There's no reasonable expectation of privacy in a public setting.
That depends. In Texas, it's this: https://guides.sll.texas.gov/recording-laws/audio-recording
"Texas is considered a "one-party consent" state. This means that unless at least one of the parties to a conversation consents, both Texas and federal wiretapping laws make it a crime to record an audio conversation, either in person or over the phone, if the parties have a "reasonable expectation of privacy".
Courts have generally held that there may not be a reasonable expectation of privacy out in public, but the legality of a specific recording will depend on the circumstances. An attorney can advise you on the recording laws and how they may affect a recording you plan to make.
Below you will find links to Texas and federal laws related to audio recordings..."
https://www.criminaldefenselawyer.c...i-record-a-conversation-between-myself-anothe
"The U.S. and the states have their own laws governing the legality of surreptitious recording of oral, telephonic, and other communications. A person's secret taping of a conversation is governed by the laws of the state in which she is making the recording unless the federal law is more protective of privacy....
...The Wiretap Act (as well as each state law governing secret recording of conversations) protects only those communications that the individuals being secretly recorded reasonably expect to be private. Whether one has a reasonable expectation of privacy in a given situation depends upon the context: Was the conversation in a public or private location? Did the individual being recorded treat the subject matter as private? A person who is bragging at a party about cheating a friend in a business deal cannot later object to the introduction of a recording of this admission as evidence in a lawsuit filed by his ex-friend."