at line 400 of file mem.c.
Referenced by copy_backptr(), decode_dsw1(), decode_frame(), decode_tsw1(), ff_lzf_uncompress(), mszh_decomp(), residual_interp(), synth_block_fcb_acb(), unpack(), and xan_unpack().
1.8.6