Function avcodec_send_packet

pub unsafe extern "C" fn avcodec_send_packet(
    avctx: *mut AVCodecContext,
    avpkt: *const AVPacket,
) -> i32

Supply raw packet data as input to a decoder.

Internally, this call will copy relevant AVCodecContext fields, which can influence decoding per-packet, and apply them when the packet is actually decoded. (For example AVCodecContext.skip_frame, which might direct the decoder to drop the frame contained by the packet sent with this function.)

@warning The input buffer, avpkt->data must be AV_INPUT_BUFFER_PADDING_SIZE larger than the actual read bytes because some optimized bitstream readers read 32 or 64 bits at once and could read over the end.

@note The AVCodecContext MUST have been opened with @ref avcodec_open2() before packets may be fed to the decoder.

@param avctx codec context @param[in] avpkt The input AVPacket. Usually, this will be a single video frame, or several complete audio frames. Ownership of the packet remains with the caller, and the decoder will not write to the packet. The decoder may create a reference to the packet data (or copy it if the packet is not reference-counted). Unlike with older APIs, the packet is always fully consumed, and if it contains multiple frames (e.g. some audio codecs), will require you to call avcodec_receive_frame() multiple times afterwards before you can send a new packet. It can be NULL (or an AVPacket with data set to NULL and size set to 0); in this case, it is considered a flush packet, which signals the end of the stream. Sending the first flush packet will return success. Subsequent ones are unnecessary and will return AVERROR_EOF. If the decoder still has frames buffered, it will return them after sending a flush packet.

@retval 0 success @retval AVERROR(EAGAIN) input is not accepted in the current state - user must read output with avcodec_receive_frame() (once all output is read, the packet should be resent, and the call will not fail with EAGAIN). @retval AVERROR_EOF the decoder has been flushed, and no new packets can be sent to it (also returned if more than 1 flush packet is sent) @retval AVERROR(EINVAL) codec not opened, it is an encoder, or requires flush @retval AVERROR(ENOMEM) failed to add packet to internal queue, or similar @retval “another negative error code” legitimate decoding errors