Allow user to select audio codec when opening an audio device

av/container/core.pyi

@@ -1,4 +1,4 @@
-from enum import Flag
+from enum import Flag, IntEnum
 from fractions import Fraction
 from pathlib import Path
 from types import TracebackType
@@ -30,6 +30,43 @@ class Flags(Flag):
     shortest: ClassVar[Flags]
     auto_bsf: ClassVar[Flags]
 
+class AudioCodec(IntEnum):
+    none: int
+    pcm_alaw: int
+    pcm_bluray: int
+    pcm_dvd: int
+    pcm_f16le: int
+    pcm_f24le: int
+    pcm_f32be: int
+    pcm_f32le: int
+    pcm_f64be: int
+    pcm_f64le: int
+    pcm_lxf: int
+    pcm_mulaw: int
+    pcm_s16be: int
+    pcm_s16be_planar: int
+    pcm_s16le: int
+    pcm_s16le_planar: int
+    pcm_s24be: int
+    pcm_s24daud: int
+    pcm_s24le: int
+    pcm_s24le_planar: int
+    pcm_s32be: int
+    pcm_s32le: int
+    pcm_s32le_planar: int
+    pcm_s64be: int
+    pcm_s64le: int
+    pcm_s8: int
+    pcm_s8_planar: int
+    pcm_u16be: int
+    pcm_u16le: int
+    pcm_u24be: int
+    pcm_u24le: int
+    pcm_u32be: int
+    pcm_u32le: int
+    pcm_u8: int
+    pcm_vidc: int
+
 class Container:
     writeable: bool
     name: str

av/container/core.pyx

@@ -3,7 +3,7 @@ from libc.stdint cimport int64_t
 
 import os
 import time
-from enum import Flag
+from enum import Flag, IntEnum
 from pathlib import Path
 
 cimport libav as lib
@@ -141,6 +141,44 @@ class Flags(Flag):
     shortest: "Stop muxing when the shortest stream stops." = lib.AVFMT_FLAG_SHORTEST
     auto_bsf: "Add bitstream filters as requested by the muxer." = lib.AVFMT_FLAG_AUTO_BSF
 
+class AudioCodec(IntEnum):
+    """Enumeration for audio codec IDs."""
+    none = lib.AV_CODEC_ID_NONE  # No codec.
+    pcm_alaw = lib.AV_CODEC_ID_PCM_ALAW  # PCM A-law.
+    pcm_bluray = lib.AV_CODEC_ID_PCM_BLURAY  # PCM Blu-ray.
+    pcm_dvd = lib.AV_CODEC_ID_PCM_DVD  # PCM DVD.
+    pcm_f16le = lib.AV_CODEC_ID_PCM_F16LE  # PCM F16 little-endian.
+    pcm_f24le = lib.AV_CODEC_ID_PCM_F24LE  # PCM F24 little-endian.
+    pcm_f32be = lib.AV_CODEC_ID_PCM_F32BE  # PCM F32 big-endian.
+    pcm_f32le = lib.AV_CODEC_ID_PCM_F32LE  # PCM F32 little-endian.
+    pcm_f64be = lib.AV_CODEC_ID_PCM_F64BE  # PCM F64 big-endian.
+    pcm_f64le = lib.AV_CODEC_ID_PCM_F64LE  # PCM F64 little-endian.
+    pcm_lxf = lib.AV_CODEC_ID_PCM_LXF  # PCM LXF.
+    pcm_mulaw = lib.AV_CODEC_ID_PCM_MULAW  # PCM μ-law.
+    pcm_s16be = lib.AV_CODEC_ID_PCM_S16BE  # PCM signed 16-bit big-endian.
+    pcm_s16be_planar = lib.AV_CODEC_ID_PCM_S16BE_PLANAR  # PCM signed 16-bit big-endian planar.
+    pcm_s16le = lib.AV_CODEC_ID_PCM_S16LE  # PCM signed 16-bit little-endian.
+    pcm_s16le_planar = lib.AV_CODEC_ID_PCM_S16LE_PLANAR  # PCM signed 16-bit little-endian planar.
+    pcm_s24be = lib.AV_CODEC_ID_PCM_S24BE  # PCM signed 24-bit big-endian.
+    pcm_s24daud = lib.AV_CODEC_ID_PCM_S24DAUD  # PCM signed 24-bit D-Cinema audio.
+    pcm_s24le = lib.AV_CODEC_ID_PCM_S24LE  # PCM signed 24-bit little-endian.
+    pcm_s24le_planar = lib.AV_CODEC_ID_PCM_S24LE_PLANAR  # PCM signed 24-bit little-endian planar.
+    pcm_s32be = lib.AV_CODEC_ID_PCM_S32BE  # PCM signed 32-bit big-endian.
+    pcm_s32le = lib.AV_CODEC_ID_PCM_S32LE  # PCM signed 32-bit little-endian.
+    pcm_s32le_planar = lib.AV_CODEC_ID_PCM_S32LE_PLANAR  # PCM signed 32-bit little-endian planar.
+    pcm_s64be = lib.AV_CODEC_ID_PCM_S64BE  # PCM signed 64-bit big-endian.
+    pcm_s64le = lib.AV_CODEC_ID_PCM_S64LE  # PCM signed 64-bit little-endian.
+    pcm_s8 = lib.AV_CODEC_ID_PCM_S8  # PCM signed 8-bit.
+    pcm_s8_planar = lib.AV_CODEC_ID_PCM_S8_PLANAR  # PCM signed 8-bit planar.
+    pcm_u16be = lib.AV_CODEC_ID_PCM_U16BE  # PCM unsigned 16-bit big-endian.
+    pcm_u16le = lib.AV_CODEC_ID_PCM_U16LE  # PCM unsigned 16-bit little-endian.
+    pcm_u24be = lib.AV_CODEC_ID_PCM_U24BE  # PCM unsigned 24-bit big-endian.
+    pcm_u24le = lib.AV_CODEC_ID_PCM_U24LE  # PCM unsigned 24-bit little-endian.
+    pcm_u32be = lib.AV_CODEC_ID_PCM_U32BE  # PCM unsigned 32-bit big-endian.
+    pcm_u32le = lib.AV_CODEC_ID_PCM_U32LE  # PCM unsigned 32-bit little-endian.
+    pcm_u8 = lib.AV_CODEC_ID_PCM_U8  # PCM unsigned 8-bit.
+    pcm_vidc = lib.AV_CODEC_ID_PCM_VIDC  # PCM VIDC.
+
 
 cdef class Container:
     def __cinit__(self, sentinel, file_, format_name, options,
@@ -176,7 +214,10 @@ cdef class Container:
         self.buffer_size = buffer_size
         self.io_open = io_open
 
+        acodec = None  # no audio codec specified
         if format_name is not None:
+            if ":" in format_name:
+                format_name, acodec = format_name.split(":")
             self.format = ContainerFormat(format_name)
 
         self.input_was_opened = False
@@ -211,6 +252,9 @@ cdef class Container:
                 self.ptr.interrupt_callback.callback = interrupt_cb
                 self.ptr.interrupt_callback.opaque = &self.interrupt_callback_info
 
+            if acodec is not None:
+                self.ptr.audio_codec_id = getattr(AudioCodec, acodec)
+
         self.ptr.flags |= lib.AVFMT_FLAG_GENPTS
         self.ptr.opaque = <void*>self
 

include/libavcodec/avcodec.pxd

@@ -163,6 +163,40 @@ cdef extern from "libavcodec/avcodec.h" nogil:
         AV_CODEC_ID_NONE
         AV_CODEC_ID_MPEG2VIDEO
         AV_CODEC_ID_MPEG1VIDEO
+        AV_CODEC_ID_PCM_ALAW
+        AV_CODEC_ID_PCM_BLURAY
+        AV_CODEC_ID_PCM_DVD
+        AV_CODEC_ID_PCM_F16LE
+        AV_CODEC_ID_PCM_F24LE
+        AV_CODEC_ID_PCM_F32BE
+        AV_CODEC_ID_PCM_F32LE
+        AV_CODEC_ID_PCM_F64BE
+        AV_CODEC_ID_PCM_F64LE
+        AV_CODEC_ID_PCM_LXF
+        AV_CODEC_ID_PCM_MULAW
+        AV_CODEC_ID_PCM_S16BE
+        AV_CODEC_ID_PCM_S16BE_PLANAR
+        AV_CODEC_ID_PCM_S16LE
+        AV_CODEC_ID_PCM_S16LE_PLANAR
+        AV_CODEC_ID_PCM_S24BE
+        AV_CODEC_ID_PCM_S24DAUD
+        AV_CODEC_ID_PCM_S24LE
+        AV_CODEC_ID_PCM_S24LE_PLANAR
+        AV_CODEC_ID_PCM_S32BE
+        AV_CODEC_ID_PCM_S32LE
+        AV_CODEC_ID_PCM_S32LE_PLANAR
+        AV_CODEC_ID_PCM_S64BE
+        AV_CODEC_ID_PCM_S64LE
+        AV_CODEC_ID_PCM_S8
+        AV_CODEC_ID_PCM_S8_PLANAR
+        AV_CODEC_ID_PCM_U16BE
+        AV_CODEC_ID_PCM_U16LE
+        AV_CODEC_ID_PCM_U24BE
+        AV_CODEC_ID_PCM_U24LE
+        AV_CODEC_ID_PCM_U32BE
+        AV_CODEC_ID_PCM_U32LE
+        AV_CODEC_ID_PCM_U8
+        AV_CODEC_ID_PCM_VIDC
 
     cdef enum AVDiscard:
         AVDISCARD_NONE

include/libavformat/avformat.pxd

@@ -191,6 +191,7 @@ cdef extern from "libavformat/avformat.h" nogil:
         int flags
         int64_t max_analyze_duration
 
+        AVCodecID audio_codec_id
         void *opaque
 
         int (*io_open)(