Support additional MP4 codecs (#1293, #1338)

mirror of https://github.com/taglib/taglib.git synced 2026-08-14 06:17:00 -04:00

Adds MP4::Properties::Codec enum values AC3, EAC3, FLAC, DTS, Opus and a
MP4::Properties::codecId() method.
Parse high-res FLAC bitrate from MP4 dfLa box.
Parse E-AC-3 bitrate from MP4 dec3 box.

The test files were generated using ffmpeg:

ffmpeg -hide_banner -y -f lavfi \
  -i "sine=frequency=440:sample_rate=48000:duration=1" \
  -c:a flac -ac 2 -flags +bitexact -fflags +bitexact \
  -metadata:s:a:0 encoder= -metadata encoder= \
  -f mp4 tests/data/flac.m4a

ffmpeg -hide_banner -y -f lavfi \
  -i "sine=frequency=440:sample_rate=48000:duration=1" \
  -c:a libopus -ac 2 -flags +bitexact -fflags +bitexact \
  -metadata:s:a:0 encoder= -metadata encoder= \
  -f mp4 tests/data/opus.m4a

ffmpeg -hide_banner -y -f lavfi \
  -i "sine=frequency=440:sample_rate=48000:duration=1" \
  -c:a ac3 -b:a 128k -ac 2 -strict experimental \
  -flags +bitexact -fflags +bitexact \
  -metadata:s:a:0 encoder= -metadata encoder= \
  -f mp4 tests/data/ac3.m4a

ffmpeg -hide_banner -y -f lavfi \
  -i "sine=frequency=440:sample_rate=48000:duration=1" \
  -c:a eac3 -b:a 128k -ac 2 -strict experimental \
  -flags +bitexact -fflags +bitexact \
  -metadata:s:a:0 encoder= -metadata encoder= \
  -f mp4 tests/data/eac3.m4a

ffmpeg -hide_banner -y -f lavfi \
  -i "sine=frequency=440:sample_rate=96000:duration=1" \
  -c:a flac -sample_fmt s32 -ac 2 -flags +bitexact -fflags +bitexact \
  -metadata:s:a:0 encoder= -metadata encoder= \
  -f mp4 tests/data/flac96.m4a

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