d37709b659
This reverts commit a9e0924fa7688c4e4558e179c6608ce1093e15f8. Reason for revert: Breaks because of RTC_LAST_SYSTEM_ERROR Original change's description: > Fix circular dependencies between optional, array_view, and rtc_base. > > This splits things out of rtc_base and makes dependencies explicit. > > Bug: webrtc:6828 > Change-Id: Ib813c7bd9e4de7ab015acb917bc09ee7204ba7bd > Reviewed-on: https://webrtc-review.googlesource.com/31940 > Commit-Queue: Patrik Höglund <phoglund@webrtc.org> > Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> > Cr-Commit-Position: refs/heads/master@{#21245} TBR=phoglund@webrtc.org,kwiberg@webrtc.org Change-Id: I1a5dcf2223f00ae7c46f9f2a12b990ab3a84397d No-Presubmit: true No-Tree-Checks: true No-Try: true Bug: webrtc:6828 Reviewed-on: https://webrtc-review.googlesource.com/32760 Reviewed-by: Patrik Höglund <phoglund@webrtc.org> Commit-Queue: Patrik Höglund <phoglund@webrtc.org> Cr-Commit-Position: refs/heads/master@{#21251}
Conversational Speech generator tool
Tool to generate multiple-end audio tracks to simulate conversational speech with two or more participants.
The input to the tool is a directory containing a number of audio tracks and a text file indicating how to time the sequence of speech turns (see the Example section).
Since the timing of the speaking turns is specified by the user, the generated tracks may not be suitable for testing scenarios in which there is unpredictable network delay (e.g., end-to-end RTC assessment).
Instead, the generated pairs can be used when the delay is constant (obviously including the case in which there is no delay). For instance, echo cancellation in the APM module can be evaluated using two-end audio tracks as input and reverse input.
By indicating negative and positive time offsets, one can reproduce cross-talk (aka double-talk) and silence in the conversation.
Example
For each end, there is a set of audio tracks, e.g., a1, a2 and a3 (speaker A) and b1, b2 (speaker B). The text file with the timing information may look like this:
A a1 0
B b1 0
A a2 100
B b2 -200
A a3 0
A a4 0
The first column indicates the speaker name, the second contains the audio track file names, and the third the offsets (in milliseconds) used to concatenate the chunks.
Assume that all the audio tracks in the example above are 1000 ms long. The tool will then generate two tracks (A and B) that look like this:
Track A
a1 (1000 ms)
silence (1100 ms)
a2 (1000 ms)
silence (800 ms)
a3 (1000 ms)
a4 (1000 ms)
Track B
silence (1000 ms)
b1 (1000 ms)
silence (900 ms)
b2 (1000 ms)
silence (2000 ms)
The two tracks can be also visualized as follows (one characheter represents 100 ms, "." is silence and "*" is speech).
t: 0 1 2 3 4 5 6 (s)
A: **********...........**********........********************
B: ..........**********.........**********....................
^ 200 ms cross-talk
100 ms silence ^