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libretroadmin
f62d495d2d
A CHD was read through one decoded hunk and a thread that decoded one hunk ahead. A game that plays CD audio while it streams data reads the two from different places a sector at a time, so each threw out the other's hunk and aimed the thread away from it, and the hunks were decoded on the emulation thread: a stutter a GDI never shows. Each stream (data tracks, audio tracks) now reads through its own libretro-common vfs_prefetch, whose thread decodes the hunks ahead on an image handle of its own, one window per hunk; sectors are lent from the windows in place, and a read command's Prefetch() sets the data stream's thread going before the first sector is asked for. The core defines HAVE_THREADS where it builds threads, so the prefetcher is not compiled to stubs. tools/chd/chd_streams_test, run from tools/chd/run.sh and now in CI, reads audio and data at once and fails when the reading thread does the decoding.
51 lines
1.5 KiB
YAML
51 lines
1.5 KiB
YAML
name: CHD reading
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# tools/chd/run.sh: every frame of CHDs made with each CD codec, a GD-ROM
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# image and a parent chain against the files they came from; and CD audio
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# and data read at once through chd.cpp, where the read-ahead threads must
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# decode the hunks and neither stream throw out the other's (ASan + UBSan,
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# TSan).
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on:
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push:
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paths:
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- 'core/imgread/**'
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- 'core/deps/coreio/**'
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- 'core/archive/**'
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- 'core/libretro-common/formats/**'
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- 'core/libretro-common/encodings/**'
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- 'core/libretro-common/vfs/**'
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- 'core/libretro-common/streams/**'
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- 'core/libretro-common/rthreads/**'
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- 'tools/chd/**'
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- '.github/workflows/chd.yml'
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pull_request:
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paths:
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- 'core/imgread/**'
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- 'core/deps/coreio/**'
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- 'core/archive/**'
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- 'core/libretro-common/formats/**'
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- 'core/libretro-common/encodings/**'
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- 'core/libretro-common/vfs/**'
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- 'core/libretro-common/streams/**'
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- 'core/libretro-common/rthreads/**'
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- 'tools/chd/**'
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- '.github/workflows/chd.yml'
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workflow_dispatch:
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permissions:
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contents: read
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jobs:
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chd:
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runs-on: ubuntu-24.04
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timeout-minutes: 30
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steps:
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- uses: actions/checkout@v4
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- name: Install chdman
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run: |
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sudo apt-get update
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sudo apt-get install -y --no-install-recommends build-essential mame-tools python3
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- name: CHD reads, and CD audio and data at once
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run: sh tools/chd/run.sh
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