Definition at line 504 of file avcodec.c.

Referenced by avformat_find_stream_info(), dump_stream_format(), and dump_stream_group().

Definition at line 74 of file avcodec.c.

Referenced by init_context_defaults(), and thread_execute().

Fill AVFrame audio data and linesize pointers.

The buffer buf must be a preallocated buffer with a size big enough to contain the specified samples amount. The filled AVFrame data pointers will point to this buffer.

AVFrame extended_data channel pointers are allocated if necessary for planar audio.

Parameters

frame the AVFrame frame->nb_samples must be set prior to calling the function. This function fills in frame->data, frame->extended_data, frame->linesize[0].

nb_channels channel count

sample_fmt sample format

buf buffer to use for frame data

buf_size size of buffer

align plane size sample alignment (0 = default)

Returns

>=0 on success, negative error code on failure

Todo:

return the size in bytes required to store the samples in case of success, at the next libavutil bump

Definition at line 366 of file utils.c.

Reset the internal codec state / flush internal buffers.

Should be called e.g. when seeking or when switching to a different stream.

Note

for decoders, this function just releases any references the decoder might keep internally, but the caller's references remain valid.

for encoders, this function will only do something if the encoder declares support for AV_CODEC_CAP_ENCODER_FLUSH. When called, the encoder will drain any remaining packets, and can then be reused for a different stream (as opposed to sending a null frame which will leave the encoder in a permanent EOF state after draining). This can be desirable if the cost of tearing down and replacing the encoder instance is high.

Definition at line 380 of file avcodec.c.

Referenced by compute_crc_of_packets(), decoder_decode_frame(), decoder_thread(), ff_thread_flush(), ftr_flush(), imm5_flush(), LLVMFuzzerTestOneInput(), process_command(), read_interval_packets(), and rewind_file().

Return audio frame duration.

Parameters

avctx codec context

frame_bytes size of the frame, or 0 if unknown

Returns

frame duration, in samples, if known. 0 if not able to determine.

Definition at line 803 of file utils.c.

Referenced by compute_frame_duration().

Same behaviour av_fast_malloc but the buffer has additional AV_INPUT_BUFFER_PADDING_SIZE at the end which will always be 0.

In addition the whole buffer will initially and after resizes be 0-initialized so that no uninitialized data will ever appear.

Definition at line 53 of file utils.c.

Referenced by allocate_buffers(), allocate_buffers2(), ape_decode_frame(), cdtoons_decode_frame(), cdxl_decode_frame(), cllc_decode_frame(), dcadec_decode_frame(), decode_block(), decode_frame(), decode_frame_lscr(), decode_huffman2(), decode_i_frame(), decode_idat_chunk(), decode_inter(), decode_inter_plane(), decode_intra(), decode_intra_plane(), decode_motion_vectors(), decode_mous(), decode_move(), decode_p_frame(), decode_zlib(), deinvert_buffer(), dwa_uncompress(), encode_frame(), encode_scanline_rle(), encode_scanline_zip(), ff_alloc_packet(), ff_dovi_rpu_generate(), ff_dovi_rpu_parse(), ff_mjpeg_find_marker(), ff_mpv_reallocate_putbitbuffer(), generate_fake_vps(), lead_decode_frame(), mimic_decode_frame(), mobiclip_decode(), mp_decode_frame(), mpc7_decode_frame(), parse_nal_units(), parse_object_segment(), raw_decode(), sga_decode_frame(), svq1_decode_frame(), svq3_decode_slice_header(), tiff_unpack_strip(), tqi_decode_frame(), utvideo_encode_frame(), wavpack_encode_block(), wavpack_encode_frame(), wv_stereo(), and xpm_decode_frame().

Same behaviour av_fast_padded_malloc except that buffer will always be 0-initialized after call.

Definition at line 66 of file utils.c.

Referenced by decode_idat_chunk(), encode_frame(), and init_buffers().

Returns

a positive value if s is open (i.e. avcodec_open2() was called on it), 0 otherwise.

Definition at line 703 of file avcodec.c.

Referenced by avcodec_open2(), avcodec_receive_frame(), avcodec_receive_packet(), avcodec_send_frame(), avcodec_send_packet(), avformat_find_stream_info(), ff_codec_close(), process_frame(), read_frame_internal(), and try_decode_frame().